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Method of treating cyanide-containing waste residues by using chlorine dioxide aqueous solution

By using chlorine dioxide aqueous solution to treat cyanide-containing waste residue under alkaline conditions, spherical particles are formed, which solves the problems of cyanide removal and salt solidification in high-salt content waste residue, achieving low-cost and efficient treatment effects, and is suitable for large-scale deal with.

Active Publication Date: 2017-05-31
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0024] The cyanide-containing waste residue treated in this embodiment comes from the cyanate ester resin production workshop, and is measured according to HJ / T 299-2007 "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Method" and GB_T 15555.12-1995 "Solid Waste Corrosion Determination Glass Electrode Method" The pH value of the waste residue leachate was 9.59; according to HJ / T 299-2007 "Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" and HJ 484-2009 "The Determination Volumetric Method and Spectrophotometry of Water Cyanide" measured the waste residue leachate The content of cyanide is 97ppm; the content of sodium chloride in waste residue is 85%.

[0025] The processing method of the cyanogen-containing waste residue of the present embodiment may further comprise the steps:

[0026] ① Alkali adjustment. Transfer 20 g of cyanide-containing waste residue to be treated into a stirred reactor, and add 2 g of slaked lime powd...

Embodiment 2）

[0034] The cyanide-containing waste residue treated in this example comes from the cyanide-containing electroplating workshop, and the waste residue is measured according to HJ / T 299-2007 "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Method" and GB_T 15555.12-1995 "Solid Waste Corrosion Determination Glass Electrode Method" The pH value of the leachate is 9.23; according to HJ / T 299-2007 "Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" and HJ 484-2009 "Determination of Cyanide in Water by Volumetric Method and Spectrophotometric Method", the cyanide in the waste residue leachate was measured The content of the salt is 78ppm; the soluble salt content in the waste residue is 90%.

[0035] All the other are the same as embodiment 1 of the processing method of the cyanogen-containing waste residue of the present embodiment, difference is:

[0036] Step ① After alkali adjustment, according to HJ / T 299-2007 "Solid waste leachin...

Embodiment 3）

[0041] The cyanogen-containing waste residue that present embodiment handles is identical with embodiment 2.

[0042] All the other are the same as embodiment 1 of the processing method of the cyanogen-containing waste residue of the present embodiment, difference is:

[0043] Step ① After alkali adjustment, according to HJ / T 299-2007 "Solid waste leaching toxicity leaching method - sulfuric acid nitric acid method" and GB_T 15555.12-1995 "Solid waste Corrosivity determination - Glass electrode method", the pH value of the waste residue leachate is 10.12.

[0044] In step ②, add 10 mL of chlorine dioxide aqueous solution to the stirring reaction kettle under stirring state, and the chlorine dioxide content in the chlorine dioxide aqueous solution is 3% (calculated as steady-state chlorine dioxide). The mass ratio of the amount of chlorine dioxide aqueous solution added to the cyanide-containing waste residue to be treated in step 1 is 0.5-1:1 (0.5:1 in this embodiment).

[00...

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Abstract

The invention discloses a method of treating cyanide-containing waste residues by using a chlorine dioxide aqueous solution. The method comprises the following steps: (1) adjusting alkali, wherein the pH value of leach liquor of the waste residues after alkali is adjusted is 10-13; (2) cyanide breaking: adding the chlorine dioxide aqueous solution into a stirring reaction kettle in a stirring state; (3) granulating: adding slaked lime powder and powder of plaster of Paris into a material after the cyanide breaking reaction in the step (2) while stirring, and stirring the material in the reaction kettle after stirring to form uniform spherical particles; and (4) drying and curing: naturally airing and curing the particles in the stirring reaction kettle after granulation in the step (3) for 1-2 days. According to the method disclosed by the invention, cyanide is broken by virtue of a chlorination process in an alkaline condition, so that the cyanide removing effect is good; after oxidizing reaction of the cyanides, salts are cured in the particles but not enter a waste water system; during stirring, particles formed by applying two frequencies are uniform in size; the gypsum added during granulation greatly improves the strength of the particles, so that operating construction in a landfill is facilitated.

Description

[0001] This application is a divisional application of the invention patent application with the application number 201410296106.0 and the application date is June 27, 2014, and the invention name is "processing method of cyanide-containing waste residue". technical field [0002] The invention relates to dangerous goods treatment technology, in particular to a method for treating cyanide-containing waste residue with an aqueous solution of chlorine dioxide. Background technique [0003] 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 stan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/38A62D3/33A62D101/45A62D101/49
Owner JIANGSU UNIV OF TECH