CN206986217U - A kind of system for improving rotary hearth furnace production capacity - Google Patents

Abstract

A kind of system for improving rotary hearth furnace production capacity is the utility model is related to, wherein, the system includes：First ball and drying unit and the described first ball and drying unit processed processed is connected to form first screening plant in first circulation loop；Second ball and drying unit and the described second ball and drying unit processed processed is connected to form second screening plant in second circulation loop；What is be connected respectively with first screening plant and the second screening plant has the rotary hearth furnace of double cloth systems；The 3rd screening plant being connected with the rotary hearth furnace；The ferro-nickel product generating means being connected with the 3rd screening plant；The ferrochrome product generating means being connected with the 3rd screening plant.The utility model has the characteristics that energy utilization rate and production capacity are high.

Description

A kind of system for improving rotary hearth furnace production capacity

Technical field

The utility model belongs to field of metallurgy, and in particular to a kind of system for improving rotary hearth furnace production capacity.

Background technology

In metallurgical industry, ferrochrome as the additive of steel produce a variety of high intensity, anticorrosive, wear-resisting, high temperature resistant, The special steel and special alloy of resistance to oxidation, such as stainless steel, ball-bearing steel, these special steels and special alloy are in aviation, space Boat, automobile, shipbuilding and national defense industry field are widely used.

At present, to reduce the cost of ferrochrome production equipment in industrial production, each factory tends to use large-scale reduction closed electric furnace, These electric furnaces must use block chromite.And exploit two kinds world's chromite year, lump ore only accounts for 20%, and about 80% is fine ore（- 8mm）.Due to lump chromite supply bottleneck, this just forces each factory to use cheap fine ore, but this kind of ore deposit need to pass through pretreatment Stove smelting can be entered.Currently, the technique based on pre-reduction treatment mainly has：SRC techniques, DRC methods etc..SRC methods are a kind of utilize back Rotary kiln carries out the technique of prereduction to chromite, and idiographic flow is：Pelletizing is made in fine ore and carbon reducing agent in proportion first, Pelletizing after drying is directly entered in rotary kiln, sprays into coal dust or gas-fired in discharge end, general control is at 1100 ~ 1250 DEG C Prereduction is carried out to metallic iron and chromium in temperature range, the pelletizing of reduction is then sent through in mineral hot furnace, and then obtains ferrochrome product.Phase To traditional handicraft, rotary kiln not only rationally make use of chromite powder resource, also realize a certain degree of energy-saving effect, but the work Skill, which still suffers from problems with, to be needed to solve：The easy ring formation of rotary kiln device, operating rate are low；Chromite quality requirements are high, SiO2 contents Less than 6%, ring formation of rotary kiln is otherwise also easily caused, produces not direct motion；Rotary kiln pre-reduction temperature is low, and chromite pelletizing chromium is gone back Former degree is not high, and easily crushes, and intractability is added to next step melting.The pelletizing that is a difference in that of DRC methods and SRC methods is not Reduced in rotary kiln but on rotary hearth furnace, this method it is similar with SRC into ball portion, be to chromite powder be incorporated Balling-up after reducing agent, rotary hearth furnace is distributed into again after pelletizing drying and is reduced, paper《The basis of chromite solid state reduction and its reinforcing Technical research》Introduce, in DRC methods, the green pellets thickness 35mm of rotary furnace bottom laying, ignition temperature 1400 in rotary hearth furnace DEG C, the Cr2O3 of metallized pellet reduction degree reaches 80% after reduction.DRC methods replace rotary kiln with rotary hearth furnace, in the absence of revolution The problem of kiln plant ring formation, but in rotary hearth furnace, fuel combustion is produced from heat mainly by way of radiant heat transfer from upper Chromite pelletizing is passed under and, this heat transfer type just determines, the cloth to that can only take the thin bed of material during rotary hearth furnace cloth Mode（Thickness of feed layer≤35mm）, otherwise can cause Different layer of the compost pelletizing reduce it is uneven, by upper strata to lower floor pelletizing also The situation that former effect is gradually deteriorated, finally influences product index.It can be said that it is that rotary hearth furnace and life are all that can only select thin bed of material cloth The big drawback come, this also greatly limit the production capacity of rotary hearth furnace.And the deep bed sintering cloth of rotary hearth furnace how is realized so as to improve The production capacity of rotary hearth furnace, turn into a big difficult point, available data in the industry and show, so far also without good solution method.Therefore, it is how real Existing rotary hearth furnace deep bed sintering cloth, improves energy utilization rate, increases rotary hearth furnace production capacity, turns into problem urgently to be resolved hurrily.

Utility model content

The utility model is in view of the shortcomings of the prior art, it is proposed that a kind of system for improving rotary hearth furnace production capacity, has the energy The characteristics of utilization rate and high production capacity.

