Resource recovery process of galvanizing sludge

A technology of electroplating sludge and treatment process, applied in the direction of oxidation treatment of sludge, etc., can solve the problems of waste of resources, loss, and inability to run production for a long time.

Inactive Publication Date: 2009-07-01
台州盛世环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many reports on the recycling and harmless treatment of electroplating sludge. Some demonstration projects have been built, but because of the high cost of treatment and serious losses, the production cannot be operated for a long time, production has been stopped or changed, and electroplating sludge is still Stabilized / cured to achieve its harmlessness, causing a great waste of resources

Method used

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  • Resource recovery process of galvanizing sludge
  • Resource recovery process of galvanizing sludge
  • Resource recovery process of galvanizing sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Composition of electroplating sludge: Cr(OH) 3 4.78%, Cu(OH) 2 0.45%, Zn(OH) 2 1.07%, Ni(OH) 2 0.56%, Fe(OH) 2 2.15%, moisture is 87.6%, and other impurities are 3.39%. After the above sludge is dried by a drum dryer, weigh 1 ton, weigh 0.7 tons of coke, 0.24 tons of serpentine, and 0.22 tons of water 0.1 tons of slag and limestone; after being weighed and weighed, it is lifted to the feeding platform by the elevator, and after being stirred evenly, it is evenly fed into the smelting furnace through the feeding door, and the material column height in the furnace is 3 meters. The air enters the melting furnace through the fan, the air pressure H=18mmHg, and the air volume Q=520Hm 3 / h, hot air temperature 300°C, reducing atmosphere CO in the furnace 2 / CO=0.6 (volume ratio) After the material is dried and preheated, the solid content is 90%. Chemical decomposition is carried out at a high temperature of 1200°C, the hydroxide in the original material becomes an...

Embodiment 2

[0087] Composition of electroplating sludge: Cr(OH) 3 6.21%, Cu(OH) 2 0.55%, Zn(OH) 2 0.86%, Ni(OH) 2 0.42%, Fe(OH) 2 1.89%, moisture is 87.21%, and other impurities are 2.86%. After the above sludge is dried by a drum dryer, weigh 1 ton, weigh 0.7 tons of coke, 0.1 tons of quartz stone, 0.16 tons of limestone, 0.1 ton of water slag is lifted to the feeding platform by the hoist after being weighed and weighed. After being stirred evenly, it is evenly fed into the melting furnace through the feeding door. =550Hm 3 / h, the hot air temperature is 330°C, and the reducing atmosphere in the furnace is CO 2 / CO=0.74 (volume ratio) After the material is dried and preheated, the solid content is 95%. Chemical decomposition is carried out under the high temperature condition of 600°C, the hydroxide in the original material becomes oxide, and at the melting temperature of 1200°C, the material becomes liquid, in which the oxide is reduced to alloy by carbon monoxide or coke, a...

Embodiment 3

[0090] Composition of electroplating sludge: Cr(OH) 3 7.18%, Cu(OH) 2 0.67%, Zn(OH) 2 0.71%, Ni(OH) 2 0.37%, Fe(OH) 2 1.43%, moisture is 87.38%, and other impurities are 2.26%. After the above sludge is dried by a drum dryer, weigh 1 ton, weigh 0.88 tons of coke, 0.05 tons of dolomite, 0.16 tons of quartz stone, and 0.25 tons of water slag. Lift to the feeding platform, after stirring evenly, evenly feed into the melting furnace through the feeding door, the height of the material column in the furnace is 3 meters, the air pressure H=23mmHg, the air volume Q=600Hm 3 / h, hot air temperature 350°C, reducing atmosphere CO in the furnace 2 / CO=0.95 (volume ratio) After the material is dried and preheated, the solid content is 97%. Chemical decomposition is carried out under the high temperature condition of 800 °C, the hydroxide in the original material becomes oxide, and at the melting temperature of 1400 °C, the material becomes liquid, and the oxide is reduced to all...

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Abstract

The invention relates to a process for treating electroplating sludge. The invention not only can eliminate the poisonous and harmful substances in the electroplating sludge, but also solves the technical problem of high treatment cost. The resource treatment process of the electroplating sludge comprises the following steps: a, ingredients: after the electroplating sludge is dried by a dryer, it is mixed with flux and coke according to the weight ratio of 100:15~71:50~88 ; b. Smelting: Stir and mix the above-mentioned materials with a good proportion, put them into a melting furnace for smelting reduction smelting at a temperature of 1400°C to 1600°C, and release the nickel-copper alloy obtained by smelting reduction through the alloy port , The liquid slag is released from the slag outlet; c. Tail gas treatment: the tail gas obtained during the above smelting is treated by the purification system and then emptied. The present invention has fast main reaction speed, high nickel recovery rate, forward charging, low batching cost, and overcomes the viscous slag and easy formation of nodules during reduction smelting of electroplating sludge, difficulty in descending furnace charge, extremely short furnace life, and frequent death Furnace problem.

Description

technical field [0001] The invention relates to a treatment process of toxic industrial solid waste, in particular to a treatment process of electroplating sludge. Background technique [0002] Electroplating industrial sludge is the sediment produced during the treatment of electroplating sewage, and its main components are chromium, iron, copper, nickel, aluminum, zinc, magnesium, calcium, silicon, sulfur, cyanide, etc. Because it contains a large amount of toxic and harmful heavy metals, it is a controlled toxic industrial solid waste, and due to the development of modern industry, the discharge of electroplating sludge is increasing. If large-scale electroplating sludge is not properly treated, it will eliminate toxic and harmful waste. Substances will cause serious damage to the environment and endanger human health. [0003] Recycling of electroplating sludge, harmless treatment, and elimination of its secondary pollution to the environment have long been the focus of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/06
Inventor 李长友董永吉
Owner 台州盛世环境工程有限公司
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