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Method for synthesizing hydrated calcium chloroaluminate from municipal refuse incineration fly ash

A technology of calcium chloroaluminate hydrate and incineration of fly ash, which is applied in the preparation of alkaline earth metal aluminate/alumina/aluminum hydroxide, can solve the problems of strict condition control, inconvenient large-scale production, and complex synthesis methods, etc. Achieve the effect of the potential of the large environment

Inactive Publication Date: 2009-09-02
SHANGHAI UNIV +1
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Problems solved by technology

However, the general synthesis method is relatively complicated, such as co-precipitation method, sol-gel method, ion exchange method, roasting pillar method, etc., but the general condition control is relatively strict or energy consumption is high, large-scale production is inconvenient or the cost is too high

Method used

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  • Method for synthesizing hydrated calcium chloroaluminate from municipal refuse incineration fly ash
  • Method for synthesizing hydrated calcium chloroaluminate from municipal refuse incineration fly ash

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Embodiment 1

[0025] The specific synthetic route is attached to the manual figure 2 shown. Take 70g of municipal waste incineration fly ash. The municipal waste incineration fly ash is rich in calcium and soluble chlorine and has high alkalinity. Mix and stir the municipal waste incineration fly ash and deionized water at a mass ratio of 1:20 After equilibrium, the pH range of the solution is 10.5-11.5, and the chlorine is 0.16-0.2mol / L; then take 30g of CA50 aluminate cement. Blend, grind and pass through an 80-mesh sieve. After grinding and mixing evenly, add 33ml of deionized water to stir well and mix well. After mixing, put it into a cement incubator and cultivate it under the conditions of 20°C and 97% humidity for 3 days, then dry and grind at 65°C. Microparticles mainly composed of calcium chloroaluminate hydrate are obtained, and the chemical formula of the compound is 3CaO·Al 2 o 3 ·CaCl 2 10H 2 O. Its XRD analysis pattern is as follows figure 1 .

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Abstract

The invention relates to a method for synthesizing hydrated calcium chloroaluminate, which belongs to the technical field of environmental engineering solid waste utilization. The method comprises the following steps: mixing and stirring municipal refuse incineration fly ash, aluminate cement and deionized water according to the weight ratio of 70:30:33; putting the mixture into a cement incubator for incubating for 72 hours under a condition that the humidity is between 95 and 99 percent; and drying and grinding the mixture to obtain micro-particles mainly comprising the hydrated calcium chloroaluminate. Through mixed hydration reactions between solid phases under the action of water, a compound with the characteristics of pollutant binding capacity, LDHs special structure, anion exchangeability, memory effect, and the like is synthesized. The method provides a new way for the treatment and the disposal of hazardous waste of fly ash, and achieves the effect of treating wastes by wastes simultaneously.

Description

technical field [0001] The invention relates to a method for synthesizing calcium chloroaluminate hydrate from urban waste incineration fly ash, and belongs to the technical field of environmental engineering solid waste utilization. Background technique [0002] Among the many factors affecting the urban ecosystem, urban waste is one of the most active disturbance factors. With the continuous acceleration of the urbanization process, the amount of urban waste in my country has increased sharply, and the growth momentum has not diminished. The treatment of urban waste has become increasingly more and more attention of the whole society. Because waste incineration technology can effectively destroy organic toxic substances, greatly reduce the volume of waste, and can recover energy, it will become an important research and development direction of waste resource, harmless and volume reduction treatment technology in my country. The removal effect of combustible substances is v...

Claims

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Application Information

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IPC IPC(8): C01F7/16
Inventor 任重王晓峰孙健华张文晓吴军新钱光人
Owner SHANGHAI UNIV
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