In order to solve the above technical problems, the utility model proposes a kind of system for improving rotary hearth furnace production capacity, its feature exists In, including：First ball and drying unit processed, the first screening plant, the second ball and drying unit processed, the second screening plant, turn bottom Stove, the 3rd screening plant, ferro-nickel product generating means and ferrochrome product generating means, wherein, first ball processed and drying dress Put and interconnected with first screening plant, for sieving to obtain lateritic nickel ore carbonaceous pelletizing repeatedly；Second ball processed and Drying unit interconnects with second screening plant, for sieving to obtain chromite carbonaceous pelletizing repeatedly；With double clothes The rotary hearth furnace of system is connected with first screening plant and the second screening plant respectively, for the chromite of big particle diameter is carbon containing Pelletizing mixes reduction with the lateritic nickel ore carbonaceous pelletizing of small particle；3rd screening plant is connected with the rotary hearth furnace, is used for The pelletizing after reduction is sieved according to the particle size differences of two kinds of pelletizings, respectively obtains lateritic nickel ore reducting pellet and chromite Reducting pellet；The ferro-nickel product generating means are connected with the 3rd screening plant, and lateritic nickel ore reducting pellet is carried out into thing Reason sorting, obtains ferro-nickel product and mine tailing；The ferrochrome product generating means are connected with the 3rd screening plant, by chromite Reducting pellet carries out high melt, obtains ferrochrome product.

Further, the described first ball and drying unit processed includes：Lateritic nickel ore entrance, the first reducing agent entrance, first Additive entrance, the first water inlet, lateritic nickel ore returning charge entrance and lateritic nickel ore ball products export, first screening plant Including：Lateritic nickel ore ball product inlet, lateritic nickel ore returning charge outlet, the outlet of lateritic nickel ore carbonaceous pelletizing, first ball processed And drying unit is connected to form first circulation loop with first screening plant, the first circulation loop is：The laterite Nickel minerals ball product inlet is connected with the lateritic nickel ore ball products export, lateritic nickel ore returning charge outlet and lateritic nickel ore returning charge Entrance is connected, for sieving lateritic nickel ore ball product repeatedly to obtain the lateritic nickel ore carbonaceous pelletizing that particle diameter is 5-16mm.

Further, the described second ball and drying unit processed includes：Chromite entrance, the second reducing agent entrance, second add Add agent entrance, the second water inlet, chromite returning charge entrance and chromite ball products export, second screening plant includes： Chromite ball product inlet, chromite returning charge outlet, chromite carbonaceous pelletizing outlet, second ball and drying unit processed with Second screening plant is connected to form second circulation loop, and the second circulation loop is：The chromite ball product enters Mouthful it is connected with the lateritic nickel ore ball products export, chromite returning charge outlet is connected with chromite returning charge entrance, for by chromium Iron ore ball product carries out screening repeatedly and obtains particle diameter >=18mm chromite carbonaceous pelletizing.

Further, the rotary hearth furnace with double cloth systems includes：Rotary hearth furnace furnace chamber, ring-shaped furnace bottom and exhanst gas outlet, its In, the ring-shaped furnace bottom is rotatably arranged in the rotary hearth furnace furnace chamber bottom, the rotary hearth furnace furnace chamber be circumferentially divided into feed zone, Reducing zone and discharge zone, the feed zone are provided with the first distribution device and the second distribution device, first distribution device with it is red Native nickel minerals carbonaceous pelletizing outlet is connected, and second distribution device is connected with the outlet of chromite carbonaceous pelletizing, first cloth Lateritic nickel ore carbonaceous pelletizing is layered on lower floor by device, and chromite carbonaceous pelletizing is layered on upper strata by second distribution device；It is described Discharge zone is provided with rotary hearth furnace discharging device, for obtaining mixing reducting pellet.

Further, the 3rd screening plant includes：Mix reducting pellet entrance, chromite reducting pellet exports and red Native nickel minerals reducting pellet outlet, the mixing reducting pellet entrance is connected with the rotary hearth furnace discharging device, for mixing to be gone back Protocorm group carries out screening process, respectively obtains particle diameter different chromite reducting pellet and lateritic nickel ore reducting pellet.

Further, the ferro-nickel product generating means include：Lateritic nickel ore reducting pellet entrance, ferro-nickel product outlet and Mine tailing exports, and the lateritic nickel ore reducting pellet entrance and the lateritic nickel ore reducting pellet, which export, to be connected, for by laterite nickel Ore deposit reducting pellet carries out physical separation, obtains ferro-nickel product and mine tailing.

Further, the ferrochrome product generating means include：Chromite reducting pellet entrance, ferrochrome product outlet and chromium Scum exports, and the chromite reducting pellet entrance is connected with chromite reducting pellet outlet, for chromite to be reduced Pelletizing carries out high melt, obtains ferrochrome product.

