CN104726694A - Sintering prevention vanadium-containing stone coal microwave roasting method - Google Patents
Sintering prevention vanadium-containing stone coal microwave roasting method Download PDFInfo
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- CN104726694A CN104726694A CN201510162381.8A CN201510162381A CN104726694A CN 104726694 A CN104726694 A CN 104726694A CN 201510162381 A CN201510162381 A CN 201510162381A CN 104726694 A CN104726694 A CN 104726694A
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Abstract
The invention relates to a sintering prevention vanadium-containing stone coal microwave roasting method. According to the technical scheme, the method includes: crushing vanadium-containing stone coal into coarse-grained vanadium-containing stone coal with the grain size less than 6mm and greater than 1mm and fine-grained vanadium-containing stone coal with the grain size less than 1mm; adding water to the fine-grained vanadium-containing stone coal to be mixed according to the mass ratio of the fine-grained vanadium-containing stone coal to the water of 1:0.06-0.09 to produce small balls 3-8mm in grain size and drying the small balls; placing the dried small balls in an industrial microwave roasting device as bedding materials, placing the coarse-grained vanadium-containing stone coal on the bedding materials prior to microwave roasting, and cooling to indoor temperature to obtain vanadium-containing stone coal roasting materials, wherein the microwave roasting is characterized in that the temperature rate ranging from 25 DEG C/min to 55 DEG C/min is increased rapidly to the temperature rate ranging from 750 DEG C to 850 DEG C, 25-40 min constant-temperature microwave roasting is performed, and the industrial microwave roasting device is 2400 to 2500 MHz (megahertz) in frequency. With the method, sintering during microwave roasting of the vanadium-containing stone coal is obviously reduced, and the effect of microwave roasting is good.
Description
Technical field
The invention belongs to extracting vanadium from stone coal technical field.Be specifically related to a kind of Rock coal containing alum microwave roasting method of anti-sintered.
Background technology
Rock coal containing alum is that the distinctive one of China is important in vanadium resource, and through the continuous effort of scientific worker and being growing steadily of extracting vanadium from stone coal industry size, extracting vanadium from stone coal has become the very important integral part in vanadium extraction field.Vanadium major part in bone coal is trivalent vanadium, and is often stored in the aluminum silicate such as mica, illite mineral with isomorphous form tax, comparatively stable.Traditional sodium roasting-water logging process for extracting vanadium due to its serious environmental pollution be tending towards at present gradually ripe blank roasting-technique such as acidleach and direct acidleach replace.In aluminium silicate mineral lattice, compose for vanadium rate of depositing high, the class Rock coal containing alum that lower valency content of vanadium is high, acidleach is gone to toward needing to carry out roasting operation, to destroy in advance the lattice containing vanadium minerals as much as possible, alleviates the pressure of follow-up acidleach operation.
Microwave is as a kind of energy of high-efficiency cleaning, more and more deep at the Study and appliance in mining and metallurgy field.Microwave heating technique is just applied in stone coal vanadium-extracting roasting operation and has done preliminary study by part research worker.Due to features such as the heating of microwave heating selectivity, globality heating and high-efficiency heatings, microwave heating can destroy the structure containing vanadium minerals in bone coal more fully, causes roasting sample to obtain higher V leaching rate.But; exactly because also these features of microwave calcining; in the microwave calcining process of actual Rock coal containing alum, often there will be the situation that sintering occurs material, all there is serious impact to the direct motion of Rock coal containing alum microwave calcining process and the V leaching rate of roasting sample in this.
(the Ou Yangguoqiang such as Ou Yangguoqiang, Zhang Xiaoyun, Tian Xueda, Li Yi, Xie Sen. the impact [J] of microwave roasting on vanadium extraction from stone coal. China YouSe Acta Metallurgica Sinica, 2008,18 (4): 750-754.) have studied the impact of microwave roasting on vanadium extraction from stone coal, bone coal after roasting can obtain higher V leaching rate, thinks because microwave calcining selectivity adds thermal property, and " cracking " effect bringing out material particles generation facilitates the lifting of V leaching rate.But do not carry out describing to the Sintering Problem of material in roasting process and processing mode.
