CN101708487A - Method for utilizing mill tailings by acidifying - Google Patents
Method for utilizing mill tailings by acidifying Download PDFInfo
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- CN101708487A CN101708487A CN200910066154A CN200910066154A CN101708487A CN 101708487 A CN101708487 A CN 101708487A CN 200910066154 A CN200910066154 A CN 200910066154A CN 200910066154 A CN200910066154 A CN 200910066154A CN 101708487 A CN101708487 A CN 101708487A
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Abstract
The invention relates to a method for utilizing mill tailings by acidifying, which is characterized by comprising the following steps of: adding an inorganic acid 2 to mill tailing slurry 5, setting A as an adding point and adjusting a pH value to be less than or equal to 6.5, or adding the inorganic acid 2 to concentrate mill tailing slurry 1 produced by mill tailing condensing equipment 6, setting B as the adding point and adjusting the pH value to be less than or equal to 6.5; performing operations of filtering and solid-liquid separation by solid-liquid separating equipment 3 to obtain solid-state mill tailings 10 of which the water content is lower than 45 percent and acid-containing water 4; adding the acid-containing water 4 to the non-concentrated mill tailing slurry 5 and concentrating the non-concentrated mill tailing slurry 5 by the mill tailing condensing equipment 6; and adding overflow water 7 produced by the mill tailing condensing equipment 6 to concentrate slurry 8; and concentrating the concentrate slurry 8 by concentrate ore concentrating equipment 9. The method for utilizing the mill tailings by acidifying is particularly suitable for utilizing positive floatation mill tailings of bauxite by acidifying by taking sodium hexametaphosphate as a reagent for beneficiation.
Description
Affiliated technical field
The method that a kind of milltailings acidifying utilizes, be applicable to ore dressing with the metalliferous mineral of the alkaline flotation environment in pH value 〉=7.0, be mainly used in eliminate in the bauxite forward flotation mine tailing beneficiation reagent especially calgon be the influence of inhibitor to filtering, improve the strainability of mine tailing, and make full use of the settling property that the inorganic acid that adds in the process improves mine tailing slurry and concentrate slurry.
Related background art
Along with the dilution day by day of China's bauxite resource, the aluminum oxide industry production capacity that China is huge will have to rely on the ore concentration of bauxite technology to guarantee to smelt supply with qualified bauxite.At present the bauxite technique of preparing in Central Region aluminium manufacturer, wish applications of putting into production of Aluminum, Cayman Aluminum and Huiyuan's Aluminum, the technology of ore concentration of bauxite is increasingly mature, but the processing of present bauxite is a still unsolved technical barrier always.The ore dressing engineering of Central Region aluminium manufacturer has produced a large amount of mine tailings in several years of operation, because the mine tailing particle has been composed sodium carbonate and six inclined to one side sodium sulphate, sodium carbonate has good particle peptizaiton and is unfavorable for concentrating and Separation of Solid and Liquid of mine tailing, calgon is a compound with circulus, its circulus has good skeleton and supports peptizaiton, thereby caused the mine tailing slurry after concentrating to be difficult to by filtering, methods such as sedimentation compression obtain solid-state mine tailing, the mine tailing that is difficult to compression precipitating has in a large number filled up tailing dam, not only caused environmental pollution and potential safety hazard, utilizable mine tailing resource is wasted in a large number.Mine tailing main component after dehydration is kaolinite, illite, pyrophillite etc., the raw materials for production that these materials can be used as construction material are used, if can be good at realizing tailings dewatering, the mine tailing of ore concentration of bauxite just can all be used, thereby has avoided the pollution and the wasting of resources of environment.
