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The new process was successfully developed by Chinese Remaining Aesthetics, a professor at Lai Sole University of Technology in China, and Nanchang New Chemical Technology Company. Raw gypsum includes natural gypsum, phosphogypsum, fluorogypsum, thiogypsum or other waste gypsum. Dr. Chong Li introduced that the new process they developed was to decompose gypsum at lower temperature and obtain sulfuric acid through absorption, which completely broke the traditional sulfuric acid production process, did not require vanadium catalyst and “two to two suction†processes, and the process was more simplified. No carbon dioxide is used as raw material, and there is no ammonium sulfate concentration and drying process. It has lower energy consumption, more investment, and lower production costs. Because vanadium-free catalytic conversion is not required, the use of gypsum-based acid is highly adaptable to gypsum, and there is no complicated pretreatment process. The waste residue produced after acid production can be reconstituted into a cement product and the waste can be fully utilized.
It is understood that there is a shortage of sulfur and pyrite resources in China, but there are abundant reserves of gypsum, in addition to a large number of waste phosphorous gypsum, sulfur gypsum, fluoride gypsum, salt gypsum and so on. In the phosphor chemical industry alone, 100 million tons of waste phosphorous gypsum is newly generated every year. In addition to the past accumulation, phosphogypsum takes up a large area of ​​land and pollutes the environment. Although there are many ways to use phosphogypsum to produce building materials, the total utilization rate is less than 10%. Large-scale and rational use of phosphogypsum is still a worldwide problem. The domestically developed phosphogypsum sulphuric acid and cement processes are often difficult to use because of complicated processes, long processes, large investment, high energy consumption, and high production costs.
Dr. Chong Chuang told reporters that after deducting all the production costs of the new process, tons of products can be profitable for more than 100 yuan, and the economic benefits are considerable.
According to Zhang Zhixin, chief engineer of Nanchang New Chemical Technology Company, who participated in the research, the new process technology has already applied for a national invention patent. It can help the phosphor chemical production process to really achieve dry pressing. If cement companies adopt this technology, they can use waste gypsum to replace limestone ore, add new sulfuric acid products, increase profitability, and eliminate carbon dioxide emissions from the decomposition of limestone. The process has also been lifted for hydrogen fluoride production plants, which can both eliminate sulfuric acid consumption and eliminate fluorinated gypsum emissions.
Gypsum Sulphuric Acid Green Process Investment Yields High
A brand new gypsum production process for the production of sulfuric acid co-production cement was successfully developed on March 5 in Nanchang, Jiangxi Province, and successfully passed the industrialization test to produce qualified sulfuric acid and cement products. This new process is more economical than the flue gas-to-sulfuric acid investment province. It saves half the investment in pyrite or sulfur-based sulfuric acid production, and has lower energy consumption and production costs. At the same time, it will break through the world of various waste gypsum such as phosphogypsum and turn it into treasure. problem. At present, the technology is preparing to accept the scientific and technological achievements appraisal of Jiangxi Science and Technology Department.