CN105039683B - Roasting-ammonia leaching processing method for brown iron type laterite nickel ore - Google Patents
Roasting-ammonia leaching processing method for brown iron type laterite nickel ore Download PDFInfo
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Abstract
A roasting-ammonia leaching processing method for brown iron type laterite nickel ore includes the steps that firstly, suspension fluidized roasting is performed on ore powder of the brown iron type laterite nickel ore and reduction gas, nickel oxide and cobalt oxide in the ore powder are fast and dynamically reduced into metal nickel and metal cobalt within 20-120 s, brown iron is reduced into magnetic iron, roasted ore is obtained, and according to the technological condition of roasting, temperature is 600-900 DEG C, and the volume percentage of CO in reducing gas is 2-7%; secondly, magnetic separation is performed on the roasted ore, and magnetite concentrate containing metal nickel and metal cobalt is obtained through separation; and thirdly, ammonia leaching is performed on the magnetite concentrate, and nickel and cobalt leaching agents and magnetic iron leaching slag are obtained. The method achieves the purpose of extracting and purifying nickel and cobalt and comprehensively recovering iron.
Description
Technical field
The invention belongs to lateritic nickel ore refines nickel cobalt field, and in particular to a kind of roasting of brown iron type nickel laterite ore-ammonia leaching
The method for refining nickel cobalt and comprehensive recovery of iron.
Background technology
Lateritic nickel ore is long-term by the ultramafic rock Jing of iron content magnesium silicate mineral (such as olivine, pyroxene, hornblend)
What catamorphism was formed.During long-term weathering, by lifting and corrosion function, weathering composition of layer changes, formed with
Lower two types：One kind is brown iron type nickel laterite ore, and with iron is high, nickel is low, silicon, magnesium are relatively low, but cobalt content it is higher the features such as；
Another kind is garnierite type lateritic nickel ore, and silicon, content of magnesium are higher in its mineral, and iron content is relatively low, and cobalt content is relatively low, but nickel
Content is higher, and the former total resources is about the latter's twice.With continuous increasing of the China to nickel, cobalt and high-quality iron ore concentrate demand
Plus, how nickel, cobalt and comprehensive recovery of iron are refined from brown iron type nickel laterite ore significant.
Reduction roasting-ammonia leaching technique processes brown iron type nickel laterite ore and has realized industry also known as Caron methods using the method
Change.But, reduction roasting generally uses rotary kiln or multi-stage oven roasting, and the recovery time is long, surface " burning " inside easily occurs and " burns
It is impermeable ", the iron of mineral surface is crossed and is reduced into FeO or iron, and interior nickel, cobalt are not reduced or only partial reduction, cross reduction ferrous iron and
By ammonia leaching solution dissolution during ammonia leaching, iron ammonia complexing ion is easily aoxidized and hydrolyzed metallic iron after dissolution, with the hydrogen of gel state
Iron oxide is precipitated out, and absorption nickel, cobalt ammonia complex, wherein cobalt is more easy to be adsorbed, and reduces the leaching rate of nickel and cobalt；While because
Part iron is crossed reduction or is not reduced, and is unfavorable for the magnetic separation recovery iron from leached mud.And, do not have in its process route before ammonia leaching
Carry out throwing useless process, cause back segment to leach needs to process substantial amounts of gangue in operation, and equipment output capacity is low, increased investment；Meanwhile,
It is low to rate of recovery during leached mud magnetic separation recovery iron, or take abandon process reclaim iron, cause iron resource to waste；When Raw Ore is
During powder, pelletizing need to be sintered or be made, increased processing step, increased energy consumption.
In view of the deficiency of the refinement nickel cobalt method of above-mentioned brown iron type nickel laterite ore, there is provided a kind of roasting of brown iron type nickel laterite ore
Burning-ammonia soaks processing method, to reach the purpose for refining nickel cobalt and comprehensive recovery of iron.
The content of the invention
For the problem that prior art is present, the purpose of the present invention is to propose to a kind of roasting-ammonia of brown iron type nickel laterite ore
Leaching processing method, refines nickel cobalt and comprehensive recovery of iron.
