Production method of high-purity nanometer zinc oxide from low-grade zinc oxide ore by ammonia decarbonization

A nano-zinc oxide, zinc oxide ore technology, applied in zinc oxide/zinc hydroxide, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problem of high mud content, low zinc concentration in leachate, zinc Mineral value cannot be utilized and reflected, etc.

Active Publication Date: 2013-01-02
SICHUAN JUHONG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 1. Due to the low zinc content of minerals, high mud content, low zinc concentration in the leaching solution, large consumption of leaching agents and high cost, enterprises cannot afford it
[0010] 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 po

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0087] 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%.

[0088] The method for preparing high-purity zinc oxide:

[0089] (1) Leaching: take 500g oxide ore 1 ＃ , use 1500ml 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 )=7mol / L,CO 3 2- The molar concentration of c(CO 3 2- )=0.95 mol / L, add sodium fluorosilicate to the leaching agent according to the amount of 0.5kg sodium fluorosilicate per cubic meter; add 0.4kg fluorosilicate to the leaching agent respectively Add sodium fluorosilicate, SDS and dicyandiamide to the amount of sodium, 0.03kg of surfactant SDS, and 1kg of dicyandiamide; when leaching, use ball milling, and ensure that the leaching time in the ball mill is 60 minutes. All materials at th...

Embodiment 3

[0098] 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%.

[0099] The method for preparing high-purity zinc oxide:

[0100] (1) Leaching: Take 1t of zinc oxide ore 3 ＃ , use 3000L ammonia water-ammonium bicarbonate solution as the leaching agent for leaching; 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, add sodium fluorosilicate, SDS and dicyandiamide according to the amount of 0.4kg, 0.05kg of surfactant SDS, and 0.5kg of dicyandiamide added to the leaching agent per cubic meter; When leaching, use ball milling, and ensure that the leaching time in the ball mill is 50 minutes. 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...

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PUM

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Abstract

The invention discloses a production method of high-purity nanometer zinc oxide from low-grade zinc oxide ore by ammonia decarbonization. The method comprises the steps of taking ammonia water-ammonium carbonate solution as a leaching agent; adding 0.3-0.5 kg sodium fluorosilicate into per cubic meter leaching agent; leaching low-grade zinc oxide ore with the leaching agent; and adding 50-60 kg slaked lime into per cubic meter leachate to perform decarbonization treatment. The obtained zinc oxide nanopowder has purity not less than 99.7%, uniform particle size distribution (average particle size of 10-28 nm), specific surface area of not less than 107 m<2>/g, good fluidity and dispersibility. The inventive treatment method is low in energy consumption and high in efficiency, and the leaching agent can be recycled. The leaching residue, without destruction of original mineral component phase composition, can still be used for brick making, so as to realize dual purposes of economy and environment protection, and achieve high economic and social benefits.

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): C01G9/02B82Y30/00
Inventor 陈尚全李时春李晓红
Owner SICHUAN JUHONG TECH
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