CN104492615A - Grinding classification method - Google Patents
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Abstract
The invention belongs to the field of ore pulp classification, relates to a grinding classification method, and concretely relates to a method for performing classification by utilizing a waterpower swirler. The to-be solved technological problem is that in order to guarantee the granularity of ore pulp subjected to grinding classification to reach product quality requirements, the grinding classification method comprises the following steps: A, inputting ore pulp needing classification operation into a first-stage swirler for classification; B, enabling classified overflow ore pulp in the first-stage swirler to enter a static-pressure box; C, enabling ore pulp in the static-pressure box to automatically flow into a second-stage swirler depending on the height difference with the second-stage swirler; D, collecting overflow ore pulp subjected to classification in the second-stage swirler, so as to obtain mineral with targeted grinded particle level; and E, regrinding underflow settled sand in the first-stage swireler and in the second-stage swireler, and then again sending into the first-stage swirler for classification. Finally, the mineral with the target particle level is obtained by utilizing the two stages of swirlers for classification.
Description
Technical field
The invention belongs to ore pulp classification field, the present invention relates to a kind of grind grading method, be specifically related to adopt hydraulic vortex flow devices to carry out the method for classification.
Background technology
At present, in Mineral Processing Industry, various metals mineral are after gathering, owing to needing to dissociate to metalliferous mineral wherein and gangue, therefore all need by entering ball mill and a certain proportion of water yield of annotating carries out wet grinding in subsequent production processing, make mineral reach certain particle size, then by hierarchy system, the separation of products reaching certain mass requirement granularity is out entered down one manufacturing procedure.In classification process, hydrocyclone is used widely.
Hydrocyclone is as a kind of classifying equipoment, grinding classification system is formed with ball mill in closed circuit grinding technique, replace spiral classifier, high frequency vibrating fine screen or other classifying equipoments, there is structure simple and safeguard facility, energy free consumption, feature that classification efficiency is high, thus make it be able to all can be applied in each stage ore dressing classification process of various mineral.But because Mineral Dressing Process link is more, output can not be constant in a numerical value, thus make current hydrocyclone can stability contorting by feeding pressure, feedstock concentrations and granularity, often there is the situations such as pressure change, change in concentration, thus often causing a part of raw granulate fraction can enter into cyclone overflow causes race thick, and fine grain particle part can enter underflow to cause underflow to press from both sides thin, thus reduce classification efficiency.Therefore, for guaranteeing that the pulp granularity after classification can reach product quality requirement, the combination that generally have employed " one-level cyclone+high frequency vibrating fine screen+magnetic separation dehydration " carries out closed circuit grinding classification to the ore pulp after ore grinding, the product granularity of the classification to guarantee and the quality of follow-up magnetic separation of iron ore concentrate product.But adopt this grinding grading technique to there is following subject matter: 1. classification efficiency is low, the matter efficiency of general classification is within 25%; 2. timely and effective adjustment partition size can not be changed according to raw ore, to guarantee the quality of magnetic separation of iron ore concentrate product; As original ore property change, the vibrating screen mesh that granularity can only change different pore size need be adjusted; 3. system processing power is little, and the new ore grinding amount of system process only can reach 45t/ (platform .h); 4. hierarchy system is complicated, has the facility such as cyclone, dehydration magnetic separator, vibratory sieve, demagnetizer; 5. spare part and consumption of materials large.
Under this application background, the present inventor provides a kind of employing " one-level cyclone+plenum chamber+second cyclone " completely newly to carry out the method for grind grading.
Summary of the invention
Technical problem solved by the invention is for guaranteeing that the pulp granularity after grind grading can reach product quality requirement, the invention provides a kind of grind grading method adopting hydraulic vortex flow devices to carry out classification.
Grind grading method of the present invention comprises the following steps:
A, the ore pulp of graded operation will be needed to input one-level cyclone carry out classification;
Overflow pulp in B, one-level cyclone after classification enters plenum chamber;
In C, plenum chamber, ore pulp relies on to flow automatically with the discrepancy in elevation of second cyclone and enters second cyclone;
The ore pulp of overflow after D, second cyclone classification, obtains the mineral of target ore grinding grade;
The underflow sand setting of E, one-level cyclone and second cyclone is regrinded through grinding attachment, again inputs one-level cyclone and carries out being classified to the mineral obtaining target grade.
Finally, the present invention utilizes two-stage cyclones to carry out classification, obtains the mineral of target grade.