The technical scheme for realizing the object of the invention is：
A kind of roasting of brown iron type nickel laterite ore-ammonia leaching processing method, including step：
1) reduction roasting：Brown iron type nickel laterite ore breeze carries out suspension fluosolids roasting with reducing gas, in 20～120S
The quick dynamic of the nickel oxide in breeze, cobalt is inside set to be reduced to metallic nickel, cobalt, brown iron is reduced to Armco magnetic iron, obtains roasted ore, roasting
Process conditions are：Temperature is 600～900 DEG C, and CO volumn concentrations are 2～7% in reducing gas；
2) magnetic separation：To step 1) roasted ore that obtains carries out magnetic separation, the isolated magnetite concentrate comprising metallic nickel, cobalt；
3) ammonia leaching：Ammonia leaching is carried out to magnetite concentrate, nickel, cobalt leachate and Armco magnetic iron leached mud is respectively obtained.
The brown iron type nickel laterite ore has that iron is high, nickel is low, and silicon, magnesium are relatively low, but cobalt content it is higher the characteristics of, nickel, cobalt,
With oxide presence, be not required to melting just can make it be reduced to metallic nickel, cobalt and Armco magnetic iron to iron.General iron content accounts for 30%～
50%, nickel content accounts for 0.5%～1.7%, and cobalt content accounts for 0.05%～0.2%.
Wherein, the granularity of the brown iron type nickel laterite ore breeze<100μm.
100 μm of granularity ＜, breeze has larger specific surface area and reducing gas needs to penetrate into ore deposit when breeze reacts completely
The depth of thing is less than 50 μm, reducing gas was penetrated in tens seconds and reduction is realized inside breeze；In roasting process breeze with
The fluidization of reducing gas sustained suspension is contacted, and heat transfer, mass transfer velocity are fast between gas-solid, and reduction is completed within the short time of 20～120s
Roasting, solves the non-burn-through problem of bulk or bulky grain mineral surfaces burning inside..
And, when 100 μm of granularity ＞, to make roasting process be continuously in suspension fluidization, carry and lift mineral desired gas
Flow velocity is fast, the increase of draught fan matching power, is unfavorable for reducing system operation energy consumption, when mineral granularity is more than furnace reduction gas institute energy
When carrying the maximum particle size lifted, the material that collapses is easily caused in stove, affects the continuous and steady operation of reduction roasting system.
According to the disseminated grain size feature of mineral monomer, powder particle size is preferably close to mineral monomer granularity.By by laterite
Nickel minerals natural air drying to moisture content 25-28%, dry again to moisture content 5-8%, then grind prepared breeze.
It will be evident that mineral granularity is less, liberation degree of minerals and specific surface area are bigger, the present invention using breeze reduction roasting and
Leaching presents following features：(1) the heat and mass speed between breeze and reducing gas is fast, makes to be swift in response inside and outside breeze,
It is even, thorough, under corresponding reaction temperature and CO concentration nickel can improve with the degree of metalization of cobalt, and then raising nickel, cobalt
Leaching rate；(2) breeze specific surface area is big, makes reduction reaction speed faster, shortens the recovery time, reduces stop of the material in stove
Time, and control CO concentration be reduced to below ferrous desired concn in magnet, be easy to control reduction process process, it is to avoid iron is by mistake
Reduction；(3) roasting process produces microcrack, increases the permeation pathway of metallic nickel in breeze, cobalt and leachate, is conducive to carrying
The leaching rate of nickelic and cobalt.
The contrast of view 1 after roasting gives block and bulky grain mineral and the effect after breeze roasting of the present invention
Difference, will become apparent from figure：After the completion of roasting, block and bulky grain mineral (figure is left), the NiO (K1) of surface and middle-shallow layer,
Ni(Co)O·Fe2O3(K2), CoO (K3) and brown iron (K4) complete reduction, generate W metal (K6), metal Co (K8) and magnetic
Property iron (K5), but the mineral of core thoroughly do not reduce, and the iron on surface there occurs reduction, become ferrous iron or metallic iron
(K9) crackle (K7) that, roasting is produced also is distributed only over the shallow region of mineral, and three aspects constrain nickel, cobalt leaching effect；
Breeze (figure right) of the present invention less than 100 μm, the roasting in flash magnetization roasting stove, the nickel in the inside and outside portion of breeze, cobalt, iron are complete
Into reduction reaction, W metal (K6), metal Co (K8) and Armco magnetic iron (K5), and the crackle (K7) that roasting is produced all are generated
The core area of through breeze, increased leaching agent leaches path and the contact area with metal nickel cobalt, improves nickel, cobalt leaching
Go out rate.
