Efficient smelting method of titanium slag

Abstract

The invention relates to the field of metallurgy, and provides an efficient titanium slag smelting method which comprises the following steps: controlling the total charging quantity of titanium concentrate in a single furnace according to the effective volume and rated power supply power of an electric furnace, blanking according to a fixed feeding speed, and calculating the total charging quantity of a reducing agent in the single furnace based on the total charging quantity of the titanium concentrate in the single furnace, blanking is carried out according to the feeding speed from high to low; the titanium concentrate and a reducing agent are conveyed into a smelting furnace to be subjected to continuous micro-negative-pressure smelting, first-time deslagging operation is carried out, a first part of titanium slag is obtained, and electrification is maintained; and when the total iron content of the first part of titanium slag is reduced to an expected value, electrifying is stopped, secondary slag tapping and iron tapping operation are carried out, and a second part of titanium slag and low-carbon molten iron are obtained. According to the method, on the premise that the unit furnace burden reducing agent adding amount and the unit power supply power are not changed, the furnace feeding system and the corresponding power supply power of the reducing agent are adjusted, so that the high-and-low carbon adding system and the low-and-low power supply system are formed, and the smelting efficiency in the titanium slag smelting process is effectively improved.

Description

Technical Field

[0001] The invention relates to the field of metallurgy, and more specifically to a high-efficiency smelting method of titanium slag. Background Art

[0002] The traditional titanium slag smelting method is to mix ilmenite with solid reducing agents such as anthracite or petroleum coke, add them to an electric furnace, and carry out reduction smelting at 1600-1800°C. The iron oxides in the ilmenite are selectively reduced to metallic iron, while the titanium oxides are enriched in the slag. After slag and iron separation, titanium slag and by-product pig iron are obtained. The core key indicators in the smelting process are unit power consumption, reducing agent consumption and titanium slag grade. The three indicators influence each other and are positively correlated. How to optimize the process technology route while ensuring that two of the smelting parameters remain unchanged to achieve the improvement of another smelting indicator is conducive to reducing the smelting cost of unit titanium slag and improving the overall competitiveness of the production line.

[0003] From the above-mentioned patent disclosure, it can be seen that titanium slag smelting generally uses titanium concentrate as raw material, carbon or reducing gas as reducing agent, and reduces the iron in titanium concentrate in solid-solid, solid-liquid and liquid-liquid systems, and then separates titanium and iron through magnetic separation or slag-gold separation. At the same time, the rapid reduction of titanium slag is promoted by means of material feeding and power transmission system and adding reducing auxiliary agents, but there are problems such as high unit material consumption and cumbersome operation. Summary of the invention

[0004] In view of this, the present invention proposes an efficient smelting method for titanium slag, which can increase the output of titanium slag by reducing agents and reduce waste by utilizing raw materials. Based on the above purpose, the present invention proposes an efficient smelting method of titanium slag, comprising the following steps: The total amount of titanium concentrate fed into a single furnace is controlled according to the effective volume and rated power of the electric furnace, and the material is unloaded at a fixed feeding speed; the total amount of reducing agent fed into a single furnace is calculated based on the total amount of titanium concentrate fed into the single furnace, and the material is unloaded at a feeding speed that is first high and then low; The titanium concentrate and the reducing agent are transported to a smelting furnace for continuous slight negative pressure smelting, and the first slag tapping operation is performed to obtain the first portion of titanium slag, and the power is maintained on; When the total iron content of the first portion of titanium slag drops to the expected value, the power is stopped and the second slag and iron tapping operations are carried out to obtain the second portion of titanium slag and low-carbon molten iron.

[0005] In some embodiments, the starting and ending times of the titanium concentrate and the reducing agent are the same.

[0006] In some embodiments, the titanium concentrate has a TiO2 content of 45 wt.%, and a total amount of weakly reducing metal / non-metal oxides ≤ 55 wt.%.

[0007] In some embodiments, the total amount of reducing agent added to a single furnace is 1.00 to 1.05 times the theoretical carbon content, that is, the carbon content coefficient is 1.00 to 1.05; The theoretical carbon content is the sum of the reducing agent requirements for complete reduction of weakly reducing metal / non-metal oxides in the titanium concentrate and considering burn-off.

