Bentonite is a clay rock, also known as montmorillonite clay rock, normally containing a small amount of illite, kaolin, halloysite, chlorite, zeolite, quartz, feldspar, calcite and the like; hardness 1-2, density 2~ 3g / cm3. Exchangeable cations of the smectite type, content and layer charge size, bentonite can be divided sodium bentonite (alkaline soil), calcium bentonite (alkaline soil), natural bleaching earth (soil acidity or acidic clay), which calcium include calcium bentonite and sodium and calcium and magnesium group.
In this method, by increasing the activation temperature and pressure of water with a small amount of material and rinse several times to increase the slurry method, activated clay and decolor power quality, reduce production costs significantly.
One kind of semi-wet activated clay efficient production methods, which include: the amount of bentonite and inorganic acids mixed;
At a temperature and pressure of the activation mixture; use of a certain amount of water to flush the activated slurry PH = 4;
And into the cake filtration, drying, grinding and other processes, which was characterized in that: a, activation temperature and pressure is generally increased to 200 ~ 300 ℃, and 15 to 40 atmospheres;
Rinse water slurry shall be equally divided into a number of equal parts, in turn.
To meet the paper, plastics and rubber products industries have a higher fineness requirements for bentonite, it is necessary to increase the fineness of bentonite to improve the quality of the product. Ultrafine grinding process is grinding stripping, high pressure extrusion, jet milling method. Bentonite milling equipment usually used SCM series ultrafine grinding or MTW European version of the T-shaped milling machines.
Widely used in paint, paper, paint, rubber, plastics, fillers, cosmetics, chemicals and other industries.
The milling machine used in grinding and processing of metallurgy, building fillers, cosmetics, chemicals and other industries ……
It is predicted that the amount of bentonite mineral resources has more than eight billion tons in China, laying the foundation for resource development and research of new products, market development, improve the competitiveness of it. But the low level of development and utilization of bentonite, so the total lack of extraction of 1% of proven reserves. In the international market is a “Low high intake” situation, is a lower export products (ore, casting, drilling, low-grade activated clay, etc.), import advanced products (detergent softeners, high-grade organic soil, waterproof blanket, etc.). According to incomplete statistics, The current annual sales of bentonite is about 2.7 million tons, which is used foundry sand from 100 to 1.1 million tons, 70 tons for drilling mud, used in metallurgy pellets 450,000 tons for oil bleaching (active clay) 200,000 tons, for the other 20 to 30 tons. Industry is characterized by small-scale enterprises (annual tons of enterprises with more than a handful), low level of technology, because it is resource-based industry and competition is not very intense, production and sales and prices are rising year by year.
Main purpose of bentonite
Mainly used material