Preferably, the device of the suspension fluosolids roasting is flash magnetization roasting stove.
Flash magnetization roasting stove is researched and developed (see Fig. 2) by Hu'nan Changtuo High-Tech. Metallurgical Co., Ltd..Flash magnetization roasting stove
For multistage cylindrical-shaped structure, there is the trunnion (12) of upper cone (10), lower cone (11) and bottom.Brown iron type nickel laterite ore breeze with
The mixture (A) of reducing gas is sprayed into certain flow velocity from the trunnion (12) of flash magnetization roasting furnace bottom, in lower cone
(11) certain altitude at place forms the stream (C) that spurts, and breeze is constantly wrapped up in inspiration air-flow, and injection is got on, and forms many by center
Extrorse eddy flow (B), gets rid of to furnace wall in the case where eddy flow drives, and lower cone (11) place is dropped down onto under furnace wall and is blown afloat to form spray
Stream (C) is risen, makes breeze dispersed in the gas flow, and form cyclone suspension fluidization, continuously leave sudden strain of a muscle with air-flow
Fast magnetization roasting furnace.Flash magnetization roasting stove be set to it is multistage, breeze reducing gas blow load it is up during, be repeatedly subject to
Spurt stream and the cyclonic action formed at lower cone, it is better so that reduction roasting is completed in 20～120s, obtain roasting
The gas-solid mixture (D) of ore deposit and air-flow.
Roasted ore to flowing out from flash magnetization roasting stove is separated with the gas-solid mixture of air-flow, respectively obtains roasting
Ore deposit and baking tail gases.
Metallic nickel, cobalt, Armco magnetic iron oxidation by air in prevent high-temperature roasting ore deposit and lose magnetism, affect magnetic separation effect
Really, step 1) roasted ore that obtains carries out anti-oxidation cooling, such as water quenching or indirect heat exchange.
Preferably, the step 2) in, the field intensity of magnetic separation is 2000～5000Gs.
Magnetic separation, the metallic nickel being enriched with roasted ore to greatest extent, cobalt and Armco magnetic iron and reducing affect the ferrous of ammonia leaching and
The impurity such as gangue.Magnetic separation field intensity is in more than 2000Gs so that metal nickel cobalt, Armco magnetic iron can all be selected and enter magnetite concentrate；Magnetic
Strong below the 5000Gs in selected scenes, prevents the ferrous iron of weak magnetic to be selected and enter magnetite concentrate.Simultaneously for there is shadow in roasted ore
The weak magnetic or non magnetic ore (such as ferrous iron, copper, zinc and its oxide) of ammonia leaching effect are rung, by the step, makes these easy
Mine tailing is selected into by the mineral that ammonia is leached, reducing needs the step of separating these mineral in leachate；Throwing tail by magnetic separation can also subtract
Few Ammonia leaching treating capacity (gangue of having skimmed etc.), improves equipment output capacity.
Wherein, the step 3) in, using NH3-(NH4)2CO3Leaching Systems leaching, the Leaching Systems ammoniacal liquor and carbonic acid
Ammonium salt solution is formed with certain volume than configuration.
Preferably, total ammonia density ([NH in leaching process3] and [NH4 +] concentration sum) it is 4～8mol/L, [NH3] and [NH4 +] molar concentration rate be 1:1～1:4, liquid-solid ratio is 2 during leaching:1～5:1mL/g, extraction time is 1～1.5h, and is continued
It is passed through air stirring leaching.