[0008] In some embodiments, the reducing agent comprises artificial graphite, natural graphite or blue carbon, wherein the effective ingredient is ≥ 98.0 wt.%.

[0009] In some embodiments, the feeding speed that is first high and then low is that the carbonization coefficient at the initial stage of feeding is ≥1.0, the carbonization coefficient at the middle stage of feeding is 1.0, and the carbonization coefficient at the final stage of feeding is ≤1.0.

[0010] In some embodiments, the time point of the first slag discharge operation is when the amount of material entering the furnace accounts for 50-60wt.% of the total amount of material in the single furnace.

[0011] In some embodiments, the slag discharge amount of the first slag discharge operation ranges from 40 to 50 wt.% of the theoretical slag production amount.

[0012] In some embodiments, the expected value is that the total iron content of the molten titanium slag decreases by ≤0.1 wt.% / min.

[0013] In some embodiments, during the smelting process, the power supply varies with the total amount of material in the furnace, wherein the power supply varies in the range of 1.1 to 1.2 MWh / t.

[0014] The present invention has at least the following beneficial technical effects: The present invention proposes a method for efficiently smelting titanium slag, which comprises: controlling the total amount of titanium concentrate fed into a single furnace according to the effective volume and rated power supply of the electric furnace, and unloading the materials at a fixed feeding speed, calculating the total amount of reducing agent fed into a single furnace based on the total amount of titanium concentrate fed into the single furnace, and unloading the materials at a feeding speed that is first high and then low; transporting the titanium concentrate and the reducing agent to a smelting furnace for continuous micro-negative pressure smelting, performing a first slag tapping operation to obtain a first portion of titanium slag, and maintaining power on; when the total iron content of the first portion of titanium slag is reduced to an expected value, stopping power on, performing a second slag tapping and iron tapping operation, and obtaining a second portion of titanium slag and low-carbon molten iron.

[0015] Under the premise of ensuring that the amount of reducing agent added per unit charge and the unit power supply remain unchanged, the present invention adjusts the system of reducing agent entering the furnace and the corresponding power supply, thereby forming a carbon distribution system and power supply system that is high at first and low later, promoting the efficient reduction of iron in titanium concentrate, thereby effectively improving the smelting efficiency of the titanium slag smelting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 A flow chart of a method for efficiently smelting titanium slag according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0017] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0018] In addition, reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0019] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless specifically defined as in the embodiments of this application.

[0020] The present invention proposes a highly efficient smelting method for titanium slag. Figure 1 , including the following steps: The total amount of titanium concentrate fed into a single furnace is controlled according to the effective volume and rated power of the electric furnace, and the material is unloaded at a fixed feeding speed; the total amount of reducing agent fed into a single furnace is calculated based on the total amount of titanium concentrate fed into the single furnace, and the material is unloaded at a feeding speed that is first high and then low; The titanium concentrate and the reducing agent are transported to a smelting furnace for continuous slight negative pressure smelting, and the first slag tapping operation is performed to obtain the first portion of titanium slag, and the power is maintained on; When the total iron content of the first portion of titanium slag drops to the expected value, the power is stopped and the second slag and iron tapping operations are carried out to obtain the second portion of titanium slag and low-carbon molten iron.

[0021] In some embodiments, see Figure 1 , the starting and ending times of the titanium concentrate and reducing agent feeding are the same.

[0022] The present invention uses commercially available titanium concentrate as raw material and proposes a new method for efficient smelting of titanium slag. Its main features are: under the premise of ensuring that the amount of reducing agent added per unit charge and the unit power supply remain unchanged, by adjusting the optimization of the reducing agent feeding system and the fine-tuning of the corresponding power supply, a carbon distribution system and a power supply system of high first and low later are formed, which promotes the efficient reduction of iron in titanium concentrate, thereby effectively improving the smelting efficiency of the titanium slag smelting process. It can be applied within Panzhihua Iron and Steel Co., Ltd. and can also be promoted to other titanium slag smelting enterprises, and has a good prospect for promotion and application.

