What is “white soil”?
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"\"Activated clay\" is something that laypeople may rarely come into contact with, or may not even have heard of. Natural clay, after being treated with acids, is known as acidic activated clay or reactive activated clay. Its main component is diatomite, which is already active on its own. What is the chemical composition of activated clay? SiO₂: (50–70) w% ； Al2O3:(10～16)w% ； Fe2O3: (2～4)w% ； MgO: (1～6)w%, etc. The chemical composition of activated clay varies greatly depending on the clay used as raw material and the activation conditions, but it is generally believed that there is little relationship between adsorption capacity and chemical composition. It is mainly used for the decolorization and purification of lubricating oils as well as animal and plant fats; for the decolorization or dehydration of petroleum fractions; and for the purification of solvents. It is typically employed in industrial decolorization processes and in the refining of petrochemical products. However, unscrupulous merchants use it in food processing, which is nothing short of murder.Clay is an active substance with strong adsorption properties. There have been instances of using clay to treat waste oils, which is a very dangerous practice that can cause serious harm to human health. According to my teacher, clay is also a highly smelly substance and represents a type of waste that is difficult to handle; usually, it is disposed of through landfilling. Please correct me if I’m wrong
We have used it for the decolorization of lubricating oils and paraffin.
White clay was previously used in the aromatic compounds workshop
May I ask, why isn’t it being used anymore? Are there any alternatives?
White clay, also known as kaolin or activated white clay. It can be used for the decolorization of oils and the absorption of moisture, and it can also be employed in the cable industry as a filler to increase resistance and reduce costs.
White clay is a grayish-white granular powder with a large specific surface area and pore volume; it possesses special adsorption capabilities and ion exchange properties, as well as strong decolorization abilities and activity, with good stability after decolorization. It is mainly used in the petroleum industry, and can adsorb unstable substances and colored substances such as unsaturated hydrocarbons, sulfides, resins, and asphaltenes found in petroleum-based minerals like paraffin and lubricating oils. Generally, bentonite usually refers to activated bentonite and acidic bentonite. Activated clay is an adsorbent made from clay (mainly bentonite) as raw material, through inorganic acid treatment, followed by water washing and drying. It appears as a milky white powder, is odorless, tasteless, and non-toxic, and possesses strong adsorption properties, enabling it to absorb colored substances and organic materials. It absorbs moisture easily in air, and its adsorption capacity decreases if left for too long. However, when heated to above 300 degrees Celsius, it begins to lose its crystalline water, causing changes in its structure and affecting the fading effect. Activated clay is insoluble in water, organic solvents, and various oils; it is almost completely soluble in hot caustic soda and acid salts. Its relative density is 2.3–2.5, and it swells very little in water and oil.
There is another product: granular bentonite. The acidic centers inherent in bentonite can be used to remove olefins.
It can be used for the decolorization of oils and to absorb moisture; our factory uses it in small amounts. . . . . . . . . . . . . . . . . .
By the way, in the old society, it was said that Guanyin soil was white – is it the same thing?
Study hard*, make progress every day: handshake
Decolorization should be done using chalk, while dehydration requires kaolin