Treatment method of cyanogen-containing waste residue

Abstract

The invention discloses a treatment method of cyanogen-containing waste residue. The method comprises the steps of (1) adjusting alkali, wherein the pH value of the leachate of the waste residue after alkali is adjusted is 10-13; (2) breaking cyanogen, feeding a chlorine-containing cyanogen-breaking reagent into a stirring reaction kettle in a stirring state; (3) pelleting, feeding slaked lime powder and calcined gypsum powder into the material obtained after the cyanogen-breaking reaction in the step (2) in a stirring state, and mixing to enable the material in the stirring reaction kettle to form uniform spherical particles; and (4) drying and curing, naturally drying the particles in the stirring reaction kettle for 1-2 days after pelleting in the step (3), and curing. According to the method, cyanogen is broken by a chlorination process under the alkaline condition, so that the cyanide removal effect is good; after the oxidation reaction of the cyanide is finished, the salinity is cured in the particles instead of entering a waste water system; during stirring, two-section frequency is applied, so that the formed particles are even in sizes; during pelleting, gypsum is fed, so that the strength of the particles is greatly improved, and the construction in a landfill is more easily carried out.

Description

technical field [0001] The invention relates to dangerous goods treatment technology, in particular to a treatment method for cyanide-containing waste residue with high soluble salt content. Background technique [0002] The toxicity of cyanide to the human body is mainly due to its combination with ferric cytochrome oxidase to generate ferric cyanide cytochrome oxidase and lose the function of transferring oxygen, causing tissue hypoxia asphyxia. When the cyanide content in the water reaches 0.01 mg / L, it is not suitable for drinking water; when it reaches 0.03 mg / L, it has acute poisoning effect on fish. The maximum allowable concentration of cyanide in my country's surface water environmental quality standards is 0.1 mg / L. [0003] At present, there are many literature reports on the treatment of cyanide-containing wastewater. The widely used treatment methods for cyanide-containing wastewater include: chlorination method, air stripping method, sulfur dioxide-air oxidati...

AI Technical Summary

Problems solved by technology

For cyanide-containing waste residues with high soluble salt content, if the alkaline oxidation method is used, the method needs to adjust the pH twice, and the second time needs to add acid to adjust the pH to 8-9, and once the acid is added excessively or locally excessively to cause pH If it is less than 7, it will directly cause hydrogen cyanide gas to overflow, which will cause danger to operators. This method has high requirements for operation; in addition, it is difficult to mix chlorine gas with all cyanide ions into the waste residue, and it is easy to cause insufficient reaction. In addition, this method does not completely solve the problem of solidification of high-salt cyanide-containing waste residues, and high soluble salts exist in waste residues that have not been solidified; if the bleaching powder oxidation method is used, this method also has the problem that soluble salts have not been processed problem, unable to fundamentally solve the problem of stabilization and solidification of cyanide-containing waste residue with high soluble salt content