What is bleaching earth? What is granular bleaching earth made of?
This passage is going to talk about the followings of granular bleaching earth:
(1) Introduction to granular bleaching earth
(2) Natural bleaching earth
(3) Applications of granular bleaching earth
Bleaching earth, commonly referred to as fullerite, is a type of clay mined in Asia, Britain, India, and the United States.
Once this mineral-rich substance is obtained from the earth, it is processed and used for absorption, bleaching and filtration. After industrial use, the earth must be processed again and recycled for reuse or safe disposal. Scientists use beaker attapulgite, bentonite and montmorillonite clay are the most common substances in bleaching earth, alone or in combination.
In its original state, clay mainly contains silica, followed by aluminum. This clay usually also contains iron, magnesium and calcium. Clay deposits are similar to soil, ranging in color from pale yellow or brown to yellow or pure white. It is highly absorbent and usually has a smooth, greasy feel.
Acid clay is also known as natural bleaching earth, which is naturally produced clay with bleaching properties. It is a white and white gray clay with montmorillonite, albite and quartz as the main components. It is made of bentonite. One kind.
It is mainly the product of the decomposition of vitreous volcanic rock, which does not swell after absorbing water, and the pH of the suspension is weakly acidic. It is different from alkaline bentonite; its bleaching performance is worse than that of activated clay. The colors are generally light yellow, green-white, gray, olive, brown, milky white, pink, blue and so on. There are very few pure white ones. The density is 2.7-2.9g/cm. Apparent density is often low due to porosity. The chemical composition is similar to ordinary clay, the main chemical composition is aluminum oxide, silicon dioxide, water and a small amount of iron, magnesium, calcium and so on. No plasticity, high adsorption. Because it contains a lot of water-containing silicic acid, it is acidic to litmus. The water is easy to crack and has a large water content. Generally, the finer the finer, the higher the decolorizing power.
This clay is named "Bleaching earth" because it can remove pigments from oils and other chemicals.
Although it can be used in its natural state, manufacturing plants usually wash and heat the bleaching earth to reduce moisture content and eliminate microorganisms. The soil is then dried, and the processing plant crushes the finished product into small particles. The activated bleaching earth is mixed with hydrochloric acid, sulfuric acid or other acids in the form of a slurry. As a result, the clay is thoroughly washed, dried and ground. The manufacturer sells the finished products in grades, and their moisture content and particle size are different. The moisture content is between 6% and 12%, and the particle size ranges from 25 microns to larger particles, which are the same as those commonly found in cat litter.
It can also remove the colors normally associated with carotenoids, chlorophyll and chlorophyll.
Bleaching clay can also absorb unpleasant odors, including ammonia, sulfur, and tar. Manufacturers often use this compound to filter impurities in petroleum products, from food-grade petroleum to jet fuel. These clays are combined with brine and are often used as lubricants for drilling oils.
Some manufacturers also use clay as an ingredient in beauty products. Attapulgite is an ingredient in some antidiarrheals. The water absorption of clay makes it retain some oil or chemicals when used as a filter. These substances may be flammable. Or harmful characteristics, handling is a potential safety hazard. The processing plant mixes this material called waste bleaching earth with a solvent, cleans the clay with steam, combines the earth with acid, and then further washes, dries and grinds the soil.
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