CN1569339A - Two-stage grinding-classifying process for preparing alumina pulp - Google Patents
Two-stage grinding-classifying process for preparing alumina pulp Download PDFInfo
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- CN1569339A CN1569339A CN 200410022388 CN200410022388A CN1569339A CN 1569339 A CN1569339 A CN 1569339A CN 200410022388 CN200410022388 CN 200410022388 CN 200410022388 A CN200410022388 A CN 200410022388A CN 1569339 A CN1569339 A CN 1569339A
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Abstract
The invention discloses a two-segment mineral grinding-classification process, it grinds the bauxite and lime in the rod mill, the grinded raw mine pulp is poured into a pump pool. The classified bottom flow after classified by water swirler is grinded in ball grinder, adjusts the best liquid and solid rate with proper alkali liquid, the discharged mine pulp is poured into the same pump pool, and adds in alkali liquid to maintain the solid content at 470-520g/L, and carries on classification to the compound mine pulp in the water swirler, the bottom flow enters the ball grinder to be grinded.
Description
Technical field:
The present invention relates to a kind of technology of alumina producing slurry preparation.
Technical background:
At Al
2O
3In the production process, it generally all is to use the ball mill ore grinding that bauxite prepares ore pulp, the spiral classifier classification, also use the ball mill ore grinding individually, the primary grinding classification flow process of hydroclone classification, its finished product slurry fineness is inhomogeneous, and thick (63 μ content have only 55～60%), send to the high pressure stripping, Al
2O
3Dissolution rate only reaches about 87%.In classification process, the spiral classifier classification, classification efficiency only reaches 50～60%, causes 40～50% qualified products classifications not come out, and produces the phenomenon of regrinding, and output is carried not high, and energy consumption increases.The five big alumina producers that China has built, slurry preparation all is the weak link in the production process.Generally adopt the grinding grading technique of one section mill-spiral classifier, although these ores are good molten relatively, mog put broad, and actual index does not all reach requirement, qualification rate only about 10%, Al
2O
3Dissolution rate only reaches about 87%.The spiral classifier classification efficiency is low, adds that the corase grind of ore, fine grinding all carry out in same grinding machine, and overground phenomenon takes place the part ore, and the ability of grinding machine is not in full use, and production capacity is low, and the ore grinding power consumption increases.Spiral classifier belongs to the heavy load running device, off-axis is arranged and kill phenomenon, and fault is more.
Summary of the invention:
The objective of the invention is to: a kind of one section rod mill open-circuit grinding is provided, two sections ball mill closed circuit grindings, the new technological flow of hydroclone classification is to improve Al
2O
3Dissolution rate, and reduce qualified products and be back to ball mill and regrind, reduce overground phenomenon, output is improved, energy consumption reduces.
The present invention is achieved in that bauxite, lime adds rod mill in 100: 7～9 ratios and roughly grinds, and adding proper quantity of lye, liquid-solid ratio is 0.4～0.8 in the control mill, the control slurry temperature is at 80～90 ℃, rough slurry fineness 100%＜3000 μ that grinds, 80%＜650～1000 μ, 25～30%＜63 μ enter the pump pond, classification underflow behind hydroclone classification all enters the ball mill fine grinding, the best liquid-solid ratio of regulating under 80～90 ℃ temperature in the mill with proper quantity of lye is 0.4～0.8, the ore pulp of discharging also enters same pump pond, and add alkali lye control temperature at 80～90 ℃, make mixed ore pulp be contained in 470～520g/L admittedly, with the speed governing slush pump mixed ore pulp in pump pond is delivered to hydrocyclone and carry out classification, classification efficiency is more than 80%; Wherein underflow enters ball mill and regrinds, and overflow is the finished product ore pulp.
The present invention compared with prior art because rod mill corase grind ability is big, the ball mill grinding performance is good, hydroclone classification efficient height is easy and simple to handle, guarantees the finished product slurry fineness, thereby makes Al
2O
3Dissolution rate be improved, and reduce qualified products and be back to ball mill and regrind, reduce overground phenomenon, output is improved, energy consumption reduces.The percentage composition of slurry fineness-63 μ is higher more than 10% than one section mill, and classification efficiency is more than 80%, and dissolution rate reaches 93～94%.Compare the 6.22 kilowatt hours/ton ore deposit of economizing on electricity with one section mill.
The specific embodiment:
Embodiments of the invention: with bauxite (lumpiness is less than 25mm), lime (lumpiness is less than 50mm) is roughly ground in 100: 8 ratio adding rod mill, and adding proper quantity of lye, the control temperature is at 80～90 ℃, guarantee that the best liquid-solid ratio of ore grinding is 0.4～0.8 in the mill, the rough slurry that grinds (fineness 100%＜3000 μ, 80%＜650～1000 μ, 25～30%＜63 μ) enters the pump pond.Classification underflow behind hydroclone classification (coarse sand) all enters ball mill fine grinding (amount of solid of this moment is 2.5～3.5 times of ore amount that add rod mill), the best liquid-solid ratio of regulating in the mill with proper quantity of lye (80～90 ℃ of temperature) is 0.4～0.8, the ore pulp of discharging also enters same pump pond, and adding alkali lye (80～90 ℃ of temperature), make mixed ore pulp be contained in 470～520g/L admittedly, with the speed governing slush pump mixed ore pulp in pump pond is delivered to hydrocyclone and carry out classification (keeping stable feed pressure), classification efficiency is more than 80%.Wherein, (enter ball mill and regrind admittedly be contained in 1100～1250g/L), overflow is finished product ore pulp (admittedly being contained in 200～280g/L, fineness-63 μ 70% ± 5% ,-315 μ 98.75% ,-500 μ 100%) to underflow.
