CN107399748A - A kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite - Google Patents
A kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/14—Magnesium hydroxide
- C01F5/16—Magnesium hydroxide by treating magnesia, e.g. calcined dolomite, with water or solutions of salts not containing magnesium
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- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
- C01F11/181—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by control of the carbonation conditions
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- C01F5/00—Compounds of magnesium
- C01F5/14—Magnesium hydroxide
- C01F5/20—Magnesium hydroxide by precipitation from solutions of magnesium salts with ammonia
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- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
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Abstract
The present invention relates to a kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite, belong to new chemical materialses technical field.A kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite, including following steps：(1) light dolomite powder is prepared；(2) light dolomite powder and the ammonium salt aqueous solution mixing obtained step (1) is imported in reactor, ammonia still process reaction is carried out under 80~105 DEG C and 200~1000r/min stir speed (S.S.)s, obtain ammonia still process liquid through filtering after reaction 0.5~4 hour, and by air and liquid mixer by the Ammonia recovery steamed in ammonia tank；(3) magnesium hydroxide is prepared；(4) calcium carbonate is prepared.
Description
Technical field
The present invention relates to a kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite, belong to new chemical materialses
Technical field.
Background technology
Magnesium hydroxide is a kind of inorganic additive flame retardant, and its heat decomposition temperature is up to 350 DEG C, more inorganic than currently used
Fire retardant aluminium hydroxide is higher by 140 DEG C, and the synthetic material of addition magnesium hydroxide can be made to bear higher processing temperature, beneficial to adding
Fast extrusion molding speed, shortens molding cycle, while be favorably improved flame retarding efficiency.Because its have low cigarette, nontoxic, heat endurance is good,
The advantages that cheap, at home and abroad by increasingly extensive use.
High-quality magnesium hydroxide is prepared at present mainly using impurity content is few, content of magnesium is high magnesite, bittern as raw material to enter
Row production, and seldom use dolomite.Because although dolomite reserves are big, distribution is wide, its Main Ingredients and Appearance is MgCO3·CaCO3
And silica, wherein magnesium, calcium content are close to 1:1, so when producing high-quality magnesium hydroxide with dolomite, it is necessary to first remove calcium
Go.Generally first by dolomite calcination, then digested, be carbonized, calcium composition is separated off, obtains basic magnesium carbonate, is entered
And again, alkalization obtains magnesium hydroxide after calcining, and this method process is cumbersome, and magnesium recovery rate is relatively low, and energy consumption is big, and easily causes environment
Pollution, and be used for preparing magnesia more.
The problem of in order to improve high-efficiency environment friendly energy-conservation that dolomite utilizes, the present invention use circulation ammonia process using dolomite to be former
Material is prepared for the new production process of high-purity type or fire retardant type magnesium hydroxide and calcium carbonate (such as threadiness), the production process
Simply, low for equipment requirements, production cost is low, easily operated, and energy-saving is consumed, and realizes high-performance magnesium hydroxide and calcium carbonate
The coproduction of high value added product, dolomite have obtained efficient utilization.
The content of the invention
Goal of the invention：The present invention has made improvements in view of the above-mentioned problems of the prior art, i.e., the invention discloses one kind
The production method of magnesium hydroxide and calcium carbonate is extracted from dolomite, this method is in the condition without using auxiliary agents such as surfactants
Under can produce high-purity type magnesium hydroxide (purity>98.5%) with calcium carbonate (as threadiness).The production method is led to by dolomite
Cross ammonia, carbon dioxide recycle method prepares magnesium hydroxide and calcium carbonate new technology, and this method production cost is low, and process is simple
It is easy to industrialized production, economic and environment-friendly, product surcharge is high, dolomite resources is efficiently utilized.
