Production process of large grain anhydrous sodium sulfate with natural salt lake mirabilite

Abstract

The production process of large grain anhydrous sodium sulfate with natural salt lake mirabilite includes the steps of washing mirabilite, decomposing mirabilite, refining, settlement, neutralizing with sulfuric acid to obtain clear solution, evaporating, centrifuging to dewater, and drying with hot blast to obtain product. It features the addition of surfactant solution comprising sodium dodecyl benzene sulfonate, sodium ethoxy alkyl sulfate and warm water at about 40deg.c into the clear solution before evaporating. The production process can produce anhydrous sodium sulfate of granularity of 200-1000 microns and with high economic value.

Description

1. Technical field [0001] The invention relates to a production method of anhydrous sodium sulfate, in particular to a method for producing large particle anhydrous sodium sulfate from natural salt lake mirabilite. 2. Background technology [0002] Anhydrous sodium sulfate, also known as Yuanmingfen, is a chemical raw material. At present, the method of producing anhydrous sodium sulfate by using natural salt lake mirabilite is: through the processes of washing nitrate, nitrate, refining, settling, adding acid, evaporating, centrifugal dehydration, and hot air drying to make a finished product. For example, the full-dissolution evaporation dehydration method pointed out in the book "Salt Chemical Technology" (the first edition of the first edition in December 1988, ISBN-5019-0516-9 / TS.355) published by Light Industry Press: from the salt lake The incoming Glauber's salt is separated from the large stones and mud at the feeding place and then enters the silo. After the mater...

AI Technical Summary

Problems solved by technology

At present, the method of producing anhydrous sodium sulfate from natural salt lake mirabilite cannot produce large particle anhydrous sodium sulfate, and cannot meet market demand