CN1792481A - Process for detoxicating chrome slag in rotating kiln - Google Patents
Process for detoxicating chrome slag in rotating kiln Download PDFInfo
- Publication number
- CN1792481A CN1792481A CN 200610000020 CN200610000020A CN1792481A CN 1792481 A CN1792481 A CN 1792481A CN 200610000020 CN200610000020 CN 200610000020 CN 200610000020 A CN200610000020 A CN 200610000020A CN 1792481 A CN1792481 A CN 1792481A
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- Prior art keywords
- slag
- chromium
- chromium slag
- rotary kiln
- sulphur
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Abstract
A process for detoxicating Cr slag by rotary kiln includes such steps as mixing Cr slag with sulfur in rotary kiln, calcining at 500-1000 deg.C for generating SO2, using SO2 to reduce Cr slag for removing water-soluble Cr and acid-soluble Cr, using the residual dreg to produce cement, and using the tail gas to prepare sulfuric acid.
Description
Technical field
The present invention is for utilizing in the rotary kiln the chromium residue detoxifying method, thereby particularly sprays into the method that powdery sulphur sulphur reduced chromium slag is separated water-soluble sexavalence and the insoluble calcium chromate of water in the dechromisation slag in rotary kiln.
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, and sodium dichromate per ton 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.Upload 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.
Summary of the invention
The objective of the invention is to overcome above-mentioned prior art deficiency, a kind of method of utilizing rotary kiln to chromium residue detoxifying is provided, particularly in rotary kiln, spray into powdery sulphur sulphur reduced chromium slag.This method can be separated the insoluble calcium chromate with water of water-soluble Cr VI in the dechromisation slag more completely.
Specifically, the invention provides a kind of powdery sulphur that in rotary kiln, sprays into the chromium slag is carried out method for detoxification.
The present invention utilizes the powdery sulphur sulfur dioxide that (sintering temperature is 500 ℃～1000 ℃) produces when the revolution roasting in kilns, Cr VI (water-soluble chromium and sour molten chromium) in the abundant reduced chromium slag, make Cr VI can obtain reducing more completely, content of 6-valence Cr ions is zero in the chromium slag of detoxifcation back.The detoxification chromium slag that produces in the roasting can be used as high-efficiency cement admixture or other purposes, and the tail gas that roasting produces is used for the raw material of gas washing in SA production.Non-secondary pollution.
In the specific embodiments of the present invention, adopt the powdery sulphur excessive with respect to the chromium quantity of slag, for example chromium slag: the weight ratio of Cosan is 1: 1.05-2 is preferably 1: 1.1-1.8.Powdery sulphur is oxidized to SO in rotary kiln
2, SO
2With Cr
6+Be reduced into Cr
3+Thereby, the toxicity of separating the dechromisation slag.
The fineness of powdery sulphur is 0.01～1mm among the present invention.The fineness of chromium slag is 0.001～20mm.
When adopting the inventive method, spraying into the material feeding manner is following current or reflux type.
The straying quatity of powdery sulphur is not crucial among the present invention, get final product with respect to the chromium slag is excessive, and generally speaking excessive degree depend on fineness of powder and spray into speed, and powder is thinner, and it is slower to spray into speed, reaction more fully, required Cosan just more lacks.Association between them is implemented just can determine by routine.Cosan also can be infinity, the production material SO of main production this moment sulfuric acid
2, chromium residue detoxifying is less important.
The specific embodiment
The invention will be further described hereinafter to adopt non-limiting embodiment.
Embodiment 1:
A, with 30kg chromium slag, fineness is 5mm, adds experiment revolution roasting in kilns and also sprays into powdery sulphur (fineness is 0.1mm), recovery time is 150 minutes, and spraying into speed is 0.1kg/min, and kiln temperature is controlled to be 700～800 ℃, reduced fully up to the chromium slag, it is 15kg that sulphur sprays into total amount.
B, detoxifcation back chromium slag testing result: non-hexavalent chromium in the detoxification chromium slag, total chrome content is zero in the tail gas.
Embodiment 2:
A, with 40kg chromium slag, fineness is 5mm, adds experiment revolution roasting in kilns and also sprays into Cosan (fineness is 0.05mm), spraying into speed is 0.13kg/min, kiln temperature is controlled to be 700～800 ℃, up to reacting completely, the sulphur straying quatity is 20kg.
B, detoxifcation back chromium slag testing result: non-hexavalent chromium in the detoxification chromium slag, total chrome content is zero in the tail gas.
Embodiment 3:
A, with 60kg chromium slag, fineness is 5mm, adds experiment revolution roasting in kilns and also sprays into Cosan (fineness is 0.5mm), spraying into speed is 0.2kg/min, kiln temperature is controlled to be 700～800 ℃, up to reacting completely, the sulphur straying quatity is 30kg.
B, detoxifcation back chromium slag testing result: non-hexavalent chromium in the detoxification chromium slag, total chrome content is zero in the tail gas.
Claims (7)
1, a kind of rotary kiln that utilizes carries out method for detoxification to the chromium slag, it is characterized in that the chromium slag sprays into Cosan when carrying out roasting in rotary kiln and reduces.
2, method according to claim 1 is characterized in that spraying into the powdery sulphur excessive with respect to the chromium slag.
3, according to the method for claim 2, it is characterized in that the chromium slag: the weight ratio of sulphur is 1: 1.05-2.
4, according to arbitrary method of claim 1-3, the granularity that it is characterized in that Cosan is 0.001～1mm.
5, according to arbitrary method of claim 1-4, the fineness that it is characterized in that the chromium slag is 0.001～20mm.
6, according to arbitrary method of claim 1-5, it is characterized in that the chromium slag sprays into Cosan when carrying out roasting in rotary kiln and reduces, sintering temperature is controlled at 500～1000 ℃.
7,, it is characterized in that the material feeding manner is following current or reflux type according to the arbitrary described method of claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610000020 CN1792481A (en) | 2006-01-04 | 2006-01-04 | Process for detoxicating chrome slag in rotating kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610000020 CN1792481A (en) | 2006-01-04 | 2006-01-04 | Process for detoxicating chrome slag in rotating kiln |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1792481A true CN1792481A (en) | 2006-06-28 |
Family
ID=36804244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610000020 Pending CN1792481A (en) | 2006-01-04 | 2006-01-04 | Process for detoxicating chrome slag in rotating kiln |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1792481A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100464910C (en) * | 2007-05-24 | 2009-03-04 | 上海交通大学 | Pyrolytic treatment method for chromium slag |
| CN102978376A (en) * | 2012-12-05 | 2013-03-20 | 武汉工程大学 | Process for reduction detoxication of chromic slag by adopting dry method |
| CN109771883A (en) * | 2019-03-06 | 2019-05-21 | 昆明理工大学 | A method of utilizing sulphur coal detoxification chromium slag |
-
2006
- 2006-01-04 CN CN 200610000020 patent/CN1792481A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100464910C (en) * | 2007-05-24 | 2009-03-04 | 上海交通大学 | Pyrolytic treatment method for chromium slag |
| CN102978376A (en) * | 2012-12-05 | 2013-03-20 | 武汉工程大学 | Process for reduction detoxication of chromic slag by adopting dry method |
| CN109771883A (en) * | 2019-03-06 | 2019-05-21 | 昆明理工大学 | A method of utilizing sulphur coal detoxification chromium slag |
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Open date: 20060628 |