The Qinghai Provincial Department of Science and Technology recently organized an expert group to evaluate the major scientific and technological research tender project in Qinghai-the research on the process of magnesium sulfate pyrolysis to produce magnesium oxide. The results
The aim is to make the by-product magnesium waste liquid in the production of potash fertilizer in salt lakes realize the comprehensive utilization of resources again, and then build a salt lake resource circular economy system.
This project was jointly undertaken by Qinghai Salt Lake Industry Group Co., Ltd. and the Institute of Process Engineering of the Chinese Academy of Sciences. The project was established in 2007. During the three-year collaborative research period, the research team developed a two-stage process for magnesium sulfate pyrolysis to produce magnesium oxide, completed direct magnesium sulfate cracking temperature research, calcination furnace type and material selection research, and magnesium sulfate pyrolysis magnesium oxide purity. Research, etc.
This process is to obtain magnesium oxide and sulfur dioxide through the pyrolysis of magnesium sulfate. The sulfur dioxide is converted into sulfuric acid, and then the sulfuric acid reacts with magnesium chloride to produce magnesium sulfate. The magnesium sulfate is then recycled into the system. The new process has three major innovations. First, magnesium sulfate heptahydrate is used as a raw material, and natural gas and gas are used as reducing agents to reduce and decompose magnesium sulfate, reducing the pyrolysis temperature from 1150 ° C to 800 ° C, and the conversion rate reaching more than 99%. The purity of magnesium oxide is greater than 98%; the second is to prepare high-purity magnesium oxide by low temperature reduction-fluidized bed pyrolysis cleaning process, and the fluidized reduction pyrolysis reactor is designed to improve the heat transfer efficiency and reaction speed, and make the system Energy is recovered and overall energy consumption is reduced. Third, energy saving and environmental protection of the entire process and resource utilization of by-products are achieved.
According to reports, magnesium salt reserves in the salt lakes of the Qaidam Basin in Qinghai Province amount to billions of tons, and magnesium chloride reserves in the Chaerhan Salt Lake alone have 4.67 billion tons. In addition, salt lakes such as the Jinaier Salt Lake and Yiliping in East and West Taiwan also have abundant sulfuric acid Magnesium resources. Over the years, the Salt Lake Group and the various potassium fertilizer production enterprises in the entire Chaerhan Salt Lake have produced about 10 tons of magnesium chloride old brine for each ton of potassium chloride produced. Magnesium has become a ecological problem for salt lake resources. The expert group recommended that the project unit continue to improve the process parameters, promote the industrialization process and industrialization of the results, and then provide advanced technology for the construction of a circular economy in Qaidam.
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