CN101318064A - Method for detoxicating chromic slag with reductive gas - Google Patents
Method for detoxicating chromic slag with reductive gas Download PDFInfo
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- CN101318064A CN101318064A CNA2007100492538A CN200710049253A CN101318064A CN 101318064 A CN101318064 A CN 101318064A CN A2007100492538 A CNA2007100492538 A CN A2007100492538A CN 200710049253 A CN200710049253 A CN 200710049253A CN 101318064 A CN101318064 A CN 101318064A
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- chromium slag
- chromium
- reducibility gas
- slag
- detoxification
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Abstract
The invention relates to a method for detoxicating chromium slag. In the invention, when the temperature of the chromium slag ranging from 350 DEG C to 750 DEG C is reached by heating, a reducing gas is pumped into the chromium slag for more than five seconds; at last the chromium slag is cooled. In the method, a redox reaction is carried out by utilizing the reducibility of the reducing gas and the oxidizability of hexavalent chromium in the chromium slag at a high temperature so as to reduce the hexavalent chromium into trivalent chromium or chromium with lower valent so that the toxicity of the water-soluble and the acid-soluble hexavalent chromium can be removed from the chromium slag. The method can completely remove the hexavalent chromium from the chromium slag. The detoxicated chromium slag can be used for cement blending material or other purposes without causing secondary pollution.
Description
(1) technical field
The present invention carries out method for detoxification to the chromium slag for a kind of, particularly utilizes reducibility gas to make Cr VI in the chromium slag become the method for the chromium of trivalent chromium or lower compound, to separate water-soluble Cr VI and the chromic toxicity of solubility in acid in the dechromisation slag.
(2) background technology
Most of with calcareous filler in the current chromium salt production, as dolomite, the same chromite of lime stone, soda ash and the roasting of part chromium slag mixed powder, the chromium quantity of slag that this explained hereafter chromic salts is discharged is big, produces sodium dichromate per ton and produces 2～2.5 tons of chromium slags.Owing to contain Cr VI in the chromium slag, up to 2～3% (chromium trioxide meters), and contain insoluble calcium chromate in the chromium slag with water, it is a kind of carcinogen, so no matter a large amount of chromium slags are discarded still utilize, as not removing toxin (the insoluble calcium chromate of water-soluble Cr VI and water) wherein, will cause very big threat and destruction to human and environment.The most frequently used method of chromium residue detoxifying has two kinds at present, is dry method, uploads clear said method at " chromium compound production application " periodical that Chemical Industry Press published on February 1st, 2003.Be a kind of be that the chromium slag utilizes coal roasting reduction detoxifcation in cyclone furnace; Another is that the chromium slag detoxifies with the coal roasting reduction in rotary kiln.Because have defective on above-mentioned two kinds of method technologies, reducing condition is not good, the reducing agent deficiency, thorough reduction of hexavalent chromium, the easy brightness reversion of chromium slag of reduction makes Cr VI produce pollution.
(3) summary of the invention
The objective of the invention is to overcome above-mentioned prior art deficiency, provide a kind of reducibility gas that utilizes that the chromium slag is carried out method for detoxification.This method can be separated water-soluble Cr VI and solubility in acid Cr VI in the dechromisation slag more completely, and the chromium slag after the detoxifcation can be used for cement admixture or other purposes, non-secondary pollution.
Solution of the present invention is: utilize reducibility gas that the chromium slag is carried out method for detoxification, feed reducibility gas after being characterized in the chromium slag is heated to 350～750 ℃, keep at last the chromium slag being cooled to below 300 ℃ more than 5 seconds.
Reducibility gas can adopt electrothermal way to produce yellow phosphorus waste gas tool in the solution of the present invention, also can adopt coal gas.Reproducibility and chromic oxidisability by above-mentioned reducibility gas, reducibility gas and Cr VI generation redox reaction, make Cr VI become the chromium of trivalent chromium or lower compound, thereby separate depth of water Cr VI and the chromic toxicity of solubility in acid in the dechromisation slag.
Chromium slag heating and temperature control is 500～600 ℃ of best results in the solution of the present invention.
In the solution of the present invention for make the chromium slag fully and reducibility gas react, can adopt chromium slag fineness is 20～500 orders.
In the solution of the present invention the chromium slag being heated the back process that feeds reducibility gas can carry out in conveying worm or in the vibrated fluidized bed or in the fluidized bed furnace.
The type of cooling can adopt the feeding reducibility gas to cool off in the solution of the present invention.
Advantage of the present invention: the present invention feeds reducibility gas by the chromium slag being heated the back, utilize that redox reaction at high temperature takes place chromic oxidisability in the reproducibility of reducibility gas and the chromium slag, make Cr VI become the chromium of trivalent chromium or lower compound, thereby separate water-soluble Cr VI and the chromic toxicity of solubility in acid in the dechromisation slag.The present invention can separate Cr VI in the dechromisation slag completely, and the chromium slag content of 6-valence Cr ions after the detoxifcation is zero.Chromium slag after the detoxifcation can be used for cement admixture or other purposes, non-secondary pollution.
(4) specific embodiment
Detailed rules for the implementation: utilize reducibility gas that the chromium slag is carried out method for detoxification and carry out according to the following steps:
A, with chromium slag oven dry, be crushed to 100 orders;
In B, the conveying worm with 4.4 meters of chromium slag addings, 2 meters of bringing-up sections are heated to 600 ℃ with the chromium slag;
C, logical nitrogen are driven the oxygen in the conveying worm away;
D, the industrial waste gas that will contain carbon monoxide charge into and keep inflation 20 minutes in the conveying worm;
E, the reducibility gas that charges into cooling from the other end cool off the chromium slag;
CO gas in the chromium slag is handled in F, discharging.
