CN106636670A - System and method for preparing ferronickel from laterite-nickel ore - Google Patents

Abstract

The invention provides a system and a method for preparing ferronickel from laterite-nickel ore, belongs to the field of metal smelting, and solves the problems of difficulties in transporting, drying and crushing of the high-moisture raw laterite-nickel ore as well as the easiness in ringing and difficulty in reducing, caused by pelletizing difficulty. The method comprises the following steps of 1), pretreating the raw materials; 2) pelletizing; 3) implementing magnetizing roast and water quenching; and 4) grinding the ore, and implementing dry-separation. By means of the system and the method, the problems can be effectively solved, the consumption of electric power and water in the process of grinding and magnetic separation of the laterite-nickel ore roasted ore is reduced, and the piling risk of low tailings is reduced.

Description

A kind of lateritic nickel ore prepares the system and method for ferronickel

Technical field

The invention belongs to metal smelt field, more particularly to a kind of lateritic nickel ore prepares the system and method for ferronickel.

Background technology

Lateritic nickel ore raw ore is aqueous general 35% or so, nickeliferous in 0.5%-2.4%, the drying of raw ore, comminution energy conssumption compared with Height, and due to the viscosity of lateritic nickel ore, causes lateritic nickel ore in drying, the conveying of shattering process is also extremely difficult, go wrong frequently.

Prior art is to use quick lime premixing, then with apron feeder forced feeding to rod-toothed crusher, after crushing Lateritic nickel ore granularity about in 200-400mm, is transported to monotubular dryer and is dried through belt conveyor, and hot blast is by coal-fired Hot-blast stove is supplied（800 DEG C of wind-warm syndrome of outlet）, the material after drying（Aqueous 10% or so）It is transported to hammer through belt conveyor again Disintegrating machine, kibbler roll carry out two-stage and crush, and are sieved with sieve afterwards, and the material more than 3mm is again by Belt Conveying Machine is transmitted back to kibbler roll and is crushed, and enters dispensing storehouse less than 3mm materials stand-by.

Mix into batch mixer through the material of dispensing and the adjustment moisture that adds water is to 17%, be pressed into ball press afterwards The oval pellet of 25mm × 35mm × 50mm, through drying naturally（Moisture is high, and pellet is big, and directly entering kiln can burst）, use machine Tool is fed into calcined by rotary kiln.

Through the roasted ore calcined（Granularity is about in 10--100mm）The thin hammer crushing of one-level is transported to apron feeder Machine, the raw meal particle size after one-level is broken is transported to two grades of oppositely rolling roller crushers about in 0--30mm, then through belt conveyor Crushed, the material after two-stage crushing is sieved into sieve, the material of >=3mm returns secondary breaker and crushes again, The percutaneous band conveyer of the material of ＜ 3mm sends into wet ball mill carries out ore grinding, below material grinding to -200 mesh into three-level Magnetic separation carries out ore dressing.Fine ore enters the accumulating of concentrate storehouse after ceramic filter dehydration.Mine tailing will send through precipitation, after filtering Enter Tailings Dam storage.The process consumes in a large number fresh water, and power consumption is higher, and tailings impoundment has high demands, risk is big.

The patent for preparing ferronickel with regard to lateritic nickel ore at present also has a lot, such as application number：201510422624.7、 201610152760.3 and the patents such as 201410444219.0.As can be seen that it prepares work from above-mentioned several application texts Skill keeps up with that the preparation technology that review states is similar substantially, and its Feedstock treating process is substantially and first lateritic nickel ore is carried out broken baking It is dry, raw material mixing pressure ball is then carried out again, pelletizing size is in 25mm × 35mm × 50mm or so, and its mill ore magnetic selection process is basic Using wet-treating.

Existing Feedstock treating process, due to the humidity of lateritic nickel ore it is higher, in conveying, drying, broken, screening process In, often occur gluing stifled problem, " sandwich " of the bulk materials in drying course（Dry tack free crusts, and the inside is still wet It is viscous）Problem and drying after material because moisture it is higher（Aqueous 17% or so）The thinner problem that can not be crushed.Existing Feedstock treating Process causes pressed pellet diameter too big, and so as to cause pelletizing to enter, kiln blow-up rate is higher, and percent reduction is low.In addition, existing ore grinding Wet-treating process needs to consume a large amount of fresh water and power consumption is higher, and tailings impoundment has high demands, risk is big.

