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Carbon dioxide emitted by cement production accounts for 5% to 6% of the world's total emissions. The world consumes about 3 trillion kilograms of cement each year, and every 9 kilograms of cement produced emits a total of 9 kilograms of carbon dioxide. Emissions in the cement production process urgently need to be solved. solve. According to a report recently organized by the Physicists Organization Network, the research team of George Washington University in the United States uses a new type of solar thermal process to produce cement, which can completely eliminate carbon dioxide emissions, and it is estimated that its production costs are lower. Relevant China Science and Technology Network News: Carbon dioxide emitted by cement production accounts for 5% to 6% of the world's total emissions. The world consumes about 3 trillion kilograms of cement each year, and every 9 kilograms of cement produced will emit a total of 9 kilograms of carbon dioxide. Cement production process The issue of emissions in China needs to be solved. According to a report recently organized by the Physicists Organization Network, the research team of George Washington University in the United States uses a new type of solar thermal process to produce cement, which can completely eliminate carbon dioxide emissions, and it is estimated that its production costs are lower. The relevant research was published in the recent Chemical Communications of the Royal Society of Chemistry.
The researchers described the process as a solar thermal electrochemical (STEP) method of cement production. According to reports, during the production of cement, 60% to 70% of the CO2 emissions occur during the conversion of limestone to lime; the rest of the emissions come from the coal required to burn the decarbonization heating dryer chamber reactor.
The STEP method needs to solve two problems. One is to replace fossil fuels with solar thermal energy; the other is that solar thermal energy is not only directly used to melt limestone, but also provides heat to assist electrolytic limestone. The combination of limestone electrolysis to lime and some other carbon and oxygen atoms depends on the temperature of the reaction. When electrolysis is below 800 degrees Celsius, molten limestone forms lime, carbon, and oxygen; when electrolyzed above 800 degrees Celsius, the result is lime, carbon monoxide, and oxygen.
Professor Stewart Licht, a professor of chemistry at the school, said: “This study proposes a new low-energy synthetic lime without any carbon dioxide emissions. Because high-temperature electrolytic limestone does not produce carbon dioxide, it reduces greenhouse gas emissions; it only produces oxygen. And graphite (can easily be stored as solid carbon) or carbon monoxide as fuel. This completes a low-energy and high-yield process."
He said carbon monoxide by-products can be used in other industries, such as producing fuels, purifying nickel, or making plastics and other hydrocarbons. In addition, the main product, lime, does not react with other by-products, but forms a very easy-to-clear mud at the bottom of the container. And, compared with the existing cement industrialization process, the STEP method has a lower cost.
The researchers stated that the STEP method can also be applied to many aspects, such as purifying iron and aluminum, producing glass, paper, sugar, cleaning chimneys, softening water, removing phosphate from sewage, and agriculture. The challenge for the next step is to expand its commercialization process. (Hua Ling)
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