Process for preparing high-quality heavy soda ash by using crude sodium bicarbonate

A technology of sodium bicarbonate and heavy soda ash, applied in carbonate preparations, alkali metal carbonates, alkali metal compounds, etc., can solve the problems of high consumption of brine, low total alkalinity of brine, and impact, etc. The effect of production cost, product quality improvement, and soda ash quality improvement

Active Publication Date: 2020-03-31
CHINA TIANCHEN ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For the high salinity brine whose main component is sodium chloride and the total alkalinity is low, the existing technology cannot be applied, and the existing problems mainly lie in: (1) the high salt concentration affects the crystallization of alkali monohydrate, and the higher purity cannot be obtained. (2) the total alkalinity of brine is low, the consumption of brine per ton of alkali is high, and the production cost is unacceptable

Method used

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  • Process for preparing high-quality heavy soda ash by using crude sodium bicarbonate
  • Process for preparing high-quality heavy soda ash by using crude sodium bicarbonate

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Effect test

Embodiment 1

[0037] Such as figure 1 As shown, a process for producing high-quality heavy soda ash by using crude sodium bicarbonate, high-saline-alkaline brine is obtained through the brine extracted from underground trona mines or directly drawn from the ground. The hypersaline brine 1 collected from the ground is composed of sodium chloride: 12.93wt%, total alkalinity 2.43wt%, sodium sulfate: 1.41wt%, potassium chloride: 0.43wt%.

[0038] (1) Evaporation and concentration of high-salinity brine: high-salt-alkaline brine 1 reaches the crystallization point of sodium chloride through evaporation and concentration, and obtains a concentrated product, that is, sodium chloride saturated solution 2, and water vapor 11 is also generated during the evaporation and concentration process;

[0039] (2) Sodium chloride crystallization separation: the saturated sodium chloride solution 2 is further evaporated, and sodium chloride crystals are separated out to obtain sodium chloride product 12 and al...

Embodiment 2

[0048] Such as figure 2 Shown, a kind of technique that utilizes thick sodium bicarbonate to produce high-quality heavy soda ash, concrete technological process is as follows: thick sodium bicarbonate is the thick sodium bicarbonate filter cake that obtains from certain trona production process, and its sodium chloride content is about 3300ppm, TOC content is about 2000ppm.

[0049] (1) Slurry stripping: mix the thick sodium bicarbonate 6 with water to obtain the sodium bicarbonate slurry 7, adjust the slurry to 25% solid content, and use steam to remove part of the sodium bicarbonate in the sodium bicarbonate slurry 7 in the stripping tower Decompose into sodium carbonate, carbon dioxide and water to obtain stripping complete liquid 8; use a stripping tower to decompose most of the sodium bicarbonate and carry out monohydrate alkali crystallization, the stripping temperature is 146 ° C, and the stripping pressure is 3.8 barg.

[0050] (2) Crystallization of sodium carbonate...

Embodiment 3

[0054] Such as figure 2 Shown, a kind of technology that utilizes crude sodium bicarbonate to produce high-quality heavy soda ash, concrete technological process is as follows: Crude sodium bicarbonate is the thick heavy alkali that ammonia soda factory obtains by carbonization and heavy alkali separation, and its typical composition is: bicarbonate Sodium: 76.04wt%, sodium carbonate: 6.68wt%, sodium chloride: 0.45wt%, ammonium bicarbonate: 3.09wt%, water: 13.74wt%.

[0055] (1) Slurry stripping: thick sodium bicarbonate 6 is mixed with water to obtain sodium bicarbonate slurry 7, and slurry is adjusted to a concentration of 25-35wt% sodium bicarbonate, and steam is used to remove sodium bicarbonate slurry 7 in the stripping tower. Part of the sodium bicarbonate is decomposed into sodium carbonate, carbon dioxide and water, and the stripping complete liquid 8 is obtained; most of the sodium bicarbonate is decomposed by a stripping tower, followed by monohydrate alkali crystal...

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Abstract

The invention provides a process for preparing high-quality heavy soda ash by using crude sodium bicarbonate, wherein the high-quality heavy soda ash with low impurity content is obtained by using crude sodium bicarbonate through slurry regulating and steam stripping, sodium carbonate monohydrate crystallization, sodium carbonate monohydrate separation and drying and other steps. According to theprocess for preparing high-quality heavy soda ash by using crude sodium bicarbonate, the production cost can be effectively reduced, and the product quality can be improved.

Description

technical field [0001] The invention belongs to the field of soda ash preparation, in particular to a process for preparing high-quality heavy soda ash by using crude sodium bicarbonate. Background technique [0002] The traditional process of producing heavy soda ash from sodium bicarbonate involves calcining sodium bicarbonate to obtain light soda ash, producing monohydrate alkali crystals through solid-phase or liquid-phase hydration, and obtaining heavy soda ash after drying. The process has hundreds of years of industrial experience, and there are still some areas to be improved: (1) the process is long and the equipment is complicated; (2) there are a large number of solid material conveying and processing equipment, and the production environment is relatively harsh; (3) a single The equipment capacity is limited and the number of equipment is large. [0003] In the United States and Botswana, there is a process for producing heavy soda ash from crude sodium bicarbon...

Claims

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Application Information

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IPC IPC(8): C01D7/12
CPCC01D7/126
Inventor 胡斌冯青天胡书亚张沫陈学峰李黎峰
Owner CHINA TIANCHEN ENG
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