阅读说明：本技术 一种用于电渣重熔的炉渣和一种利用电渣重熔回收废金属碎料的方法 (Slag for electroslag remelting and method for recycling waste metal crushed aggregates by using electroslag remelting ) 是由 王强 李光强 卢汝 陈雨飞 刘昱 周光富 于 2021-08-06 设计创作，主要内容包括：本发明提供了一种用于电渣重熔的炉渣和一种利用电渣重熔回收废金属碎料的方法,属于金属精炼和电渣重熔技术领域。本发明用于电渣重熔的炉渣,以质量百分含量计,包括CaF-(2)45～60％、Al-(2)O-(3)15～23％、CaO15～25％和Na-(2)O5～12％,所述Na-(2)O以Na-(2)CO-(3)的形式使用。渣中的Na-(2)O具有高碱度、高流动性和低熔点等优点,同时能够起到脱硫剂和脱氧剂的作用,能够提高现有高氟渣的脱硫能力和降低高氟渣的熔点,并减弱高挥发性金属的挥发。由于电渣重熔过程中熔渣温度高,一般可达1700～1800℃,因而对废金属碎料的脱硫以及去除挥发性杂质等具有良好的精炼效果。(The invention provides slag for electroslag remelting and a method for recovering waste metal crushed aggregates by utilizing the electroslag remelting, belonging to the technical field of metal refining and electroslag remelting. The slag for electroslag remelting comprises CaF (calcium fluoride) in percentage by mass 2 45～60％、Al 2 O 3 15-23%, CaO 15-25% and Na 2 O5-12%, the content of Na 2 O is Na 2 CO 3 Is used in the form of (1). Na in the slag 2 O has the advantages of high alkalinity, high fluidity, low melting point and the like, can play the role of a desulfurizer and a deoxidizer, can improve the desulfurization capability of the existing high-fluorine slag, reduce the melting point of the high-fluorine slag and weaken the volatilization of high-volatility metal. Because the temperature of the molten slag in the electroslag remelting process is high and can generally reach 1700-1800 ℃, the method has good refining effects on the desulfurization of waste metal crushed aggregates, the removal of volatile impurities and the like.)

1. The slag for electroslag remelting is characterized by comprising CaF (calcium fluoride) in percentage by mass₂ 45～60％、Al₂O₃15-23%, CaO 15-25% and Na₂O5-12%, Na₂O is Na₂CO₃Is used in the form of (1).

2. A method for recycling waste metal crushed aggregates by electroslag remelting adopts an electroslag remelting device matched with a water-cooled electrode for remelting and refining, and is characterized by comprising the following steps:

premelting the slag of claim 1 to obtain liquid premelting slag;

connecting the water-cooled electrode with a cooling water pipe, and connecting cooling water; pouring the liquid premelting slag into a water-cooled crystallizer, connecting the upper end of a water-cooled electrode with an electric clamp, and inserting the lower end of the water-cooled electrode into the liquid premelting slag in the water-cooled crystallizer; and switching on a power supply to form a complete current loop, adding the waste metal crushed aggregates into a water-cooled crystallizer after the current is stable, adding a deoxidizer in the feeding process, and remelting and refining.

3. The method of claim 2, wherein the temperature of the premelt is 1450 to 1600 ℃.

4. The method according to claim 2 or 3, characterized in that during the pre-melting, after the slag is completely melted, the temperature is kept for 4-7 min.

5. The method according to claim 2, wherein the mass of the slag is 40-70% of the mass of the crushed metal.

6. The method according to claim 2, wherein the deoxidizer comprises a magnesium calcium alloy, and the magnesium calcium alloy comprises, by mass percent, 20-35% of Ca and 65-80% of Mg.

7. The method according to claim 2, characterized in that the deoxidant is added in portions to a water-cooled crystallizer.

8. The method as claimed in claim 2, wherein the feeding speed of the scrap metal pieces is 85-130 kg/h.

9. The method according to claim 2, wherein the water-cooled electrode is inserted into the liquid pre-melted slag to a depth of 15-30 mm.

