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Method for smelting and separating refuse-combustion fly-ash heavy metal

A waste incineration fly ash separation treatment technology, applied in the direction of sustainable waste treatment, solid waste management, process efficiency improvement, etc., can solve the problems of expensive stabilizer, high processing cost, complex process, etc. Pollution, heavy metal stabilization effect

Inactive Publication Date: 2007-11-21
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

1. Stabilizers are expensive
2. High processing costs
3. The process is complex and immature

Method used

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  • Method for smelting and separating refuse-combustion fly-ash heavy metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] The method for melting and separating the waste incineration fly ash has the following steps:

[0012] 1) Add 3% hydrated lime, 2.5% industrial syrup and 5% water to waste incineration fly ash (5%, 8% or 10% hydrated lime, 1.5%, 3% or 5% industrial syrup and 5% , 6% or 7% water) use a disc pelletizer to make pellets, and maintain and form pellets;

[0013] 2) Put the fly ash pellets into the melting and separation furnace, the furnace temperature is 1400-1480°C, and the melting time is 10-30min, so that the heavy metals in the fly ash are deposited into the molten iron pool to form iron alloys, and the remaining heavy metals that cannot be deposited are solidified in the in the slag;

[0014] 3) The separated fly slag is used as building material raw material.

[0015] 2. Test results

[0016] After melting and cooling, the heavy metal content in the slag was measured by X-ray fluorescence analyzer, and the composition content (Wt%) of the f...

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Abstract

Treatment for smelting and separating fly-ash heavy metal from firing refuse is carried out by adding 3-10 wt% lime hydrate, 1-5 wt% treacle and 5-7 wt% water into fired fly-ash, granulating by disk granulator, retaining to form into pellet, adding fly-ash pellet into smelt separating furnace at 1400-1480 degree for 10-30 mins, depositing heavy metal in fly-ash into iron-water smelt tank to form into iron alloy and curing heavy metals into cinders. The separated fly cinders can be used as building raw materials. It has no secondary pollution.

Description

technical field [0001] The invention relates to a treatment technology for fly ash produced by garbage incineration, in particular to a method for melting and separating heavy metals from garbage incineration fly ash. Background technique [0002] Garbage incineration will produce a large amount of fly ash, which contains a large amount of heavy metals. If it is not handled properly, heavy metals may enter the water body and cause secondary pollution. The current fly ash treatment technologies are as follows, and the advantages and disadvantages of various treatment methods are compared as shown in Table 1: [0003] deal with technology advantage shortcoming cement to solidify 1. Cement has a wide range of sources and is cheap. 2. The processing technology and operation are simple 3. Low processing cost 4. The solidification effect of heavy metals in fly ash is good, and It can p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/14B09B3/00C04B18/14
CPCY02P10/20Y02W30/91
Inventor 刘清才杜云贵刘艺杨剑董凌燕郑永刚鹿存房
Owner CHONGQING UNIV
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