CN101693222A - Method for separating oolitic hematite - Google Patents
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- 229910052595 hematite Inorganic materials 0.000 title claims abstract description 40
- 239000011019 hematite Substances 0.000 title claims abstract description 40
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 33
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 82
- 229910052742 iron Inorganic materials 0.000 claims abstract description 41
- 239000012141 concentrate Substances 0.000 claims abstract description 30
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 24
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 22
- 238000005188 flotation Methods 0.000 claims abstract description 16
- 239000002253 acid Substances 0.000 claims abstract description 13
- 150000008051 alkyl sulfates Chemical class 0.000 claims abstract description 11
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 11
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 14
- NEAQRZUHTPSBBM-UHFFFAOYSA-N 2-hydroxy-3,3-dimethyl-7-nitro-4h-isoquinolin-1-one Chemical compound C1=C([N+]([O-])=O)C=C2C(=O)N(O)C(C)(C)CC2=C1 NEAQRZUHTPSBBM-UHFFFAOYSA-N 0.000 claims description 12
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 12
- 239000011707 mineral Substances 0.000 claims description 12
- 229910052698 phosphorus Inorganic materials 0.000 claims description 12
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 10
- 239000011574 phosphorus Substances 0.000 claims description 10
- 235000019353 potassium silicate Nutrition 0.000 claims description 10
- 238000010408 sweeping Methods 0.000 claims description 10
- 239000012190 activator Substances 0.000 claims description 7
- 229920000881 Modified starch Polymers 0.000 claims description 6
- 239000004368 Modified starch Substances 0.000 claims description 6
- 235000019426 modified starch Nutrition 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical group [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 5
- 239000001110 calcium chloride Substances 0.000 claims description 5
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 5
- 229920002472 Starch Polymers 0.000 claims description 4
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 claims description 4
- 239000006185 dispersion Substances 0.000 claims description 4
- 239000003112 inhibitor Substances 0.000 claims description 4
- 235000019698 starch Nutrition 0.000 claims description 4
- 239000008107 starch Substances 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 4
- 238000003672 processing method Methods 0.000 claims description 2
- 229910001608 iron mineral Inorganic materials 0.000 abstract description 7
- 238000007885 magnetic separation Methods 0.000 abstract description 7
- 238000000926 separation method Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000003795 chemical substances by application Substances 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000004115 Sodium Silicate Substances 0.000 abstract 1
- 239000002131 composite material Substances 0.000 abstract 1
- 230000007547 defect Effects 0.000 abstract 1
- 239000003814 drug Substances 0.000 abstract 1
- 229910052911 sodium silicate Inorganic materials 0.000 abstract 1
- 239000002734 clay mineral Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 4
- 239000010453 quartz Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000002000 scavenging effect Effects 0.000 description 3
- 229910021532 Calcite Inorganic materials 0.000 description 2
- FPOQLQZHRCEVOT-UHFFFAOYSA-N N-hydroxy-2-phenylacetamide Chemical compound ONC(=O)CC1=CC=CC=C1 FPOQLQZHRCEVOT-UHFFFAOYSA-N 0.000 description 2
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 2
- -1 alkyl sulfuric acid Chemical compound 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910001919 chlorite Inorganic materials 0.000 description 2
- 229910052619 chlorite group Inorganic materials 0.000 description 2
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 229910000514 dolomite Inorganic materials 0.000 description 2
- 239000010459 dolomite Substances 0.000 description 2
- 229910052622 kaolinite Inorganic materials 0.000 description 2
- CYPPCCJJKNISFK-UHFFFAOYSA-J kaolinite Chemical compound [OH-].[OH-].[OH-].[OH-].[Al+3].[Al+3].[O-][Si](=O)O[Si]([O-])=O CYPPCCJJKNISFK-UHFFFAOYSA-J 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 235000019333 sodium laurylsulphate Nutrition 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000005456 ore beneficiation Methods 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
技术领域technical field
本发明涉及一种选矿方法，特别涉及一种赤铁矿的选矿方法。The invention relates to a beneficiation method, in particular to a hematite ore beneficiation method.
