Method for recovering reagent level anhydrous sodium sulfate from raffinate obtained in process of extracting nickel from nickel sulfate solution
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A technology of anhydrous sodium sulfate and raffinate, applied in alkali metal sulfite/sulfate dehydration, alkali metal sulfite/sulfate purification, etc., can solve low recovery rate, complex process, poor product color, etc. problems, to achieve the effect of mild process conditions and simple operation
Inactive Publication Date: 2013-01-23
GUANGDONG GUANGHUA SCI TECH
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Anhydrous sodium sulfate is in the form of white uniform fine particles or powder, and is mainly used as a filler for synthetic detergents, a cooking agent in the paper industry, and a laxative in the pharmaceutical industry; the main production methods of anhydrous sodium sulfate are: vacuum evaporation, calcium Glauber's salt met
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Embodiment 1
[0027] (1) Take the collected raffinate produced in the production process of nickel sulfate extraction with P204, sample and detect the content of anhydrous sodium sulfate and the content of impurities in each liter of raffinate as follows:
[0028] Anhydrous sodium sulfate: 203g / L
[0029] Heavy metal ion: 26mg / L
[0030] Chloride ion: 96mg / L
[0031] Phosphate ion: 37mg / L
[0032] (2) Removal of organic matter: Take 1000 ml of raffinate, add 20 g of hydrogen peroxide while stirring, heat to 60°C, keep for 2 hours, add appropriate amount of activated carbon for adsorption, and filter to obtain the filtrate;
[0033] (3) Removal of heavy metal ions: add 105 mg of sodium sulfide to the solution obtained in step (2), stir at room temperature for 1.5 hours, add an appropriate amount of activated carbon to adsorb and filter to obtain a filtrate;
[0034] (4) Removal of excess sulfide and chloride ions: Add 840 mg of sodium persulfate to the solution obtained in step (3), stir and slowly heat...
Embodiment 2
[0040] (1) Take samples of the collected raffinate produced during the production process of nickel sulfate extraction with P204 to detect the content of anhydrous sodium sulfate and the content of impurities in each liter of raffinate;
[0041] Anhydrous sodium sulfate: 218g / L
[0042] Heavy metals: 32mg / L
[0043] Chloride ion: 102mg / L
[0044] Phosphoric acid and ion: 30mg / L
[0045] (2) Removal of organic matter: take 1000 ml of raffinate, add 40 g of hydrogen peroxide while stirring, heat to 70°C, keep it for 3 hours, add an appropriate amount of activated carbon for adsorption, and filter to obtain a filtrate;
[0046] (3) Removal of heavy metal ions: add 160 mg of sodium sulfide to the filtrate obtained in step (2), stir at room temperature for 2.5 hours, add an appropriate amount of activated carbon for adsorption, and filter to obtain a filtrate;
[0047] (4) Removal of excess sulfide ions and chloride ions: add 1.3 g of sodium persulfate to the filtrate obtained in step (3), sti...
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Abstract
The invention provides a method for recovering reagent level anhydrous sodium sulfate from raffinate obtained in a process of extracting nickel from a nickel sulfate solution by adopting bi(2-ethylhexyl)phosphate (P204) as an extracting agent. The method comprises the following steps of: firstly adding a certain amount of hydrogen peroxide in raffinate for gently heating and insulating, and adding active carbon for absorbing and filtering to remove a small amount of organic matters; then adding excessive sodium sulphide in filtrate to remove heavy metal ions such as nickel and the like, adding sodium persulfate to remove excessive sulphur ions and chloride ions in a system, adding excessive calcium hydroxide in the filtrate to remove phosphate radical ions, and removing excessive calcium hydroxide by using sodium carbonate; and finally, after regulating the pH value of the filtrate by using concentrated sulfuric acid to 5-6, concentrating and crystallizing, centrifuging while heating, and drying to obtain the reagent level anhydrous sodium sulfate. The method for recovering the reagent level anhydrous sodium sulfate is simple in operation and is mild in process conditions, and can be used for effectively removing various kinds of impurities in the raffinate with a comprehensive recovering rate of above 90 percent; and the obtained reagent level anhydrous sodium sulfate accords with the analytically pure standards of chemical reagents through testing. According to the invention, through processing and comprehensively utilizing the raffinate, the reagent level anhydrous sodium sulfate is recovered, and the purposes of saving energy, reducing emission, reducing environmental pollution and lowering production cost are achieved.
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 of reclaiming reagent grade anhydrous sodium sulfate from the raffinate of nickel sulfate solution extraction nickel, more specifically relate to a kind of Hexyl) phosphoric acid (referred to as P204) as an extractant to recover reagent-grade anhydrous sodium sulfate from the raffinate of nickel sulfate solution. 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, and is mainly used as a filler for synthetic detergents, a cooking agent in the paper industry, and a laxative in the pharmaceutical industry; the main production methods of anhydrous sodium sulfate are: vacuum evaporation, calcium Glauber's salt method, conversi...
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