In technique scheme, steps A ore pulp enters one-level cyclone, can utilize the dynamic pressure that the positive discrepancy in elevation of ore slurry transportation pipeline and one-level cyclone produces, or relies on raising of pump to send dynamic pressure to make ore pulp enter one-level cyclone.The ore pulp entering one-level cyclone, due to the factor of miner's skill, therefore there will be pressure, flow velocity, the multiple change of concentration, and ore pulp amount only need be made to keep cyclone minimum treat ability, and usual pulp density remains on 30-70%.
In technique scheme, because there being different grade requirements to product, second cyclone can be the building form of a cluster cyclone.
In technique scheme, because there being different grade requirements to product, the quantity of second cyclone and large I mineral grade as required and disposal ability arrange and are less than one-level cyclone unit, make it to reach required granularity.
In technique scheme, form the pressure (pressure) of suitable second cyclone needs for meeting the slurry entering second cyclone, the pressure between plenum chamber and second cyclone has certain discrepancy in elevation.The discrepancy in elevation can calculate according to slurry density, liquid pressure etc. and obtain.Generally, the discrepancy in elevation is according to following formulae discovery: h=P/ (pg)
In formula:
H represents the discrepancy in elevation, and unit is m;
P express liquid pressure, unit is Pa;
P express liquid density, unit is kilograms per cubic meter (kg/m
3);
G represents 9.8N/kg (under normal circumstances desirable g=10N/kg).
When the mineral quantity entering one-level cyclone classification larger or less time, suitably can be adjusted to the cyclone adapting to its disposal ability, second cyclone also should select disposal ability and the quantity of second cyclone according to the overflow pulp amount of one-level cyclone and required product granularity.
For applicant place vanadium titano-magnetite ore dressing industry, the target mineral grade arranged according to inventor is greater than 75% for-200 order grade mass ratioes, and disposal ability is about 300m
3the requirement of/h, in technique scheme, the slurry concentration of ore pulp described in steps A is 30-70% ,-200 order mineral contents more than 20%, and described cyclone is 1 Φ 660 ~ 710mm cyclone (preferred Φ 660mm cyclone).The ore pulp pressure entering second cyclone group is 0.12MP-0.15MP, and described cyclone is 1 group 12 Φ 250 ~ 350mm cyclones (preferred Φ 350mm cyclones).After second cyclone component level, its effluent concentration is more than 15% ,-200 order content is more than 75%, reaches the product granularity that applicant needs.
The innovative point of grind grading method of the present invention is:
1) grind grading method of the present invention utilizes " the one-level cyclone+plenum chamber+second cyclone " of centrifugal force hydraulic classiciation to carry out classification to mineral, replaces " one-level cyclone+high frequency vibrating fine screen+magnetic separation dehydration " stage division relying on mechanical grading classification.
2) entering one-level cyclone ore pulp is dynamic pressure, enters second cyclone ore pulp for stablize static pressure, makes that the ore pulp classification efficiency entering second cyclone is higher, steady quality.
3) the underflow sand setting of one-level cyclone and second cyclone need not dewater, and directly enters grinding attachment and regrinds.
4) by regulating the operation number of second cyclone, quick adjustment can feed the feed force of cyclone, the granularity of second cyclone overflow mineral is controlled rapidly, without the need to changing cyclone.
5) one-level cyclone can suitably be accelerated, for the input ore pulp after special disposal one-level cyclone and the fine grinding of second cyclone underflow.
In grind grading method of the present invention, one-level cyclone is that dynamic pressure is to ore deposit to ore deposit, the overflow of one-level cyclone carries out a point ore deposit by entering second cyclone after plenum chamber again, because plenum chamber and second cyclone keep fixed position, it is hereby ensured that the slurry pressure entering second cyclone keeps stable.Generally, enter one-level cyclone and adopt gravity flow feed force comparatively to use transport pump pressure more stable, be more conducive to cyclone classification parameter and keep stable.
The beneficial effect of grind grading method of the present invention is as follows:
1) technological process is simple, adopts cyclone+plenum chamber+cyclone combination to carry out classification, cancels dehydration magnetic separator, vibratory sieve, demagnetizer etc., be convenient to safeguard.
2) existing employing cyclone+vibratory sieve skills classification matter efficiency is 25%, and second cyclone classification matter efficiency of the present invention brings up to more than 39%, and more existing employing cyclone+vibratory sieve technology improves 14%.
