CN1176230C - Process for calcining molybdenum ore concentrate - Google Patents
Process for calcining molybdenum ore concentrate Download PDFInfo
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- CN1176230C CN1176230C CNB021237913A CN02123791A CN1176230C CN 1176230 C CN1176230 C CN 1176230C CN B021237913 A CNB021237913 A CN B021237913A CN 02123791 A CN02123791 A CN 02123791A CN 1176230 C CN1176230 C CN 1176230C
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- rotary kiln
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- molybdenum
- auxiliary hearth
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Abstract
The present invention relates to a process for calcining a molybdenum ore concentrate. Molybdenum oxide is formed by the oxidation desulfurization of molybdenum disulfide and calcined by utilizing an inner heating rotary kiln, an auxiliary furnace bed is arranged in the direction forming a right angle with the rotary kiln at the kiln head, a gas burner is arranged in the auxiliary furnace bed, flame in the gas burner forms a right angle with the rotary kiln, and a water-gas generator is positioned in a position which is 150 to 250mm below the centerline of the kiln, and on one side of the auxiliary furnace bed; the calcining temperature in the kiln is 500 to 580 DEG C, residual sulfur is desulfurized in the auxiliary furnace bed, and the temperature is controlled to be 550 to 600 DEG C, so that low-sulfur molybdenum oxide which comprises less than 0.07% of sulfur can be obtained.
Description
Technical field
The present invention relates to a kind of roasting method of concentrated molybdenum ore, the molybdenumdisulphide oxidation sweetening is formed molybdenum oxide.
Background technology
Concentrated molybdenum ore is mainly with molybdenumdisulphide (MoS
2) the form existence, standard ore deposit (Mo45%) sulfur-bearing is about about 33%.Prior art uses reverberatory furnace, multiple hearth furnace and external heating type rotary kiln etc. with the calcining molybdenum ore concentrate oxidation sweetening usually.
The reverberatory furnace investment is little, production capacity is low, but labor condition is abominable, tail gas SO
2Concentration is low, and single device day is handled concentrate 2 * 10
3Below the kg, belong to national explicit order and eliminate equipment.The multiple hearth furnace facility investment is big, adopts mechanical rake animal material, the layering temperature control, and single kiln production capacity is 20 * 10
3More than the kg, only be applicable to large-lot producer, too complicated because of device systems simultaneously, maintenance load is big, and the returning charge amount surpasses 20%, tail gas SO
2Concentration is lower than 1%.Adopt the external heating type rotary kiln to produce in the molybdenum oxide process, flame directly-fired kiln skin, the kiln body does not have firebrick lining, the furnace charge autothermal reaction is the direct heating kliner coating also, since inside and outside the gas that is heated and is corrosive form, service life of kiln body is shorter, the also as easy as rolling off a log fracture of kiln body of promptly using high temperature steel to make, and external heating type rotary kiln separate unit is handled concentrated molybdenum ore 3 * 10
3About kg, the reason of producing that can not maximize also is this.
Once adopted rotary kiln to carry out the roasting of chromium slag or vanadium slag in the prior art, in Chinese patent CN2082844U, had a detailed description.The rotary kiln that is adopted is that inner heating, slightly-inclined are placed, and burner is installed in kiln.The internal heating rotary kiln that the roasting of concentrated molybdenum ore of the present invention is used and the structure of this rotary kiln have significant difference, by auxiliary hearth is set, bring beneficial effect for the sulfur removal technology process and the product of concentrated molybdenum ore.
Summary of the invention
The present invention adopts the internally heated type rotary kiln to carry out the roasting of concentrated molybdenum ore, can overcome the numerous shortcomings that adopt reverberatory furnace, multiple hearth furnace or external heating type rotary kiln baking concentrated molybdenum ore.Can access doctor negative molybdenum oxide after the roasting.
The present invention utilizes the internally heated type rotary kiln to carry out roasting, this internally heated type rotary kiln is the speed governing rotary kiln made from general steel plate, the interior firebrick lining of building, the kiln hood place becomes vertical direction that auxiliary hearth is set with rotary kiln, and gas burner is placed in the auxiliary hearth, flame in the gas burner becomes vertical direction with rotary kiln, be positioned at 150-250mm under the kiln medullary ray, auxiliary hearth one side is provided with blue-gas generator, and coal gas imports burner, the kiln tail is installed cyclone and tail gas elution circuit, and reactions steps is as follows:
(1) concentrated molybdenum ore is sent in the internally heated type rotary kiln, promptly entered the desulfurization main reaction after going into kiln, maturing temperature is 500-580 ℃, and the residence time is 7-8 hour, and sulphur content is reduced to 1-2%, non-essential adding sweetening agent in the roasting process;
(2) take off residual sulphur in auxiliary hearth, temperature is controlled at 550-600 ℃, and the residence time is 20-50 minute, and the molybdenum oxide sulphur content reaches below 0.07%;
(3) reclaim the product molybdenum oxide, and return imitation frosted glass by cyclone and the collection of tail gas elution circuit.
