A waste sulfuric acid recycling device and process

Abstract

The invention relates to a recovery and treatment method of waste sulfuric acid, comprising S1: performing defluorination pretreatment on waste sulfuric acid; S2: transferring waste sulfuric acid to a reaction kettle, adding magnesium oxide for reaction; S3: performing pressure filtration on the reaction solution, and transferring the waste residue to Waste residue storage tank, the filtrate is transferred to activated carbon filtration equipment; S4: The mother liquor of magnesium sulfate is separated from the first crystallization tank to detect the content of potassium bisulfate. According to whether the content of potassium bisulfate in the mother liquor reaches the predetermined threshold, it is decided whether the mother liquor should continue to circulate or recover sulfuric acid Potassium hydrogen is recycled. The method and device of the present invention can realize the recovery of potassium hydrogensulfate in waste sulfuric acid, and through the circular purification of the mother liquor, when the concentration of potassium hydrogensulfate in the mother liquor does not reach the threshold value, the mother liquor is returned to the reactor to continue to increase the potassium hydrogensulfate of the mother liquor Concentration, when the concentration of potassium bisulfate in the mother liquor reaches the threshold, the mother liquor is transferred to the crystallization tank, magnesium oxide is added to generate potassium magnesium sulfate and the material is separated and discharged, realizing the low-cost recovery of potassium bisulfate in waste sulfuric acid.

Description

technical field

[0001] The invention relates to the technical field of waste acid recovery, in particular to a waste sulfuric acid recovery treatment device and process. Background technique

[0002] The annual production of waste sulfuric acid in China exceeds 30 million tons. Most of the waste sulfuric acid contains organic matter and cannot be used directly. The existing technology for treating waste sulfuric acid from organic matter is mainly to crack and regenerate sulfuric acid for reuse. The investment in equipment is huge, and the cost per ton of waste sulfuric acid is extremely high. High production costs and huge losses have brought great pressure on the cost and environment of production enterprises, and are the biggest problems plaguing the production of enterprises. Others include extraction and other treatment processes, which involve the cost of extraction solvent recovery and low sulfuric acid content. Few enterprises apply them. Therefore, seeking economical...

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