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Method for producing zinc-containing complex or zinc oxide using zinc-containing raw ore via intermediate step for synthesis of calcium zincate

A composite, calcium zincate technology, applied in the direction of zinc oxide/zinc hydroxide, calcium/strontium/barium oxide/hydroxide, improvement of process efficiency, etc., can solve the problem that the utilization of low-grade zinc-containing raw ore cannot be unsatisfactory Satisfaction, poor overall production efficiency, difficult to control product purity, etc., to avoid water treatment pressure, realize economical and environmentally friendly utilization, and high selectivity

Active Publication Date: 2020-03-20
CHONGQING DONGQUN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process requires heating to distill ammonia, which consumes a lot of energy and the pollution caused by ammonia volatilization is difficult to control. In addition, a large amount of impurities co-precipitate during the ammonia distilling process, the product purity is difficult to control, and the overall production efficiency is not good.
[0006] 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

[0189] In a zinc mine in Yunnan, the zinc content is 11.67%, and the oxidation rate of the raw ore is 95.2%. The main form of zinc in this mine is zinc carbonate.

[0190] Get 300 grams of zinc oxide raw ore, put into 900 milliliters of ammonia-ammonium bicarbonate mixed solution (10% of total ammonia mass concentration, 5% 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 mass concentration of zinc in the liquid is 3.374% (calculated as zinc oxide, then 4.2%), and the mass concentration of carbonate in the liquid is 6.21%, and the increased part is brought in by 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 91.11%, and the recovery rate of total zinc is 86.74%.

[0191] The zinc-ammonia complex liquid zinc-ammonia complex liquid obtained by filtering i...

Embodiment 2

[0196] In a zinc mine in Chongqing, the zinc content is 12.93%, and the oxidation rate of the raw ore is 94.82%. The main form of zinc in this mine is zinc silicate.

[0197] Get 300 grams of zinc-containing raw ore, put it into 900 milliliters of ammonia-ammonium bicarbonate mixture (10% total ammonia mass concentration, 6% carbonate mass concentration) and carry out heating and stirring extraction, extraction temperature is 50 ° C, and stirring time is 2 hours , and then filtered, after filtering, the mass concentration of zinc in the liquid was 3.681%, and the mass concentration of carbonate in the liquid was 6.34%, and the increased part was brought in by zinc carbonate in the raw ore. According to the test data, the recovery rate of soluble zinc in the raw ore during the extraction process is 90.07%, and the recovery rate of total zinc is 85.41%.

[0198] The zinc-ammonia complex liquid zinc-ammonia complex liquid obtained by filtering is purified.

[0199] Get 600 milli...

Embodiment 3

[0203] 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.

[0204] 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 (calculated in zinc oxide equivalent), the mass concentration of carbonate in the liquid is 4.23%, and the increased part is brought in by 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%.

[0205] Purify the zinc ammonia complex solution obtained by filtering.

[0206] Take 600 ml of zinc-ammonia complex...

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Abstract

Disclosed is a method for producing a zinc-containing complex or zinc oxide using a zinc-containing raw ore via an intermediate step for the synthesis of calcium zincate. The method for producing a zinc-containing complex using a zinc-containing raw ore via an intermediate step for the synthesis of calcium zincate comprises an extraction step, an optional purification step, a decarburization and precipitation step, a calcium zincate synthesis step, an optional rinsing step and a calcination step; and the method for producing zinc oxide using a zinc-containing raw ore via an intermediate step for the synthesis of calcium zincate comprises an extraction step, an optional purification step, a decarburization and precipitation step, a calcium zincate synthesis step, an optional rinsing step, acalcination step and a calcium-zinc separation step.

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-containing compound or zinc oxide by using low-grade zinc oxide raw ore through an intermediate step of calcium zincate synthesis. Background technique [0002] The production and consumption of zinc in China ranks first in the world, and the domestic zinc resources cannot meet the production needs, so a large amount of zinc raw materials need to be imported every year. China is a country rich in zinc oxide resources. The reserves of zinc metal in zinc oxide ore 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 China generally have a low grade of zinc, with an average grade of less than 5%. At present, the stagnant ore and lean ore reserves that cannot be economically utilized accou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/14C22B3/44C22B19/20C22B19/34
CPCC22B3/12C22B3/44C22B19/24C22B19/34C01F11/02C01G9/03C22B3/14C22B19/20Y02P10/20
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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