When wherein coal gas imported burner, one time wind was adjusted the coal gas amount, and secondary air is adjusted oxygen-supplying amount.
Can directly utilize coal or oil to be fuel.
Furnace charge is 20-50 minute in the auxiliary hearth residence time, is preferably half an hour.
The concentrated molybdenum ore of desulfurization difficulty is added sweetening agent bicarbonate of ammonia when the roasting, and concentration is 1-3%.
This technology invention technical essential is: 1, auxiliary hearth is set takes off residual sulphur; 2, coal gasification combustion, a wind temperature control.Secondary air control excess air; 3, add sweetening agent and promote desulfurization.
Description of drawings
The internally heated type rotary kiln synoptic diagram that Fig. 1 uses for process for calcining molybdenum ore concentrate of the present invention.Wherein 1 is rotary kiln, and 2 is auxiliary hearth, and 3 is blue-gas generator, and 4 is the tail gas elution circuit, and 5 is charging machine.
Embodiment
Embodiment 1
Concentrated molybdenum ore is reinforced from kiln tail charging machine 5, and concentrate promptly enters the desulfurization main reaction after going into kiln.Concentrated molybdenum ore is evenly reinforced, adopts φ 1.6 * 21m rotary kiln, per hour reinforced 420kg, and maturing temperature is 550 ℃, and kiln residence time is 7.5 hours, and sulphur content reduces to 1.4% from about 30%.
Take off the residual sulphur stage and finish at auxiliary hearth, temperature is controlled at 580 ℃, to reduce molybdenum distillation loss.Furnace charge is 35 minutes in the secondary stove residence time.Because secondary stove has enough areas, furnace charge takes off the residual sulphur time at auxiliary hearth and can prolong as required.The imitation frosted glass amount of returning that collect kiln tailspin wind dust-precipitator and gravity dirt chamber accounts for total stuff amount below 10%, tail gas SO
2Concentration is 1%, utilizes the combustion of sulfur method to measure that sulphur content is 0.05% in the product molybdenum oxide.
Single kiln concentrate treatment capacity is 7 * 10
3More than the kg, molybdenum oxide output 5-6 * 10
3Kg.Flue gas enters eluting column and reclaims remaining molybdenum concentrate dust and gaseous state MoO after dry dust collection
3Comprise and do wet gathering dust, the molybdenum roasting rate of recovery reaches more than 98.5%.
Embodiment 2
Concentrated molybdenum ore is reinforced from kiln tail charging machine 5, and concentrate promptly enters the desulfurization main reaction after going into kiln.Concentrated molybdenum ore is evenly reinforced, adopts φ 1.6 * 21m rotary kiln, per hour reinforced 380kg, and maturing temperature is 560 ℃, and kiln residence time is 7 hours, and sulphur content reduces to 1.1% from about 30%.
Take off the residual sulphur stage and finish at auxiliary hearth, temperature is controlled at 590 ℃, to reduce molybdenum distillation loss.Furnace charge is 30 minutes in the auxiliary hearth residence time.Adding sweetening agent concentration is 1-3% bicarbonate of ammonia.The returning charge amount that collect kiln tailspin wind dust-precipitator and gravity dirt chamber accounts for total stuff amount below 10%, tail gas SO
2Concentration is 0.9%.Utilize the combustion of sulfur method to measure that sulphur content is 0.04% in the product molybdenum oxide.
