CN104451136A - Method for separating metal iron from nickel slag - Google Patents
Method for separating metal iron from nickel slag Download PDFInfo
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- CN104451136A CN104451136A CN201410680518.4A CN201410680518A CN104451136A CN 104451136 A CN104451136 A CN 104451136A CN 201410680518 A CN201410680518 A CN 201410680518A CN 104451136 A CN104451136 A CN 104451136A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
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Abstract
The invention discloses a method for separating metal iron from nickel slag. The method comprises the following steps: (1) performing crushing treatment on the nickel slag to obtain nickel slag particles; (2) performing calcination treatment on the nickel slag particles to convert ferrosilicate in the nickel slag particles into iron oxide and simultaneously generate sulfur-containing gas; (3) performing mixing treatment on the calcined nickel slag particles, a carbon-containing material and an additive to obtain a mixed material; (4) performing forming treatment on the mixed material to obtain a pelletized material; (5) performing drying treatment on the pelletized material to obtain a dried pelletized material; (6) performing reduction treatment on the dried pelletized material to obtain metal pellets; (7) performing melt separation treatment on the metal pellets and carbide slag to obtain metal iron and furnace slag. According to the method, metal iron with lower sulfur content can be effectively separated from the nickel slag, and moreover, the method is low in cost and high in separation efficiency.
Description
Technical field
The invention belongs to Metal smelting technical field, specifically, the present invention relates to a kind of method of separating metal iron from nickel slag.
Background technology
Nickel slag is the waste produced in the thick nickel process of pyrometallurgical smelting, and wherein the grade of iron reaches 40% more than, and from Iron grade, nickel slag is even better than China's part iron ore resource.Because current nickel slag for comprehensive utilizes level not high, only adopt and simply pile up process, along with increasing year by year of nickel slag output, occupy a large amount of soils, return environment simultaneously and bring pollution, be unfavorable for the Sustainable development of coloured industry.
In conjunction with the feature of China's iron ore " rich ore is few, and lean ore is many ", therefore nickel slag can be used as iron-smelting raw material, substitute a part of iron ore.Main ferrous mineral in nickel slag is pyroxene (FeOSiO
2) and peridotites (2FeOSiO
2), be difficult to be reduced, therefore in the reduction process of routine, consume carbonaceous material and increase, and the recovery time increases.In addition, the sulphur also containing 1.0 ~ 1.5% in nickel slag, after reduction and high temperature melting divide, major part enters into molten iron, make the sulphur content of molten iron up to 1.5 ~ 2.5%, far above the requirement to conversion pig, unfavorable to follow-up steelmaking process, if increase desulfurization process, then improve production cost.
The patent that application number is 2012100500302.0 provides a kind of and utilizes nickel slag to carry iron and prepare the method for fiber, specifically discloses in the nickel slag discharged in nickel fibers process and adds reductive agent and auxiliary material, is iron by the Reduction of Oxide of iron in nickel slag; After separating ferrum, kaolinite is added in remaining melting nickel slag, under pressurization 0.5 ~ 1.5MPa, by spinning jet, mixed melting liquid is emitted into silk, by the silk cooling obtained, obtained inorganic fibre, maybe the melt liquid obtained is flowed into tumbling machine, inorganic fibre is formed under the effect of wire swaying roller centrifugal force, though the method make use of the sensible heat of hot nickel slag, and waste residue is prepared into inorganic fibre after carrying iron, but the iron process of carrying of nickel slag is not described in detail, does not more relate to the problem proposing the desulfurization of iron process.
