Method for conducting pre-treatment on waste incineration bottom ash aggregate by means of cement paste

Abstract

The invention discloses a method for conducting pre-treatment on waste incineration bottom ash aggregate by means of a cement paste. The method for conducting pre-treatment on the waste incineration bottom ash aggregate by means of the cement paste comprises the steps of firstly, carrying back waste incineration bottom ash from a waste incineration plant, removing debris in the bottom ash and particles attached onto surfaces of the bottom ash through washing, crushing massive waste incineration bottom ash by adopting a crusher, recovering metal in the bottom ash, then conducting aggregate grading on the crushed waste incineration bottom ash through a screening machine, immersing obtained aggregate in the cement paste with a water cement ratio of 0.4, after stirring is fully conducted, placing an obtained mixture on a vibration table for vibration, laying treated bottom ash in an iron pan flat, placing the iron pan in a drying box for drying, after drying is conducted, conducting waterspray treatment, and conducting drying continuously until the weight is constant to obtain treated waste incineration bottom ash aggregate. By means of the method, the strength of the waste incineration bottom ash aggregate is improved, a bonding effect with a cementing material also becomes better, the problem of a low utilization rate of waste incineration bottom ash aggregate is solved, and therisks of heavy metal leaching of the waste incineration bottom ash aggregate are reduced.

Description

technical field [0001] The invention relates to a treatment method for waste incineration bottom ash aggregate and preparation of recycled concrete, in particular to a method for pretreating waste incineration bottom ash aggregate with cement slurry. Background technique [0002] With the continuous improvement of living standards, the output of domestic waste in China is also growing rapidly. At present, the treatment methods of domestic waste in China are mainly landfill composting and incineration, but because waste incineration technology can greatly reduce the volume of waste, it is harmless The degree of incineration is high, and the heat energy generated by burning waste can also be used to generate electricity, which is in line with the principles of waste reduction, harmlessness, and resource utilization. Therefore, incineration technology will become an important research and development direction of waste treatment technology in China. It will inevitably lead to t...

AI Technical Summary

Problems solved by technology

The main disadvantages of heat treatment are high process energy consumption, high equipment cost, and heavy metals are easy to cause secondary pollution, etc.; the disadvantages of chemical agent method are mainly that the pH value of the agent itself is difficult to control, and the treatment of heavy metals by a single agent has limitations and cannot be coordinated. A variety of heavy metals; the disadvantages of separation and extraction technology mainly include high cost and high requirements for operating conditions and instruments

The aggregate obtained by condensation granulation technology requires a long time of curing process, and the time cost is extremely high

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