10. The method according to claim 2, wherein the inner diameter of the water-cooled crystallizer is 300-1000 mm; when the inner diameter of the water-cooled crystallizer is smaller than 400mm, the current is 5000-7000A; when the inner diameter of the water-cooled crystallizer is 400-600 mm, the current is 8000-10000A; when the inner diameter of the water-cooled crystallizer is larger than 600mm and smaller than 800mm, the current is 11000-12000A; when the inner diameter of the water-cooled crystallizer is 800-1000 mm, the current is 13000-14000A.

Technical Field

The invention relates to the technical field of metal refining and electroslag remelting, in particular to slag for electroslag remelting and a method for recycling waste metal crushed aggregates by utilizing electroslag remelting.

Background

At present, the electrolytic method is widely applied to the large-scale industrial production of high-purity metals, such as manganese, nickel, copper, aluminum and the like. When high-purity metal is produced by electrolysis, metal ore is subjected to electrolysis after being crushed, neutralized, leached and purified, a cathode plate attached with deposited metal is taken out after the electrolysis is finished, and after the qualified high-purity metal is stripped, electrolytic metal with excessive impurity content such as sulfur, phosphorus and the like can be remained on the cathode plate, which is called electrolytic metal crushed aggregates, and generally the waste is mainly granular. In addition to off-grade electrolytic metals having high impurity levels, the regeneration of some of the costly recycled scrap metal scrap, such as titanium, rare earth alloys, etc., also requires suitable refining and purification means. In order to reduce the impurity content in the waste metal crushed aggregates, the existing method is to adopt an induction furnace to carry out remelting refining on the waste metal crushed aggregates, but in the induction furnace, the slag temperature is lower than the metal liquid temperature, so that the slag fluidity and the reaction capability are poor, and the refining effect is poor. In addition, the liquid slag formed by impurities in the waste metal crushed aggregates has a strong corrosion effect on the furnace lining of the induction furnace, the furnace lining material has to be replaced frequently, the operation efficiency is low, and the production cost is increased.

Chinese patent CN 108251654A discloses an electroslag remelting device and method for refining waste metal particles, wherein the waste metal particles are refined by adopting a water-cooled copper electrode electroslag remelting method, compared with induction furnace refining, the refining effect is improved, the refining process is carried out in a copper crystallizer, the erosion of a furnace lining and the recarburization of a remelted metal ingot cannot be caused, but the method adopts high-fluorine slag, the main component of which is CaF₂CaO and Al₂O₃And insufficient desulfurization and deoxidation capabilities.

Disclosure of Invention

The invention aims to provide slag for electroslag remelting and a method for recovering waste metal fragments by utilizing electroslag remelting.

In order to achieve the above object, the present invention provides the following technical solutions:

the invention provides slag for electroslag remelting, which comprises CaF (calcium fluoride) in percentage by mass₂45～60％、Al₂O₃15-23%, CaO 15-25% and Na₂O5-12%, Na₂O is Na₂CO₃Is used in the form of (1).

The invention provides a method for recycling waste metal crushed aggregates by electroslag remelting, which adopts an electroslag remelting device matched with a water-cooled electrode to carry out remelting and refining and comprises the following steps:

premelting the slag of claim 1 to obtain liquid premelting slag;

connecting the water-cooled electrode with a cooling water pipe, and connecting cooling water; pouring the liquid premelting slag into a water-cooled crystallizer, connecting the upper end of a water-cooled electrode with an electric clamp, and inserting the lower end of the water-cooled electrode into the liquid premelting slag in the water-cooled crystallizer; and switching on a power supply to form a complete current loop, adding the waste metal crushed aggregates into a water-cooled crystallizer after the current is stable, adding a deoxidizer in the feeding process, and remelting and refining.

Preferably, the temperature of the premelting is 1450-1600 ℃.

Preferably, during the pre-melting, after the furnace slag is completely melted, the temperature is kept for 4-7 min.

Preferably, the mass of the slag is 40-70% of the mass of the crushed metal.

Preferably, the deoxidizer comprises a magnesium-calcium alloy, and the magnesium-calcium alloy comprises, by mass, 20-35% of Ca and 65-80% of Mg.

Preferably, the deoxidizer is added into the water-cooled crystallizer in batches.

Preferably, the feeding speed of the waste metal crushed aggregates is 85-130 kg/h.

Preferably, the depth of the water-cooled electrode inserted into the liquid premelting slag is 15-30 mm.

