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Method for producing high-purity zinc oxide through decarbonization on low-grade zinc oxide ore by adopting ammonia process

A zinc oxide ore, low-grade technology, applied in the direction of improving process efficiency, etc., can solve the problems that affect the specific surface area of ​​zinc oxide, dispersion, fluidity, and affect the application field

Active Publication Date: 2012-12-19
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

[0068] 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%.

[0069] The method for preparing high-purity zinc oxide:

[0070] (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 )=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 time is 3 hours, and the temperature is 25-40°C; After solid-liquid separation, 69.3 grams of zinc in the obtained zinc-ammonia complex solution; the leaching rate of zinc oxide ore zinc is 89.5%;

[0071] (2) Decarburization: After leaching, control t...

Embodiment 2

[0077] 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%.

[0078] The method for preparing high-purity zinc oxide:

[0079] (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- )=0.85 mol / L, adding 0.5kg sodium fluorosilicate to the leaching agent per cubic meter; adding 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 the outlet of the ball mill pass through a 14...

Embodiment 3

[0086] 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%.

[0087] The method for preparing high-purity zinc oxide:

[0088] (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 temperatur...

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Abstract

The invention discloses a method for producing high-purity zinc oxide through decarbonization on low-grade zinc oxide ore by adopting an ammonia process. Ammonia-ammonium bicarbonate is taken as a leaching agent, 0.3-0.5kg of sodium fluosilicate is added into per cubic meter of the leaching agent, and 30-60kg of slaked lime is added into per cubic meter of leaching liquid for heating up and decarbonising; the ammonia process is applied to treatment on the low-grade zinc oxide ore, and adaptability improvement is carried out on the existing ammonia process, thus zinc in the low-grade zinc oxide ore is fully recycled; meanwhile, lower calcination temperature is adopted preferably in the method disclosed by the invention, thus zinc oxide with large specific surface area can be obtained, purity can reach up to more than 99.7%, and higher economic value is realized; and besides, the method disclosed by the invention has low energy consumption and high efficiency, the leaching agent is recycled, final leaching slag subjected to leaching does not destroy the original mineral composition structure and still can be used for making bricks, and dual purposes of being economic and being environment-friendly can be achieved.

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%), and the mu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/14C22B19/00
CPCY02P10/20
Inventor 陈尚全李时春李晓红
Owner SICHUAN JUHONG TECH
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