Application number be 201310607371.1 patent propose a kind of nickel slag for comprehensive utilize method, specifically disclose and nickel slag and carbon dust are fully mixed and made into nickel dregs mixing material by weight the ratio for 100:28 ~ 51, nickel dregs mixing material is placed in the inherent vacuum of nickel slag high temperature furnace, 1500 ~ 1800 DEG C, carry out pyroprocessing under the condition of 30 ~ 180 minutes, make the magnesium oxide in nickel slag, ferric oxide, silicon oxide, the main components such as calcium oxide and carbon dust reaction generate MAGNESIUM METAL respectively, metallic iron, silicon carbide, the materials such as calcium carbide, this technology consumes the carbon dust of more (ratio is up to 51%) in pyroprocessing, and the recovery time also longer (being up to 180 minutes), in addition, also needs to carry out under vacuum, temperatures as high 1500 ~ 1800 DEG C, reductive condition is comparatively harsh, not easily realizes, and fully utilizes in process and also do not relate to desulphurization problem, in addition, the most obtained MAGNESIUM METAL is reacted by nickel slag and carbon dust, metallic iron, silicon carbide, the materials such as calcium carbide are also unpractical.
Application number be 200810013552.0 patent propose a kind of method and device of fusing and reducing iron, melting and reduction two processes that the method discloses complete in same seat electric furnace, hot nickel slag and a small amount of cold conditions nickel slag are inserted in electric furnace, progressively feed in raw material, 1500 ~ 1550 DEG C are heated in electric furnace, be melted to molten state, form certain molten bath, iron in nickel slag is reduced spraying into coal dust gradually, add lime simultaneously and carry out slag making with other auxiliary materials, realize the process that in nickel slag, iron is reduced, though the method make use of the sensible heat during discharge of hot nickel slag, but reductive agent needed for reduction process is not add through batch mixing in advance, but spray into into after waiting the fusing of nickel slag, at high temperature coal dust is very easily oxidized generation gas, the waste of reductive agent can be caused, simultaneously, the nickel slag of reduction is liquid homogeneous phase, little with the reductive agent contact area sprayed into, be unfavorable for reduction, and in reduction process, produce a large amount of gas, the waste residue on top layer can be made to bubble, form foamy slag, hinder carrying out further of reduction, in addition, the method does not relate to yet carries iron process desulphurization problem.
Therefore, the technology of existing separating metal iron from nickel slag is further improved.
Summary of the invention
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, one object of the present invention is a kind of method proposing separating metal iron from nickel slag, and the method effectively can isolate the lower metallic iron of sulfur-bearing from nickel slag, and the method is with low cost, separation efficiency is high.
In one aspect of the invention, the present invention proposes a kind of method of separating metal iron from nickel slag, comprising:
(1) described nickel slag is carried out break process, to obtain nickel solid impurity particle;
(2) described nickel solid impurity particle is carried out calcination process, to make the ferrosilicate contained in described nickel solid impurity particle be converted into ferric oxide, produce sulfurous gas simultaneously;
(3) the nickel solid impurity particle after described calcination process and carbonaceous material and additive are carried out combination treatment, to obtain mixture;
(4) described mixture is carried out forming processes, to obtain pelletizing material;
(5) described pelletizing material is carried out drying treatment, to obtain the pelletizing material through super-dry;
(6) the described pelletizing material through super-dry is carried out reduction treatment, to obtain metallized pellet; And
(7) described metallized pellet and carbide slag are carried out molten divisional processing, to obtain metallic iron and slag.
According to the method for separating metal iron from nickel slag of the embodiment of the present invention by before nickel slag is carried out reduction treatment, nickel slag is carried out calcination process, the ferrosilicate of difficult reduction in nickel slag is made to be converted into the ferric oxide of comparatively easily reduction, and then significantly can reduce the time of sequential reduction process and the consumption of carbonaceous material, thus reduction processing cost, pass through calcination process simultaneously, the element sulphur of part in nickel slag can be removed, thus significantly improve the grade of the metallic iron obtained in subsequent process, in addition, adopt cheap carbide slag as sweetening agent and fusing assistant, effectively can realize the separation of slag iron, thus reduce desulphurization cost.
In addition, the method for separating metal iron from nickel slag according to the above embodiment of the present invention can also have following additional technical characteristic:
In some embodiments of the invention, in step (1), the mean particle size of described nickel solid impurity particle is 0.5 ~ 2 millimeter.Thus, calcination process efficiency can be significantly improved.