(the Yuan Yizhong such as Yuan Yizhong, Zhang Yimin, Chen Tiejun, Liu Tao, Wang Fei, Liu Juan. bone coal classification microwave calcining is to the influence research [J] of vanadium extracting process. rare metal, 2014,38 (3): 534-540) respectively roasting research has been carried out to the Rock coal containing alum of size fractionated, found that the existence of fine fraction bone coal can make material, in microwave calcining process, serious sintering phenomenon occur due to characteristics such as the heating of microwave heating selectivity, overall heating.Carry out the roasting of Rock coal containing alum according to the microwave calcining mode of wholegrain level bone coal in this article, the inventory that sintering occurs can account for more than 30% of total material, and the V leaching rate in roasting material is less than 60%, but does not propose concrete settling mode in literary composition.
In sum, Rock coal containing alum microwave calcining can make Rock coal containing alum obtain higher V leaching rate in leaching operation, but the direct motion that the sintering of material can have a strong impact on Rock coal containing alum microwave calcining process is carried out and roasting effect.And current not one effectively can reduce material sintering, the treatment process of microwave calcining advantageous effects can be given full play to again.
Summary of the invention
The present invention is intended to overcome prior art defect, and object is to provide a kind of Rock coal containing alum microwave roasting method of anti-sintered, and the method significantly can reduce the sintering phenomenon in Rock coal containing alum microwave calcining process, and microwave calcining is effective.
For achieving the above object, the concrete steps of the technical solution used in the present invention are:
Step one, first Rock coal containing alum is crushed to particle diameter and is less than 6mm, be further divided into coarse fraction Rock coal containing alum and fine fraction Rock coal containing alum, the particle diameter of coarse fraction Rock coal containing alum is less than 6mm and is more than or equal to 1mm, and fine fraction Rock coal containing alum particle diameter is less than 1mm.
Step 2, be 1 ︰ 0.06 ~ 0.09 by fine fraction containing the mass ratio of scherbinaite Mei ︰ water, add water mixing in fine fraction Rock coal containing alum, granulates, obtain the bead that particle diameter is 3 ~ 8mm, and drying, obtains dried bead.
Step 3, dried bead is placed in industrial microwave roasting apparatus as grate-layer material, then is placed on grate-layer material by coarse fraction Rock coal containing alum, microwave calcining, is cooled to room temperature, obtains Rock coal containing alum roasting material.
The temperature rise rate of described microwave calcining is 25 ~ 55 DEG C/min, and the temperature of microwave calcining is 750 ~ 850 DEG C, and the time of constant temperature calcining is 25 ~ 40min.
The frequency of described industrial microwave roasting apparatus is 2400 ~ 2500MHz.
Owing to adopting technique scheme, the present invention compared with prior art has following beneficial effect:
1, fine fraction Rock coal containing alum is granulation into particle diameter by the present invention is that the bead of 3 ~ 8mm is as grate-layer material, roasting together with the Rock coal containing alum of 1 ~ 6mm particle diameter, what improve Rock coal containing alum microwave calcining enters stove particle diameter, improve the ventilation property of stockpile, significantly reduce the sintering phenomenon of Rock coal containing alum in microwave calcining process, roasting operation can be carried out smoothly, improve roasting efficiency.
2, the present invention is while control Rock coal containing alum microwave calcining enters stove grade, the temperature rise rate controlling microwave calcining process is 25 ~ 55 DEG C/min, and maturing temperature is 750 ~ 850 DEG C, and the constant temperature calcining time is 25 ~ 40min, can give full play to the advantage of microwave calcining, roasting effect is good.
3, the present invention is in microwave calcining process, and the ratio that the inventory of sintering part accounts for total inventory is less than 3%; The Rock coal containing alum roasting material that the present invention obtains stirs acidleach through constant temperature, and V leaching rate is greater than 80%.
Therefore, the present invention significantly can reduce the sintering phenomenon in Rock coal containing alum microwave calcining process, and microwave calcining is effective.
specific implementation method
Below in conjunction with embodiment, the invention will be further described, the restriction not to its protection domain.
In this embodiment, the frequency of described industrial microwave roasting apparatus is 2400 ~ 2500MHz, repeats no more in embodiment.
embodiment 1
A kind of Rock coal containing alum microwave roasting method of anti-sintered.The concrete steps of described method are:
Step one, first Rock coal containing alum is crushed to particle diameter and is less than 6mm, be further divided into coarse fraction Rock coal containing alum and fine fraction Rock coal containing alum, the particle diameter of coarse fraction Rock coal containing alum is less than 6mm and is more than or equal to 1mm, and fine fraction Rock coal containing alum particle diameter is less than 1mm.
