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Method for catalytic thermal decomposition to remove zinc-cyanide complex

A complex and thermal decomposition technology, applied in the chemical industry, can solve the problems of lack of economical, effective and environmentally friendly treatment methods, and achieve the effects of less equipment investment, no secondary pollution, and easy promotion.

Inactive Publication Date: 2019-08-06
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing treatment methods are mainly aimed at the electroplating wastewater containing zinc-cyanide complexes, and the treatment of sludge or waste residues containing zinc-cyanide complexes. At present, there is still a lack of economical, effective, and environmentally friendly treatment methods.

Method used

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  • Method for catalytic thermal decomposition to remove zinc-cyanide complex
  • Method for catalytic thermal decomposition to remove zinc-cyanide complex
  • Method for catalytic thermal decomposition to remove zinc-cyanide complex

Examples

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Effect test

Embodiment 1

[0032] A method for catalytic thermal decomposition to remove zinc cyanide complex, comprising the steps of:

[0033] (1) Using zinc cyanide solid reagent waste as raw material, the mass ratio of zinc cyanide in the waste is 90%, adding copper oxide and iron oxide mixture in the raw material, the mass ratio is 2: 1, the mixture and the raw material The zinc-cyanide complex contained is calculated as 1:1 by mass ratio, and mixed evenly to make a mixed raw material;

[0034] (2) Put the mixed raw materials into a roasting furnace with an air atmosphere, heat up to 400°C at a heating rate of 25°C / min for thermal decomposition, and when the temperature reaches 400°C, keep warm for 15 minutes to remove the zinc-cyanide complex to obtain thermal decomposition clinker; the chemical reaction equations involved in the thermal decomposition process include:

[0035]

[0036] (3) directly stockpiling the obtained thermal decomposition clinker.

[0037] After testing, it was found th...

Embodiment 2

[0039] A method for catalytic thermal decomposition to remove zinc cyanide complex, comprising the steps of:

[0040] (1) With zinc cyanide solid reagent waste as raw material, zinc cyanide mass ratio is 90% in this waste material, copper oxide is added in raw material, the zinc cyanide complex contained in described copper oxide and raw material is by mass ratio Calculated as 1:2, mixed evenly to make mixed raw materials;

[0041] (2) Put the mixed raw materials into a roasting furnace with an air atmosphere, heat up to 350°C at a heating rate of 5°C / min for thermal decomposition, and when the temperature reaches 350°C, keep warm for 90 minutes to remove the zinc-cyanide complex to obtain thermal decomposition clinker; the chemical reaction equations involved in the thermal decomposition process include:

[0042]

[0043] (3) directly stockpiling the obtained thermal decomposition clinker.

[0044]After testing, it was found that the initial zinc cyanide content in the m...

Embodiment 3

[0046] A method for catalytic thermal decomposition to remove zinc cyanide complex, comprising the steps of:

[0047] (1) Sodium zinc cyanate (Na 2 Zn(CN) 4 ) Reagent waste as raw material, sodium zinc cyanate mass ratio is 90% in this waste material, adds iron oxide in raw material, and iron oxide is specifically iron oxide, ferric oxide and ferrous oxide and is 1 by mass ratio: The mixture formed by mixing 1:1, the iron oxide and the zinc-cyanide complex contained in the raw material are calculated at a mass ratio of 7:10, and mixed uniformly to make a mixed raw material;

[0048] (2) Put the mixed raw materials into a roasting furnace with an air atmosphere, heat up to 470°C at a heating rate of 30°C / min for thermal decomposition, and when the temperature reaches 470°C, complete the thermal decomposition and remove the zinc-cyanide complex to obtain thermal decomposition clinker; the chemical reaction equations involved in the thermal decomposition process include:

[00...

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Abstract

A method for catalytic thermal decomposition to remove a zinc-cyanide complex is provided. The method includes adding a catalyst into a solid zinc-cyanide complex raw material or a raw material containing the zinc-cyanide complex to prepare a raw material mixture, with the mass of the catalyst being not less than 1% of the mass of the zinc-cyanide complex in the raw material; adding the raw material mixture into a thermal decomposition device, heating the mixture to 250-470 DEG C for thermal decomposition, and maintaining the temperature for 0-150 min when the temperature is 250-470 DEG C to remove the zinc-cyanide complex and obtain a thermal decomposition clinker; directly stacking the obtained clinker or utilizing the clinker for backfill treatment or secondary utilization. Beneficial effects of the method are that clean conversion of the solid zinc-cyanide complex raw material or the raw material containing the zinc-cyanide complex is achieved under the functions of the catalyst, thermal decomposition and oxidation atmosphere, the cost is low, the zinc-cyanide complex removing effect is good, and the thermal decomposition clinker after low-temperature thermal decomposition reaches requirements on ordinary solid waste. The method has characteristics including a simple process, low equipment investment, no secondary pollution and easy promotion.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for removing zinc-cyanide complex by catalytic thermal decomposition. Background technique [0002] The cyanide galvanizing process is still widely used by military units due to its advantages such as fine crystallization of the coating, good gloss, strong dispersion ability of the plating solution, and mature technology. During the use of cyanide galvanizing, galvanizing wastewater and sludge will be generated. Zinc-cyanide complexes mainly appear as CN in wastewater - , Zn(CN) 4 2- These two forms exist, when the pH of the wastewater is less than 9, the cyanide is easy to react with H + Combined, the highly volatile and highly toxic gas HCN is generated, which seriously endangers the ecological balance and human health. Therefore, the treatment of cyanide-containing wastewater must be carried out under alkaline conditions. At present, the methods for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/38B01D53/81B01D53/48A62D101/45
CPCA62D3/38A62D2101/45B01D53/48B01D53/81B01D2251/404B01D2251/602
Inventor 王伟董凯伟谢锋路殿坤白云龙符岩畅永锋路雨禾
Owner NORTHEASTERN UNIV
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