Keep leach when total ammonia density be 4～8mol/L, liquid-solid ratio ＞ 2:1mL/g, makes ammonia content leach more than roasted ore
Maximum ammonia content, meets nickel, cobalt and all leaches as much as possible needed for nickel, cobalt；Liquid-solid ratio ＜ 5:1mL/g, meets the utilization rate of ammonia,
Reduce the internal circulating load of ammonia.
According to block or pelletizing shape roasted ore, leaching needs 2～3h even longer, because of its internal difficult fully reduction, mineral
Still have difficult labour after ore grinding and give birth to roasting crackle, leaching agent is difficult to permeate, even if increase extraction time to be also difficult to reach high leaching rate.And
The present invention shortens extraction time using the breeze of 100 μm of granularity ＜, improves leaching rate.
Further, in the roasting of brown iron type nickel laterite ore of the present invention-ammonia leaching processing method, brown swage laterite nickel
Being preheated into flash magnetization roasting stokehold, the gas that warm is used is baking tail gases to ore deposit breeze, breeze after preheating
Temperature be 400～600 DEG C, the equipment that warm is used be cyclone cylinder, cyclone cylinder be two grades to Pyatyi.
Preheating causes brown iron type nickel laterite ore breeze temperature to be increased to close reduction reaction temperature, makes breeze enter flash magnetic
Change and reacted rapidly after roaster, shorten the reduction roasting time, beneficial to roasting technique effect, make full use of the energy of tail gas, reduce
Energy consumption.
Wherein, the heat needed for sintering temperature is maintained to be provided by the reducing gas in the reducing roasting process.Also Primordial Qi
Body be containing 2%～7%CO of volume fraction, temperature higher than sintering temperature high-temperature gas, for brown iron type nickel laterite ore powder also
Former and offer maintains the heat needed for sintering temperature.
The preparation method of the reducing gas has several.When fuel is coal dust, not exclusively fired using coal dust in hot-blast stove
Burn, the reducing gas of the gas as high temperature containing CO is obtained；When fuel is coal gas, not exclusively fired using coal gas in hot-blast stove
With coal gas compounding after burning or making coal gas burn completely in hot-blast stove, the reducing gas of the gas as high temperature containing CO is obtained；When
When fuel is natural gas, the cracking gas compounding produced with natural gas pyrolysis after making natural gas burn completely in hot-blast stove is obtained
The reducing gas of the gas as high temperature containing CO.
Beneficial effects of the present invention are：
1st, the present invention makes breeze using suspension fluosolids roasting is carried out to brown iron type nickel laterite ore breeze in 20～120s
In nickel oxide, the quick dynamic of cobalt be reduced to metallic nickel, cobalt, brown iron is reduced to Armco magnetic iron, obtains roasted ore, then carry out magnetic separation and
The technical scheme of ammonia leaching, can obtain the nickel of high leaching rate, cobalt leachate and be conducive to reclaiming the Armco magnetic iron leached mud of iron.
Suspension fluosolids roasting is carried out to the brown iron type nickel laterite ore breeze of powdery, breeze is dispersed in high-temperature reducing gas
In, contact between gas-solid abundant, it is easy to which heat and mass, reaction speed is fast, it is 600～900 DEG C in temperature, CO volumes in reducing gas
Percentage composition is under 2～7% process conditions, to make the quick dynamic of the nickel oxide in breeze, cobalt be reduced to gold in 20～120s
Category nickel, cobalt, brown iron is reduced to Armco magnetic iron, obtains roasted ore；Carry out magnetic separation to roasted ore, it is isolated comprising metallic nickel, cobalt
Magnetite concentrate；Ammonia leaching is carried out to magnetite concentrate, metallic nickel, cobalt is made with complex ion form dissolution and is obtained nickel, cobalt leachate, magnetic
Iron obtains the Armco magnetic iron leached mud for reclaiming iron with slag phase precipitation, it is to avoid iron is leached into leachate, affects nickel, cobalt leaching
The problem for going out.Brown iron type nickel laterite ore breeze suspension fluidization reduction roasting, makes nickel oxide, cobalt quickly dynamic in 20～120s
Metallic nickel, cobalt are reduced to, brown iron is reduced to Armco magnetic iron, obtains roasted ore, solve roasted ore surface " burning " inside and " burn not
The insoluble problem of conventional solution thoroughly ", that is, the iron for avoiding mineral surface is crossed and is reduced into FeO or iron, and interior nickel, cobalt are not
Reduction or the phenomenon of partial reduction, further avoid because ferrous and metallic iron is by ammonia leaching solution dissolution, ferrous ion oxygen after dissolution
Change and hydrolyze, settled out with the iron hydroxide of gel state, absorption nickel, cobalt ammonia complex reduce the problem of the leaching rate of nickel and cobalt；Together
When, the present invention is Armco magnetic iron because of the reducing condition of brown iron, is conducive to reclaiming iron in the form of leached mud.In a word, this programme is being carried
Can comprehensive recovery of iron while high nickel cobalt leaching rate.
