Method for discoloring sulfuric acid by using potassium permanganate

Abstract

The invention relates to a method for discoloring sulfuric acid by using potassium permanganate. The method comprises the following steps of: filling potassium permanganate saturated water solution at normal temperature into sulfuric acid in a closed sulfuric acid discoloring tank at a speed of 0.1-0.8L / min.t, wherein the volume ratio of sulfuric acid to potassium permanganate saturated water solution at normal temperature is 1000: (2-8); and continuously stirring at a speed of 8-15 turns per minute, and statically placing the discolored sulfuric acid discharged from the sulfuric acid discoloring tank at least 1 day to obtain the finished product sulfuric acid. The method for discoloring sulfuric acid by using potassium permanganate has the advantages that since the potassium permanganate solution is used, the oxidizability is strong, the selectivity is good, the process is simple, convenient and flexible and the tawny or black brown sulfuric acid can be discolored; and the problem that the color and the clarity of the finished product sulfuric acid which is produced by using gypsum flue gas cannot satisfy the standard can be solved, the quality of the sulfuric acid which is produced by using the gypsum flue gas can be enabled to satisfy the standard on industrial concentrated sulfuric acid high-class products, the market competitiveness of the sulfuric acid which is produced by using gypsum is improved and the economic benefits of enterprises are increased.

Description

Technical field [0001] The invention relates to a method for decolorizing sulfuric acid using potassium permanganate. 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's gypsum resources are very rich, natural gypsum (mainly anhydrite CaSO 4 ) The reserves rank first in the world, and a large amou...

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

Images