背景技术Background technique
铁矿石作为一种不可再生的自然资源，再经过若干年的持续开采，富铁矿和易选的贫铁矿石会耗竭，取而代之的是大量“贫、细、杂、难磨和难选”的铁矿石。鲕状赤铁矿就是其中一种，鲕状赤铁矿是我国一种重要的沉积型铁矿，探明储量很大，主要分布在我国湖南、湖北、广西、贵州等地。由于铁矿物嵌布粒度细，要使其鲕核单体解离，需要进行细磨，矿石中伴生的大量黏土矿物在破碎磨矿过程中容易形成微细颗粒和次生矿泥，导致该铁矿石属于极难选矿石。Iron ore is a non-renewable natural resource. After several years of continuous mining, rich iron ore and easy-to-select poor iron ore will be exhausted, replaced by a large number of "poor, fine, miscellaneous, difficult to grind and difficult to select" " of iron ore. Oolitic hematite is one of them. Oolitic hematite is an important sedimentary iron ore in my country. It has a large proven reserve and is mainly distributed in Hunan, Hubei, Guangxi, Guizhou and other places in my country. Due to the fine particle size of the iron minerals, fine grinding is required to dissociate the oolitic nuclei. A large amount of clay minerals associated with the ore are likely to form fine particles and secondary slime during the crushing and grinding process, resulting in the iron Ore belongs to extremely difficult ore.
随着我国钢铁工业的快速发展，国内各钢铁企业对铁矿石的需求量迅速增长，使我国已经成为世界上最大的铁矿石进口国，这种局面在一定程度上引发了世界铁矿石价格的爆涨，对我国钢铁企业的发展产生了负面的影响。所以，为了充分利用国内资源，提高铁矿石的自给率，满足我国钢铁企业的迅速发展，贵州赫章鲕状赤铁矿因其储量较大，至今未被开发利用而受到关注，为此，对其进行研究开发利用具有重要意义。With the rapid development of my country's iron and steel industry, the demand for iron ore by various domestic iron and steel enterprises has grown rapidly, making my country the world's largest iron ore importer. The explosion of prices has had a negative impact on the development of my country's iron and steel enterprises. Therefore, in order to make full use of domestic resources, increase the self-sufficiency rate of iron ore, and meet the rapid development of my country's iron and steel enterprises, Guizhou Hezhang oolitic hematite has attracted attention because of its large reserves and has not been developed and utilized so far. For this reason, It is of great significance to research, develop and utilize it.
贵州赫章鲕状赤铁矿，矿石中铁矿物主要为赤铁矿，脉石矿物主要为石英、粘土矿物等，且有害元素磷的含量高，铁的嵌布粒度细，铁矿物与石英、粘土矿物等呈同心环状包裹体，形成鲕状结构。属于弱磁性铁矿石中极难选的一种矿石。Oolitic hematite in Hezhang, Guizhou, the iron minerals in the ore are mainly hematite, the gangue minerals are mainly quartz, clay minerals, etc., and the content of harmful element phosphorus is high, and the embedded particle size of iron is fine. Iron minerals and quartz, Clay minerals and other concentric ring-shaped inclusions form an oolitic structure. It is an ore that is extremely difficult to select among weak magnetic iron ores.