2nd, magnetic separation is carried out to roasted ore, abandons useless gangue, reduced and leach operation inventory；In addition, work as in raw ore existing
When weak magnetic ferrous iron, copper, zinc oxide, through reduction roasting so that weak magnetic ferrous iron, the nonmagnetic metal being detained in roasted ore
Copper, zinc, enter mine tailing substantially after magnetic separation step, it is to avoid the problem of nickel, cobalt leaching rate is affected because of ferrous appearance, together
When avoid need to increase to leachate because of copper, the leaching of zinc in nickel, cobalt and copper, the separation circuit of zinc.
3rd, due to Ammonia leach have high selectivity, leach metallic nickel, cobalt and do not leach magnetic iron ore, and easily by ammonia leach
The Jing magnetic separation such as ferrous and copper are abandoned so that the follow-up treatment process of leachate simplifies；And ammonia leaching solution is easily recycled, and then
Reduce leaching cost.
4th, using powdery brown iron type nickel laterite ore reduction roasting, because of the removing of the crystallization water and changing for lattice in roasting process
Become so that almost all of breeze carries microcrack, so increase leachate and nickel, the permeation pathway of cobalt, and then increase
Contact area, improves nickel, cobalt leaching rate.On the contrary, the block or bulky grain mineral of " insufficient burnt ", crackle mainly divides after roasting
Cloth is on mineral top layer, even if still there is part mineral not have crackle after ore grinding, is unfavorable for that nickel, cobalt are leached.
Description of the drawings
Fig. 1 is block or bulky grain and the effect comparison schematic diagram after breeze roasting of the present invention.Left figure is block or big
Grain material；Right figure is the breeze of 100 μm of granularity ＜.
Fig. 2 is flash magnetization roasting stove schematic diagram.
In figure, K1：NiO, K2：Ni(Co)O·Fe2O3, K3：CoO, K4：Brown iron, K5：Armco magnetic iron, K6：W metal, K7：Split
Line, K8：Metal Co, K9：Ferrous or metallic iron, 10：Upper cone, 11：Lower cone, 12：Trunnion, A：Brown iron type nickel laterite ore breeze
With the mixture of reducing gas, B：Eddy flow, C：Spurt stream, D：The gas-solid mixture of roasted ore and air-flow.
Specific embodiment
With reference to specific embodiment, the specific embodiment of the present invention is described in further detail.
Following examples are used to illustrate the present invention, but should not be taken to limit the scope of the present invention.
Flash magnetization roasting stove used in embodiment is Hu'nan Changtuo High-Tech. Metallurgical Co., Ltd.'s production, sees Fig. 2.Flash
Magnetization roasting furnace is multistage cylindrical-shaped structure, including the trunnion 12 of upper cone 10, lower cone 11 and bottom.Brown iron type nickel laterite ore
Powder is sprayed into restore gas mixture A from the trunnion 12 of flash magnetization roasting furnace bottom, and the stream C that spurts is formed in lower cone 11,
And breeze is constantly wrapped up in suck in, injection is got on, and forms many by the extrorse eddy flow B in center, is got rid of to stove in the case where eddy flow drives
Wall, drops down onto at lower cone under furnace wall and is blown afloat to form the stream C that spurts, and makes breeze dispersed in the gas flow, and forms rotation
Stream suspension fluidization, continuously leaves flash magnetization roasting stove with air-flow.Flash magnetization roasting stove is set to multistage, ore deposit
Powder reducing gas blow load it is up during, at multiple neckings, be repeatedly subject to formation at necking to be spurted and flow and eddy flow
Effect, it is better so that reduction roasting is completed in 20～120s, obtain the gas-solid mixture D of roasted ore and air-flow.
