(Baonghean.vn) - From November 2015 to present,Vicem Hoang Mai Cement Joint Stock Company has boldly used fly ash as an additive in cement production, both bringing economic efficiency and reducing environmental impact.
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| Panorama of Vicem Hoang Mai cement factory |
Mr. Nguyen Cong Hoa - Deputy General Director of Vicem Hoang Mai Cement Joint Stock Company said: Ash is the remaining product after burning coal to generate heat energy, recovered after dust filtration of thermal power plants. Ash and slag of thermal power plants are very good input materials for the production of construction materials, including fly ash which is an additive for cement production.
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| Fly ash tank system is pumped into the crusher |
Fly ash is a type of pozzolan including SiO2, Al2O3, Fe2O3,... which are round, superfine crystals, made up of silica particles, with an average particle size of 9 - 25μm. Fly ash added to cement has many specific effects: Reducing the water/cement ratio, thereby reducing concrete shrinkage; helping mortar and concrete adhere better to steel and improve surface finishing conditions; Increasing late age strength, reducing costs, increasing water resistance, Cl- corrosion resistance, increasing sulfate resistance; Increasing adhesion between concrete layers due to the effect of slowing down the setting of cement when using fly ash; Reducing heat loss during cement hydration, very effective when constructing large concrete blocks.
Fly ash is used as a cement additive to replace Clinker in cement from 3 to 7% depending on cement production technology, bringing high economic efficiency to the factory.
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| Workers operate the bottom valve of the fly ash tank into the pumping system. |
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| Fly ash from thermal power plants |
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| Crusher system |
According to Mr. Nguyen Cong Hoa - Deputy General Director of Vicem Hoang Mai Cement Joint Stock Company: Using fly ash reduces coal consumption, saves mineral resources for the country, and the cement products produced are more humane because this product itself is responsible for society and environmental protection.
Up to now, Vicem Hoang Mai Cement Joint Stock Company has produced 4,000 tons of cement per day, equivalent to 1.4 million tons of cement per year. The company uses 90,000 tons of fly ash per year purchased from PVOIL Thermal Power Plant (Ha Tinh). Since using fly ash to produce cement, the product has been assessed to be of higher quality and is more popular with customers.
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| All stages of cement production use fly ash |
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| Cement bagging operator |
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| Cement bagging line |
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| Cement on automatic conveyor |
To reduce environmental pollution, in recent years the factory has collected waste in the factory area to put into the furnace as fuel.
Van Truong
