CN103657838A - Method for recovering pyrite from coal gangue - Google Patents
Method for recovering pyrite from coal gangue Download PDFInfo
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- CN103657838A CN103657838A CN201310657734.2A CN201310657734A CN103657838A CN 103657838 A CN103657838 A CN 103657838A CN 201310657734 A CN201310657734 A CN 201310657734A CN 103657838 A CN103657838 A CN 103657838A
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- sodium silicate
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Abstract
The invention discloses a method for recovering pyrite from coal gangue. The method is characterized by comprising the following steps that the coal gangue is subjected to two-stage closed-circuit crushing, grinding, roughing, primary scavenging, secondary scavenging, primary cleaning and secondary cleaning. In the roughing step, acidified water glass, xanthate and number two oil are sequentially added to fed ore pulp, so that rougher concentrates and rougher tailings are obtained. In the primary scavenging step, acidified water glass, xanthate and number two oil are sequentially added to the rougher tailings, so that primarily scavenged concentrates and primarily scavenged tailings are obtained. In the secondary scavenging step, acidified water glass, xanthate and number two oil are sequentially added to the primarily scavenged tailings, so that secondarily scavenged concentrates and kaolin tailings are obtained. In the primary cleaning step, acidified water glass is added to the rougher concentrates, so that primary cleaner concentrates and primary cleaner tailings are obtained. In the secondary cleaning step, acidified water glass is added to the primary cleaner concentrates, so that the pyrite and secondary cleaner tailings are obtained. The method for recovering the pyrite from the coal gangue is simple; the pyrite recovery rate is high; environmental pollution is reduced; the pyrite can be produced on a large scale.
Description
Technical field
The present invention relates to a kind of method of comprehensive utilization of gangue, relate in particular to a kind of technique of preparing that utilizes and from gangue, reclaim pyritous method.
Background technology
Gangue is the solid waste in progress of coal mining, the gangue that China dumps because of coal mining at present adds up to reach more than 4,500,000,000 tons, floor space is over 1.2 ten thousand hectares, it is the industrial solid castoff of the current discharge capacity maximum of China, not only caused the huge waste of resource, take a large amount of soils, and easily cause environmental pollution.
Essential mineral in gangue is clay and pyrite, and pyritous content is generally more than 3%.In recent years, China is to relieving haperacidity raw material sulphur, pyritous demand fast rise, how to reclaim the pyrite in gangue, turned waste into wealth, can alleviate the situation of current relieving haperacidity sulphur raw material supply anxiety, again that the most direct sulfur dioxide in mining area reduces discharging means, be realize that solid waste is innoxious, the effective way of minimizing, recycling treatment, there is significant Social benefit and economic benefit.
Summary of the invention
Object of the present invention is exactly the defect that will overcome prior art, provide that a kind of method is simple, the pyrite rate of recovery is high, reduce environmental pollution, can be mass-produced from gangue, reclaim pyritous method.
The inventive method is comprised of following steps:
1) fragmentation: by two sections of closed circuit crushings of gangue to-2mm;
2) ore grinding: be under 60% condition by the raw ore after fragmentation at ore milling concentration, ore grinding is to-0.074mm >=98.00% ,-0.043mm >=95.00%;
3) flotation: employing is roughly selected, secondary is scanned, recleaning carries out flotation;
Roughly select: in to ore deposit ore pulp, add successively acidified sodium silicate 2400 ~ 3000g/t, butyl xanthate 250 ~ 350g/t, No. 2 oil 70 ~ 90g/t, stir 12min, scrape bubble time 6min, obtain roughly selecting concentrate and rougher tailings;
Once purging selection: add successively acidified sodium silicate 800 ~ 1000g/t, butyl xanthate 70 ~ 80g/t, No. 2 oil 15 ~ 20g/t in rougher tailings, stir 9min, scrape bubble time 5min, obtain once purging selection concentrate and once purging selection mine tailing;
Secondary is scanned: in once purging selection mine tailing, add successively acidified sodium silicate 250 ~ 400g/t, butyl xanthate 70 ~ 80g/t, No. 2 oil 15 ~ 20g/t, stir 9min, scrape bubble time 4min, obtain secondary scavenger concentrate and Kaolin Tailings, secondary scavenger concentrate returns to once purging selection operation;
Primary cleaning: add acidified sodium silicate 1000 ~ 1200g/t in roughly selecting concentrate, stir 3min, scrape bubble time 5min, obtain primary cleaning concentrate and primary cleaner tailing, primary cleaner tailing and once purging selection concentrate return to be roughly selected operation and select;
Recleaning: add acidified sodium silicate 400 ~ 600g/t in primary cleaning concentrate, stir 3min, scrape bubble time 4min, obtain pyrite and recleaning mine tailing, recleaning mine tailing returns to primary cleaning operation and selects.
