CN102327801A - Selective milling method for low-grade lead zinc ores - Google Patents
Selective milling method for low-grade lead zinc ores Download PDFInfo
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- CN102327801A CN102327801A CN201110287901A CN201110287901A CN102327801A CN 102327801 A CN102327801 A CN 102327801A CN 201110287901 A CN201110287901 A CN 201110287901A CN 201110287901 A CN201110287901 A CN 201110287901A CN 102327801 A CN102327801 A CN 102327801A
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- 238000003801 milling Methods 0.000 title claims abstract description 32
- JQJCSZOEVBFDKO-UHFFFAOYSA-N lead zinc Chemical compound [Zn].[Pb] JQJCSZOEVBFDKO-UHFFFAOYSA-N 0.000 title claims abstract description 18
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000011701 zinc Substances 0.000 claims abstract description 32
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000000227 grinding Methods 0.000 claims description 47
- 239000004576 sand Substances 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000012141 concentrate Substances 0.000 abstract description 12
- 238000011084 recovery Methods 0.000 abstract description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 description 16
- 239000011707 mineral Substances 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 229910052949 galena Inorganic materials 0.000 description 7
- XCAUINMIESBTBL-UHFFFAOYSA-N lead(ii) sulfide Chemical compound [Pb]=S XCAUINMIESBTBL-UHFFFAOYSA-N 0.000 description 7
- 238000007599 discharging Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 4
- 239000004575 stone Substances 0.000 description 4
- 229910052984 zinc sulfide Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- WGPCGCOKHWGKJJ-UHFFFAOYSA-N sulfanylidenezinc Chemical compound [Zn]=S WGPCGCOKHWGKJJ-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052683 pyrite Inorganic materials 0.000 description 2
- 239000011028 pyrite Substances 0.000 description 2
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 2
- 229910001656 zinc mineral Inorganic materials 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000005083 Zinc sulfide Substances 0.000 description 1
- 229910052951 chalcopyrite Inorganic materials 0.000 description 1
- DVRDHUBQLOKMHZ-UHFFFAOYSA-N chalcopyrite Chemical compound [S-2].[S-2].[Fe+2].[Cu+2] DVRDHUBQLOKMHZ-UHFFFAOYSA-N 0.000 description 1
- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- -1 marmatite Chemical compound 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention discloses a selective milling method for low-grade lead zinc ores. By utilizing the difference of carbonaceous contents in the lead zinc ores, the low-grade lead zinc ores are discharged from a mill as natural ore blocks through adjusting an ore pulp concentration expressed in percentage by weight and an grader overflowing concentration expressed in percentage by weight, so that the unnecessary milling is avoided. After the low-grade lead zinc raw ores are processed by using the method, the grades of lead ore concentrate and zinc ore concentrate are improved to more than 40% and 47% respectively, a lead recovery rate is more than 65% and a zinc recovery rate is more than 91%. With the adoption of the method, the size distribution of milling products is rational and a grading index of the follow-up grading work is effectively improved.
Description
Technical field
The present invention relates to a kind of selective ore milling process, relate in particular to a kind of low-grade lead zinc ore selective ore milling process.
Background technology
The plumbous zinc ore mineral resources of China mainly are distributed in south China and western part, and general characteristic is that rich ore is few, and low-grade ore is many; Large ore is few, and middle-size and small-size ore deposit is many; Accompanying element is more, and ore type is complicated, and the exploitation difficulty is bigger.Ore type is mainly lead-zinc sulfide ore, lead-zinc and mixed lead zinc ore etc., wherein is that main lead-zinc deposit and copper zinc deposit is more with zinc, and is that the lead-zinc deposit led is less with lead.Valuable mineral in the ore is main with magnetic iron ore, pyrite, marmatite, zincblende, is galena secondly, and chalcopyrite seldom.Gangue mineral is main with quartz, is calcite, graphite, sericite secondly.
