Methods of dealing with waste incineration fly ash
A waste incineration fly ash and slag technology, applied in the direction of improving process efficiency, can solve the problems of high cost, landfill occupation, resource waste, etc., and achieve the goals of reducing flux cost, effective treatment, huge economic and social benefits Effect
Active Publication Date: 2018-05-11
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
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[0053] Lead-containing raw materials are oxidized and smelted through an oxidation furnace (the furnace type can be a bottom-blown furnace, a top-blown furnace or a side-blown furnace). 2 The form of the flue gas containing high concentration SO2 is sent to the sulfuric acid system to make acid; most of Pb and Cu enter the crude lead, and a small part enters the oxidation slag and lead-containing fume, and the dust circulates in a closed circuit; Zn, Ca, Mg, Al, etc. enter Oxidize the slag, and then supply the oxidized slag, waste incineration fly ash and coal required for lead reduction and smelting to the reduction furnace for reduction and smelting treatment. The furnace type can be bottom blowing furnace, top blowing furnace Blowing furnace or side blowing furnace, the mass of waste incineration fly ash accounts for 1wt%-5wt% of the oxidation slag, the reduction temperature is controlled at 1200-1300°C, the dioxin in the fly ash is decomposed at high temperature, and crude ...
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The invention discloses a waste incineration fly ash treatment method. The waste incineration fly ash treatment method comprises the steps that firstly, raw materials containing lead are supplied into an oxidizing furnace for oxidizing smelting treatment so that smoke containing high-concentration SO2, lead bullion and oxidation furnace slag can be obtained; secondly, waste incineration fly ash and coal are mixed and granulated so that mixed granules can be obtained; thirdly, the oxidation furnace slag and the mixed granules are supplied to a reduction furnace for reduction smelting treatment so that lead bullion, furnace slag containing zinc and smoke containing low-concentration SO2 can be obtained; and fourthly, the furnace slag containing zinc is supplied to a fuming furnace for fuming treatment so that zinc oxide smoke dust and harmless furnace slag can be obtained. According to the waste incineration fly ash treatment method, by using the waste incineration fly ash as a flux in the reduction smelting process of the oxidation furnace slag, harmless and resourceful treatment of the waste incineration fly ash can be achieved, and meanwhile the lead metallurgy cost can be lowered.
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-...
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IPC IPC(8): C22B7/02C22B13/02
CPCC22B7/001C22B7/02C22B13/025Y02P10/20
Inventor 姚建明陈德喜刘海威胡立琼
Owner CHINA ENFI ENGINEERING CORPORATION