The content of the invention

The present invention overcomes the shortcomings of that prior art is present, and the conveying for solving high-moisture lateritic nickel ore raw ore is difficult, dries difficult, broken Be difficult to and caused by pelletizing is difficult preferably ring formation, the problems such as reduction is difficult, it is desirable to provide a kind of lateritic nickel ore prepares the system of ferronickel and side Method, the system and method can effectively solve the problem that the problems referred to above, while during ore grinding, the magnetic separation of reduction roasting lateritic nickel ore ore deposit Power consumption, water consume, and lower mine tailing and store up risk.

To solve above-mentioned technical problem, the technical solution used in the present invention is：The system that a kind of lateritic nickel ore prepares ferronickel, Including raw ore preparation facilities, magnetizing roasting device and dry separation device, the raw ore preparation facilities include run coal bin, nickel minerals feed bin and Auxiliary material storehouse, run coal bin, nickel minerals feed bin and auxiliary material storehouse are connected to send into raw material by belt conveyor with drying crusher dries Dry disintegrating machine, the discharging opening of drying crusher is connected with mill separator, and the meal outlet of mill separator is broken with drying The charging aperture of machine is connected, and the outlet of its fine powder is connected with the import of cyclone dust collectors, the first outlet of cyclone dust collectors and the Waste residue is transported to spoil area by the connection of one dust-precipitator, and the second outlet of cyclone dust collectors is connected by transmitting device with acceptable material storehouse Logical, acceptable material storehouse is connected by governing belt balance with biaxial rneader, and the outlet of biaxial rneader is connected with disc balling machine, Qualified pellet is sent into pellet storehouse by disc balling machine by roller bearing screening machine distribution device；

The magnetizing roasting device includes constant feeder, and pellet storehouse is connected, set on rotary kiln by constant feeder with rotary kiln High-temperature blower and coal injection pipe are equipped with, the material outlet of rotary kiln is connected with dragveyer, dragveyer is by conveying arrangement and middle material Storehouse connects；

The dry separation device includes apron feeder and elevator, and apron feeder and elevator connect intermediate bunker and roll squeezer Connect, tramp iron separator is additionally provided between the elevator and roll squeezer, the discharging opening of roll squeezer is connected with V-type powder concentrator, and V-type selects powder The meal outlet of machine is connected with feeding of roll squeezer mouth, and the fine powder of V-type powder concentrator is exported and apparatus for separating fine powder from coarst powder, apparatus for separating fine powder from coarst powder Meal outlet connect with storage silo by cyclone cylinder, the fine powder of apparatus for separating fine powder from coarst powder is exported and passes through the second dust-precipitator and tailing bin Storehouse connects, and the bottom of storage silo is provided with discharger, and discharger is connected by belt conveyor with dry-type magnetic extractor, dry type magnetic separation Machine is connected by concentrate belt with finished bin.

Further, hot wind inlet is provided with the drying crusher, hot wind inlet is connected with crusher chamber, and hot blast enters The external rotary kiln exhaust gas discharge conduit of mouth.

Further, the roll squeezer adopts high-pressure roller mill, dry-type magnetic extractor to adopt two-stage dry-type magnetic extractor.

Further, a kind of method that lateritic nickel ore prepares ferronickel, follows the steps below：

Step 1）Pretreatment of raw material：Lateritic nickel ore and relevant auxiliary materials are sent into after batching by belt conveyor and is dried Dry disintegrating machine, while being passed through high-temp waste gas, completes batch mixing and crushes simultaneously in drying crusher, and high-temp waste gas send into material Mill separator, then enters acceptable material storehouse using sorting scummer by the larger material collection of iron content nickel proportion；

Step 2）Pelletizing process：Raw material in acceptable material storehouse is added water and is mixed after agitated machine stirring, send into pelletizer, pelletizing Mixed raw material is made pelletizing by machine；

