The V. I. Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences (GEOKHI RAS), together with Chinese and Russian colleagues, has developed a new method for recycling waste from coal-fired power plants, the press service of the Ministry of Education and Science of the Russian Federation reported.
The new method involves sequential treatment of the non-magnetic fraction of ash with an alkaline solution, followed by hydrochloric acid. The resulting solutions can be used as a coagulant — polyaluminum chloride, which is used in water treatment.
First, the scientists dissolved 50% of the silica using alkali. Then, the ash was treated with hydrochloric acid at atmospheric and high pressure. This initiated the reaction of acicular mullite (a mixture of aluminum and silicon oxides). As a result, the degree of aluminum extraction exceeded 83%.
The resulting chemical reagent — polyaluminum oxychloride can be used in water treatment at the power plants themselves, as well as in the creation of thermotropic gels in the oil industry.
The experiments demonstrated the possibility of co-producing a number of other useful products — iron chloride, zeolites, and silicon oxide nanopowder. This opens up new prospects for the use of coal energy waste and reducing its negative impact on the environment.
Earlier, www1.ru reported that energy-saving technologies for coal-fired power plants were created in Moscow.
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