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A carbonization process for soda ash production

A process and technology of soda ash, which is applied in the field of carbonization process, can solve the problems of further improvement of product purity, low utilization rate of sodium chloride in production rate, high energy consumption, etc., achieve the increase of circulating ammonia and solution volume, reduce utilization rate and cost Increased effect

Active Publication Date: 2020-09-25
重庆湘渝盐化有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The selection of various process indicators in the carbonization process has a decisive impact on the product output, quality and material consumption. However, the existing carbonization process has disadvantages such as high energy consumption, low yield and sodium chloride utilization rate. , and the product purity needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] S1: Control the temperature of ammonia brine to 15°C to form NH 3 / NaCl is 1.1; then it is sent to the cleaning tower to flow from top to bottom, and flows out through the bottom of the tower to obtain the cleaning solution; the cleaning solution is heated to 30°C and then sent to the top of the alkali-making tower;

[0023] S2: The heavy alkali calcination furnace contains 40% CO 2 The middle-stage gas, through the middle-stage gas compressor, controls the pressure to 0.25MPa, and through the middle-stage gas cooler, controls the temperature to 42°C, and enters the tower from the middle of the alkali-making tower to participate in the carbonation reaction;

[0024] S3: The heavy alkali calcination furnace contains 92% CO 2 The lower stage gas is sent to the bottom of the soda making tower through the lower stage gas compressor to control the pressure to 0.30MPa and the lower stage gas cooler to control the temperature to 28°C, and continue to carbonize the cleaning li...

Embodiment 2

[0027] S1: Control the temperature of ammonia brine to 22°C to form NH 3 / NaCl is 1.3; then it is sent to the cleaning tower to flow from top to bottom, and flows out through the bottom of the tower to obtain the cleaning solution; the cleaning solution is heated to 36°C and then sent to the top of the soda making tower;

[0028] S2: The heavy alkali calcination furnace contains 45% CO 2 The middle-stage gas, through the middle-stage gas compressor, controls the pressure to 0.30MPa, and through the middle-stage gas cooler, controls the temperature to 47°C, and enters the tower from the middle of the alkali-making tower to participate in the carbonation reaction;

[0029] S3: The heavy alkali calcination furnace contains 97% CO 2 The gas in the lower stage is sent to the bottom of the alkali-making tower through the lower-stage gas compressor to control the pressure to 0.35MPa, and the lower-stage gas cooler to control the temperature to 32°C, and continue to carbonize the cle...

Embodiment 3

[0032] S1: Control the temperature of ammonia brine to 17°C to form NH 3 / NaCl is 1.1; then it is sent to the cleaning tower to flow from top to bottom, and flows out through the bottom of the tower to obtain the cleaning solution; the cleaning solution is heated to 32°C and then sent to the top of the soda making tower;

[0033] S2: The heavy alkali calcination furnace contains 42% CO 2 The middle-stage gas, through the middle-stage gas compressor, controls the pressure to 0.27MPa, and through the middle-stage gas cooler, controls the temperature to 44°C, and enters the tower from the middle of the alkali-making tower to participate in the carbonation reaction;

[0034] S3: The heavy alkali calcination furnace contains 94% CO 2 The gas in the lower stage is sent to the bottom of the soda making tower through the lower stage gas compressor to control the pressure to 0.32MPa, and the lower stage gas cooler to control the temperature to 29°C, and continue to carbonize the clean...

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Abstract

The invention provides a carbonizing process for sodium carbonate production. The carbonizing process includes following steps: controlling temperature of ammoniacal brine to 15-22 DEG C, and composing NH3 / NaCl to 1.1-1.3; sending to a cleaning tower for flowing from top to bottom, and allowing the ammoniacal brine to flow out from the bottom of the tower to obtain cleaning liquid; heating the cleaning liquid to 30-36 DEG C, and sending the cleaning liquid to the top of a sodium carbonate making tower; compressing middle-section gas from a sodium hydrogen carbonate calcining furnace and containing 40-45% of CO2 through a middle-section gas compressor, cooling through a middle-section gas cooler, sending the middle-section gas to the bottom of the sodium carbonate making tower, and continuing to carbonize the cleaning liquid; controlling temperature of the upper portion and the middle of the carbonizing tower to 45-60 DEG C and 65-70 DEG C in the process of reaction respectively; controlling cooling speed of the lower portion of the carbonizing tower at each stage, using a tower bottom extracting pipe to take out a produced sodium hydrogen carbonate suspension, and sending the suspension into a sodium carbonate concentration tank to complete the carbonizing process.

Description

technical field [0001] The invention relates to the technical field of soda ash production, in particular to a carbonization process for soda ash production. Background technique [0002] The appearance of soda ash is white powder or fine crystal, with astringent taste, relative density (25°C) 2.532, melting point 851°C, specific heat capacity 1.042J / (g·°C) (20°C), easily soluble in water. Soda ash is one of the most important chemical industry raw materials. It is widely used in glass, chemical industry (caustic soda, sodium nitrate, detergent, softening hard water), petrochemical, metallurgy and other industries. It is also used in papermaking, soap, textile, printing and dyeing, Leather, food, medicine, film, light industry and other industries. [0003] The production methods of soda ash mainly include Hou’s soda ash method and ammonia soda method. The biggest advantage of the former is that the utilization rate of table salt can be increased to more than 96%. The latt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D7/16
CPCC01D7/16C01P2006/80Y02P20/141
Inventor 聂义民袁如涛赵磊
Owner 重庆湘渝盐化有限责任公司