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Method of using low-grade zinc oxide ore to produce high-purity zinc oxide

A zinc oxide ore, low-grade technology, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problems of poor economic benefit, large consumption of leaching agent and high mud content

Active Publication Date: 2013-01-09
SICHUAN JUHONG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. Due to the low zinc content of minerals, high mud content, low zinc concentration in the leach solution, large consumption of leaching agents and high cost, enterprises cannot afford it
[0009] 2. Due to the complex composition of impurities, the qualified rate of the produced products is low, and the product price is low and the economic benefits are poor
[0010] 3. When leaching by conventional means, the leaching rate of zinc ore is low, the waste is large, and the value of zinc ore cannot be utilized and reflected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Raw material: a zinc oxide mine in Yunnan 1 # , Its composition is: Zn15.48%. Fe18. 20%. Si027. 94%, and its zinc phase composition is zinc carbonate 9.49%, zinc silicate 2. 12%, zinc sulfide 0.73%, iron zinc tip Spar 3.14%.

[0066] Method for preparing high-purity zinc oxide:

[0067] (1) Leaching: 500g low-grade zinc oxide ore 1 # Use 1500ml ammonia water-ammonium bicarbonate solution as the leaching agent for leaching; wherein, NH in the leaching agent 3 The molar concentration of c(NH 3 )=5.5mol / L, CO 3 2- The molar concentration of c(CO 3 2- )=1.2 mol / L, add 0.3kg sodium fluorosilicate per cubic meter of leaching agent, add sodium fluorosilicate to the leaching agent; the total leaching time is 3 hours, the temperature is 25-40℃; solid-liquid After separation, the obtained zinc-ammonia complex solution contains 68.5 grams of zinc; the leaching rate of zinc from zinc oxide ore is 88.5%;

[0068] (2) Pre-distilled ammonia: heat the leaching solution to 90℃ to evaporate ...

Embodiment 2

[0074] Raw material: zinc oxide ore 2 # , Its composition is: Zn9.67%. Fe19.33%. Si026. 63%, CaO28.34%. Its zinc phase composition is zinc carbonate 12.28%, zinc silicate 2.37%. Zinc sulfide 0.8 2% , Fe-Zn spinel 3. 20%.

[0075] Method for preparing high-purity zinc oxide:

[0076] (1) Leaching: 500g zinc oxide ore 2 # Use 1500ml ammonia water-ammonium bicarbonate solution as the leaching agent for leaching; wherein, NH in the leaching agent 3 The molar concentration of c(NH 3 )=7mol / L, CO 3 2- The molar concentration of c(CO 3 2- )=1.2 mol / L, add 0.5kg of sodium fluorosilicate, 0.05kg of surfactant SDS, and 0.5kg of dicyandiamide per cubic meter of leaching agent. Cyanodiamine; when leaching, use a ball mill, and ensure that the leaching time in the ball mill is 60 minutes, and all the materials at the outlet of the ball mill pass through a 140-mesh sieve. The total leaching time is 3 hours and the temperature is 25-40°C; the obtained zinc ammonia complex 42.7 grams of zinc in...

Embodiment 3

[0083] Raw material: zinc oxide ore 3 # Its composition is: Zn13.6%. Fe18.67%. Si027.83%, CaO29.92%. Its zinc phase composition is zinc carbonate 7.96%, zinc silicate 2.21%, zinc sulfide 0.76%, iron zinc Spinel 2.67%.

[0084] Method for preparing high-purity zinc oxide:

[0085] (1) Leaching: 1t zinc oxide ore 3 # Use 3000L ammonia water-ammonium bicarbonate solution as the leaching agent for leaching; wherein, NH in the leaching agent 3 The molar concentration of c(NH 3 )=5.6mol / L, CO 3 2- The molar concentration of c(CO 3 2- )=1.05 mol / L, add 0.4kg sodium fluorosilicate, 0.1kg surfactant SDS, and 1kg dicyandiamide per cubic meter of leaching agent, add sodium fluorosilicate, SDS and dicyandiamide respectively Diamine; when leaching, use a ball mill, and ensure that the leaching time in the ball mill is 80 minutes, and all the materials at the outlet of the ball mill pass through a 140 mesh sieve. The total leaching time is 3.5 hours and the temperature is 25-40°C; after solid-...

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Abstract

The invention discloses a method of using low-grade zinc oxide ore to produce high-purity zinc oxide. The method includes: using ammonia water-ammonium bicarbonate solution for leaching, adding 0.3-0.5kg of sodium fluorosilicate into per stere of ammonia water-ammonium bicarbonate solution, and pre-stilling ammonia before the step of purification for impurity removal. The ammonia process is applied to treatment of low-grade zinc oxide ore, and the existing ammonia process is modified in terms of adaptability, so that speed and rate in leaching zinc from the low-grade zinc oxide ore are increased. The purity of zinc oxide can be higher than 99.7% by adopting the calcination temperature ranging from 350DEG C to 450 DEG C, and high economic value is obtained; in addition, the treatment method is low in energy consumption and high in efficiency, and leaching agent can be recycled; and final leaching residues obtained from leaching treatment are undamaged in original ore composition structure and can be used for brick making and the like, so that dual purposes of economy and environment friendliness are achieved.

Description

Technical field [0001] The invention relates to a method for producing high-purity zinc oxide by using low-grade zinc oxide ore. Background technique [0002] At present, the production of zinc oxide products generally uses ore with high zinc content for roasting into zinc calcine as raw material, because of its high zinc content and relatively easy extraction. With years of mining, the source of high-grade minerals has become less and less, and the grade has gradually decreased. People are now paying attention to the utilization of zinc oxide ore. However, zinc oxide ore usually has a low zinc content (the content of valuable elements is less than 30% Zn; Pb 0.15%; Cu 0.008%; Mn 0.06%), and the composition is complex. Most of them are zincite, zinc iron spinel and heteropolar The ore exists, and the gangue components in the ore contain high content of iron oxide, silicon oxide, calcium oxide, and magnesium oxide (respectively about Fe 2 O 3 4-7%; SiO 2 3-5%; CaO30-32%; MgO 7-8%...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02
Inventor 陈尚全李时春李晓红
Owner SICHUAN JUHONG TECH
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