Garbage incineration fly ash filter cake modification method

A technology for waste incineration fly ash and filter cake, applied in cement production and other directions, can solve the problems of affecting the drying process of fly ash filter cake, high CaO content in fly ash, clogging inside the dryer, etc. Smooth, easy wall scraping effect

Inactive Publication Date: 2015-06-10
BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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Problems solved by technology

This method uses water washing technology to pretreat the fly ash, which effectively reduces the harmful components in the fly ash and greatly improves the ability of the cement kiln to co-process the fly ash. However, in actual engineering operation, due to the High CaO content, small particle size, and larg

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  • Garbage incineration fly ash filter cake modification method

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[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0019] like figure 1 Shown: the present invention includes a water washing treatment device combined with a water washing stirring tank and a vacuum filter set in three stages, wherein, the output end of the first water washing stirring tank 1 is connected with the first stage vacuum filter 2, and the first stage vacuum filter 2 is connected to the output end of the first stage vacuum filter 2. There are two output ports, one port is connected with the sewage tank 10, the other port is connected with the secondary water washing and stirring tank 3; the output end of the secondary water washing and stirring tank 3 is connected with the secondary vacuum filter 4, and the secondary vacuum The filter 4 is provided with 2 output ports, one end is connected with the 1# filtrate tank 9, and the other end is connected with the three-stage water washing and stirring t...

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Abstract

The invention discloses a garbage incineration fly ash filter cake modification method including: first, adding fly ash, sodium carbonate, coal ash and water into a first-stage water washing stirring tank for water washing for three times, using a vacuum filter for solid-liquid separation of filtrate and filter cake after each time of water washing; wherein filtrate separated by first time solid-liquid separation is sent into a sewage tank for subsequent wastewater treatment; the second time and third time solid-liquid separated filtrates are respectively used as the first time and second time water washing water; the third time water washing is clear water washing. The third time solid-liquid separated filter cake is a modified fly ash filter cake, due to the less looseness and smaller viscosity, the feed conveying is smooth, drying machine material attachment is reduced, the strength of material blocks formed during drying of the filter cake is small, wall scrapping is easy, and scattering is smooth, the fly ash filter cake drying process can be performed normally, the problems existed in the real engineering can be solved, and the cement kiln co processing garbage incineration fly ash technology can be improved.

Description

technical field [0001] The invention relates to the technical field of washing waste incineration fly ash, in particular to a method for modifying a filter cake of waste incineration fly ash. technical background [0002] In recent years, the waste incineration power generation projects that have emerged at home and abroad have contributed to the harmlessness, reduction, and resource utilization of municipal solid waste. However, waste incineration fly ash contains pollutants such as heavy metals and dioxins, which are highly concerned by environmental protection departments in various countries. In my country, the "National List of Hazardous Wastes" clearly stipulates that fly ash from domestic waste incineration is hazardous waste. Therefore, how to deal with waste incineration fly ash and develop treatment technology has become one of the research hotspots in the field of environmental protection in recent years. [0003] Since waste incineration fly ash contains a lot ...

Claims

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Application Information

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IPC IPC(8): C04B7/38C04B7/26
CPCY02P40/10
Inventor 朱延臣顾军王树吴学谦芦澍张国亮
Owner BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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