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Comprehensive recovery method of zinc oxide fume dust

A recovery method and zinc oxide technology, applied in the direction of improving process efficiency, can solve the problems of affecting zinc electrolysis, low comprehensive recovery rate and high cost, and achieve the effect of recovery

Active Publication Date: 2011-09-07
ZHUZHOU SMELTER GRP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, since the fluorine and chlorine content in zinc oxide soot is generally above 2% and 3%, the fluorine and chlorine content is relatively high, which seriously affects the electrolysis of zinc and makes the comprehensive recovery of valuable metals more complicated. There are still many technical problems to be solved.
At present, these zinc oxide soots in the prior art only use the method of preparing zinc sulfate series products to recover the zinc, and the recovery rate of zinc is below 86%. The cadmium, lead and high-value metals contained in zinc oxide soot and other soot Indium and thallium are not recovered, resulting in a large loss of valuable metal resources
In the prior art, those skilled in the art have tried various methods to recover valuable metals such as zinc, cadmium, lead, indium, and thallium. In order to eliminate the side effects caused by the high content of fluorine and chlorine, direct alkali elution was used in this field Chlorine method, the fluorine and chlorine removal rate of this method is below 80%, the fluorine and chlorine removal treatment in the follow-up process is still very difficult, and the cost is relatively high, it does not have the economic feasibility of industrial application, zinc, cadmium and The recovery rates of indium are 86%, 80% and 75% respectively, thallium has not been recovered, the comprehensive recovery rate is not high, and the lead content in the slag is about 35%, which is not conducive to further processing and recovery of lead

Method used

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Experimental program
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Effect test

Embodiment 1

[0055] The multi-heart furnace zinc oxide soot is comprehensively recovered by the present invention, and the zinc oxide soot is composed of the following weight percentages: Zn35.87%, F2.65%, Cl5.81%, In0.0468%, Tl0.28%, Cd3. 13%, Cu0.12%, Fe1.47%, Pb15.35%, Co0.005%, Ni0.002%, As0.041%, Sb0.075%, according to the following steps:

[0056] Step 1: Calculate Na 2 CO 3 Add gross weight, calculate by conventional method to make F, Cl and Na contained in the zinc oxide soot to be treated 2 CO 3 Na required for the reaction to generate NaF and NaCl 2 CO 3 Theoretical weight; carry out alkaline washing in two stages, first zinc oxide soot and above-mentioned Na 2 CO 3 55% solid Na by theoretical weight 2 CO 3 After mixing evenly, add water and stir at a high speed, the stirring speed is 600r / min, so that the zinc oxide soot is dissolved and mixed with Na 2 CO 3 Reaction, generate the zinc oxide soot solution containing solid slag, filter to obtain the first section of alk...

Embodiment 2

[0063] The zinc oxide soot is comprehensively recovered by the present invention, and the components of the zinc oxide soot are the following weight percentages: Zn35.87%, F2.65%, Cl5.81%, In0.0468%, Tl0.28%, Cd3.13 %, Cu0.12%, Fe1.47%, Pb15.35%, Co0.005%, Ni0.002%, As0.041%, Sb0.075%.

[0064] Proceed as follows:

[0065] Step 1: Calculate Na 2 CO 3 Add total weight, calculate by conventional method to make F, Cl and Na contained in zinc oxide soot 2 CO 3 Na required for the reaction to generate NaF and NaCl 2 CO 3 Theoretical weight; carry out alkaline washing in two stages, first zinc oxide soot and above-mentioned Na 2 CO 3 65% solid Na by theoretical weight 2 CO 3 After mixing evenly, add water and stir at a high speed, the stirring speed is 700r / min, so that the zinc oxide soot is dissolved and mixed with Na 2 CO 3 Reaction, generate the zinc oxide soot solution containing solid slag, filter to obtain the first section of alkaline washing solution and alkaline...

Embodiment 3

[0073] Adopt the present invention to carry out comprehensive recovery to multi-hearth furnace zinc oxide soot, the component of zinc oxide soot is following percentage by weight Zn35.87%, F2.65%, Cl5.81%, In0.0468%, Tl0.28%, Cd3.13%, Cu0.12%, Fe1.47%, Pb15.35%, Co0.005%, Ni0.002%, As0.041%, Sb0.075%.

[0074] Follow these steps:

[0075] Step 1: Calculate Na 2 CO 3 Add the total weight, and calculate the F, Cl and Na contained in the zinc oxide soot according to the conventional method 2 CO 3 The Na required for the reaction to form NaF and NaCl 2 CO 3 Theoretical weight; Alkali washing is carried out in two stages. In the first section of alkali washing step, the above-mentioned Na 2 CO 3 75% of theoretical weight in solid Na 2 CO 3 After mixing evenly, add water and stir at a high speed, the stirring speed is 750r / min, so that the zinc oxide soot is dissolved and mixed with Na 2 CO 3 reaction to generate a zinc oxide soot solution containing solid slag, and filte...

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Abstract

The invention relates to a comprehensive recovery method of zinc oxide fume dust. The method comprises the following steps: 1. performing alkali-washing on zinc oxide fume dust with Na2CO3 and NaOH in different stages: in the first stage of alkali wash, evenly mixing the zinc oxide fume dust and solid Na2CO3, adding water, stirring at high speed to dissolve the solid into solution with slag, and filtering to obtain first-stage alkali wash liquid and alkali wash slag; in the second stage of alkali wash, adding solid Na2CO3 and NaOH into the first-stage alkali wash slag, adding water, stirring to dissolve the solid, regulating the pH value, and filtering to obtain second-stage alkali wash liquid and alkali wash slag; and carrying out neutral leaching on the second-stage alkali wash slag, purifying and electrodepositing to obtain electric zinc; 2. leaching, displacing and the like to process the low temperature purified slag to obtain sponge cadmium; and 3. processing acid leached slag to obtain coarse indium, using high-temperature high-acidity leached slag as the raw material for recovering lead, and using alkali wash liquid for recovering thallium. In the invention, metals in ZnCl2, ZnF2 and PbCl2 form carbonate solid slag, chlorine and fluorine are dissolved in solution in the form of sodium salts, the slag and the liquids are respectively processed subsequently, and the products in every stage are refined processed to comprehensively recover zinc, cadmium, lead, thallium and indium.

Description

technical field [0001] The invention relates to a method for recycling soot produced in the process of metal zinc smelting, in particular to a method for comprehensively recycling the zinc oxide soot produced in the process of zinc hydrometallurgy. Background technique [0002] Zinc hydrometallurgy is a common process for metal zinc smelting. In the process of hydrometallurgical zinc smelting, zinc oxide soot is a large amount of waste produced. After the removal of F and Cl, a kind of soot, namely zinc oxide soot, is obtained in the process. In general, these soots contain recyclable valuable metals. For example, zinc oxide soot from multi-heart furnaces contains 30-40% zinc, 10-20% lead, 3-8% cadmium, and 0.2-1.2% thallium. %, and each ton of multi-heart furnace zinc oxide soot also contains 400-1500 g of indium, which has high recovery value. However, since the content of fluorine and chlorine in zinc oxide soot is generally above 2% and 3%, the content of fluorine and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02
CPCY02P10/20
Inventor 林文军刘一宁赵为上廖贻鹏
Owner ZHUZHOU SMELTER GRP
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