In step (2), described calcination process carries out 20 ~ 40 minutes under the air of 700 ~ 1000 degrees Celsius or oxygen enrichment percentage are the air atmosphere of 5 ~ 30v%.Thus, calcination process efficiency can be improved further.
In some embodiments of the invention, in step (3), in described carbonaceous material, fixed carbon content is not less than 60wt%.Thus, sequential reduction processing efficiency can be significantly improved.
In some embodiments of the invention, described additive comprises fusing assistant and binding agent, and wherein, described fusing assistant is carbide slag, and described binding agent is be selected from least one in wilkinite, molasses, starch, water glass and pitch.Thus, sequential reduction processing efficiency can be improved further.
In some embodiments of the invention, in step (3), be that described combination treatment is carried out in 100:12 ~ 25:6 ~ 15 by the nickel solid impurity particle after described calcination process, described carbonaceous material and described additive according to mass ratio.Thus, sequential reduction processing efficiency can be improved further.
In some embodiments of the invention, in step (6), described reduction treatment carries out 10 ~ 20 minutes under 1250 ~ 1400 degrees Celsius.Thus, reduction treatment efficiency can be improved further.
In some embodiments of the invention, in step (7), the mass ratio of described metallized pellet and described carbide slag is 100:3 ~ 12.Thus, desulfuration efficiency can be significantly improved.
In some embodiments of the invention, described molten divisional processing carries out 30 ~ 90 minutes under 1450 ~ 1550 degrees Celsius.Thus, molten divisional processing efficiency can be significantly improved.
Accompanying drawing explanation
Fig. 1 is the method flow schematic diagram of separating metal iron from nickel slag according to an embodiment of the invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
In one aspect of the invention, the present invention proposes a kind of method of separating metal iron from nickel slag.Below with reference to Fig. 1, the method for separating metal iron from nickel slag of the embodiment of the present invention is described in detail.According to embodiments of the invention, the method comprises:
S100: break process
According to embodiments of the invention, nickel slag is carried out break process, thus nickel solid impurity particle can be obtained.According to embodiments of the invention, nickel slag can from the waste produced in the thick nickel process of pyrometallurgical smelting.According to embodiments of the invention, the mode of break process carried out to nickel slag and is not particularly limited, according to a particular embodiment of the invention, oppositely rolling roller crusher can be adopted to carry out break process to nickel slag.According to embodiments of the invention, the particle diameter of nickel solid impurity particle is also not particularly limited, and according to a particular embodiment of the invention, the mean particle size of nickel solid impurity particle can be 0.5 ~ 2 millimeter.Contriver finds, if nickel solid impurity particle granularity is greater than 2 millimeters, ferrosilicate rate of oxidation is comparatively slow, and oxidization time is grown and weak effect; And undersized, the oxygen-enriched stream be easily passed in follow-up roasting process blows away, and causes damage.
S200: calcination process
According to embodiments of the invention, nickel solid impurity particle obtained above is carried out calcination process, to make the ferrosilicate contained in nickel solid impurity particle be converted into ferric oxide, produce sulfurous gas simultaneously.Contriver finds, before nickel slag is carried out reduction treatment, calcination process is carried out to nickel slag, the ferrosilicate (pyroxene and peridotites) of thinner for granularity in nickel slag, difficult reduction can be converted into the ferric oxide of comparatively easily reduction, and the further enrichment of particle is grown up, and then significantly reduce the time of sequential reduction process and the consumption of carbonaceous material, thus significantly reduce processing cost, make the element sulphur contained in nickel slag separate in gaseous form simultaneously, thus significantly improve the grade of the metallic iron obtained in subsequent process.According to embodiments of the invention, the condition of calcination process is also not particularly limited, and according to a particular embodiment of the invention, calcination process can carry out 20 ~ 40 minutes under the air of 700 ~ 1000 degrees Celsius or oxygen enrichment percentage are the air atmosphere of 5 ~ 30v%.Contriver finds, the calcination process of carrying out under this atmosphere, can significantly improve roasting quality, improves the transformation efficiency that ferrosilicate (pyroxene and peridotites) is converted into ferric oxide simultaneously.