Embodiment 1：
Moisture content is 35% brown iron type nickel laterite ore, Jing natural air drying to 28% after enter dryer so as to moisture drop
As little as 6%, grinding machine is subsequently entered to its grinding and further drying, the powder particle size of discharge is 75 μm of ＜, and breeze moisture content is
1%, now nickel, cobalt, the content of iron are respectively 1.06%, 0.17%, 38.05% in breeze.
Breeze sends into the preheating device of flash magnetization roasting stokehold, discharges in preheating device and from cyclone separator
Baking tail gases carry out multistage heat exchange；Reducing gas temperature into flash magnetization roasting stove is higher than sintering temperature, there is provided maintained
Heat needed for sintering temperature.Breeze Jing after being fully warmed-up is entered in flash magnetization roasting stove
5% reducing gas carries out suspension fluosolids roasting at a temperature of 800 DEG C, makes the nickel in ore, cobalt be reduced to metal, and brown iron is also
Originally it was Armco magnetic iron.Breeze is 60s in flash magnetization roasting residing time in furnace.
After the completion of reaction, roasted ore carries out gas solid separation with air-flow into cyclone separator, obtains roasted ore and roasting tail
Gas, baking tail gases are preheated into preheating device to follow-up breeze, and roasted ore enters the anti-oxidation cooling of cooling device (water quenching).Jing is examined
Survey, nickel, cobalt degree of metalization are respectively 96% and 94% in roasted ore, and ferromagnetic rate is 97%.
Ore pulp is made into after cooling and sends into magnetic separator, magnetic separation field intensity is 3000Gs, and concentrate yield is 70%, eliminate it is ferrous and
The impurity such as gangue, it is possible to reduce 30% leaching inventory；Magnetic concentrate is sent into into leaching device, using NH3-(NH4)2CO3Leaching
Go out system, total ammonia density is 4mol/L, [NH3] and [NH4 +] molar concentration rate be 1:4, liquid-solid ratio is 3 during leaching：1mL/g,
Extraction time is 1h, and air stirring leaching is continually fed into during leaching.Metallic nickel, the cobalt in concentrate is leached, magnetic iron ore is not dissolved in should
Leaching Systems, simultaneously because the micropore that crystallization water removing is produced in roasted ore, increases the nickel in leachate and mineral, cobalt contact surface
Greatly, make nickel, cobalt leaching rate respectively reach 96% and 93%, obtain nickel, cobalt leachate；Leachate Jing subsequent treatments can be respectively obtained
Nickel, cobalt product.Iron grade is that 55.7%, Jing routine low intensity magnetic separations obtain iron ore concentrate in leached mud.
Embodiment 2
Brown iron type nickel laterite ore, method drying similarly to Example 1, ball milling, the content difference of nickel, cobalt, iron in breeze
For 0.98%, 0.11%, 45.34%.
Breeze sends into the preheating device of flash magnetization roasting stokehold, discharges in preheating device and from cyclone separator
Baking tail gases carry out multistage heat exchange；Reducing gas temperature into flash magnetization roasting stove is higher than sintering temperature, there is provided maintained
Heat needed for sintering temperature.Breeze Jing after being fully warmed-up is entered in flash magnetization roasting stove
2% reducing gas carries out suspension fluosolids roasting at a temperature of 600 DEG C, makes the nickel in breeze, cobalt be reduced to metal, and brown iron is also
Originally it was Armco magnetic iron.Breeze is 100s in flash magnetization roasting residing time in furnace.
