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Method for reclaiming reagent-grade anhydrous sodium sulfate from basic nickel carbonate production waste liquor

A technology of anhydrous sodium sulfate and nickel carbonate, applied in alkali metal sulfite/sulfite, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as polluted water sources, waste of resources, and damage to the ecological environment, and achieve The effect of simple operation and mild process conditions

Active Publication Date: 2012-06-20
GUANGDONG GUANGHUA SCI TECH
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If this waste liquid is discharged directly, it will not only pollute the water source, damage the ecological environment, but also cause a waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Sampling the collected waste liquid produced in the production process of basic nickel carbonate to detect the content of anhydrous sodium sulfate and the content of impurities in each liter of waste liquid;

[0024] Anhydrous sodium sulfate: 248g / L

[0025] Nickel (based on metal content): 45.6mg / L

[0026] Ammonia: 12.2g / L

[0027] Sodium phosphate: 34.8mg / L

[0028] Sodium carbonate: 1.2g / L

[0029] (2) Nickel recovery: take 1000 ml of waste liquid, add 2.5 g of reagent grade sodium hydroxide while stirring until the pH of the waste liquid is 9-10, then stir at room temperature for 0.5 hours, filter to obtain the filter residue nickel hydroxide 70.2 mg, the filtrate is ready for use;

[0030] (3) Removal of ammonia: Use 3.5 g of reagent grade sodium hydroxide to adjust the pH of the waste liquid treated in step (2) to above 12, boil for 1.5 hours to catch ammonia, and set aside;

[0031] (4) Removal of phosphate and carbonate ions: Add 1.2 g of reagent grade...

Embodiment 2

[0035] (1) Sampling the collected waste liquid produced in the production process of basic nickel carbonate to detect the content of anhydrous sodium sulfate and the content of impurities in each liter of waste liquid;

[0036] Anhydrous sodium sulfate: 256g / L

[0037] Nickel (based on metal content): 50.3mg / L

[0038] Ammonia: 13g / L

[0039] Sodium phosphate: 40.5mg / L

[0040] Sodium carbonate: 1.4g / L

[0041] 2) Nickel recovery: Take 1000 ml of waste liquid, add 2.5 g of reagent grade sodium hydroxide while stirring until the pH of the waste liquid is 9-10, stir at room temperature for 0.8 hours, filter, and obtain 75.5 mg of nickel hydroxide on the filter residue , the filtrate is standby;

[0042] (3) Removal of ammonia: Use 3.5 g of reagent grade sodium hydroxide to adjust the pH of the waste liquid treated in step (2) to above 12, boil for 1.5 hours to catch ammonia, and set aside;

[0043] (4) Removal of phosphate and carbonate ions: Add 1.4 g of reagent grade calc...

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Abstract

The invention provides a method for reclaiming reagent-grade anhydrous sodium sulfate from basic nickel carbonate production waste liquor. The method comprises the following steps of: adding sodium hydroxide into the waste liquor till the pH value of the waste liquor is 9 to 10, filtering to remove nickel impurity, regulating the pH value of the filtrate to be over 12 by using sodium hydroxide, and boiling to remove ammonia; and adding excessive calcium hydroxide into the solution, stirring, heating till micro boiling, adding a proper amount of active carbon, filtering to remove phosphate andcarbonate, meanwhile, regulating the pH value of the filtrate to be 7-8 by using concentrated sulfuric acid, adding a proper amount of sodium carbonate, stirring, boiling, and removing redundant calcium hydroxide; and regulating the pH value of the clear solution to be 5-6 by using the concentrated sulfuric acid, concentrating, crystallizing, and thus obtaining the reagent-grade anhydrous sodium sulfate. The method for reclaiming the reagent-grade anhydrous sodium sulfate is easy to operate and mild in process conditions, various impurities in the waste liquor can be effectively removed, the comprehensive recovery rate reaches over 90 percent, and the inspection shows that the obtained product accords with the analytically pure standards of chemical reagents. By treatment and comprehensive utilization of the waste liquor, the reagent-grade anhydrous sodium sulfate is reclaimed, and the aims of saving energy, reducing emission, reducing environmental pollution and reducing the production cost are fulfilled.

Description

technical field [0001] The present invention relates to a kind of production method of anhydrous sodium sulfate, relate in particular to a kind of method that reclaims anhydrous sodium sulfate from basic nickel carbonate production waste liquid, more specifically relate to a kind of by nickel sulfate solution and alkali metal carbonate The invention discloses a method for recovering reagent-grade anhydrous sodium sulfate from waste liquid produced in the process of solution production of basic nickel carbonate. Background technique [0002] Anhydrous sodium sulfate, commonly known as Yuanmingfen, anhydrous Glauber's salt, is one of the bulk products of the inorganic salt industry. Anhydrous sodium sulfate is in the form of white uniform fine particles or powder, with a relative density of 2.68, a melting point of 884°C, and a hexagonal crystal at 241°C; anhydrous sodium sulfate is soluble in water and glycerin, but insoluble in ethanol, and easily absorbs moisture when expos...

Claims

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Application Information

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IPC IPC(8): C01D5/00
Inventor 李明谭泽陈汉昭黄司平黄永润周一朗陈旭波
Owner GUANGDONG GUANGHUA SCI TECH
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