Method for treating waste salt dregs containing cyanogen

Abstract

The invention relates to a processing method for cyanogens contained waste salt dredge, the process steps are: the cyanogens contained waste salt dredge is put into the drier to be heated; the heating temperature is controlled with 60-120deg.C, the carbinol and the alcohol volatilize from the dredge, the carbinol and the alcohol are reclaimed with high purity after beings cooled in the condenser; the cyanogens contained waste salt dredge without carbinol and alcohol is baked in oxygen condition, the oxide in the dredge is fully oxidized, the organic is oxidized or volatilized off, thus eliminates the cyanogens and organic in the salt dredge; the gas generated in the baking process is transmitted to the burning furnace, the temperature is not lower than 1100deg.C, thus the tail gas may accord the discharging standard.

Description

technical field [0001] The invention relates to a treatment method for industrial waste residues, in particular to a treatment method for cyanide-containing waste salt residue, which is mainly used for cyanide-containing waste salt residue produced in the production process of methyl cyanoacetate and ethyl cyanoacetate in the chemical industry processing. Background technique [0002] In the production process of certain chemical products in the chemical industry, a large amount of cyanide-containing waste salt residue is produced. Cyanide-containing waste residue is a highly toxic substance, if not treated, it will cause great harm to the environment and human beings. At present, chemical oxidation method, wet oxidation method (high temperature pressure oxidation method) and high temperature incineration method are generally used to remove cyanide and organic matter for cyanide-containing waste residue, but there are problems such as incomplete removal of cyanide and organ...

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Problems solved by technology

[0004] The existing treatment methods mainly contain the following: 1. The chemical oxidation method is used for treatment. The disadvantage of this method is that it needs to consume a large amount of oxidant, the cost is high, the removal rate of organic matter is low, and high-concentration salt-containing organic wastewater is produced, which needs to be further removed. Organic matter; 2. Wet oxidation method (high temperature pressurized hydrolysis method) treatment, although this method can remove cyanide and organic matter more thoroughly, it consumes a lot of energy, requires large equipment and investment, and produces high-concentration saline wastewater at the same time; 3. High-temperature incineration treatment, although this method does not produce high-concentration saline wastewater, but due to the low melting point of salt slag, and contains a large amount of flammable and explosive organic solvents, it is difficult to control the temperature of the primary combustion chamber, the combustion is incomplete, and the removal of cyanide At the same time, the molten salt slag affects the normal use of the incinerator. Due to the large air volume of the exhaust gas, the operating cost of the secondary combustion chamber is extremely high. This method can only be used in laboratories and is not feasible in industry.

Many manufacturers just use the stacking method, causing serious hidden dangers to humans and the environment

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