CN101070187A - Chromium-salt clean production process - Google Patents
Chromium-salt clean production process Download PDFInfo
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- CN101070187A CN101070187A CN 200710087038 CN200710087038A CN101070187A CN 101070187 A CN101070187 A CN 101070187A CN 200710087038 CN200710087038 CN 200710087038 CN 200710087038 A CN200710087038 A CN 200710087038A CN 101070187 A CN101070187 A CN 101070187A
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Abstract
The invention discloses a kind of producing craft of chromic salt's cleanness. The invention adopts using waster to manage waster. Reclaim waste water of sodium acid sulfate and regard it as acidulant disposing chromium slag, acidify calcium chromate crystal which is in fusing chromium slag, aluminum residue and acid mud, and make it dissolve into fluid phase, reclaim its liquid to produce pigment of ceram or product of sodium dichromate. Select innoxious acid medicament at the same time, deoxidize hexavalent chromium into trivalent chromium under the acid condition and fix it in the chromium slag, and it discharges chromium slag and waste water innoxiously, simultaneously, dehydrate innoxious waste residue, dry it in the air or dry it in the oven, crush and pack it, we can sell it to cement mill to produce cement or use it as raw material in the production process of concrete, thus, it realises the purpose of cleanness of chromic salt.
Description
Technical field the present invention relates to a kind of chromium-salt clean production process.
Background technology nineteen fifty-two, China quotes Russia has the calcium roasting technology to produce the sodium dichromate 99 product, successively set up 70 surplus manufacturing enterprise of family.Because residual chromium slag contaminated environment can not get handling in the production process, stop to produce or changing the line of production, remain 25 families at present.According to statistics, history store up the chromium slag have 800 surplus ten thousand tons, produce ton surplus the new slag 4000 every day.For handling chromium slag and chromic salts cleaner production, enclose the tame Committee of Development and Reform and State Environmental Protection Administration at promulgation " chromium slag renovation scheme " and the Law of the People's Republic of China on Promoting Clean Production in 2005, the chromic salts industry is also all being improved the chromium salt production mode now, for example lack calcium roasting, calcium-free roasting, liquefaction process production chromic salts, its objective is and reduce chromium slag discharge capacity, reduce content of 6-valence Cr ions in the chromium slag, but there is not thoroughly to handle the technical scheme of chromium slag, sodium pyrosulfate waste water, aluminium mud, sour mud, still there is pollution problem in chromium salt production, does not reach the cleaner production purpose.The objective of the invention is not change original production chromic salts mode, handle chromium slag, sodium pyrosulfate waste water, aluminium mud, sour mud production line, cooperate chromium salt production, reach chromic salts cleaner production purpose by increasing.
Summary of the invention the present invention adopts the treatment of wastes with processes of wastes against one another, and as the souring agent of handling the chromium slag, the yellow ultramarine crystal in acidifying fusion chromium slag, aluminium mud and the sour mud makes it to dissolve in liquid phase, reclaims its liquid production ceramic pigment or sodium dichromate 99 product with the sodium pyrosulfate waste water reclamation.Select nontoxic acid medicine simultaneously for use, and under acidic conditions, hexavalent chrome reduction is become trivalent chromium, be fixed in the chromium slag, reach the chromium slag, waste water does not have the discharging of poisoning, simultaneously nontoxic waste residue is dewatered, dries or dries, pulverizes, packs, and be sold to the cement mill and produce cement or be used as the supplementary material in the production process on the coagulation, realize chromic salts cleaner production purpose.Detailed content is as follows:
(1) waste water is handled in the treatment of wastes with processes of wastes against one another.Contain the acid about 20% in the waste water approximately, be difficult to handle.Technology utilization waste water of the present invention replaces nature water, acid substitution part sulfuric acid in the waste water, yellow ultramarine crystal in the acidifying chromium slag, make it change the liquid phase extraction and application over to, restore detoxifcation, removed secondary pollution and (handled a chromium slag technology treatment of water-soluble sexavalent chrome in the past, the solubility in acid sexavalent chrome is untreated, chromium slag after the processing is brightness reversion once more, secondary pollution occurs), also handled waste water simultaneously.