Step 3）Magnetizing roast, water quenching：Pelletizing made by last step is sent in rotary kiln carries out magnetizing roast, has fired Material into after is discharged from rotary kiln, and the material after roasting enters water immersion type scraping board slag conveyor anaerobic in the state of hermetically sealed It is cooled to normal temperature；

Step 4）Ore grinding, dry separation：Material after Water Quenching is sent into into high-pressure roller mill, the material Jing after grinding sends into V Type powder concentrator, meal returns high-pressure roller mill mechanical lapping, and fine powder sends into apparatus for separating fine powder from coarst powder and carries out secondary cyclone process, do not contain The less fine powder of the proportions such as the gangue of ferronickel is collected into the second dust-precipitator be discharged into Tailings Dam with the wind, the material Jing containing ferronickel Collect from cyclone cylinder bottom warehouse-in and store, Jing bottoms of the reservior discharger and belt conveyor send into two-stage dry-type magnetic extractor ore dressing, ferronickel Essence is divided into storehouse accumulating, and directly discharge is transported to Tailings Dam to waste residue.

Further, in pretreatment of raw material, high-temp waste gas send into the water content of the material of mill separator<5%, diameter is little In 1mm.

Further, pelletizing made by during pelletizing is processed is through roller bearing screening machine distribution device by a diameter of 10-15mm's Pelletizing sends into pellet storehouse.

Further, step 4）Mesohigh roller mill is milled to material below 120 mesh.

Further, the temperature of high-temp waste gas is 400 DEG C -500 DEG C.

Further, step 3）The specification of middle rotary kiln 22：Diameter 4-4.5m, length 80-90m.

The present invention compare with prior art have the advantage that for.

1st, preprocessing process of the invention, changes the process that original nickel ores first dry broken batch mixing again, by drying, breaks It is broken to be combined as a whole, multiple stage crushing, multistage turn of material, multiple blanking airborne dust points are changed into into primary fragmentation, closed circuit operation, be conducive to Environmental protection, the preprocessing process of the present invention drives material movement using high-temperature flue gas, solves high humility（35%）It is red Viscous, stifled problem of the native nickel minerals in conveying, broken, screening process, while can solve the problem that " folder of the bulk materials in drying course The heart " problem, can be broken tup opening after material caking, continue to dry.

2nd, the present invention is according to the different characteristic of the proportion of material, process exclusive segment gangue, the waste residue gathered dust using selection by winnowing, Reduce into kiln material, reducing energy consumption, improve yield.And outlet material fineness can according to demand be adjusted using apparatus for separating fine powder from coarst powder Section（General control ＜ 1mm）, effectively in the ballability and reducing property that improve material.

3rd, the present invention adopts pelletizer, changes the technique that original use ball press makes pelletizing, reduces pellet grain Footpath and moisture, so as to reduce pellet kiln blow-up rate is entered, and improves percent reduction；Reduce ring formation, improve running rate.Adopt major diameter simultaneously Rotary kiln, reducing atmosphere roasting directly magnetize, and reduce power consumption, prevent ring formation, improve efficiency.

4th, it is dry milling that the present invention changes wet grinding, without fresh water.Not only saving water resource, and cancel concentrate and Tailing filtration is dehydrated facility, substantially reduces investment, and reduces tailings impoundment risk.Ball mill is changed into into roller mill, product per ton Product grinding pow consumption is reduced to 20 degree or so by 40 degree or so.Part is removed using selection by winnowing（About 15%）Gangue waste residue, reduces magnetic separator Load, improve beneficiating efficiency.

Description of the drawings

Below in conjunction with the accompanying drawings the present invention will be further described in detail.

Fig. 1 is the technology arrangement figure that a kind of lateritic nickel ore of the present invention prepares ferronickel.

Fig. 2 is the technology arrangement detail drawing that a kind of lateritic nickel ore of the present invention prepares ferronickel.

Specific embodiment

It is understandable to enable objects, features and advantages of the present invention to become apparent from, below in conjunction with the accompanying drawings to the tool of the present invention Body embodiment is described in detail.

