Treatment method of waste residue containing cyanide

Abstract

The invention discloses a treatment method for cyanide-containing waste residue, which comprises the following steps: ① alkali adjustment, the pH value of the leaching solution of the waste residue after alkali adjustment is 10-13; Chlorine cyanogen breaking agent; ③ Granulation, adding slaked lime powder and plaster powder to the material after the cyanogen breaking reaction in step ② under stirring, and stirring the material in the reactor to form uniform spherical particles after stirring. ④Dry and solidify. After the granulation in step ③ is completed, stir the granules in the reactor for 1 to 2 days to dry and solidify naturally. The present invention chooses to use the chlorination method to break cyanide under alkaline conditions, and the cyanide removal effect is good; after the oxidation reaction of cyanide is completed, the salt is solidified in the particles and does not enter the waste water system; when stirring, two stages of frequency are used to make the formed particles The size is uniform; the gypsum added during granulation greatly improves the strength of the granules, which is beneficial to the construction of the landfill site.

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 the cyanide-containing waste residue 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, the pH If it is less than 7, it will directly cause hydrogen cyanide gas to overflow, which will cause danger to the operator. This method has high requirements for operation; in addition, it is difficult to feed chlorine gas into the waste residue to make it completely mix with all cyanide ions, and it is easy to cause insufficient reaction. , the situation of breaking cyanide is not complete; in addition, this method does not completely solve the solidification problem of high-salt cyanide-containing waste residue, high soluble salt exists in the waste residue and has not been solidified; if the bleaching powder oxidation method is used, this method also has the problem that the soluble salt has not been processed problem, unable to fundamentally solve the problem of stabilization and solidification of cyanide-containing waste residue with high soluble salt content