Lead-zinc ore hardness is little, and general Polodyakonov coefficient coefficient is f=8～10, hard soft mineral partially in the genus; But the mechanical property of ore is complicated: 1. various mineral mechanical properties are different in the ore, the crisp easy argillization of galena property, and also disseminated grain size is thin; Majority concentrates on 0.147～0.020 ㎜, and zincblende then is difficult for by argillization, and disseminated grain size is thicker; Majority concentrates on 0.417～0.208 ㎜, and pyritous embedding cloth and galena are similar.If mog is not high, then galena is difficult for dissociating out; Mog is too high, though galena dissociates out, the argillization phenomenon also strengthens.2. because major metal mineral zincblende, galena, pyrite differences of mechanical properties are big, certainly lead to remarkable selectivity in the ore grinding and grind phenomenon, in ore grinding, should guarantee to dissociate between the mineral, stop the galena argillization that is prone to argillization again.
The plumbous zinc ore ore dressing of China is main with the stage grinding stage grading generally, in primary grinding, generally adopts overflowball mill and hydrocyclone to form closed-circuit system, and ore milling product granularity-0.074mm accounts for 65～70%.Because plumbous zinc ore crude grade is generally 0.70% and 4.80%, grade is lower, is being mingled with the part grade ore entering ball mill also lower than tailings grade in the raw ore and is grinding; Not only consumed a large amount of power consumptions; And got into follow-up floatation system by the low ore of levigate grade, because mog is unreasonable, plumbous zinc liberation degree of minerals is not high; It is serious that plumbous zinc contains phenomenon mutually, causes the concentrate grade of plumbous zinc and the rate of recovery on the low side.
Summary of the invention
The purpose of this invention is to provide a kind of milling method that low-grade lead zinc ore ore-dressing technique requires that is suitable for, make ore milling product granularmetric composition reasonable, reduce it and cross pulverizing; Carbonaceous mineral to grade is lower are discharged grinding machine as early as possible, avoid unnecessary grinding.Through selective milling to plumbous zinc ore; Abandoned in advance and be mixed in ore also lower in the raw ore, improved the whole grade that gets into flotation of ores, optimized the ore milling product particle property than tailings grade; Improve the liberation degree of minerals of plumbous zinc mineral, can further improve sorting index.
The present invention is achieved in that the difference of utilizing carbonaceous content in the plumbous zinc ore to achieve these goals; The mineral density that carbonaceous is high is low, and through regulating pulp density and overflow concentration in classifier, the plumbous zinc ore that grade is low is the nature nugget and discharges from grinding machine mine-discharging terminal rotary screen; Avoid unnecessary grinding; The grinding process condition is following: granularity is added the primary grinding machine less than the plumbous zinc ore of 20mm carry out ore grinding, grinding condition is an ore grinding concentration expressed in percentage by weight 75～78%, classifier overflow concentration expressed in percentage by weight 36～38%; The sand return ratio is 200～250%, and the ore milling product granularity accounts for 69～72% for-0.074mm.
Ore mill described in the present invention is the wet type overflowball mill.
Grader described in the present invention is a hydrocyclone, and hydrocyclone and one section ball mill constitute one section closed circuit grinding.
Advantage of the present invention and effect are following: after adopting above-mentioned milling method; Under the identical situation of plumbous zinc ore raw ore chemical composition and size distribution; Make primary grinding product granularity-0.074mm content bring up to 69～72% from 63～64%, improved 6～8 percentage points, under this ore discharge granularity; The ore milling product rational size distribution has effectively been improved the sorting index of follow-up sorting operation.Simultaneously, plumbous zinc contains phenomenon mutually and also is greatly improved, and contains zinc in the lead concentrate and is lower than 4.3%, leadedly in the zinc concentrate is lower than 0.9%.Under the situation that head grade basically slightly descends, plumbous concentrate grade is brought up to more than 40%, and the rate of recovery is from bringing up to more than 65% simultaneously; The concentrate grade of zinc is brought up to more than 47%, simultaneously more than the rate of recovery to 91%.
The present invention is suitable for the requirement of plumbous zinc ore selective milling; Make ore milling product by suitable granularmetric composition; Raw ore to grade is low is thrown tail in advance, avoids unnecessary grinding, and has improved the liberation degree of minerals of plumbous zinc mineral; Reduced and contained ratio leaded in zinc and the zinc concentrate in the lead concentrate, improved the concentrate grade and the rate of recovery of plumbous zinc.
