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Social Benefit of Self-leveling of Gypsum-based Thick Layer

The main raw materials of gypsum-based self-leveling are cementitious materials, aggregates, additives and so on. The cementitious material is mainly industrial by-product gypsum, and the aggregate used is about 40-120 mesh fine aggregate. Experiments show that the fine aggregate of 40-120 mesh has the advantages of good fluidity and strong particle suspension, which is conducive to the improvement of self-leveling fluidity and strength. In the selection of aggregate, it is preferred to use steel slag, steel mud, tailings slag and other solid wastes as self-leveling aggregates, turning waste into treasure, with high economic benefits and good environmental benefits.

With the development of industrial production, the amount of industrial waste is increasing. In particular, metallurgy, thermal power and other industrial emissions are the largest. The amount of industrial waste is large, the variety is large, the composition is complex, and the treatment is quite difficult. Today, only a limited number of industrial wastes are used, such as the United States, Sweden and other countries use steel slag, Japan, Denmark and other countries use fly ash and cinder. Other industrial wastes are still mainly piled up negatively, and some harmful industrial solid wastes are disposed of by landfill, incineration, chemical transformation, microbial treatment and other methods; some are put into the ocean. Passive storage of industrial waste not only takes up a lot of land, resulting in a waste of manpower and material resources, but also many industrial waste residues contain water-soluble substances that pollute the soil and water through leaching. Powdery industrial waste, flying with the wind, polluting the atmosphere, and some also emit stench and toxic gas. Some waste even silt the river, pollute the water system, affect biological growth, endanger human health.

Industrial solid waste contains a large number of recyclable resources, and the recycling of industrial solid waste has become an important way to effectively alleviate the contradiction of strategic resource shortage. For example, the recycling of valuable metal components contained in industrial solid wastes such as smelting slag and tailings can effectively make up for metal mineral resources and improve the protection of resources in our country. Therefore, in order to alleviate the shortage of resources in China and reduce the pressure of resources on economic development, China must further speed up the process of industrial solid waste recycling and vigorously develop circular economy.? On the other hand, the study of the resource utilization of industrial solid waste in China can effectively alleviate the pollution of the ecological environment in China.

In 2016, the output of desulfurization gypsum in China's electric power will reach 95 million tons, plus 0.14 billion tons of various chemical gypsum including phosphogypsum, which is three times that of the United States in 2016. In terms of comprehensive utilization, the comprehensive utilization rate of desulfurization gypsum in China in 2016 will be 70%, far lower than that of Japan's nearly 100, Germany's 85% and EU's 88%. Among them, the comprehensive utilization rate of desulfurization gypsum in China's coastal economically developed areas is relatively high, in Shanxi, Inner Mongolia, Shaanxi and other provinces rich in natural gypsum resources and the western economically underdeveloped areas, the comprehensive utilization rate is low. Gypsum-based self-leveling as an important product to replace cement and reduce carbon emissions in China, as the country vigorously promotes the comprehensive utilization of industrial solid waste, the use of desulfurization gypsum and other industrial by-product gypsum instead of natural gypsum, greatly reducing production costs, related technologies are more mature. If all desulfurization gypsum is used in the production of thick-layer self-leveling gypsum-based building materials, and applied to real estate floor heating backfill and other engineering fields, it will greatly reduce the amount of high-energy-consuming cement products and reduce the land occupation caused by storage. It is of great social significance for energy conservation and emission reduction, the development of circular economy, clean production, the realization of zero emission of waste residue from coal-fired power plants, and the construction of a resource-saving society.

New ground thick layer self-leveling is a domestic initiative, is currently the most suitable new commercial housing floor heating backfill materials, the market potential is huge. Because its main raw material (60% by weight) hemihydrate gypsum can be processed from desulfurization gypsum, it has become the largest consumption of desulfurization gypsum in all gypsum products in China's building materials market. FGD gypsum is processed to produce thick layer self-leveling mortar for real estate projects, which can be completely consumed. At the same time, it is of great significance for energy saving and emission reduction, and improving the added value of industrial by-products.

Thick layer self leveling is easy to transport and storage, can be mechanized construction, and water mixed with both liquidity, good leveling to ensure the self leveling. Because of its non-cracking, high flatness of traditional materials can not be compared to the advantages, at the same time, the traditional practice of backfilling and ground leveling two processes into one, reducing a process, reducing the construction cost.

It can be seen that the production of gypsum-based self-leveling products after deep processing of desulfurization gypsum has large profit margins and broad market prospects. It is a win-win cooperation plan for all parties. While promoting thick-layer self-leveling, efforts should be made to expand the market share of gypsum powder in other gypsum products such as gypsum board, gypsum block, gypsum paper fiberboard, plastered gypsum, caulking gypsum, filled gypsum and other gypsum products, and take more measures to maximize sales and profits. To sum up, if all the desulfurized gypsum produced by 22 coal-fired power plants of Datang Power is used to produce thick-layer self-leveling gypsum-based building materials and other gypsum-based building materials, and applied to real estate floor heating and backfilling and other engineering fields, it will greatly reduce the consumption of high-energy-consuming cement products and reduce the land occupation caused by storage, it has extremely important social and economic significance for energy conservation and emission reduction, the development of circular economy, clean production, the realization of zero emission of coal-fired power plant waste residue, and the construction of a resource-saving society. It is a meaningful thing that benefits the country and the people. It can be predicted that after the successful and full implementation of this project, it will become a change in the application field of desulfurization gypsum.