Method for extracting lead-zinc oxide by utilizing zincilate volatilization kiln

A zinc oxide and zinc slag technology, applied in the direction of improving process efficiency, can solve problems such as unsatisfactory zinc and lead volatilization rates, incomplete combustion of volatilized kiln carbon, and difficulty in reducing fuel costs, so as to shorten the complete combustion time and achieve The effect of making full use of, reducing requirements and coal consumption

Active Publication Date: 2012-04-04
YUNNAN XIANGYUNFEILONG RESOURCES RECYCLING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process has the following problems in the actual production operation: the oxygen concentration in the volatilization kiln is insufficient, resulting in incomplete combustion of the volatilization kiln carbon, and relatively poor volatilization conditions, especially in plateau areas where the air is relatively thin, and this problem is even more prominent ; In the reduction and volatilization process, coke powder or high-quality coal must be used, which makes it difficult to reduce fuel costs, and the volatilization rate of zinc and lead is not ideal enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: The leaching slag used in this example is the same as the above-mentioned conventional process, and the coal is the same. The leaching slag and coal are mixed in a ratio of 1:45, and the kiln head is fed with a mixed gas with an oxygen concentration of 25-45% at 2560 M3 per hour. , the comprehensive content of the finally obtained product and kiln slag is as follows.

[0021] .

[0022] The Zn volatilization rate in the leaching residue was 93.93%. In this example, the kiln condition is good during the production process, the kiln is not closed, the material is fully turned, the coal is fully burned, the product quality is high, the volatilization rate of Zn is good, and the volatilization rate of lead is excellent. However, the surplus of coal leads to waste of fuel and high cost.

Embodiment 2

[0023] Embodiment 2: the leaching slag adopted in this example is the same as the above-mentioned conventional process, adopting calorific value is the coal of 4500 kilocalories, the leaching slag and coal are mixed in a ratio of 1:40, and the kiln head is passed into oxygen at 2800 M per hour. A mixed gas with a concentration of 25-45%. The comprehensive content of the final product and kiln slag:

[0024] .

[0025] The Zn volatilization rate in the leaching residue was 94.24%. In this example, the kiln condition is good during the production process, the kiln is not closed, the material is fully turned, the coal is basically completely burned, the product quality is high, the volatilization rate of Zn is very good, and the volatilization rate of lead is excellent. The cost is lower.

Embodiment 3

[0026] Example 3: The leaching slag and coal used in this example are the same as the above example, and the lead-containing leaching slag stockpiled in the third anti-slag dam of the applicant company is mixed with conventional leaching slag to achieve the purpose of recovering lead metal. The pH value of lead-containing leaching residue is 4.5-5.2, and the moisture content is 18-22%. The main components are as follows.

[0027] .

[0028] The mixing ratio is 3:1 for conventional leaching slag and lead-containing leaching slag, and 1:45 for mixed leaching slag and coal. The kiln head is fed with a mixed gas with an oxygen concentration of 25-45% at 2560 M3 per hour. , the comprehensive content of the finally obtained product and kiln slag is as follows.

[0029] .

[0030] The volatilization rate of Zn in the leaching residue is 93.93%, and that of Pb is 91%. In this example, the kiln condition is good during the production process, the material is sticky, the kiln is ...

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Abstract

The invention belongs to a method for extracting lead-zinc oxide through oxygen enriched combustion by utilizing zincilate volatilization kiln. The process comprises the steps such as burdening, oxygen preparation, oxygen pressure storage, gas mixing, concentration adjusting, air supply and the like, wherein in the burdening link, the mass ratio of leaching slag to coal is 1:(35-45) and the mixture comprises 12-16wt% of carbon; in the volatilization process, slaked lime accounting for 5-10wt% of the mixture is added; in the gas mixing link, oxygen with the volume concentration of more than 90% and the oxygen supply pressure of 0.4-0.5Mpa is introduced, oxygen is mixed in a gas mixing tank at the head of the kiln, and the volume concentration of the mixed gas is controlled to be 25-45%; and in the volatilization link, lead-zinc oxide smoke is controlled to be volatilized and output at the temperature of 200-1350 DEG C. According to the invention, the carbon combustion condition of the volatilization kiln can be improved, the fuel consumption can be greatly reduced, the concentration of the oxygen in the volatilization kiln can be reasonably promoted, the carbon combustion efficiency can be improved, energy conservation can be achieved, the cost is lowered, and the metal volatilization ratio can be improved.

Description

technical field [0001] The invention belongs to the field of pyroprocessing of zinc leaching slag from hydrometallurgy and pyroprocessing enrichment of low-grade zinc oxides, and in particular relates to a method for extracting zinc and lead oxide through oxygen-enriched combustion in a zinc leaching slag volatilization kiln. Background technique [0002] The wet zinc smelting process of zinc sulfide concentrate undergoes oxidation roasting-leaching to produce iron-containing zinc leaching slag, which is usually treated by volatilization kiln. The treatment method is to mix leaching slag and coke powder or high-quality coal according to slag / coke (coal) ratio of 1:0.5~0.7, and reduce and volatilize zinc at high temperature to produce zinc oxide powder and kiln slag respectively. When the zinc volatilizes, the lead, indium and some silver in the slag also volatilize at the same time. [0003] Another method of dealing with leached slag in zinc hydrometallurgy is the wet proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B19/30C22B19/34C22B13/00
CPCY02P10/20
Inventor 杨龙邹雪松
Owner YUNNAN XIANGYUNFEILONG RESOURCES RECYCLING TECH CO LTD
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