CN218059144U - Device for producing high nickel matte from low nickel matte - Google Patents
Device for producing high nickel matte from low nickel matte Download PDFInfo
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- CN218059144U CN218059144U CN202222307449.5U CN202222307449U CN218059144U CN 218059144 U CN218059144 U CN 218059144U CN 202222307449 U CN202222307449 U CN 202222307449U CN 218059144 U CN218059144 U CN 218059144U
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Abstract
The utility model relates to a technical field is smelted to nickel, discloses a device of low nickel matte production high nickel matte, includes in the device: an oxygen-enriched converting furnace; a slag depletion furnace; a slag chute connecting the oxygen-enriched converting furnace and the slag-depleting furnace; the oxygen-enriched converting furnace and the slag depletion furnace both comprise vertical fixed furnace bodies; the vertical fixed furnace body comprises a gas phase zone furnace body, a furnace top cover, a molten pool reaction zone furnace body formed by adopting a water cooling structure, and a furnace hearth built by refractory materials; the furnace hearth is provided with a slag tap and a siphon, the shell of the furnace hearth consists of a steel frame, a pull rod and a spring part, the spring part is positioned between the steel frame and the pull rod, and the shell of the furnace hearth is of an elastic structure. The utility model provides a device of low nickel matte production high nickel matte has when production that nickel cobalt rate of recovery is high, flue gas composition and flue gas volume are stable, to environment friendly's advantage.
Description
Technical Field
The utility model relates to a technical field is smelted to the nickel, concretely relates to low nickel matte production device of high nickel matte.
Background
The nickel ore mainly comprises nickel sulfide ore and nickel oxide ore.
The smelting process of the nickel mainly comprises a pyrogenic process and a wet process.
The fire process is generally adopted for the nickel sulfide ore, the nickel sulfide ore is oxidized and smelted to produce low nickel matte, and the low nickel matte is further blown to produce high nickel matte.
The nickel oxide ore mainly comprises a wet leaching process and a pyrometallurgy process, and the intermediate products of the pyrometallurgy process are nickel-iron alloy and low grade nickel matte.
The low grade nickel matte intermediate products produced from the sulphide ore and the oxide ore need to be further blown to produce high grade nickel matte.
At present, the blowing of low nickel matte adopts the traditional converter blowing process. The main defects of the converter blowing process comprise: the field operation environment is severe, the operation is interrupted, the fluctuation of the concentration of sulfur dioxide in the flue gas is large, the subsequent acid making process is not facilitated, the hot material to be smelted is blown, the cold material is difficult to be blown separately, the service cycle of a furnace lining of a blowing furnace, particularly a tuyere brick, is short, and the recovery rate of nickel and cobalt is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the aforementioned defect that the low nickel matte converting process exists among the prior art, providing a technology that high nickel matte of low nickel matte production of nickel cobalt rate of recovery is high.
In order to achieve the above object, a first aspect of the present invention provides a method for producing high nickel matte from low nickel matte, the method comprising:
(1) Low nickel matte converting
Continuously introducing the solid low nickel matte and the flux I into an oxygen-enriched converting furnace for converting to produce high nickel matte, converting slag and converting flue gas; the flux I is quartz;
(2) Oxygen-enriched dilution of blowing slag
Spraying a reducing agent, a vulcanizing agent and oxygen-enriched air II into a slag depletion furnace of a slag oxygen-enriched depletion bath reaction zone, and intermittently leading out blown slag from the oxygen-enriched blowing furnace to flow into the slag depletion furnace of the slag oxygen-enriched depletion bath reaction zone through a slag chute to perform a reduction vulcanization reaction to produce high-cobalt low-nickel matte and depleted slag; controlling the oxygen excess coefficient alpha of the oxygen-enriched air II to the reducing agent to be 0.4-0.5; controlling the temperature in the slag dilution furnace to be 1250-1400 ℃.