Compare with traditional molybdenum roasting technique, the major advantage of this technology invention is:
| Sequence number | Reverberatory furnace | Many thoraxes kiln | The external heating type rotary kiln | The internal heating type rotary kiln | Remarks | |
| 1 | Amount of investment | Minimum | Maximum | Bigger | Less | |
| 2 | Single stove production capacity, T | 2 | 20 | 3-4 | 7-8 | In molybdenum concntrate |
| 3 | Return the burning rate, % | ＜5 | ＞20 | ＞20 | ＜10 | Comprise gather dust material and defective material |
| 4 | Applicability | Small-sized | Large-scale | Medium-sized | Medium-sized | |
| 5 | Molybdenum recovery, % | 97-98 | 98-99 | ＞98.5 | ＞98.5 | |
| 6 | Burning consumes | Bigger | Minimum | Maximum | Less |
Claims (4)
1, a kind of process for calcining molybdenum ore concentrate, it is characterized in that: utilize the internally heated type rotary kiln to carry out roasting, this internally heated type rotary kiln is the speed governing rotary kiln made from general steel plate, the interior firebrick lining of building, the kiln hood place becomes vertical direction that auxiliary hearth is set with rotary kiln, gas burner is placed in the auxiliary hearth, flame in the gas burner becomes vertical direction with rotary kiln, be positioned at 150-250mm under the kiln medullary ray, auxiliary hearth one side is provided with blue-gas generator, coal gas imports gas burner, and the kiln tail is installed cyclone and tail gas elution circuit, and reactions steps is as follows:
(1) concentrated molybdenum ore is sent in the internally heated type rotary kiln, promptly entered the desulfurization main reaction after going into kiln, maturing temperature is 500-580 ℃, and the residence time is 7-8 hour, and sulphur content is reduced to 1-2%, non-essential adding sweetening agent bicarbonate of ammonia in the roasting process, concentration 1-3%;
(2) take off residual sulphur in auxiliary hearth, temperature is controlled at 550-600 ℃, and the residence time is 20-50 minute, and the molybdenum oxide sulphur content reaches below 0.07%;
(3) reclaim the product molybdenum oxide, and return imitation frosted glass by cyclone and the collection of tail gas elution circuit.
The process of claim 1 wherein when coal gas imports gas burner that 2, one time wind is adjusted the coal gas amount, secondary air is adjusted oxygen-supplying amount.
3, the process of claim 1 wherein and directly utilize coal or oil to be fuel.
4, the process of claim 1 wherein that furnace charge is half an hour in the auxiliary hearth residence time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021237913A CN1176230C (en) | 2002-06-28 | 2002-06-28 | Process for calcining molybdenum ore concentrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021237913A CN1176230C (en) | 2002-06-28 | 2002-06-28 | Process for calcining molybdenum ore concentrate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1396278A CN1396278A (en) | 2003-02-12 |
| CN1176230C true CN1176230C (en) | 2004-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021237913A Expired - Fee Related CN1176230C (en) | 2002-06-28 | 2002-06-28 | Process for calcining molybdenum ore concentrate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101008045B (en) * | 2006-01-24 | 2010-10-13 | 洛阳栾川钼业集团冶炼有限责任公司 | Rotary flash distillation direct combustion heat-supply type rotary kiln baking apparatus and process for molybdenum concentrate |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101225481B (en) * | 2007-01-18 | 2010-05-19 | 中国地质科学院郑州矿产综合利用研究所 | Metallurgical extraction method of molybdenum-tungsten oxide bulk concentrate |
| CN101306804B (en) * | 2007-05-16 | 2010-10-13 | 洛阳栾川钼业集团冶炼有限责任公司 | Process for preparing acid from flue gas by calcining molybdenum concentrate in rotary kiln |
| CN101921908B (en) * | 2010-07-21 | 2012-06-27 | 洛阳栾川钼业集团股份有限公司 | Molybdenum concentrate self-heating roasting method and device thereof |
| CN106269206B (en) * | 2016-08-22 | 2019-08-23 | 中国地质科学院矿产综合利用研究所 | Method for comprehensively recovering low-grade molybdenum from copper concentrate containing organic carbon |
| CN112374470A (en) * | 2020-11-12 | 2021-02-19 | 郑州大学 | Method for treating molybdenum concentrate |
| CN114538516B (en) * | 2020-11-25 | 2023-10-20 | 中南大学 | Method for producing high-quality industrial molybdenum oxide by exhausting self-heating roasting |
-
2002
- 2002-06-28 CN CNB021237913A patent/CN1176230C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101008045B (en) * | 2006-01-24 | 2010-10-13 | 洛阳栾川钼业集团冶炼有限责任公司 | Rotary flash distillation direct combustion heat-supply type rotary kiln baking apparatus and process for molybdenum concentrate |
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| Publication number | Publication date |
|---|---|
| CN1396278A (en) | 2003-02-12 |
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Owner name: JINZHOU SHENGHONG INDUSTRY GROUP CO.,LTD. Free format text: FORMER OWNER: JINZHOU CITY SHENGHONG INDUSTRY CO.,LTD. Effective date: 20090807 |
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