In the bauxite forward flotation process, owing to used sodium carbonate and calgon to be dispersant and inhibitor, mine tailing slurry and concentrate slurry all need to add acid and neutralize a part of sodium carbonate, adjust pH value 7.0-8.5 and guarantee that the sinking speed of concentrate slurry and mine tailing slurry is to satisfy the needs that sedimentation concentrates.The present invention has improved the adding approach of inorganic acid, realized the recycling of inorganic acid, the inorganic acid that adds in concentrating the mine tailing slurry makes the mine tailing slurry be able to acidifying, make the mine tailing slurry obtain solid-state mine tailing by Separation of Solid and Liquid, the water reuse that contains acid that mine tailing slurry Separation of Solid and Liquid produces joins the pH value that helps reducing the mine tailing slurry in the mine tailing slurry, the settling property of mine tailing is greatly improved, avoids adding the influence that flocculant produces floatation system; The overflow water that the mine tailing slurry concentrates joins again the pH value of concentrate slurry is minimized, thereby has improved the settling property of concentrate slurry greatly, and helps the filtering means dehydration of concentrate.Thereby the inorganic acid that makes adding has played the multiplex effect of an acid, compares with present beneficiation flowsheet acid adding amount, does not increase the consumption of raw ore acid per ton.
Because tailing slurry settlement poor performance, often when adjusting PH, also need to add high polymer coagulant in the production process, flocculant has certain negative effect to flotation, cause the tailing slurry settlement overflow water not recycle, the present invention has been owing to changed approach with acid, can the pH value of Tailings Slurry before the sedimentation adjust lower, need not in the situation of flocculant, just can realize the sedimentation concentration of Tailings Slurry, not only save flocculant the tailing slurry settlement overflow water can be recycled.
Accompanying drawing is a technological process principle sketch of the present invention
The content of invention
The present invention be directed to the bauxite forward flotation mine tailing is difficult to handle and is difficult to the problem of reuse with mine tailing sedimentation overflow water and studies and invent.The present invention adds inorganic acid 2 in milltailings slurry 5, add point and be A, adjusts pH value≤6.5, perhaps adds inorganic acid 2 in the concentrated Tailings Slurry 1 that is produced by milltailings slurry concentrator 6, adds point and is B, adjusts pH value≤6.5; Filter the Separation of Solid and Liquid operation by solid-liquid separating equipment 3 then, obtain the water 4 that moisture is lower than 45% solid-state mine tailing 10 and contains acid; The milltailings that the water 4 that contains acid joins before concentrating is starched in 5, and the pH value of adjustment milltailings slurry 5 is 1.0-8.5, concentrates through 6 pairs of concentrated front milltailings slurries 5 of milltailings slurry concentrator; The overflow water 7 that again milltailings concentrator 6 is produced joins in the concentrate slurry 8, and adjusting the concentrate slurry pH value is 6.5-9.0, concentrates through 9 pairs of concentrate slurries 8 of concentrate concentrator.
Method of the present invention is under the situation of the consumption that does not increase inorganic acid, improve sour adding approach and utilized approach, it is recycling that inorganic acid is obtained, concentrate the mine tailing slurry and be easy to after acidifying realize that Separation of Solid and Liquid obtains solid-state mine tailing, the water that contains acid is back to use the pH value that helps reducing the mine tailing slurry in the mine tailing slurry, the settling property of mine tailing is greatly improved, avoids adding the influence that flocculant produces floatation system; The overflow water that the mine tailing slurry concentrates joins the pH value of concentrate slurry is minimized, thereby has improved the settling property of concentrate slurry greatly, and helps the filtering means dehydration of concentrate.
The objective of the invention is to be achieved through the following technical solutions.
Method of the present invention is to add inorganic acid 2 in milltailings slurry 5, adds point and is A, adjusts pH value≤6.5, perhaps adds inorganic acid 2 in the concentrated Tailings Slurry 1 that is produced by milltailings slurry concentrator 6, adds point and is B, adjusts pH value≤6.5; Filter the Separation of Solid and Liquid operation by solid-liquid separating equipment 3 then, obtain the water 4 that moisture is lower than 45% solid-state mine tailing 10 and contains acid; The milltailings that the water 4 that contains acid joins before concentrating is starched in 5, and the pH value of adjustment milltailings slurry 5 is 1.0-8.5, concentrates through 6 pairs of concentrated front milltailings slurries 5 of milltailings slurry concentrator; The overflow water 7 that again milltailings concentrator 6 is produced joins in the concentrate slurry 8, and adjusting the concentrate slurry pH value is 6.5-9.0, concentrates through 9 pairs of concentrate slurries 8 of concentrate concentrator.