The second aspect of the utility model provides a device of low nickel matte production high nickel matte, include in the device:
an oxygen-enriched converting furnace;
a slag depletion furnace;
the slag chute is connected with the oxygen-enriched converting furnace and the slag depleting furnace;
the oxygen-enriched converting furnace and the slag dilution furnace both comprise vertical fixed furnace bodies;
the vertical fixed furnace body comprises a gas phase zone furnace body, a furnace top cover, a molten pool reaction zone furnace body formed by adopting a water cooling structure and a furnace hearth built by refractory materials;
the furnace hearth is provided with a slag tap and a siphon channel, a shell of the furnace hearth consists of a steel frame, a pull rod and a spring part, the spring part is positioned between the steel frame and the pull rod, and the shell of the furnace hearth is of an elastic structure.
The utility model provides a process for producing high nickel matte by low nickel matte has the advantages of high nickel-cobalt recovery rate, stable smoke components and smoke gas volume, and environmental friendliness.
Furthermore, the utility model discloses a flue gas that technology that low nickel matte produced high nickel matte obtainedSO in (1) 2 The concentration is high, which is beneficial to acid preparation; further, this system sour technology can break away from the independent operation of system's cold burden of smelting, makes the utility model discloses a furnace body operating cycle of device of high nickel matte of low nickel matte production is long.
Drawings
FIG. 1 is a process flow diagram for producing high nickel matte from low nickel matte according to the present invention;
FIG. 2 is a front view and a side view of an oxygen-enriched converting furnace in the device for producing high nickel matte from low nickel matte;
fig. 3 is a schematic connection diagram of the device for producing high nickel matte by using low nickel matte.
Description of the reference numerals
a. An oxygen-enriched converting furnace; b. a slag chute; c. slag dilution furnace
1. A hearth; 2. a flat water jacket; 3. a layer of water-cooled pieces; 4. a second layer of water-cooling piece; 5. a refractory material masonry; 6. a water-cooling water jacket; 7. a smoke exhaust flue; 8. a flue water jacket; 9. a feed aperture; 10. a furnace roof; 11. a tertiary air port; 12. a secondary tuyere; 13. a slag tap; 14. a primary air port; 15. a nickel matte discharging port; 16. a steel frame; 17. pull rod
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
As previously mentioned, the first aspect of the present invention provides a method for producing high nickel matte from low nickel matte, which comprises:
(1) Low nickel matte converting
Continuously introducing the solid low nickel matte and the flux I into an oxygen-enriched converting furnace for converting to produce high nickel matte, converting slag and converting flue gas; the flux I is quartz;
(2) Oxygen-enriched dilution of blowing slag
Spraying a reducing agent, a vulcanizing agent and oxygen-enriched air II into a slag depletion furnace of a slag oxygen-enriched depletion bath reaction area, and intermittently leading out blown slag from the oxygen-enriched blown furnace to flow into the slag depletion furnace of the slag oxygen-enriched depletion bath reaction area through a slag chute to perform a reduction vulcanization reaction to produce high-cobalt low-nickel matte and depletion slag; controlling the oxygen excess coefficient alpha of the oxygen-enriched air II to the reducing agent to be 0.4-0.5; controlling the temperature in the slag dilution furnace to be 1250-1400 ℃.
In the utility model, the oxygen excess coefficient α of the oxygen-enriched air II to the reducing agent = the actual oxygen molar quantity provided/the theoretical oxygen molar quantity required for the complete reaction of the system.
Preferably, in the step (1), the solid low grade nickel matte contains 20wt% to 25wt% of nickel element, 45wt% to 55wt% of iron element, 0.5wt% to 1.5wt% of cobalt element and 20wt% to 35wt% of sulfur element.
Preferably, in the step (1), the conditions in the oxygen-enriched blowing furnace and the weight ratio of the solid low grade nickel matte to the flux I are controlled, so that the mass ratio of the iron element to the silicon dioxide in the blowing slag is 1.5-2.5:1.
according to a preferred embodiment, in step (1), the method further comprises: and spraying oxygen-enriched air I into the oxygen-enriched converting furnace.
Preferably, in the step (1), the volume concentration of oxygen in the oxygen-enriched air I is 40-70%, and the pressure of the injected oxygen-enriched air I is 0.08-0.2 MPa.
Preferably, in step (1), the method further comprises: and spraying pulverized coal into a primary tuyere in the oxygen-enriched converting furnace, wherein the spraying amount of the pulverized coal is 1 to 3 weight percent of the amount of the material entering the furnace, and the amount of the material entering the furnace is the sum of the amounts of the solid low grade nickel matte and the flux I.