Description of drawings
Fig. 1 is plumbous zinc ore selective milling primary grinding process chart.
Crushed product is the ore entering overflowball mill less than 20mm, and ore milling product is through hydroclone classification, and sand return is through the closed circuit grinding machine that returns, and the fine fraction that overflow obtains is as the product of primary grinding.
Below in conjunction with instance the present invention is done further explain, but protection scope of the present invention is not limit by embodiment.
The specific embodiment
Embodiment 1
Raw material: the comprehensive sample ore 1 in plumbous zinc ore district, Inner Mongol, its essential element analysis is (%)
| Element | Z n | P b | C u | S | A g | A u | C Always |
| Mass fraction | 4.85 | 0.72 | 0.175 | 12.00 | 35.00 | 0.10 | 4.54 |
Method is: go into ore grinding stone granularity less than 20mm, regulate grinding machine and give mineral water, keeping the ore grinding concentration expressed in percentage by weight is 77%; Regulate the grinding machine mine-discharging terminal water yield, control classifier overflow weight percent fineness is 37%; The sand return ratio is controlled at 200%, and ore milling product granularity-0.074mm accounts for 70%; Ore mill is the wet type overflowball mill; Grader is a hydrocyclone, and hydrocyclone and one section ball mill constitute one section closed circuit grinding.
Comparing result is following before and after the commerical test of plumbous zinc ore selective milling:
Embodiment 2
Raw material is with embodiment 1.
Method is: go into ore grinding stone granularity less than 20mm, regulate grinding machine and give mineral water, keeping the ore grinding concentration expressed in percentage by weight is 78%; Regulate the grinding machine mine-discharging terminal water yield, control classifier overflow weight percent fineness is 36%; The sand return ratio is controlled at 250%, and ore milling product granularity-0.074mm accounts for 71%; Ore mill is the wet type overflowball mill; Grader is a hydrocyclone, and hydrocyclone and one section ball mill constitute one section closed circuit grinding.
Comparing result is listed in the table below before and after the commerical test of plumbous zinc ore selective milling:
Embodiment 3
Raw material: the comprehensive sample ore 2 in plumbous zinc ore district, Inner Mongol, its essential element analysis is (%)
| Element | Z n | P b | C u | S | A g | A u | C Always |
| Mass fraction | 4.79 | 0.70 | 0.17 | 12.30 | 35.37 | 0.11 | 4.51 |
Method is: go into ore grinding stone granularity less than 20mm, regulate grinding machine and give mineral water, keeping the ore grinding concentration expressed in percentage by weight is 76%; Regulate the grinding machine mine-discharging terminal water yield, control classifier overflow weight percent fineness is 36%; The sand return ratio is controlled at 200%, and ore milling product granularity-0.074mm accounts for 71%; Ore mill is the wet type overflowball mill; Grader is a hydrocyclone, and hydrocyclone and one section ball mill constitute one section closed circuit grinding.
Comparing result is listed in the table below before and after the commerical test of plumbous zinc ore selective milling:
Embodiment 4
Raw material is with embodiment 3.
Method is: go into ore grinding stone granularity less than 20mm, regulate grinding machine and give mineral water, keeping the ore grinding concentration expressed in percentage by weight is 77%; Regulate the grinding machine mine-discharging terminal water yield, control classifier overflow weight percent fineness is 37%; The sand return ratio is controlled at 225%, and ore milling product granularity-0.074mm accounts for 70%; Ore mill is the wet type overflowball mill; Grader is a hydrocyclone, and hydrocyclone and one section ball mill constitute one section closed circuit grinding.