The specific embodiment
In the concentrated Tailings Slurry 1 that milltailings slurry concentrator 6 produces, add sulfuric acid 2, add point and be B, adjust pH value≤6.5, the addition of inorganic acid adds according to system's acid consumption, the acid adding amount is raw ore 0.3-3.0Kg per ton, and the acid of adding is sulfuric acid preferably, and the acid that makes adding that stirs in tank diameter after the acid adding can fully be reacted, filter the Separation of Solid and Liquid operation by solid-liquid separating equipment 3 then, obtain the water 4 that moisture is lower than 45% solid-state mine tailing 10 and contains acid; The milltailings that the water 4 that contains acid joins before concentrating is starched in 5, adding point can be in the feeding mouth in flotation tailing groove or the milltailings slurry concentrator 6, the pH value of adjusting milltailings slurry 5 is 1.0-8.5, and the milltailings slurry 5 before concentrating through 6 pairs of milltailings slurry concentrators concentrates; The overflow water 7 that again milltailings concentrator 6 is produced joins in the concentrate slurry 8, adding point can be in the feeding mouth in flotation concentrate chute or flotation concentrate groove or the concentrate concentrator 9, adjusting the concentrate slurry pH value is 6.5-9.0, concentrates through 9 pairs of concentrate slurries 8 of concentrate concentrator.
The present invention is described further below in conjunction with embodiment.
In the concentrated Tailings Slurry 1 that milltailings slurry concentrator 6 produces, add sulfuric acid 2, add point and be B, the pH value of milltailings slurry 5 is 9.5-10, the milltailings slurry concentrator 6 of milltailings slurry concentrator 6 is efficient no transmission subsider, the solid concentration that concentrates Tailings Slurry 1 is 50%-60%, the addition of sulfuric acid is raw ore 1.0-1.5Kg per ton, the pH value of the concentrated Tailings Slurry 1 after being acidified with acid≤1.0, concentrated Tailings Slurry 1 after the acidifying stirs in tank diameter after the acid that makes adding can fully react, the viscosity of Tailings Slurry greatly reduces, carry out the Separation of Solid and Liquid operation by filter press then, the moisture that obtains solid-state mine tailing 10 is 10%-15%; The water 4 that contains acid is entered into Tailings Slurry concentrator 6 efficient no transmission subsiders jointly with concentrated front milltailings slurry 5 to be mixed, the pH value of milltailings slurry 5≤4.0 after mixing, 10 minutes of milltailings slurry 5 heavy speed surpasses 20mm, supernatant floating material≤0.3g/L after mixing; The overflow water 7 parts gravity flow that again milltailings concentrator 6 is produced enters in the concentrate concentrator 9 efficient no transmission subsiders and mixes with concentrate slurry 8, another part gravity flow joins and is used for the concentrate froth breaking in the flotation concentrate Foam Flowing Groove, the pH value of concentrate slurry 8 is 7.5-8.5 after mixing, 10 minutes of concentrate slurry 8 heavy speed surpasses 30mm, supernatant floating material≤0.3g/L after mixing; After concentrating concentrate slurry 8, concentrate concentrator 9 efficient no transmission subsiders can obtain the concentrated concentrate slurry that solid concentration is 40%-60%.The pH value of flotation global cycle water is 7.5-8.5, can satisfy the needs that water circulation is used.
In milltailings slurry 5, add sulfuric acid 2, add point and be A, the pH value of milltailings slurry 5 is 9.5-10, milltailings slurry concentrator 6 is efficient no transmission subsider, the solid concentration that concentrates Tailings Slurry 1 is 60%-65%, and the addition of sulfuric acid is raw ore 1.5-2.0Kg per ton, the pH value of the milltailings slurry 5 after being acidified with acid≤3.0, concentrate Tailings Slurry 1 and carry out the Separation of Solid and Liquid operation by filter press, the moisture that obtains solid-state mine tailing 10 is 9%-12%; The water 4 that contains acid with concentrate before milltailings slurry 5 jointly enter into Tailings Slurry concentrator 6 efficient no transmission subsiders and mix, sank in 10 minutes of milltailings slurry 5 after mixing fast above 30mm, supernatant floating material≤0.1g/L; The overflow water 7 parts gravity flow that again milltailings concentrator 6 is produced enters in the concentrate concentrator 9 efficient no transmission subsiders and mixes with concentrate slurry 8, another part gravity flow joins and is used for the concentrate froth breaking in the flotation concentrate Foam Flowing Groove, the pH value of concentrate slurry 8 is 7.0-8.0 after mixing, 10 minutes of concentrate slurry 8 heavy speed surpasses 50mm, supernatant floating material≤0.1g/L after mixing; After concentrating concentrate slurry 8, concentrate concentrator 9 efficient no transmission subsiders can obtain the concentrated concentrate slurry that solid concentration is 50%-70%.The pH value of flotation global cycle water is 7.0-8.0, can satisfy the needs that water circulation is used.
