Method for catalyzing and oxidizing thiocyanide

A thiocyanide and cyanide technology, applied in the chemical industry, can solve the problems of high ozone cost, high equipment material requirements, large energy consumption, etc., and achieve the effects of no secondary pollution, less equipment investment and simple process

Active Publication Date: 2019-08-09
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wet oxidation method has a remarkable treatment effect, but has high requirements for equipment materials, high equipment investment and post-maintenance costs
Chlorine oxidation method has simple process and low investment in equipment, but consumes a lot of chemicals
The ozone process is simple and has no secondary pollution, but the cost of ozone is high, energy consumption is high, equipment maintenance is difficult, and industrial application and promotion are difficult
[0004] The existing treatment methods are mainly aimed at wastewater containing thiocyanide. For thiocyanide solids or thiocyanide-containing waste residues, they are mainly dissolved in water, and then the aqueous solution is treated, but the insoluble thiocyanide cannot be treated. , mainly stockpiled because of its toxicity
For solid thiocyanide or waste residue containing thiocyanide, there is still a lack of economical and effective treatment methods

Method used

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  • Method for catalyzing and oxidizing thiocyanide
  • Method for catalyzing and oxidizing thiocyanide
  • Method for catalyzing and oxidizing thiocyanide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A method for catalytic oxidation of thiocyanide, comprising the steps of:

[0048] (1) With the solid reagent waste material containing 98.5% CuSCN as the raw material, add catalyst iron oxide and additive lime in the raw material, the catalyst is specifically copper oxide, the iron oxide and the thiocyanide contained in the raw material The mass ratio is 2:1, the mass ratio of available calcium oxide in the lime to the raw material is 4:10; mix evenly to make mixed raw material;

[0049] (2) Put the mixed raw material into a rotary kiln with an air atmosphere, and heat it from room temperature to 300°C at a heating rate of 6°C / min for thermal decomposition. When the temperature reaches 300°C, keep it warm for 120min to remove thiocyanide. Obtain pyrolysis material and pyrolysis gas; chemical reactions that occur during pyrolysis include:

[0050]

[0051]

[0052]

[0053] CaO+SO 2 →CaSO 3 ;

[0054] (3) directly stockpiling the obtained thermal decomposit...

Embodiment 2

[0057] A method for catalytic oxidation of thiocyanide, comprising the steps of:

[0058] (1) With the solid reagent waste material that contains 98.5% KSCN as raw material, add cobalt oxide and additive lime in raw material, the rhodanide contained in described cobalt oxide and raw material is counted as 1: 1 by mass ratio, in described lime The mass ratio of effective calcium oxide to raw materials is 6:10; mix evenly to make mixed raw materials;

[0059] (2) Put the mixed raw material into a rotary kiln with an air atmosphere, heat it to 370°C at a heating rate of 15°C / min for thermal decomposition, and when the temperature reaches 370°C, keep it warm for 15 minutes to remove thiocyanide and obtain heat Decomposition materials; chemical reactions that occur during pyrolysis include:

[0060]

[0061] CaO+SO 2 →CaSO 3

[0062] (3) directly stockpiling the obtained thermal decomposition material.

[0063] After testing, it was found that in the thermal decomposition p...

Embodiment 3

[0065] A method for catalytic oxidation of thiocyanide, comprising the steps of:

[0066] (1) With the solid reagent waste material that contains 98.5% KSCN as raw material, add nickel oxide and additive lime in raw material, the sulfur cyanide contained in described nickel oxide and raw material is counted as 1: 2 by mass ratio, in described lime The mass ratio of effective calcium oxide to raw materials is 8:10; mix evenly to make mixed raw materials;

[0067] (2) Put the mixed raw material into a roasting furnace with an oxygen atmosphere, heat it to 450°C at a heating rate of 20°C / min for thermal decomposition, and when the temperature reaches 450°C, remove the thiocyanide to obtain the thermally decomposed material; The chemical reactions that occur include:

[0068]

[0069] CaO+SO 2 →CaSO 3

[0070] (3) directly stockpiling the obtained thermal decomposition material.

[0071] After testing, it was found that in the thermal decomposition process, the content of ...

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PUM

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Abstract

The invention discloses a method for catalyzing and oxidizing thiocyanide. The method includes the following steps that (1) solid thiocyanide or a thiocyanide-containing material serves as a raw material, a catalyst is added, even mixing is conducted, and a mixed raw material is prepared; (2) the mixed raw material is put into a thermal decomposition device, and is heated to 300 DEG C to 600 DEG Cat temperature-increasing speed of 5 DEG C / min to 50 DEG C / min and subjected to thermal decomposition, and after the temperature is 300 DEG C to 600 DEG C, heat preservation is conducted for 0 min to120 min, the thiocyanide is removed, and a thermal decomposition material is obtained; (3) the thermal decomposition material is directly piled up or used for backfilling treatment. According to themethod, at the atmosphere and under an effect of the catalyst, clean conversion of the thiocyanide-containing material is achieved, the cost is low, an effect of removing the thiocyanide is good, andthe removing rate of the thiocyanide is 99% or above; a lime additive and SO2 generated in the catalyzing and oxidizing process are subjected to a chemical reaction, calcium sulfite is obtained, and secondary pollution to the environment in the thermal decomposition process is avoided; the thermal decomposition material can be selected and piled up or used for backfilling or serves as a secondaryresource for reuse according to ingredients of the thermal decomposition material.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a method for catalytically oxidizing thiocyanide. Background technique [0002] Thiocyanide is a compound containing thiocyanate ion (SCN-). Easy to form coordination compounds with metal ions. Thiocyanate and iron (III) ions can form a blood-red coordination compound, which is often used to detect thiocyanate and iron (III) ions. Reductive, can react with manganese dioxide to generate sulfur cyanide (SCN) 2 . Heavy metal thiocyanides are poorly soluble in water. Alkali metal thiocyanides are easily soluble in water and are commonly used reagents, such as potassium thiocyanate and ammonium thiocyanate, which are mainly used in printing and dyeing. Thiocyanide is generally low in toxicity, but it reacts with strong oxidizing substances such as concentrated nitric acid, potassium permanganate, and hydrogen peroxide, and easily produces highly toxic HCN, which poses great harm ...

Claims

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Application Information

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IPC IPC(8): A62D3/40A62D101/45A62D101/47
CPCA62D3/40A62D2101/45A62D2101/47
Inventor 谢锋畅永锋董凯伟路殿坤王伟符岩路雨禾白云龙
Owner NORTHEASTERN UNIV
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