The utility model has no special requirements on the granularity and the source of the pulverized coal, and the technical personnel in the field can adopt the pulverized coal known in the field to carry out the scheme of the utility model.
Preferably, in the step (1), the converting temperature in the oxygen-rich converting furnace is 1250 to 1350 ℃.
Preferably, in step (1), the method further comprises: the converting flue gas is introduced into a flue gas acid making system for post-treatment after sequentially passing through a waste heat boiler to recover waste heat and an electric dust remover to remove dust.
Preferably, in the step (2), the method further comprises: a flux II is introduced into a slag-depleted furnace in the slag-oxygen-enriched depleted bath reaction zone.
Preferably, the flux II is calcium oxide and/or calcium carbonate.
Preferably, the amount of flux II introduced is such that the slag in the slag-depleted furnace is CaO/SiO 2 In a weight ratio of 0.3-0.6:1.
preferably, in the step (2), the reducing agent is selected from at least one of coke powder, bituminous coal and anthracite coal; the amount of the reducing agent having a particle size of 200 mesh or more is 80wt% or more.
Preferably, in the step (2), the weight ratio of the amount of the blowing slag to the amount of the reducing agent is 100:5 to 15.
Preferably, in the step (2), the vulcanizing agent is sulfur, and the amount of the vulcanizing agent having a particle size of 200 mesh or more is 80wt% or more.
Preferably, in the step (2), the weight ratio of the blowing slag to the vulcanizing agent is 100:3 to 5.
Preferably, in the step (2), the volume concentration of the oxygen in the oxygen-enriched air II is 60-80%, and the pressure of the injected oxygen-enriched air II is 0.2-0.4 MPa.
According to a preferred embodiment, in step (2), the reducing agent is injected into the oxygen-rich slag-depleted bath reaction zone by means of compressed air at a pressure of 0.6MPa to 0.8MPa, and the sulfidizing agent is injected into the oxygen-rich slag-depleted bath reaction zone by means of nitrogen at a pressure of 0.6MPa to 0.8 MPa.
Preferably, in the step (2), the conditions of the reduction and vulcanization reaction are controlled so that the metallization rate Me of the high-cobalt low-nickel matte is realized Form(s) of 0.20 to 0.4; wherein Me is Form(s) of ＝(S Theory of the invention -S Practice of )/S Theory of the invention ，S Theory of the invention Is the theoretical mass content of sulfur element in high-cobalt low-nickel matte, S In fact Is the actual mass content of sulfur element in high cobalt low nickel matte, high cobaltThe theoretical mass content of the sulfur element in the low grade nickel matte is the theoretical sulfur content when the iron element, the nickel element and the cobalt element in the high cobalt low grade nickel matte are completely vulcanized.
Preferably, in the step (2), the time of the blown slag participating in the reduction vulcanization reaction in the slag depletion furnace is 1.5-2.0h, the slag tapping time of the blown slag is 2-3h, and the slag tapping time interval of the depleted slag is 2-3h.
The utility model discloses in, the interval of high cobalt low ice nickel slagging is decided according to the sediment material volume.