S300: the nickel solid impurity particle after calcination process mixes with carbonaceous material and additive
According to embodiments of the invention, the nickel solid impurity particle after calcination process obtained above is mixed with carbonaceous material and additive, thus can mixture be obtained.According to embodiments of the invention, the particular type of carbonaceous material is also not particularly limited, according to a particular embodiment of the invention, can be not less than the carbonaceous material of 60wt% for fixed carbon content, such as carbonaceous material can for being selected from least one in blue charcoal, brown coal, smokeless Coal and coke.According to embodiments of the invention, the concrete composition of additive is also not particularly limited, and according to a particular embodiment of the invention, additive can comprise fusing assistant and binding agent.According to embodiments of the invention, the particular type of fusing assistant and binding agent is also not particularly limited, according to a particular embodiment of the invention, fusing assistant can be carbide slag, and binding agent can for being selected from least one in wilkinite, molasses, starch, water glass and pitch.According to embodiments of the invention, nickel solid impurity particle after calcination process and carbonaceous material and additive carried out the ratio that mixes and be not particularly limited, according to a particular embodiment of the invention, can be that combination treatment is carried out in 100:12 ~ 25:6 ~ 15 according to mass ratio by nickel solid impurity particle, carbonaceous material and the additive after calcination process, and need to ensure that each compound granularity accounts for more than 80% below 75 microns before combination.Thus, the contact area of nickel solid impurity particle and carbonaceous material in reduction process can significantly be increased.
S400: forming processes
According to embodiments of the invention, mixture obtained above is carried out forming processes, thus pelletizing material can be obtained.According to embodiments of the invention, the particle diameter of pelletizing material is also not particularly limited, and according to a particular embodiment of the invention, the particle diameter of pelletizing material can be 8 ~ 14mm.According to embodiments of the invention, the method for forming processes is also not particularly limited, and according to a particular embodiment of the invention, the mode of extrusion forming can be adopted to carry out forming processes.In this step, by carrying out forming processes to the mixture of the nickel solid impurity particle after calcination process and carbonaceous material and additive, significantly can increase the point of contact of nickel solid impurity particle in sequential reduction process after calcination process and carbonaceous material, be easy to abundant reduction simultaneously.Thus, significantly can reduce reduction temperature and the recovery time of nickel slag, thus reduce production energy consumption and cost.
S500: drying treatment
According to embodiments of the invention, the above-mentioned pelletizing material that obtains is carried out drying treatment, thus the pelletizing material through super-dry can be obtained.According to embodiments of the invention, the condition of drying treatment is also not particularly limited, and according to a particular embodiment of the invention, drying treatment can be carried out under temperature is 120 degrees Celsius and pressure is 0.1MPa condition.Contriver finds, can significantly improve pelletizing dry materials efficiency under this condition.
S600: reduction treatment
According to embodiments of the invention, the pelletizing material through drying treatment obtained above is carried out reduction treatment, thus can metallized pellet be obtained.According to embodiments of the invention, the condition of reduction treatment is also not particularly limited, and according to a particular embodiment of the invention, reduction treatment can carry out 10 ~ 20 minutes under 1250 ~ 1400 degrees Celsius.In this step, concrete, the iron oxide reduction in pelletizing material can be metallic iron simple substance by the carbon in carbonaceous material, thus can realize the separation of subsequent metal iron.
