CN111286611A - Method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore - Google Patents
Method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore Download PDFInfo
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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
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/10—Dry methods smelting of sulfides or formation of mattes by solid carbonaceous reducing agents
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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
- C22B1/11—Removing sulfur, phosphorus or arsenic other than by roasting
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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
- C22B23/00—Obtaining nickel or cobalt
- C22B23/02—Obtaining nickel or cobalt by dry processes
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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
- C22B34/00—Obtaining refractory metals
- C22B34/30—Obtaining chromium, molybdenum or tungsten
- C22B34/32—Obtaining chromium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C35/00—Master alloys for iron or steel
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- 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
Abstract
The invention discloses a method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore, which is characterized in that nickel sulfide ore, chromium-containing material and stainless steel smelting waste slag are added into laterite-nickel ore in a certain proportion, smelting is carried out by adopting a rotary kiln prereduction-electric furnace process, and the chromium-nickel-containing iron product is used for producing 300-series austenitic stainless steel. The nickel sulfide ore and the chromium-containing material can be respectively used as a part of nickel source and chromium source to improve the grade of nickel and chromium in alloy smelting products, other components in the nickel sulfide ore and the chromium-containing material are matched with other components in stainless steel smelting other waste residues, and the nickel sulfide ore and the chromium-containing material are used as slag formers to adjust the smelting performance of slag, improve the reduction condition of chromium oxide and strengthen the separation of metal and slag. The method can improve the chromium grade and the chromium recovery rate in the nickel-iron product, greatly reduce the smelting energy consumption, fully utilize various metallurgical waste residues generated in the stainless steel production process, realize the recovery of secondary resources, reduce the production cost of enterprises and eliminate the environmental pollution caused by the metallurgical waste residues.
Description
Technical Field
The invention discloses a method for smelting chromium-nickel-iron-containing iron and nickel from laterite-nickel ore, belonging to the technical field of ferrous metallurgy.
Background
Stainless steel is an important high-end material for national economy and national defense construction, and the stainless steel yield and consumption in China are continuously the first to live in the world for many years. Statistics show that the yield of the stainless steel in 2018 in China reaches over 2600 million tons, wherein the percentage of the 200-series stainless steel and the 300-series stainless steel which mainly comprise the nickel-based stainless steel is 80%.
The traditional nickel-based stainless steel production mainly takes electrolytic nickel prepared from nickel sulfide ore as a nickel source. With the increasing exhaustion of the global nickel sulfide ore resources, the demand of the ever-increasing nickel production can not be met. Compared with nickel sulfide ores, the laterite-nickel ore is richer in resources and is a main nickel raw material source for smelting stainless steel in a long period of time in the future. Smelting ferronickel from laterite-nickel ore, refining ferronickel, hot rolling, cold rolling and acid washing are the current principle process of producing nickel-based stainless steel. The method is characterized in that the laterite-nickel ore smelting ferronickel mainly adopts a rotary kiln-electric furnace process (RKEF), accounts for more than 90% of the total ferronickel yield, and the product is usually used for 300 series stainless steel production.
Influenced by the natural endowment difference of the laterite-nickel ore raw material, the problems of low metal recovery rate, environmental pollution and the like exist in the production of the ferronickel, particularly, the recovery difference (about 10 percent) of chromium metal not only causes resource waste, but also has low chromium content in the ferronickel, and a large amount of ferrochrome raw material needs to be added during refining; in addition, in the ferronickel smelting process, high-melting-point chromium oxide enters molten slag to deteriorate smelting performance, so that slag and iron are difficult to separate, and the metal recovery rate is reduced; on the other hand, because the slag discharge amount is large (the slag discharge amount in ferronickel smelting is more than 10 times of that in pig iron smelting), the comprehensive utilization is low (about 10 percent), and a large amount of chromium-containing ferronickel slag is in a stockpiling state, the potential environmental pollution hidden trouble is brought.
