CN103627895A - Production method for sintering chromium powder ore by continuous strand sinter machine - Google Patents

Production method for sintering chromium powder ore by continuous strand sinter machine Download PDF

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Publication number
CN103627895A
CN103627895A CN201310649070.5A CN201310649070A CN103627895A CN 103627895 A CN103627895 A CN 103627895A CN 201310649070 A CN201310649070 A CN 201310649070A CN 103627895 A CN103627895 A CN 103627895A
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sintering
production
agglomerate
weight parts
chromogen
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CN201310649070.5A
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CN103627895B (en
Inventor
向花亮
黄明述
蒋仁全
邓小东
李忠津
李波
张益�
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Qinghai Jinguang nickel chromium Material Co. Ltd.
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Sichuan Guang Guang Industrial (group) Ltd By Share Ltd
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Abstract

The invention discloses a production method for sintering a chromium powder ore, which can reduce the carbon amount, can decrease the energy consumption and improve the sintering yield and strength, and belongs to the technical field of ferrochrome production. The method comprises the following steps: firstly, 75-85 parts of chromium powder ore, 6-8 parts of coke powder, 3-7 parts of bentonite, 5-15 parts of magnesium-silicon raw material particles and return fines are introduced in a batching system; then 11-13% of water is added in the batching system for mixing and pelletizing to obtain mixed material balls; the sintering parameter is adjusted for sintering to obtain qualified sintering ore finished products. The production method largely improves the sintering yield, the strength of the sintering finished products and the porosity through comprehensively adjusting the raw materials, the ratios and the technique conditions in the sintering process of a continuous strand sinter machine under the precondition of guaranteeing the chromium grade in the actual production; the sintering method is suitable for popularization and application in the field.