The utility model comprises at least following beneficial effect：

1）Chromite is different with the particle size of lateritic nickel ore carbonaceous pelletizing, and chromite carbonaceous pelletizing particle diameter is more than laterite Nickel minerals carbonaceous pelletizing, make that certain space can be left between chromite pelletizing and pelletizing, and will not be incited somebody to action by the small pelletizing of diameter excessively Space is filled up, and such bed of material is designed with the conduction between the chromite bed of material beneficial to heat, and thermal loss is few, can make more heat Amount reaches the lateritic nickel ore bed of material of lower floor, and does not influence the reduction effect of chromite, and energy utilization rate is high；

2）Lateritic nickel ore reducting pellet is different with the subsequent treatment process of chromite reducting pellet, improves existing processing chromium The DRC of iron ore technique, by-product lateritic nickel ore also original product while ferrochrome also original product is obtained, afterwards lateritic nickel ore reduction Product only need to can obtain ferro-nickel product through simple physical separation, improve added value of product；

3）Using the different reduction characteristics of different type raw material, the deep bed sintering cloth of rotary hearth furnace is realized, improves energy profit With rate, increase rotary hearth furnace production capacity；

4）Rotary hearth furnace reduction process realizes deep bed sintering cloth, heat energy in Different layer of the compost by cascade utilization to greatest extent, Energy utilization rate is improved, increases rotary hearth furnace production capacity, so as to reduce process energy consumption and cost；

5）Chromite carbonaceous pelletizing balling property is good, and pellet strength is high；And reducing agent is with addition of reasonable, the ferrochrome after reduction Ore deposit pelletizing occurs without powder phenomenon-tion, and the chromite reducting pellet and lateritic nickel ore reducting pellet after rotary hearth furnace reduction can be according to pelletizings The difference of particle diameter realizes both efficiently separate.

Brief description of the drawings

Fig. 1 is the flow chart of the utility model method.

Fig. 2 is the structural representation of Tthe utility model system.

Wherein, the first ball and drying unit 1 processed, lateritic nickel ore entrance 101, the first reducing agent entrance 102, the first additive Entrance 103, the first water inlet 104, lateritic nickel ore returning charge entrance 105, lateritic nickel ore ball products export 106, the first screening dress 2 are put, lateritic nickel ore ball product inlet 201, lateritic nickel ore returning charge outlet 202, lateritic nickel ore carbonaceous pelletizing export 203, second Ball and drying unit 3 processed, chromite entrance 301, the second reducing agent entrance 302, Second addition entrance 303, the second water inlet 304th, chromite returning charge entrance 305, chromite ball products export 306, the second screening plant 4, chromite ball product inlet 401, chromite returning charge outlet 402, chromite carbonaceous pelletizing outlet 403, rotary hearth furnace 5, the 3rd screening plant 6, mix and go back protocorm Group's entrance 601, chromite reducting pellet outlet 602, lateritic nickel ore reducting pellet outlet 603, ferro-nickel product generating means 7 are red Native nickel minerals reducting pellet entrance 701, ferro-nickel product outlet 702, mine tailing outlet 703, ferrochrome product generating means 8, chromite is also Protocorm group's entrance 801, ferrochrome product outlet 802, ferrochrome slag outlet 803.

Embodiment

In order that those skilled in the art more fully understand the technical solution of the utility model, with reference to specific embodiment The utility model is described in further detail.The embodiments described below is exemplary, is only used for explaining that this practicality is new Type, and it is not intended that to limitation of the present utility model.Unreceipted particular technique or condition in embodiment, according in the art Document described by technology or condition or carried out according to product description.

The utility model proposes a kind of system for improving rotary hearth furnace production capacity, according to embodiment of the present utility model, Fig. 2 is The structural representation of Tthe utility model system, shown in reference picture 2, system described in the utility model includes：First ball processed and drying Device 1, the first screening plant 2, the second screening plant 4 of ball and drying unit 3, second processed, the rotary hearth furnace with double cloth systems 5th, the 3rd screening plant 6, ferro-nickel product generating means 7 and ferrochrome product generating means 8.

According to embodiment of the present utility model, shown in reference picture 2, first ball and drying unit processed and the described first sieve Separating device is connected to form first circulation loop, specifically, first ball and drying unit processed include：Lateritic nickel ore entrance 101, First reducing agent entrance 102, the first additive entrance 103, the first water inlet 104, lateritic nickel ore returning charge entrance 105 and laterite nickel Ore deposit ball products export 106, first screening plant include：Lateritic nickel ore ball product inlet 201, lateritic nickel ore returning charge go out Mouth 202, lateritic nickel ore carbonaceous pelletizing outlet 203, wherein, the first circulation loop is：The lateritic nickel ore ball product enters Mouth is connected with the lateritic nickel ore ball products export, and lateritic nickel ore returning charge outlet is connected with lateritic nickel ore returning charge entrance, is used for Lateritic nickel ore ball product is sieved repeatedly to obtain the lateritic nickel ore carbonaceous pelletizing that particle diameter is 5-16mm.