In the whole process of stainless steel production, various solid wastes are also generated. Such as desulfurized gypsum generated after flue gas desulfurization, dust and steel slag generated in the production process of stainless steel, sludge generated in the pickling process and the like. Generally, the production amount of stainless steel dust containing chromium and nickel is about 4% of the stainless steel yield, and the production amount of acid sludge is about 3% -5% of the stainless steel yield. The acid-washing sludge contains harmful elements such as fluorine (F: 3-7%), sulfur (S: 8-10%), chromium (Cr: 2-4%), and the like, belongs to industrial solid hazardous waste, and has serious environmental pollution, and the existence of the solid waste influences the long-term healthy development of stainless steel enterprises.
Disclosure of Invention
The invention provides a method for smelting chromium-nickel-iron-containing metallurgical waste residues such as stainless steel dust, acid pickling sludge, desulfurized gypsum, steel slag and the like in a full process aiming at the problems of low chromium recovery rate in the smelting of nickel iron and stainless steel, and the method is characterized in that the metallurgical waste residues are recycled in a rotary kiln-electric furnace process, and simultaneously the components in the waste residues are utilized to optimize and regulate the performance of the furnace slag so as to realize the high-efficiency recovery of metal chromium and directly prepare the nickel-chromium-iron crude alloy.
The technical scheme of the invention is as follows:
the invention relates to a method for smelting chromium-nickel-iron-containing nickel ore, which comprises the steps of mixing the nickel ore with a mixed additive and a reducing agent to obtain a mixture, pre-reducing the mixture to obtain pre-reduced calcine, smelting the pre-reduced calcine, and separating slag and iron after smelting to obtain chromium-nickel-iron-containing iron; the mixed additive comprises nickel sulfide ore, chromium-containing material and stainless steel smelting other waste residues; in the mixture, the content of sulfur is 0.75-4%; the content of fluoride is 1-3%; the calcium oxide content is 3-8%, the aluminum oxide content is 3-6%, and the mass ratio of the magnesium oxide to the silicon oxide is 0.5-0.7.
The method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore comprises the following steps of 1-3% of sulfur in a mixture; the content of fluoride is 1.3-2.0%; the calcium oxide content is 5-8%, the aluminum oxide content is 5-6%, and the mass ratio of the magnesium oxide to the silicon oxide is 0.6-0.65.
The method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore comprises the following step of adding nickel sulfide ore in an amount which is 2-5% of the mass of the laterite-nickel ore.
The method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore comprises the following step of adding chromium-containing materials in an amount which is 2-6% of the mass of the laterite-nickel ore.
Preferably, the chromium-containing material comprises at least one of chromite, acid-washing sludge in stainless steel smelting waste slag and stainless steel dust in stainless steel smelting waste slag.
The method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore comprises the step of adding stainless steel smelting waste residues in an amount which is 5-10% of the mass of the laterite-nickel ore.
Preferably, the stainless steel smelting other waste slag is at least one selected from desulfurized gypsum and steel slag.
In the invention, the sulfur content in the mixture is adjusted by the acid-washing sludge and the desulfurized gypsum in the nickel sulfide ore and the stainless steel smelting waste residue.
The content of calcium oxide in the mixture is adjusted by acid-washing sludge, steel slag and desulfurized gypsum in the stainless steel smelting waste residue.
In addition, the acid-washing sludge in the stainless steel smelting waste slag contains a certain amount of fluoride, which is beneficial to improving the fluidity of the slag.
The method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore comprises the step of smelting chromium-nickel-containing iron and nickel in a mixture, wherein the content of alumina is 3-6%.
The method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore comprises the following step of 1-3% of fluoride in a mixture.
The method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore comprises the following steps of 1.5-2.5% of nickel in a mixture and 2-5% of chromium.
In the invention, the reducing agent is the conventional reducing agent in the laterite-nickel ore smelting in the prior art, such as coal powder, coke, semi coke and the like.
The method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore has the prereduction temperature of 800-.
The method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore is characterized in that the smelting temperature is 1550-1580 ℃.
The invention relates to a method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore, wherein the content of FeO in slag obtained by slag-iron separation is 7-13%.
