CN102125888A - Fine grinding and sorting method for fine-particle iron ore - Google Patents
Fine grinding and sorting method for fine-particle iron ore Download PDFInfo
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- CN102125888A CN102125888A CN 201010558282 CN201010558282A CN102125888A CN 102125888 A CN102125888 A CN 102125888A CN 201010558282 CN201010558282 CN 201010558282 CN 201010558282 A CN201010558282 A CN 201010558282A CN 102125888 A CN102125888 A CN 102125888A
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Abstract
The invention relates to an iron ore dressing method, and particularly discloses a fine grinding and sorting method for micro-fine iron ore, which comprises the following steps: firstly, preparing the fine particle iron ore into ore pulp with the mass concentration of 30-70%, then sending the ore pulp into a vertical stirring mill for fine grinding, discharging the fine ground ore into a fine particle classifier for classification, returning the classification bottom flow to size mixing, then sending the classification bottom flow into the vertical stirring mill for fine grinding, and performing magnetic separation or magnetic suspension combined separation on the classification overflow to obtain iron ore concentrate. The method of the invention is adopted to carry out fine grinding and sorting on the fine particle iron ore, which can obviously improve the grade and the recovery rate of the iron ore concentrate and reduce the ore dressing cost.
Description
Technical field
The present invention relates to a kind of mineral processing method of iron ore, relate in particular to a kind of fine grinding method for separating of microfine iron ore.
Background technology
China can be poor, thin, assorted for the mineral resources trend of development and use, and the microfine refractory iron ore accounts for 20%～25% of China's iron ore deposit reserves, and as Taiyuan Iron and Steel Co. Yuan Jia village, Shanxi iron ore, its magnetic iron ore disseminated grain size-37 μ m is greater than 95%; Qidong, Hunan iron ore, hole iron ore disseminated grain size are that-20 μ m are greater than 98% or thinner.And high-phosphorus hematite leaved for development, its disseminated grain size even reached 15 μ m greater than 90%.Such ore mineral disseminated grain size is fine, complex structure, the ore dressing difficulty is very big, it generally needs through stage grinding---stage grading could obtain qualified iron ore concentrate, and to obtain the iron ore concentrate of high-grade and high-recovery, then must could realize fully dissociating of iron mineral, to improve the grade and the rate of recovery of iron ore concentrate by its coarse grained abrasive being carried out fine grinding (even ultra-fine mill).
Present mine industry all adopts common horizontal ball mill as microfine iron ore coarse grained abrasive fine grinding equipment, when fine-particle minerals dissociates granularity during less than 45 μ m, owing to limited by its architectural feature and stress mode, cause common horizontal ball mill in the mineral fine grinding is used, to have the following disadvantages: 1) to be difficult to realize the refinement of micro-size fraction mineral and dissociate; 2) when mog reaches mineral and dissociates size, the easy argillization of valuable mineral causes the valuable mineral loss; 3) fine grinding process energy consumption height.As seen, no matter from energy consumption still from the mineral angle analysis that dissociates, common horizontal ball mill all can not obtain promising result.Therefore, exploitation is efficient, low consumption and help the beneficiation method that mineral dissociate, with obtain narrow particle size distribution, classification overflow that dissociation degree is high just seems extremely important.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art, provides a kind of and can obtain high grade iron concentrate, and can significantly reduce the fine grinding method for separating of the microfine iron ore of fine grinding cost and energy consumption.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is a kind of fine grinding method for separating of microfine iron ore, may further comprise the steps: at first, the microfine iron ore is modulated to the ore pulp of mass concentration 30%～70%, send into vertical agitator mill then and carry out fine grinding (wet grinding), discharging enters the microfine clasfficiator and carries out classification after the fine grinding, and classification underflow returns and reenters vertical agitator mill fine grinding, and the classification overflow obtains iron ore concentrate after through magnetic separation or the floating combined sorting of magnetic.
In the fine grinding method for separating of above-mentioned microfine iron ore, described microfine iron ore is preferably the mixing ore deposit of one or more compositions in magnetic iron ore, bloodstone, the limonite, the granularity D of described microfine iron ore
80Be 40 μ m～125 μ m.From raw material sources, described microfine iron ore can be rough concentrate, concentrate, chats or mine tailing.
In the fine grinding method for separating of above-mentioned microfine iron ore, the rotating speed of described vertical agitator mill preferably is controlled at 30 r/min～1500 r/min, and the agitator type of described vertical agitator mill is preferably disc type, bar type, spiral or combination form agitator.
In the fine grinding method for separating of above-mentioned microfine iron ore, the ball-milling medium that described fine grinding is selected for use is preferably steel ball, porcelain ball or gravel, and the charging quantity of described ball-milling medium is preferably 1/2～2/3 of described vertical agitator mill cylindrical shell volume; The particle diameter of described ball-milling medium is preferably 3mm～30mm.
In the fine grinding method for separating of above-mentioned microfine iron ore, described microfine clasfficiator preferably adopts cyclone or centrifugal classifying.Described classification process can carry out single or multiple, and the granularity of controlling described classification overflow is D
8010 μ m～76 μ m.
