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

A zinc ferrite and leaching technology, which is applied in the field of alkaline leaching of zinc ferrite-containing waste residues or impurity zinc ore, can solve the problems of limited applicability, difficult 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: 2013-07-03
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, if the zinc in zinc-containing waste slag or raw materials is mainly zinc ferrite (ZnFe 2 o 4 ) form exists (such as electric arc furnace dust in steelmaking plants, 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

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Effect test

Embodiment 1

[0021] 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%.

[0022] Table 1 Chemical composition of soot from Changzhou Iron and Steel Plant in Jiangsu

[0023]

[0024] Add 100g of the above-mentioned zinc ferrite-containing soot raw material into the stirred mill reactor, and at the same time add 12-50g 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

[0026] 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%.

[0027] Table 2 Chemical composition of Yunnan Mengzi zinc concentrate

[0028]

[0029] Add 100g of the above zinc ferrite-containing waste slag into the stirring mill reactor, and at the same time add 5-25g of conversion agent (a mixture of commercially available industrial-grade sulfur and barium sulfide mixed in any proportion), and the mass ratio of raw materials: ball milling medium 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 500ml of alkali...

Embodiment 3

[0031] 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 Accounted for 53%.

[0032] Table 3 Chemical composition of Hezhang impurity zinc ore (%)

[0033]

[0034] 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 alkali solution with an alka...

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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. Zinc metal has become an important metal material essential to the national economy and people's livelihood. Due to its wide range of uses and economical efficiency, 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 increase in...

Claims

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Application Information

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Patent Type & Authority Patents(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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