CN115772590A - Method for recycling steel washing sand in submerged arc furnace - Google Patents
Method for recycling steel washing sand in submerged arc furnace Download PDFInfo
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- CN115772590A CN115772590A CN202211528308.4A CN202211528308A CN115772590A CN 115772590 A CN115772590 A CN 115772590A CN 202211528308 A CN202211528308 A CN 202211528308A CN 115772590 A CN115772590 A CN 115772590A
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- nickel
- steel
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- laterite
- ore
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 79
- 239000010959 steel Substances 0.000 title claims abstract description 79
- 239000004576 sand Substances 0.000 title claims abstract description 77
- 238000005406 washing Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000004064 recycling Methods 0.000 title claims abstract description 38
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 97
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 83
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 claims abstract description 37
- 239000002994 raw material Substances 0.000 claims abstract description 37
- 229910052742 iron Inorganic materials 0.000 claims abstract description 27
- 239000000571 coke Substances 0.000 claims abstract description 19
- 238000003723 Smelting Methods 0.000 claims abstract description 18
- 238000001035 drying Methods 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 239000012535 impurity Substances 0.000 claims description 14
- 239000002802 bituminous coal Substances 0.000 claims description 11
- 239000002699 waste material Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000003245 coal Substances 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 6
- 239000002893 slag Substances 0.000 description 18
- 238000009628 steelmaking Methods 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 7
- 230000009467 reduction Effects 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000011651 chromium Substances 0.000 description 2
- 230000003203 everyday effect Effects 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000863 Ferronickel Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011504 laterite Substances 0.000 description 1
- 229910001710 laterite Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a method for recycling steel washing sand in an ore furnace, which comprises the following steps: (1) Drying the laterite-nickel ore in a drying kiln to obtain dried laterite-nickel ore; (2) Mixing the washed steel grit and the dried laterite-nickel ore to obtain a production raw material, and adding the production raw material and semi coke into a rotary kiln to perform roasting treatment to obtain roasted sand; (3) And smelting the roasted sand in an ore smelting furnace to obtain the high-nickel molten iron. According to the invention, the steel-washing sand is recycled by using the submerged arc furnace, and can be directly mixed with the dried laterite-nickel ore without additional treatment on the steel-washing sand, so that the recycling cost of the steel-washing sand is greatly reduced, the production cost of producing high-nickel molten iron from the laterite-nickel ore can be reduced, and the method has very high practical application value and economic benefit.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for recycling steel washing sand in an ore smelting furnace.
Background
The waste slag generated in the steel smelting process is the dry slag for steelmaking, the main components of the dry slag are oxides of calcium, iron, silicon, magnesium and chromium, a small amount of oxides of aluminum, manganese and nickel, and the like, the dry slag is further treated to recover iron-containing resources, and steel washing sand with the main components of 70% -76% of Fe, 6% -9% of Cr and 1% -1.3% of Ni is obtained through screening. The washed steel sand screened from the steelmaking dry slag is returned to a steelmaking return furnace to be recycled as a steelmaking raw material, and the tailings can be further recycled as cement, a brick making raw material and a paving raw material, so that the pollution to the environment caused by the emission of the steelmaking dry slag is reduced, and the comprehensive utilization of solid waste resources is realized.