目前，对贵州赫章鲕状赤铁矿进行选矿工艺的研究较少。陈述文等人(陈述文 贵州赫章鲕状赤铁矿直接还原磁选试验研究《金属矿山》，1997年，第11期)对贵州赫章鲕状赤铁矿采用直接还原磁选工艺进行研究，研究结果表明：采用固定床或外加热流动床法可或获得较好的选别指标，但成本太高、而且污染环境题；王兢等人(王兢 鲕状赤铁矿浮选实验初步研究《矿冶工程》，2004年，24卷，第3期)对贵州赫章鲕状赤铁矿进行浮选试验初步研究，采用浮选工艺，重点考察磨矿细度、NaOH用量、十二胺用量、GF用量对浮选效果的影响，由于泥化严重，造成分选效果差，获得的指标不理想。综观上述研究工艺及成果来看，都没有很好解决贵州赫章鲕状赤铁矿的选矿难的问题，由于铁矿物的嵌布粒度细，需要进行细磨使其单体解离，矿石中伴生的大量黏土矿物在破碎磨矿过程中容易形成微细颗粒和次生矿泥，对分选过程中带来的严重影响。At present, there are few studies on the beneficiation process of Hezhang oolitic hematite in Guizhou. Chen Wen et al. (Chen Wen, Guizhou Hezhang Oolitic Hematite Direct Reduction Magnetic Separation Experimental Research "Metal Mine", 1997, No. 11) conducted a study on Guizhou Hezhang Oolitic Hematite Direct Reduction Magnetic Separation Technology , the results of the study show that: the use of fixed bed or external heating fluidized bed method can obtain better separation index, but the cost is too high, and it pollutes the environment; Wang Jing et al. Research "Mining and Metallurgy Engineering", 2004, Volume 24, Issue 3) conducted a preliminary study on the flotation test of Hezhang oolitic hematite in Guizhou, using flotation technology, focusing on the investigation of grinding fineness, NaOH dosage, twelve The effect of the amount of amine and GF on the flotation effect is that the separation effect is poor due to serious mudification, and the obtained indicators are not ideal. Looking at the above research techniques and results, none of them have solved the difficult problem of beneficiation of Hezhang oolitic hematite in Guizhou. Due to the fine particle size of the embedded iron minerals, fine grinding is required to dissociate the monomers, and the ore A large amount of clay minerals associated in the crushing and grinding process are easy to form fine particles and secondary slime, which has a serious impact on the separation process.
发明内容Contents of the invention
本发明所要解决的技术问题是，提供一种工艺流程简单、能耗小、成本低且产品指标好的贵州赫章鲕状赤铁矿提铁降磷的选矿工艺，为开发利用贵州赫章铁矿石资源提供可行性依据。The technical problem to be solved by the present invention is to provide a beneficiation process for increasing iron and reducing phosphorus from Guizhou Hezhang oolitic hematite with simple process flow, low energy consumption, low cost and good product index, which is useful for the development and utilization of Guizhou Hezhang iron Ore resources provide a basis for feasibility.
本发明的技术方案：本选矿方法按以下步骤进行：Technical scheme of the present invention: this mineral processing method is carried out according to the following steps:
(1)将破碎至粒度-2mm的贵州赫章鲕状赤铁矿用0.038mm的标准筛进行预先筛分，将粒度+0.038mm的磨至粒度-0.075mm占77.50％后与粒度-0.038mm的混合；(1) The Guizhou Hezhang oolitic hematite crushed to a particle size of -2mm is pre-screened with a 0.038mm standard sieve, and the particle size +0.038mm is ground to a particle size of -0.075mm, accounting for 77.50%, and the particle size is -0.038mm the mix of;