The following description of the preferred embodiment of the method for producing high nickel matte from low nickel matte according to the present invention is provided with reference to fig. 1, and the method comprises:
(1) Solid low nickel matte (namely the low nickel matte shown in figure 1) and a flux I (namely the quartz stone shown in figure 1) are mixed by a metering belt and then are continuously introduced into an oxygen-enriched converting furnace for converting, oxygen-enriched air I is sprayed into a molten pool of the oxygen-enriched converting furnace through a primary air port of a furnace body of a molten pool reaction area, pulverized coal (namely the coal shown in figure 1) is sprayed into a primary air port of the oxygen-enriched converting furnace, and secondary air is introduced into the oxygen-enriched converting furnace at the same time to produce high nickel matte, converting slag and converting smoke; water quenching the intermittently discharged high nickel matte; discharging the blown slag from an end slag tap every 2-3 hours, allowing the blown slag to flow into the slag-depleting furnace in the step (2) through a slag chute, sequentially passing the blown flue gas through a waste heat boiler to recover waste heat, and introducing the blown flue gas into a flue gas acid making system for post-treatment after dust removal by an electric dust remover;
controlling the conditions to ensure that the mass ratio of the iron element to the silicon dioxide in the blowing slag is 1.5-2.5:1; the volume concentration of oxygen in the oxygen-enriched air I is 40-70%, and the pressure of the sprayed oxygen-enriched air I is 0.08-0.2 MPa; the spraying amount of the pulverized coal is 1 to 3 weight percent of the amount of the materials fed into the furnace; the blowing temperature in the oxygen-enriched blowing furnace is 1250-1350 ℃;
(2) Spraying a flux II (specifically shown as 'limestone' in figure 1), a reducing agent, a vulcanizing agent, oxygen-enriched air II and blown slag into a slag depletion furnace of a slag oxygen-enriched depletion molten pool reaction area to carry out reduction vulcanization reaction, simultaneously introducing secondary oxygen-enriched gas into the slag oxygen-enriched depletion molten pool reaction area,controlling the conditions of the reduction and vulcanization reaction to ensure that the metallization rate Me of the high-cobalt low-nickel matte Form(s) of 0.20-0.4, high-cobalt low-nickel matte, depleted slag and high-temperature flue gas are produced; spraying a reducing agent through compressed air, and spraying a vulcanizing agent through nitrogen;
controlling the oxygen excess coefficient alpha of the oxygen-enriched air II to the reducing agent to be 0.4-0.5; controlling the temperature of a slag dilution furnace in a slag oxygen enrichment dilution molten pool reaction zone to be 1250-1400 ℃; the pressure of the compressed air is 0.6Mpa to 0.8Mpa; the pressure of nitrogen is 0.6 Mpa-0.8 Mpa; the introduction amount of the flux II is such that the slag in the slag-depleted furnace is CaO/SiO 2 In a weight ratio of 0.3:1 to 0.6:1; the weight ratio of the blowing slag to the reducing agent is 100:5 to 15 percent; the weight ratio of the blowing slag to the vulcanizing agent is 100:3 to 5; the volume concentration of oxygen in the oxygen-enriched air II is 60-80%, and the pressure of the oxygen-enriched air II is 0.2-0.4 MPa.
The utility model discloses a low nickel matte carries out the converting oxidation in the oxygen boosting converting furnace, and high nickel matte of output and converting sediment, converting sediment get into the sediment and impound the stove and carry out the reduction vulcanization, and the low nickel matte that obtains can return the oxygen boosting converting furnace and continue the converting. In the step (1), nickel sulfide and iron sulfide need to be converted into nickel oxide, iron oxide and sulfur dioxide in the oxygen-enriched converting furnace, and impurities such as iron and sulfur need to be removed through oxidation, so that more oxygen is needed, and meanwhile, a flux needs to be added to separate impurities such as iron oxide in the melt.
In the step (2), the slag depletion furnace needs to reduce and sulfide nickel oxide in the blowing slag into nickel sulfide for enrichment, and if the oxygen content is too high, the reduction is insufficient, so that the nickel enrichment effect is poor. In order to obtain higher nickel yield, the utility model controls the oxidation reduction degree by respectively controlling the oxygen concentration and pressure, temperature of the oxygen-enriched air sprayed into the oxygen-enriched converting furnace and the slag dilution furnace, the proportion of other raw materials, the charging method and the like.
As mentioned before, the utility model discloses a second aspect provides a low nickel matte produces high nickel matte's device, includes in the device:
an oxygen-enriched converting furnace;
a slag depletion furnace;
the slag chute is connected with the oxygen-enriched converting furnace and the slag depleting furnace;
the oxygen-enriched converting furnace and the slag dilution furnace both comprise vertical fixed furnace bodies;
the vertical fixed furnace body comprises a gas phase zone furnace body, a furnace top cover, a molten pool reaction zone furnace body formed by adopting a water cooling structure, and a furnace hearth built by refractory materials;
the furnace hearth is provided with a slag tap and a siphon channel, a shell of the furnace hearth consists of a steel frame, a pull rod and a spring part, the spring part is positioned between the steel frame and the pull rod, and the shell of the furnace hearth is of an elastic structure.
Preferably, the vertical fixed furnace body also comprises a flue.
