Comprehensive utilization method of lead-zinc ore waste rock

A technology of lead-zinc ore and iron concentrate, which is applied in the field of mineral processing, can solve the problems of relying on the size of the surrounding building materials market, the limitation of lead-zinc ore waste rock consumption, and the low added value of building material products, so as to achieve low cost and resource utilization Efficient utilization, significant economic and social ecological benefits, promotion of oxidation and decomposition of sulfate

Pending Publication Date: 2022-04-19
CENT SOUTH UNIV
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Problems solved by technology

Although the use of lead-zinc tailings as building materials provides an important idea and approach for the mass consumption of lead-zinc ore waste rocks, due to the low added value of building material products and the small sales radius, it is heavily dependent on the scale of the surrounding building material market, resulting in the demand for lead-zinc mine tailings. The absorption of zinc ore waste rock is limited

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  • Comprehensive utilization method of lead-zinc ore waste rock

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Effect test

Embodiment 1

[0030] A kind of lead-zinc ore waste rock (26.92%CaO, 18.07%MgO, 1.91%S, 0.38%Zn, 0.05%Pb) is used for the method for preparing magnesium pellets, comprising the following steps:

[0031] S1: Use a jaw crusher and a dry ball mill to crush and grind the lead-zinc waste rock in sequence, and the -0.074mm content of the lead-zinc waste rock after fine grinding is 85%.

[0032] S2: High magnesium powder (82.53% MgO) is dry-type ball milled to -0.074mm content of 83.60%.

[0033] S3: Iron concentrate is hematite concentrate (64.53% Fe, 0.67% FeO, 1.28% SiO 2 , 0.086% CaO, 0.055% MgO, 0.014% S), magnetite concentrate A (64.67% Fe, 26.94% FeO, 8.30% SiO 2 , 0.23% CaO, 0.41% MgO, 0.006% S), magnetite concentrate B (66.16% Fe, 24.15% FeO, 3.49% SiO 2 , 0.52% CaO, 0.46% MgO, 0.083% S) and magnetite concentrate C (69.05% Fe, 28.68% FeO, 1.40% SiO 2 , 0.45% CaO, 0.68% MgO, the mixed iron concentrate of 0.160% S) composition; The hematite concentrate powder, magnetite concentrate A, mag...

Embodiment 2

[0037] A kind of lead-zinc ore waste rock (27.06%CaO, 18.15%MgO, 1.43%S, 0.29%Zn, 0.1%Pb) is used for the method for preparing magnesia pellets, comprising the following steps:

[0038] S1: Use a jaw crusher and a dry ball mill to crush and grind the lead-zinc waste rock in sequence, and the -0.074mm content of the lead-zinc waste rock after fine grinding is 85%.

[0039] S2: High-magnesium powder (82.53% MgO) and limestone (52.97% CaO) are dry ball milled to a content of 83.60% at -0.074mm.

[0040] S3: Iron concentrate is hematite concentrate (65.23% Fe, 0.91% FeO, 1.23% SiO 2 , 0.004% CaO, 0.039% MgO, 0.007% S), magnetite concentrate (69.65% Fe, 28.02% FeO, 1.57% SiO 2 , 0.11% CaO, 0.15% MgO, 0.023% S) and sulfuric acid slag (63.07% Fe, 3.16% SiO 2 , 0.73% CaO, 0.23% MgO) mixed iron concentrate, hematite concentrate powder, magnetite concentrate, and sulfuric acid slag are mixed in a ratio of 40:40:20, and water is added to adjust the water content of the mixed concentrat...

Embodiment 3

[0044] A kind of lead-zinc ore waste rock (27.06%CaO, 18.15%MgO, 1.43%S, 0.29%Zn, 0.1%Pb) is used for the method for preparing magnesia pellets, comprising the following steps:

[0045] S1: Use a jaw crusher and a dry ball mill to crush and grind the lead-zinc waste rock in sequence, and the -0.074mm content of the lead-zinc waste rock after fine grinding is 85%.

[0046] S2: High-magnesium powder (82.53% MgO) and limestone (52.97% CaO) are dry ball milled to a content of 83.60% at -0.074mm.

[0047] S3: Iron concentrate is hematite concentrate (65.23% Fe, 0.91% FeO, 1.23% SiO 2 , 0.004% CaO, 0.039% MgO, 0.007% S), magnetite concentrate (69.65% Fe, 28.02% FeO, 1.57% SiO 2 , 0.11% CaO, 0.15% MgO, 0.023% S) and sulfuric acid slag (63.07% Fe, 3.16% SiO 2 , 0.73% CaO, 0.23% MgO) mixed iron concentrate, hematite concentrate powder, magnetite concentrate, and sulfuric acid slag are mixed in a ratio of 40:40:20, and water is added to adjust the water content of the mixed concentrat...

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Abstract

The invention discloses a comprehensive utilization method of lead-zinc ore waste rock. The comprehensive utilization method comprises the following steps: S1, crushing the lead-zinc ore waste rock in advance, and finely grinding the lead-zinc ore waste rock to a certain particle size; s2, performing fine grinding on the conventional flux in advance to a proper particle size; s3, the iron ore concentrate is pretreated, so that the iron ore concentrate has a certain specific surface area; s4, ore blending and uniform mixing are conducted on the pretreated iron ore concentrate, a conventional flux, the lead-zinc ore waste rock obtained after fine grinding and a binder according to the set MgO content and binary alkalinity, a mixture is obtained, then water is added into the mixture in a disc pelletizer for pelletizing, and green pellets with the set granularity are obtained; and S5, the green pellets are loaded into special pellet production equipment, drying, preheating, roasting, soaking and cooling are conducted at the set air speed and temperature, and the finished product oxidized pellets are obtained. Based on the characteristic that the main phase of dolomite lead-zinc ore waste rock is dolomite, the dolomite lead-zinc ore waste rock is crushed and finely ground to serve as the magnesium-containing flux to replace part of conventional metallurgical dolomite to prepare magnesium pellets, and therefore recycling of valuable components such as calcium and magnesium in the waste rock is achieved.

Description

technical field [0001] The invention belongs to the field of mineral processing, and in particular relates to a comprehensive utilization method of lead-zinc ore waste rock. Background technique [0002] In the beneficiation process of lead-zinc ore, the raw ore is usually pre-selected and discarded to improve the grade of the selected raw ore in the subsequent process, and it is also conducive to reducing the output of tailings and reducing the pressure on tailings inventory. However, what follows is the disposal and utilization of a large number of lead-zinc ore waste rocks. Lead-zinc ore waste rocks are typical mining solid wastes. According to the Law on the Prevention and Control of Solid Waste Pollution, “mining enterprises should adopt scientific mining methods and beneficiation techniques to reduce the production and production of tailings, waste rocks and other mining solid waste. storage capacity; the state encourages the adoption of advanced technology for the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243C22B1/16
CPCC22B1/2406C22B1/243C22B1/16Y02P10/20
Inventor 杨聪聪朱德庆潘建李启厚夏光辉郭正启李思唯
Owner CENT SOUTH UNIV
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