Method for smelting and extracting zinc tailings by recovery method

A technology for pyrometallurgy and tailings, which is applied in the field of effective utilization of waste resources to achieve the effects of increased added value, stable grade and uniform particle size.

Inactive Publication Date: 2012-06-13
PANZHIHUA GANGCHENG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the process of returning to the furnace, TFe is further reduced to lay the foundation for the next process, but the Fe inside is reduced again, and a large amount of waste will be generated during ironmaking, resulting in new pollution

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0027] A. Removal of impurities, sorting, and crushing of tailings: remove bricks, paper scraps and large pieces of iron (ie, iron nuggets) in the tailings; sort out large pieces of tailings larger than 150mm*150mm for crushing. Crushing large pieces of iron-containing tailings to a particle size below 150mm*150mm is beneficial for later ball milling. Due to the use of rough machining For the overflow ball mill, the requirement for the input particle size is not more than 150mm*150mm.

[0028] B. Ball milling and magnetic separation: The crushed iron-containing tailings are subjected to secondary grinding and secondary separation to obtain enrichment material with an MFe grade of about 40%-50%. Specifically, two rounds of ball milling-magnetic separation are used to enrich the tailings: in the first round of ball milling-magnetic separation, the ball mill adopts Ball mill ball mill, magnetic separation adopts 2000 gauss magnetic field strength ore dressing; the second roun...

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Abstract

The invention belongs to the technical field of effective utilization of a waste resource, more specifically relates to a novel method for smelting and extracting zinc tailings by a recovery method. The novel method of the invention comprises the following steps: pretreating tailings, carrying out ball milling and magnetic separation on the tailings to obtain an enriched material with metallic iron grade of 40-50%, carrying out ball milling and the magnetic separation on the enriched material and reselecting to obtain a material product with the metallic iron grade greater than 80%, wherein, the tailings are subjected to at least two circles of ball milling and magnetic separation processes to obtain the enriched material. The product possesses high iron grade, and can be directly used as a reducing agent for producing titanium dioxide. According to the invention, useful elements in zinc tailings can be utilized in a reasonable mode by the recovery method, so that the added value of zinc tailings can be further enhanced, the value can reach the maximization, and the metallic iron can be effectively utilized; the traditional old technology that the material is returned to a blast furnace for making iron and carrying out multi-time reduction is changed, and the secondary pollution generated by reusing the waste resource can be reduced.

Description

technical field [0001] The invention belongs to the technical field of effective utilization of waste resources, and in particular relates to a new method for recovering zinc extraction tailings from pyrometallurgy. Background technique [0002] The tailing slag obtained after zinc extraction by pyrolysis has an MFe grade of about 20%-25% and a TFe of about 50%. Usually, the tailings are returned to the ironmaking blast furnace for recycling. In the process of returning to the furnace, TFe is further reduced to lay the foundation for the next process, but the Fe inside is reduced again, and a large amount of waste will be generated during ironmaking, resulting in new pollution. [0003] The inventor of the present invention provides a new method using the tailings obtained after zinc extraction by pyrolysis, finds a new method for reusing waste resources, and reduces secondary pollution caused by reusing waste resources as much as possible. Contents of the invention [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04B03C1/00
CPCY02P10/20
Inventor 鲜中菊刘东务
Owner PANZHIHUA GANGCHENG GROUP
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