(2)将步骤(1)得到的赤铁矿进行一次强磁粗选，磁场强度为1432.39KA/m～1671.98KA/m，得到强磁粗精矿和强磁粗尾矿；将强磁粗精矿磨至粒度-0.038mm占84.00％后进行一次强磁精选，磁场强度为1512.74KA/m～1671.98KA/m，得强磁精矿和精选尾矿；将强磁粗尾矿进行一次强磁扫选，磁场强度为1512.74KA/m～1671.98KA/m，得扫选精矿和废渣；将精选尾矿和扫选精矿返回步骤(1)的筛分工序；(2) the hematite obtained in step (1) is subjected to a strong magnetic roughing, and the magnetic field intensity is 1432.39KA/m～1671.98KA/m, to obtain strong magnetic coarse concentrate and strong magnetic tailings; After the concentrate is ground to a particle size of -0.038mm, accounting for 84.00%, a strong magnetic concentration is carried out, and the magnetic field strength is 1512.74KA/m～1671.98KA/m to obtain strong magnetic concentrate and concentrated tailings; A strong magnetic sweeping, with a magnetic field strength of 1512.74KA/m to 1671.98KA/m, to obtain sweeping concentrate and waste residue; returning the selected tailings and sweeping concentrate to the screening process of step (1);
(3)采用反浮选对强磁精矿进行提铁降磷：加入分散调整剂1000g/t～2000g/t，调整pH值至9～12，加入活化剂650g/t～1000g/t，加入赤铁矿抑制剂改性淀粉1000g/t～1400g/t，最后加入捕收剂250g/t～400g/t进行反浮选。(3) Use reverse flotation to extract iron and reduce phosphorus in strong magnetic concentrate: add dispersion regulator 1000g/t-2000g/t, adjust pH value to 9-12, add activator 650g/t-1000g/t, add Hematite inhibitor modified starch 1000g/t~1400g/t, finally add collector 250g/t~400g/t for reverse flotation.
上述的分散调整剂为碳酸钠和水玻璃的混合物；按质量计，碳酸钠与水玻璃的配比是3～6∶1。The above-mentioned dispersing regulator is a mixture of sodium carbonate and water glass; the ratio of sodium carbonate and water glass is 3-6:1 by mass.
所述的步骤(3)中，调整pH值使用的是氢氧化钠。In the described step (3), sodium hydroxide was used to adjust the pH value.
所述的活化剂是氯化钙。Described activator is calcium chloride.
所述的改性淀粉为羧甲基淀粉。The modified starch is carboxymethyl starch.
所述的捕收剂为羟肟酸和烷基硫酸盐的混合物；按质量计，羟肟酸和烷基硫酸盐的配比是2∶1。The collector is a mixture of hydroxamic acid and alkyl sulfate; by mass, the ratio of hydroxamic acid and alkyl sulfate is 2:1.
所述的步骤(2)中，强磁粗选使用的磁介质为棒介质。In the step (2), the magnetic medium used in the strong magnetic rough separation is a rod medium.
所述的步骤(2)中，强磁精选和强磁扫选使用的磁介质为网介质。In the step (2), the magnetic medium used in the strong magnetic selection and strong magnetic scanning is a net medium.
与现有技术相比，本发明方法取消了常用的焙烧工序，采用阶段磨矿、高梯度强磁选阴离子反浮选的物理选矿联合工艺处理贵州赫章鲕状赤铁矿。强磁粗选的目的是预先抛除部分尾矿、降低磨矿成本及减轻过磨泥化现象。强磁粗精矿进行再磨再选的目的是有利于提高铁的品位和回收率。强磁粗尾矿进行再选的目的是降低铁在尾矿中的损失。碳酸钠、水玻璃和氢氧化钠的组合使用，不仅起到调节pH值的作用，还起到分散矿浆中黏土矿物及软化水的作用。活化剂氯化钙起到活化石英类硅酸盐矿物的作用。捕收剂采用羟肟酸和烷基硫酸盐类的组合药剂，提高了捕收剂对铁矿物的捕收能力及选择性。本发明针对的矿石中主要含铁矿物为赤铁矿，属于弱磁性矿物，且铁的嵌布粒度细，将矿石进行阶段磨矿，阶段选别的强磁选抛尾，然后将强磁精矿采用反浮选进行提铁降磷，强磁选不仅起到富集铁矿物的作用，还起到脱泥的作用，减少矿泥对浮选的影响；高效调整剂采用碳酸钠，水玻璃和氢氧化钠的组合使用，捕收剂采用羟肟酸和烷基硫酸盐类的组合药剂，是反浮选进一步提高铁的品位的关键技术。Compared with the prior art, the method of the present invention cancels the commonly used roasting process, and adopts a physical beneficiation combined process of stage grinding and high-gradient strong magnetic separation anion reverse flotation to process Guizhou Hezhang oolitic hematite. The purpose of strong magnetic roughing is to remove part of the tailings in advance, reduce the cost of grinding and reduce the phenomenon of over-grinding mud. The purpose of