Waste fly ash washing water recycling treatment process and equipment

Abstract

The invention discloses a waste fly ash washing water recycling treatment process which comprises the following steps: waste fly ash washing water preheating, evaporation and concentration, forced-circulation evaporation, concentrated solution circulation, sodium chloride crystallization, sodium salt-separating mother solution circulation and potassium chloride crystallization. Separation of sodium chloride and potassium chloride in the waste fly ash washing water is realized, the sodium chloride salt and potassium chloride salt are respectively obtained, production of solid wastes and hazardous wastes is reduced, the resource recovery effect is achieved, and the process is high in degree of automation, possible in continuous operation and high in production efficiency. In addition, a mechanical steam re-compression technique with energy conservation is used in the process, the energy consumption for evaporating one ton of water only accounts for 1 / 6-1 / 5 of that of a conventional evaporator, high thermal efficiency and low energy consumption can be achieved, pollutants can be reduced, and environment pollution can be avoided. The invention further discloses equipment of the process, dependency to boiler equipment can be reduced, environment pollution can be reduced, energy conservation and environment protection can be achieved, a high equipment automation degree can be achieved, and the process adopts equipment with continuous operation and production and is high in efficiency and low in operation cost.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a treatment process and equipment for cleaning waste water from garbage fly ash, in particular to a recycling treatment process and equipment for washing water from garbage fly ash. Background technique [0002] With the rapid development of the economy, the level of urbanization and the continuous improvement of people's living standards, the output of urban garbage is increasing day by day. The basic treatment methods of garbage include landfill, composting, and incineration, among which incineration can make the garbage harmless by high temperature sterilization. 90% volume reduction and 75% volume reduction. However, a large amount of fly ash will be produced during the waste incineration process. The waste incineration fly ash is hazardous waste and contains pollutants such as dioxins and heavy metals. How to safely and effectively dispose of waste fly ash has ...

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Problems solved by technology

[0003] At present, a better harmless disposal method is to use cement kiln to burn hazardous waste. The main components of garbage fly ash are calcium oxide, silicon oxide, aluminum oxide, etc., which can be used as raw materials for cement, but the fly ash contains Excessive chloride ion content (contains a large amount of sodium chloride and potassium chloride), high chlorine will cause damage to the cement kiln and affect the quality of cement

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