In the prior art, steel washing sand is smelted in a steel making process, but the steel washing sand screened from dry steelmaking slag contains 4-10% of water and cannot be directly added into an AOD furnace for smelting, and the steel washing sand is powdery and has small granularity, and is easy to be bonded into large blocks if being directly dried, so that the steel washing sand needs to be pressed into small balls before being added into the AOD furnace and then is dried, and the cost for recycling the steel washing sand is greatly increased.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for recycling steel washing sand in an ore smelting furnace, and solves the problem of high steel washing sand recycling cost in the prior art; according to the invention, the steel washing sand and the dried laterite-nickel ore are mixed to obtain a production raw material, then the production raw material is roasted in a rotary kiln to obtain roasted sand, and then the roasted sand is directly smelted in an ore furnace to obtain high-nickel molten iron; the method has the advantages that the yield of the submerged arc furnace can be improved by utilizing the high metal element content, less impurities and easy reduction in the steel grit washing, and compared with the method for preparing the high-nickel molten iron by independently using the laterite-nickel ore as a production raw material, the addition of the steel grit washing can obviously reduce the fuel consumption, thereby reducing the production cost of the high-nickel molten iron. In addition, the steel-washing sand is recycled by using the submerged arc furnace, and can be directly mixed with the dried laterite-nickel ore without additional treatment on the steel-washing sand, so that the recycling cost of the steel-washing sand is greatly reduced, the production cost of producing high-nickel molten iron by using the laterite-nickel ore can be reduced, and the method has high practical application value and economic benefit.
In order to realize the aim, the invention provides a method for recycling steel washing sand by an ore furnace, which adopts the following technical scheme:
a method for recycling steel washing sand in an ore furnace comprises the following steps:
(1) Drying the laterite-nickel ore in a drying kiln to obtain dried laterite-nickel ore;
(2) Mixing the washed steel grit and the dried laterite-nickel ore to obtain a production raw material, and adding the production raw material and semi coke into a rotary kiln to carry out roasting treatment to obtain roasted sand;
(3) And smelting the roasted sand in an ore smelting furnace to obtain the high-nickel molten iron.
According to the invention, the washed steel grit has high metal element content, less impurities and easy reduction, is used as a part of production raw materials, is roasted by a rotary kiln to obtain roasted sand, and is directly smelted by an ore furnace to obtain high-nickel molten iron, compared with the method that the roasted sand is firstly pressed into pellets and then dried and is recycled as a steelmaking raw material in an AOD furnace, the method for recycling the washed steel grit by the ore furnace can be directly used without additional treatment on the washed steel grit, the recycling cost of the washed steel grit is greatly reduced, and the production cost of producing the high-nickel molten iron by the laterite-nickel ore can also be reduced; the method solves the problem of high recycling cost of steel washing sand in the prior art, can improve the yield of high-nickel molten iron, further reduces the consumption of the laterite-nickel ore, relieves the situation that the high-grade laterite-nickel ore is difficult to purchase, and solves the problem that the ore metal amount used by the submerged arc furnace is low, so that the economic and technical indexes of the submerged arc furnace are high, and has high practical application value and economic benefit. In the invention, the semi-coke is used as fuel and reducing agent, can provide heat source and play a role in pre-reduction for production raw materials in the rotary kiln, and can provide partial heat and play a role in reduction for roasted sand in the submerged arc furnace; in addition, bituminous coal is used as another part of fuel of the rotary kiln, and is injected from a pipeline of the rotary kiln through compressed air, and then bituminous coal powder is ignited from a coal injection port, wherein the injection distance of the bituminous coal powder is the flame length.
In the method for recycling steel washing sand by the submerged arc furnace, as a preferred embodiment, in the step (1), the mass ratio of the high-nickel laterite-nickel ore in the laterite-nickel ore is 45% -80% (such as 46%, 50%, 55%, 60%, 65%, 70%, 75%);
preferably, the mass percent of each element in the high-nickel laterite-nickel ore is that Ni is more than or equal to 1.7%, TFe:14% -20% (e.g. 14.5%, 15%, 16%, 17%, 18%, 19%, 19.5%) SiO 2 /MgO≥1.6，Al 2 O 3 Less than or equal to 5 percent, and the balance of inevitable water and impurities;
preferably, the moisture content of the dried lateritic nickel ore is 18-24% (such as 18.5%, 19%, 20%, 21%, 22%, 23%, 23.5%).
In the invention, the moisture content of the dried laterite-nickel ore obtained after drying treatment is limited to 18-24%, if the moisture content is too low, the laterite-nickel ore has more powder, and the powder is easy to sinter into kiln coatings in a rotary kiln; if the moisture content is too high, the adhesive is easy to adhere to the sieve plate wall at the outlet of the drying kiln.
