CN103861711B - The grinding process of semi-autogenous mill - Google Patents

The grinding process of semi-autogenous mill Download PDF

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Publication number
CN103861711B
CN103861711B CN201410124484.0A CN201410124484A CN103861711B CN 103861711 B CN103861711 B CN 103861711B CN 201410124484 A CN201410124484 A CN 201410124484A CN 103861711 B CN103861711 B CN 103861711B
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grade
semi
grinding
autogenous
autogenous mill
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CN103861711A (en
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胡新付
汪太平
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Tongling Nonferrous Metals Group Co Ltd
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Tongling Nonferrous Metals Group Co Ltd
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Abstract

The invention discloses the grinding process of semi-autogenous mill, it comprises: the relief hole of semi-autogenous mill controls at below 80mm by (1), draws the material of below 80mm grade in discharge; (2) double deck screen is set outside relief hole, the stock grading of 30-80mm, 30-2.5mm and below 2.5mm grade is drawn respectively; (3) the material belt of 30-80mm grade to be caused in next operation chats ore grinding as milling medium, the material of 30-2.5mm grade is returned semi-autogenous mill circulation and regrind, the material of below 2.5mm grade is caused corase grind.The invention has the beneficial effects as follows by control semi-autogenous mill relief hole size and discharge the material of below 80mm grade and the material sieving out 30-80mm grade through double deck screen as the milling medium in next operation chats Grinding procedure, both solve Semi-Autogenous irrationality problem, additionally reduce the steel ball dielectric dissipation of grinding operation.

Description

The grinding process of semi-autogenous mill
Technical field
The present invention relates to grinding process, particularly relate to the grinding process of semi-autogenous mill.
Background technology
The maximum feature of autogenous tumbling mill the raw ore from stope or the ore etc. through coarse crushing directly can be fed grinding machine.Usual mineral feed grinding machine autogenous grinding by certain grain grade proportion.Material once can be ground into its content of-0.074mm and account for more than 20% ~ 50% of product population by autogenous tumbling mill.Comminution ratio can reach 4000 ~ 5000, higher tens times than ball, rod mill.Autogenous tumbling mill is a kind of novel grinding attachment having fragmentation and grinding two kinds of functions concurrently.It utilizes grinding charge material certainly as medium, and realize pulverizing by mutual impact and ablation, therefore autogenous tumbling mill gains the name.Autogenous tumbling mill is also called autogenous mill.Rubbing miner process is different, and autogenous tumbling mill can be divided into dry type (gas fall formula) and wet type (rushing down formula) two kinds.Current China is widely used is wet autogenous mill.
Autogenous tumbling mill has speed change and different capacity to determine rotating speed two kinds of driving styles, and some autogenous tumbling mills are also equipped with inching gear.Cylindrical shell jacking system is equipped with for ease of maintenance; For large-sized grinder, for eliminating Static resistance moment when starting, have employed the modern advanced such as hydrostatic bearing, to guarantee that autogenous tumbling mill can safe handling.
Semi-Autogenously in autogenous tumbling mill, add a small amount of steel ball (being generally 2-8%) exactly, its result treatment ability can improve 10-30%, and the energy consumption of unit product reduces 10-20%, but wear liner increases by 15% relatively, and product fineness is also more thicker.
Semi-autogenous mill is synchronous machine drives, motor drives barrel to rotate by the transmission of driving section, when barrel body rotation, be contained in abrasive media-steel ball in cylindrical shell and nugget under the effect of frictional force and centrifugal force, certain altitude is thus lifted to along with cylindrical shell revolution, then left according to certain linear velocity, ore is by the shock of whereabouts steel ball and the additional crushing between steel ball and steel ball and between steel ball and grinding machine and nugget and grind stripping effect and pulverized, and the qualified material be grated is sent outside cylindrical shell by means of the impulse force of water.
The middling ore regrinding of the current mine ore dressing of China uses steel ball as milling medium poor effect, is difficult to effectively fully monomer dissociation.
Chinese invention patent application numbers 201210032756.5 discloses " a kind of grinding process of magnesite ", raw ore enters autogenous tumbling mill or semi-autogenous mill ore grinding after coarse crushing, autogenous tumbling mill is back to or semi-autogenous mill is regrinded after ore pulp classification after ore grinding, only be the reduction of steel ball number, and the problem that the loss of unresolved semi-autogenous mill liner plate is large, equipment life is short, metal loss is large.
Summary of the invention
The technical problem to be solved in the present invention is drawn by the hard rock of this difficult mill of the material of the 30-80mm grade in existing semi-autogenous mill, thus the liner plate loss being conducive to solving body is large, the service life of equipment, the problems such as equipment operation rate is low, metal loss is large, provide a kind of grinding process of semi-autogenous mill for this reason.
Technical scheme of the present invention is: the grinding process of semi-autogenous mill, and it comprises the following steps: (1), control at below 80mm by the relief hole of semi-autogenous mill, draws the material of below 80mm grade in discharge; (2), outside relief hole double deck screen is set, the stock grading of 30-80mm, 30-2.5mm and below 2.5mm grade is drawn respectively; (3), using the material belt of 30-80mm grade to cause in next operation middling ore regrinding ore grinding as milling medium, the material of 30-2.5mm grade is returned semi-autogenous mill and recycles, the material of below 2.5mm grade is caused corase grind.
The invention has the beneficial effects as follows by control Semi-Autogenous relief hole size the material of below 80mm grade in semi-autogenous mill drawn and the material sifting out 30-80mm grade through double-deck screen shale shaker as the milling medium in next chats Grinding procedure, instead of original steel ball milling medium, both Semi-Autogenous liner plate loss had been solved large, the service life of equipment, the problems such as equipment operation rate is low, metal loss is large, additionally reduce the steel ball dielectric dissipation of chats grinding operation; Improve the grinding efficiency of Regrinding, reduce overground argillization; Avoid Regrinding steel ball to form Fe (OH) 3 at mineral surfaces, be conducive to the rate of recovery improving accompaning goldsilver.
Detailed description of the invention
Embodiment 1:(1), the relief hole of semi-autogenous mill is controlled at below 80mm, draw the material of 80mm grade in discharge; (2), outside relief hole double deck screen is set, the stock grading of 30-80mm, 30-2.5mm and below 2.5mm grade is drawn respectively; (3), using the material belt of 30mm grade to cause in next operation chats ore grinding as milling medium, the material of 30-2.5mm grade is returned semi-autogenous mill and recycles, the material of below 2.5mm grade is caused corase grind.
Embodiment 2:(1), the relief hole of semi-autogenous mill is controlled at below 80mm, draw the material of 80mm grade in discharge; (2), outside relief hole double deck screen is set, the stock grading of 30-80mm, 30-2.5mm and below 2.5mm grade is drawn respectively; (3), using the material belt of 80mm grade to cause in next operation chats ore grinding as milling medium, the material of 30-2.5mm grade is returned semi-autogenous mill and recycles, the material of below 2.5mm grade is caused corase grind.
Core of the present invention is creationary the milling medium of the material of the 30-80mm grade in semi-autogenous mill discharge for lower road chats Grinding procedure, instead of traditional steel ball milling medium, and the material grinding efficiency of 30-80mm grade is equal to the steel ball of 20-60mm particle diameter, may be used for the milling medium of next operation in ore grinding, be mainly used for coarse concentrate regrinding or middling ore regrinding, most importantly for middling ore regrinding.The benefit done like this extracts in semi-autogenous mill the material being difficult to broken 30-80mm grade on the one hand, avoids damaging liner plate, make the material of the 30-80mm grade of taking-up be applied to lower road Grinding procedure as milling medium on the other hand, decrease the consumption of steel ball.
The present invention is mainly applicable to the carse, medium and small misproportion dissemination of valuable mineral, has corase grind and Regrinding in grinding process flow process.
Above in conjunction with the embodiments to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.

