“Last year, more than 7 million tons of titanium gypsum was produced in the country. According to the current development trend, this number will reach 20 million tons or more at the end of the 12th Five-year Plan.†May 16-18, 2012 in Qingdao, Shandong Province At the China Titanium Dioxide Manufacturing and Application Forum, the number of experts disclosed that many participants felt pressure. Deng Jie, deputy secretary-general of China National Coatings Industry Association Titanium Dioxide Branch, believes that the issue of reuse of titanium gypsum has become the key to the sustainable development of the titanium dioxide industry, and it is necessary to plan solutions as soon as possible.
Titanium gypsum is an industrial waste produced with dihydrate gypsum as the main component for the treatment of acidic waste water and the addition of lime (or carbide slag) to neutralize a large amount of acidic waste water when titanium dioxide is produced by the sulfuric acid method. Industrial by-products. Compared to desulfurized gypsum, titanium gypsum did not cause enough social attention. According to Zhao Jinping, executive vice general manager of the technical center of Beixin Group Building Materials Co., Ltd., titanium gypsum is the lowest by-product of industrial by-product gypsum, and people usually pay more attention to desulphurized gypsum and phosphogypsum, because after all, they produce tens of millions of tons each year. Did not think that titanium gypsum will have such a large amount.
According to Deng Jie, in 2011, the total production of titanium dioxide in China was 1.812 million tons, and most of it was produced by the sulfuric acid method. If about 4 tons of titanium gypsum is produced per ton of titanium dioxide, the annual emissions of titanium gypsum have reached more than 7 million tons. The titanium dioxide industry in China is in a period of rapid development. The total domestic titanium dioxide production capacity has reached 2.62 million tons/year, and the capacity under construction is 2 million tons/year. Together with the planned production capacity of various companies, it is expected to reach the end of the “Twelfth Five-Year Plan†period in China. Titanium dioxide production capacity will increase to 5 million tons/year. In this way, if the production capacity is completely transformed into production, the amount of titanium gypsum produced in China will reach 20 million tons/year at the end of the “Twelfth Five-year Plan†period.
"This is not a small figure." Deng Jie believes that the large amount of titanium gypsum emissions not only takes up a lot of land, pollutes the environment, destroys the ecological balance, but also brings a huge economic burden to the titanium dioxide enterprise. Currently, 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 used. If it is abandoned, it will be washed away by rainwater. Soluble harmful substances will dissolve in water. After sun exposure, the powder will be dispersed in the atmosphere after being blown by the wind, polluting the environment and threatening people's health.
It is understood that at present, only the Henan Li Li Lian, Sichuan Long Yao, Wuhan Fang Yuan and other companies involved in titanium gypsum comprehensive utilization projects. From the perspective of the entire industry, it is only at its infancy. According to Xia Changbin, deputy general manager of Wuhan Fangyuan Titanium Dioxide Co., Ltd., for domestic titanium dioxide enterprises, the massive waste of solid waste titanium gypsum produced by sewage treatment not only causes great environmental risks, but also wastes resources. In order to realize the comprehensive utilization of titanium gypsum, Wuhan Fangyuan has been exploring for many years. In 2011, through the joint cooperation of the scientific research resources of Qinghua Chemical and external scientific research institutes, the integrated utilization development project of titanium gypsum was incorporated into the national “863†plan and phased research results were achieved. The full realization of the effective recycling of titanium gypsum is expected to become a reality.
Deng Jie believes that the full development and utilization of titanium gypsum can not only improve the quality of gypsum products, reduce costs, but also in line with the national circular economy's industrial policies, produce good environmental benefits, and create considerable economic and social benefits. It is hoped that the government departments and the whole industry will actively promote the establishment of titanium dioxide production enterprises in supporting the establishment of a titanium gypsum reuse project in the production project.
According to the reporter's knowledge, titanium gypsum is used in the building materials field and has a relatively mature technology base and market prospects. Zhang Zengshou, director of the Beijing Jinsong Cement Concrete R&D Center, believes that the amount of titanium gypsum produced is large and stockpiles need to be concentrated and used in a large scale. It is one of the options for cement ingredients. The application of titanium gypsum in cement is no problem. . According to reports, titanium gypsum plays a major role in adjusting the setting time during the preparation of cement. It can also increase the strength of cement, reduce the concentration, and improve the resistance to freezing and corrosion.
Zhang Zengshou suggested that the backbone enterprises of titanium dioxide production should actively participate in the preparation of local resources comprehensive utilization planning in order to obtain support for funds and policies based on the resources and industrial characteristics of the region in which they are located; while accumulating data and clarifying the mechanism through basic research, , actively participate in the relevant standardization process, and gradually establish and improve the standard system of titanium dioxide, by-products, and downstream comprehensive utilization products; take the road of integration of production, research and development, and accelerate the research and development and integration of cutting-edge technologies for the comprehensive utilization of titanium dioxide by-product resources.
Another use of titanium gypsum is construction plaster. Nowadays there are few building materials made of natural gypsum, and more and more industrial byproducts of gypsum are used, but now more desulfurization gypsum is used, and titanium gypsum is still rare. According to Zhao Jinping, different types of gypsum, such as building gypsum, can be obtained by calcining titanium gypsum at different temperatures. After the building plaster is hardened, it has good thermal insulation and sound-absorbing properties, good fireproof performance and hygroscopicity. It can be used for the production of gypsum plasterboard, gypsum plaster and gypsum blocks and other gypsum building materials. A paper gypsum board production line with an annual output of 30 million square meters can consume about 660,000 tons of titanium gypsum per year.
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