Fig. 1 is refer to, Fig. 1 is the technology arrangement figure that a kind of lateritic nickel ore provided by the present invention prepares ferronickel, according to work Skill layout drawing, is described below in detail the system that whole lateritic nickel ore prepares ferronickel.

The system that a kind of lateritic nickel ore prepares ferronickel, including the raw ore preparation facilities 1, magnetizing roasting device 2 that set gradually With dry separation device 3.

Specifically, the raw ore preparation facilities 1 includes run coal bin 11, nickel minerals feed bin 12 and auxiliary material storehouse 13, nickel minerals feed bin 12 Lateritic nickel ore is sent into by nickel minerals feed bin 12 using stacker-reclaimer, run coal bin 11, nickel minerals feed bin 12 and auxiliary material storehouse 13 pass through belt Conveying device 14 is connected with drying crusher 15 sends raw material into drying crusher 15, the discharging opening and meal of drying crusher 15 Separator is connected 16, and the meal outlet of mill separator is connected with the charging aperture of drying crusher 15, its fine powder outlet and The import of cyclone dust collectors 17 is connected, and the first outlet of cyclone dust collectors 17 is connected with the first dust-precipitator 18 and is transported in waste residue Spoil area 19, the second outlet of cyclone dust collectors 17 is connected by transmitting device with acceptable material storehouse 110, acceptable material storehouse 110 It is connected with biaxial rneader 112 by governing belt balance 111, the outlet of biaxial rneader 112 is connected with disc balling machine 113, Qualified pellet is sent into pellet storehouse 115 by disc balling machine 113 by roller bearing screening machine distribution device 114.

This raw ore prepares to fill 1 and put and drying and shattering process is integrated in drying crusher 15, and material and hot blast is same When send into large cavity hammer mill in, with tup open lump material, it is to avoid " sandwich "（Surface crust, the inside is wet viscous）；Together When drive material with a large amount of high-temperature flue gas, it is to avoid it is viscous, stifled；And powder material is taken away in time, improve drying efficiency.And using rotation Wind deduster 17 according to the different characteristic of the proportion of material, process exclusive segment gangue, the waste residue gathered dust using selection by winnowing, reduce into Kiln material, reducing energy consumption improves yield.

In addition, by introducing pelletizer, changing the process that original utilization pelletizer produces pelletizing, the ball of pelletizer production , substantially in 12mm or so, pellet is little and uniform and stable, and water content is low for group's size, and so as to reduce pellet kiln blow-up rate is entered, and improves also Former rate；Reduce ring formation, improve running rate.

Specifically, the magnetizing roasting device 2 includes constant feeder 21, and constant feeder 21 is by pellet storehouse 115 and returns Rotary kiln 22 is connected, and high-temperature blower 221 and coal injection pipe 222, the material outlet and dragveyer of rotary kiln 22 are provided with rotary kiln 22 23 connections, dragveyer 23 is connected by conveying arrangement 24 with intermediate bunker 25.

Specifically, the dry separation device 3 includes apron feeder 31 and elevator 32, apron feeder 31 and elevator 32 Intermediate bunker 25 is connected with roll squeezer 34, tramp iron separator 33, roll squeezer are additionally provided between the elevator 32 and roll squeezer 34 34 discharging opening is connected with V-type powder concentrator 35, and the meal outlet of V-type powder concentrator 35 is connected with the charging aperture of roll squeezer 34, and V-type selects powder Fine powder outlet and the apparatus for separating fine powder from coarst powder 36 of machine 35, the meal outlet of apparatus for separating fine powder from coarst powder 36 is by cyclone cylinder 37 and storage silo 38 Connection, the fine powder outlet of apparatus for separating fine powder from coarst powder 36 is connected by the second dust-precipitator 313 with the storehouse of tailing bin 314, the bottom of storage silo 38 Portion is provided with discharger 39, and discharger 39 is connected by belt conveyor 310 with dry-type magnetic extractor 311, and dry-type magnetic extractor 311 leads to Cross concentrate belt to be connected with finished bin 312.