Claims (1)

1. the grinding process of semi-autogenous mill, is characterized in that it comprises the following steps: (1), control at 80mm by the relief hole of semi-autogenous mill, draws the material of below 80mm grade in discharge; (2), outside relief hole arrange double deck screen, classification obtains the material of 30-80mm, 30-2.5mm and below 2.5mm grade and draws respectively; (3), using the material belt of 30-80mm grade to cause in next operation chats ore grinding as milling medium, the material of 30-2.5mm grade is returned semi-autogenous mill circulation and regrind, the material of below 2.5mm grade is caused corase grind.
CN201410124484.0A 2014-03-31 2014-03-31 The grinding process of semi-autogenous mill Active CN103861711B (en)

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CN103861711B true CN103861711B (en) 2015-11-18

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105665081A (en) * 2016-05-05 2016-06-15 江西理工大学 Ore grinding technology for replacing vertical mill steel ball with semi-autogenous grinding hard rock
CN105944800B (en) * 2016-05-17 2018-11-13 中国瑞林工程技术有限公司 A kind of grinding process production method for making milling medium using hard rock
CN111298906B (en) * 2019-12-19 2022-04-22 安徽东巨新型建材有限公司 Steel slag-based filling material levigating method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5033682A (en) * 1987-10-20 1991-07-23 Ici Australia Operations Propreitary Limited Grinding process
CN2910356Y (en) * 2006-02-16 2007-06-13 中国恩菲工程技术有限公司 Semi-self-grinding ball mill for ores
CN101491789A (en) * 2009-02-12 2009-07-29 中国瑞林工程技术有限公司 Beneficiation process of mixed dregs using three copper smelting methods of flash smelting furnace, revolving furnace and depletion electric furnace
CN101507942A (en) * 2009-03-12 2009-08-19 中信重工机械股份有限公司 Detachable double-layer self-return screen of large-size autogenous mill
CN103357491A (en) * 2013-08-08 2013-10-23 中冶北方(大连)工程技术有限公司 Automatic hard rock returning device with semi-automatic grinding machine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100486167B1 (en) * 2004-12-17 2005-04-29 정규성 System for crushing and grinding of matter construction waste and ore

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5033682A (en) * 1987-10-20 1991-07-23 Ici Australia Operations Propreitary Limited Grinding process
CN2910356Y (en) * 2006-02-16 2007-06-13 中国恩菲工程技术有限公司 Semi-self-grinding ball mill for ores
CN101491789A (en) * 2009-02-12 2009-07-29 中国瑞林工程技术有限公司 Beneficiation process of mixed dregs using three copper smelting methods of flash smelting furnace, revolving furnace and depletion electric furnace
CN101507942A (en) * 2009-03-12 2009-08-19 中信重工机械股份有限公司 Detachable double-layer self-return screen of large-size autogenous mill
CN103357491A (en) * 2013-08-08 2013-10-23 中冶北方(大连)工程技术有限公司 Automatic hard rock returning device with semi-automatic grinding machine

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