The method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore comprises the following steps that the total metal content in the chromium-nickel-containing iron and nickel product is not less than 96%, the chromium grade is 2-8%, and the chromium recovery rate is not less than 40%.
The invention relates to a method for smelting chromium-nickel-iron-containing products from laterite-nickel ore, wherein the silicon content of the chromium-nickel-iron-containing products is less than 3%.
The main principle and the benefits of the invention are as follows:
in the process of smelting in a rotary kiln-electric furnace, because the difference of reduction thermodynamics and kinetics conditions of chromium oxide, nickel and iron oxide is large, the reduction temperature in the kiln is about 800 ℃ in the pre-reduction stage of the rotary kiln, nickel and iron oxide in the laterite-nickel ore mixed material can be reduced into metallic nickel and metallic iron, but the existing chromium oxide cannot be reduced, and the minimum temperature of the chromium reduced into the metallic chromium is over 1200 ℃; in the process of pre-reduction of the rotary kiln, the chromium oxide in the mixture and oxides of iron, magnesium, aluminum and the like in the raw materials are subjected to combined reaction to form a chromium-containing spinel phase with higher melting point and more stable phase. In the subsequent electric furnace smelting process, the spinel containing chromium can not be reduced into a metallic state; on the other hand, the incorporation of unreduced solid chromium-containing spinel into slag leads to deterioration of properties such as viscosity and fluidity, and the reduction of metal recovery.
According to the invention, by adding the mixed additive, the additive is combined with iron, magnesium and aluminum in the laterite-nickel ore under the action of effective components such as calcium, sulfur and silicon in the mixed additive in the pre-reduction stage of a rotary kiln and the initial stage of electric furnace smelting, so that the reaction of chromium oxide in the laterite-nickel ore with iron, magnesium and aluminum minerals is inhibited, the generation of a high-melting-point and stable chromium-containing spinel phase is limited, the reduction condition of chromium oxide in the electric furnace smelting process is improved, and the reduction of chromium oxide into metal chromium is strengthened and the metal chromium enters molten iron. Meanwhile, calcium, sulfur and silicon in the mixed additive can also generate a multi-component low-melting-point phase after reacting with iron, magnesium and aluminum minerals in the materials, and the high-melting-point solid phase in the slag is obviously reduced due to the reduction and enhancement of chromium oxide, so that the viscosity and the fluidity of the slag in the smelting process are improved and the metal recovery rate is improved. In addition, through the effect of the mixed additive, the melting of the materials can be accelerated, the production efficiency is improved, and the beneficial effect of reducing the smelting power consumption can be brought on the premise of not reducing the smelting temperature and improving the recovery rate of the metal chromium.
In the invention, the preferable mixed additives are nickel sulfide ore, chromium-containing material and stainless steel smelting waste slag which are used as mixed additives, and the mixed additives are not only used as calcium source, sulfur source or silicon source, and control the calcium, sulfur and silicon in the mixed material to be in the required range, but also can improve the nickel and chromium content in the mixed material and optimize the smelting furnace slag components, and on the other hand, realizes the reutilization of solid waste.
In the production process of ferronickel and stainless steel, a large amount of harmful/dangerous solid wastes such as pickling sludge, stainless steel dust, desulfurized gypsum and the like are generated. Wherein, the pickling sludge and the stainless steel dust contain certain valuable metals of chromium, nickel and iron, and have recycling value. The acid-washing sludge also contains elements such as sulfur, fluorine and the like, and the desulfurized gypsum mainly contains elements such as calcium, sulfur and the like. The invention fully utilizes a plurality of components in the smelting waste and combines with primary minerals such as nickel sulfide ore, chromite and the like, so that calcium, sulfur, silicon and the like in the smelting waste are combined with iron, magnesium, aluminum and the like in the mixture, thereby inhibiting the reaction of chromium oxide and the iron, magnesium and aluminum minerals, limiting the generation of a high-melting-point and stable chromium-containing spinel phase, improving the reduction condition of the chromium oxide, and strengthening the reduction of the chromium oxide into metal chromium and entering molten nickel iron.