According to some embodiments of the utility model, first ball and drying unit processed described in the utility model include：First Ball processed and the first drying unit, it is corresponded to respectively is preferably：Disc balling machine and dryer.

According to embodiment of the present utility model, shown in reference picture 2, second ball and drying unit processed and the described second sieve Separating device is connected to form second circulation loop, specifically, second ball and drying unit processed include：Chromite entrance 301, Two reducing agent entrances 302, Second addition entrance 303, the second water inlet 304, chromite returning charge entrance 305 and chromite ball Products export 306, second screening plant include：Chromite ball product inlet 401, chromite returning charge outlet 402, ferrochrome Ore deposit carbonaceous pelletizing outlet 403, wherein, the second circulation loop is：The chromite ball product inlet and the laterite nickel Ore deposit ball products export is connected, and chromite returning charge outlet is connected with chromite returning charge entrance, for chromite ball product to be entered Screening obtains particle diameter >=18mm chromite carbonaceous pelletizing to row repeatedly.

According to some embodiments of the utility model, second ball and drying unit processed described in the utility model include：Second Ball processed and the second drying unit, it is corresponded to respectively is preferably：Disc balling machine and dryer.

According to some embodiments of the utility model, the chromite that the utility model chromite is made larger granularity is carbon containing Pelletizing, lateritic nickel ore is made to the lateritic nickel ore carbonaceous pelletizing of smaller particle size, will easily be reduced using rotary hearth furnace double cloth systems Lateritic nickel ore carbonaceous pelletizing is evenly arranged on the furnace bottom of rotary hearth furnace, then the chromite carbonaceous pelletizing of hardly possible reduction is covered in into laterite The upper strata of nickel ore pellet, in reduction process, using chromite and lateritic nickel ore to the different demands of reduction temperature, produce fuel Raw heat energy by radiant heat transfer mode in Different layer of the compost by cascade utilization to greatest extent, so as to complete to chromite and laterite The reduction of nickel minerals, after the screened processing of mixing reducting pellet for discharging rotary hearth furnace, both can be realized according to the difference of pelletizing particle diameter Efficiently separate, respectively obtain chromite reducting pellet and lateritic nickel ore reducting pellet.

According to embodiment of the present utility model, shown in reference picture 2, the rotary hearth furnace with double cloth systems respectively with institute State the first screening plant and the second screening plant is connected, specifically, the rotary hearth furnace includes：Rotary hearth furnace furnace chamber, ring-shaped furnace bottom and Exhanst gas outlet, wherein, the ring-shaped furnace bottom is rotatably arranged in the rotary hearth furnace furnace chamber bottom, and the rotary hearth furnace furnace chamber is circumferentially It is divided into feed zone, reducing zone and discharge zone, the feed zone is provided with the first distribution device and the second distribution device, first cloth Material device is connected with the outlet of lateritic nickel ore carbonaceous pelletizing, and second distribution device is connected with the outlet of chromite carbonaceous pelletizing, institute State the first distribution device and lateritic nickel ore carbonaceous pelletizing is layered on lower floor, chromite carbonaceous pelletizing is layered on by second distribution device Upper strata；The discharge zone is provided with rotary hearth furnace discharging device, by the chromite carbonaceous pelletizing of big particle diameter and the lateritic nickel ore of small particle Carbonaceous pelletizing mixing reduction, obtains mixing reducting pellet.

According to embodiment of the present utility model, shown in reference picture 2, the 3rd screening plant is connected with the rotary hearth furnace, Specifically, the 3rd screening plant includes：Mix reducting pellet entrance 601, chromite reducting pellet outlet 602 and laterite nickel Ore deposit reducting pellet outlet 603, the mixing reducting pellet entrance is connected with the rotary hearth furnace discharging device, for mixing to be reduced Pelletizing carries out screening process, and lateritic nickel ore reducting pellet and chromite also protocorm are respectively obtained according to the particle size differences of two kinds of pelletizings Group.