The main feature of technique scheme of the present invention is: adopt based on the vertical agitator mill equipment of shearing/friction force mechanism the microfine iron ore is implemented fine grinding, and by follow-up classifying equipoment control grinding particle size, form the closed circuit grinding technological process, obtain D
80Be 10 μ m～76 μ m, liberation degree of minerals height and be easy to magnetic separation or the classification overflow of the floating combined sorting of magnetic, at last through obtaining high-grade, high-recovery iron ore concentrate behind magnetic separation or the floating combined sorting of magnetic.
Compared with prior art, the invention has the advantages that: the present invention will be used for the fine grinding of microfine iron ore based on the vertical agitator mill of shearing/friction force mechanism, and by the rotating speed of regulating vertical agitator mill, the size of control ball-milling medium, improved the liberation degree of minerals of microfine iron ore greatly, make iron mineral realize dissociating, and obtain the iron extract mine producation of high-grade, high-recovery by follow-up magnetic separation or the floating combined sorting of magnetic at boundary.In addition, the equipment that beneficiation method of the present invention adopted is simple, less investment, can significantly reduce fine grinding cost and energy consumption, improves efficiency of energy utilization.
Description of drawings
Fig. 1 is the process chart of the fine grinding method for separating of microfine iron ore of the present invention.
The specific embodiment
Below in conjunction with specific embodiment and accompanying drawing the present invention is further described.
Embodiment 1
A kind of fine grinding method for separating of microfine iron ore of the present invention as shown in Figure 1, may further comprise the steps: at first, with Hunan microfine iron ore (it is a magnetic iron ore and the ore deposit of mixing of bloodstone, and based on magnetic iron ore) rough concentrate (this rough concentrate iron grade 36%, granularity D
80Be 84 μ m) to be hybridly prepared into mass concentration with water be 60% ore pulp, make ore pulp carry out the fine grinding of vertical agitator mill by batcher (or head tank etc.) from flowing into vertical agitator mill (this vertical agitator mill adopts the bar type agitator), fill the steel ball of diameter 6mm～12mm in the vertical agitator mill, charging quantity is 2/3 of a vertical agitator mill cylindrical shell volume, rotating speed when vertical agitator mill is worked is controlled at 250r/min, discharging stirred and pump into hydrocyclone carry out classification, classification underflow and ore pulp carry out vertical agitator mill fine grinding after merging again, and the classification overflow then enters follow-up magnetic concentration working as the fine grinding product; Classification overflow granularity D
80Be 32 μ m, after magnetic separator magnetic field intensity 80mT, 60mT, 60mT one thick two smart twice magnetic separation, obtain grade and be 63%, the iron ore concentrate of magnetic separation overall recovery 89%.
Embodiment 2
A kind of fine grinding method for separating of microfine iron ore of the present invention as shown in Figure 1 may further comprise the steps: at first, and with anti-floating mine tailing (this anti-floating tailings grade 29%, the granularity D of packet header microfine iron ore (it is main for magnetic iron ore)
80Be 100 μ m) to be hybridly prepared into mass concentration with water be 65% ore pulp, make ore pulp carry out fine grinding by head tank from flowing into vertical agitator mill (this vertical agitator mill adopts disc mixer), fill the steel ball of 20mm～30mm in the grinding machine, charging quantity is 2/3 of a vertical agitator mill cylindrical shell volume, rotating speed when vertical agitator mill is worked is controlled at 400r/min, discharging pump is gone into the waterpower cyclone carry out classification, again carry out the fine grinding of vertical mixer after classification underflow and ore pulp merge, the classification overflow then enters follow-up magnetic concentration working as the fine grinding product; Classification overflow granularity D
80Be 36 μ m.After magnetic separator 80mT, 60mT, 60mT one thick two smart twice magnetic separation, obtain grade and be 66%, the iron ore concentrate of magnetic separation overall recovery 63%, productive rate 30%.
Embodiment 3
A kind of fine grinding method for separating of microfine iron ore of the present invention as shown in Figure 1 may further comprise the steps: at first, and with rough concentrate (the granularity D of Xinjiang fine grain teeth cloth iron ore (it is a magnetic iron ore and the ore deposit of mixing of bloodstone, and based on magnetic iron ore)
80Be 60 μ m) to be mixed with mass concentration be 65% ore pulp, make ore pulp pump into vertical agitator mill (agitator of this vertical agitator mill adopts spiral agitator) and carry out fine grinding, fill the steel ball of 15mm～25mm in the vertical agitator mill, charging quantity is 2/3 of a vertical agitator mill cylindrical shell volume, rotating speed during vertical stirring ball-milling is controlled at 120r/min, discharging is stirred, and pump into centrifugal classifying and carry out classification, classification underflow and ore pulp carry out vertical agitator mill after merging again, and the classification overflow then enters the floating combined sorting operation of follow-up magnetic as the fine grinding product; Classification overflow granularity D
80Be 20 μ m, through twice magnetic separation (magnetic field intensity 150mT) and reverse flotation sorting, obtain grade and be 64%, the iron ore concentrate of operation recovery 69%, overall recovery 55%.