Preferably, in the furnace body of the reaction zone of the molten pool, the water cooling structure is formed by combining a plurality of layers of water cooling pieces, and the water cooling pieces are copper water jackets or molten steel jackets; the water cooling piece positioned at the lowest part of the furnace body is a layer of water cooling piece, the upper part of the layer of water cooling piece is a layer of water cooling piece, and the layer of water cooling piece is provided with at least two primary air ports; the angle of the tuyere is-5 to 5 degrees in the horizontal direction;
a primary tuyere of the oxygen-enriched converting furnace is used for spraying oxygen-enriched air I, and a primary tuyere of the slag-depleting furnace is used for spraying oxygen-enriched air II, a reducing agent and a vulcanizing agent; and a feeding hole of the slag-depleting furnace is used for adding a fusing agent II.
Preferably, the gas phase zone furnace body is formed by alternately adopting refractory brickworks and water-cooling water jacket structures, and the thickness of the refractory brickworks between the water-cooling water jacket structures is 200 mm-400 mm respectively and independently.
Preferably, the furnace top cover adopts a water cooling structure, the water cooling structure is formed by combining a plurality of layers of water cooling pieces, the water cooling pieces are copper water jackets or steel water jackets, and the furnace top cover is provided with at least 1 feeding hole.
Preferably, a slag tap is arranged at one end of the furnace body of the reaction zone of the molten pool, which is higher than the tuyere.
Preferably, the water jackets of the reaction zones of the oxygen-enriched converting furnace and the slag-depleting furnace are connected with the steel frame through pull rods.
The following describes a preferred embodiment of the apparatus for producing high nickel matte from low nickel matte according to the present invention with reference to fig. 2 and 3, wherein the apparatus comprises:
an oxygen-enriched converting furnace a;
a slag dilution furnace c;
the slag chute b is connected with the oxygen-enriched converting furnace a and the slag dilution furnace c;
the oxygen-enriched converting furnace a and the slag depletion furnace c both comprise vertical fixed furnace bodies;
the vertical fixed furnace body comprises a gas phase zone furnace body, a furnace top cover 10, a molten pool reaction zone furnace body formed by adopting a water cooling structure, and a furnace hearth 1 built by refractory materials;
the slag tap 13 and the siphon channel are arranged on the hearth 1, the shell of the hearth 1 is composed of a steel frame 16, a pull rod 17 and a spring part, the spring part is positioned between the steel frame and the pull rod, and the shell of the hearth is of an elastic structure.
Preferably, a nickel matte discharge port 15 is provided on the hearth 1 to discharge high-cobalt low-nickel matte.
Preferably, the upper surface of the hearth 1 is provided with a flat water jacket 2.
Preferably, in the furnace body of the reaction zone of the molten pool, the water cooling structure is formed by combining a plurality of layers of water cooling pieces, and the water cooling pieces are copper water jackets or molten steel jackets; the water cooling piece at the lowest part of the furnace body is a layer of water cooling piece 3, the upper part of the layer of water cooling piece 3 is a layer of water cooling piece 4, wherein, the layer of water cooling piece 3 is provided with at least two primary air ports 14; the angle of the primary air port is-5 to 5 degrees in the horizontal direction.
Preferably, the two-layer water cooling member 4 is provided with not less than two secondary tuyeres 12.
Preferably, the angle of each secondary tuyere is each independently 0 ° to 30 ° downward in the horizontal direction.
Preferably, the cross-sectional area ratio of the primary tuyere of the oxygen-enriched converting furnace a to the primary tuyere of the slag-depleted furnace c is 1.1 to 1.25:1.
preferably, the oxygen-rich converting furnace is located higher than the slag-depleted furnace.
Preferably, the gas phase zone furnace body is formed by adopting a structure of refractory brickworks 5 and water-cooling water jackets 6 in an alternating mode, and the thickness of the refractory brickworks between the water-cooling water jacket structures is 200 mm-400 mm independently.
Preferably, three air ports 11 are arranged on two sides of the furnace body of the gas phase zone and used for injecting air or oxygen-enriched air into the furnace, and the angle of each three air port is 0-30 degrees downwards along the horizontal direction independently.
Preferably, the furnace top cover 10 is provided with a smoke exhaust flue 7, a flue water jacket 8.