Description

The production method of Dwight-Lloyd sintering machine sintering chromogen fine ore
Technical field
The invention belongs to ferrochrome production technical field, be specifically related to a kind of mixed carbon comtent that reduces, reduce energy consumption, improve the method for the sintering chromogen fine ore of sintering finished rate and intensity.
Background technology
In recent years, chromium powder ore is carried out to agglomeration processing, with it, replace primary lump ore to use, be the problem that domestic and international Ge Xi iron alloy manufacturing enterprise and research unit attach great importance to always.Because the physical property of chromium powder ore is unfavorable for sintering: smooth surface, wettability is poor, is difficult to granulation balling-up; Its fusing point is high, by ordinary method, is difficult to sinter into piece, so, there is no a good way and in industrial production, solve chromium powder ore Sintering Problem.At present, chromium powder ore processing mode is broadly divided into: sintering processes and the clamp dog of colding pressing are processed.Domestic in the majority to be cold-pressed into piece treatment process in recent years, and, sintering processes mode, at present still in the laboratory study stage, the domestic example that there is no suitability for industrialized production application,, has the treatment process of some oxidizing roasting pelletizings abroad.
Some countries and regions of table 1 adopt chromium powder ore pretreatment process
The clamp dog method of colding pressing: technique is simple, with low cost; Shortcoming: 1. briquette intensity difference, easily secondary efflorescence; 2. need to add more binding agent, reduce the grade of ore, or the binding agent adding contains the material harmful to smelting process.Enter mine heat furnace smelting, reduce energy consumption effect poor.
Pellet roasting method: fine chrome mine will reach pelletizing effect, must add more binding agent, same, can reduce the grade of ore; Continuous production is poor, generally adopts local method or shaft furnace roasting, and energy consumption is high.
, there is the first pelletizing of employing abroad, then enter the method for sinter machine roasting.Feature is, investment cost is large, the method oxidizing roasting temperature is in 1200 ℃, do not arrive the temperature of fusion of fine chrome mine, agglomerates of sintered pellets is generally the caking task that completes under oxidizing atmosphere, and its agglomerate does not reach prereduction effect, this sintered balls nodulizing, enter electric furnace, can not arrive raising burn-off rate, save the object of smelting coke consumption.
Application number is that 201310043112.0 Chinese patent discloses a kind of chromite fine ore sintering processing method of producing for stainless steel, it adopts laterite and chromite fine ore to carry out sintering, finally play and reduce mixed carbon comtent, reduce energy consumption and improve the problem of sintering strength, but it is also in the experimental study stage, not yet explanation can realize this sintering method in actual production, also undeclaredly in actual production, is proven.
Summary of the invention
Technical problem to be solved by this invention is to provide and a kind ofly in actual production, can reduces mixed carbon comtent, reduces energy consumption, improves the method for the Dwight-Lloyd sintering machine sintering chromogen fine ore of sintering finished rate and intensity.
The technical solution adopted for the present invention to solve the technical problems is: the production method of Dwight-Lloyd sintering machine sintering chromogen fine ore, comprises the following steps:
A, by the magnesium siliceous raw material particle of the wilkinite of the coke powder of the chromogen fine ore of 75～85 weight parts, 6～8 weight parts, 3～7 weight parts, 5～15 weight parts and return mine and send into feed proportioning system, the water that adds again mixture gross weight 11～13%, obtains mixing pellet through batch mixing and granulation; Described returning mine is the agglomerate that the granularity that obtains after step c screening in last batch production process is 0～6mm;
B, thick at sintering pallet upper berth grate-layer material 30～40mm, by spreader of sintering machine, mixing pellet is layered in grate-layer material again, under 1100 ± 20 ℃ of ignition temperatures, 2～2.5 minutes ignition time, bellows negative pressure-11～-13Kpa condition, light a fire, under 1450 ± 20 ℃ of conditions of sintering temperature, sintering is 20～30 minutes, obtains agglomerate; Described grate-layer material is the agglomerate of granularity 6～20mm that in last batch production process, step c obtains after sieving;
C, the agglomerate that step c is obtained are crushed to granularity and are less than 100mm, and then screening obtains the agglomerate that granularity is respectively 0～6mm, 6～20mm and 20～100mm; The agglomerate of 0～6mm all returns as the returning mine of next batch production stage a, and the agglomerate of 6～20mm is measured the grate-layer material of returning as next batch production stage b according to demand, and the agglomerate of 20～100mm is that finished product enters sintering silo.
It will be understood by those skilled in the art that, the production of each batch of the present invention all will be used last batch and be produced the material obtaining, it is the process of a circulation, when producing for the first time, can return mine or replace with forming similar material, for grate-layer material, can replace with the material of similar composition and granularity.Agglomerate is crushed to granularity is less than 100mm described in step c of the present invention, when concrete production operation, only need to be crushed to and meet granularity and be all less than 100mm, without carrying out further fragmentation, otherwise final granularity is meticulous, and finished product is very few, return mine more, be unfavorable for producing; Generally, the agglomerate of 0～6mm that the present invention obtains (being that next batch is used the amount of returning mine) is all in 10 weight part left and right.It will be understood by those skilled in the art that, so long as the agglomerate of the 0～6mm obtaining on same production line, the present invention is all for the returning mine of next batch, if for the different production lines of different throughput, carry out proportioning return mine by 10 weight parts left and right.
