Method for extracting chromated nickel from low-grade stainless steel sludge by using stainless steel acid-washing waste mother liquor

A stainless steel, low-grade technology, applied in the field of chemical treatment, can solve the problems of low utilization rate of equipment, high energy consumption, poor economic benefits, etc., to achieve significant economic effects, reduce environmental pollution, and realize the effect of economic value

Active Publication Date: 2011-09-14
陈宇青
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Problems solved by technology

According to reports, the utilization of nickel oxide ore in the world is mainly to extract nickel metal through wet smelting or electric submerged arc furnace smelting. Both methods have defects, such as: the requirements for raw ore grade are too high, and the ratio of silicon to magnesium, There are certain requirements for the ferrosilicon ratio; the comprehensive utilization rate of the raw ore is extremely low, and many metal elements are discarded together with the slag, resulting in serious waste; in addition, there are

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  • Method for extracting chromated nickel from low-grade stainless steel sludge by using stainless steel acid-washing waste mother liquor
  • Method for extracting chromated nickel from low-grade stainless steel sludge by using stainless steel acid-washing waste mother liquor

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Example Embodiment

[0019] Example 1

[0020] Take 1000kg of low-grade stainless steel sludge, of which Ni1.4%, Cr 2%, press figure 1 In the described process steps, first use reclaimed water for beating treatment, low-grade stainless steel sludge and reclaimed water are completely mixed uniformly, wherein the mixing mass ratio of reclaimed water to low-grade stainless steel sludge is 4:1, and then beating treatment Add the waste pickling mother liquor to the slurry for leaching treatment. After this process, 660kg of the scrap mother liquor is consumed until the pH in the slurry is 2.0; then the intermediate water 2 is added to the intermediate tank for standby, and then the intermediate tank The reclaimed water 2 is mixed with the leached slurry, and the reaction is carried out in the reaction tank 1, and calcium hydroxide is added to the reaction tank 1 until the pH in the reaction tank 1 is 3.5, then the calcium hydroxide is stopped; The amount of reclaimed water 2 is ten times that of reclaime...

Example Embodiment

[0021] Example 2:

[0022] According to the same method as in Example 1, the calcium hydroxide is replaced by calcium oxide. The low-grade stainless steel sludge used is 1000kg, which contains 2.1% Ni and 2.2% Cr. This process consumes 660kg of scrap mother liquor and the amount of reclaimed water. 44 tons, produced 766kg of bottom mud, of which Ni 0.45%, Cr 0.90%, and produced 234kg of crude chromium nickel, of which Ni 7.5% and Cr 6.46%.

[0023] Since the price of sludge or stainless steel sludge with different nickel content differs greatly during secondary reuse, the treatment process of the present invention can solve the problem of no use value or high cost through a general nickel treatment process. Effectively realize the double benefits of economy and environment.

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Abstract

The invention discloses a chemical processing method, in particular to a method for extracting chromated nickel from low-grade stainless steel sludge by using stainless steel acid-washing waste mother liquor. By the method, low-grade nickel oxide ores are converted into high-grade nickel oxide ores. The method comprises the following steps of: making slurry of low-grade nickel and chromium sludge from stainless steel manufacturing enterprises by using recycled water; regulating the pH value by using the acid-washing waste mother liquor, and regulating the pH value by using calcium hydroxide or calcium oxide sectionally; discarding sludge in a reaction tank I, and reserving materials in a reaction tank II; and recycling active ingredients in a mechanical filtering mode. The method has the advantages that the operation is simple, equipment investment is small, raw materials are popularized, environmental pollution can be reduced, and the economic benefit is obvious. The method can be widely applied to a large number of stainless steel manufacturing enterprises or low-grade nickel ores.

Description

technical field [0001] The invention relates to a chemical treatment method, in particular to a method for extracting chromium and nickel in low-grade stainless steel sludge with stainless steel pickling waste mother liquor, so that low-grade ones become high-grade ones. technical background [0002] At present, the nickel ore identified in the world mainly exists in the form of nickel oxide ore, but in the deposit, the content of nickel oxide in the ore is relatively low, generally only 1.0-2.0wt%, so temporarily Not of practical value. Nickel is of great value in industry, especially high-grade nickel, which is more widely used. There are also some stainless steel production enterprises that produce a large amount of sludge with low nickel content in the subsequent process of production. If it is not treated, it will pollute the environment, and the cost of direct smelting is too high. It can be seen that how to recycle low-grade nickel oxide or stainless steel sludge is...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/06C22B3/44C22B23/00C22B34/32
CPCY02P10/20
Inventor 陈启松许谨杨辉方伟文陈宇青
Owner 陈宇青
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