According to some embodiments of the utility model, due to subsequently using different handling process to two kinds of reducting pellets, Obtained after reduction two kinds of mixing pelletizings need to be separated, it requires that chromite and lateritic nickel ore pelletizing have different particle diameters； And in reduction process, because chromite is difficult to reduce, high is required to reduction temperature, so chromite pelletizing has been layered on into laterite The upper strata of nickel ore pellet, temperature are successively decreased layer by layer during lateritic nickel ore is transferred to by chromite.Chromite is made for selection Big particle diameter pelletizing >=18mm, can so make that certain space can be left between chromite pelletizing and pelletizing, and will not be crossed diameter Too small pelletizing fills up space, and such bed of material is designed with the conduction between the chromite bed of material beneficial to heat, and thermal loss is few, More heats can be made to reach the lateritic nickel ore bed of material, and do not influence the reduction effect of chromite, energy utilization rate is high.

According to embodiment of the present utility model, shown in reference picture 2, the ferro-nickel product generating means and the described 3rd screening Device is connected, specifically, the ferro-nickel product generating means include：Lateritic nickel ore reducting pellet entrance 701, ferro-nickel product outlet 702 and mine tailing outlet 703, the lateritic nickel ore reducting pellet entrance and the lateritic nickel ore reducting pellet, which export, to be connected, will be red Native nickel minerals reducting pellet carries out physical separation, obtains ferro-nickel product and mine tailing.

According to embodiment of the present utility model, shown in reference picture 2, the ferrochrome product generating means and the described 3rd screening Device is connected, specifically, the ferrochrome product generating means include：Chromite reducting pellet entrance 801, ferrochrome product outlet 802 and ferrochrome slag outlet 803, the outlet of the chromite reducting pellet entrance and the chromite reducting pellet is connected, for general Chromite reducting pellet carries out high melt, obtains ferrochrome product.

According to some embodiments of the utility model, the specific species of ferrochrome product generating means described in the utility model is not It is restricted, the utility model is preferably：Electric furnace or mineral hot furnace.

According to some embodiments of the utility model, system described in the utility model improves existing DRC pretreatment work Skill, obtain going back by-product lateritic nickel ore reducting pellet while chromite reducting pellet, two kinds of pelletizings are by being separated Afterwards, two kinds of different subsequent treatment process be have selected：Chromite reducting pellet carries out high melt, obtains ferrochrome；Laterite It is the ferro-nickel product that can obtain high value that nickel minerals reducting pellet, which then need to only pass through simple physical separation, is not required to carry out high temperature melting Refining, process energy consumption are low.

In another aspect of the present utility model, it is proposed that a kind of system using foregoing raising rotary hearth furnace production capacity is entered The method that row improves rotary hearth furnace production capacity, Fig. 1 are the flow chart of the utility model method, shown in reference picture 1, are comprised the following steps：

（1）Lateritic nickel ore, the first reducing agent, the first additive and water are added into the first ball and drying unit processed to be mixed Close, ball processed and drying, obtain lateritic nickel ore ball product.

（2）Lateritic nickel ore ball product is added into the first screening plant, after first circulation loop sieve repeatedly To the lateritic nickel ore carbonaceous pelletizing that particle diameter is 5-16mm.

（3）Chromite, the second reducing agent, Second addition and water the second ball and drying unit processed of addition are mixed, Ball processed and drying, obtain chromite ball product.

According to some embodiments of the utility model, the first reducing agent and the second reducing agent described in the utility model be coal, One or more in semi-coke, carbon black.

（4）Chromite ball product is added into the second screening plant, obtained after second circulation loop sieve repeatedly Particle diameter >=18mm chromite carbonaceous pelletizing.

According to some embodiments of the utility model, the chromite that the utility model chromite is made larger granularity is carbon containing Pelletizing, lateritic nickel ore is made to the lateritic nickel ore carbonaceous pelletizing of smaller particle size, will easily be reduced using rotary hearth furnace double cloth systems Lateritic nickel ore carbonaceous pelletizing is evenly arranged on the furnace bottom of rotary hearth furnace, then the chromite carbonaceous pelletizing of hardly possible reduction is covered in into laterite The upper strata of nickel ore pellet, in reduction process, using chromite and lateritic nickel ore to the different demands of reduction temperature, produce fuel Raw heat energy by radiant heat transfer mode in Different layer of the compost by cascade utilization to greatest extent, so as to complete to chromite and laterite The reduction of nickel minerals, after the screened processing of mixing reducting pellet for discharging rotary hearth furnace, both can be realized according to the difference of pelletizing particle diameter Efficiently separate, respectively obtain chromite reducting pellet and lateritic nickel ore reducting pellet.

（5）The rotary hearth furnace reduction temperature range be 1300-1500 DEG C under conditions of, by lateritic nickel ore carbonaceous pelletizing by First distribution device is distributed into the rotary hearth furnace, and chromite carbonaceous pelletizing is distributed into the rotary hearth furnace by the second distribution device, described The chromite carbonaceous pelletizing of big particle diameter is laid on the upper strata of the lateritic nickel ore carbonaceous pelletizing of small particle, rotates and reduces through ring-shaped furnace bottom After reacting 20-80min, chromite reducting pellet and lateritic nickel ore reducting pellet are reduced into respectively, and via the rotary hearth furnace Drawing mechanism discharge mixing reducting pellet.