regrinding and re-election of strong magnetic coarse concentrate is to improve the grade and recovery rate of iron. The purpose of re-selection of strong magnetic thick tailings is to reduce the loss of iron in the tailings. The combined use of sodium carbonate, water glass and sodium hydroxide not only plays the role of adjusting the pH value, but also plays the role of dispersing clay minerals in the pulp and softening water. The activator calcium chloride acts to activate the quartz-like silicate mineral. The collector uses a combination of hydroxamic acid and alkyl sulfate, which improves the collector's ability and selectivity for iron minerals. The main iron-containing mineral in the ore targeted by the present invention is hematite, which belongs to weak magnetic minerals, and the embedded particle size of iron is fine. The ore is subjected to stage grinding, stage separation, strong magnetic separation and tailing, and then the strong magnetic Concentrate adopts reverse flotation to extract iron and reduce phosphorus. Strong magnetic separation not only plays the role of enriching iron minerals, but also plays the role of desliming, reducing the impact of ore slime on flotation; the high-efficiency regulator uses sodium carbonate, The combined use of water glass and sodium hydroxide, and the combination of hydroxamic acid and alkyl sulfate as collectors are the key technologies for reverse flotation to further improve the grade of iron.
本发明具有如下优点：The present invention has the following advantages:
(1)具有较为经济的选矿成本，阶段磨矿可抛除部分尾矿，减轻过磨带来的金属铁损失。(1) It has a relatively economical beneficiation cost. Stage grinding can remove part of the tailings and reduce the loss of metallic iron caused by over-grinding.
(2)选别作业适用于不均匀嵌布的贫赤铁矿，在磨矿粒度不等的矿物颗粒均存在解离的条件，该工艺实现了粗细分级并进行粗粒级选别和细粒级选别的有效果组合，具有经济上合理和技术上可行的特点。(2) The sorting operation is suitable for poor hematite with uneven distribution. There are conditions for dissociation of mineral particles with different grinding particle sizes. The effective combination of grade selection is economically reasonable and technically feasible.
(3)最终获得的产品铁品位为56.14％～56.72％、磷的含量为0.20％～0.22％、铁回收率为62.06％～63.48％，属于四级铁精矿产品。(3) The iron grade of the finally obtained product is 56.14%-56.72%, the phosphorus content is 0.20%-0.22%, and the iron recovery rate is 62.06%-63.48%, which belongs to the fourth-grade iron concentrate product.
具体实施方式Detailed ways
本发明的实施例1：取部分贵州赫章鲕状赤铁矿，其主要化学成分是：TFe为45.56％，FeO为1.52％，P为0.63％，S为0.26％，SiO2为15.28％，Al2O3为9.34％，CaO为0.93％，MgO为1.24％。矿物组成为：主要含铁矿物为赤铁矿，脉石矿物主要为石英，其次为绿泥石、高岭石、白云石、方解石和胶磷矿等。Embodiment 1 of the present invention: get part of Guizhou Hezhang oolitic hematite, its main chemical composition is: TFe is 45.56%, FeO is 1.52%, P is 0.63%, S is 0.26%, SiO is 15.28%, Al2O3 is 9.34 %, CaO is 0.93%, and MgO is 1.24%. The mineral composition is as follows: the main iron-containing mineral is hematite, the gangue mineral is mainly quartz, followed by chlorite, kaolinite, dolomite, calcite and collophanite.