Preferably, the inner diameter of the water-cooled crystallizer is 300-1000 mm; when the inner diameter of the water-cooled crystallizer is smaller than 400mm, the current is 5000-7000A; when the inner diameter of the water-cooled crystallizer is 400-600 mm, the current is 8000-10000A; when the inner diameter of the water-cooled crystallizer is larger than 600mm and smaller than 800mm, the current is 11000-12000A; when the inner diameter of the water-cooled crystallizer is 800-1000 mm, the current is 13000-14000A.

The invention provides slag for electroslag remelting, which comprises CaF (calcium fluoride) in percentage by mass₂45～60％、Al₂O₃15-23%, CaO 15-25% and Na₂O5-12%, Na₂O is Na₂CO₃Is used in the form of (1). Na in the slag₂O has the advantages of high alkalinity, high fluidity, low melting point and the like, can simultaneously play the role of a desulfurizer and a deoxidizer, can improve the desulfurization capability of the existing high-fluorine slag, reduce the melting point of the high-fluorine slag and weaken the volatilization of high-volatility metal, and adopts Na₂O replacing part of CaF₂Can attenuate CaF₂And the environment pollution caused by volatilization. Because the temperature of the molten slag in the electroslag remelting process is high and can generally reach 1700-1800 ℃, the method has good refining effects on the desulfurization of waste metal crushed aggregates, the removal of volatile impurities and the like.

Furthermore, the magnesium-calcium alloy is used as a deoxidizer, the Mg, Ca and O, S have strong affinity, and the magnesium-calcium alloy can reduce volatilization of a single metal when used as the deoxidizer, thereby being beneficial to desulfurization and deoxidation.

Drawings

FIG. 1 is a schematic structural diagram of an electroslag remelting device used in the invention, wherein the electroslag remelting device comprises a water-cooled electrode 1, a vibrating feeder 2, a water-cooled crystallizer 3, liquid premelting slag 4, a cooling water outlet pipeline 5, a bottom water tank 6, a cable 7, a power supply control cabinet 8, a cooling water inlet pipeline 9, a stand column 10 and a lifting cross arm 11.

Detailed Description

The invention provides slag for electroslag remelting, which comprises CaF (calcium fluoride) in percentage by mass₂45～60％、Al₂O₃15-23%, CaO 15-25% and Na₂O5-12%, Na₂O is Na₂CO₃Is used in the form of (1).

The slag for electroslag remelting provided by the invention comprises CaF (calcium fluoride) in percentage by mass₂45-60%, preferably 50-55%, more preferably 52-53%.

The slag for electroslag remelting provided by the invention comprises Al₂O₃15 to 23%, preferably 17 to 21%, more preferably 18 to 20%.

The slag for electroslag remelting provided by the invention comprises 15-25% of CaO, preferably 18-23%, and more preferably 19-21%.

The slag for electroslag remelting provided by the invention comprises Na₂O5-12%, preferably 7-10%, more preferably 8-9%. In the present invention, the Na is₂O is Na₂CO₃Is used in the form of (1), and m_(Na2CO3)＝106·m_(Na2O)M () represents the mass of a certain component.

Na₂O has the advantages of high alkalinity, high fluidity, low melting point and the like, can simultaneously play the role of a desulfurizer and a deoxidizer, can improve the desulfurization capability of the existing high-fluorine slag, reduce the melting point of the high-fluorine slag and weaken the volatilization of high-volatility metal, and adopts Na₂O replacing part of CaF₂Can attenuate CaF₂And the environment pollution caused by volatilization.

The invention provides a method for recycling waste metal crushed aggregates by electroslag remelting, which adopts an electroslag remelting device matched with a water-cooled electrode to carry out remelting and refining and comprises the following steps:

pre-melting the furnace slag to obtain liquid pre-melted slag;

connecting the water-cooled electrode with a cooling water pipe, and connecting cooling water; pouring the liquid premelting slag into a water-cooled crystallizer, connecting the upper end of a water-cooled electrode with an electric clamp, and inserting the lower end of the water-cooled electrode into the liquid premelting slag in the water-cooled crystallizer; and switching on a power supply to form a complete current loop, adding the waste metal crushed aggregates into the water-cooled crystallizer after the current is stable, adding a deoxidizer in the feeding process, and remelting and refining.