（6）Mixing reducting pellet is added into the 3rd screening plant and carries out screening process, respectively obtains the different ferrochrome of particle diameter Ore deposit reducting pellet and lateritic nickel ore reducting pellet.

（7）The chromite reducting pellet is sent into ferrochrome product generating means and carries out high melt, obtain ferrochrome product and Ferrochrome slag；The lateritic nickel ore reducting pellet is passed through ferro-nickel product generating means and carries out physical separation, obtains ferro-nickel product and tail Ore deposit.

According to some embodiments of the utility model, system described in the utility model improves existing DRC pretreatment work Skill, obtain going back by-product lateritic nickel ore reducting pellet while chromite reducting pellet, two kinds of pelletizings are by being separated Afterwards, two kinds of different subsequent treatment process be have selected：Chromite reducting pellet carries out high melt, obtains ferrochrome；Laterite It is the ferro-nickel product that can obtain high value that nickel minerals reducting pellet, which then need to only pass through simple physical separation, is not required to carry out high temperature melting Refining, process energy consumption are low.

According to some embodiments of the utility model, the mode of physical separation described in the utility model can be broken, mill One or more in ore deposit, magnetic separation, jigging sorting.

Embodiment 1：Lateritic nickel ore, semi-coke, lime stone and water are carried out according to a certain percentage dispensing, it is well mixed after with circle Disk pelletizer pelletizing, pelletizing diameter 6-15mm, wherein lateritic nickel ore Ni grades are 1.0%, and the addition of semi-coke needs to be theoretical 1 times of amount, lime stone is added to the 5% of lateritic nickel ore weight, and the lateritic nickel ore carbonaceous pelletizing made, which is sent into dryer, is dried Processing；Chromite, coal, additive and water are carried out according to a certain percentage dispensing, it is well mixed after use disc balling machine pelletizing, ball The a diameter of 18-28mm of group, the chromite carbonaceous pelletizing made are sent into dryer and carry out drying and processing, obtain the chromium that moisture is less than 3% Iron ore dries pelletizing；Lateritic nickel ore carbonaceous pelletizing is distributed into rotary hearth furnace by the first distribution device, by chromite carbonaceous pelletizing by Two distribution devices are distributed into rotary hearth furnace, and chromite carbonaceous pelletizing is layered on upper strata, and lateritic nickel ore carbonaceous pelletizing is layered on lower floor, bed of material total thickness About 45-60mm is spent, the highest reduction temperature of rotary hearth furnace is 1420 DEG C, and recovery time 60min, pelletizing obtains after rotary hearth furnace reduction Reducting pellet is mixed, its granularity is slightly reduced carbonaceous pelletizing after carrying out reduction；It is 16mm's that pelletizing, which will be mixed, and be sent into sieve diameter Screening plant, efficiently separating for chromite reducting pellet and lateritic nickel ore reducting pellet is realized, sieve obtained chromite reduction The reduction degree of pelletizing chromium is more than 60%, and pelletizing is sent into after electric furnace progress pyrolytic semlting to the ferrochrome being easy to get to chromium content more than 60% and closed Golden product, the reduction degree of iron is about 68% in the lateritic nickel ore reducting pellet after screening, and nickel reduction degree is 100%, by lateritic nickel ore Reducting pellet is sent into after mill ore magnetic selection carries out simple physical sorting and obtains powdery ferro-nickel product, product nickel grade 5.2%, as not Steel smelting nickel source of becoming rusty uses, and value of the product is high.

Embodiment 2：Lateritic nickel ore, coal, lime stone and water are carried out to dispensing, well mixed rear pelletizing according to a certain percentage, Pelletizing diameter is 1.6% in 8-16mm, wherein the Ni grades of lateritic nickel ore, and the addition of coal is 1.2 times of theoretical requirement, stone Lime stone is added to the 10% of lateritic nickel ore weight, and the lateritic nickel ore carbonaceous pelletizing made is sent into dryer and carries out drying and processing；By chromium Iron ore, coal, additive and water carry out dispensing, well mixed rear pelletizing according to a certain percentage, a diameter of 18-30mm of pelletizing, make Pelletizing be sent into dryer carry out drying and processing；The lateritic nickel ore carbonaceous pelletizing of drying is distributed into by the first distribution device and turns bottom Stove, chromite carbonaceous pelletizing is distributed into rotary hearth furnace by the second distribution device, chromite pelletizing is layered on upper strata, lateritic nickel ore pelletizing paving In lower floor, bed of material gross thickness is the thickness of 6 layers of pelletizing, and about 65-80mm, the highest reduction temperature of rotary hearth furnace is 1480 DEG C, reduction Time 40min, pelletizing obtain rotary hearth furnace discharging pelletizing mixture mixing reducting pellet after rotary hearth furnace reduction, mixing pelletizing are sent Enter the screening plant that sieve diameter is 17mm, realize efficiently separating for chromite reducting pellet and lateritic nickel ore reducting pellet, sieve The reduction degree 72% for the chromite reducting pellet chromium got, it is easy to get after pelletizing feeding mineral hot furnace is smelted to ferrochrome Product.The reduction degree of iron is 55% in lateritic nickel ore reducting pellet after screening, and nickel reduction degree is 100%, and pelletizing is crushed into 3mm Carry out jigging sorting afterwards, obtain ferronickel granule and tailings, tailings obtains ferronickel powder and mine tailing after mill ore magnetic selection again, by ferronickel granule and Ferronickel powder can use as comprehensive ferro-nickel product as the nickel source of smelting stainless steel.

