Tech for making tuff filter aid

Abstract

The production process of tuff filter aid includes the following steps: using light porous tuff as raw material, crushing it, grain size is less than 30 cm, drying at 100-300 deg.c to make the water content of said material less than 30%, fine crushing, further breaking said material, grain size (95% of material) is less than 43 micrometers, cleaning, removing grass root, sand and fine clay, the grain size of 90% of cleaned and separated material is less than 43 micrometers, adding water and stirring, bowl-filling, placing in tunnel kiln, bulking and roasting for 1-2 h. at 700-1000 deg.C, taking the material from bowl, further pulverizing and the grain size of 90% of material is less than 43 micrometers, sorting, removing superlarge granules (greater than 74 micrometers) and superfine granules (less than 2 micrometers), blending and mixing so as to obtain the invented product with low cost, stable quality and good filtering effect.

Description

technical field [0001] The invention relates to a preparation method of a tuff filter aid used to help the liquid to be filtered increase the filtration rate and improve the clarity, and is widely used in industrial sectors such as wine, food, chemical industry, oil refining, medicine, environmental protection, and sewage treatment. Background technique [0002] Many substances can be used as filter aids after processing, such as diatomaceous earth, perlite, cellulose, asbestos fiber, carbon powder, activated carbon, filter cotton, fine silica gel, fine sand and powdered ion exchange resin, etc. Among them, diatomite and perlite filter aids are the most widely used and used in the largest amount, and are common general-purpose filter aids; cellulose, asbestos, activated carbon, etc. also have their special properties, and are common auxiliary filter aids. [0003] In recent years, the consumption of diatomite filter aid has always accounted for ...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a preparation method of tuff filter aid, which uses light porous tuff as raw material, the production process is simple, and the cost is low, so as to solve the shortage of raw materials, complex production process and high price of diatomite filter aid. , chemical stability is not ideal enough, and at the same time solve the problems of perlite filter aids such as lack of intragranular pores, poor compression resistance, poor filtration and clarification effect, single product variety, and narrow application range