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Method for treating waste incineration fly ash

A technology for waste incineration fly ash and raw materials, applied in chemical instruments and methods, improvement of process efficiency, removal of solid waste, etc. The effect of cost reduction, resource utilization and harmless treatment

Active Publication Date: 2016-10-26
CHINA ENFI ENGINEERING CORPORATION
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Problems solved by technology

[0004] The cost of chelating agent + cement solidification landfill is low, but there are problems such as landfill occupation and waste of resources; cement kiln co-processing needs to remove Cl in fly ash in advance to avoid affecting the quality of cement, so the cost is high, and there are The influence of heavy metals on cement quality; ash melting is more advanced, but the cost is relatively high

Method used

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  • Method for treating waste incineration fly ash
  • Method for treating waste incineration fly ash

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Embodiment

[0053] Waste incineration fly ash and lead-containing raw materials are mixed and granulated and then added to the oxidation furnace (the furnace type can be bottom-blown furnace, top-blown furnace or side-blown furnace). The quality of fly ash treatment accounts for 1%-5% of lead-containing raw materials Feed and smelting temperature is controlled at 1000-1100°C, dioxins in fly ash decompose at high temperature, and S is basically converted to SO 2 into the form containing high concentrations of SO 2 In the flue gas, it participates in acid production; most of Pb and Cu go into the crude lead melt, and a small part goes into the oxidation slag and lead-containing smoke, and the smoke and dust are closed-circuit circulation; Zn, Ca, Mg, Al, etc. enter the oxidation slag, and then oxidize the resulting The slag is supplied to the reduction furnace for reduction smelting treatment to obtain crude lead and zinc-containing slag, and then the obtained zinc-containing slag is suppli...

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Abstract

The invention discloses a method for treating waste incineration fly ash. The method comprises: (1), mixing waste incineration fly ash with a lead-containing raw material and pelletizing so as to obtain mixed aggregates; (2), supplying the mixed aggregates to an oxidizing furnace to carry out oxidizing smelting treatment so as to obtain smoke with a high SO2 concentration, coarse lead and oxidized slags; (3), supplying the oxidized slags to a reducing furnace to carry out reducing smelting treatment so as to obtain coarse lead and zinc-containing slags; and (4), supplying the zinc-containing slags to a fuming furnace to carry out fuming treatment so as to obtain zinc oxide smoke dust and harmless slags. According to the method, by using the waste incineration fly ash as a solvent in the smelting process of the lead-containing raw material, the harmless and resourceful treatment of the waste incineration fly ash can be realized, and at the same time, the lead smelting cost can be reduced.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular, the invention relates to a method for processing fly ash of garbage incineration. Background technique [0002] Municipal solid waste in developed countries in the world is mostly disposed of by incineration, while in China it is mainly disposed of by landfill. With the improvement of urban modernization, the "Twelfth Five-Year Plan for the Construction of National Municipal Solid Waste Harmless Treatment Facilities" proposes that by 2015, the capacity of national urban domestic waste incineration treatment facilities will reach more than 35% of the total capacity of harmless treatment , The waste-to-energy processing scale needs to increase from 89,600 tons per day at the end of 2010 to about 307,000 tons per day at the end of 2015, with a compound annual growth rate of 28%. China's municipal waste disposal is in a transition period from landfill-based to incineration-...

Claims

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Application Information

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IPC IPC(8): C22B13/02C22B9/10C22B7/02C22B7/00B09B3/00C01G9/03C01B17/50C01B17/74
CPCB09B3/00C01B17/50C01B17/74C01G9/03C22B7/00C22B7/02C22B9/10C22B13/02C22B13/025Y02P10/20
Inventor 姚建明陈德喜刘海威胡立琼
Owner CHINA ENFI ENGINEERING CORPORATION
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