CN104561527B - A kind of laterite produces ferronickel method with addition of nickel sulfide concentrate - Google Patents

A kind of laterite produces ferronickel method with addition of nickel sulfide concentrate Download PDF

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Publication number
CN104561527B
CN104561527B CN201510071063.0A CN201510071063A CN104561527B CN 104561527 B CN104561527 B CN 104561527B CN 201510071063 A CN201510071063 A CN 201510071063A CN 104561527 B CN104561527 B CN 104561527B
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nickel sulfide
sulfide concentrate
laterite
nickel
ferronickel
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CN104561527A (en
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刘毅
向花亮
王文
周向东
彭志
谭超明
王东升
郑帮明
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Sichuan Guang Guang Industrial (group) Ltd By Share Ltd
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Sichuan Guang Guang Industrial (group) Ltd By Share Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/02Roasting processes
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B4/00Electrothermal treatment of ores or metallurgical products for obtaining metals or alloys
    • C22B4/06Alloys

Abstract

The invention discloses in a kind of laterite and produce ferronickel method with addition of nickel sulfide concentrate, the method comprises the steps: a, nickel sulfide concentrate is carried out roasting pretreatment;B, pretreated nickel sulfide concentrate, laterite are done ore deposit and reduction coal mixing, after mixing, carry out roasting prereduction;Outlet high temperature calcining temperature 650~750 DEG C;The amount of allocating into of nickel sulfide concentrate makes total ore deposit S content≤0.2%, As content≤0.005% after mixing;C, 650~750 DEG C of high temperature calcinings are sent to mine heat furnace smelting obtain ferro-nickel product;Control slag melting point 1480~1500 DEG C, control SiO in slag250~53%, MgO 27~30%, FeO 8~11%.Present invention achieves nickel sulfide concentrate replaces part laterite to produce ferronickel, and produces direct motion, and ferronickel is up-to-standard, provides a kind of new thinking and method for nickeliferous comprehensive utilization of resources, has certain economic benefit and social benefit.

