System and method for extracting nickel carbonate from stainless steel acid pickling waste mixed acid

A waste mixed acid and nickel carbonate technology, applied in the direction of improving process efficiency, can solve the problems of low equipment start-up rate, large equipment investment, high operating cost, etc., and achieve fast liquid-solid separation speed, enhanced treatment effect, and fast settling speed Effect

Pending Publication Date: 2018-06-15
广西北港新材料有限公司
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Problems solved by technology

[0014] Compared with method 1 and method 2, although this method can recover useful substances in waste mixed acid, it has the problems of large equipment investment, high operating cost and limited processing scale
The reason is that the roasting furnace used works under the condition of high temperature and strong corrosion, which has strict requirements on the anti-corrosion performance of the equipment and high cost, and the life of other commonly used spare parts is short, and frequent replacement makes the operating rate of the equipment low
In addition, there is a high requirement for the content of insoluble particles in the waste mixed acid atomized into the roaster, otherwise it will easily cause the wall of the roaster to shut down, and the waste mixed acid discharged from the pickling line with a particle content exceeding the standard cannot enter the roaster and can only be used. and method processing, which limits the application scale of this method

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  • System and method for extracting nickel carbonate from stainless steel acid pickling waste mixed acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] This embodiment adopts figure 1 The system for extracting nickel carbonate from stainless steel pickling waste mixed acid; the method for extracting nickel carbonate from stainless steel pickling waste mixed acid is as follows:

[0119] (1) The first neutralization reaction: take 1000ml of waste mixed acid, add 25% sodium carbonate solution in mass percentage concentration to the waste mixed acid at a flow rate of 150ml / min, adjust the pH value to 4.5, and let it stand for 1h.

[0120] (2) The first separation: the first separation filter residue is obtained after the first separation, and the iron mass percentage content in the detection residue is 19.19%, the chromium mass percentage content is 2.11%, and the nickel mass percentage content is 0.46%.

[0121] (3) The second neutralization reaction: the first separated filtrate was continuously added with 25% sodium carbonate solution by mass percentage to adjust the pH value to 9.0.

[0122] (4) The second separation:...

Embodiment 2

[0130] This embodiment adopts figure 1 The system for extracting nickel carbonate from stainless steel pickling waste mixed acid; the method for extracting nickel carbonate from stainless steel pickling waste mixed acid is as follows:

[0131] (1) The first neutralization reaction: Take 2000ml of waste mixed acid, add saturated sodium carbonate solution to the waste mixed acid at a flow rate of 200ml / min, adjust the pH value to 5.5, and let it stand for 1h.

[0132] (2) The first separation: the first separation filter residue is obtained after the first separation, and the iron mass percentage content in the detection residue is 17.92%, the chromium mass percentage content is 1.67%, and the nickel mass percentage content is 1.4%.

[0133] (3) The second neutralization reaction: the first separated filtrate was continuously added with 25% sodium carbonate solution by mass percentage to adjust the pH value to 9.5.

[0134] (4) The second separation: the second separation and t...

Embodiment 3

[0142] This embodiment adopts figure 1 The system for extracting nickel carbonate from stainless steel pickling waste mixed acid; the method for extracting nickel carbonate from stainless steel pickling waste mixed acid is as follows:

[0143] (1) The first neutralization reaction: take 2000ml of waste mixed acid, add 25% sodium carbonate solution at a flow rate of 100ml / min to the waste mixed acid, adjust the pH value to 6.0, and let it stand for 1h.

[0144] (2) The first separation: the first separation filter residue is obtained after the first separation, and the iron mass percentage content in the detection residue is 20%, the chromium mass percentage content is 4.5%, and the nickel mass percentage content is 3%.

[0145] (3) The second neutralization reaction: the first separated filtrate was continuously added with 25% sodium carbonate solution by mass percentage to adjust the pH value to 9.8.

[0146] (4) The second separation: the second separation and the first pre...

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Abstract

The invention relates to the field of waste water treatment, in particular to a system and a method for extracting nickel carbonate from stainless steel acid pickling waste mixed acid. The system comprises a first neutralization reactor, a first separation device, a second neutralization reactor and a second separation device. The method comprises the steps of carrying out first neutralization reaction, carrying out first separation, carrying out second neutralization reaction, carrying out second separation and the like. According to the system and the method provided by the invention, through two-time neutralization reaction, nickel can be high-efficiently extracted from the waste mixed acid, and the extracted nickel raw material can be further used for preparing a nickel-ferro alloy ata low cost. According to the system and the method, various step parameters and various equipment are reasonably arranged and synergized, so that a waste mixed acid treatment effect and a nickel carbonate recovery effect are further improved.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a system and method for extracting nickel carbonate from stainless steel pickling waste mixed acid. The system and method are particularly suitable for waste mixed acid produced after stainless steel pickling. Background technique [0002] At present, during the processing of nickel-chromium stainless steel, pickling treatment is required to remove the oxide layer on the surface of the stainless steel. Pickling is divided into two stages: sulfuric acid pickling and mixed acid pickling prepared by nitric acid and hydrofluoric acid. The sulfuric acid pickling stage is mainly to remove iron oxide and chromium oxide, and the mixed acid pickling stage is to further remove chromium oxide and nickel oxide. The washed metal enters the acid solution. When the amount of metal ions entering the acid solution reaches a certain value, the pickling solution becomes invalid and is discharg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/36C22B7/00C22B23/00
CPCC22B7/006C22B23/0461C23G1/36Y02P10/20
Inventor 梅卫东黄庆周廖辉吴清海李翔黄学忠
Owner 广西北港新材料有限公司
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