Method for preparing glass sand by utilizing synergic fusion of electroplating sludge and household garbage incineration fly ash

Abstract

The invention relates to a method for preparing glass sand by utilizing synergic fusion of electroplating sludge and household garbage incineration fly ash. The method comprises the main following steps that 1, the household garbage incineration fly ash is washed according to the mass ratio of 1:8 for 2 times; 2, solid-liquid separation is performed through a filtration and dehydration device; 3, the washed fly ash is evenly stirred and mixed with the electroplating sludge; 4, the electroplating sludge and fly ash mixture is subjected to air-drying treatment or waste heat drying treatment; 5, the mixture is added to a fusion furnace, and a proper amount of auxiliary material (water glass) is added for high-temperature fusion; 6, the high-temperature molten mass is introduced to a water quenching tank containing circulating water, water quenching treatment is performed to obtain glass residues, and crushing treatment is performed; 7, incineration smoke is led to the fly ash washing solution for aeration treatment, and heavy-metal carbonate precipitate is produced, and can serve as industrial salt after filtration; 8, the supernate subjected to aeration treatment flows back to a fly ash washing device for reutilization; 9, a TCLP toxicity leaching test is conducted on the glass body.

Description

technical field [0001] The invention relates to a method for synergistically melting electroplating sludge and domestic waste incineration fly ash to prepare glass sand. Background technique [0002] A large amount of heavy metal electroplating wastewater generated in the electroplating industry is often treated by adding alkaline substances such as lime and sodium hydroxide to form heavy metal hydroxide precipitation. During this process, electroplating sludge containing a large amount of heavy metals is produced. Due to the different processes of electroplating manufacturers, the types and contents of heavy metals in electroplating sludge vary greatly, and there are also anions such as phosphate and sulfate. There are also a certain amount of organic components in some electroplating sludge, the main source of which is electroplating additives and organic flocculants added in the wastewater treatment process, which leads to the complexity of electroplating sludge componen...

AI Technical Summary

Problems solved by technology

Among them, washing and pickling not only produces a large amount of heavy metal wastewater, but the fly ash after washing still needs further disposal; solidification and stabilization use a large amount of cement, asphalt and other materials, which increases the storage capacity consumption of landfills; chelation stabilization costs are high, and the long-term stability It is debatable; during high-temperature sintering, additional viscous substances need to be added to granulate, and there is no relevant standard for sintered granules, so there are problems in whether it can be applied; high-temperature melting products have better stabilization effect on heavy metals, but the calorific value of fly ash is low and energy consumption is relatively high Big