Claims (5)
1. the fine grinding method for separating of a microfine iron ore, may further comprise the steps: at first, the microfine iron ore is modulated to the ore pulp of mass concentration 30%～70%, send into vertical agitator mill then and carry out fine grinding, discharging enters the microfine clasfficiator and carries out classification after the fine grinding, classification underflow returns to size mixing and reenters vertical agitator mill fine grinding, obtains iron ore concentrate behind the floating combined sorting of classification overflow process magnetic separation or magnetic.
2. the fine grinding method for separating of microfine iron ore according to claim 1 is characterized in that: described microfine iron ore is the mixing ore deposit of one or more compositions in magnetic iron ore, bloodstone, the limonite, described microfine iron ore granularity D
80Be 40 μ m～125 μ m.
3. the fine grinding method for separating of microfine iron ore according to claim 1, it is characterized in that: the rotating speed of described vertical agitator mill is controlled at 30 r/min～1500 r/min, and the agitator type of described vertical agitator mill is disc type, bar type, spiral or combination form agitator.
4. the fine grinding method for separating of microfine iron ore according to claim 3 is characterized in that: the ball-milling medium that described fine grinding is used is steel ball, porcelain ball or gravel, and the charging quantity of described ball-milling medium is 1/2～2/3 of a described vertical agitator mill cylindrical shell volume; The particle diameter of described ball-milling medium is 3mm～30mm.
5. the fine grinding method for separating of microfine iron ore according to claim 1 is characterized in that: described microfine clasfficiator is cyclone or centrifugal classifying, and the granularity of controlling described classification overflow is D
8010 μ m～76 μ m.
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| CN 201010558282 CN102125888A (en) | 2010-11-25 | 2010-11-25 | Fine grinding and sorting method for fine-particle iron ore |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103028481A (en) * | 2012-11-30 | 2013-04-10 | 华南理工大学 | Method for pretreating solid inclusion impurities in quartz floating |
| CN103111361A (en) * | 2013-02-28 | 2013-05-22 | 贵州开磷（集团）有限责任公司 | Secondary phosphoric ore pulp cyclone separation process |
| CN105214830A (en) * | 2015-11-09 | 2016-01-06 | 攀钢集团矿业有限公司 | Magnetic mineral stage division |
| CN105498929A (en) * | 2016-01-05 | 2016-04-20 | 马钢(集团)控股有限公司 | Magnetite concentrate quality-improving and impurity-reducing technology and device |
| CN107812590A (en) * | 2016-09-14 | 2018-03-20 | 中国地质科学院矿产综合利用研究所 | Selective dissociation strengthening separation method for fine particles difficult to separate |
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| CN86107769A (en) * | 1986-11-13 | 1988-05-25 | 范昌海 | Valuable mineral selective milling and stage grading process |
| CN1548234A (en) * | 2003-05-23 | 2004-11-24 | 鞍钢集团鞍山矿业公司研究所 | Ore dressing process of treating poor hematite |
| CN101708481A (en) * | 2008-10-31 | 2010-05-19 | 鞍钢集团矿业公司 | Additional grading technology for spiral chute roughing tailings |
| CN101850295A (en) * | 2010-05-06 | 2010-10-06 | 中钢集团马鞍山矿山研究院有限公司 | Beneficiation method for producing high-quality iron ore concentrate by low-grade magnetic iron ore |
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2010
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| CN101708481A (en) * | 2008-10-31 | 2010-05-19 | 鞍钢集团矿业公司 | Additional grading technology for spiral chute roughing tailings |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103028481A (en) * | 2012-11-30 | 2013-04-10 | 华南理工大学 | Method for pretreating solid inclusion impurities in quartz floating |
| CN103028481B (en) * | 2012-11-30 | 2014-12-03 | 华南理工大学 | Method for pretreating solid inclusion impurities in quartz floating |
| CN103111361A (en) * | 2013-02-28 | 2013-05-22 | 贵州开磷（集团）有限责任公司 | Secondary phosphoric ore pulp cyclone separation process |
| CN103111361B (en) * | 2013-02-28 | 2015-09-09 | 贵州开磷集团股份有限公司 | A kind of secondary phosphoric ore pulp cyclone separating technology |
| CN105214830A (en) * | 2015-11-09 | 2016-01-06 | 攀钢集团矿业有限公司 | Magnetic mineral stage division |
| CN105498929A (en) * | 2016-01-05 | 2016-04-20 | 马钢(集团)控股有限公司 | Magnetite concentrate quality-improving and impurity-reducing technology and device |
| CN107812590A (en) * | 2016-09-14 | 2018-03-20 | 中国地质科学院矿产综合利用研究所 | Selective dissociation strengthening separation method for fine particles difficult to separate |
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Application publication date: 20110720 |