The lateritic nickel ore of the present invention prepares the process that the system of ferronickel changes original wet magnetic separation, and creativeness adopts dry separation System, by the lump material after reduction roasting, Water Quenching high-pressure roller mill is sent directly into, and using high-pressure roller mill dry type is carried out Grinding, sends into V-type powder concentrator 35, and fine powder directly brings with the wind apparatus for separating fine powder from coarst powder 36 into, and meal enters high pressure roller mill, through powder The boosted machine 32 of material of mill enters V-type powder concentrator 35.Equally, meal returns high pressure roller mill, and fine powder brings with the wind thickness powder into Separator 36, separates through secondary cyclone, and the less fine powder of proportion such as gangue without ferronickel enters with the wind the second dust-precipitator 313 Collection is discharged into Tailings Dam, and the material Jing containing ferronickel is collected from the bottom of cyclone cylinder 37 warehouse-in and stored, the He of Jing bottoms of the reservior discharger 39 Belt conveyor 310 sends into the ore dressing of two-stage dry-type magnetic extractor 311, and ferronickel essence is divided into storehouse accumulating, and directly discharge is transported to tail to waste residue Ore deposit storehouse.

This dry separation system high pressure roller mill, without water, once below material grinding to -200 mesh, saves electricity Consumption and water resource, product grinding pow consumption per ton is reduced to 20 degree or so by 40 degree or so.

In order that drying crusher 15 is applicable in the system, it is provided with hot blast on the drying crusher 15 and enters Mouthful, hot wind inlet is connected with crusher chamber, the external exhaust gas discharge conduit of rotary kiln 22 of hot wind inlet.More than effectively utilizes kiln tail gas Heat, reduces comprehensive energy consumption.

Preparing the system of ferronickel to lateritic nickel ore above has carried out complete description, concrete below by different embodiments The method that elaboration prepares ferronickel using the system.

Embodiment one

The method is followed the steps below：

Step 1）Pretreatment of raw material：Lateritic nickel ore and relevant auxiliary materials are sent into after batching by belt conveyor 14 Drying crusher 15, while being passed through high-temp waste gas, completes batch mixing and crushes simultaneously in drying crusher 15, and high-temp waste gas will reach To below 1mm and moisture<5% material sends into mill separator, by material that iron content nickel proportion is larger after mill separator Collect and enter acceptable material storehouse 110.

Step 2）Pelletizing process：Raw material in acceptable material storehouse 110 is added water and is mixed after agitated machine stirring, send into pelletizing Mixed raw material is made pelletizing by machine, pelletizer.Pelletizing is through roller bearing screening machine distribution device 114 made by pelletizing process The pelletizing of a diameter of 12mm is sent into into pellet storehouse 115.

Step 3）Magnetizing roast, water quenching：Pelletizing made by last step is sent in rotary kiln 22 carries out magnetizing roast, A diameter of 4m of rotary kiln 22, the length of rotary kiln 22 is 80m, and the material after the completion of firing is discharged from rotary kiln 22, roasting Material afterwards is cooled to normal temperature in the state of hermetically sealed into the anaerobic of water immersion type scraping board slag conveyor 23.

Step 4）Ore grinding, dry separation：Material after Water Quenching is sent into into high-pressure roller mill, the material Jing after grinding send Enter V-type powder concentrator 35, meal returns high-pressure roller mill mechanical lapping, and fine powder is sent into apparatus for separating fine powder from coarst powder 36 and carried out at secondary cyclone The less fine powders of proportion such as reason, the gangue without ferronickel are collected into the second dust-precipitator 313 be discharged into Tailings Dam with the wind, containing nickel The material Jing of iron is collected from the bottom of cyclone cylinder 37 warehouse-in and stored, and Jing bottoms of the reservior discharger 39 and belt conveyor 310 are sent into two-stage and done The ore dressing of formula magnetic separator 311, ferronickel essence is divided into storehouse accumulating, and directly discharge is transported to Tailings Dam to waste residue.

Embodiment two

The present embodiment is 13mm, a diameter of 4.5m of rotary kiln 22 with the particle diameter that the difference of last embodiment is pelletizing, is turned round The length of kiln 22 is 90m.