In the method for recycling steel washing sand in the submerged arc furnace, as a preferred embodiment, in the step (2), the production raw materials comprise, by mass: 3% -5% (such as 3.2%, 3.5%, 3.8%, 4%, 4.2%, 4.5%, 4.8%) of steel grit washing, and 95% -97% (such as 95.2%, 95.5%, 95.8%, 96%, 96.2%, 96.5%, 96.8%) of dried laterite-nickel ore.
The quality of the steel washing sand is limited to 3% -5% of the production raw material, and the metal elements in the steel washing sand can be recycled to the maximum extent and the recycling cost can be reduced within the range; if the steel grit is excessively added, the resistivity between electrodes of the submerged arc furnace is reduced, the current of the electrodes is increased, the positions of the electrodes are lifted, a crucible area moves upwards, the heat loss is increased, the maintenance of the furnace condition of the submerged arc furnace is not facilitated, finally, due to the fact that the furnace condition is variable and the experience difference is poor, the judgment of a single working end is mistaken, the deviation of the pressure and discharge times is large, the working end is overlong or too short, and the electrode loss is caused to be overlarge.
In the method for recycling steel grit washing in the submerged arc furnace, as a preferred embodiment, the steel grit washing comprises the following elements in percentage by mass: 70% -76% (such as 70.5%, 71%, 72%, 73%, 74%, 75%, 75.5%), cr:6% -9% (e.g., 6.2%, 6.5%, 7%, 7.5%, 8%, 8.5%, 8.8%), ni:1 to 1.3 percent (such as 1.05 percent, 1.1 percent, 1.15 percent, 1.2 percent, 1.22 percent, 1.25 percent and 1.28 percent), and the balance of waste residue and inevitable water (the main component of the waste residue is SiO) 2 MgO, caO, mnO); preferably, the grit size of the steel grit is 10-150 μm (e.g., 20 μm, 40 μm, 50 μm, 70 μm, 90 μm, 100 μm, 120 μm).
The waste slag in the steel washing sand floats above the high-nickel molten iron because the density of the waste slag after being melted is lower than that of the high-nickel molten iron, and is discharged together with the slag generated by the laterite-nickel ore through a slag outlet of the submerged arc furnace in the smelting treatment process.
In the method for recycling steel grit in the submerged arc furnace, as a preferred embodiment, in the step (2), the semi coke accounts for 4 to 6.5 percent (such as 4.2 percent, 4.5 percent, 4.8 percent, 5 percent, 5.5 percent, 6 percent and 6.2 percent) of the mass of the production raw material;
preferably, in the roasting treatment, the rotating speed of the rotary kiln is 400-900r/min (such as 500r/min, 600r/min, 700r/min and 800 r/min);
preferably, the mass of the production raw materials and the semi coke added into the rotary kiln is 30-80t/h (such as 40t/h, 50t/h, 60t/h and 70 t/h);
preferably, the bituminous coal is sprayed out of the pipeline of the rotary kiln through compressed air, and the coal spraying amount of the bituminous coal is controlled to be less than 8t/h;
preferably, the temperature of the calcination sand is 750 to 850 ℃ (such as 760 ℃, 770 ℃, 780 ℃, 800 ℃, 810 ℃, 820 ℃, 840 ℃).
The temperature of the roasted sand obtained after roasting treatment is limited to 750-850 ℃, and the roasted sand can be ensured to be pre-reduced in the temperature range, so that the energy consumption of subsequent reduction smelting in the submerged arc furnace is reduced. In the invention, the semi-coke accounts for 4-6.5% of the mass of the production raw material by limiting, and the method is favorable for recycling metal elements in the steel washing sand to the maximum extent in the range; if the quality of the semi-coke is excessively added, the content of Si in the high-nickel molten iron is excessively high, so that the obtained high-nickel molten iron is unqualified; if the addition amount of the semi coke is too small, the reduction is insufficient, so that the metal recovery rate is low, particularly the recovery rate of iron element is low, and the molten iron is unqualified; in addition, if the addition amount of the semi-coke is too small, the temperature in the rotary kiln is reduced, the furnace condition is unstable, and the production is influenced.