In the present invention, the electroslag remelting device is preferably an electroslag remelting device disclosed in CN 108251654 a, and the specific structure is shown in fig. 1, in which: 1-water-cooled electrode, 2-vibration feeder, 3-water-cooled crystallizer, 4-liquid premelting slag, 5-cooling water outlet pipeline, 6-bottom water tank, 7-cable, 8-power control cabinet, 9-cooling water inlet pipeline, 10-upright post and 11-lifting cross arm. The electroslag remelting device comprises a water-cooled crystallizer, an electrode, a bottom water tank, a power supply control cabinet and a cable; the water-cooled crystallizer is placed on the bottom water tank, a vibration feeder for adding waste metal particles is arranged at the top of the water-cooled crystallizer, the electrode is a water-cooled electrode, the water-cooled electrode is arranged on a lifting cross arm, and one end of the lifting cross arm is connected with the stand column and can lift along the stand column; the water-cooling electrode pair is inserted into the water-cooling crystallizer; the lifting cross arm and the bottom water tank are respectively connected with the power supply control cabinet through cables; the water-cooling electrode is a tube-in-tube structure made of a purple copper material and comprises an inner tube and an outer tube, the bottom ends of the inner tube and the outer tube are communicated, and a cooling water inlet pipeline communicated with the inner tube and a cooling water outlet pipeline communicated with the outer tube are arranged at the top of the water-cooling electrode. The invention has no special requirement on the size of the water-cooled electrode, and in the embodiment of the invention, the outer diameter of the water-cooled electrode is 180mm, the wall thickness of an outer pipe is 10mm, and the wall thickness of an inner pipe is 3 mm; or the outer diameter of the water-cooled electrode is 240mm, the wall thickness of the outer pipe is 15mm, and the wall thickness of the inner pipe is 3 mm.

The method carries out premelting on the slag to obtain the liquid premelting slag.

Before the pre-melting, CaO and Al in the slag are preferably added₂O₃Respectively and continuously drying for 8-12 hours at 900-1100 ℃, and then respectively drying by CaF₂Continuously drying for 4-6 hours at 300-500 ℃ and adding Na₂CO₃Continuously drying for 3-5 hours at 270-350 ℃. The invention can thoroughly remove the water in the slag by drying in advance, and avoids oxygenation and hydrogen increase in the remelting refining process.

In the invention, the pre-melting temperature is preferably 1450-1600 ℃, and more preferably 1500-1550 ℃. According to the invention, preferably, after the furnace slag is completely melted, the temperature is kept for 4-7 min. The invention promotes the homogenization of slag components through heat preservation. In the pre-melting process, Na₂CO₃Decomposition to Na₂O and CO₂。

In the present invention, the amount of the slag is preferably determined according to the mass of the scrap metal pieces; the mass of the slag is preferably 40-70%, more preferably 45-65%, and even more preferably 50-60% of the mass of the crushed metal.

After the liquid pre-melted slag is obtained, the water-cooling electrode is well connected with the cooling water pipe, and cooling water is connected; pouring the liquid premelting slag into a water-cooled crystallizer, connecting the upper end of a water-cooled electrode with an electric clamp, and inserting the lower end of the water-cooled electrode into the liquid premelting slag in the water-cooled crystallizer; and switching on the power supply to form a complete current loop.

In the invention, the depth of the water-cooled electrode inserted into the liquid pre-melted slag is preferably 15-30 mm, more preferably 20-25 mm, and further preferably 22-24 mm. The flow rate of the cooling water is not particularly required in the invention, and the flow rate well known in the field can be adopted.

In the invention, the inner diameter of the water-cooled crystallizer is preferably 300-1000 mm; when the inner diameter of the water-cooled crystallizer is less than 400mm, the current is preferably 5000-7000A, more preferably 5500-6500A, and further preferably 5800-6200A; when the inner diameter of the water-cooled crystallizer is 400-600 mm, the current is preferably 8000-10000A, more preferably 8500-9500A, and further preferably 8800-9200A; when the inner diameter of the water-cooled crystallizer is larger than 600mm and smaller than 800mm, the current is preferably 11000-12000A, more preferably 11200-11800A, and further preferably 11400-11600A; when the inner diameter of the water-cooled crystallizer is 800-1000 mm, the current is preferably 13000-14000A, more preferably 13200-13800A, and even more preferably 13400-13600A. Aiming at different inner diameters of the water-cooled crystallizers, different current values are selected, so that the phenomenon of serious oxidization due to overhigh temperature caused by overlarge current can be prevented, and energy waste can be avoided.

