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Resource recycling process for nickel-containing sludge in electroplating enterprises

A resource and sludge technology, applied in sludge treatment, nickel oxide/nickel hydroxide, water/sludge/sewage treatment, etc., can solve waste of resources, pollute the environment, and nickel-containing sludge cannot be recycled and utilized and other issues to achieve the effect of reducing pollution, low energy consumption and realizing value

Inactive Publication Date: 2011-09-07
苏州市环境工程有限责任公司
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Problems solved by technology

[0005] The invention provides a recycling process for nickel-containing sludge in electroplating enterprises, aiming to solve the problems that the nickel-containing sludge produced in electroplating enterprises cannot be recycled and utilized, resources are wasted, and the environment is polluted

Method used

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  • Resource recycling process for nickel-containing sludge in electroplating enterprises
  • Resource recycling process for nickel-containing sludge in electroplating enterprises

Examples

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Embodiment 1

[0030] Embodiment 1: A resource recovery process of nickel-containing sludge in electroplating enterprises

[0031] see attached figure 1 As shown, a resource recovery process of nickel-containing sludge in electroplating enterprises, the specific steps are as follows:

[0032] (1) Roasting and purification

[0033] The water content of nickel-containing sludge after pressure filtration is 73%, and the sludge also contains a small amount of organic matter. The sludge is roasted in the roasting furnace, the roasting temperature is controlled to be 600-700 °C, and the roasting time is 6 hours. After roasting, the water and organic matter can be burned off, and the water can be basically completely burned off. The organic matter lost by burning accounts for the dry basis of the sludge. about 30% of the weight. After the sludge is roasted, it can effectively reduce the moisture and organic matter in the sludge, realize the reduction of the sludge, and reduce the amount of chemi...

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Abstract

The invention relates to a resource recycling process for nickel-containing sludge in electroplating enterprises. In the process, the nickel-containing sludge generated in the electroplating enterprises is used as a treatment target, and nickel in the sludge is subjected to resource recycling treatment by a calcining, acid leaching, impurity removing and alkaline precipitating combined method. The process comprises the following steps of: calcining and purifying the nickel-containing sludge to remove moisture and organic matters from the sludge; crushing calcined residues, and leaching by using sulfuric acid solution; electrolyzing leaching liquid to remove copper, and removing ferrum, calcium and magnesium impurities by a chemical precipitation method; and alkalifying to obtain nickel hydroxide precipitates so as to recover the nickel in the sludge. In the resource recycling process, the removal rate of the impurities is more than 99 percent, the recovery rate of the nickel is more than 96 percent, the pollution of the sludge to environment is reduced, the value of the sludge is realized, and environmental and economic benefits are obvious.

Description

technical field [0001] The invention relates to a recycling process for nickel-containing sludge in electroplating enterprises, in particular to a process for treating nickel-containing sludge produced in electroplating enterprises by a combined method of roasting, sulfuric acid leaching, impurity removal and alkali precipitation. Background technique [0002] The electroplating industry is an important processing industry in my country and is widely distributed in various industries. However, different types of plating and products must use a large number of heavy metals such as gold, silver, copper, nickel, chromium, zinc, iron, cadmium, etc. as raw materials , During the electroplating process, some heavy metals will enter the wastewater. According to incomplete statistics, the amount of electroplating wastewater in my country is about 4 billion m3 3 / year, which is equivalent to the supply of tap water in several large and medium-sized cities, and is one of the key pollu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C01G53/04B09B3/00
Inventor 沈华顾余陈慧科
Owner 苏州市环境工程有限责任公司
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