CN1792479A - Process for detoxicating chrome slag by sulfur - Google Patents
Process for detoxicating chrome slag by sulfur Download PDFInfo
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- CN1792479A CN1792479A CN 200610000013 CN200610000013A CN1792479A CN 1792479 A CN1792479 A CN 1792479A CN 200610000013 CN200610000013 CN 200610000013 CN 200610000013 A CN200610000013 A CN 200610000013A CN 1792479 A CN1792479 A CN 1792479A
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- Prior art keywords
- chromium
- slag
- sulphur
- chromium slag
- sulfur
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Abstract
A process for detoxicating Cr slag by sulfur includes such steps as mixing Cr slag with sulfur in boiling furnace, 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 relates to a kind of sulphur that utilizes to the chromium residue detoxifying method, enter the method that boiling roaster is separated water-soluble sexavalence and the insoluble calcium chromate of water in the dechromisation slag after particularly sulphur and chromium slag being mixed.
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; Report was also once arranged, and the chromium slag detoxifies with the coal roasting reduction in rotary kiln; In addition, the sulphur-fixing agent of employing chromium slag as fire coal disclosed among the CN1071373C.Because have defective on the said method technology, 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.
Therefore, still just need better chromium residue detoxifying method.
Summary of the invention
The objective of the invention is to overcome above-mentioned prior art deficiency, a kind of method of utilizing sulphur to chromium residue detoxifying is provided.This method can be separated the insoluble calcium chromate with water of water-soluble Cr VI in the dechromisation slag more completely.
Solution of the present invention is:
To enter boiling roaster after sulphur and the mixing of chromium slag, thereby the chromium slag is detoxified.
The present invention utilizes sulphur when the boiling kiln roasting, and sintering temperature is 500 ℃～1000 ℃, and the Cr VI in the abundant reduced chromium slag of the sulfur dioxide of generation (water-soluble chromium and sour molten chromium) makes Cr VI can obtain reducing more completely.The slag that produces in the roasting can be used as the admixture in the manufacture of cement, and the tail gas that roasting produces is used for the raw material of gas washing in SA production.Non-secondary pollution.
The addition of sulphur is the 10%-99.9% of the compound gross weight of chromium slag and sulphur composition in the solution of the present invention, is preferably 20%-80%.Sulphur is oxidized to SO in fluidized bed furnace
2, SO
2With Cr
6+Be reduced into Cr
3+Thereby, the toxicity of separating the dechromisation slag.Certainly, the addition of sulphur can be infinity among the present invention, the production material SO of main production this moment sulfuric acid
2, chromium residue detoxifying is less important.
The fineness of sulphur is 0.01～20mm among the present invention, is preferably 0.1-10mm.The fineness of chromium slag is 0.01～20mm, is preferably 0.1-10mm.
Embodiment 1:
A, with 30kg chromium slag, 70kg sulphur, fineness is 5mm, adds the boiling kiln roasting, the fluidized bed furnace temperature is controlled to be 700～800 ℃.
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, 60kg sulphur, fineness is 5mm, adds the boiling kiln roasting, the fluidized bed furnace temperature is controlled to be 700～800 ℃.
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, 40kg sulphur, fineness is 5mm, adds the boiling kiln roasting, the fluidized bed furnace temperature is controlled to be 700～800 ℃.
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 (5)
1, a kind of method of utilizing sulphur to chromium residue detoxifying is characterized in that the chromium slag is mixed the back with sulphur carry out roasting in fluidized bed furnace, and sintering temperature is controlled at 500～1000 ℃.
2, method according to claim 1 is characterized in that the addition of sulphur in the compound of chromium slag and sulphur is 10%～99.9% of a mixture total weight amount.
3, method according to claim 1 and 2, the granularity that it is characterized in that sulphur is 0.01～20mm.
4, according to arbitrary method of claim 1-3, the fineness that it is characterized in that the chromium slag is 0.01～20mm.
5,, it is characterized in that the fineness of sulphur and chromium slag is 0.1-10mm according to the method for claim 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610000013 CN1792479A (en) | 2006-01-04 | 2006-01-04 | Process for detoxicating chrome slag by sulfur |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610000013 CN1792479A (en) | 2006-01-04 | 2006-01-04 | Process for detoxicating chrome slag by sulfur |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1792479A true CN1792479A (en) | 2006-06-28 |
Family
ID=36804242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610000013 Pending CN1792479A (en) | 2006-01-04 | 2006-01-04 | Process for detoxicating chrome slag by sulfur |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1792479A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103765157A (en) * | 2011-07-04 | 2014-04-30 | 科磊股份有限公司 | Atmospheric molecular contamination control with local purging |
-
2006
- 2006-01-04 CN CN 200610000013 patent/CN1792479A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103765157A (en) * | 2011-07-04 | 2014-04-30 | 科磊股份有限公司 | Atmospheric molecular contamination control with local purging |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20060628 |