CN1799712A - Detoxification method of chromium slag in production of sulfuric acid - Google Patents
Detoxification method of chromium slag in production of sulfuric acid Download PDFInfo
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- CN1799712A CN1799712A CN 200510020130 CN200510020130A CN1799712A CN 1799712 A CN1799712 A CN 1799712A CN 200510020130 CN200510020130 CN 200510020130 CN 200510020130 A CN200510020130 A CN 200510020130A CN 1799712 A CN1799712 A CN 1799712A
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- chromium
- slag
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- chromium slag
- troilite
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Abstract
The invention relates to a detoxification method of chromic slag in the process of producing vitriol with ebullition furnace. It mixes the chromic slag and ferro-sulphur ore as raw material to be baked in the ebullition furnace while the baking temperature is controlled between 600-900Deg. C, and the mixing weight rate between ferro-sulphur ore and chromic slag is 100:0.1-300. In the baking process, the sulfur dioxide generated by ferro-sulphur ore can fully deoxidize the hexavalent chromium of chromic slag to remove the toxin (water soluble chromium and acid soluble chromium) in the chromic slag. The invention can realize detoxification of chromic slag without affecting the production and quality of vitriol, and the generated vitriol slag can be used as cement mixing material to avoid secondary pollution.
Description
Affiliated technical field:
The present invention be in gas washing in SA production to the method for chromium residue detoxifying, particularly adopt fluidized bed furnace to produce to separate in the sulfuric acid method of water-soluble Cr VI and the insoluble calcium chromate of water in the dechromisation slag.
Background technology:
Most of with calcareous filler in the current chromium salt production, as lime stone, the same chromite of dolomite, 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 arsenic per ton is received and produced chromium slag 2-2.5 ton.Owing to contain Cr VI in the chromium slag, up to 2-3% (chromium trioxide juice), 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 or utilize, as not removing toxin (the insoluble calcium chromate of water-soluble Cr VI and water) wherein, will cause great threat and destruction to human and environment.At present chromium residue detoxifying is the most frequently used two kinds of methods, 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 kind 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, provide a kind of fluidized bed furnace that utilizes to produce in the sulfuric acid process, the chromium slag is carried out method for detoxification, can separate the insoluble calcium chromate of water-soluble Cr VI in the dechromisation slag more completely with water.
Solution of the present invention is:
A kind of in gas washing in SA production to the method for chromium residue detoxifying, it is characterized in that the chromium slag mixed with troilite as furnace charge and in fluidized bed furnace, carry out roasting, sintering temperature is controlled at 600 ℃-900 ℃, troilite is 100 with chromium slag mixed weight ratio: 0.1-300.The present invention utilizes the Cr VI (water-soluble chromium and sour molten chromium) in the abundant reduced chromium slag of sulfur dioxide that pyrite burning produces, and makes Cr VI can obtain reducing more completely.Sulfate slag that produces in the roasting and the chromium slag that is reduced can be used as cement admixture, non-secondary pollution.Simultaneously, being mixed into the chromium slag in troilite does not influence the production and the quality of sulfuric acid yet, sulfur dioxide gas is through Venturi scrubbing, the ferro-aluminum silicon magnesium and the insoluble trivalent chromium that only contain trace in the gas, can vanadium pentoxide catalyst that make carrier with diatomite not exerted an influence, the absorption of Sulphur Dioxide and sulfur trioxide is normally carried out.
Chromium slag addition can be infinitely small in the solution of the present invention, but addition the processing speed of chromium slag is too slow very little; The addition of chromium slag be troilite more than three times the time, might cause that fluidized bed furnace is flame-out.Troilite is 100 with chromium slag mixed weight ratio: the 1-20 effect is best.Mix with troilite and fully reaction for ease of the chromium slag in the solution of the present invention, the fineness of chromium slag can be 0.01-20mm.
The present invention is adopting fluidized bed furnace to produce in the sulfuric acid, the chromium slag mixed as furnace charge with troilite carry out roasting, the sulfur dioxide that produces under 600 ℃ of-900 ℃ of conditions can be separated the toxin in the dechromisation slag than the Cr VI in the sufficient reduced chromium slag, does not influence the production and the quality of sulfuric acid simultaneously.The sulfate slag that the reaction back produces can be used as cement admixture, non-secondary pollution.
The present invention can further specify in conjunction with the embodiments
Embodiment 1: a kind of in gas washing in SA production to the method for chromium residue detoxifying, chromium slag breeze is broken to 80 orders, and the ratio adding chromium slag mixing in troilite 5% (percentage by weight) enters roasting in the φ 5m fluidized bed furnace, temperature is 700-800 ℃ in the control stove, and the control feeding coal is 5 tons/hour.After testing, non-hexavalent chromium and acid solution in the sulfate slag, non-hexavalent chromium in the sulfuric acid, non-hexavalent chromium in the waste water, the insoluble trivalent chromium of water is 0.4ppm in the sulfuric acid.
Embodiment 2: the chromium ground-slag is broken to 100 orders, presses troilite 8% (percentage by weight) and add chromium slag mixing, enter roasting in the φ 6m fluidized bed furnace, temperature is 800-900 ℃ in the control stove, and the control feeding coal is 5.5 tons/hour.After testing, non-hexavalent chromium and acid solution in the sulfate slag, non-hexavalent chromium in the waste water, the insoluble trivalent chromium of water is 0.5ppm in the sulfuric acid.
Claims (3)
1, a kind of in gas washing in SA production to the method for chromium residue detoxifying, it is characterized in that the chromium slag mixed with troilite as furnace charge and in fluidized bed furnace, carry out roasting, sintering temperature is controlled at 600 ℃-900 ℃, troilite is 100 with chromium slag mixed weight ratio: 0.1-300.
2, according to claim 1 in gas washing in SA production to the method for chromium residue detoxifying, it is characterized in that troilite and chromium slag mixed weight ratio are 100: 1-20.
3, according to claim 1 and 2 in troilite is produced to the method for chromium residue detoxifying, the fineness that it is characterized in that the chromium slag is 0.01-20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510020130 CN1799712A (en) | 2005-01-07 | 2005-01-07 | Detoxification method of chromium slag in production of sulfuric acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510020130 CN1799712A (en) | 2005-01-07 | 2005-01-07 | Detoxification method of chromium slag in production of sulfuric acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1799712A true CN1799712A (en) | 2006-07-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510020130 Pending CN1799712A (en) | 2005-01-07 | 2005-01-07 | Detoxification method of chromium slag in production of sulfuric acid |
Country Status (1)
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| CN (1) | CN1799712A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102887544A (en) * | 2012-09-13 | 2013-01-23 | 四川省安县银河建化（集团）有限公司 | Method for heating and detoxifying hexavalent chromium by utilizing electric heating tube and application for method |
| CN111437561A (en) * | 2020-04-08 | 2020-07-24 | 北京高能时代环境技术股份有限公司 | Chromium slag wet detoxification method based on mechanochemical strengthening |
-
2005
- 2005-01-07 CN CN 200510020130 patent/CN1799712A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102887544A (en) * | 2012-09-13 | 2013-01-23 | 四川省安县银河建化（集团）有限公司 | Method for heating and detoxifying hexavalent chromium by utilizing electric heating tube and application for method |
| CN111437561A (en) * | 2020-04-08 | 2020-07-24 | 北京高能时代环境技术股份有限公司 | Chromium slag wet detoxification method based on mechanochemical strengthening |
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