[0023] The purpose of the present invention is to reduce the smelting efficiency of titanium slag and the unit smelting power consumption and improve the grade of titanium slag by adjusting the reducing agent feeding system and optimizing the corresponding power supply without adding new equipment or changing the theoretical raw material composition. In order to achieve the above purpose, the present invention provides a high-efficiency smelting method of titanium slag, characterized in that the method comprises the following steps: Mixing materials: Based on the effective volume of the electric furnace and the rated power supply, the total amount of titanium concentrate fed into the furnace is controlled, and the material is continuously fed at a fixed feeding speed. The total amount of reducing agent fed into the furnace is determined according to the total amount of titanium concentrate fed into the furnace, and the material is continuously fed at a feeding speed that starts high and then decreases. The starting and ending times of the titanium concentrate and reducing agent feeding are synchronized.

[0024] Smelting: The titanium concentrate and reducing agent are conveyed to the smelting furnace by belt conveyor through the batching system of step 1 for continuous micro-negative pressure smelting. After the material is discharged to a certain proportion of the total material, a slag discharge operation is carried out to obtain the first portion of titanium slag. The slag discharge amount is determined according to the actual total amount of material discharged; after the slag discharge is completed, the material is continuously discharged until all the raw materials of the single furnace are fully fed into the furnace for smelting, and the power is maintained for a period of time, and the change of TFe content in the titanium slag is continuously monitored.

[0025] Iron tapping: After the total iron content of the molten titanium slag is reduced to the expected value, the power is turned off, and the slag tapping and iron tapping operations are carried out in sequence to obtain the second portion of titanium slag and low-carbon molten iron. After the iron tapping is completed, steps 1 to 3 are repeated to continue the smelting of the next batch.

[0026] The present invention can ensure full utilization of the reducing agent in the smelting process by accurately controlling the time and amount of the reducing agent entering the furnace, avoiding excessive or insufficient reducing agent, thereby improving the smelting efficiency. According to the needs of the smelting process, the power supply is adjusted in time to ensure that the energy supply in the smelting process matches the demand, further improving the smelting efficiency. The high-first-lower carbon distribution system and the power supply system help to stabilize the temperature and atmosphere in the smelting process, thereby ensuring the stability of the quality of the smelted products. By optimizing the use of reducing agents and fine-tuning the power supply, the generation and accumulation of impurities in the smelting process can be reduced, and the purity of the product can be improved. By accurately controlling the amount of reducing agent, the waste of reducing agent can be avoided, thereby reducing production costs. In electric furnace smelting, by optimizing the carbon distribution system and the power supply system, the high-temperature reduction consumption of the electrode can be reduced, thereby extending the service life of the electrode.

[0027] In some embodiments, see Figure 1 The titanium concentrate has a TiO2 content of 45wt.%, and a total amount of weakly reducing metal / non-metal oxides ≤55wt.%.

[0028] The titanium concentrate contains 45wt.% TiO2, and the total amount of weakly reducing metal / non-metal oxides such as iron, manganese, silicon, etc. is ≤55wt.%.

[0029] The main component of titanium concentrate is titanium dioxide (TiO2), which usually contains 45% to 50%. In addition, titanium concentrate also contains a certain amount of iron, usually in the form of FeO or Fe2O3. Some titanium concentrates also contain small amounts of phosphorus, sulfur, magnesium, calcium and other elements, as well as rare metals such as vanadium and scandium.

[0030] In some embodiments, see Figure 1 The total amount of reducing agent added to a single furnace is 1.00 to 1.05 times the theoretical carbon content, that is, the carbon content coefficient is 1.00 to 1.05; The theoretical carbon content is the sum of the reducing agent requirements for complete reduction of weakly reducing metal / non-metal oxides in the titanium concentrate and considering burn-off.

[0031] When the carbon ratio is within this range, sufficient carbon source is provided to reduce metal oxides, which can ensure that there are sufficient reducing agents to participate in the reaction during the smelting process, and the reduction reaction can be more thorough, thereby increasing the reduction rate of the metal and reducing the unreacted metal oxide residues, thereby accelerating the smelting process and improving smelting efficiency. By accurately controlling the carbon ratio, the energy consumption in the smelting process can be optimized, unnecessary waste can be reduced, and energy consumption can be reduced.

[0032] In some embodiments, see Figure 1 The reducing agent includes artificial graphite, natural graphite or blue carbon, wherein the effective ingredient is ≥98.0wt.%.

