Waste incineration additive with function of capturing heavy metals and preparation method thereof

A technology of waste incineration and additives, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of ineffective removal of heavy metal secondary pollution and high operating costs, and achieve low-cost, low-cost, and simple production processes. Effect

Inactive Publication Date: 2012-08-15
SOUTHEAST UNIV
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Problems solved by technology

[0005]Technical problem: The existing heavy metal removal method has high operating costs, cannot effectively remove the low-to-medium volatile heavy metals in the flue gas or is prone to secondary pollution, etc. Problem, the present invention proposes a garbage incineration additive with the function of trapping heavy metals and its preparation method, the purpose is to provide a cheap garbage additive that can effectively control the discharge of heavy metals in the incineration process

Method used

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Embodiment Construction

[0018] Below in conjunction with example the present invention will be further described.

[0019] The zeolite powder and limestone powder passed through a 100-mesh sieve are uniformly mixed in a mass ratio of 70:30. Take a certain amount of mixed powder and place it in a beaker, add 1mol / L NaOH solution to keep the solid-liquid ratio at 1:50 g / ml. Place the beaker in a water bath at 80°C, stir for 10 hours, then filter, soak and filter with clean water, and repeat twice. Dry the filter residue at 105°C for 24 hours, grind it, and pass it through a 100-mesh sieve to obtain a waste incineration additive with the function of trapping heavy metals.

[0020] According to the characteristics of Chinese municipal solid waste components, the simulated waste is configured, and the specific components are shown in Table 1. Add heavy metal acetate to simulate heavy metals in garbage, and the added components are shown in Table 2.

[0021] Table 1 Composition of simulated garbage

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Abstract

The invention provides a waste incineration additive with the function of capturing heavy metals and a preparation method thereof. The additive adopts zeolite and limestone as raw materials, the zeolite and the limestone are mixed according to the weight ratio of (50:50)-(70:30), and a product is prepared by soaking in an alkali metal solution. The preparation method comprises the following stepsof: mixing zeolite powder and limestone powder according to the proportion, heating and soaking in a NaOH solution for 8-24 hours, washing, drying and breaking for completion. The prepared waste incineration additive has the advantages of simple preparation method, low cost of the raw materials, obvious effect on controlling the emission of the heavy metals, capability of reducing the leaching toxicity of the heavy metals of incineration bottom slag and the like.

Description

technical field [0001] The invention relates to the fields of garbage incineration technology and air pollutant control, in particular to a garbage incineration additive with the function of trapping heavy metals and a preparation method thereof. Background technique [0002] With the increase of waste production, the reduction of landfill sites and the improvement of landfill requirements, waste incineration has gradually become the mainstream way of waste disposal. Garbage incineration is a waste treatment technology with the advantages of reduction, harmlessness, and resource utilization, but it will inevitably produce secondary pollution. Heavy metal pollution is one of the hot issues, especially when garbage classification has not yet been promoted. of China. [0003] At present, waste incineration power plants at home and abroad mainly control heavy metal emissions from waste incineration by injecting activated carbon into the flue before the dust collector. At aroun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/32
Inventor 黄亚继王昕晔仲兆平牛淼淼孙宇贾纪强
Owner SOUTHEAST UNIV
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