Three Methods in current implementation of the stabilization process

1、Cement curing technology: cement curing is fly ash, cement by mixing an appropriate amount of water to make a method of curing, the curing mechanism is in the process of hydration of cement, by adsorption, chemical absorption, sedimentation, ion exchange, passivation and other means, the ultimate form of heavy metal hydroxides or hydrated silicate complexes remain in the surface of the cement cures to form CSH gel, while cement is added also provides an alkaline environment of heavy metals, inhibiting heavy metals in the fly ash leachate. Fly ash cement solidification technology is a relatively mature hazardous waste treatment technology has obvious advantages in terms of economics and operational, but the amount of cement is high, resulting in high capacity increase solidified over time, solidified part of the gradual dissolution of toxic substances may be long-term, the existence of a potential threat to the environment.
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2、Melting and solidification technology: the melting and solidification technology mainly to small mixing fly ash and glassy, after mixing granulation molding, melting at 1000-1400 ℃ high temperature, usually around 30min (melting time depending on the nature of the fly ash may be) , fly ash upon the physical and chemical state changes, cooling cured to form a cured body of glass, with a dense crystalline structure of the vitreous, to ensure stability of heavy metals. Melting and solidification technology for residue volume reduction rate, curing effect is good Sicoma Twin Shaft Concrete Mixer, but the fatal flaw is part of the toxic substances will evaporate, exhaust gas treatment measures must be taken. Therefore, the more complex the system, high operating costs.
3、Chemical stabilization techniques: chemical stabilization technology is the use of chemical agents, toxic and hazardous substances by chemical reaction into a low solubility, low migration and low process toxic substances. The stabilizer is commonly used inorganic and organic. Inorganic mainly Na2, S and phosphoric agent, an organic chelating agent primarily polymer material, fly ash insoluble drug is mixed with the complexing group, ash soluble metal (Cd, Pb, etc.) with complexing agents in the radical reaction, the formation of stable complexes, thereby fixing the fly ash, fly ash in order to reduce the possibility of leaching of harmful ingredients. Treatment with these agents ash, generally can achieve good results concrete batching mixing plant price, this method has a simple process, less investment in equipment, etc. portable cement mixers, but will produce high concentrations of inorganic waste, the need for further processing.

In summary, the use of cement solidification and stabilization combined process chemical treatment, incineration ash is an effective way to present the best practicable, on the basis of the company after years of painstaking experiments and practice, successfully developed the following process technology solutions, products made ??leachate tests are in line with the national emission standards.