3) separate unit grinding attachment (as MQG3660 type ball mill) grinding capacity brings up to more than 76.8t/h by 54.7t/h, comparatively adopts cyclone+vibratory sieve+dehydration magnetic separator technology to improve more than 40%.And product granularity is stabilized in more than 75%, there will not be because of screen cloth use for a long time after break or sieve aperture increase cause product granularity cannot be stabilized in about 75% situation.
4) cyclone have volume little, be easy to safeguard, classification efficiency high, more original technique compares unregulated power and spare unit consumption, cost-saving.
Explanation of nouns:
Classification efficiency (E) refers to the percentage of same grade weight in the weight of a certain rank in Grading Overflow and grader feed.It is the index of examination grader work quality.
Classification matter efficiency calculates with following formula usually.E＝100(β-α)(α-θ)÷[α(100-α)(β-θ)]×100％
α: the content being less than certain grade in feed;
β: the content being less than certain grade in overflow product;
θ: the content being less than certain grade in sand setting.
Accompanying drawing explanation
Fig. 1 is grind grading method equipment drawing of the present invention.
Detailed description of the invention
The detailed description of the invention of form by the following examples, is described in further detail foregoing of the present invention again, illustrates but does not limit the present invention.
Former technique correlation circumstance, need account for more than 75% for target mineral grade for-200 orders.
The original classification flow process of application person ironworker's section is: the ore discharge of ball mill and a stages of magnetic separation concentrate mix by transport pump to one-level cyclone, cyclone overflow is sieved through high frequency fine screen, screenings is directly selected to two, three stages of magnetic separation as certified products, oversize is again through dehydration magnetic separation, concentrate and one section of hydrocyclone sand mixing of dehydration magnetic separation return ball mill, and the mine tailing of dehydration magnetic separation is drained.Productions examination through 2012 and 2013 proves, this flow process is feasible to selecting the classification of iron, but along with the increase of output, in flow process, produced problem gets more and more, and mainly there is following problem:
1, to there is classification efficiency low for original flow process medium-high frequency dusting cover, and the shortcoming of screenings-200 order content instability.2012 and 2013, the ruuning situation of applicant to former 14#, 15#, 16# ball grinder graded system medium-high frequency dusting cover carried out repeatedly examining or check, and carried out Macro or mass analysis to examination result, the results are shown in Table-1:
Table-1
By learning three billiard ball mill hierarchy systems, 2012 and 2013 2 years examination results, the classification efficiency average index of high frequency fine screen is 24.97%, and screenings-200 order content average index is 69.43%.Therefore, high frequency fine screen was at run duration in 2012 and 2013, and classification efficiency is lower, and screenings-200 order content is also unstable.And the operation principle of high frequency fine screen causes its classification efficiency can reduce on the contrary along with the increase of its disposal ability: within 2012, iron ore concentrate output is 780,000 tons, and classification efficiency is 27.32%; And 2013 annual productions are 1,250,000 tons, classification efficiency is 22.62%.
2, after output increases, the plant area of installing high frequency fine screen need be increased.By measuring, the ore deposit amount of a high frequency vibrating fine screen screenings, for about 20 tons per hour, as production capacity increases, then needs the mounting platform increasing high frequency vibrating fine screen.The occupation of land of a high frequency vibrating fine screen is 5.9 × 1.8m, at least will stay the gap of 1 meter, therefore, meet the needs of expanding production, then need to extend existing factory building between two high frequency fine screens.
3, spare part and consumption of materials large.Especially for the screen cloth of high frequency vibrating fine screen, a slice price reaches thousands of unit, and the operating period is only about three months, and a high frequency vibrating fine screen once replacing amount can reach 10.
After adopting grind grading method of the present invention, need more than 75% be accounted for for target mineral grade for-200 orders.
(granularity-200 order accounts for about 30% to one section of concentrate, 360t/h) directly carry out classification by the Cemented filling of certain distance and the discrepancy in elevation to one-level 2 Φ 660mm cyclones, effluent concentration after one-level cyclone classification and granularity are respectively about 45%, underflow sand setting concentration about 75%; Cyclone overflow enters a plenum chamber, the a cluster cyclone of one group 12 is entered by bottom part pipe, need more than 75% be accounted for for product needed granularity-200 order, then all on average enter 10 Φ 250mm cyclone classifications (as-200 orders need account for more than 65% time, then enter 2 Φ 350mm cyclones and 8 Φ 250mm cyclones respectively).After second cyclone classification, effluent concentration is generally at 15-20%, and underflow density about 75% ,-200 orders are about 20-25%.