Acidified sodium silicate of the present invention is adjusting agent, and butyl xanthate is collecting agent, and No. 2 oil is foaming agent.
Acidified sodium silicate of the present invention is mass ratio 50% sulfuric acid: waterglass mass ratio=1:1.5.
Compared with prior art, advantage of the present invention is:
(1) in gangue, pyrite disseminated grain size is thinner, and when mog-0.074mm accounts for 92.55%, the total degree of dissociation of pyrite just reaches 95.83%.In addition, the fine and tool viscosity of kaolinite crystallization, frangible in grinding process, and be easily adsorbed on sulphide ore surface, and affect sulphide ore surface floatability, unfavorable to sulphide ore and kaolinic FLOTATION SEPARATION.The present invention adopts closed circuit grinding technique, realize pyrite efficient solution from, effectively reduce kaolinic argillization and degree of adhesion, reduce ore grinding cost.
(2) in floatation process, add the acidified sodium silicate agent that adjusts, realized kaolinic effective dispersion and suppressed its flotation, make pyrite can access effective enrichment.
(3) the present invention can effectively reclaim pyrite from gangue, and pyrite grade can reach more than 48.00%, and the rate of recovery can reach more than 85.00%.
(4) kaolinite that the present invention reclaims after pyrite can be used as the raw material of industries such as producing cement, brickmaking, pottery and fully utilizes, and comprehensive utilization of resources rate is high.Meanwhile, can reduce appropriation of land, alleviate long-term stacking of gangue and the environmental pollution that causes, realize energy-saving and emission-reduction, cleaner production.
Accompanying drawing explanation
Fig. 1 is that the present invention reclaims pyritous flow chart from gangue.
The specific embodiment
Below by example, the invention will be further described.
Embodiment 1
The gangue that the sulphur grade of sample ore is 9.86%, concrete steps are as follows:
1) fragmentation: carry out two sections of fragmentations by jaw crusher, then, with 2mm sieve check screening and the closed circuit arrive-2mm in small, broken bits of twin rollers, the sample ore of be broken to-2mm mixes through moving heap method;
2) ore grinding: adopt imitative closed circuit grinding, by the raw ore after fragmentation in the situation that ore milling concentration is 60%, be milled to-0.074mm accounts for 58.83%, adopt the screening of 0.043mm sieve, after sift out-0.043mm grade, + 0.043mm grade is returned to ball milling and is regrinded, and after 3 ore grindings, screening, coarse grain return, mog is for-0.074mm accounts for 98.58% ,-0.043mm accounts for 95.16%;
3) flotation: employing is roughly selected, secondary is scanned, recleaning, and concrete operations are as follows:
Roughly select: in to ore deposit ore pulp, add successively mass ratio 50% sulfuric acid: the acidified sodium silicate 2800g/t of waterglass mass ratio=1:1.5, butyl xanthate 350g/t, No. 2 oily 90g/t, stir respectively 8min, 3min and 1min, scrape bubble time 6min, obtain roughly selecting concentrate and rougher tailings;
Once purging selection: add successively acidified sodium silicate 880g/t, butyl xanthate 80g/t, No. 2 oily 20g/t in rougher tailings, mixing time is respectively 5min, 3min and 1min, scrapes bubble time 5min, obtains once purging selection concentrate and once purging selection mine tailing;
Secondary is scanned: in once purging selection mine tailing, add successively acidified sodium silicate 340g/t, butyl xanthate 75g/t, No. 2 oily 15g/t, mixing time is respectively 5min, 3min and 1min, scrape bubble time 4min, obtain secondary scavenger concentrate and Kaolin Tailings, secondary scavenger concentrate returns to once purging selection operation;
Primary cleaning: add acidified sodium silicate 1100g/t in roughly selecting concentrate, stir 3min, scrape bubble time 5min, obtain primary cleaning concentrate and primary cleaner tailing, primary cleaner tailing and once purging selection concentrate return to be roughly selected operation and select;
Recleaning: add acidified sodium silicate 465g/t in primary cleaning concentrate, stir 3min, scrape bubble time 4min, obtain pyrite and recleaning mine tailing, recleaning mine tailing returns to primary cleaning operation and selects.