Technical scheme：A kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite, including following step
Suddenly：
(1) light dolomite powder is prepared
(11) dolomite is added in ball mill after crushing and crosses 50~800 eye mesh screens, obtain dolomite dust；
(12) by dolomite dust as in Muffle furnace, and calcined 1~6 hour at 750~1000 DEG C and obtain light-burned white clouds
Stone flour, and caused carbon dioxide is recovered in carbon dioxide storage tank by air and liquid mixer；
(2) ammonia still process is reacted
Light dolomite powder and the ammonium salt aqueous solution mixing that step (1) is obtained are imported in reactor, at 80~105 DEG C and
Ammonia still process reaction is carried out under 200~1000r/min stir speed (S.S.)s, obtains ammonia still process liquid through filtering after reacting 0.5~4 hour, and pass through
Air and liquid mixer by the Ammonia recovery steamed in ammonia tank, wherein：
The ratio of magnesium calcium ion sum and ammonium ion is 1 in light dolomite powder:(2~8)；
(3) magnesium hydroxide is prepared
(31) the ammonia still process liquid for obtaining step (2) is imported in the bubble type reactor of belt stirrer, is passed through step (2) and is obtained
Ammonia form middle interstitial fluid, then react 2~10 hours and obtain at 200~1000r/min stir speed (S.S.)s, 40~180 DEG C again
Reaction solution, wherein：
Ammonium salt and magnesium ion ratio in middle interstitial fluid are (1~100):1；
(32) by the reaction solution of filter press filtration step (31), solid product and filtrate are obtained, solid product is washed,
After drying process, that is, obtain high-purity type magnesium hydroxide or fire retardant type magnesium hydroxide；
(4) calcium carbonate is prepared
(41) in the reactor that the filtrate lead-in zone for obtaining step (32) stirs, it is passed through excessive step (12) recovery
Carbon dioxide, and react 0.5~3h at 100r/min~1000r/min stir speed (S.S.)s, 40~130 DEG C and reacted
Liquid；
(42) reaction solution obtained by filter press filtration step (41), obtains solid product and filtrate, by solid product
After washing, drying process, that is, obtain calcium carbonate.
Further, magnesium ion concentration is 0.5~1.3molL in the ammonia still process liquid of step (2)-1。
Further, calcium ion concentration is 0.5~2.0molL in the ammonia still process liquid of step (2)-1。
Further, the filtrate obtained in step (32) and step (42) can be as the ammonium salt aqueous solution ginseng in step (2)
Reacted with ammonia still process.
Further, the air and liquid mixer in step (12) and step (2) is jet pump.
Further, the high-purity type magnesium hydroxide obtained in step (32) is the magnesium hydroxide that purity is higher than 98.5wt%.
Further, the fire retardant type magnesium hydroxide obtained in step (32) is hexagonal flake fire retardant type magnesium hydroxide.
Further, the ammonium salt aqueous solution in step (2) is that aqueous ammonium nitrate solution, aqueous ammonium chloride solution, ammonium sulfate are water-soluble
One kind in liquid, ammonium acetate aqueous solution.
Beneficial effect：A kind of magnesium hydroxide and the production method of calcium carbonate of being extracted from dolomite disclosed by the invention has
Following beneficial effect：
1st, dolomite is used as raw material, and magnesium in dolomite and calcium can be efficiently extracted and except de-iron, two through ammonia still process reaction
The impurity such as silica, magnesium sinking reaction can both obtain high-performance magnesium hydroxide, can realize the separation of magnesium calcium, ammonia, dioxy again
Change carbon, which can reach, to be recycled, and technological process is short, simple to operate, CR production；
2nd, ammonia still process solution is passed directly into by way of bubbling with carbon dioxide and is filtered with magnesium sinking using bubbling reactor, ammonia
Liquid, so as to the macroscopical and microcosmic mixed effect of optimizing reaction system；
3rd, obtained magnesium hydroxide products particle crystal formation rule is full, homogeneous and good dispersion, and specific surface area is 5~
8m2·g-1, better than the 10m of industrial requirements2·g-1, product particle even particle size distribution (narrow distribution range), average grain diameter D50Can
Between 0.5-5 μm, the largest particles particle diameter is less than 7.0 μm for control；
4th, react in relatively mild temperature (magnesium sinking reacts 40~180 DEG C, and the calcium that sinks reacts 40-130 DEG C) and pressure (in 1MPa
Experiment is completed under the conditions of below), without playing the auxiliary agent (such as surfactant) of regulation product crystal formation and dispersiveness, operating procedure letter
Single, required equipment is easily realized and floor space is few, and can be good at controlling powder diameter distribution and crystal formation.In course of reaction
In without using surfactant, so as to lower the environmental pollution of production cost and the external world.
