Method for preparing sodium carbonate from sodium sulfate

A process method, sodium sulfate technology, applied in chemical instruments and methods, alkali metal compounds, alkali metal carbonates, etc., can solve the problems of salt loss environment, inability to utilize sodium sulfate in ammonia-alkali process, pollution, etc. Economic benefits, the effect of reducing waste water discharge and reducing discharge pollution

Inactive Publication Date: 2016-11-09
史永军 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Existing ammonia soda method soda ash production technology, take sodium chloride as the main raw material of sodium, its main process see image 3 , while sodium chloride and sodium sulfate mostly belong to associated salt mines, sodium sulfate has been unable to be utilized in th...

Method used

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  • Method for preparing sodium carbonate from sodium sulfate
  • Method for preparing sodium carbonate from sodium sulfate
  • Method for preparing sodium carbonate from sodium sulfate

Examples

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Embodiment Construction

[0010] A process method for preparing soda ash with sodium sulfate, the specific process is:

[0011] It uses sodium sulfate and limestone as the main raw materials, chloride ions and ammonia as intermediate media in the process, and the main products are sodium carbonate and gypsum.

[0012] On the basis of the existing ammonia-soda production system, the sodiumization reaction of sodium sulfate and calcium chloride and the filtration and separation of gypsum are added to realize the process of producing soda ash with sodium sulfate as a raw material. The main by-products are gypsum (CaSO 4 . 2H 2 O).

[0013] Sodium reaction equation:

[0014] Na 2 SO 4 +CaCl 2 +2H 2 O=2NaCl+CaSO 4 .2H 2 O↓ (precipitation)

[0015] Reaction equation of ammonia absorption carbonization:

[0016] NaCl+NH 3 +H 2 O+CO 2 =NaHCO 3 +NH 4 Cl

[0017] Deamination reaction equation:

[0018] 2NH 4 Cl+Ca(OH) 2 = 2NH 3 +2H 2 O+CaCl 2

[0019] In the ammonia-soda soda process, the main components of the mother liquo...

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Abstract

The invention relates to a method for preparing sodium carbonate from sodium sulfate. The method comprises, based on the original ammonia-soda process for sodium carbonate preparation, clarifying to remove impurities in an ammonia distillation mother liquor, stirring the ammonia distillation mother liquor at a temperature of 30-65 DEG C, according to calcium chloride content, adding sodium sulfate into the ammonia distillation mother liquor according to a mole ratio of calcium chloride to sodium sulfate of 1: 1-1.1, carrying out a reaction process to obtain sodium chloride and gypsum (CaSO4. 2H2O) precipitates, carrying out filtration to obtain unsaturated primary brine and carrying out later ammonia-soda process-based production. The method utilizes sodium sulfate as a raw material, utilizes chloride ions and ammonia as intermediate mediums, realizes resource cyclic utilization, reduces waste water generation and is very important. The method can reduce sodium carbonate production wastes, utilizes sodium sulfate or saltcake raw ore as production raw materials, reduces enterprise water consumption and waste water discharge, reduces solid waste production and improves enterprise economic benefits.

Description

Technical field [0001] The invention belongs to the soda industry. Aiming at the soda ash production process using sodium chloride as the raw material by the ammonia-soda method, in particular, it relates to the process of preparing soda ash with sodium sulfate as the main raw material instead of sodium chloride in the process of soda production. Background technique [0002] The existing ammonia-soda soda ash production process uses sodium chloride as the main raw material for sodium. The main process is shown in image 3 Sodium chloride and sodium sulfate are mostly associated salt mines. Sodium sulfate has been unable to be used in the existing ammonia-soda process. Sodium sulfate is treated as waste in soda enterprises, and sodium chloride is used as raw material for production. In the production process of the ammonia-soda method, a large amount of waste water, salt loss and environmental pollution are generated. Summary of the invention [0003] The invention provides a proc...

Claims

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Application Information

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IPC IPC(8): C01D7/00
CPCC01D7/00
Inventor 史永军张平安杨诺史秦博苑
Owner 史永军
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