By above embodiment, the pyrite grade reclaiming from gangue reaches 48.70%, the rate of recovery reaches 87.50%.
Embodiment 2
The gangue that the sulphur grade of sample ore is 5.65%, concrete steps are as follows:
1) fragmentation: carry out two sections of fragmentations by jaw crusher, then, with 2mm sieve check screening and the closed circuit arrive-2mm in small, broken bits of twin rollers, the sample ore of be broken to-2mm mixes through moving heap method;
2) ore grinding: adopt imitative closed circuit grinding, by the raw ore after fragmentation in the situation that ore milling concentration is 60%, be milled to-0.074mm accounts for 60.65%, adopt the screening of 0.043mm sieve, after sift out-0.043mm grade, + 0.043mm grade is returned to ball milling and is regrinded, and after 3 ore grindings, screening, coarse grain return, mog is for-0.074mm accounts for 99.15% ,-0.043mm accounts for 95.27%;
3) flotation: employing is roughly selected, secondary is scanned, recleaning, and concrete operations are as follows:
Roughly select: in to ore deposit ore pulp, add successively mass ratio 50% sulfuric acid: the acidified sodium silicate 2650g/t of waterglass mass ratio=1:1.5, butyl xanthate 300g/t, No. 2 oily 80g/t, stir respectively 8min, 3min and 1min, scrape bubble time 6min, obtain roughly selecting concentrate and rougher tailings;
Once purging selection: add successively acidified sodium silicate 850g/t, butyl xanthate 70g/t, No. 2 oily 20g/t in rougher tailings, mixing time is respectively 5min, 3min and 1min, scrapes bubble time 5min, obtains once purging selection concentrate and once purging selection mine tailing;
Secondary is scanned: in once purging selection mine tailing, add successively acidified sodium silicate 325g/t, butyl xanthate 70g/t, No. 2 oily 15g/t, mixing time is respectively 5min, 3min and 1min, scrape bubble time 4min, obtain secondary scavenger concentrate and Kaolin Tailings, secondary scavenger concentrate returns to once purging selection operation;
Primary cleaning: add acidified sodium silicate 1000g/t in roughly selecting concentrate, stir 3min, scrape bubble time 5min, obtain primary cleaning concentrate and primary cleaner tailing, primary cleaner tailing and once purging selection concentrate return to be roughly selected operation and select;
Recleaning: add acidified sodium silicate 450g/t in primary cleaning concentrate, stir 3min, scrape bubble time 4min, obtain pyrite and recleaning mine tailing, recleaning mine tailing returns to primary cleaning operation and selects.
By above embodiment, the pyrite grade reclaiming from gangue reaches 48.31%, the rate of recovery reaches 85.65%.
Claims (2)
1. from gangue, reclaim a pyritous method, it is characterized in that being formed by following steps:
1) fragmentation: by two sections of closed circuit crushings of gangue to-2mm;
2) ore grinding: be under 60% condition by the raw ore after fragmentation at ore milling concentration, ore grinding is to-0.074mm >=98.00% ,-0.043mm >=95.00%;
3) flotation: employing is roughly selected, secondary is scanned, recleaning carries out flotation;
Roughly select: in to ore deposit ore pulp, add successively acidified sodium silicate 2400 ~ 3000g/t, butyl xanthate 250 ~ 350g/t, No. 2 oil 70 ~ 90g/t, stir 12min, scrape bubble time 6min, obtain roughly selecting concentrate and rougher tailings;
Once purging selection: add successively acidified sodium silicate 800 ~ 1000g/t, butyl xanthate 70 ~ 80g/t, No. 2 oil 15 ~ 20g/t in rougher tailings, stir 9min, scrape bubble time 5min, obtain once purging selection concentrate and once purging selection mine tailing;
Secondary is scanned: in once purging selection mine tailing, add successively acidified sodium silicate 250 ~ 400g/t, butyl xanthate 70 ~ 80g/t, No. 2 oil 15 ~ 20g/t, stir 9min, scrape bubble time 4min, obtain secondary scavenger concentrate and Kaolin Tailings, secondary scavenger concentrate returns to once purging selection operation;
Primary cleaning: add acidified sodium silicate 1000 ~ 1200g/t in roughly selecting concentrate, stir 3min, scrape bubble time 5min, obtain primary cleaning concentrate and primary cleaner tailing, primary cleaner tailing and once purging selection concentrate return to be roughly selected operation and select;
Recleaning: add acidified sodium silicate 400 ~ 600g/t in primary cleaning concentrate, stir 3min, scrape bubble time 4min, obtain pyrite and recleaning mine tailing, recleaning mine tailing returns to primary cleaning operation and selects.
