Treatment method of cyanide-containing waste polymer as alternative fuel in cement plant

Abstract

The invention discloses a processing method using a cyanide-containing waste polymer as a cement plant substitution fuel, the processing method includes the following steps: (1) the cyanide-containing waste polymer is detoxified and solidified; (2) an ingredient is added, the detoxified and solidified cyanide-containing waste polymer is stirred with the ingredient; and (3) the material prepared by the step (2) is used as the cement plant substitution fuel; detoxification and solidification is use of ferrous sulfate, sulfuric acid solution and ferric chloride for reacting with cyanogens in the polymer to produce an iron cyanide complex; the ingredient is an industrial waste with the water content below 5% and pH of 7-11; the amount of the ingredient can make the water content in the material not higher than 35%, the calorific value is higher than 2000 cal / g, and the pH is 7-9 as the standard. The processing method can effectively handle high concentration cyanide-containing waste polymer (cyanide content is 300-850 mg / kg), and reduces the cement plant pulverized coal fuel use amount so as to achieve the goal of energy conservation and environmental protection.

Description

technical field [0001] The invention relates to a treatment method for cyanide-containing waste, in particular to a treatment method for cyanide-containing waste polymer as an alternative fuel in a cement plant. Background technique [0002] In the prior art, cyanide-containing waste residues are mostly produced in electroplating, metallurgy, shipbuilding and other industries. The appearance is sludge-like or slag-like. It is mainly composed of inorganic substances and hardly contains organic substances. The cyanide content is 50mg / kg-300mg / kg. The main treatment process is sodium hypochlorite or calcium hypochlorite oxidation method, direct incineration or safe landfill after sealing. There are few relevant reports on the treatment methods for resource utilization of cyanide-containing waste residues. Among them, Sang Yimin et al. conducted laboratory experiments in the "Feasibility of Co-disposal of Cyanide-Containing Gold Tailings in Cement Kilns". Cyanide-containing gol...

AI Technical Summary

Problems solved by technology

There is still a certain amount of cyanide in the incineration residue produced by the direct incineration disposal method, and the residue needs to be safely landfilled, which may cause certain pollution to the atmosphere and occupy land resources; safe landfill after sealing will not only occupy land resources, but also Risk of water and soil contamination; detoxification using sodium hypochlorite or calcium hypochlorite oxidation is not possible due to high organic content in cyanide-containing waste polymers

There are hidden dangers of polluting the environment and endangering the safety of human life in the above-mentioned several methods of processing waste polymers containing cyanide.

In the prior art, there is no more effective and environmentally friendly treatment method for cyanide-containing waste polymers, and there is no report on the relevant treatment methods for resource utilization of cyanide-containing waste polymers.