Chromogen fine ore of the present invention, fine chrome mine fine ore is by weight containing Cr 2o 350～60%, containing the full iron of TFe() 10～20%.
Magnesium siliceous raw material of the present invention can be the particles such as serpentine, silica, magnesia, magnesite, can to the needs of slag composition, choose according to smelting technology.
Wherein, in aforesaid method step a, the amount of allocating into of magnesium siliceous raw material particle is 6～10 weight parts.
Wherein, in aforesaid method step a, by the magnesium siliceous raw material particle of the wilkinite of the coke powder of the chromogen fine ore of 80 weight parts, 7 weight parts, 5 weight parts, 8 weight parts and return mine and send into feed proportioning system.
Wherein, the granularity of the particle of magnesium siliceous raw material described in aforesaid method step a is less than 8mm.
Wherein, in aforesaid method step a, the weight that adds water is 11.5～12.5% of mixture gross weight.
Wherein, in aforesaid method step a, described in the amount of returning mine be 9～11 weight parts.
Wherein, in aforesaid method step b, on sintering pallet, the total thickness of stone is 470～530mm.
The invention has the beneficial effects as follows: the present invention is by adopting suitable raw material and proportioning, by the reasonable control to sintering parameter, be equipped with rational technological process, these measures comprehensively make mixed carbon comtent of the present invention low, thereby reduced energy consumption, and the yield rate of sintering and sintering finished intensity have all obtained significantly improving.The present invention is by the comprehensive adjustment to raw material, proportioning and processing condition in Dwight-Lloyd sintering machine sintering process, make in actual production, guaranteeing under the prerequisite of chromium grade, yield rate can reach more than 86%, dropping strength reaches more than 82%, barrate strength reaches more than 76%, wear-resistant index reaches more than 25%, comprehensive adjustment of the present invention has obtained unexpected net effect, and technical solution of the present invention is suitable for applying in this area.
Accompanying drawing explanation
Fig. 1 is wherein a kind of schematic process flow diagram of embodiment of the present invention.
Embodiment
Below by embodiment, the present invention is further described.
The production method of Dwight-Lloyd sintering machine sintering chromogen fine ore of the present invention, comprises the following steps:
A, by the magnesium siliceous raw material particle of the wilkinite of the coke powder of the chromogen fine ore of 75～85 weight parts, 6～8 weight parts, 3～7 weight parts, 5～15 weight parts and return mine and send into feed proportioning system, the water that adds again mixture gross weight 11～13%, obtains mixing pellet through batch mixing and granulation; Described returning mine is the agglomerate that the granularity that obtains after step c screening in last batch production process is 0～6mm;
B, thick at sintering pallet upper berth grate-layer material 30～40mm, by spreader of sintering machine, mixing pellet is layered in grate-layer material again, under 1100 ± 20 ℃ of ignition temperatures, 2～2.5 minutes ignition time, bellows negative pressure-11～-13Kpa condition, light a fire, under 1450 ± 20 ℃ of conditions of sintering temperature, sintering is 20～30 minutes, obtains agglomerate; Described grate-layer material is the agglomerate of granularity 6～20mm that in last batch production process, step c obtains after sieving;
C, the agglomerate that step c is obtained are crushed to granularity and are less than 100mm, and then screening obtains the agglomerate that granularity is respectively 0～6mm, 6～20mm and 20～100mm; The agglomerate of 0～6mm all returns as the returning mine of next batch production stage a, and the agglomerate of 6～20mm is measured the grate-layer material of returning as next batch production stage b according to demand, and the agglomerate of 20～100mm is that finished product enters sintering silo.
Wherein, in aforesaid method step a, in order to improve sintering finished chromium grade, do not affect sintering finished rate and intensity, the amount of allocating into of preferably magnesium siliceous raw material particle is 6～10 weight parts simultaneously.
Wherein, in aforesaid method step a, in order to make sintering finished overall target best, preferably by the magnesium siliceous raw material particle of the wilkinite of the coke powder of the chromogen fine ore of 80 weight parts, 7 weight parts, 5 weight parts, 8 weight parts and return mine and send into feed proportioning system.
Wherein, in aforesaid method step a, the granularity of preferred described magnesium siliceous raw material particle is less than 8mm, and sintering effect is better like this.
Wherein, in aforesaid method step a, in order to make sintering effect better, the weight that preferably adds water is 11.5～12.5% of mixture gross weight.
Wherein, in aforesaid method step a, the agglomerate that the granularity obtaining due to all last batches is 0～6mm all returns as returning mine, so the amount that the present invention returns mine is conventionally all 9～11 weight parts.
Wherein, in aforesaid method step b, preferably on sintering pallet, the total thickness of stone is 470～530mm.
Below by embodiment, the specific embodiment of the present invention is described further, but therefore protection scope of the present invention is not limited among embodiment.
Embodiment mono-
The raw material index that embodiment uses in Table 2, table 3 and table 4:
Table 2 supplementary material chemical composition (% by weight)
The chemical composition of table 3 coke powder (% by weight)
Material name Fixed carbon Fugitive constituent Ash content S Moisture content 0.05～3㎜
Coke powder 72.17 8.56 7.98 0.78 9.5 ≥80%
Table 4 wilkinite index
That in embodiment, use is 45m 2dwight-Lloyd sintering machine, partial parameters is as table 5:
Table 5 45m 2dwight-Lloyd sintering machine partial parameters
Effective sintering area 45m 2
Chassis size (long * wide) 1.5×1m
Bellows negative pressure -8～-18Kpa
Sinter bed height ≤600mm
Grate-layer material is thick 20～50mm
Chassis number 50
Chassis travelling speed 0.00～2.0m/min
Igniting gas flow (operating mode) 90～400m 3/h
Combustion air pressure ＜10KPa
The maximum feeding coal of compound 70t/h
By the chromogen fine ore of 80 composition by weight (being the South Africa fine ore described in above-mentioned raw materials and Turkey's fine ore); the coke powder of 7 composition by weight; the wilkinite of 5 composition by weight; the magnesium siliceous raw material particle of 8 composition by weight; above-mentioned material is prepared burden by the feed proportioning system of sinter machine, and mixture adds 12% water again according to gross weight, after cylindrical mixer and drum pelletizer; the mixing ball material of granulation, enters Strand Sintering Machine Pallet.On at the bottom of Strand Sintering Machine Pallet, first spread granularity 6～20mm, thickness 35mm grate-layer material.Then repave and mix ball material, bed thickness is in 500mm left and right, 1100～1110 ℃ of ignition temperatures, 2～2.5 minutes ignition time, in bellows negative pressure-11 of vacuum fan～-12Kpa situation, light a fire, in 1450 ℃ of conditions of sintering temperature, carry out sintering, sintering time, after 20～30 minutes, obtains agglomerate.This batch of agglomerate co-sintering produced 32380 tons of qualified sinters, the average chromium grade (Cr of qualified sinter 2o 3) 38.5%.This sintering composition and engineering parameter is the most reasonable, and statistical index data is as table 6:
Table 6 agglomerate physical performance index (one)
Note: yield rate refers to that granularity is greater than 20 ㎜, is less than the finished product percentage of 100 ㎜.
Comparative example one
A, applicant just by the magnesium siliceous raw material particle of embodiment mono-with addition of amount, bring up to 15 weight parts, statistical index data is in Table 7, yield rate rises, each intensity index is similar or increase, many but the chromium grade of agglomerate finished product declines, average grade is (Cr 2o 3) 35.2%, reduce approximately 3.3% grade.
Table 7 agglomerate physical performance index (two)
B, applicant just by applicant just by the magnesium siliceous raw material particle of embodiment mono-with addition of amount, turn down 3 weight parts, statistical index data is in Table 8, indices all declines to a great extent, chromium average grade rises to (Cr 2o 3) 39.9%, magnesium siliceous raw material particle plays an important role to sintering as can be seen here.
Table 8 agglomerate physical performance index (three)
C, applicant just just turn down 10.5 weight parts by the moisture adding of embodiment mono-by applicant, and statistical index data is in Table 9, and indices all declines to a great extent, and chromium average grade is (Cr 2o 3) 37.8%, moisture plays an important role to sintering as can be seen here.
Table 9 agglomerate physical performance index (four)
The test that moisture is heightened was done in D, application equally, but when moisture is greater than 13 weight part, during higher than the scope of the invention, the granulating efficiency of mixture increases and obviously improves with amount of water, but, enter after pallet, the excessive moistening layer of the bed of material thickens, affect ventilation property, even if vacuum fan bellows negative pressure is by being increased to-14～-15Kpa in-10～-12Kpa situation, even if take to reduce machine speed, reduce the measures such as bed thickness (450～550mm to 250～350mm), final sintering effect is also not obvious, and after sintering, indices is lower.
E, that applicant is just controlled at respectively the scope of the invention by the bentonitic amount of embodiment mono-is outer and inner, as shown in table 10, and other parameters do not become, and after sintering, finished product index is in Table 11:
The size composition (%) of compound when table 10 adds different ratios wilkinite
Agglomerate physical performance index under the different bentonite ore ratio conditions of table 11
As for ignition temperature and sintering temperature, while being controlled at 1000 ℃ such as ignition temperature, chassis mixture surface point combustion deleterious, even if extending to 3.5 minutes ignition time, it is also not obvious lighting effect improved.When ignition temperature is controlled to 1200 ℃, 1.5～2 minutes ignition time, there is superfusion phenomenon in chassis mixture surface, charge level ventilation property variation, and bellows negative pressure raises, and affects sintering.The concrete control of sintering parameter of the present invention, make the local soft heat of raw material of the present invention, partial oxide prereduction, in the reductibility furnace gas of bed of material top, ferric oxide is very easily reduced into free iron, and this reduction mode has been strengthened the self-catalysis of reduction process, improve sintering effect, agglomerate void content is high, and specific surface area is large, makes sinter quality superior performance, intensity is high, epigranular, and electric furnace is had improved breathability.
From above-described embodiment and comparative example, only have the processing parameter adopting after the comprehensive adjustment of the present invention could realize agglomerate high rate of finished products, high strength, and chromium is of high grade, chromium loss is few, if one of them parameter or feature have greatly changed, all can produce larger impact to final effect.In a word, adopt the technical scheme after comprehensive regulation of the present invention, can make full use of chromium powder ore resource, sintering effect is good, energy-saving and cost-reducing, and, than raw ore, directly into stove, smelt and compare, can realize automatization, maximization, totally-enclosed electrosmelting, reduce discharge, realize coal-gas recovering utilization, meet the relevant policies of country's " energy-saving and emission-reduction ", " recycling economy ", there are wide market outlook.

