Process for producing anhydrous sodium sulfite using smelting smoke

A technology of anhydrous sodium sulfite and sodium sulfite, which is applied in the field of producing anhydrous sodium sulfite by using smelting flue gas, can solve the problems of high product cost and sulfur consumption, and achieve the effect of solving pollution and environmental protection production costs

Inactive Publication Date: 2005-03-02
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

But this method will consume the raw material sulfur, resulting in high product cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The liquid caustic soda is pumped to the alkali storage tank, flows through the alkali storage tank to the absorption circulation tank, and is diluted according to the ratio until the concentration of sodium hydroxide is 11%. Qualified liquid caustic soda is pumped into the partial liquid device at the top of the absorption tower. After the caustic soda is evenly distributed in the absorption tower, it contacts with the clean flue gas from the purification section in countercurrent for cyclic absorption. The temperature of the absorbed liquid is controlled by a plate heat exchanger. In order to reduce side reactions and damage to the absorption tower, the temperature is controlled at 55°C. When the pH value of the absorption liquid reaches 5.6, the absorption liquid is transported to the neutralization section, and after the temperature is raised by the preheater, it is mixed with the dilute alkali from the high level tank in the Neutralization is carried out in the flow...

example 2

[0032] name

[0033] The product quality has reached the national standard GB9005-88 superior product standard.

example 3

[0035] name

[0036] The product quality reaches the national standard GB9005-88 first-class product standard.

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PUM

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Abstract

The present invention relates to sodium hydroxide absorption process of utilizing sodium hydroxide in absorbing low density smelting fume to produce anhydrous sodium sulfite. The present invention features that in the absorption tower, fume containing SO2 after being purified is made to countercurrent contact with sodium hydroxide solution to absorb SO2 to pH 5-6, sodium hydroxide is added to regulate pH to 9-10, sodium sulfate solution is added to eliminate iron, and through further filtering in filtering machine, solid-liquid separation and concentration, coarse sodium sulfite product of 42-45 % concentration is obtained, and the anhydrous sodium sulfite product is produced through further hot air contact drying and dewatering. The present invention reduces environmental pollution while producing stable sodium sulfite product.

Description

technical field [0001] A method for producing anhydrous sodium sulfite by using smelting flue gas relates to a method for producing anhydrous sodium sulfite by using caustic soda absorption method and using caustic soda to absorb smelting system flue gas. Background technique [0002] During the smelting process, a large amount of SO containing 2 Smelting flue gas, SO 2 Flue gas pollutes the atmosphere, and eliminating flue gas pollution is a problem to be solved in the smelting process. At present, flue gas is usually used for sulfuric acid production after treatment, which has a long process and poor market benefits. Anhydrous sodium sulfite is an inorganic raw material commonly used in chemical industry. The traditional method of production is the soda ash method, and the technological process is: the SO produced by burning sulfur 2 Mix and absorb with the prepared soda ash in the absorption tower, the absorption liquid is evaporated and concentrated to obtain the cru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/14
Inventor 李海成许健何春文常全忠冯拥军唐照勇
Owner JINCHUAN GROUP LIMITED
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