In sum, lateritic nickel ore of the present invention prepares the system and technique of ferronickel, employs following new technology：1 is By rotary kiln 22, drying and the broken integrated energy saving formula technique for organically combining, using the technique high humility lateritic nickel ore is solved Viscous, stifled problem in conveying, broken, screening process, while " sandwich " problem of bulk materials is solved, and will be multistage broken Broken, multiple transhipment, multiple blanking airborne dust points change into primary fragmentation, closed circuit operation, it is to avoid airborne dust, are conducive to environmental protection.

2 is raw ore selection by winnowing deslagging process, according to the different characteristic of the proportion of material, the process exclusion portion gathered dust using selection by winnowing Sectors stone, waste residue, are reduced into kiln material, reducing energy consumption, improve yield.

3 is minor diameter pelletizing, the direct magnetization technology of major diameter rotary kiln 22, using pelletizing system, reduce pellet particle diameter and Moisture, so as to reduce pellet kiln blow-up rate is entered, and improves percent reduction；Reduce ring formation, improve running rate.Using major diameter rotary kiln 22nd, reducing atmosphere roasting directly magnetizes, and reduces power consumption, prevents ring formation, improves efficiency.

4th, roasted ore high pressure roller mill dry type end grinding and dry type ore sorting process of enriching, use high pressure roller mill, without water, one It is secondary below material grinding to -200 mesh, save power consumption and water resource.

5th, roasted ore wind-force slagging-off process of enriching, according to the different characteristic of the proportion of material, the process gathered dust using selection by winnowing Exclusive segment gangue, waste residue, are reduced into magnetic separator material, reducing energy consumption, improve yield.

Embodiments of the invention are explained in detail above in conjunction with accompanying drawing, but the present invention is not limited to above-mentioned enforcement Example, in the ken that those of ordinary skill in the art possess, can be with the work on the premise of without departing from present inventive concept Go out various change.Embodiments of the invention are explained in detail above in conjunction with accompanying drawing, but the present invention is not limited to above-mentioned reality Example is applied, in the ken that those of ordinary skill in the art possess, can be with the premise of without departing from present inventive concept Various changes can be made.

Claims (9)

1. the system that a kind of lateritic nickel ore prepares ferronickel, it is characterised in that：Including raw ore preparation facilities（1）, magnetizing roasting device （2）And dry separation device（3）, the raw ore preparation dress（1）Put including run coal bin（11）, nickel minerals feed bin（12）With auxiliary material storehouse（13）, Run coal bin（11）, nickel minerals feed bin（12）With auxiliary material storehouse（13）Pass through belt conveyor（14）With drying crusher（15）Connection Raw material is sent into into drying crusher（15）, drying crusher（15）Discharging opening be connected with mill separator（16）, meal point Meal outlet and drying crusher from device（15）Charging aperture be connected, the outlet of its fine powder and cyclone dust collectors（17）Import It is connected, cyclone dust collectors（17）First outlet and the first dust-precipitator（18）Waste residue is transported to spoil area by connection（19）, rotation Wind deduster（17）Second outlet by transmitting device and acceptable material storehouse（110）Connection, acceptable material storehouse（110）By adjusting Fast belt conveyer scale（111）With biaxial rneader（112）Connection, biaxial rneader（112）Outlet and disc balling machine（113）Even Connect, disc balling machine（113）By roller bearing screening machine distribution device（114）Qualified pellet is sent into into pellet storehouse（115）；

The magnetizing roasting device（2）Including constant feeder（21）, constant feeder（21）By pellet storehouse（115）With rotary kiln （22）Connection, rotary kiln（22）On be provided with high-temperature blower（221）And coal injection pipe（222）, rotary kiln（22）Material outlet with Dragveyer（23）Connection, dragveyer（23）By conveying arrangement（24）With intermediate bunker（25）Connection；

The dry separation device（3）Including apron feeder（31）And elevator（32）, apron feeder（31）And elevator（32） By intermediate bunker（25）With roll squeezer（34）Connection, the elevator（32）And roll squeezer（34）Between be additionally provided with tramp iron separator （33）, roll squeezer（34）Discharging opening and V-type powder concentrator（35）Connection, V-type powder concentrator（35）Meal outlet and roll squeezer （34）Charging aperture is connected, V-type powder concentrator（35）Fine powder outlet and apparatus for separating fine powder from coarst powder（36）, apparatus for separating fine powder from coarst powder（36）It is thick Powder outlet passes through cyclone cylinder（37）With storage silo（38）Connection, apparatus for separating fine powder from coarst powder（36）Fine powder outlet pass through the second dust-precipitator （313）With tailing bin（314）Storehouse connects, storage silo（38）Bottom discharger is installed（39）, discharger（39）By belt Conveyer（310）With dry-type magnetic extractor（311）Connection, dry-type magnetic extractor（311）By concentrate belt and finished bin（312）Even Connect.