Inventor has found, according to the system of raising rotary hearth furnace production capacity described in the utility model, makes chromite and laterite nickel The particle size of ore deposit carbonaceous pelletizing is different, and chromite carbonaceous pelletizing particle diameter is more than lateritic nickel ore carbonaceous pelletizing, and then makes ferrochrome Certain space can be left between ore deposit pelletizing and pelletizing, and the too small pelletizing of diameter will not be crossed and fill up space, such material Layer is designed with the conduction beneficial to heat between the chromite bed of material, and thermal loss is few, and more heats can be made to reach lateritic nickel ore material Layer, and the reduction effect of chromite is not influenceed, energy utilization rate is high；Also, lateritic nickel ore reducting pellet of the present utility model and The subsequent treatment process of chromite reducting pellet is different, the technique for improving the DRC of existing processing chromite, is obtaining ferrochrome also By-product lateritic nickel ore also original product while original product, lateritic nickel ore also original product only need to be through simple physical separation afterwards Ferro-nickel product is obtained, improves added value of product；Simultaneously using the different reduction characteristics of different type raw material, rotary hearth furnace is realized Deep bed sintering cloth, improve energy utilization rate, increase rotary hearth furnace production capacity, rotary hearth furnace reduction process realizes deep bed sintering cloth, heat It can improve energy utilization rate in Different layer of the compost by cascade utilization to greatest extent, increase rotary hearth furnace production capacity, so as to reduce Process energy consumption and cost；In addition, chromite carbonaceous pelletizing balling property is good, pellet strength is high；And reducing agent is with addition of reasonable, also Chromite pelletizing after original occurs without powder phenomenon-tion, chromite reducting pellet and lateritic nickel ore reducting pellet after rotary hearth furnace reduction Both efficiently separate can be realized according to the difference of pelletizing particle diameter.

In the utility model, unless otherwise clearly defined and limited, the term such as term " connected ", " connection " should be done extensively Reason and good sense solution, for example, it may be fixedly connected or be detachably connected, or integrally；Can mechanically connect, can also It is electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, can be two element internals connection or The interaction relationship of two elements.For the ordinary skill in the art, can understand as the case may be above-mentioned Concrete meaning of the term in the utility model.

In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description Point is contained at least one embodiment or example of the present utility model.In this manual, to the schematic table of above-mentioned term Identical embodiment or example need not be directed to by stating.Moreover, specific features, structure, material or the feature of description can be Combined in an appropriate manner in any one or more embodiments or example.In addition, in the case of not conflicting, this area Technical staff can be carried out the different embodiments or example and the feature of different embodiments or example described in this specification With reference to and combination.

Although embodiment of the present utility model has been shown and described above, it is to be understood that above-described embodiment is Exemplary, it is impossible to it is interpreted as to limitation of the present utility model, one of ordinary skill in the art is in the scope of the utility model It is interior above-described embodiment to be changed, changed, replaced and modification, meanwhile, for those of ordinary skill in the art, foundation The thought of the application, in specific embodiments and applications there will be changes.

