A 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, simple process and no secondary pollution

Inactive Publication Date: 2021-07-27
NORTHEASTERN UNIV LIAONING
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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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  • A method for catalytic thermal decomposition to remove zinc cyanide complex
  • A method for catalytic thermal decomposition to remove zinc cyanide complex
  • A method for catalytic thermal decomposition to remove zinc cyanide complex

Examples

Experimental program
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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 removing zinc-cyanide complexes by catalytic thermal decomposition of the present invention comprises the steps of: adding a catalyst to solid zinc-cyanide complexes or raw materials containing zinc-cyanide complexes, the raw materials being prepared as mixed Raw material; the quality of the catalyst is not less than 1% of the quality of the zinc-cyanide complex contained in the raw material; the mixed raw material is put into a thermal decomposition device, heated to 250-470°C for thermal decomposition, when the temperature reaches 250-470 After 0°C, keep warm for 0-150 minutes to remove the zinc-cyanide complex and obtain thermal decomposition clinker; directly store the obtained thermal decomposition clinker or use it for backfill treatment or secondary utilization. The beneficial effects of the present invention are: under the action of catalyst, thermal decomposition and oxidation atmosphere, the clean conversion of solid zinc-cyanide complex or zinc-cyanide complex is realized, the cost is low and the effect of removing zinc-cyanide complex is good; The thermally decomposed clinker after low-temperature thermal decomposition meets the requirements of ordinary solid waste. The invention has simple process, less equipment investment, no secondary pollution, and is easy to popularize.

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 Patents(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 LIAONING
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