Fly ash synthesized cement and production method thereof

Abstract

The invention discloses a fly ash synthesized cement and a production method thereof. The cement is composed of the following components in percentage by weight: 50% to 90% of fly ash with a carbon content more than 5%, 5 to 40% of calcareous raw material, 1.5 to 10% of initiator, 1.5 to 10% of promoter, and 2 to 10% of corrector. The fly ash synthesized cement has the following advantages: (1) the discharge of sulfur dioxide is zero during the whole production process; (2) the production cost is reduced; (3) the cement strength is improved; (4) the residual carbon and combustible components in the raw materials can be burned; (5) the fuel cost can be saved, and the technology process is enhanced; (6) the residual carbon is taken as the fuel, thus the energy is saved, the cost is reduced, the environmental pollution is reduced, and the environment is protected; (7) the goals of decarbonization and dehydration can be achieved by burning, and moreover the adaptability of the production equipment on raw materials is improved; (8) in the milling procedure, the technology and equipment are identical with the present conventional cement clinker miller, and thus the modification and application of the technology and equipment are easy for the cement entrepreneurs; and (9) the sources of the raw materials and auxiliary materials are wide, the supply is sufficient in the market, and the selected equipment is matured and reliable and has strong universality.

Description

technical field [0001] The invention relates to a fly ash synthetic cement and a production method. Background technique [0002] Fly ash raw ash is a kind of industrial solid waste, which is the main solid waste discharged from coal-fired power plants or power boilers, and is the fine ash collected from the flue gas after pulverized coal combustion. my country's historical reserves of fly ash amounted to 12 billion tons. Calculated according to the national average ash discharge level, every increase of 10MW installed capacity will increase the discharge of nearly 10,000 tons of fly ash every year. Due to the incomplete combustion of coal, the loss on ignition of a large amount of fly ash exceeds the standard (some loss on ignition is as high as 15%), which cannot be directly used in building materials, construction and other fields, and is directly discharged into ash storage yards or into rivers and lakes. In the sea, a large amount of discarded "high-carbon wet dischar...

AI Technical Summary

Problems solved by technology

However, the basic idea is hydration synthesis and then firing at low temperature. There are problems such as large investment, long process, high cost, low amount of solid waste treatment, and consumption of external fuels. As a result, fly ash synthetic cement lacks market competitiveness.

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