Method for processing industrial waste acid solution and preparing drying agent by using dolomite-containing attapulgite clay

Abstract

A method for treating industrial waste acid liquid containing dolomite attapulgite clay and preparing a desiccant, characterized in that the volume-to-mass ratio of waste acid liquid to dolomite attapulgite clay is 0.4 to 1 L / kg, adding Dolomite-containing attapulgite clay powder, the dolomite in the clay reacts with the waste acid solution, so that the pH of the mixture is greater than 3 after the reaction, and the water content of the mixture is controlled; the wet mixture containing water is formed and calcined to obtain attapulgite clay Composite desiccant; industrial waste acid liquid includes acid waste liquid produced from activated clay, acid waste liquid produced from attapulgite clay or bentonite and hydrochloric acid or sulfuric acid as raw materials to produce active silica, etc. The present invention not only treats and utilizes attapulgite clay or bentonite processing acid waste liquid, realizes zero discharge of waste water, but also saves raw materials such as calcium chloride and binder required for the preparation of common attapulgite clay desiccants, making the The production cost of the attapulgite clay composite desiccant is greatly reduced.

Description

technical field

[0001] The invention relates to a method for treating industrial waste acid liquid with attapulgite clay containing dolomite and preparing a desiccant. Background technique

[0002] Desiccant is an essential material for building insulating glass, food, medicine, textile and machinery industries to keep items dry and ensure product quality during product storage and transportation. It is also a material widely used in dehydration and drying of various industrial gases and liquids. At present, widely used desiccants include: compound desiccant such as anhydrous calcium chloride, lime desiccant, silica gel desiccant, clay desiccant (such as montmorillonite clay, attapulgite clay desiccant). Anhydrous calcium chloride desiccant will liquefy after absorbing water, and under certain circumstances, it will have a certain corrosive effect on the product. Silica gel and molecular sieve desiccants have good drying effects, but the cost is the highest among all kinds ...

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