2. the system that a kind of lateritic nickel ore according to claim 1 prepares ferronickel, it is characterised in that：The drying crusher （15）On be provided with hot wind inlet, hot wind inlet is connected with crusher chamber, the external rotary kiln of hot wind inlet（22）Waste gas discharge is led to Road.

3. the system that a kind of lateritic nickel ore according to claim 1 and 2 prepares ferronickel, it is characterised in that：The roll squeezer （34）Using high-pressure roller mill, dry-type magnetic extractor（311）Using two-stage dry-type magnetic extractor（311）.

4. a kind of method that lateritic nickel ore prepares ferronickel, it is characterised in that：The method is followed the steps below：

Step 1）Pretreatment of raw material：By lateritic nickel ore and relevant auxiliary materials after batching pass through belt conveyor（14）Send Enter drying crusher（15）, while high-temp waste gas are passed through, in drying crusher（15）It is interior while completing batch mixing and broken, high temperature gives up Material is sent into mill separator by gas, then the larger material collection of iron content nickel proportion is entered into qualified original using sorting scummer Feed bin（110）；

Step 2）Pelletizing process：By acceptable material storehouse（110）In raw material add water after mixing agitated machine stirring, send into pelletizing Mixed raw material is made pelletizing by machine, pelletizer；

Step 3）Magnetizing roast, water quenching：Pelletizing made by last step is sent into into rotary kiln（22）In carry out magnetizing roast, burn Material after the completion of system is from rotary kiln（22）Middle discharge, the material after roasting is dragged in the state of hermetically sealed into immersion type scraper plate Slag machine（23）Anaerobic is cooled to normal temperature；

Step 4）Ore grinding, dry separation：Material after Water Quenching is sent into into high-pressure roller mill, the material Jing after grinding sends into V Type powder concentrator（35）, meal return high-pressure roller mill mechanical lapping, fine powder feeding apparatus for separating fine powder from coarst powder（36）Carry out secondary cyclone Process, the less fine powder of proportion such as gangue without ferronickel enters with the wind the second dust-precipitator（313）Collection is discharged into Tailings Dam, contains The material Jing for having ferronickel is collected from cyclone cylinder（37）Bottom warehouse-in storage, Jing bottoms of the reservior discharger（39）And belt conveyor（310） Send into two-stage dry-type magnetic extractor（311）Ore dressing, ferronickel essence is divided into storehouse accumulating, and directly discharge is transported to Tailings Dam to waste residue.

5. the method that a kind of lateritic nickel ore according to claim 4 prepares ferronickel, it is characterised in that：In pretreatment of raw material, High-temp waste gas send into the water content of the material of mill separator<5%, diameter is less than 1mm.

6. the method that a kind of lateritic nickel ore according to claim 4 prepares ferronickel, it is characterised in that：Make in pelletizing process Pelletizing through roller bearing screening machine distribution device（114）The pelletizing of a diameter of 10-15mm is sent into into pellet storehouse（115）.

7. the enrichment ore-dressing technique of a kind of lateritic nickel ore according to claim 4, its feature is being：Step 4）Mesohigh Roller mill is milled to material below 120 mesh.

8. the enrichment ore-dressing technique of a kind of lateritic nickel ore according to claim 5, its feature is being：The temperature of high-temp waste gas Spend for 400 DEG C -500 DEG C.

9. the enrichment ore-dressing technique of a kind of lateritic nickel ore according to claim 5, its feature is being：Step 3）Middle revolution Kiln（22）Specification：Diameter 4-4.5m, length 80-90m.