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

A zinc oxide and zinc slag technology, which is 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 realize Effect of fully utilizing, reducing requirements and consumption of coal

Active Publication Date: 2014-04-16
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. The coal is the same. The leaching slag is mixed with the coal at a ratio of 1:45. The kiln head is fed with a mixed gas with an oxygen concentration of 25-45% at 2560 M3 per hour. The final product and comprehensive content of kiln residue are as follows.

[0021] .

[0022] The volatilization rate of Zn in the leaching residue is 93.93%. In this example, the kiln condition is good during the production process, the kiln is not formed, the materials are fully turned, the coal is fully burned, the product quality is high, the Zn volatilization rate is good, and the lead volatilization rate is excellent. However, surplus coal causes fuel waste and high costs.

Embodiment 2

[0023] Example 2: The leaching residue used in this example is the same as the above-mentioned conventional process. Coal with a calorific value of 4500 kcal is used. The leaching residue and coal are mixed at a ratio of 1:40. The kiln head is fed with oxygen at 2800 M3 per hour. A mixed gas with a concentration of 25-45%. The final product and comprehensive content of kiln residue:

[0024] .

[0025] The volatilization rate of Zn in the leaching residue is 94.24%. In this example, the kiln is in good condition during the production process, the kiln is not formed, the materials are 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] Embodiment 3: The leaching slag and coal used in this example are the same as those in the above example, and the lead-containing leaching slag stored in the applicant's three anti-slag dam is mixed with the conventional leaching slag to achieve the purpose of recovering lead metal. The lead-containing leaching residue has a pH value of 4.5-5.2, a moisture content of 18-22%, and the main components are as follows.

[0027] .

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

[0029] .

[0030] The volatilization rate of Zn in the leaching residue is 93.93%, Pb The volatilization rate is 91%. In this example, during the production process, the kiln condition 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 Patents(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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