2. according to claim 1ly from gangue, reclaim pyritous method, it is characterized in that described acidified sodium silicate is mass ratio 50% sulfuric acid: waterglass mass ratio=1:1.5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310657734.2A CN103657838A (en) | 2013-12-09 | 2013-12-09 | Method for recovering pyrite from coal gangue |
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| CN201310657734.2A CN103657838A (en) | 2013-12-09 | 2013-12-09 | Method for recovering pyrite from coal gangue |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105642433A (en) * | 2016-04-13 | 2016-06-08 | 中国矿业大学 | Decarbonization process for coal series kaolin |
| CN110562952A (en) * | 2019-10-08 | 2019-12-13 | 中国矿业大学 | Process for preparing lithium secondary battery material by using coal gangue as raw material |
| CN113522516A (en) * | 2021-07-12 | 2021-10-22 | 中南大学 | Preparation method of high-purity natural pyrite |
| CN115970630A (en) * | 2021-10-15 | 2023-04-18 | 中国矿业大学(北京) | Method for preparing nano hematite by using pyrite in coal-series solid waste |
Citations (5)
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| CA1091622A (en) * | 1976-08-16 | 1980-12-16 | James D. Deimler | Coal recovery system from mine tailings |
| CN1586729A (en) * | 2004-09-23 | 2005-03-02 | 杨慧芬 | Process for extracting iron concentrate by sulfuric slag flotation |
| CN101768662A (en) * | 2008-12-29 | 2010-07-07 | 厦门紫金矿冶技术有限公司 | Utilization method of sulfur-containing magnetite |
| CN101890395A (en) * | 2010-07-19 | 2010-11-24 | 贵州环科院环保产业有限公司 | Method for extracting coal and pyrite from coal gangues |
| CN103301934A (en) * | 2013-05-16 | 2013-09-18 | 北京矿冶研究总院 | Method for recovering fluorite in metal sulfide ore tailings |
-
2013
- 2013-12-09 CN CN201310657734.2A patent/CN103657838A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1091622A (en) * | 1976-08-16 | 1980-12-16 | James D. Deimler | Coal recovery system from mine tailings |
| CN1586729A (en) * | 2004-09-23 | 2005-03-02 | 杨慧芬 | Process for extracting iron concentrate by sulfuric slag flotation |
| CN101768662A (en) * | 2008-12-29 | 2010-07-07 | 厦门紫金矿冶技术有限公司 | Utilization method of sulfur-containing magnetite |
| CN101890395A (en) * | 2010-07-19 | 2010-11-24 | 贵州环科院环保产业有限公司 | Method for extracting coal and pyrite from coal gangues |
| CN103301934A (en) * | 2013-05-16 | 2013-09-18 | 北京矿冶研究总院 | Method for recovering fluorite in metal sulfide ore tailings |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105642433A (en) * | 2016-04-13 | 2016-06-08 | 中国矿业大学 | Decarbonization process for coal series kaolin |
| CN105642433B (en) * | 2016-04-13 | 2017-12-19 | 中国矿业大学 | A kind of Coaseries kaolin decarbonization process |
| CN110562952A (en) * | 2019-10-08 | 2019-12-13 | 中国矿业大学 | Process for preparing lithium secondary battery material by using coal gangue as raw material |
| CN113522516A (en) * | 2021-07-12 | 2021-10-22 | 中南大学 | Preparation method of high-purity natural pyrite |
| CN113522516B (en) * | 2021-07-12 | 2022-09-23 | 中南大学 | Preparation method of high-purity natural pyrite |
| CN115970630A (en) * | 2021-10-15 | 2023-04-18 | 中国矿业大学(北京) | Method for preparing nano hematite by using pyrite in coal-series solid waste |
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Application publication date: 20140326 |