Gypsum is widely used in our life, it is involved in many fields such as medicine, construction, industry, traditional Chinese medicine, etc. In addition to natural gypsum, many chemical gypsums are also manufactured in our industrial production activities, which are usually called industrial by-product gypsum. Industrial by-product gypsum refers to the by-products or waste residue with calcium sulfate as the main component generated by chemical reaction in industrial production. At present, there are more than ten kinds of industrial by-product gypsum in our country according to the classification of output industries and varieties, among which desulfurization gypsum and phosphogypsum account for about 85% of the total amount of all industrial by-product gypsum. At present, China's industrial by-product gypsum is reused in all aspects of life, of which the most important application is in the production of common gypsum, high strength gypsum and gypsum-based self-leveling mortar, and then processed into gypsum board and cement and other building materials that are often used in our daily life. According to the data of Common Research Network, China's gypsum output reached 228.594 million tons in 2021, and the actual output value exceeded 10 billion yuan, and it is expected that China's gypsum demand will reach 246.822 million tons in 2022, and the market scale will be further expanded.
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