Method for stable volatilization of heavy metal chromium, cadmium and lead

A heavy metal and volatile technology, applied in the fields of lead, fixed volatile heavy metal chromium, and cadmium, can solve problems such as difficult industrialization, complex process of removing heavy metals, and reduction of solid waste burnout, achieving strong process operability, Achieve recycling and reduce costs

Inactive Publication Date: 2015-12-09
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods have the following disadvantages: (1) For the method of removing heavy metals by activated carbon adsorbent, a large amount of activated carbon is required in the solid waste incineration process, which makes the cost of activated carbon removal very expensive
In addition, how to dispose of activated carbon loaded with heavy metals is also a problem, especially the chlorinated heavy metals have high leaching ability, which is easy to pollute groundwater sources; Sorbents of the same magnitude as waste
This will not only reduce the burnout of solid waste, but also greatly complicate the process of heavy metal removal
More importantly, in the process of solid waste incineration, it is difficult to ensure that the adsorbent is fully mixed with the waste; (3) for the application of water washing and nanotechnology, it is still difficult to achieve large-scale industrialization
In conclusion, the existing targeted fixation technologies for volatile heavy metals chromium, cadmium, and lead still cannot meet the requirements of environmental protection

Method used

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  • Method for stable volatilization of heavy metal chromium, cadmium and lead

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for utilizing solid waste energy and fixing volatile heavy metals chromium, cadmium and lead, comprising the following steps:

[0027] S1: Use a shredder to crush solid waste into solid fuel with a particle size of less than 1mm. The solid waste includes municipal solid waste, sludge, medical waste, industrial combustible waste, waste biomass and combustible waste containing volatile heavy metals chromium, cadmium, lead and Cl elements.

[0028] S2: Carry out chemical looping combustion utilization on the pulverized solid waste, the chemical looping combustion temperature is 850°C-1000°C, the chemical looping combustion uses an oxygen carrier modified by an adsorbent, the oxygen carrier is iron ore, The iron ore is crushed first, and then iron ore particles with a particle size of 0.2 mm to 0.3 mm are obtained by screening. The adsorbent used was Ca(NO 3 ) 2 , the Ca(NO 3 ) 2 Dissolved in deionized water, followed by wet impregnation modification of iron o...

Embodiment 2

[0033] S1: Use a shredder to crush solid waste into solid fuel with a particle size of less than 1mm. The solid waste includes municipal solid waste, sludge, medical waste, industrial combustible waste, waste biomass and combustible waste containing volatile heavy metals chromium, cadmium, lead and Cl elements.

[0034] S2: Perform chemical looping combustion on the pulverized solid waste, the temperature of the chemical looping combustion is 800°C-900°C, the chemical looping combustion uses an oxygen carrier modified by an adsorbent, the oxygen carrier is copper ore, The copper ore is pulverized first, and then the copper ore particles with a particle size of 0.2 mm to 0.3 mm are obtained by sieving. The adsorbent used was Ca(HCO 3 ) 2 , the Ca(HCO 3 ) 2 Dissolved in deionized water, then wet-impregnated copper ore particles. During the wet impregnation modification process, the mass percentage of adsorbent can be controlled, so as to prepare oxygen carriers with differe...

Embodiment 3

[0037] S1: Same as Example 2.

[0038] S2: Perform chemical looping combustion on the pulverized solid waste, the temperature of the chemical looping combustion is 800°C-900°C, the chemical looping combustion uses an oxygen carrier modified by an adsorbent, the oxygen carrier is copper ore, The copper ore is pulverized first, and then the copper ore particles with a particle size of 0.2 mm to 0.3 mm are obtained by sieving. The adsorbent used was Ca(HCO 3 ) 2 , the Ca(HCO 3 ) 2 Dissolved in deionized water, then modified by ultrasonic wet impregnation of copper ore particles. The mass percentage of adsorbent can be controlled in the process of ultrasonic wet impregnation modification, so as to prepare oxygen carriers with different adsorbent contents. In the chemical chain combustion process of solid waste, the adsorbent is used to absorb and fix chlorine element, so as to realize the role of fixing volatile heavy metals chromium, cadmium and lead in the process of solid ...

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Abstract

The invention discloses a method for stable volatilization of heavy metal chromium, cadmium and lead, and belongs to the technical field of harmlessness of solid wastes. The method comprises the following steps: S1, pulverizing the solid wastes, wherein the solid wastes comprise heavy metal chromium, cadmium and lead as well as a chlorine element; S2, performing chemical looping combustion treatment on the pulverized solid wastes, wherein the chemical looping combustion temperature is 800-1000 DEG C, an adsorbent-modified oxygen carrier is adopted in the chemical looping combustion process, the particle diameter of the adsorbent-modified oxygen carrier is 0.2-0.3 mm, and the adsorbent comprises one or more of calcium oxide, calcium nitrate, calcium carbonate and calcium bicarbonate. Through the adoption of the method, the problem in discharging of volatile chlorides of heavy metal chromium, cadmium and lead in a solid waste source utilization process in the prior art is solved.

Description

technical field [0001] The invention belongs to the technical field of harmless solid waste, and in particular relates to a method for fixing volatile heavy metals chromium, cadmium and lead. Background technique [0002] With the development of society and the improvement of people's living standards, the solid waste generated by various industries is increasing day by day. In recent years, the incineration method has become one of the most widely used methods for disposing of solid waste. These solid wastes mainly include municipal solid waste, sludge, medical waste, industrial combustible waste and waste biomass. This type of solid waste will inevitably contain a certain amount of waste batteries and other electrical storage devices, which contain various heavy metal elements, including volatile heavy metals chromium, cadmium, and lead. [0003] During the incineration of solid waste, the volatile heavy metals chromium, cadmium, and lead are emitted to the surrounding e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G7/00
CPCY02E20/34
Inventor 赵海波王金星
Owner HUAZHONG UNIV OF SCI & TECH
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