5th, the recyclable carbon dioxide of course of reaction, ammonium salt, ammonia realize that it is recycled, and further increase the technique
Economic benefit, reduce pollutant emission.
6th, the technique that the present invention develops being capable of synthesized high-performance fire retardant type magnesium hydroxide product and fibrous calcium carbonate crystalline substance
Must, simple to operate, required equipment requirement is not high, and equipment investment expense is low, recycles accessory substance, suitable for commercial scale metaplasia
Production.
Brief description of the drawings
Fig. 1 is to be prepared by a kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite disclosed by the invention
Magnesium hydroxide particle SEM figure；
Fig. 2 is to be prepared by a kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite disclosed by the invention
Magnesium hydroxide particle size distribution figure；
Fig. 3 is to be prepared by a kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite disclosed by the invention
Magnesium hydroxide particle XRD
Fig. 4 is to be prepared by a kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite disclosed by the invention
Calcium carbonate granule XRD；
Fig. 5 is to be prepared by a kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite disclosed by the invention
Calcium carbonate granule SEM figure.
Embodiment：
The embodiment of the present invention is described in detail below.
Specific embodiment 1
A kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite, including following steps：
(1) light dolomite powder is prepared
(11) dolomite is added in ball mill after crushing and crosses 50 eye mesh screens, obtain dolomite dust；
(12) by dolomite dust as in Muffle furnace, and calcined 6 hours at 750 DEG C and obtain light dolomite powder, and led to
Cross air and liquid mixer caused carbon dioxide is recovered in carbon dioxide storage tank；
(2) ammonia still process is reacted
Light dolomite powder and the ammonium salt aqueous solution mixing that step (1) is obtained are imported in reactor, at 80 DEG C and
Ammonia still process reaction is carried out under 1000r/min stir speed (S.S.)s, obtains ammonia still process liquid through filtering after reacting 0.5 hour, and pass through gas-liquid mixed
Device by the Ammonia recovery steamed in ammonia tank, wherein：
The ratio of magnesium calcium ion sum and ammonium ion is 1 in light dolomite powder:2；
(3) magnesium hydroxide is prepared
(31) the ammonia still process liquid for obtaining step (2) is imported in the bubble type reactor of belt stirrer, is passed through step (2) and is obtained
Ammonia form middle interstitial fluid, then reacted 10 hours at 200r/min stir speed (S.S.)s, 40 DEG C again and obtain reaction solution, wherein：
Ammonium salt and magnesium ion ratio in middle interstitial fluid are 1:1；
The SEM of the magnesium hydroxide of preparation schemes as shown in figure 1, the grain size distribution of the magnesium hydroxide prepared is as shown in Fig. 2 system
The XRD of standby magnesium hydroxide is as shown in Figure 3；
(32) by the reaction solution of filter press filtration step (31), solid product and filtrate are obtained, solid product is washed,
After drying process, that is, obtain high-purity type magnesium hydroxide；
(4) calcium carbonate is prepared
(41) in the reactor that the filtrate lead-in zone for obtaining step (32) stirs, it is passed through excessive step (12) recovery
Carbon dioxide, and react 3h at 100r/min stir speed (S.S.)s, 40 DEG C and obtain reaction solution；
(42) reaction solution obtained by filter press filtration step (41), obtains solid product and filtrate, by solid product
After washing, drying process, that is, obtain calcium carbonate.
The SEM figures and XRD of the calcium carbonate of preparation are as shown in Figure 4 and Figure 5.
Its main chemical reactions equation is as follows：
The calcining of dolomite：
Ammonia still process is reacted：
Magnesium sinking is reacted：MgR+NH3+H2O→Mg(OH)2↓+NH4R
Heavy calcium reaction：CaR+CO2+NH3→CaCO3↓+NH4R
Wherein, NH4R represents ammonium salt, ammonium nitrate, ammonium chloride, ammonium sulfate, ammonium acetate.
