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Method for producing high-purity zinc oxide by ammonia method using low-grade zinc oxide ores

A zinc oxide ore, low-grade technology, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problems affecting the specific surface area, dispersibility, fluidity, and application fields of zinc oxide.

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

High-temperature calcination seriously affects the specific surface area, dispersion and fluidity of zinc oxide, which in turn affects its application fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Raw material: an oxide mine in Yunnan 1 ＃ , its composition is: Zn15.48%. Fe18. 20%. Si027. 94%, its zinc phase composition is zinc carbonate 9.49%, zinc silicate 2. 12%, zinc sulfide 0. 7 3%, iron zinc tip Spar 3.14%.

[0070] The method for preparing high-purity zinc oxide:

[0071] (1) Activation: take 500g oxide ore 1 ＃ , add 15g slaked lime to obtain mixture, and carry out mixing activation, the mass percent composition of water in the mixture is controlled at 8%, and mixing activation time is 36 hours;

[0072] (2) Leaching: The mixed and activated low-grade zinc oxide ore is leached with 1500ml ammonia water-ammonium bicarbonate solution as a leaching agent; wherein, the 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 sodium fluorosilicate to the leaching agent according to the amount of 0.3kg sodium fluorosilicate per cubic meter of leaching agent; the total leaching ti...

Embodiment 2

[0078] Raw material: 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-zinc spinel 3.20%.

[0079] The method for preparing high-purity zinc oxide:

[0080] (1) Activation: take 500g oxide ore 2 ＃ , add 25g slaked lime to obtain mixture, and carry out mixing activation, the mass percent composition of water is controlled at 9% in the mixture, and the mixing activation time is 36 hours;

[0081] (2) Leaching: The mixed and activated low-grade zinc oxide ore is leached with 1500ml ammonia water-ammonium bicarbonate solution as a leaching agent; wherein, the 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 sodium fluorosilicate, SDS and Dicyandiamide; when leaching, ball milling is used, and the leaching time in the ball mill is guaranteed to be 60 minutes. All the ...

Embodiment 3

[0088] 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%.

[0089] The method for preparing high-purity zinc oxide:

[0090] (1) Activation: take 1t of zinc oxide ore 3 ＃ , add 40kg slaked lime to obtain mixture, and carry out mixing activation, the mass percent composition of water is controlled at 10% in the mixture, and the mixing activation time is 42 hours;

[0091] (2) Leaching: The mixed and activated low-grade zinc oxide ore is leached with 3000L ammonia water-ammonium bicarbonate solution as the leaching agent; wherein, the 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, adding 0.4kg sodium fluorosilicate, 0.1kg surfactant SDS, and 1kg dicyandiamine to each cubic meter of leaching agent, respectively adding sodium fluor...

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Abstract

The invention discloses a method for producing high-purity zinc oxide by an ammonia method using low-grade zinc oxide ores. The method comprises the following steps of: adding 3-5% of slaked lime to low-grade zinc oxide ores to be treated for performing mixing and activation before leaching, controlling water in the mixture at 8-10% by mass percentage, adding 0.3-0.5kg of sodium fluorosilicate to per cubic meter of leaching agent, and preferably adding surfactant and dicyandiamide, wherein an ammonia pre-distillation step can be further added simultaneously, therefore, on the one hand, the leaching speed and the leaching rate of zinc in the low-grade zinc oxide ores are increased, and on the other hand, a lower calcination temperature is preferred, zinc oxide with a greater specific surface area and with the purity up to 99.7% and more can be obtained, and the obtained zinc oxide has high economic value; in addition, the treatment method is low in energy consumption and high in efficiency, and the leaching agent can be recycled. The final leaching residues after performing leaching treatment do not damage the original composition and structure of minerals and can still be used to brick-making, thereby achieving economical and environmental-friendly dual purposes.

Description

technical field [0001] The invention relates to a production method of zinc oxide, in particular to a production method of high-purity zinc oxide. Background technique [0002] At present, the production of zinc oxide products generally uses ore with high zinc content to be roasted into zinc calcine as raw material, because its zinc content is relatively high, and leaching is relatively easy. With years of mining, high-grade ore sources have become less and less, and the grade has gradually decreased. People have begun to pay attention to the utilization of zinc oxide ore. However, zinc oxide ore usually has a low zinc content (valuable element content Zn below 30%; Pb 0.15%; Cu 0.008%; Mn 0.06%), and the composition is complex, mostly smithsonite, zinc iron spinel and heteropolar The ore exists, and the gangue components in the ore are high in iron oxide, silicon oxide, calcium oxide, and magnesium oxide (about Fe 2 o 3 4-7%; SiO 2 3-5%; CaO30-32%; MgO 7-8%). The value...

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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