In addition, sulfur-containing components in the nickel sulfide ore, the acid pickling sludge and the desulfurized gypsum generate ferrous sulfide with iron oxide in the high-temperature reduction process, and the ferrous sulfide and the iron sulfide are further combined with metallic iron to obtain a low-melting-point ferrous sulfide-iron solid solution; calcium-containing components in the desulfurized gypsum and the acid-washed sludge can react with magnesium-silicon components and silicon-aluminum components in the mixture to obtain low-melting-point diopside; the calcium fluoride component of the acid wash sludge also contributes to improved slag fluidity. Therefore, under the condition of proper addition of the materials, the melting speed of the materials is accelerated in the smelting process, the production efficiency is improved, the viscosity of molten slag is reduced, the fluidity is improved, the metal recovery rate is improved, and the smelting power consumption is reduced.
In addition, the invention can obviously reduce the chromium content in the smelting slag, and eliminate the environmental pollution caused by the stockpiling of smelting wastes such as chromium-containing smelting slag, stainless steel pickling sludge, stainless steel dust, desulfurized gypsum and the like in ferronickel and stainless steel production enterprises. The invention is applicable to both nickel iron or stainless steel enterprises which adopt RKEF to produce, can improve the resource utilization rate and reduce the production cost of stainless steel of the enterprises. The method realizes the recycling of various smelting wastes such as stainless steel pickling sludge, stainless steel dust and the like in the RKEF process and the efficient recycling of chromium in the electric furnace smelting process, directly prepares the nickel-chromium-iron alloy, and has important significance for solving the resource and environmental problems in the stainless steel production.
Detailed Description
Comparative example 1:
according to the general process flow of smelting ferronickel in a rotary kiln-electric furnace, laterite-nickel ore is dried in a drying kiln, and then added with semi coke with 6 percent of the mass of the laterite-nickel ore as a reducing agent without adding a mixed additive; pre-reducing at 800 ℃ in a rotary kiln, hot charging the calcine into an electric furnace, smelting at 1600 ℃, obtaining a ferronickel product with total metal content of 96 percent, wherein the metal chromium content is 0.9 percent, the recovery rate is 12.3 percent, and the electric furnace smelting per ton of ferronickel consumes 4000 Kw.h.
Comparative example 2:
adding chromite accounting for 3 percent of the mass of the laterite-nickel ore into the laterite-nickel ore, and adding semi-coke accounting for 6 percent of the mass of the laterite-nickel ore into the laterite-nickel ore as a reducing agent after drying; the mixed material enters a rotary kiln for prereduction, the prereduction temperature is about 800 ℃, the prereduction calcine is hot-charged and enters an electric furnace, the smelting temperature is 1600 ℃, the total metal content in the obtained ferronickel product is 96 percent, wherein the metal chromium content is 1.1 percent, the recovery rate is 13 percent, and the power consumption of the electric furnace for smelting one ton of ferronickel is 4100 Kw.h.
Comparative example 3:
adding nickel sulfide ore accounting for 3 percent of the mass of the laterite-nickel ore, wherein the adding amount of chromite and stainless steel acid pickling sludge accounts for 3 percent of the mass of the laterite-nickel ore, and the adding amount of desulfurization gypsum accounts for 5 percent of the mass of the laterite-nickel ore; after the materials are mixed, the sulfur content in the mixed material is 1 percent, the calcium oxide content is 4 percent, the aluminum oxide content is 5 percent, the mass ratio of magnesium oxide to silicon oxide is 0.63, the fluoride content is 1.3 percent, and the FeO content in the slag is 11 percent. Mixing and drying the materials, and adding semi-coke which accounts for 6 percent of the mass of the laterite-nickel ore as a reducing agent; pre-reducing the mixture in a rotary kiln at 800 ℃, hot charging the calcine into an electric furnace, and smelting at 1520 ℃, wherein the total metal content in the obtained chromium-nickel-iron-containing product is 93.5 percent, the metal chromium content is 1.4 percent, the recovery rate is 18 percent, and the power consumption of the electric furnace smelting ton of ferronickel is 3800 Kw.h.
