Technique for decarbonizing fly ash with high ignition loss

Abstract

The invention relates to a decarbonization technology of coal fly ash with over-standard loss on ignition, original ash of the coal fly ash is sent to an ash storage tank of a treatment plant by a bulk tank car and sent to an ore pulp pre-processor after the measurement, an automatic dosing machine also adds a dispersant and a compound flotation agent into the ore pulp pre-processor for carrying out mixing and stirring, the output of the ore pulp pre-processor after the treatment enters a coal ash special flotation column, carbon particles are separated from the fly ash by the floatation, the carbon particles and the fly ash which are respectively collected are respectively concentrated by a concentrator, filtered by a filter and dehydrated, thus becoming fine coal powder and the coal flay ash with the low loss on ignition. The decarbonization technology can fully utilize the coal fly ash stacked by a power plant, thus generating substantial economic benefits; the coal fly ash during the operation can achieve the zero emission, which can protect environment, increase efficiency and save investment.

Description

Technical field: [0001] The invention relates to a material treatment process, in particular to a decarbonization process of fly ash whose loss on ignition exceeds the standard. Background technique: [0002] In coal-fired boilers in thermal power plants, coal is burned to produce flue gas, which contains a large amount of soot. After the flue gas passes through the electrostatic precipitator, the gas and dust in it are separated, and the separated dust is fly ash. In the past, thermal power plants had to spend a lot of money on land acquisition and stacking of fly ash, and they had to pay a lot of transportation costs to transport the fly ash from electrostatic precipitator to the storage yard. In addition, fly ash contains a small amount of harmful substances such as sulfur and phosphorus, which cause great harm to the environment of the storage yard. It has always been a big problem encountered by countries in the world in the process of economic development. [0003] Si...

AI Technical Summary

Problems solved by technology

[0004] Good fly ash has a wide range of uses, but due to the influence of coal types and insufficient boiler combustion, etc., the loss on ignition of fly ash is often too large (exceeding the standard). In layman's terms, "excessive loss on ignition" means Carbon content in fly ash is too high

The fly ash with too much loss on ignition has basically no use value except for making bricks and can only be discarded

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