Two-stage cyclones underflow converges and enters ball mill and regrind, and be transported to another Φ 660mm cyclone through mine-discharging terminal Pulp pump, its overflow imports plenum chamber, again distributes to each second cyclone group and carries out classification.
Verified by the operational effect of nearly year to second cyclone, my the examination result of company's milling system is comprehensively analyzed, and contrasts with the operational effect of high frequency fine screen, the results are shown in Table-2.
Table-2
Known by the overall target of examination, high frequency fine screen and second cyclone is used to carry out control classification, in classification matter efficiency, second cyclone classification matter efficiency is 38.60%, high frequency fine screen classification matter efficiency then only has 24.97%, and second cyclone exceeds 13.63 percentage points than the classification matter efficiency of high frequency fine screen; In partition size, to when in ore deposit ,-200 order content are suitable,-200 order content of second cyclone overflow are 81.91%, and screenings-200 order of high frequency fine screen then only has 69.42%, and in the overflow of second cyclone ,-200 order content exceed 12.49 percentage points than high frequency fine screen screenings; In graded product concentration, second cyclone effluent concentration is 23.60%, and the concentration of high frequency fine screen screenings is just up to 44.30%, second cyclone effluent concentration is obviously low 20.70 percentage points, the overflow of second cyclone is used to enter two stages of magnetic separation, its feed ore concentration is suitable for, and uses the screenings of high frequency fine screen, just needs to add back-flushing to ore deposit place at two stages of magnetic separation; In the amount of classification finished product ore deposit, second cyclone overflow ore deposit amount per hourly can reach 76.80 tons, and high frequency fine screen screenings is per hour only has 54.70 tons, and second cyclone overflow is more per hour than the screenings of high frequency fine screen has more 20.1 tons.
Economic benefit
1, reduce because production capacity increases the high frequency vibrating fine screen and dehydration magnetic plant buying expenses needing to install, save 680,000 yuan/platform cover.
And after using two-stage cyclones classification, each series only needs to install a cluster cyclone be made up of 10 Φ 250 and 2 Φ 350 cyclones, probable cost is 380,000 yuan.
2, screen cloth expense buying expenses is saved.
Every platform high frequency shale shaker has 10 screen clothes, often opens screen cloth 4200 yuan, and the life cycle of screen cloth is 3 to 4 months, within 1 year, changes screen cloth by 3 times and calculates: 10 × 4200 × 3=12.6 ten thousand yuan.
3, power cost saving.After changing second cyclone classification into, following power consumption can be cancelled:
3.1, every platform high frequency vibrating fine screen has 2 bobbing machines, the power of every platform bobbing machine is 2.5kw, and within 1 year, by 300 days, the electricity charge were by 0.55 yuan of calculating: 2 × 2.5 × 24 × 300 × 0.55=1.98 ten thousand yuan.
3.2, the magnetic separator power of motor that dewaters is 11kw, and within 1 year, by 300 days, 0.55 yuan of calculating was pressed in the electricity charge, 11 × 24 × 300 × 0.55=4.36 ten thousand yuan.
When 3.3, using high frequency shale shaker, one section of cyclone need run two pumps, after making a cluster cyclone into, only needs operation pump just can meet need of production.A pump motor power is 220kw, and within 1 year, by 300 days, 0.55 yuan of calculating was pressed in the electricity charge, 220 × 24 × 300 × 0.55=87.12 ten thousand yuan.
Claims (10)
1. grind grading method, is characterized in that: comprise the following steps:
A, the ore pulp of graded operation will be needed to input one-level cyclone carry out classification;
Overflow pulp in B, one-level cyclone after classification enters plenum chamber;
In C, plenum chamber, ore pulp relies on to flow automatically with the discrepancy in elevation of second cyclone and enters second cyclone;
The ore pulp of overflow after D, second cyclone classification, obtains the mineral of target ore grinding grade;
The underflow sand setting of E, one-level cyclone and second cyclone is regrinded through grinding attachment, again inputs one-level cyclone and carries out being classified to the mineral obtaining target grade.
2. grind grading method according to claim 1, is characterized in that: steps A ore pulp enters the dynamic pressure that one-level cyclone utilizes the positive discrepancy in elevation of the cyclone of ore slurry transportation pipeline and one-level eddy flow operation to produce makes ore pulp enter one-level cyclone; Or
Raising of pump is relied on to send dynamic pressure to make ore pulp enter the cyclone of one-level.