Further, magnesium ion concentration is 0.5molL in the ammonia still process liquid of step (2)-1。
Further, calcium ion concentration is 0.5molL in the ammonia still process liquid of step (2)-1。
Further, the air and liquid mixer in step (12) and step (2) is jet pump.
Further, the high-purity type magnesium hydroxide obtained in step (32) is the magnesium hydroxide that purity is higher than 98.5wt%.
Further, the ammonium salt aqueous solution in step (2) is aqueous ammonium nitrate solution.
Specific embodiment 2
Roughly the same with specific embodiment 1, differing only in the filtrate obtained in step (32) and step (42) can make
Ammonia still process reaction is participated in for the ammonium salt aqueous solution in step (2).
Specific embodiment 3
A kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite, including following steps：
(1) light dolomite powder is prepared
(11) dolomite is added in ball mill after crushing and crosses 800 eye mesh screens, obtain dolomite dust；
(12) by dolomite dust as in Muffle furnace, and calcined 1 hour at 1000 DEG C and obtain light dolomite powder, and led to
Cross air and liquid mixer caused carbon dioxide is recovered in carbon dioxide storage tank；
(2) ammonia still process is reacted
Light dolomite powder and the ammonium salt aqueous solution mixing that step (1) is obtained are imported in reactor, at 105 DEG C and
Ammonia still process reaction is carried out under 200r/min stir speed (S.S.)s, ammonia still process liquid is obtained through filtering after reacting 4 hours, and will by air and liquid mixer
The Ammonia recovery steamed in ammonia tank, wherein：
The ratio of magnesium calcium ion sum and ammonium ion is 1 in light dolomite powder:8；
(3) magnesium hydroxide is prepared
(31) the ammonia still process liquid for obtaining step (2) is imported in the bubble type reactor of belt stirrer, is passed through step (2) and is obtained
Ammonia form middle interstitial fluid, then reacted 2 hours at 1000r/min stir speed (S.S.)s, 180 DEG C again and obtain reaction solution, wherein：
Ammonium salt and magnesium ion ratio in middle interstitial fluid are 100:1；
(32) by the reaction solution of filter press filtration step (31), solid product and filtrate are obtained, solid product is washed,
After drying process, that is, obtain fire retardant type magnesium hydroxide；
(4) calcium carbonate is prepared
(41) in the reactor that the filtrate lead-in zone for obtaining step (32) stirs, it is passed through excessive step (12) recovery
Carbon dioxide, and react 0.5h at 1000r/min stir speed (S.S.)s, 130 DEG C and obtain reaction solution；
(42) reaction solution obtained by filter press filtration step (41), obtains solid product and filtrate, by solid product
After washing, drying process, that is, obtain calcium carbonate.
Further, magnesium ion concentration is 1.3molL in the ammonia still process liquid of step (2)-1。
Further, calcium ion concentration is 2.0molL in the ammonia still process liquid of step (2)-1。
Further, the air and liquid mixer in step (12) and step (2) is jet pump.
Further, the fire retardant type magnesium hydroxide obtained in step (32) is hexagonal flake fire retardant type magnesium hydroxide.
Further, the ammonium salt aqueous solution in step (2) is aqueous ammonium chloride solution.
Specific embodiment 4
It is roughly the same with specific embodiment 3, differ only in：The filtrate obtained in step (32) and step (42) can be made
Ammonia still process reaction is participated in for the ammonium salt aqueous solution in step (2).
