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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 huge investment in equipment, high energy consumption, serious environmental pollution, and equipment utilization. Not high, limited production, etc.
[0004] At present, for these low-grade nickel oxide ores, either a huge amount of money is invested in deep smelting, which is costly and economically ineffective; or they are not used or developed at all, especially for the chromium-nickel sludge produced by stainless steel production enterprises. If it is not recycled, it must be discharged, resulting in environmental pollution

Method used

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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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Embodiment 1

[0020] Get low-grade stainless steel sludge 1000kg, Ni1.4% wherein, Cr 2%, according to figure 1 The process step is to use reclaimed water first for beating treatment, and the low-grade stainless steel sludge and reclaimed water are completely mixed evenly, wherein the mixing mass ratio of reclaimed water and low-grade stainless steel sludge is 4:1, and then go to beating treatment Add pickling waste mother liquor to the finished slurry for extraction treatment, and consume 660kg of scrap mother liquor through this process until the pH in the slurry is 2.0; then add reclaimed water to the intermediate pool for standby, and then put the waste in the intermediate pool Reclaimed water 2 is mixed with the slurry after leaching treatment, reacts in reaction tank 1, and adds calcium hydroxide in reaction tank 1 until the pH in reaction tank 1 is 3.5, then stops adding calcium hydroxide; The amount of reclaimed water 2 is ten times that of reclaimed water 1, about 44 tons; after the...

Embodiment 2

[0022] By the same method of embodiment 1, the calcium hydroxide wherein is replaced with calcium oxide, the low-grade stainless steel sludge 1000kg that is used, Ni 2.1% wherein, Cr 2.2%, consume scrap mother liquor 660kg through this process treatment, the amount of reclaimed water 44 tons, produced 766kg of waste sludge, of which Ni 0.45%, Cr 0.90%, and produced 234kg of chrome-nickel crude product, of which Ni 7.5%, Cr 6.46%.

[0023] Because the price of ore slime or stainless steel sludge with different nickel content is quite different when they are reused for the second time, so by the treatment process of the present invention, the problem of no use value or high cost of the general nickel treatment process can be solved. 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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