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A system and method for grinding and magnetically separating copper slag

A technology for grinding, magnetic separation, and copper slag, applied in the direction of improving process efficiency, can solve the problems of low iron concentrate grade, high operating cost, high environmental protection cost, and achieve high grade, reduce energy consumption, and good reduction effect. Effect

Active Publication Date: 2018-02-09
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The processing of copper slag by mineral processing can recover a certain amount of iron ore concentrate, but the grade of the obtained iron ore concentrate is low, most of the tailings cannot be used, and the overall resource utilization level is low
Pyrochemical treatment of copper slag has the disadvantages of high energy consumption, complex process equipment, and high operating costs due to high temperature treatment
A large amount of acid-base solution is involved in the process of wet treatment of copper slag, which causes secondary pollution and high environmental protection costs

Method used

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  • A system and method for grinding and magnetically separating copper slag
  • A system and method for grinding and magnetically separating copper slag
  • A system and method for grinding and magnetically separating copper slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Finely grind 100 parts of copper slag, 20 parts of reduced coal (mass content of C: 82.06%), 8 parts of additives (limestone) until particle size ≤ 200 mesh accounts for 86.35%, and mix with 5 parts of binder to make pellets , enter from the feed port of the rotary hearth furnace, the reduction temperature of the rotary hearth furnace is 1280°C, the pre-reduction layer rotates for 35 minutes, and the reduction layer rotates for 45 minutes, and the pellets pass through the pre-reduction layer and the reduction layer respectively from the discharge port of the rotary hearth furnace Exhaust, collect the flue gas discharged from the rotary hearth furnace to obtain zinc-rich dust, water-quench and crush the metallized pellets discharged from the rotary hearth furnace, and grind them until the particle size is ≤ 200 mesh. The particle size accounts for 81.36% of the mass. Iron powder.

Embodiment 2

[0064] Finely grind 100 parts of copper slag, 30 parts of reduced coal (mass content of C: 81.58%), 5 parts of additives (limestone) until particle size ≤ 200 mesh accounts for 88.59%, and mix with 10 parts of binder to make pellets , enter from the feed port of the rotary hearth furnace, the reduction temperature of the rotary hearth furnace is 1200°C, the pre-reduction layer rotates for 20 minutes, and the reduction layer rotates for 60 minutes, and the pellets pass through the pre-reduction layer and the reduction layer respectively from the discharge port of the rotary hearth furnace Exhaust, collect the flue gas discharged from the rotary hearth furnace to obtain zinc-rich dust, water-quench and crush the metallized pellets discharged from the rotary hearth furnace, and grind them until the particle size is ≤ 200 mesh. The particle size accounts for 82.38% of the mass. Iron powder.

Embodiment 3

[0066] Finely grind 100 parts of copper slag, 25 parts of reduced coal (mass content of C: 83.58%), 10 parts of additive (limestone) until particle size ≤ 200 mesh accounts for 87.49%, and mix with 8 parts of binder to make pellets , from the feed port of the rotary hearth furnace, the reduction temperature of the rotary hearth furnace is 1350°C, the pre-reduction layer rotates for 50 minutes, and the reduction layer rotates for 30 minutes, and the pellets pass through the pre-reduction layer and the reduction layer respectively from the discharge port of the rotary hearth furnace Exhaust, collect the flue gas discharged from the rotary hearth furnace to obtain zinc-rich dust, water-quench and crush the metallized pellets discharged from the rotary hearth furnace, and grind them until the particle size is ≤ 200 mesh. The particle size accounts for 82.35% of the mass. Iron powder.

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Abstract

The invention discloses a system and method for treating copper slag through ore grinding and magnetic separation. The system comprises a rotary hearth furnace and ore grinding and magnetic separation equipment. The rotary hearth furnace comprises a feed inlet, a discharge outlet, an exhaust gas outlet, a pre-reduction layer and a reduction layer, wherein the pre-reduction layer is installed in a furnace body of the rotary hearth furnace and located above the reduction layer; the pre-reduction layer is of an open loop structure and is provided with a head end and a tail end, and a gap is reserved between the head end and the tail end in the horizontal direction; and the reduction layer is formed by building refractory materials and laid on the bottom of the rotary hearth furnace. According to the system and method for treating copper slag through ore grinding and magnetic separation, pre-reduction and reduction of pellets are carried out in the rotary hearth furnace, and the reduction effect is good; zinc-rich dust is obtained by collecting generated exhaust gas, and iron and zinc in copper slag are recovered simultaneously; and the system is simple, and the treatment capacity of the rotary hearth furnace is high.

Description

technical field [0001] The invention belongs to the field of waste utilization, in particular to a system and method for ore grinding and magnetic separation treatment of copper slag. Background technique [0002] Precious metal resources are scarce and expensive, and more and more countries around the world pay more and more attention to them. Precious metal industrial waste is a very valuable secondary resource among the precious metal resources that are increasingly scarce in the world today. Effective treatment and utilization of these industrial waste has considerable economic benefits. value. [0003] Copper slag is the slag produced in the copper smelting process, which is a kind of non-ferrous metal slag. The waste slag discharged from reverberatory furnace copper smelting is reverberatory furnace copper slag, and the waste slag discharged from blast furnace copper smelting is blast furnace copper slag. my country's copper production ranks first in the world. In th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B1/244C22B1/248C22B5/10C22B19/30C21B13/14
CPCC21B13/008C21B13/146C22B1/244C22B1/248C22B5/10C22B7/04C22B19/30Y02P10/20
Inventor 徐刚任中山闫方兴曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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