Description

A kind of laterite produces ferronickel method with addition of nickel sulfide concentrate
Technical field
The invention belongs to ferroalloy production field, be specifically related in a kind of laterite produce ferronickel method with addition of nickel sulfide concentrate.
Background technology
Ferronickel is the important source material producing rustless steel and heat resisting cast steel etc., adds nickel and can improve the corrosion resistance of steel, improve steel in steel Tensile strength, cold deformation and welding performance etc., be widely used in the fields such as machinery, medical treatment, national defence, light industry.At present by The nickel that ferronickel provides has accounted for needed for the whole world more than the 50% of nickel amount, and China has reached more than 75% for 2013, and institute's accounting Regular meeting is increasing.
The nickel resources being available for producing ferronickel in the world has two classes, a class to be nickel sulfide ores;Another kind of is nickel ore, because of its surface Take on a red color, be also laterite.The whole world explored nickel minerals reserves about 23,000,000,000 tons, average nickel content is 0.97%, wherein vulcanizes Nickel minerals reserves are about 10,500,000,000 tons, and average grade is 0.58%, account for the 28% of nickel total resources;Nickel ore is about 12,600,000,000 Ton, average grade is 1.28%, accounts for the 72% of nickel total resources, and it is that ferronickel produces topmost raw material.
Needed for China produces ferronickel, laterite resource mostlys come from Indonesia and Philippine, accounts for China's required nickel money every year More than the 90% of source.In January, 2014 rises, and government of Indonesia implements and forbids raw ore export policy, the ferronickel manufacturing enterprise to China Cause the biggest impact, in order to tackle this ban, it is necessary to seek all disclosure satisfy that ferronickel produce needed for nickel resources in addition Utilize, on the one hand alleviate the buying pressure of laterite, on the other hand make production direct motion, reduce production cost.
The utilization of China's nickel sulfide ore mainly has two kinds of methods: one is to utilize electric furnace, blast furnace, Flash Smelting Furnace to be smelted into low nickel matte, Then the noble metal such as Cu, Co inside wet underwater welding, then by electrolysis production nickel plate;Two is directly to use pressure leaching, leaching Going out liquid electrolysis production nickel plate, the former is to utilize pyrogenic process and wet method to combine to produce nickel plate, and the response rate of nickel is low;The latter is simple employing Wet processing produces nickel plate, and production capacity is relatively low, and energy consumption is high.So far nobody is directly used in pyrometallurgical smelting production ferronickel to nickel sulfide ore, Trace it to its cause mainly in nickel sulfide ore sulfur, arsenic and other impurity contents high, cause sulfur in ferro-nickel product, arsenic content high, Do not reach product quality requirement, and magnesium oxide, dioxide-containing silica are low, slag making difficulty, cause nickel recovery on the low side, produce into This is too high.
Instant invention overcomes numerous difficulties, in laterite, produce ferronickel with addition of partial vulcanization nickel ore concentrate, thereby reduce a ton nickel Ore deposit is consumed, and reduces a ton nickel production cost, enhances the motility of material matching, alleviates laterite buying pressure, is conducive to raw Produce direct motion and reduce production cost.
Summary of the invention
The technical problem to be solved is to provide in a kind of laterite and produces ferronickel method with addition of nickel sulfide concentrate.
The technical solution adopted for the present invention to solve the technical problems is: produce ferronickel side with addition of nickel sulfide concentrate in a kind of laterite Method, comprises the steps:
A, nickel sulfide concentrate is carried out roasting pretreatment, remove the As of the S and more than 30% of more than 90% in nickel sulfide concentrate;
B, the laterite of the nickel sulfide concentrate after roasting pretreatment, aqueous 20~25% is done ore deposit and reduction coal mixing, send after mixing Enter rotary kiln and carry out roasting prereduction;Rotary kiln outlet high temperature calcining temperature 650~750 DEG C;The amount of allocating into the basis of nickel sulfide concentrate Depending on nickel sulfide concentrate and laterite do ore deposit mixed S and As content, make S content≤0.2%, As content≤0.005 after mixing %;
C, 650~750 DEG C of high temperature calcinings are sent to mine heat furnace smelting obtain ferro-nickel product;Control slag melting point 1480~1500 DEG C, Control SiO in slag250~53%, MgO 27~30%, FeO 8~11%.
Wherein, reduction coal described in said method step b is that bituminous coal and anthracite form with the proportioning of required total charcoal amount each 50%.
Wherein, nickel sulfide concentrate is carried out by step a of the present invention roasting pretreatment use recirculating fluidized bed, sintering temperature 1150~ 1250℃.To remove S and As in nickel sulfide concentrate and other impurity elements of part as far as possible.The sulfur dioxide produced in roasting Acid making system can be used to reclaim, thus improve the economic benefit of present invention process.
In step b of the present invention, the amount of allocating into of general nickel sulfide concentrate is the 0.4~5% of total ore deposit amount.
Percentage composition of the present invention is weight/mass percentage composition.
The invention has the beneficial effects as follows: the present invention by carrying out pretreatment, controlling nickel sulfide proportioning, control in advance to nickel sulfide concentrate Reduction temperature, the aggregate measures of control metallurgical slag type so that the present invention can utilize the nickel sulfide concentrate generation higher containing S, As Producing ferronickel for part laterite, and produce direct motion, ferronickel is up-to-standard;Thus decrease a ton nickel minerals consumption, reduce a ton nickel Production cost, alleviates the buying pressure of laterite, enhances the motility of material matching.The present invention is nickeliferous resource comprehensive profit With providing a kind of new thinking and method, produce for domestic ferronickel and open more vast potential for future development.
Detailed description of the invention
Laterite of the present invention produces ferronickel method with addition of nickel sulfide concentrate, comprises the steps:
A, nickel sulfide concentrate is carried out roasting pretreatment, remove the As of the S and more than 30% of more than 90% in nickel sulfide concentrate;
B, the laterite of the nickel sulfide concentrate after roasting pretreatment, aqueous 20~25% is done ore deposit and reduction coal mixing, send after mixing Enter rotary kiln and carry out roasting prereduction;Rotary kiln outlet high temperature calcining temperature 650~750 DEG C;The amount of allocating into the basis of nickel sulfide concentrate Depending on nickel sulfide concentrate and laterite do ore deposit mixed S and As content, make S content≤0.2%, As content≤0.005 after mixing %;
C, 650~750 DEG C of high temperature calcinings are sent to mine heat furnace smelting obtain ferro-nickel product;Control slag melting point 1480~1500 DEG C, Control SiO in slag250~53%, MgO 27~30%, FeO 8~11%.
The particularity that nickel sulfide ore forms due to it, is therefore mainly used in hydrometallurgy, but the above-mentioned comprehensive technological scheme of the present invention is just Achieving nickel sulfide concentrate replaces part laterite pyrogenic process to produce the imagination of ferronickel.Nickel sulfide ore is used for pyrometallurgical smelting for this area From the point of view of technical staff, may be easier to expect, but when the problem of reality is that nickel sulfide is allocated into smelting in laterite Production can be enable to carry out smoothly, the most just can produce qualified ferronickel.First the present invention carries out roasting to nickel sulfide concentrate Pretreatment, it is necessary to remove the As of the S and more than 30% of more than 90% in nickel sulfide concentrate, could be so follow-up prereduction Carry out place mat with smelting, otherwise can not consume these sulfur, arsenic and some other impurity, product matter in prereduction and smelting Amount can not be up to standard.The present invention needs to control the outlet temperature 650 of high temperature calcining~750 DEG C during prereduction, theoretically, Temperature herein should be the highest more good, is more beneficial to the removal of the impurity such as sulfur, but temperature height can make employing raw material of the present invention herein Rotary kiln skinning, the direct motion that impact produces.Step b of the present invention controls mixed sulfur, arsenic content, also basic controlling other The content of some impurity elements, the control of content herein can be produced qualified ferronickel for smelting step and be provided support and place mat. Slag type SiO is controlled when the present invention smelts250~53%, MgO 27~30%, FeO 8~11%, slag type determine slag fusing point, Fusion temperature, viscosity, density, basicity and the quantity of slag etc., slag type is ensureing being smoothed out of smelting operation, metal smelting melt Composition and quality, the aspect such as the response rate of metal and every technical-economic index of smelting has all played conclusive effect, slag type Select the reduction melting of ferronickel is had very important significance.The present invention selects this slag, slag melting point at 1480~1500 DEG C, Meet nickel-iron smelting temperature requirement, enable metal and slag to separate very well, produce direct motion.If MgO is higher, SiO2, FeO inclined Low, cause slag melting point high, tapping temperature is high, and electrode is difficult to lower inserting, and thermal loss is big, and power consumption increases, thus it is suitable to affect production OK, otherwise causing slag melting point on the low side, tapping temperature is low, and slag and metal can not separate very well, and nickel recovery reduces, production cost Increase.
Preferably, reduction coal described in said method step b is that bituminous coal and anthracite form with the proportioning of required total charcoal amount each 50%. The reducing property of bituminous coal is better than anthracite, beneficially the reduction of metal, but its volatile matter is high, and burning-point is low, easily ties kliner coating.Cause This, reducing agent selects bituminous coal and anthracitic compound mode, both ensure that the reduction of the metals such as Ni, Fe, in turn ensure that rotary kiln Do not tie kliner coating thus normally produce.
Below by embodiment, the specific embodiment of the invention is described further.
Embodiment
1, nickel sulfide concentrate is carried out roasting pretreatment, remove the As of the S and more than 30% of more than 90% in nickel sulfide concentrate. Before and after roasting pretreatment, composition is as shown in table 1:
Composition transfer before and after table 1 Roasting of Nickel Suphide Concentrate pretreatment
Composition % Ni TFe MgO CaO SiO2 P S As
Before roasting 10.19 23.85 11.09 1.6 13.77 0.015 15.5 0.2
After roasting 11.84 27.72 12.89 1.86 16.0 0.017 1.55 0.14
2, ore deposit roasting prereduction is joined.It is as shown in table 2 that laterite and nickel sulfide concentrate join ore deposit situation, and the reduction coal amount of allocating into is 69kg/ Ton butt ore deposit, wherein, the bituminous coal amount of allocating into 37kg, the anthracite amount of allocating into 32kg.
Table 2 laterite and nickel sulfide concentrate join ore deposit situation
3, go out rotary kiln calcining temperature 650 DEG C, 650 DEG C of high temperature calcinings are sent to mine heat furnace smelting and obtain ferro-nickel product, product It is shown in Table shown in 3 and table 4 with slag situation:
Table 3 product composition (%)
Ni Cr Si P S As
12.33 1.47 3.50 0.027 0.235 0.049
Table 4 slag type
SiO2 MgO FeO Fusing point DEG C
53.26 27.35 10.92 1485
The embodiment of the present invention produces direct motion, it is possible to obtain qualified ferro-nickel product.
Comparative example
Comparative example is carried out according to the process of above-described embodiment, the most except for the difference that controls rotary kiln calcining temperature 600 DEG C, finally Product composition is as shown in table 5:
Table 5 product composition (%)
Ni Cr Si P S As
12.33 1.47 3.50 0.027 0.403 0.052
As can be seen here, S, As in rotary kiln removal efficiency reduce, cause S and As in product exceed standard (product requirement S < 0.4%, As < 0.05%).As marc type controls the most within the scope of the present invention, making metal and slag to separate very well, nickel recovery reduces, Or electrode is difficult to lower inserting, and thermal loss is big, causes and produces not direct motion.The present invention is only briefly described with above-mentioned comparative example: Comprehensive technological scheme of the present invention can utilize smoothly and replace part laterite to produce ferronickel containing the nickel sulfide concentrate that S, As are higher, Ensure that production direct motion, ferronickel are up-to-standard.