Specific embodiment 5
A kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite, including following steps：
(1) light dolomite powder is prepared
(11) dolomite is added in ball mill after crushing and crosses 200 eye mesh screens, obtain dolomite dust；
(12) by dolomite dust as in Muffle furnace, and calcined 3 hours at 850 DEG C and obtain light dolomite powder, and led to
Cross air and liquid mixer caused carbon dioxide is recovered in carbon dioxide storage tank；
(2) ammonia still process is reacted
Light dolomite powder and the ammonium salt aqueous solution mixing that step (1) is obtained are imported in reactor, in 95 DEG C and 600r/
Ammonia still process reaction is carried out under min stir speed (S.S.)s, obtains ammonia still process liquid through filtering after reacting 2 hours, and will steam by air and liquid mixer
Ammonia recovery in ammonia tank, wherein：
The ratio of magnesium calcium ion sum and ammonium ion is 1 in light dolomite powder:5；
(3) magnesium hydroxide is prepared
(31) the ammonia still process liquid for obtaining step (2) is imported in the bubble type reactor of belt stirrer, is passed through step (2) and is obtained
Ammonia form middle interstitial fluid, then reacted 6 hours at 600r/min stir speed (S.S.)s, 120 DEG C again and obtain reaction solution, wherein：
Ammonium salt and magnesium ion ratio in middle interstitial fluid are 50:1；
(32) by the reaction solution of filter press filtration step (31), solid product and filtrate are obtained, solid product is washed,
After drying process, that is, obtain fire retardant type magnesium hydroxide；
(4) calcium carbonate is prepared
(41) in the reactor that the filtrate lead-in zone for obtaining step (32) stirs, it is passed through excessive step (12) recovery
Carbon dioxide, and react 2h at 500r/min stir speed (S.S.)s, 90 DEG C and obtain reaction solution；
(42) reaction solution obtained by filter press filtration step (41), obtains solid product and filtrate, by solid product
After washing, drying process, that is, obtain calcium carbonate.
Further, magnesium ion concentration is 1molL in the ammonia still process liquid of step (2)-1。
Further, calcium ion concentration is 1molL in the ammonia still process liquid of step (2)-1。
Further, the air and liquid mixer in step (12) and step (2) is jet pump.
Further, the fire retardant type magnesium hydroxide obtained in step (32) is hexagonal flake fire retardant type magnesium hydroxide.
Further, the ammonium salt aqueous solution in step (2) is ammonium sulfate solution.
Specific embodiment 6
Remaining specific embodiment 5 is roughly the same, differs only in：Ammonium salt aqueous solution in step (2) is water-soluble for ammonium acetate
Liquid.
Specific embodiment 7
Remaining specific embodiment 5 is roughly the same, differs only in：The filtrate obtained in step (32) and step (42) can be made
Ammonia still process reaction is participated in for the ammonium salt aqueous solution in step (2).
Embodiments of the present invention are elaborated above.But the present invention is not limited to above-mentioned embodiment,
In art those of ordinary skill's possessed knowledge, it can also be done on the premise of present inventive concept is not departed from
Go out various change.
Claims (8)
1. a kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite, it is characterised in that including following step
Suddenly：
(1) light dolomite powder is prepared
(11) dolomite is added in ball mill after crushing and crosses 50~800 eye mesh screens, obtain dolomite dust；
(12) by dolomite dust as in Muffle furnace, and calcined 1~6 hour at 750~1000 DEG C and obtain light dolomite powder,
And caused carbon dioxide is recovered in carbon dioxide storage tank by air and liquid mixer；
(2) ammonia still process is reacted
Light dolomite powder and the ammonium salt aqueous solution mixing that step (1) is obtained are imported in reactor, at 80~105 DEG C and 200
Ammonia still process reaction is carried out under~1000r/min stir speed (S.S.)s, obtains ammonia still process liquid through filtering after reacting 0.5~4 hour, and pass through gas-liquid
Blender by the Ammonia recovery steamed in ammonia tank, wherein：
The ratio of magnesium calcium ion sum and ammonium ion is 1 in light dolomite powder:(2~8)；
(3) magnesium hydroxide is prepared
(31) the ammonia still process liquid for obtaining step (2) is imported in the bubble type reactor of belt stirrer, is passed through the ammonia that step (2) obtains
Gas forms middle interstitial fluid, then reacts 2~10 hours and is reacted at 200~1000r/min stir speed (S.S.)s, 40~180 DEG C again
Liquid, wherein：
Ammonium salt and magnesium ion ratio in middle interstitial fluid are (1~100):1；
(32) by the reaction solution of filter press filtration step (31), solid product and filtrate are obtained, solid product is washed, dried
After processing, that is, obtain high-purity type magnesium hydroxide or fire retardant type magnesium hydroxide；
(4) calcium carbonate is prepared
(41) in the reactor that the filtrate lead-in zone for obtaining step (32) stirs, it is passed through the dioxy of excessive step (12) recovery
Change carbon gas, and react 0.5~3h at 100r/min~1000r/min stir speed (S.S.)s, 40~130 DEG C and obtain reaction solution；
(42) reaction solution obtained by filter press filtration step (41), obtains solid product and filtrate, solid product is washed,
After drying process, that is, obtain calcium carbonate.