S700: molten divisional processing
According to embodiments of the invention, the metallized pellet obtained above and carbide slag are carried out molten divisional processing, thus can be separated and obtain metallic iron and slag.According to embodiments of the invention, melt the condition of divisional processing and be not particularly limited, according to a particular embodiment of the invention, molten divisional processing can carry out 30 ~ 90 minutes under 1450 ~ 1550 degrees Celsius.According to embodiments of the invention, metallized pellet and carbide slag blending ratio are also not particularly limited, and according to a particular embodiment of the invention, the mass ratio of metallized pellet and carbide slag can be 100:3 ~ 12.According to embodiments of the invention, before carrying out molten divisional processing, metallized pellet and carbide slag can be carried out alternately cloth, thus the adjacent metallized pellet layer of multilayer and calcium carbide slag blanket can be formed.In this step, first carbide slag is carried out drying, then metallized pellet hot charging reduction treatment obtained is sent in molten point stove, in order to promote sweetening effectiveness, carbide slag is powder and distributing mode can adopt: during cloth cloth one deck hot charging metallized pellet after, and then cloth one deck carbide slag, after this repeats this step and terminates to cloth, then in 1450 ~ 1550 degrees Celsius, high temperature melting divides 30 ~ 90 minutes, and the metallic iron in metallized pellet is separated with molten iron form.Contriver finds, due to SiO in nickel slag
2and Al
2o
3content is higher, make molten timesharing slag be acid slag, and in acid slag, melt polymerization degree is higher, causes poor fluidity; The main component of carbide slag is Ca (OH)
2and a small amount of CaO and CaC
2, Ca (OH)
2in molten point heat-processed, (effusion of aqueous vapor can also play certain stirring action in dehydration, bath composition can be made to be tending towards even) generate alkaline CaO, polynary slag system is formed with other gangue contents, alkalescence CaO can destroy the polymerization degree of slag, reduce the fusing point of slag simultaneously, improve the mobility of molten point slag; CaO and CaC simultaneously
2can with the reaction of Salmon-Saxl in molten iron generate CaS enter slag mutually in so that play desulfidation, the mobility of slag improves, and is conducive to the carrying out of desulfurization, in addition, adopt cheap carbide slag as sweetening agent and fusing assistant, effectively can realize the separation of slag iron, thus significantly can reduce desulphurization cost.
According to the method for separating metal iron from nickel slag of the embodiment of the present invention by before nickel slag is carried out reduction treatment, nickel slag is carried out calcination process, the ferrosilicate of difficult reduction in nickel slag is made to be converted into the ferric oxide of comparatively easily reduction, and then significantly can reduce the time of sequential reduction process and the consumption of carbonaceous material, thus reduction processing cost, pass through calcination process simultaneously, the element sulphur of part in nickel slag can be removed, thus significantly improve the grade of the metallic iron obtained in subsequent process, in addition, adopt cheap carbide slag as sweetening agent and fusing assistant, effectively can realize the separation of slag iron, thus reduce desulphurization cost.
Below with reference to specific embodiment, present invention is described, it should be noted that, these embodiments are only descriptive, and do not limit the present invention in any way.
Embodiment 1
Nickel slag forms: TFe content is 38.12wt%, FeO content be 43.50wt%, Ni content be 0.42wt%, S content is 1.06wt%;
Separating step: dried nickel slag is carried out break process, obtain the nickel solid impurity particle that mean particle size is 0.5 ~ 2 millimeter, then nickel solid impurity particle is distributed in stoving oven, and pass into air roasting 30min 800 DEG C time that oxygen enrichment percentage is 10v%, after roasting, in nickel slag, the decreasing ratio of sulphur is 6.4wt%, then by the nickel solid impurity particle after roasting and carbonaceous material, additive carries out mix according to the mass ratio of 100:18:13, then carry out forming processes and obtain pelletizing material, then dried pelletizing material is distributed in rotary hearth furnace, the hot charging after 15min that reduces at 1300 DEG C is sent into high temperature melting and is divided stove, hot charging metallized pellet and carbide slag are according to the mass ratio successively cloth of mass ratio 100:5, i.e. cloth layer of metal pellet then cloth one deck carbide slag, and a point 50min is melted at 1500 DEG C, content >=the 95wt% of Fe in the molten iron obtained, the content of Ni is 1.12wt%, the content of S is 0.034wt%.