Step 2, be 1 ︰ 0.06 ~ 0.07 by fine fraction containing the mass ratio of scherbinaite Mei ︰ water, add water mixing in fine fraction Rock coal containing alum, granulates, obtain the bead that particle diameter is 3 ~ 8mm, and drying, obtains dried bead.
Step 3, dried bead is placed in industrial microwave roasting apparatus is laid on bottom as grate-layer material, then be placed on grate-layer material by coarse fraction Rock coal containing alum, microwave calcining, is cooled to room temperature, obtains Rock coal containing alum roasting material.
The temperature rise rate of described microwave calcining is 25 ~ 35 DEG C/min, and the temperature of microwave calcining is 750 ~ 780 DEG C, and the time of constant temperature calcining is 25 ~ 30min.
The present embodiment 1 is in microwave calcining process, and the ratio that the inventory of sintering part accounts for total inventory is 0.3 ~ 0.9%; The Rock coal containing alum roasting material that the present embodiment 1 obtains stirs acidleach through constant temperature, and V leaching rate is 80 ~ 85%.
embodiment 2
A kind of Rock coal containing alum microwave roasting method of anti-sintered.The concrete steps of described method are:
Step one, first Rock coal containing alum is crushed to particle diameter and is less than 6mm, be further divided into coarse fraction Rock coal containing alum and fine fraction Rock coal containing alum, the particle diameter of coarse fraction Rock coal containing alum is less than 6mm and is more than or equal to 1mm, and fine fraction Rock coal containing alum particle diameter is less than 1mm.
Step 2, be 1 ︰ 0.07 ~ 0.08 by fine fraction containing the mass ratio of scherbinaite Mei ︰ water, add water mixing in fine fraction Rock coal containing alum, granulates, obtain the bead that particle diameter is 3 ~ 5mm, and drying, obtains dried bead.
Step 3, dried bead is placed in industrial microwave roasting apparatus is laid on bottom as grate-layer material, then be placed on grate-layer material by coarse fraction Rock coal containing alum, microwave calcining, is cooled to room temperature, obtains Rock coal containing alum roasting material.
The temperature rise rate of described microwave calcining is 35 ~ 45 DEG C/min, and the temperature of microwave calcining is 780 ~ 820 DEG C, and the time of constant temperature calcining is 30 ~ 35min.
The present embodiment 2 is in microwave calcining process, and the ratio that the material of sintering part accounts for total inventory is 0.8 ~ 2.3%; The Rock coal containing alum roasting material that the present embodiment 2 obtains stirs acidleach through constant temperature, and V leaching rate is 84 ~ 88%.
embodiment 3
A kind of Rock coal containing alum microwave roasting method of anti-sintered.The concrete steps of described method are:
Step one, first Rock coal containing alum is crushed to particle diameter and is less than 6mm, be further divided into coarse fraction Rock coal containing alum and fine fraction Rock coal containing alum, the particle diameter of coarse fraction Rock coal containing alum is less than 6mm and is more than or equal to 1mm, and fine fraction Rock coal containing alum particle diameter is less than 1mm.
Step 2, be 1 ︰ 0.08 ~ 0.09 by fine fraction containing the mass ratio of scherbinaite Mei ︰ water, add water mixing in fine fraction Rock coal containing alum, granulates, obtain the bead that particle diameter is 5 ~ 8mm, and drying, obtains dried bead.
Step 3, dried bead is placed in industrial microwave roasting apparatus is laid on bottom as grate-layer material, then be placed on grate-layer material by coarse fraction Rock coal containing alum, microwave calcining, is cooled to room temperature, obtains Rock coal containing alum roasting material.
The temperature rise rate of described microwave calcining is 45 ~ 55 DEG C/min, and the temperature of microwave calcining is 820 ~ 850 DEG C, and the time of constant temperature calcining is 35 ~ 40min.
The present embodiment 3 is in microwave calcining process, and the ratio that the inventory of sintering part accounts for total inventory is 2 ~ 2.6%; The Rock coal containing alum roasting material that the present embodiment 3 obtains stirs acidleach through constant temperature, and V leaching rate is 81 ~ 85%.
This embodiment compared with prior art has following beneficial effect:
1, fine fraction Rock coal containing alum is granulation into particle diameter by this embodiment is that the bead of 3 ~ 8mm is as grate-layer material, roasting together with the Rock coal containing alum of 1 ~ 6mm particle diameter, what improve Rock coal containing alum microwave calcining enters stove particle diameter, improve the ventilation property of stockpile, significantly reduce the sintering phenomenon of Rock coal containing alum in microwave calcining process, roasting operation can be carried out smoothly, improve roasting efficiency.