Example 1:
adding nickel sulfide ore accounting for 3 percent of the mass of the laterite-nickel ore, wherein the adding amount of chromite and stainless steel acid pickling sludge accounts for 3 percent of the mass of the laterite-nickel ore, and the adding amount of desulfurization gypsum accounts for 5 percent of the mass of the laterite-nickel ore; after the materials are mixed, the sulfur content in the mixed material is 1 percent, the calcium oxide content is 4 percent, the aluminum oxide content is 5 percent, the mass ratio of magnesium oxide to silicon oxide is 0.63, the fluoride content is 1.3 percent, and the FeO content in the slag is 11 percent. Mixing and drying the materials, and adding semi-coke which accounts for 6 percent of the mass of the laterite-nickel ore as a reducing agent; pre-reducing at 800 ℃ in a rotary kiln, hot charging the calcine into an electric furnace, smelting at 1575 ℃, obtaining a product containing chromium-nickel iron with the total metal content of 96.2 percent, wherein the metal chromium content is 3.4 percent, the recovery rate is 43 percent, the silicon content in the product is 2.3 percent, and the power consumption of electric furnace smelting of each ton of nickel iron is 3260 Kw.h. Compared with comparative examples 1-3, the chromium grade and the recovery rate are greatly improved in the embodiment, and the electric furnace smelting power consumption is greatly reduced. Compared with the comparative example 3, the total metal content of the product obtained in the embodiment is obviously improved, and the impurity content is obviously reduced.
Example 2:
adding nickel sulfide ore accounting for 5 percent of the mass of the laterite-nickel ore, wherein the adding amount of chromite ore, stainless steel acid cleaning sludge and stainless steel dust accounts for 5 percent of the mass of the laterite-nickel ore, and the adding amount of desulfurized gypsum and steel slag accounts for 6 percent of the mass of the laterite-nickel ore; after the materials are mixed, the sulfur content in the mixed material is 2%, the calcium oxide content is 5%, the aluminum oxide content is 6%, the mass ratio of magnesium oxide to silicon oxide is 0.64, the fluoride content is 1.5%, and the FeO content in the slag is 8%. According to the general process flow of smelting ferronickel in a rotary kiln-electric furnace, mixing and drying the materials, and adding semi-coke accounting for 6 percent of the mass of the laterite-nickel ore as a reducing agent; pre-reducing at 800 ℃ in a rotary kiln, hot charging the calcine into an electric furnace, smelting at 1570 ℃, wherein the total metal content in the obtained chromium-nickel-iron-containing product is 96.5 percent, the metal chromium content is 4.1 percent, the recovery rate is 46 percent, the silicon content in the product is 2.2 percent, and the power consumption of the electric furnace for smelting each ton of nickel iron is 3200 Kw.h. Compared with a comparative example, the chromium grade and the recovery rate are both greatly improved, and the electric furnace smelting power consumption is greatly reduced.
Example 3:
adding nickel sulfide ore accounting for 5 percent of the mass of the laterite-nickel ore, wherein the adding amount of chromite ore, stainless steel acid pickling sludge and stainless steel dust accounts for 6 percent of the mass of the laterite-nickel ore, and the adding amount of desulfurized gypsum and steel slag accounts for 8 percent of the mass of the laterite-nickel ore; after the materials are mixed, the sulfur content in the mixed material is 2.5 percent, the calcium oxide content is 6 percent, the aluminum oxide content is 6 percent, the mass ratio of magnesium oxide to silicon oxide is 0.64, the fluoride content is 1.7 percent, and the FeO content in the slag is 13 percent. Drying the mixed material in a drying kiln, and adding semi-coke which accounts for 6% of the mass of the laterite-nickel ore as a reducing agent; the mixed material enters a rotary kiln for prereduction at 800 ℃, the calcine is hot-charged into an electric furnace, the smelting temperature is 1580 ℃, the total metal content in the obtained chromium-nickel-iron-containing product is 97 percent, wherein the metal chromium content is 5.8 percent, the recovery rate is 53 percent, the silicon content in the product is 2.1 percent, and the power consumption of the electric furnace for smelting each ton of nickel iron is 3300 Kw.h. Compared with a comparative example, the chromium grade and the recovery rate are both greatly improved, and the electric furnace smelting power consumption is greatly reduced.