Claims (1)
1, a kind of two sections mill ore grinding-grading technologies of alumina pulp preparation, it is characterized in that: with bauxite, lime adds rod mill in 100: 7～9 ratios and roughly grinds, and adding proper quantity of lye, liquid-solid ratio is 0.4～0.8 in the control mill, the control slurry temperature is at 80～90 ℃, rough slurry fineness 100%＜3000 μ that grinds, 80%＜650～1000 μ, 25～30%＜63 μ enter the pump pond, classification underflow behind hydroclone classification all enters the ball mill fine grinding, the best liquid-solid ratio of regulating under 80～90 ℃ temperature in the mill with proper quantity of lye is 0.4～0.8, the ore pulp of discharging also enters same pump pond, and adds alkali lye control temperature at 80～90 ℃, makes mixed ore pulp be contained in 470～520g/L admittedly, with the speed governing slush pump mixed ore pulp in pump pond is delivered to hydrocyclone and carry out classification, classification efficiency is more than 80%; Wherein underflow enters ball mill and regrinds, and overflow is the finished product ore pulp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100223881A CN1314492C (en) | 2004-04-23 | 2004-04-23 | Two-stage grinding-classifying process for preparing alumina pulp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100223881A CN1314492C (en) | 2004-04-23 | 2004-04-23 | Two-stage grinding-classifying process for preparing alumina pulp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1569339A true CN1569339A (en) | 2005-01-26 |
| CN1314492C CN1314492C (en) | 2007-05-09 |
Family
ID=34480079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100223881A Expired - Fee Related CN1314492C (en) | 2004-04-23 | 2004-04-23 | Two-stage grinding-classifying process for preparing alumina pulp |
Country Status (1)
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| CN (1) | CN1314492C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100383046C (en) * | 2005-07-18 | 2008-04-23 | 贵阳铝镁设计研究院 | Technique for improving solid content of raw pulp |
| CN100395033C (en) * | 2005-12-23 | 2008-06-18 | 沈阳铝镁设计研究院 | Ore dressing and grinding process for alumyte |
| CN103101941A (en) * | 2011-11-14 | 2013-05-15 | 沈阳铝镁设计研究院有限公司 | Comprehensive energy-saving method for ore grinding, predesilicification and digestion procedures |
| CN105435942A (en) * | 2014-09-16 | 2016-03-30 | 沈阳铝镁设计研究院有限公司 | Bauxite coarse-fine separation grinding method |
| CN107522212A (en) * | 2016-06-22 | 2017-12-29 | 沈阳铝镁设计研究院有限公司 | A kind of large arch dam raw ore slurry preparation method of alumina producing Bayer process |
| CN110052321A (en) * | 2019-04-30 | 2019-07-26 | 湖南柿竹园有色金属有限责任公司 | A kind of two sections of Continuous Grinding grading technologies of non-standard configuration |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1049875C (en) * | 1996-11-15 | 2000-03-01 | 山西铝厂 | Primary mineral pulp preparation process in Baeyer's alumina producing process |
| RU2152904C2 (en) * | 1997-08-11 | 2000-07-20 | Акционерное общество "Алюминий Казахстана" | Method of preparing alumina from high-sulfur and high- carbonate bauxite |
| CN1224461C (en) * | 2002-09-28 | 2005-10-26 | 云南三环化工有限公司 | Multistage closed wet phosphate rock grinding process |
-
2004
- 2004-04-23 CN CNB2004100223881A patent/CN1314492C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100383046C (en) * | 2005-07-18 | 2008-04-23 | 贵阳铝镁设计研究院 | Technique for improving solid content of raw pulp |
| CN100395033C (en) * | 2005-12-23 | 2008-06-18 | 沈阳铝镁设计研究院 | Ore dressing and grinding process for alumyte |
| CN103101941A (en) * | 2011-11-14 | 2013-05-15 | 沈阳铝镁设计研究院有限公司 | Comprehensive energy-saving method for ore grinding, predesilicification and digestion procedures |
| CN105435942A (en) * | 2014-09-16 | 2016-03-30 | 沈阳铝镁设计研究院有限公司 | Bauxite coarse-fine separation grinding method |
| CN107522212A (en) * | 2016-06-22 | 2017-12-29 | 沈阳铝镁设计研究院有限公司 | A kind of large arch dam raw ore slurry preparation method of alumina producing Bayer process |
| CN110052321A (en) * | 2019-04-30 | 2019-07-26 | 湖南柿竹园有色金属有限责任公司 | A kind of two sections of Continuous Grinding grading technologies of non-standard configuration |
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| Publication number | Publication date |
|---|---|
| CN1314492C (en) | 2007-05-09 |
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: GUIYANG ALUMINUM AND MAGNESIUM DESIGN INSTITUTE CO Free format text: FORMER NAME: GUIYANG ALUMINIUM AND MAGNESIUM DESIGN INST. |
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| CP03 | Change of name, title or address |
Address after: 550081 Guiyang Province, Jinyang New District, Zhu Zhu Road, No. 2 Patentee after: Guiyang Aluminum & Magnesium Design Institute Co., Ltd. Address before: 550004 No. 208, Beijing Road, Guiyang, Guizhou Patentee before: Guiyang Aluminium and Magnesium Design Inst. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070509 Termination date: 20150423 |
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| EXPY | Termination of patent right or utility model |