Waste incineration fly ash melting recycling treatment method

Abstract

The invention discloses a waste incineration fly ash melting recycling treatment method, which comprises the steps of conveying waste incineration fly ash into an electrical heating melting furnace through a sealed pipe, meanwhile, adding a hardening and tempering modifying agent into the electrical heating melting furnace, melting the waste incineration fly ash and the hardening and tempering modifying agent through the electrical heating melting furnace, and obtaining high-temperature flue gas and high-temperature melt; blending the melted high-temperature flue gas with cold air for cooling, and washing the cooled dusty flue gas; carrying out dust mud dewatering on a substance obtained after washing, obtaining metal powder insoluble in water, and treating residual substances soluble in water into industrial salt crystal particles by adopting an MVR process; carrying out deep processing treatment on the high-temperature melt, and obtaining fireproofing fiber, thermal insulation materials or wear-resisting cast stones. According to the waste incineration fly ash melting recycling treatment method provided by the invention, the method has no need to consume a lot of water resources but only utilizes a process with low water consumption, so that the cost for extracting and purifying industrial salt is reduced; in addition, the extracted industrial salt has no risk of mixing with a heavy metal substance, and meets the requirement on producing multiple recycling products.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a melting and recycling treatment method of waste incineration fly ash. Background technique [0002] In 2015, the amount of garbage generated in my country reached 250 million tons, including about 190 million tons of domestic waste and about 60 million tons of industrial waste. Landfill and incineration are currently the two main methods to solve the siege of garbage in China. Landfill only adopts the method of centralized stacking for fixed storage. Incineration is an effective means to reduce the volume and weight of combustibles in garbage by burning them. With the decreasing amount of landfills planned in major cities in China, waste incineration, as a new technology that achieves efficient disposal in China in recent years, has developed rapidly. In 2015, the domestic waste incineration rate was about 30%, and it is planned to increase the domestic waste ...

AI Technical Summary

Problems solved by technology

The application number is 2016104163312, and the name is: A method of synergistically melting electroplating sludge and domestic waste incineration fly ash to prepare glass sand. This method requires incineration fly ash to be washed and pretreated before co-processing can be carried out. Consumes a large amount of water source, high cost, and there is a risk of waste water pollution. This method circulates the flue gas from the melting furnace to the fly ash washing liquid for aeration treatment to obtain industrial salt, due to the presence of various heavy metals in the electroplating sludge , certain heavy metal substances are inevitably mixed in the refined industrial salt, thus limiting the application of industrial salt; this method directly water-cools the slag into granular glass sand, and the subsequent use of glass sand requires energy-consuming processing again.

Images