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Method for comprehensively recycling chlorine containing materials by means of water vapor activation and microwave roasting

A microwave roasting and steam technology is applied in the direction of improving process efficiency, which can solve the problems of difficult exhaust gas treatment, long dechlorination time, low dechlorination rate, etc., and achieves convenient exhaust gas treatment, lower reaction temperature, and improved removal rate. Effect

Inactive Publication Date: 2013-01-16
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the current research is only the introduction of air during the microwave roasting process, the temperature of copper slag oxidative dechlorination is high, the dechlorination rate is low, and the dechlorination time is long. The gas generated by the reaction contains chlorine, and the tail gas treatment is difficult. severely limit the industrial application of the process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Dry the copper slag filter cake produced by chlorine removal in the zinc smelting process to a water content of 2%, then crush it to a particle size of -100 mesh, and then place 108Kg of material with an initial chlorine content of 14.7% in a microwave with an output power of 60KW Roasting is carried out in the heater, and at the same time, 0.5m 3 Air is passed in at an amount of / h. When the material is heated to 350°C, water vapor is introduced at a rate of 1% / h of the mass of the chlorine-containing material, and flue gas is discharged at the same time. This keeps the temperature for 4 hours, and the dechlorination is completed. At this time, the main phase of the chlorine-containing material is converted into CuO after roasting, which is convenient for recycling. The content of chlorine in the obtained product is 2.51%, and the chlorine content of the product that only feeds air under the same conditions is 3.12%, indicating that feeding water vapor can improve the ...

Embodiment 2

[0029] Dry the zinc scum produced during the zinc smelting process to a water content of 0%, then crush it to a particle size of -100 mesh, and then place 120Kg of material with an initial chlorine content of 1.1% in a microwave oven with an output power of 80KW for roasting. At the same time, according to each Kg of chlorine-containing material, 1m 3 Air is passed in at a rate of / h, and when the material is heated to 500°C, water vapor is introduced at 2% / h of the mass of the chlorine-containing material, and flue gas is discharged at the same time, and the dechlorination is completed by keeping the temperature for 2 hours. At this time, the main phase of the chlorine-containing material is converted into CuO after roasting, which is convenient for recycling. The content of chlorine in the obtained product is 0.15%, and the chlorine content of the product that only feeds air under the same conditions is 0.21%, indicating that feeding water vapor can improve the oxidative dec...

Embodiment 3

[0032] Dry the zinc fumes produced during the zinc smelting process to a water content of 0%, then crush them to a particle size of -200 mesh, and then place 100g of materials with an initial chlorine content of 0.45% in a microwave with an output power of 1KW for roasting. At the same time, according to each Kg of chlorine-containing material, 2m 3 Air is introduced at a rate of 1 / h, and when the material is heated to 700°C, water vapor is introduced at a rate of 1.5% / h of the mass of the chlorine-containing material, and flue gas is discharged at the same time, and the dechlorination is completed by keeping the temperature for 2 hours. At this time, the main phase of the chlorine-containing material is converted into CuO after roasting, which is convenient for recycling. The content of chlorine in the obtained product is 0.02%, and the chlorine content of the product that only feeds air under the same conditions is 0.05%, indicating that feeding water vapor can improve the o...

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Abstract

The invention provides a method for comprehensively recycling chlorine containing materials by means of water vapor activation and microwave roasting. The chlorine containing materials generated in the zinc smelting process are dried, crushed and then placed in microwaves for roasting, air is led in, water vapor is led in when the materials are heated to reach the temperature of 350-700 DEG C, flue gas is exhausted, and the temperature is kept for 2-4h, so that dechlorination is completed. Loss of microwave energy is avoided in the heating process as the water vapor is led in after the materials are heated, the chlorine containing materials, the water vapor and ozone are oxidized to generate HCl gas, the gas is easily washed and absorbed to prepare hydrochloric acid to be recycled, chlorine gas is generated when only the air is led in, the chlorine gas is difficultly absorbed, and consequently, tail gas is difficultly exhausted in the dechlorination process and is not easily comprehensively recycled. Moreover, by the method, the dechlorination speed of the materials is greatly increased, the removal rate of chlorine in the materials is also increased, and reaction temperature is reduced.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of zinc hydrometallurgy waste slag, in particular to a method for comprehensively recovering chlorine-containing materials through steam-activated microwave roasting. Background technique [0002] Zinc is widely used in industries such as aerospace, automobiles, ships, steel, machinery, construction, electronics and daily industries. At present, about four-fifths of the world's total zinc production is produced by wet methods, so hydrometallurgy occupies a very important position in zinc smelting. [0003] With the continuous improvement of zinc smelting capacity, the demand for raw materials has also increased rapidly, but the shortage of mineral resources has caused the impurity content of zinc concentrate processed by domestic zinc smelters to become higher and higher. Among them, the increase of chlorine content has caused serious impact on the zinc hydrometallurgy system. C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B3/00C22B19/00
CPCY02P10/20
Inventor 巨少华卢帅丹张利波彭金辉王亚健郑勤
Owner KUNMING UNIV OF SCI & TECH