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Process for producing sodium sulfate and sodium chloride in Na2SO4-NaCl-H2O system

A sodium sulfate and sodium chloride technology, applied in the purification of alkali metal sulfite/sulfate, alkali metal halide purification, etc., can solve the problem of sodium sulfate and sodium chloride content changes, low raw material recovery rate, environmental impact, etc. question

Inactive Publication Date: 2007-04-11
CHINA LIGHT IND INT ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Known from Na 2 SO 4 --NaCl-H 2 The methods for producing sodium sulfate and sodium chloride in the O system include the method of recovering the mother liquor of evaporative salt production and the method of discharging the mother liquor of evaporative salt production, but the recovery method of the mother liquor of evaporative salt production requires Na in the raw material. 2 SO 4 The content of NaCl is less than that of NaCl, and the discharge method of nitrate mother liquor by evaporation requires Na in the raw material 2 SO 4 The content of content is more than the content of NaCl, the raw material recovery rate is low and the problem that affects environment, therefore, above-mentioned two methods are difficult to adapt to NaCl 2 SO 4 --NaCl-H 2 O system sodium sulfate and sodium chloride content changes greatly

Method used

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Examples

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Effect test

Embodiment 1

[0011] Embodiment 1: a kind of from Na 2 SO 4 --NaCl-H 2 The technique of producing sodium sulfate and sodium chloride in the O system comprises the following steps:

[0012] 1. Take 100m 3 Na 2 SO 4 --NaCl-H 2 O system raw materials, the component concentrations are: NaCl 300g / l, NaCl 2 SO 4 20g / l, the above-mentioned brine is evaporated, the evaporation temperature is 68°C, and then solid-liquid separation is carried out to obtain 19.3 tons of sodium chloride and 36.4m of evaporated mother liquor 3 , the concentration of the evaporated mother liquor components is: NaCl 294g / l, NaCl 2 SO 4 55g / l;

[0013] 2. Evaporate the above-mentioned evaporation mother liquor and circulating nitrate mother liquor at low temperature and perform solid-liquid separation to obtain 156.3m salt mother liquor 3 and 10.7 tons of sodium chloride, the evaporation temperature is 48°C, and the concentration of the components of the salt mother liquor is: NaCl 290g / l, NaCl 2 SO 4 64g / l...

Embodiment 2

[0015] Embodiment 2: a kind of from Na 2 SO 4 --NaCl-H 2 The technique of producing sodium sulfate and sodium chloride in the O system comprises the following steps:

[0016] 1. Take 100m 3 NaCl-Na 2 SO 4 -H 2 O system raw materials, the component concentrations are: NaCl 179g / l, NaCl 2 SO 4 181g / l, the above raw materials are evaporated, the evaporation temperature is 63 ° C, and then solid-liquid separation is carried out to obtain 14.5 tons of sodium sulfate in the raw material and 62.1 m of evaporated mother liquor 3 , the concentration of the evaporated mother liquor components is: NaCl 290g / l, NaCl 2 SO 4 56g / l;

[0017] 2. Low-temperature evaporation of the above-mentioned evaporation mother liquor and circulating nitrate mother liquor and solid-liquid separation to obtain 247.5m salt mother liquor 3 and 18 tons of sodium chloride, the evaporation temperature is 45°C, and the concentration of the components of the salt mother liquor is: NaCl 286g / l, NaCl 2...

Embodiment 3

[0019] Embodiment 3: a kind of from Na 2 SO 4 --NaCl-H 2 The technique of producing sodium sulfate and sodium chloride in the O system comprises the following steps:

[0020] 1. Take 100m 3 Na 2 SO 4 --NaCl-H 2 O system raw materials, the concentration of the components is: NaCl 20g / l, NaCl 2 SO 4 340g / l, the above raw materials are evaporated, the evaporation temperature is 62°C, and then solid-liquid separation is carried out to obtain 33.6 tons of sodium sulfate in the raw materials and 6.9m of evaporated mother liquor 3 , the concentration of the evaporated mother liquor components is: NaCl 291g / l, NaCl 2 SO 4 57g / l):

[0021] 2. Low-temperature evaporation of the above-mentioned evaporation mother liquor and circulating nitrate mother liquor and solid-liquid separation to obtain the salt mother liquor 38.5m 3 and 2 tons of sodium chloride, the evaporation temperature is 50°C, and the concentration of the salt mother liquor components is: NaCl 292g / l, NaCl 2 ...

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Abstract

The process of producing sodium sulfate and sodium chloride in a Na2SO4-NaCl-H2O system belongs to the field of mixed inorganic solution evaporating separation technology. Mixed solution of sodium sulfate and sodium chloride as material is first evaporated and then separated to obtain sodium sulfate, sodium chloride and evaporated mother liquor; the evaporated mother liquor is low temperature evaporated and separated to obtain sodium chloride and salt-making mother liquor; and the salt-making mother liquor is evaporated and separated to obtain sodium sulfate and saltpeter-making mother liquor. The present invention has the features of high main and side product quality, high material adaptability, low cost, low cost, no waste draining, etc.

Description

technical field [0001] The invention belongs to the technical field of evaporation and separation of inorganic salt mixed solution, especially a kind of method from NaCl-Na 2 SO 4 -H 2 Process for producing sodium sulfate and sodium chloride in O system. Background technique [0002] Known from Na 2 SO 4 --NaCl-H 2 The methods for producing sodium sulfate and sodium chloride in the O system include the method of recovering the mother liquor of evaporative salt production and the method of discharging the mother liquor of evaporative salt production, but the recovery method of the mother liquor of evaporative salt production requires Na in the raw material. 2 SO 4 The content of NaCl is less than that of NaCl, and the discharge method of nitrate mother liquor by evaporation requires Na in the raw material 2 SO 4 The content of content is more than the content of NaCl, the raw material recovery rate is low and the problem that affects environment, therefore, above-ment...

Claims

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Application Information

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IPC IPC(8): C01D5/16C01D3/14
Inventor 彭赛军
Owner CHINA LIGHT IND INT ENG CO LTD
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