3. grind grading method according to claim 1, is characterized in that: the positive discrepancy in elevation account form of plenum chamber and second cyclone:
The discrepancy in elevation is according to following formulae discovery:
h＝P/(pg)
In formula:
H represents the discrepancy in elevation, and unit is m;
P express liquid pressure, unit is Pa;
P express liquid density, unit is kg/m
3;
G is in 9.8N/kg or 10N/kg.
4. grind grading method according to claim 1, is characterized in that: target mineral grade is-200 orders, and the ore pulp slurry concentration that steps A uses is 30-70% ,-200 order content more than 20%.
5. grind grading method according to claim 4, is characterized in that: step D is after second cyclone classification, and effluent concentration is more than 15% ,-200 order content is more than 75%.
6. grind grading method according to claim 4, is characterized in that: plenum chamber and the second cyclone discrepancy in elevation are 9-15m, and entering second cyclone pressure is 0.12MP-0.15MP.
7. grind grading method according to claim 4, is characterized in that: step D target ore grinding grade is the grade that mineral grade reaches-200 order grade mass ratioes and is greater than 75%.
8. grind grading method according to claim 4, is characterized in that: the quantity of one-level cyclone is at least 1, the quantity of the cyclone in secondary eddy flow operation is at least 8.
9. grind grading method according to claim 4, is characterized in that: described one-level cyclone is 660 ~ 710mm; Described second cyclone is Φ 250 ~ 350mm cyclone;
Preferably, described one-level cyclone is Φ 660mm cyclone; Described second cyclone is Φ 250mm cyclone or Φ 350mm cyclone.
10. grind grading method according to claim 8 or claim 9, is characterized in that: the quantity cyclone of the cyclone in described one-level eddy flow operation is Φ 660mm cyclone 1; The cyclone of described secondary eddy flow operation is Φ 350mm cyclone 12.
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Cited By (6)
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|---|---|---|---|---|
| CN105903555A (en) * | 2016-04-14 | 2016-08-31 | 山东鑫海矿业技术装备股份有限公司 | Tailings dry-type deslagging method employing swirlers in combination |
| CN106191458A (en) * | 2016-07-08 | 2016-12-07 | 中信重工机械股份有限公司 | A kind of process reclaiming coarse gold in grinding circuit in advance |
| CN108686840A (en) * | 2018-05-17 | 2018-10-23 | 伽师县铜辉矿业有限责任公司 | A kind of processing method before ore mill for more than clay content |
| CN109759223A (en) * | 2019-01-02 | 2019-05-17 | 浙江天磨矿业科技有限公司 | A kind of milling method improving the lepidolite rate of recovery |
| CN111530605A (en) * | 2020-05-13 | 2020-08-14 | 玉溪师范学院 | Ore grinding method for improving lepidolite recovery rate |
| WO2021203752A1 (en) * | 2020-04-08 | 2021-10-14 | 云南磷化集团有限公司 | Method for improving grinding and classification capacity by reducing sand deposition fineness ratio value |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105903555A (en) * | 2016-04-14 | 2016-08-31 | 山东鑫海矿业技术装备股份有限公司 | Tailings dry-type deslagging method employing swirlers in combination |
| CN106191458A (en) * | 2016-07-08 | 2016-12-07 | 中信重工机械股份有限公司 | A kind of process reclaiming coarse gold in grinding circuit in advance |
| CN108686840A (en) * | 2018-05-17 | 2018-10-23 | 伽师县铜辉矿业有限责任公司 | A kind of processing method before ore mill for more than clay content |
| CN108686840B (en) * | 2018-05-17 | 2020-04-24 | 伽师县铜辉矿业有限责任公司 | Treatment method for ore with high mud content before grinding |
| CN109759223A (en) * | 2019-01-02 | 2019-05-17 | 浙江天磨矿业科技有限公司 | A kind of milling method improving the lepidolite rate of recovery |
| WO2021203752A1 (en) * | 2020-04-08 | 2021-10-14 | 云南磷化集团有限公司 | Method for improving grinding and classification capacity by reducing sand deposition fineness ratio value |
| CN111530605A (en) * | 2020-05-13 | 2020-08-14 | 玉溪师范学院 | Ore grinding method for improving lepidolite recovery rate |
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