CN103789533A - Process for treating iron vanadium slag by virtue of dry-process rotary kiln - Google Patents
Process for treating iron vanadium slag by virtue of dry-process rotary kiln Download PDFInfo
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- CN103789533A CN103789533A CN201410047260.4A CN201410047260A CN103789533A CN 103789533 A CN103789533 A CN 103789533A CN 201410047260 A CN201410047260 A CN 201410047260A CN 103789533 A CN103789533 A CN 103789533A
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Abstract
The invention discloses a process for treating iron vanadium slag by virtue of a dry-process rotary kiln. The process comprises the following steps: breaking the iron vanadium slag, and feeding into a rotary dryer for drying to obtain tail gas with ammonium carbonate, wherein drying hot air is hot air at the tail of the dry-process rotary kiln; grinding deaminized iron vanadium slag, adding a bonder and water, feeding into a multistage cyclone treatment device, and desulfurizing to obtain iron oxide and tail gas; feeding the tail gas generated by the desulfurization of the iron vanadium slag into a sulfuric acid workshop to produce sulfuric acid; washing the iron oxide, recovering valuable metals, and taking the washed iron oxide as a steelmaking material. According to the process, all heat sources are residual heat of the dry-process rotary kiln, so that the economic and environment-friendly benefits are remarkable.
Description
Technical field
The present invention relates to the treatment process of the harmful waste residue of a kind of metallurgy industry.
Background technology
Nearly ten years, the plumbous zinc metallurgy of China has kept the impetus of rapid growth, and 2010, plumbous zinc ultimate production reached 958.1 ten thousand tons.For the wet processing Sheng electricity zinc factory that produces 100000 tons per year, if zinc ore concentrate iron content is in 8%, the ammonium jarosite slag (abbreviation iron vitriol slag) of annual output is about 5.3 ten thousand tons of [Chen Yongmings, Tang Motang, the interim state non-ferrous metal journal Yang Sheng of the 19th volume the 7th sea etc., NaOH decomposes containing indium iron vitriol slag novel process [J], China YouSe Acta Metallurgica Sinica, 2009,19(7): 1322-1331].China's plumbous zinc metal output occupies the first in the world for years.In the develop rapidly of product production capacity, the processing problem of the ammonium jarosite slag in production process progressively shows especially, is not only related to the comprehensive cyclic utilization of resource, and is more related to the impact on physical environment.
At present, the method for iron vitriol slag processing is mainly and adopts high-temperature calcination and alkali decomposition additive processing, the complex process of alkaline cleaning, the waste residue obtaining, waste liquid to be difficult to process.High-temperature calcination technique is simple, produces without waste residue, waste gas, waste liquid.
Iron vitriol slag high-temperature calcination processing is mainly and adopts rotary kiln heating and calcining, according to the thermal properties of ammonium jarosite, in heat temperature raising process, thermolysis occurs, the product difference that differing temps is decomposed; At 290-479 ℃, the intermediate product that the product of decomposition is ferric oxide and ammonia; More than 650 ℃, obtain ferric oxide and sulfur oxide final decomposition, and reaction formula is as follows:
[hot acid leaches the treatment process [J] of iron vitriol slag in zinc hydrometallurgy, Hunan non-ferrous metal, 1994,10(3 for Qiu electricity Yun, Ma Rongjun): 158-162].Though the recyclable ferric oxide of existing method and sulfur oxide, need external energy to heat iron vitriol slag, separating of ammonia and sulfur oxide is more difficult, is unfavorable for reclaiming.Thin (m), in the time that desulfurization is processed, due to further deviating from of sulphur and water, the viscosifying power of crystal grain and crystal grain weakens 1-10 μ the crystal grain of iron vitriol slag, will obtain thinner powder, is unfavorable for separating of gas after desulfurization and solid in addition.
Summary of the invention
The object of this invention is to provide a kind for the treatment of process of iron vitriol slag of energy-saving and environmental protection.