Embodiment 2
Nickel slag forms: with embodiment 1;
Separating step: dried nickel slag is carried out break process, obtain the nickel solid impurity particle that mean particle size is 0.5 ~ 2 millimeter, then nickel solid impurity particle is distributed in stoving oven, and pass into air roasting 20min 800 DEG C time that oxygen enrichment percentage is 15v%, after roasting, in nickel slag, the decreasing ratio of sulphur is 6.1wt%, then by the nickel solid impurity particle after roasting and carbonaceous material, additive carries out mix according to the mass ratio of 100:18:13, then carry out forming processes and obtain pelletizing material, then dried pelletizing material is distributed in rotary hearth furnace, the hot charging after 15min that reduces at 1300 DEG C is sent into high temperature melting and is divided stove, hot charging metallized pellet and carbide slag are according to the mass ratio successively cloth of mass ratio 100:5, i.e. cloth layer of metal pellet then cloth one deck carbide slag, and a point 50min is melted at 1500 DEG C, content >=the 95wt% of Fe in the molten iron obtained, the content of Ni is 1.06wt%, the content of S is 0.037wt%.
Embodiment 3
Nickel slag forms: with embodiment 1;
Separating step: dried nickel slag is carried out break process, obtain the nickel solid impurity particle that mean particle size is 0.5 ~ 2 millimeter, then nickel solid impurity particle is distributed in stoving oven, and pass into air roasting 30min 1000 DEG C time that oxygen enrichment percentage is 10v%, after roasting, in nickel slag, the decreasing ratio of sulphur is 8.5wt%, then by the nickel solid impurity particle after roasting and carbonaceous material, additive carries out mix according to the mass ratio of 100:18:13, then carry out forming processes and obtain pelletizing material, then dried pelletizing material is distributed in rotary hearth furnace, the hot charging after 15min that reduces at 1300 DEG C is sent into high temperature melting and is divided stove, hot charging metallized pellet and carbide slag are according to the mass ratio successively cloth of mass ratio 100:8, i.e. cloth layer of metal pellet then cloth one deck carbide slag, and a point 50min is melted at 1500 DEG C, content >=the 95wt% of Fe in the molten iron obtained, the content of Ni is 1.15wt%, the content of S is 0.030wt%.
Embodiment 4
Nickel slag forms: with embodiment 1;
Separating step: dried nickel slag is carried out break process, obtain the nickel solid impurity particle that mean particle size is 0.5 ~ 2 millimeter, then nickel solid impurity particle is distributed in stoving oven, and pass into pure air roasting 20min 1000 DEG C time, after roasting, in nickel slag, the decreasing ratio of sulphur is 6.5wt%, then by the nickel solid impurity particle after roasting and carbonaceous material, additive carries out mix according to the mass ratio of 100:18:13, then carry out forming processes and obtain pelletizing material, then dried pelletizing material is distributed in rotary hearth furnace, the hot charging after 15min that reduces at 1300 DEG C is sent into high temperature melting and is divided stove, hot charging metallized pellet and carbide slag are according to the mass ratio successively cloth of mass ratio 100:3, i.e. cloth layer of metal pellet then cloth one deck carbide slag, and a point 50min is melted at 1500 DEG C, content >=the 95wt% of Fe in the molten iron obtained, the content of Ni is 0.98wt%, the content of S is 0.044wt%.
Embodiment 5
Nickel slag forms: with embodiment 1;
Separating step: dried nickel slag is carried out break process, obtain the nickel solid impurity particle that mean particle size is 0.5 ~ 2 millimeter, then nickel solid impurity particle is distributed in stoving oven, and pass into air roasting 40min 700 DEG C time that oxygen enrichment percentage is 30v%, after roasting, in nickel slag, the decreasing ratio of sulphur is 7.2wt%, then by the nickel solid impurity particle after roasting and carbonaceous material, additive carries out mix according to the mass ratio of 100:18:13, then carry out forming processes and obtain pelletizing material, then dried pelletizing material is distributed in rotary hearth furnace, the hot charging after 15min that reduces at 1300 DEG C is sent into high temperature melting and is divided stove, hot charging metallized pellet and carbide slag are according to the mass ratio successively cloth of mass ratio 100:5, i.e. cloth layer of metal pellet then cloth one deck carbide slag, and a point 50min is melted at 1500 DEG C, content >=the 95wt% of Fe in the molten iron obtained, the content of Ni is 1.24wt%, the content of S is 0.021wt%.