[0033] The main component of the reducing agent is activated carbon powder, including artificial graphite, natural graphite or blue carbon. Activated carbon powder has a highly developed pore structure and a huge specific surface area, which enables it to effectively adsorb and reduce harmful substances in various gases and liquids. Its pore structure includes micropores, mesopores and macropores, which can adsorb small molecules, larger molecules of organic matter, and serve as a transmission channel, allowing the adsorbate to quickly enter the internal pores of the activated carbon. This efficient adsorption and reduction ability makes the activated carbon powder perform well in the reduction reaction.

[0034] In some embodiments, see Figure 1 The feeding speed that is first high and then low is that the carbonization coefficient at the initial stage of feeding is ≥1.0, the carbonization coefficient at the middle stage of feeding is 1.0, and the carbonization coefficient at the final stage of feeding is ≤1.0.

[0035] In the early stage of the reaction, a higher feed rate can provide sufficient reducing agent to make the reaction proceed quickly. This helps to accelerate the reaction process and improve production efficiency. As the reaction proceeds, gradually reducing the feed rate can ensure that the reaction remains stable in the later stage. This helps to avoid excessive reaction and reduce energy consumption and equipment wear.

[0036] A high-to-low feeding rate ensures that the reducing agent is fully utilized during the reaction. By optimizing the feeding rate, the unreacted reducing agent and reactant residue can be reduced, thereby improving the reduction efficiency. It helps to control the temperature and atmosphere during the reaction, thereby reducing the generation of impurities. This helps to improve the purity and quality of the product. It affects the crystal structure and particle size distribution of the product. A high-to-low feeding rate helps to obtain a product with a uniform structure and moderate particle size.

[0037] In some embodiments, see Figure 1 The time point of the first slag discharge operation is when the amount of material entering the furnace accounts for 50-60wt.% of the total amount of material in a single furnace.

[0038] During the smelting process, as the reaction proceeds, slag will gradually accumulate in the furnace. If the slag is too much, it will affect the stability and efficiency of the smelting process. Therefore, the first slag tapping operation is carried out when the amount of material entering the furnace reaches half, which can effectively reduce the accumulation of slag and keep the furnace clean and stable. The slag tapping operation can take away some heat and help control the temperature during the smelting process. Slag tapping when the amount of material entering the furnace accounts for half can ensure that the smelting temperature is within an appropriate range and avoid the adverse effects of too high or too low temperature on the smelting process. By tapping the slag in time, the reaction process in the smelting process can be accelerated. Because the reduction in the amount of slag helps the reactants to fully contact and mix, thereby increasing the reaction rate. The slag tapping operation can reduce the resistance in the furnace and reduce energy consumption. Slag tapping when the amount of material entering the furnace accounts for half can ensure that the resistance in the furnace remains at a low level, thereby reducing energy consumption and improving smelting efficiency.

[0039] In some embodiments, see Figure 1 The slag discharge amount of the first slag discharge operation ranges from 40 to 50 wt.% of the theoretical slag production amount.

[0040] During the smelting process, double slag operation may require multiple slag tapping during the smelting process, with the amount of slag tapped each time being less than half of the theoretical slag production. , which can effectively reduce the accumulation of slag and keep the furnace clean and stable. It makes the contact and mixing between the reactants more complete, thereby increasing the reaction rate. This helps to accelerate the smelting process and improve production efficiency. : Excessive slag will increase the generation and emission of harmful gases. Slag tapping can reduce the emission of harmful gases and reduce pollution to the environment. This meets environmental protection requirements and helps achieve sustainable development.

[0041] In some embodiments, see Figure 1 , the expected value is that the total iron content of the molten titanium slag decreases by ≤0.1wt.% / min.

[0042] The reduction of total iron content in molten titanium slag means that the purity of titanium slag has been improved. High-purity titanium slag can be used as high-quality raw materials for the production of high-quality titanium dioxide, sponge titanium and other products, thereby improving the quality and performance of these products. Iron is one of the main impurities in titanium slag, and the reduction of its content means the improvement of the purity of titanium slag. When the rate of decrease of iron content slows down to the expected value, it indicates that the iron content in titanium slag has reached a lower level. At this time, secondary slag tapping can further remove the remaining impurities and improve the purity of titanium slag. Secondary slag tapping can remove the amount of slag accumulated in the furnace, reduce the interference of slag on the smelting process, and thus improve the smelting efficiency. At the same time, by controlling the timing and amount of slag tapping, the smelting process parameters can be optimized to achieve a more stable smelting process.

