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Method for recovering iron from zinc hydrometallurgy rotary kiln slag

A technology of hydrometallurgy and rotary kiln, which is applied in the direction of chemical instruments and methods, improvement of process efficiency, solid separation, etc., can solve the problems of unfavorable enterprise development, low economic value, high grinding cost, etc., and is beneficial to production and energy saving , The process steps are simple, and the effect of reducing the cost of grinding

Inactive Publication Date: 2017-09-12
汉源县伟业环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the recovery rate of iron is high by medium or strong magnetic separation, the grade of iron concentrate is less than 50%, and it contains a large amount of sulfur, generally more than 10%, so for iron and steel enterprises, even a small proportion of added There is no economic value in using it; if the fine grinding particle size is -300 mesh, the grinding cost is too high due to the high hardness of the rotary kiln slag itself. Although the grade of iron concentrate obtained can be above 50%, the enterprise has no profit, which is not conducive business development
The disadvantage of this patent is that: the iron concentrate obtained by medium-intensity magnetic separation is of low iron grade, which is only used as an intermediate product, not for the recovery of iron concentrate
The disadvantage of this patent is that the water-quenched slag is ground to 300-400 mesh, accounting for more than 90%, the cost of grinding is extremely high, the method of segmental grinding is not adopted, and the economic value is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for recovering iron from hydrometallurgy rotary kiln slag, comprising the following steps:

[0036] The first grinding: Firstly, crush the zinc hydro-smelting rotary kiln slag with a crusher, and then use a ball mill to grind the crushed zinc hydro-smelting rotary kiln slag for the first time to obtain pulp I. The mass fraction of zinc smelting rotary kiln slag is 76%, and the particle size of wet zinc smelting rotary kiln slag in pulp I is -35 mesh, accounting for 85%. The pulp I is then classified by a spiral classifier to obtain pulp II;

[0037] Weak magnetic roughing: Add water to the pulp II until the mass fraction of the rotary kiln slag in the pulp is 23%, and then send it into the weak magnetic separator for weak magnetic roughing to obtain iron coarse concentrate and weak magnetic roughing tailings. The magnetic field strength of weak magnetic rough separation is 1600 Oersted;

[0038] Weak magnetic scavenging: Send the weak magnetic roughing tailing...

Embodiment 2

[0044] A method for recovering iron from hydrometallurgy rotary kiln slag, comprising the following steps:

[0045] The first grinding: Firstly, crush the zinc hydro-smelting rotary kiln slag with a crusher, and then use a ball mill to grind the crushed zinc hydro-smelting rotary kiln slag for the first time to obtain pulp I. The mass fraction of zinc smelting rotary kiln slag is 80%, and the particle size of wet zinc smelting rotary kiln slag in pulp I is -35 mesh, accounting for 90%. The pulp I is then classified by a spiral classifier to obtain pulp II;

[0046] Weak magnetic roughing: add water to the pulp II until the mass fraction of the rotary kiln slag in the pulp is 25%, and then send it into the weak magnetic separator for weak magnetic roughing to obtain iron coarse concentrate and weak magnetic roughing tailings. The magnetic field strength of weak magnetic rough separation is 1700 Oersted;

[0047] Weak magnetic scavenging: Send the weak magnetic roughing tailing...

Embodiment 3

[0053] A method for recovering iron from hydrometallurgy rotary kiln slag, comprising the following steps:

[0054] The first grinding: Firstly, crush the zinc hydro-smelting rotary kiln slag with a crusher, and then use a ball mill to grind the crushed zinc hydro-smelting rotary kiln slag for the first time to obtain pulp I. The mass fraction of the zinc smelting rotary kiln slag is 81%, and the particle size of the wet zinc smelting rotary kiln slag in the slurry I is -35 mesh, accounting for 93%. The slurry I is then classified by a spiral classifier to obtain the slurry II;

[0055] Weak magnetic roughing: add water to the pulp II until the mass fraction of the rotary kiln slag in the pulp is 24%, and then send it into the weak magnetic separator for weak magnetic roughing to obtain iron coarse concentrate and weak magnetic roughing tailings. The magnetic field strength of weak magnetic rough separation is 1600 Oersted;

[0056] Weak magnetic scavenging: Send the weak mag...

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PUM

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Abstract

The invention relates to a method for recovering iron from zinc hydrometallurgy rotary kiln slag. The method comprises the steps of: primary ore grinding, weak magnetic rough separation, weak magnetic scavenging, secondary ore grinding and weak magnetic selection. The method is simple in process steps, can extract iron concentrates with the grade of higher than 58% from the rotary kiln slag, changes wastes into valuable materials, and realizes the resource regeneration.

Description

technical field [0001] The invention relates to a method for recovering iron from zinc hydrometallurgy, more specifically, the invention relates to a method for recovering iron from zinc hydrometallurgy rotary kiln slag, which belongs to the technical field of metallurgical slag recovery and utilization. Background technique [0002] In the process of zinc hydrometallurgy, a large amount of leaching slag will be produced, and most of the valuable metals except zinc are concentrated in the leaching slag. After the residual zinc is recovered in the way of rotary kiln calcination, the remaining rotary kiln slag is still Contains valuable components such as iron, carbon, copper, silver, germanium, etc. Due to the lack of economically viable recycling technologies, most enterprises can only build dedicated solid waste storage yards to accumulate these rotary kiln slags, which not only increases the operating costs of the enterprises, but also occupies a large amount of land, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C1/00C22B1/00C21B15/00C22B7/04
CPCB03C1/00B03C1/005C21B15/00C22B1/005C22B7/04Y02P10/20
Inventor 蒋朋钢于恒
Owner 汉源县伟业环保科技有限公司
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