In the method for recycling steel grit in the submerged arc furnace, as a preferred embodiment, in the step (2), in the roasting treatment, the position of the high temperature zone of the rotary kiln is changed by adjusting the opening and closing of a turning plate of an induced draft fan bellows of the rotary kiln.
The invention has small granularity of steel washing sand, and the steel washing sand is easy to sinter to form kiln skin when being roasted in the rotary kiln, so that the load of equipment is increased, the roasting sand at the same position is prevented from being fused and adhered to form a large piece of kiln skin because the air box turning plate of the induced draft fan at the rear part of the rotary kiln is adjusted to be opened and closed, and the position of a high-temperature point in the coal spraying process is moved, and the high-temperature area is pulled back and forth by adjusting the opening and closing of the air box turning plate of the induced draft fan of the rotary kiln to avoid the generation of the kiln skin.
In the method for recycling steel washing sand by the submerged arc furnace, as a preferred embodiment, in the step (3), in the smelting process, the electrode current of the submerged arc furnace is controlled to be 43000A to 50000A (such as 45000A, 46000A, 47000A, 48000A and 49000A).
In the method for recycling steel grit in the submerged arc furnace, as a preferred embodiment, in the step (3), the temperature of the molten high-nickel iron is 1500-1600 ℃ (such as 1520 ℃, 1540 ℃, 1550 ℃, 1570 ℃ and 1590 ℃); preferably, the mass percentage of each element in the ferronickel water is C:1% -4% (such as 1.5%, 2%, 2.5%, 3%, 3.2%, 3.5%, 3.8%), ni:7% -12% (e.g., 7.5%, 8%, 8.5%, 9%, 10%, 11%, 11.5%), cr:0.5% -6% (e.g. 0.6%, 1%, 2%, 3%, 4%, 5%), si: 0.3-4% (such as 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%), P is less than or equal to 0.05%, S is less than or equal to 0.35%, and the balance is Fe and unavoidable impurities.
Compared with the prior art, the invention has the following advantages:
the method for recycling the steel grit in the submerged arc furnace can be directly used without additional treatment on the steel grit, and compared with the prior art that the steel grit is pressed into pellets and then dried in the AOD furnace to be recycled as a steelmaking raw material, the method greatly reduces the recycling cost of the steel grit, and can also reduce the production cost of producing high-nickel molten iron from the laterite-nickel ore.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiments of the present invention are implemented on the premise of the technical scheme of the present invention, and detailed embodiments and processes are given, but the scope of the present invention is not limited to the following embodiments, and the following embodiments do not indicate process parameters of specific conditions, and generally follow conventional conditions.
The endpoints of the ranges and any values disclosed in the present application are not limited to the precise range or value and should be understood to encompass values close to these ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual values, and between the individual values 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.
In the present invention, all numerical values relating to amounts of components are "parts by weight" throughout, unless otherwise specified and/or indicated. The process parameters for the following examples, without specifying the particular conditions, are generally in accordance with conventional conditions. The starting materials described in the following examples are all commercially available from the public.
