Method for decolorizing sulfuric acid by using hydrogen peroxide

Abstract

The invention relates to a method for decolorizing sulfuric acid by using hydrogen peroxide. The method includes the following steps of injecting a hydrogen peroxide solution to the sulfuric acid in a closed sulfuric acid decolorizing tank at a speed of 6-18L / min*t with a volume ratio of the sulfuric acid to the hydrogen peroxide solution being 100: (6-22); and simultaneously continuously stirring a mixture at a speed of 8-15 revolutions per minute to obtain the finished sulfuric acid. By means of the hydrogen peroxide solution, the method is strong in oxidizability, good in selectivity, simple in process, convenient, flexible and capable of decolorizing tawny or black brown sulfuric acid; under acidic conditions, reduzate of the hydrogen peroxide is water, other metal ions can not added to the sulfuric acid finished product, and the quality of the sulfuric acid finished product can not be changed; therefore, the problem that the chromaticity and the transparency of the sulfuric acid finished product prepared by gypsum flue gases can't reach the standard can be eliminated, the quality of gypsum flue gas acid can reach the standard of high-class products of industrial concentrated sulfuric acid, the market competitiveness of the gypsum acid is improved, and economic benefits of enterprises are increased.

Description

Technical field [0001] The invention relates to a method for decolorizing sulfuric acid using hydrogen peroxide. Background technique [0002] Sulfuric acid is commonly known as the mother of industry and has a wide range of uses. It is a basic chemical raw material needed in all industrial fields of the national economy. [0003] According to the prediction of the China Chemical and Mining Association, to manufacture sulfuric acid, China will need 17.2 million tons of sulfur in 2015 and 21 million tons in 2020. [0004] At present, the main raw materials used in the manufacture of sulfuric acid in my country are pyrite and associated sulfur, but the guaranteed period of the existing reserves of pyrite and associated sulfur in my country is only 16 years. It can be seen that pyrite and associated sulfur resources are quite scarce. [0005] my country is rich in gypsum resources, natural gypsum (mainly anhydrite CaSO 4 ) The reserves rank first in the world, and a large amount of indu...

AI Technical Summary

Problems solved by technology

It can be seen that the gas and coal tar produced by incomplete coal combustion will inevitably enter the kiln gas and be brought to the sulfuric acid production system, which will also cause the color and transparency of the sulfuric acid product to exceed the standard

[0009] Sulfuric acid finished products whose chroma and transparency cannot meet the standards cannot enter the ranks of the first-class product market

At present, the price of gypsum acid (sulfuric acid made from gypsum) with the same intrinsic quality is about 10% lower than that of other homogeneous acids, which directly affects the economic benefits of enterprises. Moreover, the problems of chroma and transparency seriously affect the price of gypsum acid. survival market

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