For reaching above object, the present invention takes following technical scheme to be achieved:
A technique of utilizing dry-process rotory kiln Heat Treatment iron vitriol slag, is characterized in that, comprises the steps:
(1) deamination processing
By after iron vitriol slag fragmentation, send into rotary dryer dry, desiccant hot blast is the hot blast of dry-process rotory kiln kiln tail, hot blast temperature is controlled at 300 ℃, obtains tail gas and deamination iron vitriol slag containing volatile salt;
(2) desulfurization processing
After deamination iron vitriol slag is pulverized, add binding agent and water, after mixing, be prepared into particle diameter and be the bead of 1 millimeter, the temperature of utilizing dry-process rotory kiln is three hot blasts of 900 ℃, in multistage cyclone cylinder treater, carries out desulfurization processing, obtains ferric oxide and containing SO
2tail gas, wherein, binding agent is the one in silicon sol, aluminium colloidal sol, bauxitic clay, kaolinite, illite, montmorillonite, add-on is the 5-10% of deamination iron vitriol slag weight; The add-on of water is 30% of deamination iron vitriol slag weight;
(3) desulfurization is processed to the SO that contains producing
2tail gas, send into sulfuric acid plant produce sulfuric acid; Ferric oxide, after washing, is reclaimed to valuable metal, and the ferric oxide after washing is as steelmaking feed.
In aforesaid method, described multistage cyclone cylinder treater is three grades of cyclone cylinder treaters, and it is as follows that concrete steps are processed in desulfurization:
A, the course of deamination iron vitriol slag bead in cyclone cylinder treater are: pass through charging opening, enter the venting port of secondary rotary air duct, be brought into one-level cyclone cylinder, the inwall of encountering one-level cyclone cylinder falls, enter the venting port of three grades of cyclone cylinders, be brought into secondary rotary air duct, the inwall of encountering secondary rotary air duct falls, and is brought into three grades of cyclone cylinders by the wind of tertiary air entrance, the inwall of encountering three grades of cyclone cylinders falls, enter cooling room, finally by the rotation of capstan head, discharge from discharge port;
The moving line of b, gas is: hot blast enters three grades of cyclone cylinders by tertiary air entrance, through the vapor pipe on three grades of cyclone cylinder tops, enter secondary rotary air duct, enter one-level cyclone cylinder through the vapor pipe on secondary rotary air duct top, enter discharge through the vapor pipe on one-level cyclone cylinder top; Enter the hot blast of three grades of cyclone cylinders by tertiary air entrance, produce a negative pressure at the top of cooling room, freezing air is sucked from discharge port, carry out cooling to slag.
The bottom of described cyclone cylinders at different levels is provided with tightness system, and solid can move downward, and gas can not move up or down.
Step (1) gained is carried out to gas containing the tail gas of volatile salt and separate with volatile salt, the volatile salt obtaining is sent into spelter works's recycle, gas qualified discharge.
The washing of described step (3) adopts dilute sulphuric acid washing, and washings enters in the leach liquor of zinc smelting.
Compared with prior art, thermal source of the present invention adopts the waste heat of dry-process rotory kiln, and the hot blast of dry-process rotory kiln kiln tail is dried iron vitriol slag, and rotary kiln tail gas contains a large amount of CO
2, CO
2decompose with iron vitriol slag the ammonia gas react producing, obtain volatile salt, be conducive to recovery and the storage of ammonia, also recyclable valuable sulphur and ferric oxide simultaneously, therefore, technique of the present invention has significant economic benefit and environmental benefit.In addition, the present invention adds binding agent in deamination iron vitriol slag after treatment, be prepared into particle diameter and be the bead of 1 millimeter, the temperature of utilizing dry-process rotory kiln is three hot blasts of 900 ℃, in multistage cyclone cylinder treater, carry out desulfurization processing, be conducive to separating of gas and solid, further reduce the dedusting cost of tail gas.
Accompanying drawing explanation
Fig. 1 is that cyclone cylinder processor structure schematic diagram used is processed in desulfurization of the present invention.In figure: 1, capstan head; 2, discharge port; 3, cooling room; 4, three grades of cyclone cylinders; 5, tertiary air entrance; 6, secondary rotary air duct; 7, charging opening; 8, one-level cyclone cylinder; 9, venting port.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
A technique of utilizing dry-process rotory kiln Heat Treatment iron vitriol slag, comprises the steps:
(1) iron vitriol slag deamination processing
By after iron vitriol slag fragmentation, send into rotary dryer dry, desiccant hot blast is the hot blast of dry-process rotory kiln kiln tail, hot blast temperature is controlled at 300 ℃, obtains the tail gas containing volatile salt; Gas obtains volatile salt after separating with volatile salt, sends into spelter works's recycle, gas qualified discharge.