The specific embodiment of the invention provides a method for recycling steel washing sand by an ore furnace, which comprises the following steps:
step (1), transporting steel washing sand screened from dry steelmaking slag by a slag factory to a submerged arc furnace raw material warehouse for later use, wherein the steel washing sand comprises the following elements in percentage by mass as TFe:70% -76%, cr:6% -9%, ni:1 to 1.3 percent of the total weight of the waste slag, and the balance of waste slag and inevitable water (the main component of the waste slag is SiO) 2 MgO, caO, mnO); the granularity of the steel washing sand is 10-150 mu m;
step (2), drying the laterite-nickel ore in a drying kiln to obtain dried laterite-nickel ore with the moisture content of 18% -24%, wherein the mass percentage of the high-nickel laterite-nickel ore in the laterite-nickel ore is 45% -80%; the mass percent of each element in the high-nickel laterite-nickel ore is that Ni is more than or equal to 1.7 percent, TFe:14% -20% of SiO 2 /MgO≥1.6，Al 2 O 3 Less than or equal to 5 percent, and the balance of inevitable water and impurities;
step (3), conveying the steel washing sand to a proportioning bin to be mixed with the dried laterite-nickel ore to obtain a production raw material, wherein the steel washing sand accounts for 3-5% by mass percent, and the dried laterite-nickel ore accounts for 95-97%;
conveying the production raw materials and semi-coke to a rotary kiln through a belt for roasting treatment to obtain roasted sand with the temperature of 750-850 ℃, wherein the mass of the semi-coke accounts for 4-6.5% of the mass of the production raw materials, the mass of the production raw materials and the semi-coke added into the rotary kiln is 30-80t/h, spraying bituminous coal from a pipeline of the rotary kiln through compressed air, and controlling the coal injection amount of the bituminous coal to be less than 8t/h; during the roasting treatment, the rotating speed of the rotary kiln is 400-900r/min; the position of a high-temperature area of the rotary kiln is controlled by adjusting the opening and closing of a turning plate of an air box of an induced draft fan of the rotary kiln;
step (5), hoisting the roasted sand to a high-level bin of the submerged arc furnace, and adding the roasted sand into the submerged arc furnace through a blanking pipe;
step (6), controlling the electrode current of the submerged arc furnace to be 43000A-50000A, and smelting the roasted sand in the current range to obtain high-nickel molten iron with the temperature of 1500-1600 ℃; wherein, the mass percent of each element in the high-nickel iron water is C:1% -4%, ni:7% -12%, cr:0.5% -6%, si:0.3 to 4 percent of the total weight of the alloy, less than or equal to 0.05 percent of P, less than or equal to 0.35 percent of S, and the balance of Fe and inevitable impurities.
The present invention will be described in further detail with reference to specific examples.
Embodiment 1 a method for recycling steel washing sand in a submerged arc furnace, comprising:
(1) Transporting washed steel grit screened from dry steelmaking slag in a slag plant to a submerged arc furnace raw material warehouse for later use, wherein the washed steel grit comprises the following components in percentage by mass: and (4) TFe:70%, cr:8.43%, ni:1.2 percent, and the balance of waste residue and inevitable moisture; the granularity of the steel washing sand is 10-150 mu m;
(2) Drying the laterite-nickel ore in a drying kiln to obtain dried laterite-nickel ore with the moisture content of 20% -24%, wherein the mass ratio of the high-nickel laterite-nickel ore is 50.05%, the medium nickel is 46.95%, and the balance is moisture and inevitable impurities in the laterite-nickel ore in percentage by mass; high nickel redThe nickel-bearing laterite ore comprises the following elements in percentage by mass: 1.78%, TFe:17.57% of SiO 2 ：29.55％、MgO：18.26％、Al 2 O 3 :1.4%, and the balance of unavoidable impurities; the mass percentage of each element in the medium nickel laterite-nickel ore is Ni:1.52%, TFe:16.799% and SiO 2 ：35.87％、MgO：20.66％、Al 2 O 3 :3.8 percent, and the balance of inevitable impurities;
(3) The steel-washing sand is conveyed to a proportioning bin to be mixed with the dried laterite-nickel ore to obtain production raw materials, wherein the production raw materials comprise the following components in percentage by mass: 3% of steel sand washing, and 97% of dried laterite-nickel ore;
(4) Conveying the production raw materials and semi coke to a rotary kiln through a belt for roasting treatment to obtain roasted sand; the quality of the semi-coke accounts for 5% of that of the production raw materials, the rotary kiln rotation speed is 600r/min during roasting, the quality of the production raw materials and the semi-coke added into the rotary kiln is 50t/h, bituminous coal is sprayed out from a coal spraying pipeline of the rotary kiln through compressed air, the coal spraying amount of the bituminous coal is controlled to be 6.2t/h, and during roasting, the position of a high-temperature area of the rotary kiln is controlled by adjusting the turning plate of an air box of an induced draft fan of the rotary kiln to avoid the generation of kiln skin, so that the roasting sand with the temperature of 793 ℃ is obtained.
