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A kind of method of the cyanide complex of low-temperature catalytic pyrolysis iron

A low-temperature catalysis and complex technology, applied in the direction of protection devices against harmful chemicals, etc., can solve the problems of lack of economical and effective treatment methods, and achieve the effects of less equipment investment, avoiding pollution and simple process

Active 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

[0004] The existing treatment methods are mainly aimed at the waste water of iron-containing cyanide complexes, and there are few reports on the treatment methods of iron-containing cyanide complex soils or waste residues. For solid iron-containing cyanide complexes or iron-containing cyanide complexes As far as the soil or waste residue of waste is concerned, there is still a lack of economical and effective treatment methods

Method used

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  • A kind of method of the cyanide complex of low-temperature catalytic pyrolysis iron
  • A kind of method of the cyanide complex of low-temperature catalytic pyrolysis iron
  • A kind of method of the cyanide complex of low-temperature catalytic pyrolysis iron

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Effect test

Embodiment 1

[0034] A method for low-temperature catalytic pyrolysis of iron cyanide complexes, comprising the steps of:

[0035] (1) With 99% sodium ferrocyanide decahydrate solid pure reagent waste as raw material, copper oxide is added in the raw material, and described copper oxide and sodium ferrocyanide decahydrate solid pure reagent are calculated as 1 by mass ratio: 5. Mix evenly to make mixed raw materials;

[0036] (2) Put the mixed raw material into a roasting furnace with an air atmosphere, heat it to 300°C at a heating rate of 5°C / min for catalytic thermal decomposition, and when the temperature reaches 300°C, keep it warm for 180 minutes to remove ferrocyanide Sodium, to obtain pyrolysis slag and pyrolysis tail gas; the chemical reaction equations involved in the pyrolysis process include:

[0037]

[0038] (3) Store the obtained thermal decomposition slag directly.

[0039] After testing, it was found that the original sodium ferrocyanide content in the mixed material w...

Embodiment 2

[0041]A method for low-temperature catalytic pyrolysis of iron cyanide complexes, comprising the steps of:

[0042] (1) With 99% sodium ferrocyanide decahydrate solid pure reagent waste as raw material, iron oxide is added to the raw material, specifically a mixture of iron oxide, ferric oxide and ferrous oxide in a mass ratio of 1:4 : 2 mixtures formed by mixing, the iron oxide and sodium ferrocyanide decahydrate solid pure reagent are counted as 1:10 by mass ratio, mixed uniformly, and mixed raw materials are made;

[0043] (2) Put the mixed raw material into a rotary kiln with an air atmosphere, heat it to 550°C at a heating rate of 30°C / min for thermal decomposition, and when the temperature reaches 550°C, remove sodium ferrocyanide to obtain heat Decomposition slag and thermal decomposition tail gas; the chemical reaction equations involved in the thermal decomposition process include:

[0044]

[0045] (3) Store the obtained thermal decomposition slag directly.

[0...

Embodiment 3

[0048] A method for low-temperature catalytic pyrolysis of iron cyanide complexes, comprising the steps of:

[0049] (1) With 99.5% potassium ferricyanide solid reagent waste as raw material, add copper oxide and iron oxide in the raw material and mix the mixture that is 1:2 by mass ratio, as catalyst, described catalyst and potassium ferricyanide solid The pure reagent is calculated as 1:4 by mass ratio, and mixed evenly to make a mixed raw material;

[0050] (2) Put the mixed raw materials into a roasting furnace with an oxygen atmosphere, heat up to 400°C at a heating rate of 10°C / min for catalytic thermal decomposition, and when the temperature reaches 400°C, keep it warm for 10 minutes to remove potassium ferricyanide , to obtain thermal decomposition slag; the chemical reaction equations involved in the thermal decomposition process include:

[0051]

[0052] (3) Store the obtained thermal decomposition slag directly.

[0053] After testing, it was found that the or...

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Abstract

A method for low-temperature catalytic pyrolysis of iron cyanide complexes of the present invention, the steps are: adding a catalyst to raw materials, the raw materials being solid iron cyanide complexes or soil or waste residue of iron-containing cyanide complexes , mixed evenly to make a mixed raw material; put the mixed raw material into a pyrolysis device, heat it to 300-550°C for catalytic thermal decomposition, and when the temperature reaches 300-550°C, keep it warm for 0-180min to remove iron cyanide The compound is obtained from pyrolysis slag, which can be directly stockpiled or used for backfill treatment. The beneficial effects of the present invention are: through low-temperature thermal decomposition, oxidizing atmosphere and the action of a catalyst, the clean conversion of solid iron cyanide complexes or iron-containing cyanide complexes is realized, and the iron cyanide complexes are oxidized into The invention has no toxic compound, low cost and good effect of removing iron cyanide complexes, and the removal rate of iron cyanide complexes reaches over 99%. 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 environmental protection, in particular to a method for catalyzing and pyrolyzing iron cyanide complexes at low temperature. Background technique [0002] The cyanide complexes of iron mainly include ferricyanide and ferrocyanide, which are very stable in chemical properties at normal temperature and pressure, and Fe can hardly be detected in the solution. 2+ / Fe 3+ 、CN - Ions are difficult to be biochemically oxidized and removed by ordinary chemical oxidation methods. From the perspective of polluting the environment, ferricyanide and ferrocyanide are less toxic, but heating for a long time, especially under light conditions, can easily lead to hydration reactions to produce [Fe(CN)·HO] and highly toxic hydrogen cyanide (HCN), and once ferricyanide and ferrocyanide enter the complex solution, if they encounter humic acid and polypeptide ions with stronger complexing ability than iron ions, they will release hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/40A62D101/43A62D101/45A62D101/47
CPCA62D3/40A62D2101/43A62D2101/45A62D2101/47
Inventor 董凯伟王伟谢锋畅永锋路殿坤白云龙高鹏符岩
Owner NORTHEASTERN UNIV LIAONING
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