After the completion of reaction, roasted ore carries out gas solid separation with air-flow into cyclone separator, obtains roasted ore and roasting tail
Gas, baking tail gases are preheated into preheating device to follow-up breeze, and roasted ore enters the anti-oxidation cooling of cooling device, and (indirect thermal is handed over
Change, the device as disclosed in using CN203349681U patents).After testing, nickel, cobalt degree of metalization are respectively 95% and in roasted ore
93%, ferromagnetic rate is 96%.
Be made into after cooling ore pulp send into magnetic separator, magnetic separation field intensity be 5000Gs, concentrate yield is 75%, eliminate ferrous iron,
The impurity such as gangue, copper, zinc and its oxide, it is possible to reduce 25% leaching inventory.Magnetic concentrate sends into leaching device, adopts
NH3-(NH4)2CO3Leaching Systems, total ammonia density is 8mol/L, [NH3] and [NH4 +] molar concentration rate be 1:1, liquid-solid ratio is
4:1mL/g, extraction time is 1.5h, and is continually fed into air stirring leaching.Metallic nickel, the cobalt in concentrate is leached, Armco magnetic iron is not
The Leaching Systems are dissolved in, nickel, cobalt leaching rate are obtained and is respectively reached 95% and 92%, Iron grade is 61.04% in leached mud, can be straight
Connect and sold as Iron concentrate.
Embodiment 3
Breeze similarly to Example 1, sends into the preheating device of flash magnetization roasting stokehold, in preheating device with from
The baking tail gases that cyclone separator is discharged carry out multistage heat exchange；Reducing gas temperature into flash magnetization roasting stove is higher than roasting
Burn temperature, there is provided maintain the heat needed for sintering temperature.Breeze Jing after being fully warmed-up enter flash magnetization roasting stove in from
Hot-blast stove containing the reducing gas that CO is 7% carries out suspension fluosolids roasting at a temperature of 900 DEG C, make nickel oxide in breeze,
Cobalt is reduced to metallic nickel, cobalt, and brown iron is reduced to Armco magnetic iron.Breeze is 30s in flash magnetization roasting residing time in furnace.
After the completion of reaction, roasted ore carries out gas solid separation with air-flow into cyclone separator, obtains roasted ore and roasting tail
Gas, baking tail gases are preheated into preheating device to follow-up breeze, and roasted ore enters the anti-oxidation cooling of indirect cooling device.Jing is examined
Survey, nickel, cobalt degree of metalization are respectively 96% and 95% in roasted ore, and ferromagnetic rate is 95%.
Ore pulp is made into after cooling and sends into magnetic separator, magnetic separation field intensity is 2000Gs, and concentrate yield is 67%, can reduce 33%
Leach inventory.Magnetic concentrate sends into leaching device, using NH3-(NH4)2CO3Leaching Systems, total ammonia density is 6mol/L,
[NH3] and [NH4 +] molar concentration rate be 1:2, liquid-solid ratio 5:1mL/g.Metallic nickel, the cobalt in concentrate is leached, Armco magnetic iron is insoluble
In the Leaching Systems, obtain nickel, cobalt leaching rate and respectively reach 95% and 93%, Iron grade is 56.69%, Jing routines in leached mud
Low intensity magnetic separation obtains iron ore concentrate.
Comparative example
The brown iron type nickel laterite ore breeze same with embodiment 1, breeze is made after pelletizing, is roasted using conventional rotary kiln
Burn, (reducing gas is with embodiment 1), roasting time is 2 hours.After testing, nickel, cobalt degree of metalization are respectively 85% in roasted ore
With 80%, ferromagnetic rate is 88%.
After roasted ore cooling, ore grinding, NH is used3-(NH4)2CO3Leaching Systems leach metallic nickel, the cobalt in concentrate, roasted ore
The iron and ferrous iron of middle generation is leached and enters leachate, generates iron hydroxide flocculence after the ferrous ions oxidation of leaching and hydrolysis and sinks
Form sediment, the cobalt that Preferential adsorption is leached, while adsorbing the nickel for leaching so that the nickel and cobalt that part is leached reenters slag phase so that nickel,
Cobalt leaching rate is respectively 78% and 60%, and Iron grade is only 41.81% in leached mud.