(2) acidifying chromium slag, turn waste into wealth, handle the chromium slag.Contain magnesium oxide about 28% and about 30% calcium oxide in the chromium slag approximately, heating is expanded, and is the big obstacle that chromium slag for comprehensive utilizes.Process using souring method acidifying chromium slag of the present invention, magnesium oxide in the chromium slag is changed into sal epsom to be lost in the water, calcium oxide changes into calcium sulfate, makes chromium slag ingredient calcium sulfate, aluminum oxide, ferric oxide all become the additive of high-strength cement, can thoroughly utilize the chromium slag.
(3) high-temperature high-pressure craft.Under high-temperature and high-pressure conditions, fully fusion of the yellow ultramarine in the chromium slag changes liquid phase over to, reaches extraction, utilizes chromic optimum efficiency, simultaneously hexavalent chrome reduction is become trivalent chromium to reach thorough toxicide purpose.
Description of drawings is described in further detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
Fig. 1 is the process flow sheet of the specific embodiment of the invention.
Fig. 2 is the processing unit scheme of installation of the specific embodiment of the invention.
1, chromium slag chute car; 2, chromium slag chute car; 3, chromium slag chute car; 4, chromium slag chute car; 5, kettle cover; 6, acidifying pipe; 7, reactor;
8, reduction tube; 9, acidifying medicament; 10 reduction medicaments; 11, kettle cover; 12, track 1; 13, track 2; 14, acidifying medicament;
15, draining; 16, waste water reclamation; 17, wastewater disposal basin 1; 18, wastewater disposal basin 2
Embodiment technology of the present invention is applicable to various chromium salt production factory, and only needing to increase a High Temperature High Pressure immersion equipment in production line chromium slag exit can finish.
1, makes, installs high temperature and high pressure kettle.Require the movable kettle cover in two, interior dress rail Car Track, netted tank, air inlet, water inlet, vacuum lead etc. are selected the steam pressurization of heating for use.
2, build the acidifying medicament, the reduction medicament dissolve conversion unit, waste water reclamation pond, tank car feeding platform.Facility requires impregnating material in the still.
3, production technique:
(1) tank car is filled the chromium slag and advanced still, close kettle cover.The acidifying medicament that will dissolve is simultaneously thrown in the still compressive reaction into.
(2) row pressure is extracted the interior liquid of still out to producing the ceramic pigment workshop, produces ceramic pigment or returns sodium dichromate 99 Workshop Production sodium dichromate 99.
The reduction medicament that (3) will dissolve is thrown in the still compressive reaction into.
(4) liquid in the still is extracted in row pressure out, detects and judges whether allow compliance with emission standards, confirms to do reuse or emission treatment.
(5) open kettle cover and get the slag detection, judge whether allow compliance with emission standards, remake the oven dry comprehensive utilization and handle.
(6) samsara operation.
Claims (4)
1, a kind of chromium-salt clean production process, it is characterized in that: adopt the treatment of wastes with processes of wastes against one another, with the souring agent of sodium pyrosulfate waste water reclamation as processing chromium slag, acidifying fusion chromium slag, yellow ultramarine crystal in aluminium mud and the sour mud, make it to dissolve in liquid phase, reclaim its liquid production ceramic pigment or sodium dichromate 99 product, select nontoxic acid medicine simultaneously for use, and under acidic conditions, hexavalent chrome reduction is become trivalent chromium, be fixed in the chromium slag, reach the chromium slag, waste water does not have the discharging of poisoning, simultaneously with nontoxic waste residue dehydration, dry or dry, pulverize, packing, and be sold to cement mill production cement or, realize chromic salts cleaner production purpose as the supplementary material in the concrete production process.