[0043] In some embodiments, see Figure 1During the smelting process, the power supply varies with the total amount of material in the furnace, and the power supply varies in the range of 1.1~1.2MWh / t.

[0044] The power supply changes with the total amount of material in the furnace, which can ensure that energy is reasonably distributed according to the actual situation of the material during the smelting process. When the amount of material is large, increasing the power supply can increase the smelting speed; when the amount of material is reduced, reducing the power supply can avoid unnecessary energy waste. By adjusting the power supply, the chemical reaction process of the material in the furnace can be accelerated. Especially in the early stage of smelting, the material needs more energy to start the reaction. At this time, increasing the power supply can significantly improve the smelting efficiency.

[0045] The composition of the titanium concentrate used in the embodiments of the present invention is shown in Table 1.

[0046] Table 1 Element <![CDATA[TiO2]]> FeO <![CDATA[Fe2O3]]> MgO MnO <![CDATA[SiO2]]> <![CDATA[Al2O3]]> <![CDATA[V2O5]]> Content / wt.% 49.5 39.7 3.7 4.2 0.9 1.5 0.4 ＜0.1 Example 1 Batching and smelting parameters: Taking a single furnace with a total input of 100t of titanium concentrate as an example, the titanium concentrate is continuously fed at a fixed feeding rate of 20t / h. The carbon ratio of the corresponding synchronous feeding is evenly reduced from 1.15 at the beginning of smelting to 0.85 at the end, and the comprehensive carbon ratio is 1.0. After the feeding starts, the smelting is powered on at a unit raw material power of 1.1MWh / t. When the feeding amount reaches 50%, the first slag is tapped to obtain the first portion of titanium slag, and the slag amount is 40% of the theoretical slag production. After the slag is tapped, the same unit raw material power is used to continuously feed the material and power is turned on until the reaction end point is reached, and the slag and iron tapping operations are performed to obtain the second portion of titanium slag and low-carbon molten iron.

[0047] Smelting effect: The first titanium slag grade (TiO2 content) is 78.5wt.%, the second titanium slag grade (TiO2 content) is 76.3wt.%, the single furnace smelting time is 5.8h, and the power consumption per ton of slag is 2040kWh / t.

[0048] Example 2 Batching and smelting parameters: Taking a single furnace with a total input of 100t of titanium concentrate as an example, the titanium concentrate is continuously fed at a fixed feeding rate of 20t / h. The carbon ratio of the corresponding synchronous feeding is evenly reduced from 1.3 in the early stage of smelting to 0.7 in the late stage, and the comprehensive carbon ratio is 1.0. After the feeding starts, the smelting is powered on at a unit raw material power of 1.1MWh / t. When the feeding amount reaches 60%, the first slag is tapped to obtain the first portion of titanium slag, and the slag output is 50% of the theoretical slag output. After the slag is tapped, the same unit raw material power is used to continuously feed the material and power is turned on until the reaction end point is reached, and the slag and iron tapping operations are performed to obtain the second portion of titanium slag and low-carbon molten iron.

[0049] Smelting effect: The first titanium slag grade (TiO2 content) is 81.2wt.%, the second titanium slag grade (TiO2 content) is 76.5wt.%, the single furnace smelting time is 5.6h, and the power consumption per ton of slag is 1880kWh.

[0050] Example 3 Batching and smelting parameters: Taking a single furnace with a total input of 100t of titanium concentrate as an example, the titanium concentrate is continuously fed at a fixed feeding rate of 20t / h. The carbon ratio of the corresponding synchronous feeding is unevenly reduced from 1.3 in the early stage of smelting to 0.8 in the late stage, and the comprehensive carbon ratio is 1.05. After the feeding starts, the smelting is powered on at a unit raw material power of 1.2MWh / t. When the feeding amount reaches 60%, the first slag is tapped to obtain the first portion of titanium slag, and the slag output is 50% of the theoretical slag output. After the slag is tapped, the same unit raw material power is used to continuously feed the material and power is turned on until the reaction end point is reached, and the slag and iron tapping operations are performed to obtain the second portion of titanium slag and low-carbon molten iron.