Although above being tested with general explanation, specific embodiment transitivity and the present invention having been made in detail
Description, but on the basis of the present invention, it can be made some modifications or improvements, this is to those skilled in the art aobvious and easy
See.Therefore, these modifications or improvements without departing from theon the basis of the spirit of the present invention, belong to claimed
Scope.
Claims (7)
1. a kind of roasting of brown iron type nickel laterite ore-ammonia leaching processing method, including step：
1) reduction roasting：Brown iron type nickel laterite ore breeze carries out suspension fluosolids roasting with reducing gas, makes in 20～120s
The quick dynamic of nickel oxide, cobalt in breeze is reduced to metallic nickel, cobalt, and brown iron is reduced to Armco magnetic iron, obtains roasted ore, roasting technique
Condition is：Temperature is 600～900 DEG C, and CO volumn concentrations are 2～7% in the reducing gas；Wherein, the brown swage
The granularity of lateritic nickel ore breeze<100μm；
2) magnetic separation：To step 1) roasted ore that obtains carries out magnetic separation, the isolated magnetite concentrate comprising metallic nickel, cobalt, magnetic separation
Field intensity be 2000～5000Gs；
3) ammonia leaching：Ammonia leaching is carried out to magnetite concentrate, nickel, cobalt leachate and Armco magnetic iron leached mud is respectively obtained, ammonia leaching adopts NH3-
(NH4)2CO3Leaching Systems are leached, wherein total ammonia density is 4～8mol/L, [NH3] and [NH4 +] molar concentration rate be 1:1～
1:4。
2. the roasting of brown iron type nickel laterite ore according to claim 1-ammonia soaks processing method, it is characterised in that hanged
The device of floating fluosolids roasting is flash magnetization roasting stove.
3. the roasting of brown iron type nickel laterite ore according to claim 2-ammonia soaks processing method, it is characterised in that to from sudden strain of a muscle
The roasted ore that fast magnetization roasting furnace flows out is separated with the gas-solid mixture of air-flow, respectively obtains roasted ore and baking tail gases.
4. the roasting of brown iron type nickel laterite ore according to claim 1-ammonia soaks processing method, it is characterised in that to separating
Roasted ore afterwards carries out anti-oxidation cooling.
5. the roasting of brown iron type nickel laterite ore according to claim 1-ammonia soaks processing method, it is characterised in that during leaching
Liquid-solid ratio is 2:1～5:1mL/g, extraction time is 1～1.5h, and is continually fed into air stirring leaching.
6. the roasting of brown iron type nickel laterite ore according to claim 1-ammonia soaks processing method, it is characterised in that brown swage
Lateritic nickel ore breeze is being preheated into flash magnetization roasting stokehold, and the gas that warm is used is baking tail gases, is preheated
Afterwards the temperature of breeze is 400～600 DEG C, and the equipment that warm is used is cyclone cylinder, and cyclone cylinder is two grades to Pyatyi.
7. the roasting of brown iron type nickel laterite ore according to claim 1-ammonia soaks processing method, it is characterised in that described to go back
The heat needed for sintering temperature is maintained to be provided by the reducing gas in former roasting process.
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| CN106086469B (en) * | 2016-08-09 | 2018-08-28 | 江苏省冶金设计院有限公司 | A kind of method and system for extracting nickel oxide using lateritic nickel ore |
| CN106086467B (en) * | 2016-08-09 | 2018-08-28 | 江苏省冶金设计院有限公司 | A kind of method and system for extracting nickel oxide using lateritic nickel ore |
| CN106119573B (en) * | 2016-08-09 | 2018-08-28 | 江苏省冶金设计院有限公司 | A kind of method and system for extracting nickel oxide using lateritic nickel ore |
| CN114540613A (en) * | 2020-11-27 | 2022-05-27 | 北京博萃循环科技有限公司 | Method for separating nickel and cobalt from laterite-nickel ore |
| CN117165778B (en) * | 2023-05-05 | 2024-05-03 | 西部矿业股份有限公司 | Method for recycling iron and copper through high-iron copper ore modified magnetic separation-acid leaching |
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