Preferably, the furnace top cover 10 adopts a water cooling structure, the water cooling structure is formed by combining a plurality of layers of water cooling pieces, the water cooling pieces are copper water jackets or molten steel jackets, and the furnace top cover 10 is provided with at least 1 feeding hole 9.
Preferably, the water jackets of the reaction zones of the oxygen-enriched converting furnace and the slag-depleting furnace are connected with the steel frame 16 through a pull rod 17.
Preferably, a slag tap 13 is arranged at one end of the furnace body of the reaction zone of the molten pool, which is higher than the tuyere.
The utility model provides a scheme has characteristics such as process flow is short, the energy consumption is low, the environmental protection is effectual, degree of automation is high, specifically, the utility model has the following advantages:
(1) The utility model adopts continuous feeding, continuous oxygen-enriched blowing and a little excess of vulcanizing agent, so that the concentration of the sulfur dioxide in the flue gas is high and stable, which is beneficial to the acid making of the flue gas, and solves the problems of large concentration fluctuation and low-altitude pollution of the sulfur dioxide in the flue gas blown by the low-nickel matte converter at present;
(2) The utility model adopts cold charge blowing, the blowing system can be separated from the melting and independently run, and the problem that the cold charge is difficult to independently run in the blowing because the hot charge blowing of the converter must be configured with the melting at present is solved;
(3) The special converting and slag dilution device adopted by the utility model reduces the temperature, and the tuyere area adopts the water cooling structure of the copper water jacket or the steel water jacket, so that the service life of the furnace body is longer, and the problem of short service cycle caused by overhigh temperature of the refractory material masonry of the converter body, especially the refractory material masonry of the tuyere area, in the converter blowing at present is solved;
(4) The utility model adopts the thermal state blowing slag to flow into the slag depletion furnace through the slag chute, and the reduction and vulcanization reaction is carried out in the slag depletion furnace, so that the nickel and cobalt are fully recovered, the high-cobalt low nickel matte can be produced, the low nickel matte obtained by the reduction and enrichment can be obtained, and the problem of low recovery rate of the nickel and cobalt can be solved;
(5) The utility model discloses a have the cubic wind gap on the oxygen boosting converting furnace, improved the volume that lets in of oxygen boosting to through the ratio of control raw materials, make sediment and high nickel matte separation effect better, thereby improved the purity of high nickel matte.
The present invention will be described in detail below by way of examples. In the following examples, the raw materials used are all ordinary commercial products unless otherwise specified.
The following examples were carried out using the process flow shown in FIG. 1, unless otherwise specified.
The solid low grade nickel matte has a composition of, calculated on element basis, 22.5wt% nickel, 49.09wt% Fe, 0.81wt% cobalt, 27.6wt% sulfur.
The following nickel recovery rate = [ (the sum of the mass of nickel elements in the high nickel matte product and the high cobalt low nickel matte product)/the mass of nickel elements in the solid low nickel matte raw material ] × 100%;
the following cobalt recovery = [ (the sum of the mass of cobalt elements in the high nickel matte product and the high cobalt low nickel matte product)/the mass of cobalt elements in the low nickel matte material ] × 100%.