After the current is stable, the scrap metal particles are added into a water-cooled crystallizer, and a deoxidizer is added in the feeding process to carry out remelting refining.

In the present invention, the scrap metal pieces are preferably pellets. The present invention does not require the particle size of the scrap metal particles to be any particular size as is well known in the art. In the present invention, the particle size of the scrap metal particles is preferably within 10 mm. The present invention has no particular requirement on the chemical composition of the scrap metal scrap, and scrap metal scrap requiring remelting refining, which is well known in the art, may be used. In an embodiment of the invention, the scrap metal scrap is electrolytic manganese metal scrap or metal nickel scrap that is recovered at a high price.

In the invention, the feeding speed of the waste metal crushed aggregates is preferably 85-130 kg/h, more preferably 90-125 kg/h, and further preferably 100-110 kg/h. In the present invention, the scrap metal pieces are preferably continuously added.

In the invention, the deoxidizer preferably comprises a magnesium-calcium alloy, and the magnesium-calcium alloy preferably comprises, by mass, 20-35% of Ca and 65-80% of Mg. The magnesium-calcium alloy is used as a deoxidizer, strong affinity exists between Mg and Ca, and O, S, and the magnesium-calcium alloy can reduce volatilization of single metal when used as the deoxidizer, thereby being beneficial to desulfurization and deoxidation.

In the present invention, the amount of the deoxidizer to be added is preferably configured according to empirical formula (1) of the requirement of the oxygen content in the scrap metal pieces:

m_d＝28.8×(0.6～0.9)w_O·m_M/16 formula (1)

In the formula (1), m_dThe mass of the deoxidizer is kg; w is a_OIs the mass percentage of oxygen in the waste metal scraps; m is_MIs the mass of the granular waste metal scraps in kg.

In the present invention, the deoxidizer is preferably added in portions, and the addition amount and the number of times of the addition of each portion are not particularly required in the present invention, and the addition means well known in the art may be adopted. The invention can reduce the oxidation volatilization of the alloy by adding the alloy in batches, and can continuously reduce the waste metal particles.

In the invention, the principle of remelting and refining is as follows: the metal particles are melted into metal drops in the process of passing through the slag pool, the drops fall into the crystallizer and are converged into a molten pool, and water is condensed and solidified into a remelted metal ingot. Harmful elements (sulfur, phosphorus, lead, antimony, bismuth and tin) in the metal are transferred into the slag in the process and are effectively removed through slag-gold reaction and high-temperature gasification reaction.

After the feeding process is finished, the feeder is preferably closed, the power supply is closed after the current is maintained stable for 20-45 minutes, the water-cooling electrode is pulled out, and after slag and the remelted metal ingot are completely cooled, the crane is used for demoulding and hoisting to obtain the remelted metal ingot.

The slag for electroslag remelting and a method for recovering scrap metal scrap using electroslag remelting according to the present invention will be described in detail with reference to examples, but they should not be construed as limiting the scope of the present invention.

Example 1

Step 1: electroslag remelting is carried out on electrolytic manganese metal crushed aggregates by adopting CaF₂-Al₂O₃-CaO-Na₂O quaternary slag system with CaF as the mixture ratio (mass ratio)₂50% of Al₂O₃20% of CaO, 20% of Na₂O accounts for 10 percent; the used slag materials are treated as follows: CaO and Al₂O₃Oven drying at 1000 deg.C for 10 hr to obtain CaF₂Drying at 400 deg.C for 5 hr, and adding Na₂CO₃Drying at 300 deg.C for 3 hr; drying and converting sodium carbonate into Na₂The total slag amount after O is 150kg, and then the dried solid slag is heated and melted by using a slag melting furnace;