称取破碎至-2mm的原矿300g倒在0.038mm的标准筛上进行预先筛分，将+0.038mm的矿样经过磨矿至-0.075mm占77.50％，然后将-0.038 mm的矿样与经磨矿后的矿样混合，混合后在磁场强度为1671.98KA/m和磁介质为棒介质的条件下进行一次强磁粗选，得到强磁粗精矿和强磁粗尾矿；将强磁粗精矿磨至粒度-0.038mm占84.00％后进行一次强磁精选，磁场强度为1512.74KA/m、磁介质为网介质，得强磁精矿和精选尾矿；将强磁粗尾矿在磁场强度为1512.74KA/m和磁介质为网介质的条件下进行一次强磁扫选，得扫选精矿和废渣；将精选尾矿和扫选精矿返回最开始的筛分工序。然后将获得的强磁精矿采用反浮选进行提铁降磷，加入碳酸钠和水玻璃的混合物(按质量计碳酸钠与水玻璃的配比是6∶1)作为分散调整剂1000g/t，加入氢氧化钠调整pH值至9～12，加入活化剂氯化钙650g/t，加入赤铁矿抑制剂改性淀粉(羧甲基淀粉)1200g/t，加入羟肟酸和烷基硫酸盐类的组合药剂(按质量计，羟肟酸和烷基硫酸盐类的配比是2∶1，羟肟酸使用苯甲羟肟酸，烷基硫酸盐类用十二烷基硫酸钠)作为捕收剂300g/t，最终获得了铁品位为56.72％、磷的含量为0.21％、铁回收率为62.06％的四级铁精矿产品。Weigh 300g of raw ore crushed to -2mm and pour it on a 0.038mm standard sieve for pre-screening, grind the +0.038mm ore sample to -0.075mm to account for 77.50%, and then mix the -0.038 mm ore sample with the The ore samples after grinding are mixed, and after mixing, a strong magnetic roughing is carried out under the condition that the magnetic field strength is 1671.98KA/m and the magnetic medium is a rod medium to obtain strong magnetic coarse concentrate and strong magnetic tailings; Grind the coarse concentrate until the particle size is -0.038mm, accounting for 84.00%, and then perform a strong magnetic concentration, the magnetic field strength is 1512.74KA/m, the magnetic medium is a mesh medium, and the strong magnetic concentrate and the concentrated tailings are obtained; the strong magnetic thick tailings Under the condition that the magnetic field strength is 1512.74KA/m and the magnetic medium is a mesh medium, a strong magnetic scavenging is carried out to obtain the scavenging concentrate and waste residue; the selected tailings and scavenging concentrate are returned to the initial screening process . Then the obtained strong magnetic concentrate is carried out by reverse flotation to extract iron and reduce phosphorus, and add a mixture of sodium carbonate and water glass (the ratio of sodium carbonate and water glass is 6:1 by mass) as a dispersion regulator 1000g/t , add sodium hydroxide to adjust the pH value to 9-12, add activator calcium chloride 650g/t, add hematite inhibitor modified starch (carboxymethyl starch) 1200g/t, add hydroxamic acid and alkyl sulfuric acid Combination agents of salts (by mass, the ratio of hydroxamic acid and alkyl sulfates is 2:1, use benzyl hydroxamic acid for hydroxamic acid, and sodium lauryl sulfate for alkyl sulfates) As a collector of 300g/t, a fourth-grade iron ore concentrate product with an iron grade of 56.72%, a phosphorus content of 0.21%, and an iron recovery rate of 62.06% was finally obtained.
本发明的实施例2：取部分贵州赫章鲕状赤铁矿，其主要化学成分是：TFe为45.79％，FeO为1.47％，P为0.65％，S为0.25％，SiO2为14.98％，Al2O3为9.64％，CaO为0.86％，MgO为1.35％。矿物组成为：主要含铁矿物为赤铁矿，脉石矿物主要为石英，其次为绿泥石、高岭石、白云石、方解石和胶磷矿等。Embodiment 2 of the present invention: get part of Guizhou Hezhang oolitic hematite, its main chemical composition is: TFe is 45.79%, FeO is 1.47%, P is 0.65%, S is 0.25%, SiO is 14.98%, Al2O3 is 9.64 %, CaO is 0.86%, and MgO is 1.35%. The mineral composition is as follows: the main iron-containing mineral is hematite, the gangue mineral is mainly quartz, followed by chlorite, kaolinite, dolomite, calcite and collophanite.