Example 1
(1) Solid low nickel matte and quartz stone are proportioned by a metering belt and then are continuously introduced into an oxygen-enriched converting furnace through a charging hole for converting, oxygen-enriched air I is sprayed into a molten pool of the oxygen-enriched converting furnace through a primary air port of a furnace body of a molten pool reaction area, pulverized coal is sprayed into a primary air port of the oxygen-enriched converting furnace, and high nickel matte, converting slag and converting smoke are produced; discharging the high nickel matte intermittently and water quenching; blowing slag is discharged from an end slag tap every 2 hours and flows into the slag depletion furnace in the step (2) through a slag chute, and blowing flue gas is introduced into a flue gas acid making system for post-treatment after sequentially passing through a waste heat boiler to recover waste heat and an electric dust remover to remove dust;
controlling the conditions to ensure that the mass ratio of the iron element to the silicon dioxide in the blowing slag is 2.0:1; the volume concentration of oxygen in the oxygen-enriched air I is 50 percent, and the pressure of the oxygen-enriched air is 0.2Mpa; the spraying amount of the pulverized coal is 1wt% of the amount of the materials fed into the furnace; the blowing temperature in the oxygen-enriched blowing furnace is 1250 ℃;
(2) After the blowing slag flows into the slag dilution furnace through the slag chute, limestone is added through a feeding hole, a reducing agent, a vulcanizing agent and oxygen-enriched air II are sprayed into the slag dilution furnace in the slag oxygen-enriched dilution bath reaction area through a primary air port to carry out reduction vulcanization reaction, and the conditions of the reduction vulcanization reaction are controlled, so that the metallization rate Me of the high-cobalt low-nickel matte is realized Form(s) of 0.20, producing high-cobalt low-nickel matte and depleted slag; spraying a reducing agent through compressed air, and spraying a vulcanizing agent through nitrogen;
controlling the oxygen excess coefficient alpha of the oxygen-enriched air II to the reducing agent to be 0.4; controlling the temperature in a slag dilution furnace in the slag oxygen enrichment dilution molten pool reaction zone to be 1250 ℃; the pressure of the compressed air is 0.6Mpa; the pressure of nitrogen is 0.6Mpa; the quantity of flux II (calcium oxide) being such that the slag in the slag-depleted furnace is CaO/SiO 2 In a weight ratio of 0.3:1; the weight ratio of the blowing slag to the reducing agent (anthracite) is 100:5; the weight ratio of the blowing slag to a vulcanizing agent (sulfur) is 100:3; the volume concentration of oxygen in the oxygen-enriched air II is 80%, and the pressure of the oxygen-enriched air II is 0.3Mpa.
The converting flue gas is introduced into a flue gas acid making system for post-treatment after sequentially passing through a waste heat boiler to recover waste heat and an electric dust remover to remove dust.
As a result:
high nickel matte: based on the mass content of the elements, ni was 73.94%, co was 1.82%, fe was 1.8%, and S was 21.77%.
High cobalt low nickel matte: based on the mass content of the elements, ni was 20.50%, co was 4.60%, fe was 45.44%, and S was 28.20%.
The nickel recovery rate was 99.5% and the cobalt recovery rate was 86.3%.
Example 2
This example was carried out using a similar process to that of example 1, except that in this example:
(1) The spraying amount of the pulverized coal is 2wt% of the amount of the materials fed into the furnace; the blowing temperature in the oxygen-enriched blowing furnace is 1300 ℃;
(2) Controlling the oxygen excess coefficient alpha of the oxygen-enriched air II to the reducing agent to be 0.5; controlling the temperature in a slag dilution furnace in the slag oxygen-enriched dilution molten pool reaction zone to be 1300 ℃; the weight ratio of the blowing slag to the reducing agent (pulverized coal) is 100:10; the weight ratio of the blowing slag to a vulcanizing agent (sulfur) is 100:4.
as a result:
high nickel matte: based on the element contents, ni was 74.52%, co was 1.92%, fe was 1.25%, and S was 21.86%.
High cobalt low nickel matte: based on the element contents, ni was 22.60%, co was 4.77%, fe was 50.35%, and S was 29.16%.
The nickel recovery rate was 99.41% and the cobalt recovery rate was 85.32%.
Example 3
This example was carried out using a similar process to that of example 1, except that in this example:
(1) The spraying amount of the pulverized coal is 3 percent of the amount of the materials fed into the furnace;
(2) Controlling the oxygen surplus coefficient alpha of the oxygen-enriched air II to the reducing agent to be 0.5; the weight ratio of the blowing slag to the reducing agent (pulverized coal) is 100:15; the weight ratio of the blowing slag to a vulcanizing agent (sulfur) is 100:5.
as a result:
high nickel matte: based on the element contents by mass, ni was 75.52%, co was 1.72%, fe was 1.05%, and S was 22.13%.
High cobalt low nickel matte: based on the mass content of the elements, ni was 25.10%, co was 5.32%, fe was 39.92%, and S was 29.20%.
The nickel recovery rate is 99.6 percent, and the cobalt recovery rate is 88.32 percent.