Claims (9)
1. A method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore is characterized by comprising the following steps: mixing laterite-nickel ore with a mixed additive and a reducing agent to obtain a mixture, prereducing the mixture to obtain prereduced calcine, smelting the prereduced calcine, and separating slag and iron after smelting to obtain chromium-nickel-containing iron; the mixed additive comprises nickel sulfide ore, chromium-containing material and stainless steel smelting other waste residues; in the mixture, the content of sulfur is 0.75-4%; the content of fluoride is 1-3%; the calcium oxide content is 3-8%, the aluminum oxide content is 3-6%, and the mass ratio of the magnesium oxide to the silicon oxide is 0.5-0.7.
2. The method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore according to claim 1, characterized by comprising the following steps:
in the mixture, the content of sulfur is 1-3%; the content of fluoride is 1.3-2.0%; the calcium oxide content is 5-8%, the aluminum oxide content is 5-6%, and the mass ratio of the magnesium oxide to the silicon oxide is 0.6-0.65.
3. The method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore according to claim 1, characterized by comprising the following steps:
the adding amount of the nickel sulfide ore is 2-5% of the mass of the laterite-nickel ore.
4. The method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore according to claim 1, characterized by comprising the following steps: the addition amount of the chromium-containing material is 2-6% of the mass of the laterite-nickel ore, and the chromium-containing material is selected from at least one of chromite, acid-washing sludge in stainless steel smelting waste residues and stainless steel dust in the stainless steel smelting waste residues.
5. The method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore according to claim 1, characterized by comprising the following steps: the addition amount of the other stainless steel smelting waste residues is 5-10% of the mass of the laterite-nickel ore, and the other stainless steel smelting waste residues are at least one of desulfurized gypsum and steel slag.
6. The method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore according to claim 1, characterized by comprising the following steps: in the mixture, the content of nickel is 1.5-2.5%, and the content of chromium is 2-5%.
7. The method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore according to claim 1, characterized by comprising the following steps: the temperature of the pre-reduction is 800-900 ℃; the smelting temperature is 1550-1580 ℃.
8. The method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore according to claim 1, characterized by comprising the following steps: the content of FeO in the slag obtained by slag-iron separation is 7-13%.
9. The method for smelting chromium-nickel-containing iron and nickel from laterite-nickel ore according to claim 1, characterized by comprising the following steps: the total metal content in the chromium-nickel-iron-containing product is more than or equal to 96 percent, the silicon content is less than 3 percent, the chromium grade is 2-8 percent, and the chromium recovery rate is more than or equal to 40 percent.
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| CN114182155A (en) * | 2021-11-24 | 2022-03-15 | 中冶南方工程技术有限公司 | Method for preparing ferronickel by reinforcing laterite-nickel ore with waste gypsum |
| CN115772590A (en) * | 2022-11-30 | 2023-03-10 | 广西北港新材料有限公司 | Method for recycling steel washing sand in submerged arc furnace |
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| CN104946832A (en) * | 2015-06-29 | 2015-09-30 | 中冶京诚工程技术有限公司 | Method for producing nickel-contained molten iron by using laterite nickel ore |
| CN108220623A (en) * | 2017-12-21 | 2018-06-29 | 中南大学 | A kind of method for reducing RKEF technique ferronickel energy consumptions |
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| CN114182155A (en) * | 2021-11-24 | 2022-03-15 | 中冶南方工程技术有限公司 | Method for preparing ferronickel by reinforcing laterite-nickel ore with waste gypsum |
| CN115772590A (en) * | 2022-11-30 | 2023-03-10 | 广西北港新材料有限公司 | Method for recycling steel washing sand in submerged arc furnace |
| CN115772590B (en) * | 2022-11-30 | 2024-03-08 | 广西北港新材料有限公司 | Method for recycling steel washing sand in submerged arc furnace |
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