(2) the desulfurization processing of iron vitriol slag
To pulverize through deamination iron vitriol slag after treatment, add binding agent and water (formula is referring to table 1), after mixing, be prepared into particle diameter and be the bead of 1 millimeter, and join in the cyclone cylinder treater of Fig. 1 and carry out desulfurization processing, obtain ferric oxide and tail gas.
(3) desulfurization of iron vitriol slag is processed to the tail gas producing, send into sulfuric acid plant and produce sulfuric acid; Ferric oxide, after dilute sulphuric acid washing, is reclaimed to valuable metal, and the ferric oxide after washing is as steelmaking feed; Washings enters in the leach liquor of zinc smelting.
Desulfurization is processed concrete technology referring to Fig. 1, a, deamination iron vitriol slag after treatment at the moving line of cyclone cylinder treater are: the venting port that enters secondary rotary air duct 6 by charging opening 7, be brought into one-level cyclone cylinder 8, the inwall of encountering cyclone cylinder 8 falls, enter the venting port of three grades of cyclone cylinders 4, be brought into secondary rotary air duct 6, the inwall of encountering cyclone cylinder 6 falls, brought into cyclone cylinder 4 by the wind of tertiary air entrance 5, the inwall of encountering cyclone cylinder 4 falls, enter cooling room 3, slag, by the rotation of capstan head 1, is discharged from discharge port 2.The hot blast of tertiary air entrance 5 is the tertiary air of dry-process rotory kiln, and temperature in is 900 degree.Bottom at cyclone cylinders at different levels is provided with tightness system, and slag can move downward, and gas can not move up or down.The moving line of b, gas is: hot blast, by tertiary air entrance 5, enters cyclone cylinder 4, through the vapor pipe on cyclone cylinder 4 tops, enters cyclone cylinder 6, enters cyclone cylinder 8 through the vapor pipe on cyclone cylinder 6 tops, enters venting port 9 through the vapor pipe on cyclone cylinder 8 tops.Enter the hot blast of cyclone cylinder 4 by tertiary air entrance 5, produce a negative pressure at the top of cooling room 3, freezing air is sucked from discharge port 2, carry out cooling to slag.
Table 1
Claims (5)
1. a technique of utilizing dry-process rotory kiln Heat Treatment iron vitriol slag, is characterized in that, comprises the steps:
(1) deamination processing
By after iron vitriol slag fragmentation, send into rotary dryer dry, desiccant hot blast is the hot blast of dry-process rotory kiln kiln tail, hot blast temperature is controlled at 300 ℃, obtains tail gas and deamination iron vitriol slag containing volatile salt;
(2) desulfurization processing
After deamination iron vitriol slag is pulverized, add binding agent and water, after mixing, be prepared into particle diameter and be the bead of 1 millimeter, the temperature of utilizing dry-process rotory kiln is three hot blasts of 900 ℃, in multistage cyclone cylinder treater, carries out desulfurization processing, obtains ferric oxide and containing SO
2tail gas, wherein, binding agent is the one in silicon sol, aluminium colloidal sol, bauxitic clay, kaolinite, illite, montmorillonite, add-on is the 5-10% of deamination iron vitriol slag weight; The add-on of water is 30% of deamination iron vitriol slag weight;
(3) desulfurization is processed to the SO that contains producing
2tail gas, send into sulfuric acid plant produce sulfuric acid; Ferric oxide, after washing, is reclaimed to valuable metal, and the ferric oxide after washing is as steelmaking feed.
2. the technique of utilizing dry-process rotory kiln Heat Treatment iron vitriol slag as claimed in claim 1, is characterized in that, described multistage cyclone cylinder treater is three grades of cyclone cylinder treaters, and it is as follows that concrete steps are processed in desulfurization:
A, the course of deamination iron vitriol slag bead in cyclone cylinder treater are: pass through charging opening, enter the venting port of secondary rotary air duct, be brought into one-level cyclone cylinder, the inwall of encountering one-level cyclone cylinder falls, enter the venting port of three grades of cyclone cylinders, be brought into secondary rotary air duct, the inwall of encountering secondary rotary air duct falls, and is brought into three grades of cyclone cylinders by the wind of tertiary air entrance, the inwall of encountering three grades of cyclone cylinders falls, enter cooling room, finally by the rotation of capstan head, discharge from discharge port;
The moving line of b, gas is: hot blast enters three grades of cyclone cylinders by tertiary air entrance, through the vapor pipe on three grades of cyclone cylinder tops, enter secondary rotary air duct, enter one-level cyclone cylinder through the vapor pipe on secondary rotary air duct top, enter discharge through the vapor pipe on one-level cyclone cylinder top; Enter the hot blast of three grades of cyclone cylinders by tertiary air entrance, produce a negative pressure at the top of cooling room, freezing air is sucked from discharge port, carry out cooling to slag.
