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.
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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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