step 2: connecting a water-cooled electrode with a cooling water pipe, and connecting cooling water, wherein the outer diameter of the water-cooled electrode is 180mm, the wall thickness of an outer pipe of the water-cooled electrode is 10mm, and the wall thickness of an inner pipe of the water-cooled electrode is 3 mm;

and step 3: after the temperature of the liquid premelting slag is raised to 1450 ℃, preserving the heat for 5min and pouring the liquid premelting slag into a crystallizer, wherein the inner diameter of the crystallizer is 300 mm;

and 4, step 4: hoisting the water-cooled electrode by using a crane, connecting the upper end of the water-cooled electrode with an electric clamp at a lifting cross arm, and then inserting the water-cooled electrode into liquid premelting slag in a water-cooled crystallizer in a centering way to insert the liquid premelting slag with the insertion depth of 18 mm;

and 5: switching on a power supply to form a complete current loop, and adjusting the current to 5800A;

step 6: after the furnace condition is stable, starting a vibration feeder, controlling the feeding speed of the electrolytic manganese metal crushed aggregates at 100kg/h, and adding 303kg of electrolytic manganese metal crushed aggregates in total;

and 7: magnesium-calcium alloy (w (Mg)/w (Ca) 7:3) is used as a deoxidizer, the deoxidizer is divided into 5 parts, 249g of the deoxidizer is mixed into the electrolytic manganese metal crushed aggregates every 30 minutes, and the materials are added into a water-cooled crystallizer through a vibration feeder;

and 8: and after the feeding process is finished, closing the feeder, keeping the current stable for 30 minutes, then closing the power supply, pulling out the water-cooling electrode, and after the slag and the remelted metal ingot are completely cooled, performing demoulding and hoisting work by using a crane to obtain the remelted manganese ingot.

Respectively sampling from the upper, middle and lower parts of the remelted manganese ingot, and then determining the carbon content, the sulfur content and the oxygen content in the three groups of samples and the electrolytic manganese metal crushed material by using a carbon-sulfur analyzer and an oxygen-nitrogen analyzer. The results show that the content of carbon in the electrolytic manganese metal crushed aggregates is 0.0130%, the content of sulfur is 0.143%, and the content of dissolved oxygen is 0.106%; the carbon content of the upper, middle and lower parts of the remelted metal manganese ingot is respectively 0.0124%, 0.0135% and 0.0128%, the sulfur content is 0.01015%, 0.01023% and 0.01028%, and the oxygen content is 0.00512%, 0.00522% and 0.00519%. The desulfurization rate and the deoxidation rate of the manganese metal material are respectively 93 percent and 95 percent, and the recarburization phenomenon does not occur.

Example 2

In this embodiment, the electroslag remelting of the high-priced recycled metallic nickel crushed aggregates is performed according to the following steps:

step 1: using CaF₂-Al₂O₃-CaO-Na₂O quaternary slag system with CaF as the mixture ratio (mass ratio)₂50% of Al₂O₃20% of CaO, 20% of Na₂O accounts for 10 percent; the used slag materials are treated as follows: CaO and Al₂O₃Drying at 1000 deg.CDry for 10 hours, CaF₂Drying at 400 deg.C for 5 hr, and adding Na₂CO₃Drying at 300 deg.C for 3 hr; drying and converting sodium carbonate into Na₂The total slag amount after O is 400kg, and then a slag melting furnace is used for heating and melting solid slag; .

Step 2: connecting a water-cooled electrode with a cooling water pipe, and connecting cooling water, wherein the outer diameter of the water-cooled electrode is 240mm, the wall thickness of an outer pipe of the water-cooled electrode is 15mm, and the wall thickness of an inner pipe of the water-cooled electrode is 3 mm;

and step 3: after the temperature of the liquid premelting slag is raised to 1550 ℃, preserving the heat for 5min and pouring the liquid premelting slag into a water-cooled crystallizer, wherein the inner diameter of the crystallizer is 500 mm;

and 4, step 4: hoisting the water-cooled electrode by using a crane, connecting the upper end of the water-cooled electrode with an electric clamp at a lifting cross arm, and then inserting the water-cooled electrode into liquid premelting slag in a water-cooled crystallizer in a centering way to ensure that the inserting depth is 23 mm;