Claims (7)

1. the production method of Dwight-Lloyd sintering machine sintering chromogen fine ore, is characterized in that comprising the following steps:
A, by the magnesium siliceous raw material particle of the wilkinite of the coke powder of the chromogen fine ore of 75～85 weight parts, 6～8 weight parts, 3～7 weight parts, 5～15 weight parts and return mine and send into feed proportioning system, the water that adds again mixture gross weight 11～13%, obtains mixing pellet through batch mixing and granulation; Described returning mine is the agglomerate that the granularity that obtains after step c screening in last batch production process is 0～6mm;
B, thick at sintering pallet upper berth grate-layer material 30～40mm, by spreader of sintering machine, mixing pellet is layered in grate-layer material again, under 1100 ± 20 ℃ of ignition temperatures, 2～2.5 minutes ignition time, bellows negative pressure-11～-13Kpa condition, light a fire, under 1450 ± 20 ℃ of conditions of sintering temperature, sintering is 20～30 minutes, obtains agglomerate; Described grate-layer material is the agglomerate of granularity 6～20mm that in last batch production process, step c obtains after sieving;
C, the agglomerate that step c is obtained are crushed to granularity and are less than 100mm, and then screening obtains the agglomerate that granularity is respectively 0～6mm, 6～20mm and 20～100mm; The agglomerate of 0～6mm all returns as the returning mine of next batch production stage a, and the agglomerate of 6～20mm is measured the grate-layer material of returning as next batch production stage b according to demand, and the agglomerate of 20～100mm is that finished product enters sintering silo.
2. the production method of Dwight-Lloyd sintering machine sintering chromogen fine ore according to claim 1, is characterized in that: in step a, the amount of allocating into of magnesium siliceous raw material particle is 6～10 weight parts.
3. the production method of Dwight-Lloyd sintering machine sintering chromogen fine ore according to claim 2, it is characterized in that: in step a, by the magnesium siliceous raw material particle of the wilkinite of the coke powder of the chromogen fine ore of 80 weight parts, 7 weight parts, 5 weight parts, 8 weight parts and return mine and send into feed proportioning system.
4. the production method of Dwight-Lloyd sintering machine sintering chromogen fine ore according to claim 1, is characterized in that: the granularity of the siliceous raw material of magnesium described in step a particle is less than 8mm.
5. the production method of Dwight-Lloyd sintering machine sintering chromogen fine ore according to claim 1, is characterized in that: in step a, the weight that adds water is 11.5～12.5% of mixture gross weight.
6. the production method of Dwight-Lloyd sintering machine sintering chromogen fine ore according to claim 1, is characterized in that: in step a, described in the amount of returning mine be 9～11 weight parts.
7. the production method of Dwight-Lloyd sintering machine sintering chromogen fine ore according to claim 1, is characterized in that: in step b, on sintering pallet, the total thickness of stone is 470～530mm.
CN201310649070.5A 2013-12-04 2013-12-04 Production method for sintering chromium powder ore by continuous strand sinter machine Expired - Fee Related CN103627895B (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104745808A (en) * 2015-04-09 2015-07-01 常熟鼎天赫机械有限公司 Process for efficiently sintering multi-matrix powder
CN105483365A (en) * 2016-02-03 2016-04-13 四川金广实业（集团）股份有限公司 Laterite and chromium concentrate mixed sintered ore and production method for smelting nickel-chromium-iron alloy thereof
CN106048213A (en) * 2016-08-25 2016-10-26 青海金广镍铬材料有限公司 Method for smelting high carbon ferro-chrome containing nickel from chlorite powder sinter
CN109943712A (en) * 2019-04-02 2019-06-28 青海际华江源实业有限公司 A kind of chromite ore fine sintering method and sintering system
CN111876594A (en) * 2020-08-06 2020-11-03 徐州宏阳新材料科技有限公司 Furnace charge formula for improving ferrochrome smelting property and processing method thereof
CN111876592A (en) * 2020-08-06 2020-11-03 徐州宏阳新材料科技有限公司 Environment-friendly ferrochrome smelting furnace burden and preparation method thereof

