A kind of processing method of sodium sulfate wastewater

A treatment method, sodium sulfate technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve high sodium ion concentration, low recovery rate of sulfate ion and sodium ion and other issues to achieve the effect of low energy consumption and high added value

Active Publication Date: 2015-08-12
广东宇星阻燃新材股份有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fundamental disadvantages of these two methods are: the recovery rate of sulfate ion and sodium ion is low, and the concentration of sodium ion in the treated water is still high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A treatment method for sodium sulfate waste water, comprising the following steps:

[0030] (1) Take 1L of sodium sulfate wastewater with a concentration of 1.25mol / L, add 70g of calcium oxide to the sodium sulfate wastewater, react for 24 hours, and then filter to obtain calcium sulfate precipitate and sodium hydroxide solution; rinse the calcium sulfate precipitate twice Post-drying, obtains calcium sulfate solid 167g, and theoretical yield is 98.23%, and the rate of recovery of sulfate ion after conversion reaches 98.23%;

[0031] (2) After mixing the eluent and sodium hydroxide solution, add 283 g of phosphoric acid with a mass fraction of 85% to the mixed solution to obtain a sodium dihydrogen phosphate solution;

[0032] (3) Add 200g of zinc oxide to the sodium dihydrogen phosphate solution obtained in step (2), react for 4 hours, and then filter to obtain the sodium zinc phosphate precipitate and filtrate; rinse the sodium zinc phosphate precipitate once and dry ...

Embodiment 2

[0034] A treatment method for sodium sulfate waste water, comprising the following steps:

[0035] (1) Take 1L of sodium sulfate wastewater with a concentration of 1.25mol / L, add 214g of barium hydroxide to the sodium sulfate wastewater, react for 4 hours, and then filter to obtain barium sulfate precipitate and sodium hydroxide solution; rinse the barium sulfate precipitate for 2 Dry after the second time, obtain barium sulfate solid 290g, theoretical yield is 99.57%, after conversion, the recovery rate of sulfate ion reaches 99.57%;

[0036] (2) After mixing the eluent and sodium hydroxide solution, add 200g of metaphosphoric acid to the mixture to obtain sodium dihydrogen phosphate solution;

[0037] (3) Add 312g of zinc carbonate to the sodium dihydrogen phosphate solution obtained in step (2), react for 16 hours, and then filter to obtain the sodium zinc phosphate precipitate and filtrate; rinse the sodium zinc phosphate precipitate once and dry it , 454g of sodium zinc ...

Embodiment 3

[0039] A treatment method for sodium sulfate waste water, comprising the following steps:

[0040] (1) Take 1L of sodium sulfate wastewater with a concentration of 1.25mol / L, add 292g of calcium dihydrogen phosphate to the sodium sulfate wastewater, react for 24 hours, and then filter to obtain calcium sulfate precipitate and sodium dihydrogen phosphate solution; Dry after washing 2 times to obtain calcium sulfate solid 166g, the theoretical yield is 97.65%, and the recovery rate of sulfate ion after conversion reaches 97.65%; the eluent is mixed with sodium dihydrogen phosphate solution, and enters the next step;

[0041] (2) Add 243g of zinc hydroxide to the sodium dihydrogen phosphate solution obtained in step (1), react for 8 hours, and then filter to obtain the sodium zinc phosphate precipitate and filtrate; rinse the sodium zinc phosphate precipitate once and bake Dry to obtain sodium zinc phosphate solid 447g, the theoretical yield is 97.49%, the recovery rate of sodium...

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Abstract

The invention discloses a processing method of sodium sulfate wastewater. The processing method comprises the following steps: adding a chemical precipitator into the sodium sulfate wastewater, and filtering reaction liquid, so as to obtain sulfate precipitates and a sodium dihydrogen phosphate solution; adding zinc-containing substances into the sodium dihydrogen phosphate solution, reacting for 2-24 hours, and filtering the reaction liquid, so as to obtain sodium zinc phosphate precipitates and filter liquid. According to the processing method, the sulfate precipitates and the high-additional-value sodium zinc phosphate can be obtained, and the recovery rates of sulfate ions and sodium ions can reach above to 99.3%.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a treatment method for sodium sulfate waste water. Background technique [0002] Sodium sulfate-containing wastewater is a common source of pollution in many industries. If it is discharged directly into the natural environment without purification treatment, it will cause the salinity of the water body and soil to increase, destroy the soil structure, and cause soil compaction, which is not conducive to animals and plants. growth and pollute the environment. At present, there are roughly two treatment methods for sodium sulfate wastewater: one is to add lime water to generate calcium sulfate precipitation and sodium hydroxide solution; the other is to concentrate and crystallize it to extract sodium sulfate. Obviously, these two methods can only obtain industrial products with low added value; if you want to prepare dry products, the energy consumption is very h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C01B25/45B01J27/18
Inventor 罗宏波马访中甄利军罗章志刘敏顾湘
Owner 广东宇星阻燃新材股份有限公司
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