称取破碎至-2mm的原矿300g倒在0.038mm的标准筛上进行预先筛分，将+0.038mm的矿样经过磨矿至-0.075mm占77.50％，然后将-0.038mm的矿样与经磨矿后的矿样混合，混合后在磁场强度为1512.74KA/m和磁介质为棒介质的条件下进行一次强磁粗选，得到强磁粗精矿和强磁粗尾矿；将强磁粗精矿磨至粒度-0.038mm占84.00％后进行一次强磁精选，磁场强度为1671.98KA/m、磁介质为网介质，得强磁精矿和精选尾矿；将强磁粗尾矿在磁场强度为1671.98KA/m和磁介质为网介质的条件下进行一次强磁扫选，得扫选精矿和废渣；将精选尾矿和扫选精矿返回最开始的筛分工序。然后将获得的强磁精矿采用反浮选进行提铁降磷，加入碳酸钠和水玻璃的混合物(按质量计碳酸钠与水玻璃的配比是3∶1)作为分散调整剂2000g/t，加入氢氧化钠调整pH值至9～12，加入活化剂氯化钙800g/t，加入赤铁矿抑制剂改性淀粉(羧甲基淀粉)1400g/t，加入羟肟酸和烷基硫酸盐类的组合药剂(按质量计，羟肟酸和烷基硫酸盐类的配比是2∶1，羟肟酸使用苯甲羟肟酸，烷基硫酸盐类使用十二烷基硫酸钠)作为捕收剂400g/t，最终获得了铁品位为56.14％、磷的含量为0.22％、铁回收率为63.48％的四级铁精矿产品。Weigh 300g of raw ore crushed to -2mm and pour it on a 0.038mm standard sieve for pre-screening, grind the +0.038mm ore sample to -0.075mm to account for 77.50%, and then mix the -0.038mm ore sample with the The ore samples after grinding are mixed, and after mixing, a strong magnetic roughing is carried out under the condition that the magnetic field strength is 1512.74KA/m and the magnetic medium is a rod medium to obtain strong magnetic coarse concentrate and strong magnetic tailings; Grind the coarse concentrate until the particle size is -0.038mm, accounting for 84.00%, and then perform a strong magnetic concentration. The magnetic field strength is 1671.98KA/m, and the magnetic medium is a mesh medium to obtain strong magnetic concentrate and concentrated tailings; Under the condition that the magnetic field strength is 1671.98KA/m and the magnetic medium is a mesh medium, the ore is subjected to a strong magnetic sweeping to obtain the sweeping concentrate and waste residue; the selected tailings and sweeping concentrate are returned to the initial screening process . Then the obtained strong magnetic concentrate is carried out by reverse flotation to extract iron and reduce phosphorus, and add a mixture of sodium carbonate and water glass (the ratio of sodium carbonate and water glass is 3:1 by mass) as a dispersion regulator 2000g/t , add sodium hydroxide to adjust the pH value to 9-12, add activator calcium chloride 800g/t, add hematite inhibitor modified starch (carboxymethyl starch) 1400g/t, add hydroxamic acid and alkyl sulfuric acid Combination agents of salts (by mass, the ratio of hydroxamic acid and alkyl sulfates is 2:1, hydroxamic acid uses benzyl hydroxamic acid, and alkyl sulfates use sodium dodecyl sulfate) As a collector of 400g/t, a fourth-grade iron ore concentrate product with an iron grade of 56.14%, a phosphorus content of 0.22%, and an iron recovery rate of 63.48% was finally obtained.
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