Embodiment 3
In the concentrated Tailings Slurry 1 that milltailings slurry concentrator 6 produces, add sulfuric acid 2, the pH value of milltailings slurry 5 is 9.5-10, milltailings slurry concentrator 6 is efficient no transmission subsider, the solid concentration that concentrates Tailings Slurry 1 is 40%-60%, the addition of sulfuric acid is raw ore 0.7-1.0Kg per ton, the pH value of the concentrated Tailings Slurry 1 after being acidified with acid≤1.0, concentrated Tailings Slurry 1 after the acidifying stirs in tank diameter after the acid that makes adding can fully react, the viscosity of Tailings Slurry greatly reduces, carry out the Separation of Solid and Liquid operation by filter press then, the moisture that obtains solid-state mine tailing 10 is 10%-15%; The water 4 that contains acid is entered into Tailings Slurry concentrator 6 efficient no transmission subsiders jointly with concentrated front milltailings slurry 5 to be mixed, the pH value of milltailings slurry 5 is 6.5-7.8 after mixing, 10 minutes of milltailings slurry 5 heavy speed surpasses 10-15mm, supernatant floating material 1.0-3.0g/L after mixing; The overflow water 7 parts gravity flow that again milltailings concentrator 6 is produced enters in the concentrate concentrator 9 efficient no transmission subsiders and mixes with concentrate slurry 8, another part gravity flow joins and is used for the concentrate froth breaking in the flotation concentrate Foam Flowing Groove, the pH value of concentrate slurry 8 is 8.0-9.0 after mixing, 10 minutes of concentrate slurry 8 heavy speed surpasses 20mm, supernatant floating material 0.5-2.0g/L after mixing; After concentrating concentrate slurry 8, concentrate concentrator 9 efficient no transmission subsiders can obtain the concentrated concentrate slurry that solid concentration is 50%-70%.The pH value of flotation global cycle water is 8.0-9.0, and floating material 0.5-2.0g/L is for satisfying the bottom line that water recycles.
Embodiment 4
In the concentrated Tailings Slurry 1 that milltailings slurry concentrator 6 produces, add sulfuric acid 2, the pH value of milltailings slurry 5 is 9.5-10, milltailings slurry concentrator 6 is concentrator, the solid concentration that concentrates Tailings Slurry 1 is 25%-40%, the addition of sulfuric acid is raw ore 1.0-1.5Kg per ton, the pH value of the concentrated Tailings Slurry 1 after being acidified with acid≤2.0, concentrated Tailings Slurry 1 after the acidifying stirs in tank diameter after the acid that makes adding can fully react, the viscosity of Tailings Slurry greatly reduces, carry out the Separation of Solid and Liquid operation by filter press then, the moisture that obtains solid-state mine tailing 10 is 12%-18%; The water 4 that contains acid is entered into Tailings Slurry concentrator 6 efficient no transmission subsiders jointly with concentrated front milltailings slurry 5 to be mixed, the pH value of milltailings slurry 5≤4.0 after mixing, 10 minutes of milltailings slurry 5 heavy speed surpasses 20mm, supernatant floating material≤1.0g/L after mixing; The overflow water 7 parts gravity flow that again milltailings concentrator 6 is produced enters in concentrate concentrator 9 concentrators and mixes with concentrate slurry 8, another part gravity flow joins and is used for the concentrate froth breaking in the flotation concentrate Foam Flowing Groove, the pH value of concentrate slurry 8 is 7.5-8.5 after mixing, 10 minutes of concentrate slurry 8 heavy speed surpasses 30mm, supernatant floating material≤1.0g/L after mixing; After concentrating concentrate slurry 8, concentrate concentrator 9 efficient no transmission subsiders can obtain the concentrated concentrate slurry that solid concentration is 25%-40%.The pH value of flotation global cycle water is 7.5-8.5, can satisfy the needs that water circulation is used.
