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[Chemical Knowledge]：Properties and uses of ammonium alum

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Ammonium alum, also known as ammonium aluminum sulfate, is an inorganic salt that has important applications in the field of chemical production raw materials. It has unique chemical and physical properties, so it plays a key role in many industrial processes.

1. the nature of ammonium alum

1. chemical properties: ammonium alum is a double salt of aluminum sulfate and ammonium sulfate, with a high degree of stability, not easy to decompose. It is easily soluble in water, and the aqueous solution is acidic. Under high temperature conditions, ammonium alum can be decomposed into alumina, ammonium sulfate and other gases.
2. physical properties: ammonium alum is usually in the form of colorless or white crystalline powder, with high purity. It is tasteless, non-toxic and has good fluidity.

2. the use of ammonium alum

1. water treatment agent: ammonium alum as an effective water treatment agent, is widely used to purify a variety of water sources. In water, ammonium alum will be hydrolyzed to generate aluminum hydroxide colloid, which can adsorb suspended solids and colloidal substances in water, so as to achieve the purpose of purifying water.
2. Papermaking filler: In the papermaking process, ammonium alum can be added to the pulp as a filler to improve the uniformity and smoothness of the paper. In addition, it can also be used as a sizing agent for paper to increase the water resistance of paper.
3. Ceramic industry: In the ceramic industry, ammonium alum can be used as a flux to reduce the firing temperature of ceramics and improve product quality and output.
4. Pharmaceutical intermediates: Ammonium alum can be used as a pharmaceutical intermediate for the production of some drugs for the treatment of heart disease, hypertension and other diseases.
5. Food additives: In some foods, ammonium alum can be used as a food additive to improve the taste and appearance of food, as well as to extend the shelf life of food.

In general, ammonium alum has a wide range of applications in the field of chemical production raw materials, mainly due to its unique chemical and physical properties. However, in the process of using ammonium alum, we also need to pay attention to its possible environmental problems, such as excessive use may lead to water pollution. Therefore, in practical applications, we need to strictly control the amount and conditions of use of ammonium alum to ensure that it plays an important role without negatively affecting the environment and human health. At the same time, we also need to continuously research and develop new and more environmentally friendly alternatives to reduce the dependence on ammonium alum.

in the future of chemical production raw materials, ammonium alum will continue to play an important role. With the continuous progress and application of science and technology, we are expected to further optimize the production process and use methods of ammonium alum, improve its efficiency and safety, and make greater contributions to promoting the green development of the chemical industry.

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