Method for producing high-purity nano zinc oxide from low-grade zinc oxide ores

A nano-zinc oxide and zinc oxide ore technology, which is applied in the direction of zinc oxide/zinc hydroxide, process efficiency improvement, etc., can solve problems such as high mud content, low zinc concentration in leachate, complex impurity components, etc.

Active Publication Date: 2012-12-26
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 poor
[0011] 3. When leaching by conventional means, the leaching rate of zinc ore is low, the residual zinc in the leaching slag is high and wasteful, and the value of zinc ore cannot be utilized and reflected
In fact, the precipitation of high-concentration zinc-ammonia liquid has high efficiency and low energy consumption, while the precipitation of low-concentration zinc-ammonia liquid has low efficiency and high energy consumption. It is technically feasible to artificially increase the proportion of water to obtain nano-zinc oxide products , but may not be economically feasible

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] 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%.

[0076] The method for preparing high-purity zinc oxide:

[0077] (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, 68.5 grams of zinc in the obtained zinc-ammonia complex solution; the leaching rate of zinc oxide ore zinc is 88.5%;

[0078] (2) Pre-distillation of ammonia: heat the lea...

Embodiment 2

[0085] 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%.

[0086] The method for preparing high-purity zinc oxide:

[0087] (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 the materials a...

Embodiment 3

[0095] 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%.

[0096] The method for preparing high-purity zinc oxide:

[0097] (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 nano zinc oxide from low-grade zinc oxide ores, which comprises the following steps: leaching with an ammonia water-ammonium bicarbonate solution; adding 0.3-0.5kg of sodium fluosilicate into per cubic meter of the ammonia water-ammonium bicarbonate solution; performing ammonia pre-evaporation; then performing purification and impurity removal; and finally refining. According to the invention, the ammonia method is used for the treatment of electrolyzing low-grade zinc oxide ores, and the existing ammonia method is adaptively improved, so that zinc in the low-grade zinc oxide ores can be sufficiently recycled. Through the treatment of the technical means of the invention, the purity of zinc oxide obtained by calcining at 350-450 DEG C can be up to 99.7% or above; the nano zinc oxide product of which the particle size is 10-50nm has a high economic value; the treatment method is low in energy consumption and high in efficiency, and realizes the cyclic utilization of the leaching agent; and the final leaching residue subjected to leaching treatment does not destroy the original mineral composition structure, and can be still used for brick making and other purposes, thereby achieving the dual goals of economy and environment friendliness.

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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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/14C01G9/02C22B19/00
CPCY02P10/20
Inventor 陈尚全李时春李晓红
Owner SICHUAN JUHONG TECH
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