Present embodiment is thoroughly separated the Cr VI in the dechromisation slag.
Embodiment 2: utilize the reproducibility oxidation that the chromium slag is carried out method for detoxification and carry out according to the following steps:
A, with chromium slag oven dry, be crushed to 200 orders;
B, will the chromium slag add in the sealing thermal vibration fluid bed and be heated to 500 ℃;
C, logical nitrogen are driven oxygen away;
D, in vibrated fluidized bed, feed coal gas, keep inflation 10 minutes;
E, in the feed bin of semi-hermetic, cool off, be full of reducibility gas in the feed bin;
The water-gas in the chromium slag is handled in F, discharging.
Claims (7)
1, a kind of reducibility gas that utilizes carries out method for detoxification to the chromium slag, feeds reducibility gas after it is characterized in that the chromium slag is heated to 350～750 ℃, keeps at last the chromium slag being cooled to below 300 ℃ more than 5 seconds.
2, the reducibility gas that utilizes according to claim 1 carries out method for detoxification to the chromium slag, it is characterized in that described reducibility gas is the waste gas that electrothermal way is produced yellow phosphorus.
3, the reducibility gas that utilizes according to claim 1 carries out method for detoxification to the chromium slag, it is characterized in that described reducibility gas is a coal gas.
4, the reducibility gas that utilizes according to claim 1 carries out method for detoxification to the chromium slag, it is characterized in that chromium slag fineness is 20～500 orders.
5, the reducibility gas that utilizes according to claim 1 carries out method for detoxification to the chromium slag, it is characterized in that the chromium slag is heated back feeding reducibility gas to carry out in conveying worm or in the vibrated fluidized bed or in the fluidized bed furnace or in the rotary kiln.
6, the reducibility gas that utilizes according to claim 1 carries out method for detoxification to the chromium slag, it is characterized in that the type of cooling is to feed the reducibility gas cooling.
7, the reducibility gas that utilizes according to claim 1 carries out method for detoxification to the chromium slag, it is characterized in that chromium slag heating and temperature control is at 500～600 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100492538A CN101318064A (en) | 2007-06-07 | 2007-06-07 | Method for detoxicating chromic slag with reductive gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100492538A CN101318064A (en) | 2007-06-07 | 2007-06-07 | Method for detoxicating chromic slag with reductive gas |
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| Publication Number | Publication Date |
|---|---|
| CN101318064A true CN101318064A (en) | 2008-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CNA2007100492538A Pending CN101318064A (en) | 2007-06-07 | 2007-06-07 | Method for detoxicating chromic slag with reductive gas |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103611410A (en) * | 2013-12-17 | 2014-03-05 | 四川省银河化学股份有限公司 | Method for treating yellow phosphorus tail gas |
| CN103978007A (en) * | 2013-10-28 | 2014-08-13 | 青岛理工大学 | Fluidized bed type of harmless chromium slag pyrolysis process |
| CN105039615A (en) * | 2015-09-08 | 2015-11-11 | 华北理工大学 | Processing method for stockpiled AOD stainless steel slag |
| CN105080934A (en) * | 2015-08-24 | 2015-11-25 | 昆明理工大学 | Method for reducing chromium slags from ferroalloy fume |
| CN105542813A (en) * | 2016-01-19 | 2016-05-04 | 青岛理工大学 | Biomass recycling and chromium slag harmless synchronization technique |
| CN105670667A (en) * | 2016-01-19 | 2016-06-15 | 青岛理工大学 | Method for synchronously treating chromium slag and chlorine-free plastics |
| CN108785952A (en) * | 2018-05-21 | 2018-11-13 | 北京高能时代环境技术股份有限公司 | Middle low temperature hydrogen reduced chromium slag and muck mixture equipment and its reduction and detoxication method |
-
2007
- 2007-06-07 CN CNA2007100492538A patent/CN101318064A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103978007A (en) * | 2013-10-28 | 2014-08-13 | 青岛理工大学 | Fluidized bed type of harmless chromium slag pyrolysis process |
| CN103978007B (en) * | 2013-10-28 | 2016-01-13 | 青岛理工大学 | A kind of fluidized bed type chromium slag pyrolysis butanedionedioxime |
| CN103611410A (en) * | 2013-12-17 | 2014-03-05 | 四川省银河化学股份有限公司 | Method for treating yellow phosphorus tail gas |
| CN105080934A (en) * | 2015-08-24 | 2015-11-25 | 昆明理工大学 | Method for reducing chromium slags from ferroalloy fume |
| CN105039615A (en) * | 2015-09-08 | 2015-11-11 | 华北理工大学 | Processing method for stockpiled AOD stainless steel slag |
| CN105039615B (en) * | 2015-09-08 | 2017-09-01 | 华北理工大学 | Store up the processing method of AOD stainless steel slags |
| CN105542813A (en) * | 2016-01-19 | 2016-05-04 | 青岛理工大学 | Biomass recycling and chromium slag harmless synchronization technique |
| CN105670667A (en) * | 2016-01-19 | 2016-06-15 | 青岛理工大学 | Method for synchronously treating chromium slag and chlorine-free plastics |
| CN105670667B (en) * | 2016-01-19 | 2019-05-07 | 青岛理工大学 | A kind of synchronization process chromium slag and the method without chlorine plastics |
| CN105542813B (en) * | 2016-01-19 | 2019-08-20 | 青岛理工大学 | A kind of biomass as resources and chromic slag harmlessness synchronous method |
| CN108785952A (en) * | 2018-05-21 | 2018-11-13 | 北京高能时代环境技术股份有限公司 | Middle low temperature hydrogen reduced chromium slag and muck mixture equipment and its reduction and detoxication method |
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