In milltailings slurry 5, add sulfuric acid 2, add point and be A, the pH value of milltailings slurry 5 is 9.5-10, milltailings slurry concentrator 6 is concentrator, the solid concentration that concentrates Tailings Slurry 1 is 35%-45%, and the addition of sulfuric acid is raw ore 1.5-2.0Kg per ton, the pH value of the milltailings slurry 5 after being acidified with acid≤4.0, concentrate Tailings Slurry 1 and carry out the Separation of Solid and Liquid operation by filter press, the moisture that obtains solid-state mine tailing 10 is 10%-15%; The water 4 that contains acid with concentrate before milltailings slurry 5 jointly enter into Tailings Slurry concentrator 6 efficient no transmission subsiders and mix, sank in 10 minutes of milltailings slurry 5 after mixing fast above 20mm, supernatant floating material≤0.3g/L; The overflow water 7 parts gravity flow that again milltailings concentrator 6 is produced enters in concentrate concentrator 9 concentrators and mixes with concentrate slurry 8, another part gravity flow joins and is used for the concentrate froth breaking in the flotation concentrate Foam Flowing Groove, the pH value of concentrate slurry 8 is 7.5-8.5 after mixing, 10 minutes of concentrate slurry 8 heavy speed surpasses 30mm, supernatant floating material≤0.3g/L after mixing; After concentrating concentrate slurry 8, concentrate concentrator 9 efficient no transmission subsiders can obtain the concentrated concentrate slurry that solid concentration is 35%-45%.The pH value of flotation global cycle water is 7.5-8.5, can satisfy the needs that water circulation is used.
In the concentrated mine tailing slurry 1 that milltailings slurry concentrator 6 produces, add sulfuric acid 2, the pH value of milltailings slurry 5 is 9.5-10, milltailings slurry concentrator 6 is a concentrator, the solid concentration that concentrates mine tailing slurry 1 is 25%-35%, the addition of sulfuric acid is raw ore 0.7-1.0Kg per ton, pH value≤3.0 of the concentrated mine tailing slurry 1 after being acidified with acid, concentrated mine tailing slurry 1 after the acidifying stirs in tank diameter after the acid that makes adding can fully react, the viscosity of mine tailing slurry greatly reduces, carry out the Separation of Solid and Liquid operation by filter press then, the moisture that obtains solid-state mine tailing 10 is 12%-18%; Water 4 that contains acid and concentrated preceding milltailings slurry 5 are entered into mine tailing slurry concentrator 6 efficient no transmission subsiders jointly to be mixed, the pH value that mixes back milltailings slurry 5 is 6.5-8.0,10 minutes heavy speed of mixing back milltailings slurry are 10-15mm, supernatant floating material 3.0-5.0g/L; The overflow water 7 parts gravity flow that milltailings concentrator 6 is produced enters in concentrate concentrator 9 concentrators and mixes with concentrate slurry 8 again, another part gravity flow joins and is used for the concentrate froth breaking in the flotation concentrate Foam Flowing Groove, the pH value that mixes back concentrate slurry 8 is 8.0-9.0,10 minutes heavy speed of mixing back concentrate slurry 8 surpass 10-15mm, supernatant floating material 3.0-5.0g/L; After concentrating concentrate slurry 8, concentrate concentrator 9 efficient no transmission subsiders can obtain the concentrated concentrate slurry that solid concentration is 25%-35%.The pH value of flotation global cycle water is 8.0-9.0, and the pH value of flotation global cycle water is 8.0-9.0, and floating material 3.0-5.0g/L can not satisfy the needs that recycle by water.
Claims (8)
1. the method that the milltailings acidifying utilizes is characterized in that adding inorganic acid 2 in milltailings slurry 5, adds point and is A, adjust pH value≤6.5, perhaps in the concentrated mine tailing slurry 1 that produces by milltailings slurry concentrator 6, add inorganic acid 2, add point and be B, adjust pH value≤6.5; Filter the Separation of Solid and Liquid operation by solid-liquid separating equipment 3 then, obtain the water 4 that moisture is lower than 45% solid-state mine tailing 10 and contains acid; The milltailings that the water 4 that contains acid joins before concentrating is starched in 5, and the milltailings before concentrating through 6 pairs of milltailings slurry concentrators is starched 5 and is concentrated; The overflow water 7 that milltailings concentrator 6 is produced joins in the concentrate slurry 8 again, concentrates through 9 pairs of concentrate slurries 8 of concentrate concentrator.