Embodiment 6
Nickel slag forms: with embodiment 1;
Separating step: dried nickel slag is carried out break process, obtain the nickel solid impurity particle that mean particle size is 0.5 ~ 2 millimeter, then nickel solid impurity particle is distributed in stoving oven, and pass into air roasting 25min 900 DEG C time that oxygen enrichment percentage is 20v%, after roasting, in nickel slag, the decreasing ratio of sulphur is 7.5wt%, then by the nickel solid impurity particle after roasting and carbonaceous material, additive carries out mix according to the mass ratio of 100:18:13, then carry out forming processes and obtain pelletizing material, then dried pelletizing material is distributed in rotary hearth furnace, the hot charging after 15min that reduces at 1300 DEG C is sent into high temperature melting and is divided stove, hot charging metallized pellet and carbide slag are according to the mass ratio successively cloth of mass ratio 100:9, i.e. cloth layer of metal pellet then cloth one deck carbide slag, and a point 50min is melted at 1500 DEG C, content >=the 95wt% of Fe in the molten iron obtained, the content of Ni is 1.09wt%, the content of S is 0.026wt%.
In the description of this specification sheets, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification sheets or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (9)
1. the method for separating metal iron from nickel slag, is characterized in that, comprising:
(1) described nickel slag is carried out break process, to obtain nickel solid impurity particle;
(2) described nickel solid impurity particle is carried out calcination process, to make the ferrosilicate contained in described nickel solid impurity particle be converted into ferric oxide, produce sulfurous gas simultaneously;
(3) the nickel solid impurity particle after described calcination process and carbonaceous material and additive are carried out combination treatment, to obtain mixture;
(4) described mixture is carried out forming processes, to obtain pelletizing material;
(5) described pelletizing material is carried out drying treatment, to obtain the pelletizing material through super-dry;
(6) the described pelletizing material through super-dry is carried out reduction treatment, to obtain metallized pellet; And
(7) described metallized pellet and carbide slag are carried out molten divisional processing, to obtain metallic iron and slag.
2. the method for separating metal iron from nickel slag according to claim 1, is characterized in that, in step (1), the mean particle size of described nickel solid impurity particle is 0.5 ~ 2 millimeter.
3. the method for separating metal iron from nickel slag according to claim 1, it is characterized in that, in step (2), described calcination process carries out 20 ~ 40 minutes under the air of 700 ~ 1000 degrees Celsius or oxygen enrichment percentage are the air atmosphere of 5 ~ 30v%.
4. the method for separating metal iron from nickel slag according to claim 1, is characterized in that, in step (3), in described carbonaceous material, fixed carbon content is not less than 60wt%.
5. the method for separating metal iron from nickel slag according to claim 1, it is characterized in that, described additive comprises fusing assistant and binding agent, wherein, described fusing assistant is carbide slag, and described binding agent is be selected from least one in wilkinite, molasses, starch, water glass and pitch.
6. the method for separating metal iron from nickel slag according to claim 1, it is characterized in that, in step (3), be that described combination treatment is carried out in 100:12 ~ 25:6 ~ 15 by the nickel solid impurity particle after described calcination process, described carbonaceous material and described additive according to mass ratio.
7. the method for separating metal iron from nickel slag according to claim 1, is characterized in that, in step (6), described reduction treatment carries out 10 ~ 20 minutes under 1250 ~ 1400 degrees Celsius.
8. the method for separating metal iron from nickel slag according to claim 1, is characterized in that, in step (7), the mass ratio of described metallized pellet and described carbide slag is 100:3 ~ 12.
9. the method for separating metal iron from nickel slag according to claim 1, is characterized in that, described molten divisional processing carries out 30 ~ 90 minutes under 1450 ~ 1550 degrees Celsius.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN105838840A (en) * | 2016-05-24 | 2016-08-10 | 江苏省冶金设计院有限公司 | Method for preparing granular iron and system for preparing granular iron |
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| CN112029992A (en) * | 2020-08-27 | 2020-12-04 | 西安建筑科技大学 | Material for promoting reduction of nickel slag and preparation method thereof |
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