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Method for resource utilization of lead-zinc ore waste rocks

A lead-zinc mine and resource-based technology, applied in the field of mineral processing, can solve the problems of high cost, difficulty in crushing and grinding, and lack of market competitiveness, and achieve low production cost, large production scale, and significant social and ecological benefits. Effect

Pending Publication Date: 2022-04-29
GUANGXI ZHONGJIN LINGNAN MINING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since lead-zinc ore waste rocks are mostly hard rocks with large particle sizes, it is difficult to crush and grind them, so the product cost is high, and they do not have market competitiveness, and the harmful elements in them are treated in a harmless manner.

Method used

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  • Method for resource utilization of lead-zinc ore waste rocks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing low-quality dolomite from lead-zinc ore waste rock (27.06% CaO, 18.15% MgO, 1.43% S, 0.29% Zn, 0.1% Pb) for iron ore sintering production, comprising the following steps:

[0025] The first step: preparation of low-quality dolomite

[0026] A jaw crusher is used to crush the lead-zinc ore waste rock, and the low-quality dolomite obtained after crushing has a particle size of -3mm and a content of 58.81%.

[0027] The second step: ore blending

[0028] The proportions of iron ore powder, limestone, dolomite, low-quality dolomite (prepared in the first step), quicklime, coke powder, and returned ore are 58.83%, 6.89%, 2.39%, 1.71%, 3.00%, and 4.10%, respectively , 23.08%, the fixed sinter basicity is 1.95, in the mixed material: SiO 2 The MgO content is 5.5%, and the MgO content is 1.8%. The low-quality dolomite obtained from waste rock crushing is used to replace 40% of the traditional dolomite for sintering, and the moisture content of the mixtu...

Embodiment 2

[0037] A method for preparing low-quality dolomite from lead-zinc ore waste rock (27.06% CaO, 18.15% MgO, 1.43% S, 0.29% Zn, 0.1% Pb) for iron ore sintering production, comprising the following steps:

[0038] The first step: preparation of low-quality dolomite

[0039] Jaw crushers and roller crushers are used to crush lead-zinc ore waste rocks, and the low-quality dolomite obtained after crushing has a particle size of -3mm and a content of 100%.

[0040] The second step: ore blending

[0041] The proportions of iron ore powder, limestone, dolomite, low-quality dolomite (prepared in the first step), quicklime, coke powder, and returned ore are 58.83%, 6.89%, 2.39%, 1.71%, 3.00%, and 4.10%, respectively , 23.08%, fixed sinter basicity is 1.95, SiO in raw materials 2 The MgO content is 5.5%, and the MgO content is 1.8%. The low-quality dolomite obtained from waste rock crushing is used to replace 40% of the traditional dolomite for sintering, and the moisture content of the ...

Embodiment 3

[0050] A method for preparing low-quality dolomite from lead-zinc ore waste rock (27.06% CaO, 18.15% MgO, 1.43% S, 0.29% Zn, 0.1% Pb) for iron ore sintering production, comprising the following steps:

[0051] The first step: preparation of low-quality dolomite

[0052] The lead-zinc ore waste rock is crushed by a jaw crusher, and the low-quality dolomite obtained after crushing has a particle size of -3mm and a content of 83.49%.

[0053] The second step: ore blending

[0054] The proportions of iron ore powder, limestone, dolomite, low-quality dolomite (prepared in the first step), quicklime, coke powder, and returned ore are 58.67%, 7.00%, 1.60%, 2.55%, 3.00%, and 4.10%, respectively , 23.08%, fixed sinter basicity is 1.95, SiO in raw materials 2 The MgO content is 5.5%, and the MgO content is 1.8%. The low-quality dolomite obtained by crushing waste rock is used to replace 60% of the traditional dolomite for sintering, and the moisture content of the mixture is 8.5%.

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Abstract

The invention discloses a lead-zinc ore waste rock resource utilization method which comprises the following steps: S1, crushing lead-zinc ore waste rock to obtain low-quality dolomite; or roasting the lead-zinc ore waste rock, and crushing after roasting to obtain low-weight light-burned dolomite; s2, blending the iron ore powder, return mine, a flux and coke powder to obtain a sintering raw material; wherein the flux contains low-quality dolomite or low-quality light-burned dolomite; s3, uniformly mixing the sintering raw materials to obtain a uniformly premixed material; s4, granulating the mixture to obtain a granulated material; and S5, distributing, igniting and sintering the granulated material in a sintering cup, and then cooling, crushing and screening to obtain the finished product sintered ore. According to the method, the lead-zinc ore waste rock is used for preparing the dolomite and light-burned dolomite products for sintering, the low-quality dolomite can be prepared only through mechanical crushing, or the low-quality light-burned dolomite can be fired through a conventional roasting process, the technological process is simple, the production cost is low, and high technical and economic feasibility is achieved.

Description

technical field [0001] The invention belongs to the field of mineral processing, and in particular relates to a method for resource utilization of lead-zinc ore waste rock. Background technique [0002] my country's lead-zinc ore resources are mainly lean ores with a lead and zinc grade of about 3% to 8%, and there are many co-associated components. In order to reduce the amount of subsequent mineral processing and reduce the cost of grinding, it has become the first choice for lead-zinc mineral processing to throw out most of the waste rock from the raw ore in the crushing section in advance, and the discarding rate can reach 20% to 60%. % or so, the output of waste rock is huge. According to the "Solid Waste Pollution Prevention and Control Law", waste rocks of lead-zinc mines are typical solid wastes, and it is required that "mining enterprises should adopt scientific mining methods and mineral processing techniques to reduce the production of tailings, waste rocks and o...

Claims

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Application Information

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IPC IPC(8): C22B1/24C22B1/20
CPCC22B1/2406C22B1/20
Inventor 李小元杨聪聪何晋勇朱德庆刘兵潘建钟旭群郭正启苏振华王欣谈承忠
Owner GUANGXI ZHONGJIN LINGNAN MINING CO LTD
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