Harmless regeneration recycling method of trash fly ash by using blast furnace

Abstract

The invention discloses a harmless regeneration recycling method of trash fly ash by using a blast furnace. The method has steps as follows: the blast furnace is used as processing equipment; trash fly ash is mixed into pulverized coal before the blast furnace injects coal, the mixture of pulverized coal and trash fly ash is delivered into the hearth of the blast furnace through the process of coal injection; or trash fly ash is mixed into the regenerative balls which are used by the blast furnace, and the regenerative balls mixing with trash fly ash are delivered into the blast furnace and used as common raw materials-pellet ore for ironmaking process in the blast furnace; the pellet ore is normally smelted, the high temperature and reducing atmosphere in the hearth area is used for processing and regenerating the fly ash. The invention can process mass trash fly ash, and does not need more special equipments. Not only the method can effectively process harmful material without new harmful products, but also calcium and other metal materials in the fly ash can be used for ironmaking process in the blast furnace, and then brought into pig iron or furnace cinder to be regenerated and utilized.

Description

technical field [0001] The invention belongs to the technology of garbage treatment, and in particular relates to the technology of treating garbage fly ash. Background technique [0002] Garbage fly ash is produced in waste incineration treatment. The main components of garbage fly ash are CaO, SiO2, Al2O3, SO3, etc., which contain high concentrations of heavy metals Pb, Cd, Hg, Cr, Cu, Zn, etc., and Dioxin, therefore, garbage fly ash is a substance that has entered the national catalog of dangerous substances, and must be effectively treated to prevent its pollution to the environment. At present, there are three relatively safe garbage fly ash treatment methods: 1. Cement coagulation and solidification treatment—landfill; 2. Chemical agent treatment—landfill; 3. Melting treatment—recycling. The melting treatment-recycling method is a more advanced treatment method. [0003] Melting treatment—recycling methods are divided into two categories: one is melting treatment in ...

AI Technical Summary

Problems solved by technology

[0004] However, for melting treatment in a high-temperature oxidizing atmosphere, research in the industry is either to design special equipment, or to use pelletizing shaft furnaces, sintering furnaces, steelmaking converters, etc. in ironmaking equipment. Requirements for the treatment of harmful substances such as dioxin, etc., but the high-temperature oxidizing atmosphere is used for melting treatment. When the melting temperature is above 800°C, all trivalent chromium in heavy metals will be converted into hexavalent chromium, and hexavalent chromium is swallowed. Sexual poison / inhalation extremely toxic, skin contact may cause sensitivity, more likely to cause genetic defects, inhalation may cause cancer, and has persistent danger to the environment, which are not allowed to exist in environmental protection standards at home and abroad

[0005] The high-temperature reducing atmosphere melting method can effectively avoid this problem, but the current high-temperature reducing atmosphere melting method at home and abroad all use special high-temperature reducing atmosphere melting equipment, such as surface melting furnaces, arc melting furnaces, plasma melting furnaces, Cyclone furnace, etc. The construction and operation costs of these equipment are extremely high, and it is difficult to implement industrialization

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