2, this embodiment is while control Rock coal containing alum microwave calcining enters stove grade, the temperature rise rate controlling microwave calcining process is 25 ~ 55 DEG C/min, and maturing temperature is 750 ~ 850 DEG C, and the constant temperature calcining time is 25 ~ 40min, can give full play to the advantage of microwave calcining, roasting effect is good.
3, this embodiment is in microwave calcining process, and the ratio that the inventory of sintering part accounts for total inventory is less than 3%; The Rock coal containing alum roasting material that this embodiment obtains stirs acidleach through constant temperature, and V leaching rate is greater than 80%.
Therefore, this embodiment significantly can reduce the sintering phenomenon in Rock coal containing alum microwave calcining process, and microwave calcining is effective.
Claims (3)
1. a Rock coal containing alum microwave roasting method for anti-sintered, is characterized in that the concrete steps of described method are:
Step one, first Rock coal containing alum is crushed to particle diameter and is less than 6mm, be further divided into coarse fraction Rock coal containing alum and fine fraction Rock coal containing alum, the particle diameter of coarse fraction Rock coal containing alum is less than 6mm and is more than or equal to 1mm, and fine fraction Rock coal containing alum particle diameter is less than 1mm;
Step 2, be 1 ︰ 0.06 ~ 0.09 by fine fraction containing the mass ratio of scherbinaite Mei ︰ water, add water mixing in fine fraction Rock coal containing alum, granulates, obtain the bead that particle diameter is 3 ~ 8mm, and drying, obtains dried bead;
Step 3, dried bead is placed in industrial microwave roasting apparatus as grate-layer material, then is placed on grate-layer material by coarse fraction Rock coal containing alum, microwave calcining, is cooled to room temperature, obtains Rock coal containing alum roasting material.
2. the Rock coal containing alum microwave roasting method of anti-sintered according to claim 1, is characterized in that the temperature rise rate of described microwave calcining is 25 ~ 55 DEG C/min, and the temperature of microwave calcining is 750 ~ 850 DEG C, and the time of constant temperature calcining is 25 ~ 40min.
3. the Rock coal containing alum microwave roasting method of anti-sintered according to claim 1, is characterized in that the frequency of described industrial microwave roasting apparatus is 2400 ~ 2500MHz.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105331810A (en) * | 2015-10-13 | 2016-02-17 | 长沙矿冶研究院有限责任公司 | Microwave heating device and method for leaching vanadium from stone coal through sulfuric acid |
| CN115710632A (en) * | 2022-11-22 | 2023-02-24 | 东北大学 | Method for extracting vanadium from high-carbon stone coal through step-by-step microwave roasting-ultrasonic microbubble acid leaching |
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| CN101012496A (en) * | 2007-02-08 | 2007-08-08 | 中南大学 | Method for extracting vanadium pentoxide from stone coal |
| CN104099484A (en) * | 2014-07-31 | 2014-10-15 | 武汉科技大学 | Method for extracting vanadium by roasting vanadium-containing stone coal in size fraction grading and fluidization manner |
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2015
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| CN101012496A (en) * | 2007-02-08 | 2007-08-08 | 中南大学 | Method for extracting vanadium pentoxide from stone coal |
| CN104099484A (en) * | 2014-07-31 | 2014-10-15 | 武汉科技大学 | Method for extracting vanadium by roasting vanadium-containing stone coal in size fraction grading and fluidization manner |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105331810A (en) * | 2015-10-13 | 2016-02-17 | 长沙矿冶研究院有限责任公司 | Microwave heating device and method for leaching vanadium from stone coal through sulfuric acid |
| CN105331810B (en) * | 2015-10-13 | 2017-09-12 | 长沙矿冶研究院有限责任公司 | Microwave heating equipment and method for vanadium in sulfuric acid leaching bone coal |
| CN115710632A (en) * | 2022-11-22 | 2023-02-24 | 东北大学 | Method for extracting vanadium from high-carbon stone coal through step-by-step microwave roasting-ultrasonic microbubble acid leaching |
| CN115710632B (en) * | 2022-11-22 | 2024-06-11 | 东北大学 | Method for extracting vanadium from high-carbon stone coal by step microwave roasting-ultrasonic micro-bubble acid leaching |
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