Claims (3)

1. a laterite produces ferronickel method with addition of nickel sulfide concentrate, it is characterised in that comprise the steps:
A, nickel sulfide concentrate is carried out roasting pretreatment, remove the As of the S and more than 30% of more than 90% in nickel sulfide concentrate;
B, the laterite of the nickel sulfide concentrate after roasting pretreatment, aqueous 20~25% is done ore deposit and reduction coal mixing, send after mixing Enter rotary kiln and carry out roasting prereduction;Rotary kiln outlet high temperature calcining temperature 650~750 DEG C;The amount of allocating into the basis of nickel sulfide concentrate Depending on nickel sulfide concentrate and laterite do ore deposit mixed S and As content, make S content≤0.2%, As content≤0.005 after mixing %;
C, 650~750 DEG C of high temperature calcinings are sent to mine heat furnace smelting obtain ferro-nickel product;Control slag melting point 1480~1500 DEG C, Control SiO in slag250~53%, MgO 27~30%, FeO 8~11%.
Laterite the most according to claim 1 produces ferronickel method with addition of nickel sulfide concentrate, it is characterised in that: step b Described in reduction coal be that bituminous coal and anthracite form with the proportioning of required total charcoal amount each 50%.
Laterite the most according to claim 1 produces ferronickel method with addition of nickel sulfide concentrate, it is characterised in that: step a The middle roasting pretreatment that carried out by nickel sulfide concentrate uses recirculating fluidized bed, sintering temperature 1150~1250 DEG C.
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