Method for alkaline leaching of waste residue containing zinc ferrite or lean zinc ore

A zinc ferrite leaching technology, which is applied in the field of alkaline leaching zinc ferrite waste residue or poor zinc ore, can solve the problems of limited applicability, difficulty in leaching by acid-base leaching, high cost, etc., and achieve good social and economic benefits. Benefit, no environmental pollution, low cost effect

Inactive Publication Date: 2012-07-04
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, if the zinc in the zinc-containing waste slag or raw materials is mainly composed of zinc ferrite (ZnFe 2 o 4 ) forms (such as electric arc furnace dust in steelworks, acid leaching slag, impurity-poor zinc oxide ore, etc.), because zinc ferrite belongs to spinel (AB 2 o 4 ) type, the crystal lattice has considerable stability, and it is difficult to dissolve in general acid-base leaching. The traditional concentrated acid and high-temperature process has limitations in its applicability due to the shortcomings of high material requirements, high cost, and dangerous operation.

Method used

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  • Method for alkaline leaching of waste residue containing zinc ferrite or lean zinc ore
  • Method for alkaline leaching of waste residue containing zinc ferrite or lean zinc ore
  • Method for alkaline leaching of waste residue containing zinc ferrite or lean zinc ore

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The dust from Changzhou Iron and Steel Plant in Jiangsu Province was used as the raw material, and its chemical composition is shown in Table 1. According to phase analysis, ZnFe 2 o 4 It accounts for 81% of the zinc content, and ZnO accounts for 19%.

[0023] Table 1 Chemical composition of soot from Changzhou Iron and Steel Plant in Jiangsu

[0024]

[0025] Add 100 g of the above-mentioned zinc ferrite-containing soot raw material into the stirred mill reactor, and simultaneously add 12-50 g of conversion agent (a mixture of commercially available industrial-grade sulfur and sodium sulfide mixed in any proportion), and the mass ratio of raw material: ball milling medium 1:25, the ball milling medium is corundum balls or stainless steel balls, under the stirring condition of 400-800 rpm, the mechanical activation conversion reaction is carried out for 2 hours, after the reaction is completed, the zinc ferrite in the raw material is converted into zinc sulfide; th...

Embodiment 2

[0027] The zinc ferrite waste residue in Gejiu, Yunnan was used as the raw material, and its chemical composition is shown in Table 2. According to phase analysis, ZnFe 2 o 4 It accounts for 73% of the zinc content, ZnS accounts for 2.5%, ZnSO 4 Accounted for 24.5%.

[0028] Table 2 Chemical composition of Yunnan Mengzi zinc concentrate

[0029]

[0030] 100g of the above-mentioned zinc ferrite-containing waste slag is added to the stirred mill reactor, and 5-25g of conversion agent (the mixture of commercially available industrial grade sulfur and barium sulfide mixed in any proportion) is added at the same time, and the raw material: ball milling medium mass ratio is 1:20, the ball milling medium is corundum balls or stainless steel balls, under the stirring condition of 400-800 rpm, carry out the mechanical activation conversion reaction for 2 hours, after the reaction is completed, the zinc ferrite in the raw material is converted into zinc sulfide; then add alkali ...

Embodiment 3

[0032] The raw material is Hezhang impurity zinc ore in Guizhou, and its chemical composition is shown in Table 3. According to phase analysis, ZnFe 2 o 4 Accounting for 47% of its zinc content, ZnO and Zn 2 SiO 4 53%.

[0033] Table 3 Chemical composition of Hezhang poor zinc ore (%)

[0034]

[0035] Add 100g of the above-mentioned zinc ferrite-containing poor zinc ore into the stirred mill reactor, and at the same time add 2-10g of conversion agent (a mixture of commercially available industrial grade sulfur and calcium sulfide mixed in any proportion), and raw materials: ball milling medium The mass ratio is 1:15, and the ball milling medium is corundum balls or stainless steel balls. Under the stirring condition of 400-800 rpm, the mechanical activation conversion reaction is carried out for 2 hours. After the reaction is completed, the zinc ferrite in the raw material is converted into zinc sulfide; Then add 500ml of alkaline solution with an alkali concentration...

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Abstract

The invention relates to a method for alkaline leaching of waste residue containing zinc ferrite or lean zinc ore. A conversion agent and a raw material are added into a stirred mill reactor simultaneously, the mass ratio of the raw material to a ball milling medium is 1:10-30, and the mass ratio of the conversion agent to the zinc ferrite contained in the raw material is 0.2-1:1; stirring speed is 400-800 r / min, activation conversion reaction time is 1-3h, and the zinc ferrite in the raw material is converted into zinc sulfide; aqueous alkali with alkali concentration of 2-8 mol / L and lead carbonate are added into the stirred mill reactor to be subjected to mechanical agitation leaching for 1-2 h, and solid and liquid are separated through filtering; metal zinc is extracted from a leaching agent through a traditional electrolysis method, and the leaching agent is circulated in next leaching process; leaching residue obtained through filter is converted through sodium carbonate solution to recycle lead in the leaching residue, lead carbonate is produced, and then the lead carbonate is returned to a leaching process to be used repeatedly. The leaching residue after lead conversion can be used as a blast-furnace iron-making raw material, and resource recycling is achieved. The method solves the problem that the zinc ferrite cannot dissolve in the aqueous alkali at the low temperature basically and is low in cost, easy to control and free of environment pollution.

Description

technical field [0001] The invention relates to a method for alkaline leaching waste residue containing zinc ferrite or poor zinc ore, and belongs to the technical field of nonferrous metal recovery and solid waste recycling. Background technique [0002] Metal zinc is widely used in alloy, casting, electroplating, printing and dyeing, pharmaceutical, rubber and battery industries. Metal zinc has become an important metal material essential to the national economy and the people's livelihood. Due to its wide range of uses and economical properties, the production and consumption of metal zinc continue to increase. According to the statistics of the International Lead and Zinc Study Group (ILZSG), the world's zinc The average annual growth rate of consumption is 2.7%. In 2010, the annual consumption of zinc was 12.541 million tons. The increasing demand for metal zinc materials has brought unprecedented resource and environmental problems. On the one hand, the sharp increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/12C22B19/00
CPCY02P10/20
Inventor 张承龙王景伟白建峰周媛吴雯杰
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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