Activated clay is a clay (mainly bentonite) as raw material, the inorganic acid, followed by water rinsing, drying adsorbent made of, look for the milky white powder, odorless, tasteless, non-toxic, strong adsorption, can adsorb colored material, organic matter. Easy to absorb moisture in the air, place too long will reduce the adsorption properties. However, heated to 300 degrees Celsius above began to lose water of crystallization, is the change in structure, effects of fading effect. Activated clay is insoluble in water, organic solvents and oils, almost completely soluble in hot caustic soda and hydrochloric acid, the relative density of 2.3 ~ 2.5, in water and oil swelling minima. Widely used in mineral oil, animal and vegetable oil, wax and organic liquid decoloration refining. Can also be used as a moisture desiccant, internal medicine alkali antidote, vitamin A, B adsorption agent, lubricating oil contact contact agent, the gasoline vapor refining agent, can also be used as a temperature of polymerization catalyst, high temperature polymerization agent and manufacturing of particulate clay raw material.
Activated clay production method of bentonite as raw material of activated clay production bentonite as raw material are all wet, dry, semi wet, vapor phase method, calcination etc..
The conventional wet is bentonite, sulfuric acid, water after mixing in the case of mixing heated to 100 ℃ activation for a period of time after washing, drying, crushing to obtain the product. Disadvantages of this method is the largest consumption of acid, resulting in washing water consumption, serious environmental pollution, high cost. The following steps: processing; the original soil beating, purification and emission sand and water; adding acid and water, in the range of 80 ~ 100 ℃ activation of 10 – 30min, and at the same time, 1000r/min and stirring; filtering, filtrate recycling and refining purification step, the filter residue to the next step; drying, crushing; finished product testing, packaging. Dry the traditional production process is a small amount of sulfuric acid and water and bentonite mixture and stir well, for a period of time, then drying, grinding to obtain the product. Although this method reduces the consumption of acid, no waste water discharge, the pollution of the environment, but the quality of the products is low, which greatly limits its use. The following steps: processing; adding acid and water extrusion method at room temperature solid phase activation; drying and crushing; finished product testing, packaging. The production process and semi wet is a small amount of sulfuric acid and water and bentonite mixture and stir well, activated under certain temperature (placed) for a period of time, then adding acid and water and then a second step activation. The following steps: processing; adding acid and water at room temperature solid state extrusion method activation; adding acid and water activation; rinsing; filtering; drying, crushing; finished product testing, packaging. The production process and semi wet it can solve some problems of the wet and dry, simple process, low cost, high product quality.
Generally speaking, the production technology of semi wet than the traditional process of acid consumption reduced by half to 2/3 (1/2 ~ 2/3), water use reduced 1/2 ~ 2/3, less waste water, a treatment that is no environmental pollution, low cost, under the same conditions, the quality of the products. 30% than the traditional method of decoloring capacity. Vapor phase technique in pressure thermal vapor to water, acids, soil and dry mix granular mixture, between static by vapor phase, liquid phase, solid phase was acidified reacted furiously to form semi dry granular acidification, a kind of new technologies by rinsing processes for the preparation of active clay. The technology to technology as one of the advantages of the existing legal system of dry and wet clay and calcination method of activated white clay production technology, has a good practical value, provides a new technology for China clay production. The technology and traditional wet preparation of activated clay process compared with the following advantages:
The consumption of acid and water consumption were reduced by about 50%, the production period is shortened by 1/2 ~ 1/3; the light pollution, and easy to control; it covers an area of small, high utilization rate of equipment, less investment, quick effect and close connection with the existing wet process and equipment. According to different processes, activated clay can be aluminum, silicon and aluminum sulfate white sodium sulfate, gypsum etc..
Economic benefit analysis of bentonite raw material price is about 250 yuan / ton, ordinary activated clay the domestic market price of about 1200 yuan 1500/ tons.
According to the 10000 tons of activated clay size estimation, equipment and infrastructure investment of about 300 – 4000000 yuan, cost 600 to 700 yuan / ton, the annual output value of 14000000 yuan, profits and taxes 6000000 yuan. If the production of white carbon black, 4A molecular sieve higher benefits. Bentonite is our advantage in resources, reserves ranking first in the world, but the development and utilization of deep processing started late, backward technology, poor product quality, production scale is small, high-quality activated clay domestic oil bleaching and other departments use still need to be imported from abroad. USA activated clay production capacity has reached 4000000 tons / year or more, and our country is only 200000 tons per year. According to statistics, in recent years in China on activated clay demand at an annual increase rate of 7-8%. After investigation and analysis of the domestic market, only the oil refining market is huge, according to industry experts predict, China’s annual output of various vegetable oil is about 8000000 tons, imported oil 500 – 6000000 tons of refined oil, which accounted for 1/2, about 6500000 tons. Therefore, the production of activated clay and broad market prospect.