Claims (7)

1. A kind of 1. system for improving rotary hearth furnace production capacity, it is characterised in that including：First ball and drying unit processed, the first screening dress Put, the second ball and drying unit processed, the second screening plant, rotary hearth furnace, the 3rd screening plant, ferro-nickel product generating means and ferrochrome Product generating means, wherein,

   First ball and drying unit processed interconnect with first screening plant, for sieving to obtain lateritic nickel ore repeatedly Carbonaceous pelletizing；

   Second ball and drying unit processed and second screening plant interconnect, and contain for sieving to obtain chromite repeatedly Carbon pellets；

   Rotary hearth furnace with double cloth systems is connected with first screening plant and the second screening plant respectively, for by big grain The chromite carbonaceous pelletizing in footpath mixes reduction with the lateritic nickel ore carbonaceous pelletizing of small particle；

   3rd screening plant is connected with the rotary hearth furnace, for the particle size differences according to two kinds of pelletizings to the pelletizing after reduction Sieved, respectively obtain lateritic nickel ore reducting pellet and chromite reducting pellet；

   The ferro-nickel product generating means are connected with the 3rd screening plant, and lateritic nickel ore reducting pellet is carried out into physics point Choosing, obtains ferro-nickel product and mine tailing；

   The ferrochrome product generating means are connected with the 3rd screening plant, and chromite reducting pellet is carried out into high melt, Obtain ferrochrome product.
2. 2. the system according to claim 1 for improving rotary hearth furnace production capacity, it is characterised in that first ball processed and drying dress Put including：Lateritic nickel ore entrance, the first reducing agent entrance, the first additive entrance, the first water inlet, lateritic nickel ore returning charge entrance With lateritic nickel ore ball products export, first screening plant includes：Lateritic nickel ore ball product inlet, lateritic nickel ore returning charge Outlet, the outlet of lateritic nickel ore carbonaceous pelletizing, first ball and drying unit processed and first screening plant are connected to form the One circulation loop, the first circulation loop are：The lateritic nickel ore ball product inlet and the lateritic nickel ore ball product Outlet is connected, and lateritic nickel ore returning charge outlet is connected with lateritic nickel ore returning charge entrance, for lateritic nickel ore ball product to be sieved repeatedly Get the lateritic nickel ore carbonaceous pelletizing that particle diameter is 5-16mm.
3. 3. the system according to claim 2 for improving rotary hearth furnace production capacity, it is characterised in that second ball processed and drying dress Put including：Chromite entrance, the second reducing agent entrance, Second addition entrance, the second water inlet, chromite returning charge entrance and chromium Iron ore ball products export, second screening plant include：Chromite ball product inlet, chromite returning charge outlet, ferrochrome Ore deposit carbonaceous pelletizing exports, and second ball and drying unit processed are connected to form second circulation loop with second screening plant, The second circulation loop is：The chromite ball product inlet is connected with the lateritic nickel ore ball products export, ferrochrome Ore deposit returning charge outlet is connected with chromite returning charge entrance, and particle diameter >=18mm is obtained for chromite ball product to be carried out into screening repeatedly Chromite carbonaceous pelletizing.
4. 4. the system according to claim 1 for improving rotary hearth furnace production capacity, it is characterised in that have double cloth systems turns bottom Stove includes：Rotary hearth furnace furnace chamber, ring-shaped furnace bottom and exhanst gas outlet, wherein, the ring-shaped furnace bottom is rotatably arranged in the rotary hearth furnace Furnace chamber bottom, the rotary hearth furnace furnace chamber are circumferentially divided into feed zone, reducing zone and discharge zone, and the feed zone is provided with the first cloth Device and the second distribution device, first distribution device are connected with the outlet of lateritic nickel ore carbonaceous pelletizing, the second cloth dress To put and be connected with the outlet of chromite carbonaceous pelletizing, lateritic nickel ore carbonaceous pelletizing is layered on lower floor by first distribution device, and described the Chromite carbonaceous pelletizing is layered on upper strata by two distribution devices；The discharge zone is provided with rotary hearth furnace discharging device, for being mixed Reducting pellet.
5. 5. the system according to claim 4 for improving rotary hearth furnace production capacity, it is characterised in that the 3rd screening plant bag Include：Mix reducting pellet entrance, the outlet of chromite reducting pellet and the outlet of lateritic nickel ore reducting pellet, the mixing reducting pellet Entrance is connected with the rotary hearth furnace discharging device, for mixing reducting pellet to be carried out into screening process, respectively obtains particle diameter difference Chromite reducting pellet and lateritic nickel ore reducting pellet.
6. 6. the system according to claim 1 for improving rotary hearth furnace production capacity, it is characterised in that the ferro-nickel product generating means Including：Lateritic nickel ore reducting pellet entrance, ferro-nickel product outlet and mine tailing outlet, the lateritic nickel ore reducting pellet entrance and institute State lateritic nickel ore reducting pellet outlet be connected, for by lateritic nickel ore reducting pellet carry out physical separation, obtain ferro-nickel product and Mine tailing.
7. 7. the system according to claim 1 for improving rotary hearth furnace production capacity, it is characterised in that the ferrochrome product generating means Including：Chromite reducting pellet entrance, ferrochrome product outlet and ferrochrome slag outlet, the chromite reducting pellet entrance with it is described The outlet of chromite reducting pellet is connected, and for chromite reducting pellet to be carried out into high melt, obtains ferrochrome product.