The utilization of industrial gypsum cannot be ignored - titanium gypsum
Industrial by-product gypsum refers to the by-product or waste residue with calcium sulfate as the main component generated by a chemical reaction in industrial production, also known as chemical gypsum or industrial waste gypsum, mainly including desulfurization gypsum, phosphogypsum, citric acid gypsum, fluorine gypsum, salt Gypsum, of which desulfurization gypsum and phosphogypsum account for about 85% of the total industrial by-product gypsum.
Data from the Ministry of Industry and Information Technology shows that in 2013, the total discharge of industrial by-product gypsum, including desulfurized gypsum and phosphogypsum, was about 184 million tons, of which desulfurized gypsum and phosphogypsum accounted for about 85% of the total industrial by-product gypsum. %, about 70 million tons of phosphogypsum, about 75.5 million tons of desulfurized gypsum, and 38 million tons of other industrial by-products of gypsum. At present, the total amount of desulfurized gypsum produced by the thermal power industry, iron and steel industry, and phosphate fertilizer industry in my country is about 140 million tons each year. The titanium gypsum produced by the sulfuric acid method titanium dioxide is produced by the sulfuric acid method. When the titanium dioxide is produced by the sulfuric acid method, lime is added to treat the acid wastewater. (or calcium carbide slag) is an industrial waste residue with dihydrate gypsum as the main component produced by neutralizing a large amount of acidic wastewater, which is the main industrial by-product of titanium dioxide produced by the sulfuric acid method. It is reported that in 2011, the total output of titanium dioxide in my country was 1.812 million tons, most of which were produced by the sulfuric acid method. If every ton of titanium dioxide produced is about 4 tons of titanium gypsum as a by-product, the annual emission of titanium gypsum has reached more than 7 million tons. At the end of the "Twelfth Five-Year Plan" period, my country's titanium gypsum production will reach 20 million tons per year. . Compared with desulfurization gypsum, titanium gypsum has not attracted enough attention from society. At present, titanium gypsum is the industrial by-product gypsum with the lowest utilization rate. People usually pay more attention to desulfurization of gypsum and phosphogypsum, because after all, tens of millions of tons are produced every year, and they never thought that there would be such a large amount of titanium gypsum.
The massive discharge of titanium gypsum not only occupies a lot of lands, pollutes the environment, destroys the ecological balance but also brings a huge economic burden to titanium dioxide enterprises. At present, only a small amount of titanium gypsum is used for composite cementing materials and admixtures, and a large amount of titanium gypsum has not been effectively utilized. If it is discarded, it will be washed away by rainwater, and the soluble harmful substances will dissolve in water; after being exposed to the sun, the powder will be scattered in the atmosphere after being blown by the wind, which not only pollutes the environment but also threatens people's health.
It is understood that at present, only Henan Billions, Sichuan Lomon, Wuhan Fangyuan, and other enterprises are involved in the comprehensive utilization of titanium gypsum. From the perspective of the whole industry, it is only in its infancy.
It is reported that the application of titanium gypsum in the field of building materials has a relatively mature technical foundation and market prospects. It is one of the options for cement batching, and the application of titanium gypsum in cement is no problem. According to reports, titanium gypsum mainly plays the role of adjusting the setting time in the preparation process of cement, and can also appropriately increase the strength of cement, reduce concentration, and improve frost resistance and impermeability. Another use of titanium gypsum is plaster of construction. Nowadays, natural gypsum is rarely used for building materials, and more and more industrial by-product gypsum is used, but now more desulfurization gypsum is used, and titanium gypsum is still rare.
The China Titanium Dioxide Industry Association is actively cooperating with the relevant state departments and proposes to formulate a special plan for the comprehensive utilization of titanium gypsum, so as to obtain policy support and financial support for the comprehensive utilization of titanium gypsum. While accumulating data and clarifying the mechanism through basic research, the industry association actively participates in the relevant standardization construction process, and gradually establishes and improves the standard system of titanium dioxide, by-products, and downstream comprehensive utilization products; R&D and integration of cutting-edge technologies for comprehensive utilization of product resources.
It is reported that Shanghai Griffin Nanotechnology cooperates with Panzhihua Yatai Technology and Shanghai Zeshen Chemical Technology Co., Ltd., and is trying to introduce the "green cement" technology from the United States to comprehensively utilize titanium gypsum to produce excellent thermal insulation and sound absorption performance, high strength, and fire resistance. Good building product.
The international nanotechnology application area development focuses on the research and development of various types of thermal insulation, heat insulation, high-strength, breathable materials, as well as corrosion-resistant, wear-resistant, and other new high-tech materials in new high-tech building materials. The main raw materials are all disposed of by nano clean production technology, using less natural resources and energy, according to the characteristics of each region, a large number of industrial or urban solid wastes are used, and through harmless disposal and quality improvement, it has become a non-toxic, All kinds of building materials and consumables that are non-polluting, non-radioactive and conducive to environmental protection and human health. Due to its emphasis on ecology, environmental protection, and low carbon, this new type of material is also called "Green material". The concept of "green" is reflected in all aspects of raw material selection, production process, product application, and recycling.
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