2, a kind of chromium-salt clean production process according to claim 1, it is characterized in that: utilize waste water to replace nature water, acid substitution part sulfuric acid in the waste water, the yellow ultramarine crystal in the acidifying chromium slag makes it change the liquid phase extraction and application over to, restore detoxifcation, removed secondary pollution (handled a chromium slag technology treatment of water-soluble sexavalent chrome in the past, the solubility in acid sexavalent chrome that is untreated, the chromium slag after the processing is brightness reversion once more, secondary pollution appears), also handled waste water simultaneously.
3, a kind of chromium-salt clean production process according to claim 1, it is characterized in that: adopt souring method acidifying chromium slag, magnesium oxide in the chromium slag is changed into sal epsom to be lost in the water, calcium oxide changes into calcium sulfate, make chromium slag ingredient calcium sulfate, aluminum oxide, ferric oxide all become the additive of high-strength cement, can thoroughly utilize the chromium slag.
4, a kind of chromium-salt clean production process according to claim 1, it is characterized in that: adopt high-temperature and high-pressure conditions, with the abundant fusion of the yellow ultramarine in the chromium slag, change liquid phase over to, reach extraction, utilize chromic optimum efficiency, sexavalent chrome is reduced into trivalent chromium and reaches thorough toxicide purpose simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710087038 CN101070187A (en) | 2007-03-15 | 2007-03-15 | Chromium-salt clean production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710087038 CN101070187A (en) | 2007-03-15 | 2007-03-15 | Chromium-salt clean production process |
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| CN101070187A true CN101070187A (en) | 2007-11-14 |
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| CN 200710087038 Pending CN101070187A (en) | 2007-03-15 | 2007-03-15 | Chromium-salt clean production process |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101863512A (en) * | 2010-04-15 | 2010-10-20 | 彭运林 | Acid method recycling process of chromium-containing aluminum mud |
| CN102189093A (en) * | 2010-03-09 | 2011-09-21 | 刘杰 | Method for detoxicating chromium residues and comprehensive utilization of detoxicated chromium residues |
| CN102320685A (en) * | 2011-05-31 | 2012-01-18 | 重庆民丰化工有限责任公司 | Processing method of sodium bisulfate waste liquid in chromic anhydride preparation process |
| CN101723459B (en) * | 2008-10-27 | 2012-03-07 | 张晓东 | Method for manufacturing ceramic pigment chrome green from waste materials of chromium salt factory |
| CN102862998A (en) * | 2012-09-13 | 2013-01-09 | 四川省安县银河建化（集团）有限公司 | Method for producing sodium hydrogen sulfate and/or hydrate thereof by utilizing side product waste acid residue generated in production of chromic anhydride through sulfuric acid method |
-
2007
- 2007-03-15 CN CN 200710087038 patent/CN101070187A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101723459B (en) * | 2008-10-27 | 2012-03-07 | 张晓东 | Method for manufacturing ceramic pigment chrome green from waste materials of chromium salt factory |
| CN102189093A (en) * | 2010-03-09 | 2011-09-21 | 刘杰 | Method for detoxicating chromium residues and comprehensive utilization of detoxicated chromium residues |
| CN102189093B (en) * | 2010-03-09 | 2015-02-04 | 刘杰 | Method for detoxicating chromium residues and comprehensive utilization of detoxicated chromium residues |
| CN101863512A (en) * | 2010-04-15 | 2010-10-20 | 彭运林 | Acid method recycling process of chromium-containing aluminum mud |
| CN102320685A (en) * | 2011-05-31 | 2012-01-18 | 重庆民丰化工有限责任公司 | Processing method of sodium bisulfate waste liquid in chromic anhydride preparation process |
| CN102862998A (en) * | 2012-09-13 | 2013-01-09 | 四川省安县银河建化（集团）有限公司 | Method for producing sodium hydrogen sulfate and/or hydrate thereof by utilizing side product waste acid residue generated in production of chromic anhydride through sulfuric acid method |
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Open date: 20071114 |