Method of using low-grade zinc oxide ore to produce high-purity nano zinc oxide by means of ammonia process

A technology of nano-zinc oxide and zinc oxide ore, applied in the direction of zinc oxide/zinc hydroxide, nanotechnology, etc., can solve problems affecting the application field, affecting the specific surface area, dispersion, and fluidity 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, disp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] Raw material: a zinc 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%.

[0094] The method for preparing high-purity nano zinc oxide:

[0095] (1) Activation: take 500g zinc 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;

[0096] (2) Leaching: the mixed and activated low-grade zinc oxide ore 1 ＃ Leach with 1500ml ammonia water-ammonium bicarbonate liquid as leaching agent; 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 sodium fluorosilicate to the leaching agent according to the amount of 0.3kg sodium fluorosilicate per cubic meter of leaching agent; the total leach...

Embodiment 2

[0103] 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-zinc spinel 3.20%.

[0104] The method for preparing high-purity zinc oxide:

[0105] (1) Activation: take 500g zinc 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;

[0106] (2) Leaching: the mixed and activated zinc oxide ore 2 ＃ Leach with 1500ml ammonia water-ammonium bicarbonate liquid as leaching agent; 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 sodium fluorosilicate, 0.05kg surfactant SDS, and 0.5kg dicyandiamide to each cubic meter of leaching agent; when leaching, use ball milling and ensure that the ball...

Embodiment 3

[0114] 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%.

[0115] The method for preparing high-purity zinc oxide:

[0116] (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;

[0117] (2) Leaching: mix and activate zinc oxide ore 3 ＃ Use 3000L ammonia water-ammonium bicarbonate solution as leaching agent to carry out leaching; Wherein, in the leaching agent, NH 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 to each cubic meter of leaching agent respectively; The leaching time is 80 minute...

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Abstract

The invention discloses a method of using low-grade zinc oxide ore to produce high-purity nano zinc oxide by means of the ammonia process. The method includes: using slaked lime of 3-5% mass of the low-grade zinc oxide ore for activating before leaching, using ammonia water-ammonium bicarbonate solution as leaching agent, adding 0.3-0.5kg of sodium fluorosilicate into per stere of the leaching agent for leaching, purifying for impurity removal, and refining. On one hand, efficient leaching of the low-grade zinc oxide ore is realized, high-purity zinc oxide with large specific surface area can be obtained at low calcinations temperature, and extremely high practical value and economic value are obtained; and on the other hand, the treatment method is low in energy consumption and high in efficiency. Valuable and poisonous heavy metal in the low-grade zinc oxide ore can be leached out for use and cleaned by means of water washing, and accordingly economy, environment friendliness and reasonable utilization of renewable resources are realized.

Description

technical field [0001] The invention relates to a production method of zinc oxide, in particular to a production method of high-purity nanometer 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%). ...

Claims

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Application Information

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IPC IPC(8): C01G9/02B82Y40/00
Inventor 陈尚全李时春李晓红
Owner SICHUAN JUHONG TECH
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