3. the technique of utilizing dry-process rotory kiln Heat Treatment iron vitriol slag as claimed in claim 2, is characterized in that, is provided with tightness system in the bottom of cyclone cylinders at different levels, and solid can move downward, and gas can not move up or down.
4. the technique of utilizing dry-process rotory kiln Heat Treatment iron vitriol slag as claimed in claim 1, it is characterized in that, step (1) gained is carried out to gas containing the tail gas of volatile salt and separate with volatile salt, the volatile salt obtaining is sent into spelter works's recycle, gas qualified discharge.
5. the technique of utilizing dry-process rotory kiln Heat Treatment iron vitriol slag as claimed in claim 1, is characterized in that, the washing of described step (3) adopts dilute sulphuric acid washing, and washings enters in the leach liquor of zinc smelting.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106865504A (en) * | 2017-01-09 | 2017-06-20 | 西南科技大学 | A kind of method for reclaiming high concentration sulfur oxide gas |
| CN107324358A (en) * | 2017-06-20 | 2017-11-07 | 谭宏斌 | A kind of iron vitriol slag low-temperature decomposition and the method that resource is separately recovered |
| CN107840311A (en) * | 2017-11-15 | 2018-03-27 | 西南科技大学 | A kind of method of containing sulphur-slag recovery sulphur |
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| CN1340456A (en) * | 2000-09-01 | 2002-03-20 | 山东鲁北企业集团总公司 | Process and equipment for decomposing gypsum |
| CN101456690A (en) * | 2009-01-07 | 2009-06-17 | 中国建筑材料科学研究总院 | Method and system for preparing active coal gangue |
| CN202081023U (en) * | 2011-05-13 | 2011-12-21 | 高玉宗 | Cyclone preheater |
| CN103411424A (en) * | 2013-07-29 | 2013-11-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Powdery material heating device and method |
| CN103523832A (en) * | 2013-09-04 | 2014-01-22 | 陕西理工学院 | Process for recovering sulfur from ammoniojarosite |
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2014
- 2014-02-11 CN CN201410047260.4A patent/CN103789533B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1340456A (en) * | 2000-09-01 | 2002-03-20 | 山东鲁北企业集团总公司 | Process and equipment for decomposing gypsum |
| CN101456690A (en) * | 2009-01-07 | 2009-06-17 | 中国建筑材料科学研究总院 | Method and system for preparing active coal gangue |
| CN202081023U (en) * | 2011-05-13 | 2011-12-21 | 高玉宗 | Cyclone preheater |
| CN103411424A (en) * | 2013-07-29 | 2013-11-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Powdery material heating device and method |
| CN103523832A (en) * | 2013-09-04 | 2014-01-22 | 陕西理工学院 | Process for recovering sulfur from ammoniojarosite |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106865504A (en) * | 2017-01-09 | 2017-06-20 | 西南科技大学 | A kind of method for reclaiming high concentration sulfur oxide gas |
| CN106865504B (en) * | 2017-01-09 | 2018-12-28 | 西南科技大学 | A method of recycling high concentration sulfur oxide gas |
| CN107324358A (en) * | 2017-06-20 | 2017-11-07 | 谭宏斌 | A kind of iron vitriol slag low-temperature decomposition and the method that resource is separately recovered |
| CN107324358B (en) * | 2017-06-20 | 2019-03-12 | 谭宏斌 | A kind of iron vitriol slag low-temperature decomposition and the method that resource is separately recovered |
| CN107840311A (en) * | 2017-11-15 | 2018-03-27 | 西南科技大学 | A kind of method of containing sulphur-slag recovery sulphur |
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