and 5: switching on a power supply to form a complete current loop, and adjusting the current to 9400A;

step 6: after the furnace condition is stable, starting a vibration feeder, controlling the feeding speed of the metal nickel crushed aggregates at 120kg/h, and totally adding 700kg of the metal nickel crushed aggregates;

and 7: magnesium-calcium alloy (w (Mg)/w (Ca) 7:3) is used as a deoxidizer, the deoxidizer is divided into 8 parts, 237g of the alloy is mixed into the metal nickel crushed aggregates every 40 minutes, and the metal nickel crushed aggregates are added into a crystallizer through a vibration feeder;

and 8: and after the feeding process is finished, closing the feeder, keeping the current stable for 40 minutes, then closing the power supply, pulling out the water-cooled electrode, and after the slag and the remelting metal ingot are completely cooled, performing demoulding and hoisting work by using a crane to obtain the remelting nickel ingot.

Respectively sampling from the upper, middle and lower parts of the remelted nickel ingot, and then determining the carbon content, the sulfur content and the oxygen content in the three groups of samples and the metal nickel crushed aggregates by using a carbon-sulfur analyzer and an oxygen-nitrogen analyzer. The results show that the carbon content in the metal nickel crushed aggregates is 0.0303%, the sulfur content is 0.207%, and the dissolved oxygen content is 0.136%; the carbon content of the upper, middle and lower parts of the remelting metal nickel ingot is respectively 0.0314%, 0.0335% and 0.0328%, the sulfur content is 0.01861%, 0.01890% and 0.01915%, and the oxygen content is respectively 0.00952%, 0.01002% and 0.01009%. The desulfurization rate and the deoxidation rate of the metallic nickel material are 91 percent and 93 percent respectively, and the recarburization phenomenon does not occur.

Comparative example 1

The only difference from example 1 is the use of a conventional CaF₂-Al₂O₃CaO slag system refining waste metal crushed aggregates with the proportion (mass ratio) of CaF₂60% of Al₂O₃20% of CaO and 20% of CaO, and the rest is the same as example 1.

Respectively sampling from the upper, middle and lower parts of the remelted manganese ingot, and then determining the carbon content, the sulfur content and the oxygen content in the three groups of samples and the electrolytic manganese metal crushed material by using a carbon-sulfur analyzer and an oxygen-nitrogen analyzer. The results show that the content of carbon in the electrolytic manganese metal crushed aggregates is 0.0130%, the content of sulfur is 0.143%, and the content of dissolved oxygen is 0.106%; the carbon content of the upper, middle and lower parts of the remelted metal manganese ingot is respectively 0.0130%, 0.0139% and 0.0132%, the sulfur content is 0.02217%, 0.02255% and 0.02191%, and the oxygen content is respectively 0.0181%, 0.0172% and 0.0195%. The desulfurization rate and the deoxidation rate of the manganese metal material are respectively 84 percent and 85 percent, and the recarburization phenomenon does not occur. The results of example 1 and comparative example 1 show that remelting refining using the slag provided by the present invention has better desulfurization ability and deoxidation ability.

Comparative example 2

Except that the magnesium-calcium alloy is not added, the other process parameters are the same as those of the embodiment 1.

Comparative example 2 the electrolytic manganese metal crushed material had a carbon content of 0.0130%, a sulfur content of 0.143%, and a dissolved oxygen content of 0.106%; respectively sampling the upper, middle and lower parts of the remelted metal manganese ingot, and then determining the carbon content and the sulfur content in the three groups of samples by using a carbon-sulfur analyzer and an oxygen-nitrogen analyzer. As a result, the carbon contents of the upper, middle and lower parts of the remelted metal manganese ingot were found to be 0.0133%, 0.0149% and 0.0137%, respectively, the sulfur contents were 0.01441%, 0.01458% and 0.01455%, respectively, and the oxygen contents were 0.00931%, 0.00971% and 0.00957%, respectively. The desulfurization rate of the manganese metal material is 89%, and the deoxidation rate of the manganese metal material is 91%.

The results of example 1 and comparative example 2 show that the addition of magnesium calcium alloy to deoxidize during the remelting process to refine and recover the scrap metal particles effectively reduces the sulfur and oxygen content of the manganese metal without increasing the carbon content.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.