2. the method that a kind of milltailings according to claim 1 is handled, it is characterized in that: inorganic acid is sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, CO
2, among the SO2, chlorine one or more.
3. the method that a kind of milltailings acidifying according to claim 1 utilizes is characterized in that: the milltailings that the water 4 that contains acid of solid-liquid separating equipment 3 outputs joins before concentrating is starched in 5, and the pH value of adjusting milltailings slurry 5 is 1.0-8.5.
4. the method utilized of a kind of milltailings acidifying according to claim 1 is characterized in that: the adding point A of inorganic acid 2 and the adding point B of inorganic acid 2, can add simultaneously, and also can add separately.
5. the method that a kind of milltailings acidifying according to claim 1 utilizes is characterized in that: the overflow water 7 that milltailings concentrator 6 produces joins in the concentrate slurry 8, and adjusting the concentrate slurry pH value is 6.5-9.0.
6. the method that a kind of milltailings acidifying according to claim 1 utilizes is characterized in that: milltailings concentrator 6 can be efficient no transmission subsider or concentrator with concentrate concentrator 9.
7. the method that a kind of milltailings acidifying according to claim 1 utilizes is characterized in that: solid-liquid separating equipment 3 can be in filter press, vacuum filter, pressing filter or the tubular filter one or more.
8. the method that a kind of milltailings acidifying according to claim 1 utilizes is characterized in that: the solid concentration that concentrates mine tailing slurry 1 is 20%-75%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102407049A (en) * | 2011-09-14 | 2012-04-11 | 鞍钢集团矿业公司 | Multistage-combined filtering method for hematite concentrate |
| CN102806137A (en) * | 2012-09-12 | 2012-12-05 | 中国地质科学院矿产综合利用研究所 | Method for treating sulfur-containing bauxite |
| CN102962141A (en) * | 2012-12-04 | 2013-03-13 | 玉溪大红山矿业有限公司 | Overflow defoaming method for effectively preventing loss of concentrate foam and floatation device thereof |
| CN104128358A (en) * | 2014-08-04 | 2014-11-05 | 许盛英 | Acidified phosphate ore tailing |
| CN111558606A (en) * | 2020-06-05 | 2020-08-21 | 瀜矿环保科技(上海)有限公司 | Hydrometallurgical multistage reaction and separation system based on carbon dioxide |
-
2009
- 2009-09-05 CN CN200910066154A patent/CN101708487A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102407049A (en) * | 2011-09-14 | 2012-04-11 | 鞍钢集团矿业公司 | Multistage-combined filtering method for hematite concentrate |
| CN102407049B (en) * | 2011-09-14 | 2013-09-04 | 鞍钢集团矿业公司 | Multistage-combined filtering method for hematite concentrate |
| CN102806137A (en) * | 2012-09-12 | 2012-12-05 | 中国地质科学院矿产综合利用研究所 | Method for treating sulfur-containing bauxite |
| CN102806137B (en) * | 2012-09-12 | 2014-07-30 | 中国地质科学院矿产综合利用研究所 | Method for treating sulfur-containing bauxite |
| CN102962141A (en) * | 2012-12-04 | 2013-03-13 | 玉溪大红山矿业有限公司 | Overflow defoaming method for effectively preventing loss of concentrate foam and floatation device thereof |
| CN102962141B (en) * | 2012-12-04 | 2015-03-25 | 玉溪大红山矿业有限公司 | Overflow defoaming method for effectively preventing loss of concentrate foam and floatation device thereof |
| CN104128358A (en) * | 2014-08-04 | 2014-11-05 | 许盛英 | Acidified phosphate ore tailing |
| CN111558606A (en) * | 2020-06-05 | 2020-08-21 | 瀜矿环保科技(上海)有限公司 | Hydrometallurgical multistage reaction and separation system based on carbon dioxide |
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Application publication date: 20100519 |