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JPS60169527A (en) * 1984-02-15 1985-09-03 Sumitomo Metal Ind Ltd Production of sintered ore
JPS62107032A (en) * 1985-11-01 1987-05-18 Sumitomo Metal Ind Ltd Two-stage-ignition sintering method
CN103045859A (en) * 2013-02-04 2013-04-17 重庆大学 Chromium-iron mineral powder sintering method for stainless steel production

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JPS5789440A (en) * 1980-11-25 1982-06-03 Nippon Steel Corp Production of sintered ore
JPS60169527A (en) * 1984-02-15 1985-09-03 Sumitomo Metal Ind Ltd Production of sintered ore
JPS62107032A (en) * 1985-11-01 1987-05-18 Sumitomo Metal Ind Ltd Two-stage-ignition sintering method
CN103045859A (en) * 2013-02-04 2013-04-17 重庆大学 Chromium-iron mineral powder sintering method for stainless steel production

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104745808A (en) * 2015-04-09 2015-07-01 常熟鼎天赫机械有限公司 Process for efficiently sintering multi-matrix powder
CN105483365A (en) * 2016-02-03 2016-04-13 四川金广实业（集团）股份有限公司 Laterite and chromium concentrate mixed sintered ore and production method for smelting nickel-chromium-iron alloy thereof
CN106048213A (en) * 2016-08-25 2016-10-26 青海金广镍铬材料有限公司 Method for smelting high carbon ferro-chrome containing nickel from chlorite powder sinter
CN109943712A (en) * 2019-04-02 2019-06-28 青海际华江源实业有限公司 A kind of chromite ore fine sintering method and sintering system
CN109943712B (en) * 2019-04-02 2020-10-27 青海际华江源实业有限公司 Chromium mineral powder sintering method and sintering system
CN111876594A (en) * 2020-08-06 2020-11-03 徐州宏阳新材料科技有限公司 Furnace charge formula for improving ferrochrome smelting property and processing method thereof
CN111876592A (en) * 2020-08-06 2020-11-03 徐州宏阳新材料科技有限公司 Environment-friendly ferrochrome smelting furnace burden and preparation method thereof

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