Technology for recycling nickel sulfate from nickel slag

A technology of nickel sulfate and nickel slag, applied in the direction of nickel sulfate, process efficiency improvement, etc., can solve the problems of mother liquor cannot be recycled, waste of sulfuric acid and alkali, consumption of acid and alkali, etc., to save resources, reduce environmental pollution, The effect of reducing the generation of waste liquid

Inactive Publication Date: 2017-05-31
山东飞源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing process of adding alkali to remove impurities by using nickel-containing waste residue to generate crystals such as nickel sulfate, the sulfuric acid in the acidolysis solution is excessive, and neutralization reaction must first occur when adding alkali to remove impurities, so that sulfuric acid and alkali cause a large At the same time, a large amount of waste liquid is produced, which pollutes the environment
[0004] CN 103922428 A discloses a regeneration treatment method for nickel-containing waste. In the method, it is mentioned that the molar ratio of the nickel catalyst to the substance in the sulfuric acid solution is 1:1 to 1.5, which enables the n

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Get 500g nickel slag, and the crusher is broken into powder;

[0027] (2) adding sulfuric acid solution to dissolve, stirring and reacting for 2 hours while keeping the temperature at 70° C., and filtering to obtain filtrate A1;

[0028] (3) Filtrate A1 is cooled and crystallized to obtain crude nickel sulfate crystals and mother liquor A1, and redissolve the crude nickel sulfate crystals with pure water to obtain solution B1;

[0029] (4) Add hydrogen peroxide in solution B1, then add sodium hydroxide solution to adjust the pH of the solution to 3.0, filter and remove the precipitate, and obtain pure nickel sulfate solution;

[0030] (5) Cool and recrystallize the pure nickel sulfate solution to obtain nickel sulfate crystals and mother liquor B1 with a purity of 98.28%.

Embodiment 2

[0032] (1) Get 500g nickel slag, and the crusher is broken into powder;

[0033] (2) add sulfuric acid solution to dissolve, keep the temperature at 85°C for 2 hours, and filter to obtain filtrate A2;

[0034] (3) Filtrate A2 is cooled and crystallized to obtain crude nickel sulfate crystals and mother liquor A2, and redissolve the crude nickel sulfate crystals with pure water to obtain solution B2;

[0035] (4) Add hydrogen peroxide in solution B2, then add sodium hydroxide solution to adjust the pH of the solution to 3.0, filter and remove the precipitate, and obtain pure nickel sulfate solution;

[0036] (5) cooling and recrystallizing the pure nickel sulfate solution to obtain nickel sulfate crystals with a purity of 98.45% and mother liquor B2.

Embodiment 3

[0038] (1) Get 500g nickel slag, and the crusher is broken into powder;

[0039] (2) adding sulfuric acid solution to dissolve, stirring and reacting for 2 hours while keeping the temperature at 75° C., and filtering to obtain filtrate A3;

[0040] (3) Filtrate A3 is cooled and crystallized to obtain crude nickel sulfate crystals and mother liquor A3, and the crystals are redissolved with pure water to obtain solution B3;

[0041] (4) Add hydrogen peroxide in solution B3, then add sodium hydroxide solution to adjust the pH of the solution to 3.0, filter and remove the precipitate, and obtain pure nickel sulfate solution;

[0042] (5) cooling and recrystallizing the pure nickel sulfate solution to obtain nickel sulfate crystals with a purity of 98.32% and mother liquor B3.

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Abstract

The invention belongs to the technical field of resource recycling, and particularly relates to a technology for recycling nickel sulfate from nickel slag. The nickel slag is crushed into powder through a crusher; the powder is dissolved by adding a sulfuric acid solution, and filter liquor A is obtained through filtering after stirring; the obtained filter liquor A is cooled and crystallized, crude nickel sulfate crystals and mother liquor A are obtained, then pure water is used for dissolving the crude nickel sulfate crystals, and a solution B is obtained; hydrogen peroxide is added in the solution B or the solution B is inflated with oxygen, a sodium hydroxide solution is added for pH adjustment, sediments are removed through filtering, and a pure nickel sulfate solution is obtained; and the pure nickel sulfate solution is recrystallized, and nickel sulfate crystals and mother liquor B are obtained. The technology solves the problem of the reaction of excessive sulfuric acid and alkali, a large number of resources are saved, economic benefits are obvious, and environment pollution is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of resource recovery and utilization, and in particular relates to a process for recovering nickel sulfate from nickel slag. Background technique [0002] In recent years, with the continuous development of the electronics industry, electronic special gas tungsten hexafluoride (WF 6 ) demand has been increasing year after year, and solid nickel waste is produced in the production process, which also brings problems such as heavy metal pollution and resource recycling. [0003] In the existing process of adding alkali to remove impurities by using nickel-containing waste residue to generate crystals such as nickel sulfate, the sulfuric acid in the acidolysis solution is excessive, and neutralization reaction must first occur when adding alkali to remove impurities, so that sulfuric acid and alkali cause a large At the same time, a large amount of waste liquid is produced, which pollutes the environment. [...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B23/00C01G53/10
CPCC01G53/10C22B7/007C22B23/043C22B23/0461Y02P10/20
Inventor 郭鹏田玲玲李文齐向东
Owner 山东飞源科技有限公司
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