Comparing result is listed in the table below before and after the commerical test of plumbous zinc ore selective milling:
Claims (4)
1. low-grade lead zinc ore selective ore milling process; It is characterized in that: utilize the difference of carbonaceous content in the plumbous zinc ore, through regulating ore pulp concentration expressed in percentage by weight and classifier overflow concentration expressed in percentage by weight, the plumbous zinc ore that grade is low is the nature nugget and from ball mill, discharges; Avoid unnecessary grinding; The grinding process condition is following: granularity is added the primary grinding machine less than the plumbous zinc ore of 20mm carry out ore grinding, grinding condition is an ore grinding concentration expressed in percentage by weight 75～78%, classifier overflow concentration expressed in percentage by weight 36～38%; The sand return ratio is 200～250%, and the ore milling product granularity accounts for 69～72% for-0.074mm.
2. according to claims 1 described low-grade lead zinc ore selective ore milling process, it is characterized in that: said ore mill is the wet type overflowball mill.
3. according to claims 1 described low-grade lead zinc ore selective ore milling process, it is characterized in that: said grader is a hydrocyclone.
4. according to claim 1,2 or 3 described low-grade lead zinc ore selective ore milling process, it is characterized in that: hydrocyclone and one section ball mill constitute one section closed circuit grinding.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110287901.XA CN102327801B (en) | 2011-09-26 | 2011-09-26 | Selective milling method for low-grade lead zinc ores |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110287901.XA CN102327801B (en) | 2011-09-26 | 2011-09-26 | Selective milling method for low-grade lead zinc ores |
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| CN102327801A true CN102327801A (en) | 2012-01-25 |
| CN102327801B CN102327801B (en) | 2014-07-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108519309A (en) * | 2018-04-09 | 2018-09-11 | 北京矿冶科技集团有限公司 | It is a kind of to be used for the test method of target minreal granularity and degree of dissociation when ore throws tail in advance |
| CN109092519A (en) * | 2017-09-01 | 2018-12-28 | 景德镇百特威尔新材料有限公司 | A kind of Ball-stirring mill of non-steel ball medium and the sand milling efficient combination grinding process that ends |
Citations (5)
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| US5727740A (en) * | 1996-07-03 | 1998-03-17 | Robinson; Forrest L. | Method and apparatus for recovering fractional components of soil |
| CN1603002A (en) * | 2004-10-29 | 2005-04-06 | 东北大学 | Highly efficient ore dressing system of medium-low class aluminium ore |
| CN101244403A (en) * | 2008-03-17 | 2008-08-20 | 西安艾贝尔科技发展有限公司 | Optimization control method for grind grading process |
| CN101274298A (en) * | 2007-03-27 | 2008-10-01 | 鞍钢集团矿业公司 | Anshan style lean hematite swirler-lattice type ball mill primary closed-circuit grinding grading technique |
| CN102029220A (en) * | 2010-10-25 | 2011-04-27 | 广西华锡集团股份有限公司车河选矿厂 | Separating flotation method of low-grade complex lead-antimony-zinc |
-
2011
- 2011-09-26 CN CN201110287901.XA patent/CN102327801B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5727740A (en) * | 1996-07-03 | 1998-03-17 | Robinson; Forrest L. | Method and apparatus for recovering fractional components of soil |
| CN1603002A (en) * | 2004-10-29 | 2005-04-06 | 东北大学 | Highly efficient ore dressing system of medium-low class aluminium ore |
| CN101274298A (en) * | 2007-03-27 | 2008-10-01 | 鞍钢集团矿业公司 | Anshan style lean hematite swirler-lattice type ball mill primary closed-circuit grinding grading technique |
| CN101244403A (en) * | 2008-03-17 | 2008-08-20 | 西安艾贝尔科技发展有限公司 | Optimization control method for grind grading process |
| CN102029220A (en) * | 2010-10-25 | 2011-04-27 | 广西华锡集团股份有限公司车河选矿厂 | Separating flotation method of low-grade complex lead-antimony-zinc |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109092519A (en) * | 2017-09-01 | 2018-12-28 | 景德镇百特威尔新材料有限公司 | A kind of Ball-stirring mill of non-steel ball medium and the sand milling efficient combination grinding process that ends |
| CN108519309A (en) * | 2018-04-09 | 2018-09-11 | 北京矿冶科技集团有限公司 | It is a kind of to be used for the test method of target minreal granularity and degree of dissociation when ore throws tail in advance |
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| CN102327801B (en) | 2014-07-30 |
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