Example 4
This example was carried out using a similar process to example 1, except that in this example:
(1) Controlling the conditions to ensure that the mass ratio of the iron element to the silicon dioxide in the blowing slag is 1.8:1; the volume concentration of oxygen in the oxygen-enriched air I is 60 percent, and the pressure of the oxygen-enriched air is 0.2Mpa; the blowing temperature in the oxygen-enriched blowing furnace is 1350 ℃;
(2) The flux II (calcium oxide) is introduced in such an amount that the slag is depleted in CaO/SiO of the slag in the furnace 2 In a weight ratio of 0.4:1; volume of oxygen in oxygen-enriched air IIThe concentration is 80 percent, and the pressure of the oxygen-enriched air II is 0.4Mpa; the temperature in the slag-depleted furnace in the slag-enriched oxygen-depleted bath reaction zone is controlled to 1350 ℃.
High nickel matte: based on the element contents, ni was 74.38%, co was 1.45%, fe was 1.65%, and S was 21.23%.
High cobalt low nickel matte: based on the element contents by mass, ni was 25.20%, co was 6.37%, fe was 39.62%, and S was 27.50%.
The nickel recovery was 99.52% and the cobalt recovery was 89.32%.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. In the technical concept scope of the present invention, it can be right to perform multiple simple modifications to the technical solution of the present invention, including each technical feature combined in any other suitable manner, these simple modifications and combinations should be considered as the disclosed content of the present invention, all belonging to the protection scope of the present invention.
Claims (10)
1. An apparatus for producing high nickel matte from low nickel matte is characterized in that the apparatus comprises:
an oxygen-enriched converting furnace;
a slag depletion furnace;
a slag chute connecting the oxygen-enriched converting furnace and the slag-depleting furnace;
the oxygen-enriched converting furnace and the slag depletion furnace both comprise vertical fixed furnace bodies;
the vertical fixed furnace body comprises a gas phase zone furnace body, a furnace top cover, a molten pool reaction zone furnace body formed by adopting a water cooling structure, and a furnace hearth built by refractory materials;
the furnace hearth is provided with a slag tap and a siphon, the shell of the furnace hearth consists of a steel frame, a pull rod and a spring part, the spring part is positioned between the steel frame and the pull rod, and the shell of the furnace hearth is of an elastic structure.
2. The apparatus according to claim 1, wherein in the molten bath reaction zone shaft, the water-cooling structure is combined by a plurality of water-cooling pieces, and the water-cooling pieces are copper water jackets or molten steel jackets; the water cooling piece positioned at the lowest part of the furnace body is a layer of water cooling piece, the upper part of the layer of water cooling piece is a layer of water cooling piece, and the layer of water cooling piece is provided with at least two primary air ports; the angle of the primary air port is-5 to 5 degrees in the horizontal direction.
3. The apparatus of claim 1, wherein the gas phase zone furnace body is formed by alternately adopting refractory brickworks and water-cooling water jacket structures, and the thickness of the refractory brickworks between the water-cooling water jacket structures is 200 mm-400 mm respectively and independently.
4. The device of claim 1, wherein the furnace top cover adopts a water cooling structure, the water cooling structure is formed by combining a plurality of layers of water cooling pieces, and the water cooling pieces are copper water jackets or molten steel jackets; the furnace top cover is provided with at least 1 feeding hole.
5. The apparatus of claim 1, wherein a slag tap is provided at an end of the reaction zone shaft of the molten bath higher than the tuyere.
6. The apparatus of claim 1, further comprising a flue in the vertical stationary furnace.
7. The apparatus of claim 1, wherein the bath reaction zone water jackets of the oxygen-enriched converting furnace and the slag-depleting furnace are connected to the steel frame by tie rods.
8. The apparatus of claim 2, wherein the two-layer water cooling member is provided with not less than two secondary tuyeres.
9. The apparatus of claim 8 wherein the angle of each secondary tuyere is independently 0 ° to 30 ° downward in the horizontal direction.
10. The apparatus according to claim 2, wherein the cross-sectional area ratio of the primary tuyere of the oxygen-rich converting furnace to the primary tuyere of the slag-depleting furnace is 1.1 to 1.25:1.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024046244A1 (en) * | 2022-08-30 | 2024-03-07 | 中伟新材料股份有限公司 | Method and apparatus for producing high-nickel matte from low-nickel matte |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024046244A1 (en) * | 2022-08-30 | 2024-03-07 | 中伟新材料股份有限公司 | Method and apparatus for producing high-nickel matte from low-nickel matte |
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