(5) Hoisting 290t of roasted sand to a high-level bin of the ore furnace, and adding the roasted sand into the ore furnace with the capacity of 36000KV & A through a blanking pipe;
(6) Under the action of large current (a submerged arc furnace is provided with a three-phase electrode, an A-phase electrode 45315A, a B-phase electrode 45126A and a C-phase electrode 46362A), smelting roasted sand to obtain 43.6t of high-nickel molten iron, wherein the smelting time is 312min, the temperature of the high-nickel molten iron is 1582 ℃, and the mass percent of each element in the high-nickel molten iron is C:3.32%, ni:7.29%, cr:4.01%, si:2.20%, P:0.03%, S:0.11%, the balance being Fe and unavoidable impurities.
Comparative example 1 the difference between the comparative example and example 1 is that no steel grit washing is added to the production raw materials, and the rest is the same as that in example 1, 38.75t of molten high nickel iron is obtained, wherein the mass percentages of the elements in the molten high nickel iron are C:2.99%, ni:7.61%, cr:4.22%, si:2.76%, P:0.031%, S:0.108%, the balance being Fe and unavoidable impurities. In the comparative example 1, the yield of the high nickel molten iron obtained is reduced without adding steel grit washing, and if the high nickel molten iron with the same yield as that of the example 1 is obtained, 30.43 tons of laterite-nickel ore is additionally added, so that the production cost is increased by 13100 yuan compared with that of the example 1.
Comparative example 2 the difference between the comparative example 2 and the example 1 is that the mass of the semi coke accounts for 6.7 percent of the mass of the production raw materials, the rest is the same as that in the example 1, 43.75t of molten high nickel iron is obtained, wherein the mass percent of each element in the molten high nickel iron is C:2.94%, ni:7.58%, cr:4.45%, si:4.03%, P:0.025%, S:0.099%, the balance being Fe and unavoidable impurities.
According to the method, the steel sand washing is recycled in the submerged arc furnace, balls can be omitted, the steel sand washing directly enters the pre-reduction kiln through the rotary kiln batching station to be dried and then enters the submerged arc furnace to be directly used, no extra cost is generated, and the recycling cost is saved by 260 yuan for each ton of steel sand washing; the ore furnace recycles the steel washing sand, and the cost of the high-nickel molten iron is reduced by 271.95 yuan/t; the metal recovery rate of the steel grit is about 90 percent, and the yield of the high-nickel molten iron can be increased by 74.88t every day according to the condition that 100 tons of steel grit are used every day.
The above description is only exemplary of the invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the invention is intended to be covered by the appended claims.
Claims (10)
1. A method for recycling steel grit washing of an ore furnace is characterized by comprising the following steps:
(1) Drying the laterite-nickel ore in a drying kiln to obtain dried laterite-nickel ore;
(2) Mixing the washed steel grit and the dried laterite-nickel ore to obtain a production raw material, and adding the production raw material and semi coke into a rotary kiln to carry out roasting treatment to obtain roasted sand;
(3) And smelting the roasted sand in an ore smelting furnace to obtain the high-nickel molten iron.
2. The method for recycling steel-washing sand through the submerged arc furnace as claimed in claim 1, characterized in that in step (1), the mass percentage of the nickel-bearing laterite-nickel ore in the laterite-nickel ore is 45% -80%;
and/or the mass percent of each element in the high-nickel laterite-nickel ore is that Ni is more than or equal to 1.7%, TFe:14% -20% of SiO 2 /MgO≥1.6，Al 2 O 3 Less than or equal to 5 percent, and the balance of unavoidable moisture and impurities;
and/or the moisture content in the dried laterite-nickel ore is 18-24%.
