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Process for preparing calcined soda by trona containing abundant sodium bicarbonate

A technology of sodium bicarbonate and trona, applied in the chemical industry, can solve the problems of many equipments, complicated process, increased capital investment and operating costs, etc.

Inactive Publication Date: 2004-08-25
INNER MONGOLIA YIKE SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this process is complex and requires a lot of equipment, which means that capital investment and operating costs need to be increased

Method used

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  • Process for preparing calcined soda by trona containing abundant sodium bicarbonate
  • Process for preparing calcined soda by trona containing abundant sodium bicarbonate
  • Process for preparing calcined soda by trona containing abundant sodium bicarbonate

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Embodiment 1

[0037] Taking the production of alkali mine in Wucheng, Henan Province as an example, miscellaneous water and supplementary water in the production process of soda ash are used as the solution, and the solution mining underground is rich in NaHCO 3 The temperature obtained from various sodium salts is 39°C, and the main material composition is: Na 2 CO 3 : 8.09wt%, NaHCO 3 : 5.81wt%, the total alkalinity is the aqueous solution of 11.76wt%. After the above solution is filtered to remove insoluble impurities, it is sent to a multi-effect evaporation crystallization tank. Under the conditions of a temperature of 115-65°C and a residence time of 2 hours in the evaporator, the evaporation, concentration, and sodium bicarbonate of the above solution are simultaneously completed. Partial stripping decomposition and precipitation of mixed crystals of sodium carbonate monohydrate and sodium sesquicarbonate. NaHCO 3 The decomposition rate is about 75% or more. After the mixed slur...

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Abstract

The process for producing anhydrous sodium carbonate by utilizing natural alkali richly containing sodium hydrogen carbonate includes the following steps: purifying alkali bittern, feeding it into evaporation crystallization tank, introducing steam to make evaporation, concentration, wet decomposition (stripping) and crystallization so as to make most of sodium hydrogen carbonate in the alkali bittern be decomposed and converted into sodium carbonate, finally, in the crystallizer separating the sodium carbonate in the form of crystal carbonate and concentrated crystal soda mixed crystal from mother liquor, and calcining the mixed crystal to obtain invented product heavy anhydrous sodium carbonate whose stacking density is greater than 0.9.

Description

Technical field: [0001] The invention discloses a new process for preparing soda ash from trona rich in sodium bicarbonate, which belongs to the field of chemical industry. Background technique: [0002] Trona is widely distributed in nature, and it is the production base product soda ash (Na 2 CO 3 ), baking soda (NaHCO 3 ), caustic soda (NaOH) and other ideal raw materials. Sodium carbonate is an unstable compound in the air, which can easily absorb carbon dioxide and moisture in the air, and turn into sodium bicarbonate or double salt containing sodium bicarbonate, so there is often sodium bicarbonate in trona ore. [0003] Trona is mainly used in the production of soda ash. There are many patents for the production of soda ash from trona. Numerous trona is produced the processing method of soda ash, distinguishes with the property of intermediate product, can be summarized into two classes: a class is the sodium carbonate monohydrate (Na 2 CO 3 h 2 (O) process; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/12
Inventor 李武丁喜梅李管社任保祥张永胜
Owner INNER MONGOLIA YIKE SCI & TECH
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