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Method for preparing zinc oxide by using zinc-contained raw ores

A technology of zinc oxide and raw ore, which is applied in the field of producing zinc oxide by using low-grade zinc oxide raw ore, can solve the problems of poor comprehensive economic benefits, inability to handle, and unsuitability for industrial application, and solve the problems of process recovery rate and high-quality goods grade, and avoid Water treatment pressure, the effect of a wide range of applications

Inactive Publication Date: 2018-11-30
CHONGQING DONGQUN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The selectivity of sulfuric acid leaching method is low, and a large amount of soluble silicon in the ore will be leached, and the generated colloidal silicon is difficult to filter, and the acid leaching method generates a large amount of sulfate residue, which causes great environmental protection treatment pressure; sulfuric acid leaching cannot effectively Treat the zinc silicate, zinc ferrite and other components in the ore
The calcium chloride method cannot effectively deal with the leaching of zinc silicate, zinc ferrite and other components in the raw ore, and the leaching rate is not ideal, requiring high temperature leaching, and the comprehensive economic benefits are not good
In the ammonium chloride method, after the raw ore is leached, the process of recovering the zinc component from the leaching solution is very difficult, which is not suitable for industrial application.
[0007] Therefore, the existing technology is not satisfactory for the utilization of low-grade zinc-containing raw ore

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] In a zinc mine in Yunnan, the zinc content is 5.6%, and the oxidation rate of the raw ore is 96.3%. The main form of zinc in this mine is zinc carbonate.

[0124] Get 300 grams of zinc-containing raw ore, put into 900 milliliters of ammonia-ammonium bicarbonate mixed solution (10% of total ammonia mass concentration, 3% of carbonate root mass concentration) and carry out stirring and leaching, the leaching temperature is normal temperature, and the stirring time is 2 hours, Then filter, the filtered liquid contains 1.632% zinc (in zinc oxide equivalent), and the carbonate mass concentration in the liquid is 4.23%, and the increased part is brought in by the zinc carbonate in the raw ore. According to the test data, the recovery rate of soluble zinc in the raw ore during the leaching process is 90.79%, and the recovery rate of total zinc is 87.43%.

[0125] The filtered leachate containing zinc ammonium ions is purified.

[0126] Take 600 ml of purified leaching solutio...

Embodiment 2

[0131] In a zinc mine in Chongqing, the zinc content is 4.7%, and the oxidation rate of the raw ore is 95.52%. The main form of zinc in this mine is zinc silicate.

[0132] Get 300 grams of zinc oxide raw ore, put into 900 milliliters of ammonia-ammonium bicarbonate mixed solution (10% of total ammonia mass concentration, 3% of carbonate root mass concentration) and carry out stirring and leaching, leaching temperature is normal temperature, stirring time is 2 hours, Then filter, after filtering, the zinc oxide in the liquid is 1.367%, the mass concentration of carbonate in the liquid is 3.54%, and the increased part is brought in by the zinc carbonate in the raw ore. According to the inspection data, the recovery rate of soluble zinc in the raw ore during the leaching process is 91.35%, and the recovery rate of total zinc is 87.26%.

[0133] The filtered leachate containing zinc ammonium ions is purified.

[0134] Take 600 ml of purified leaching solution, add 12.18 g of cal...

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Abstract

The invention relates to a method for preparing zinc oxide by using zinc-contained raw ores. The method comprises a leaching step, an optional purifying step, a decarbonization step, a strontium zincate synthesis step, an optional rinsing step, a calcining step, and a strontium-zinc separation step. The method combines wet leaching with the synthesis process, so that the economical and environment-friendly utilization of low-grade zinc ores is realized, the application range is wide, the ammonia evaporation is not needed, both convenience and feasibility are achieved, the energy consumption ofthe process is greatly reduced, the multi-aspect problems of water treatment pressure, the high-temperature and high-pressure potential safety hazards and the equipment corrosion problem caused by the ammonia evaporation are prevented, the environmental protection problem caused by influence on the process water balance due to introduction of excessive water in steam in an ammonia circulating process is solved, the process recovery rate and the finish product grade problem are solved, and the pollution is low; materials can be recycled; the synthesis of strontium zincate under a zinc ammoniaenvironment is realized for the first time; and zinc oxide products are prepared by calcium strontium.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, relates to resource utilization of low-grade zinc-containing raw ore, in particular to a method for producing zinc oxide by using low-grade zinc oxide raw ore. Background technique [0002] The production and consumption of zinc in my country ranks first in the world. Domestic zinc resources cannot meet the production requirements, and a large amount of zinc raw materials need to be imported every year. my country is a country rich in zinc oxide resources. The reserves of zinc metal in zinc oxide ore in my country are about 28 million tons, accounting for about 27.7% of the zinc metal reserves in zinc oxide ore in the world. Zinc oxide mines in my country generally have a low zinc grade, with an average grade of less than 5%. At present, the stagnant ore and lean ore reserves that cannot be economically utilized account for the vast majority, among which the mining tailings co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/14C22B3/44C22B19/20C22B19/34
CPCC22B3/14C22B3/44C22B19/24C22B19/34Y02P10/20
Inventor 岳辉伟李世川龙忠祥蒋涛刘权锋
Owner CHONGQING DONGQUN TECH CO LTD
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