3. The submerged arc furnace steel washing recycling method according to claim 1 or 2, characterized in that in step (2), the production raw materials comprise, in mass percent: 3 to 5 percent of steel grit washing and 95 to 97 percent of laterite-nickel ore after drying.
4. The method for recycling steel washing sand in submerged arc furnace according to claim 3, wherein the steel washing sand comprises the following elements in percentage by mass as TFe:70% -76%, cr:6% -9%, ni:1 to 1.3 percent, and the balance of waste residue and inevitable moisture;
and/or the granularity of the steel washing sand is 10-150 mu m.
5. The method for recycling steel grit washing of the submerged arc furnace according to any of the claims 1 to 4, characterized in that in the step (2), the semi coke accounts for 4 to 6.5 percent of the mass of the production raw materials.
6. The method for recycling steel washing sand in the submerged arc furnace as recited in any of claims 1-5, characterized in that in the step (2), the rotary kiln speed is 400-900r/min during the roasting treatment;
and/or the mass of the production raw materials and the semi-coke added into the rotary kiln is 30-80t/h;
and/or spraying bituminous coal from a pipeline of the rotary kiln by using compressed air, and controlling the coal spraying amount of the bituminous coal to be less than 8t/h.
7. The submerged arc furnace recycling method of steel washing sand according to any of the claims 1-6, characterized in that in step (2), the temperature of the roasting sand is 750-850 ℃.
8. The method for recycling steel grit in an ore smelting furnace according to any one of claims 1 to 7, wherein in the step (2), the position of the high temperature zone of the rotary kiln is changed by adjusting the opening and closing of a turning plate of an induced draft fan bellows of the rotary kiln in the roasting treatment.
9. The method for recycling steel grit washing by using the submerged arc furnace as recited in any one of claims 1 to 8, wherein in said smelting process, the electrode current of the submerged arc furnace is controlled to be 43000A to 50000A in step (3).
10. The submerged arc furnace recycling steel grit washing method according to any one of the claims 1 to 9, characterized in that in the step (3), the temperature of the molten high-nickel iron is 1500-1600 ℃;
and/or the mass percentages of the elements in the high-nickel iron water are C:1% -4%, ni:7% -12%, cr:0.5% -6%, si:0.3 to 4 percent of the total weight of the alloy, less than or equal to 0.05 percent of P, less than or equal to 0.35 percent of S, and the balance of Fe and inevitable impurities.
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| CN104451148A (en) * | 2014-12-01 | 2015-03-25 | 偏关县晋电化工有限责任公司 | Production technology for smelting ferronickel from laterite-nickel ore |
| JP2016211032A (en) * | 2015-05-07 | 2016-12-15 | 株式会社日向製錬所 | Method for producing ferronickel |
| CN106755963A (en) * | 2016-12-23 | 2017-05-31 | 宝钢德盛不锈钢有限公司 | A kind of method of dilval in high efficiente callback stainless steel sludge |
| CN107190139A (en) * | 2017-05-31 | 2017-09-22 | 江苏省冶金设计院有限公司 | A kind of method of Ni and Cr contained ferroalloy smelting |
| CN111286611A (en) * | 2020-03-27 | 2020-06-16 | 中南大学 | Method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104451148A (en) * | 2014-12-01 | 2015-03-25 | 偏关县晋电化工有限责任公司 | Production technology for smelting ferronickel from laterite-nickel ore |
| JP2016211032A (en) * | 2015-05-07 | 2016-12-15 | 株式会社日向製錬所 | Method for producing ferronickel |
| CN106755963A (en) * | 2016-12-23 | 2017-05-31 | 宝钢德盛不锈钢有限公司 | A kind of method of dilval in high efficiente callback stainless steel sludge |
| CN107190139A (en) * | 2017-05-31 | 2017-09-22 | 江苏省冶金设计院有限公司 | A kind of method of Ni and Cr contained ferroalloy smelting |
| CN111286611A (en) * | 2020-03-27 | 2020-06-16 | 中南大学 | Method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore |
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