[0051] Smelting effect: The first titanium slag grade (TiO2 content) is 82.8wt.%, the second titanium slag grade (TiO2 content) is 76.9wt.%, the single furnace smelting time is 5.5h, and the power consumption per ton of slag is 1790kWh.

[0052] Comparative Example The same smelting furnace body, titanium concentrate and reducing agent as in the embodiment were used, and the titanium concentrate was continuously fed at a fixed feeding rate of 20 t / h, and the corresponding synchronous carbon addition coefficient was maintained at 1.0. The power supply of the unit raw material was used for smelting, and slag was discharged during the period until the reaction was completed. The slag and iron tapping operations were performed. The obtained titanium slag grade (TiO2 content) was 75.8wt.%, and the single furnace smelting time was 6.4h, and the power consumption per ton of slag was 2250kWh.

[0053] Test Example 1 The vanadium content and the aluminum content of the alloy in the smelting slag obtained in the examples and comparative examples were analyzed. The main technical indicators of the test examples 1 to 3 and the comparative examples are shown in Table 2.

[0054] Table 2

[0055] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0056] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0057] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An efficient smelting method for titanium slag, characterized in that: The following steps are involved: The total amount of titanium concentrate fed into a single furnace is controlled according to the effective volume and rated power of the electric furnace, and the material is unloaded at a fixed feeding speed; the total amount of reducing agent fed into a single furnace is calculated based on the total amount of titanium concentrate fed into the single furnace, and the material is unloaded at a feeding speed that is first high and then low; The titanium concentrate and the reducing agent are transported to a smelting furnace for continuous slight negative pressure smelting, and the first slag tapping operation is performed to obtain the first portion of titanium slag, and the power is maintained on; When the total iron content of the first portion of titanium slag drops to the expected value, the power is stopped and the second slag and iron tapping operations are carried out to obtain the second portion of titanium slag and low-carbon molten iron.

2. The efficient smelting method of titanium slag according to claim 1, characterized in that: The starting and ending times of the titanium concentrate and reducing agent feeding are the same.

3. The efficient smelting method of titanium slag according to claim 1, characterized in that: The titanium concentrate has a TiO2 content of 45wt.%, and a total amount of weakly reducing metal / non-metal oxides of ≤55wt.%.

4. The efficient smelting method of titanium slag according to claim 3, characterized in that: The total amount of reducing agent added to a single furnace is 1.00 to 1.05 times the theoretical carbon content, that is, the carbon content coefficient is 1.00 to 1.05; The theoretical carbon content is the sum of the reducing agent requirements for complete reduction of weakly reducing metal / non-metal oxides in the titanium concentrate and considering burn-off.

5. The efficient smelting method of titanium slag according to claim 1, characterized in that: The reducing agent comprises artificial graphite, natural graphite or blue carbon, wherein the effective component is ≥ 98.0wt.%.

6. The efficient smelting method of titanium slag according to claim 3, characterized in that: The feeding speed which is first high and then low is that the carbonization coefficient at the initial stage of feeding is ≥1.0, the carbonization coefficient at the middle stage of feeding is 1.0, and the carbonization coefficient at the final stage of feeding is ≤1.

0.

7. The efficient smelting method of titanium slag according to claim 1, characterized in that: The time point of the first slag discharge operation is when the amount of material fed into the furnace accounts for 50-60wt.% of the total amount of material in the single furnace.

8. The efficient smelting method of titanium slag according to claim 1, characterized in that: The slag discharge amount of the first slag discharge operation ranges from 40 to 50 wt.% of the theoretical slag production amount.

9. The efficient smelting method of titanium slag according to claim 1, characterized in that: The expected value is that the total iron content of the molten titanium slag decreases by ≤0.1wt.% / min.

10. The high-efficiency smelting method of titanium slag according to claim 1, characterized in that: During the smelting process, the power supply varies with the total amount of material in the furnace, and the power supply varies in the range of 1.1~1.2MWh / t.

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