Method for recovering nickel resource in waste acid system

A resource recovery and systematic technology, applied in the direction of chemical instruments and methods, nickel compounds, metallurgical wastewater treatment, etc., can solve the problems of shortened equipment life, secondary pollution, high cost, etc., and achieve improved recovery rate, cost saving, and low price Effect

A resource recovery and systematic technology, applied in the direction of chemical instruments and methods, nickel compounds, metallurgical wastewater treatment, etc., can solve the problems of shortened equipment life, secondary pollution, high cost, etc., and achieve improved recovery rate, cost saving, and low price Effect

CN113105020APending Publication Date: 2021-07-13瀚蓝工业服务(嘉兴)有限公司
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  • Method for recovering nickel resource in waste acid system

Examples

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Effect test

Embodiment 1

[0057] The waste acid system used is a phosphoric acid system with a nickel content of 9.93g / L, a total phosphorus of 2.09g / L, and an acidity (calculated as H3PO4) of 988g / L. The above-mentioned waste acid filtered through the precision filter reaches the stirring tank, slowly adds 15% milk of lime, adjusts the pH value of the feed liquid to 4.0, stirs for 20 minutes, puts it into a plate and frame filter press for pressure filtration, and obtains the filtrate A and the filter residue a. Filter residue A is processed by the Environmental Protection Agency; add 15% sodium hydroxide solution to filtrate A, adjust the pH value of the solution to 6.0, stir and react for 30 minutes, then add 15% sodium carbonate solution, adjust the pH value of the solution to 9.0, react for 30 minutes, Obtain the mixed solution; then add 10% sodium sulfide solution to the mixed solution, stir and react for 10 minutes, put it into the plate frame and press filter to obtain the filtrate B and nickel...

Embodiment 2

[0060] The waste acid system used is a nitric acid system, the nickel content is 14.7g / L, the total phosphorus is 4.12g / L, and the acidity (as HNO 3 Count) is 189g / L. The above-mentioned waste acid filtered through the precision filter reaches the stirring tank, slowly adds 15% milk of lime, adjusts the pH value of the feed liquid to 4.1, stirs for 20 minutes, puts it into a plate and frame filter press for pressure filtration, and obtains the filtrate A and the filter residue a. The filter residue A is treated by the Environmental Protection Agency; add 15% potassium hydroxide solution to the filtrate A, adjust the pH value of the solution to 8.0, stir and react for 20 minutes, then add 20% sodium bicarbonate solution, adjust the pH value of the solution to 11, and react for 30 minutes , to obtain a mixed solution; then add 15% sodium sulfide solution to the mixed solution, stir and react for 20 minutes, pour it into the plate frame and press filter to obtain filtrate B and ...

Embodiment 3

[0063] The waste acid system used is a nitric acid system, the nickel content is 18g / L, the total phosphorus is 5.65g / L, and the acidity (as HNO 3 Count) is 205g / L. Put the waste acid filtered through the precision filter into the mixing tank, slowly add 10% milk of lime, adjust the pH value of the feed liquid to 4.5, stir for 20 minutes, put it into a plate and frame filter press for pressure filtration, and obtain filtrate A and filter residue a. Treat the filter residue A by the Environmental Protection Agency; add 15% sodium hydroxide solution to the filtrate A, adjust the pH value of the solution to 7.0, stir and react for 30 minutes, then add 10% sodium bicarbonate solution, adjust the pH value of the solution to 10, and react for 20 minutes , to obtain a mixed solution; then add 15% composite alkali sulfide solution to the mixed solution, stir and react for 20 minutes, pour into the plate frame and press filter to obtain filtrate B and nickel slime, and the nickel slud...

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Abstract

The invention discloses a method for recovering nickel resource in a waste acid system. The method comprises the following steps: (1) adding a lime neutralizer into waste acid, adjusting the pH value to 4.0-4.5, reacting for 10-30 minutes, and carrying out filter pressing to obtain filtrate A and filter residues A; (2) adding a strong alkali neutralizer into the filtrate A, adjusting the pH value to 5.5-8.5, reacting for 30-60 minutes, adding a carbonate neutralizer, and adjusting the pH value to 9.0-11.0 to obtain a mixed solution; (3) adding a heavy metal remover into the mixed solution, stirring, and carrying out filter pressing to obtain filtrate B and nickel mud; and (4) drying and dehydrating the nickel mud to obtain a nickel product. According to the method, three-step neutralization is carried out by using different neutralizers in sequence, the recovery rate of nickel in the waste acid and the purity of nickel products can be effectively improved, pollution to the environment is reduced, the process of the recovery method is simple, the price of the used neutralizers is low, and the cost can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for recovering nickel resources in a waste acid system. Background technique [0002] Nickel is a carcinogenic heavy metal, but it is a relatively expensive metal resource, and its price is 2-4 times that of copper. With the accelerated development of the economy, my country's demand for nickel is also increasing. Since 2005, my country has become the country with the largest nickel consumption in the world, and currently 65% ​​of the world's nickel is used to produce stainless steel. With the rapid development of the stainless steel industry, the demand for nickel in the world is also increasing, and the supply is in short supply. [0003] At present, in the process of processing nickel-chromium stainless steel, pickling treatment is required to remove the oxide layer on the surface of stainless steel, resulting in a large amount of nickel-containing waste ac...

Claims

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Application Information

Patent Timeline
13 Jul 2021
Publication
CN113105020A
IPC
C02F9/04; C02F101/20; C02F103/16
CPC
C02F9/00; C01G53/00; C02F1/66; C02F2101/20; C02F2103/16
Inventors
杨东奎