2. a kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite according to claim 1, its feature
It is, magnesium ion concentration is 0.5~1.3molL in the ammonia still process liquid of step (2)-1。
3. a kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite according to claim 1, its feature
It is, calcium ion concentration is 0.5~2.0molL in the ammonia still process liquid of step (2)-1。
4. a kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite according to claim 1, its feature
It is, the filtrate obtained in step (32) and step (42) can participate in ammonia still process reaction as the ammonium salt aqueous solution in step (2).
5. a kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite according to claim 1, its feature
It is, the air and liquid mixer in step (12) and step (2) is jet pump.
6. a kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite according to claim 1, its feature
It is, the high-purity type magnesium hydroxide obtained in step (32) is the magnesium hydroxide that purity is higher than 98.5wt%.
7. a kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite according to claim 1, its feature
It is, the fire retardant type magnesium hydroxide obtained in step (32) is hexagonal flake fire retardant type magnesium hydroxide.
8. a kind of production method that magnesium hydroxide and calcium carbonate are extracted from dolomite according to claim 1, its feature
It is, the ammonium salt aqueous solution in step (2) is that aqueous ammonium nitrate solution, aqueous ammonium chloride solution, ammonium sulfate solution, ammonium acetate are water-soluble
One kind in liquid.
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Cited By (6)
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| CN107935014A (en) * | 2017-12-08 | 2018-04-20 | 沈阳化工大学 | A kind of ammonium salt dissolving and circulation ammonia process extract the production method of calcium carbonate from calcite |
| CN108821303A (en) * | 2018-07-13 | 2018-11-16 | 大连地拓环境科技有限公司 | A kind of method of magnesium and boron mineral |
| CN109354050A (en) * | 2018-10-24 | 2019-02-19 | 沈阳辰兴化工技术有限公司 | A kind of method and device preparing calcium carbonate and magnesium hydroxide using dolomite |
| CN109574049A (en) * | 2019-01-23 | 2019-04-05 | 大连海事大学 | A kind of magnesium hydroxide slurry aquation synthetic method that molten speed is controllable |
| CN111549239A (en) * | 2019-02-08 | 2020-08-18 | 北京中金瑞丰环保科技有限公司 | Resourceful treatment method of magnesium-containing raw material |
| CN112778662A (en) * | 2020-12-30 | 2021-05-11 | 界首市旭升塑胶制品有限公司 | Process for improving performance of PVC rain shoes by using calcium carbonate whiskers |
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| CN107935014A (en) * | 2017-12-08 | 2018-04-20 | 沈阳化工大学 | A kind of ammonium salt dissolving and circulation ammonia process extract the production method of calcium carbonate from calcite |
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| CN108821303B (en) * | 2018-07-13 | 2021-07-20 | 大连地拓环境科技有限公司 | Comprehensive utilization method of boric sludge |
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| CN109574049A (en) * | 2019-01-23 | 2019-04-05 | 大连海事大学 | A kind of magnesium hydroxide slurry aquation synthetic method that molten speed is controllable |
| CN111549239A (en) * | 2019-02-08 | 2020-08-18 | 北京中金瑞丰环保科技有限公司 | Resourceful treatment method of magnesium-containing raw material |
| CN111549239B (en) * | 2019-02-08 | 2022-04-22 | 北京中金瑞丰环保科技有限公司 | Resourceful treatment method of magnesium-containing raw material |
| CN112778662A (en) * | 2020-12-30 | 2021-05-11 | 界首市旭升塑胶制品有限公司 | Process for improving performance of PVC rain shoes by using calcium carbonate whiskers |
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