Preparation and use process of abandoned slag ball applied to vanadium extraction from abandoned slag in vanadium industry

Abstract

The present application belongs to the technical field of metallurgical production equipment, and particularly relates to a preparation and use process of a slag ball for vanadium extraction from vanadium industry slag, wherein the preparation process of the slag ball is as follows: vanadium industry slag, iron oxide scale, sea sand and a binder are mixed in a ratio of 2:5:2:1, and then the ratio of the mixture is adjusted based on the condition that TFe in the slag ball is greater than or equal to 57% and the unbroken strength of 1.5 m falling is not broken; the mixture is cold-pressed into balls and subjected to drying treatment, and the moisture content of the slag ball is less than or equal to 1.50%; and the use process of the slag ball is as follows: the oxygen supply system is optimized, the oxygen supply time is greater than 5 minutes, and the oxygen supply time of each slag tapping furnace is greater than 5 minutes and 20 seconds; the gun position control is adjusted, the low gun position is used in the whole process of vanadium extraction when the Si content in the molten iron is greater than or equal to 0.2%, the low gun position is used to the high gun position and then to the low gun position when the Si content in the molten iron is less than 0.2%, and the low gun position is used in the last 40 seconds before the end of vanadium extraction. The problems of slag storage are solved, the production cost of the vanadium extraction converter is further reduced, and the iron and vanadium and other silicon metals in the vanadium industry slag are fully recovered.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of metallurgical production equipment, and particularly relates to a preparation and use process of abandoned slag balls for vanadium industry abandoned slag vanadium extraction. BACKGROUND

[0002] The vanadium industry abandoned slag is an industrial waste slag produced after the production of vanadium pentoxide by using vanadium slag, and the abandoned slag contains TFe: 25%-35%, V2O5: 0.9%-1.24%, and SiO2: 14.0%-20%. The abandoned slag is mainly treated by stacking. If the TFe and V noble metal elements and SiO2 in the abandoned slag are fully utilized through the abandoned slag ball making process and the use process of the abandoned slag ball in vanadium extraction, the comprehensive recycling of the vanadium industry abandoned slag can be realized. The vanadium industry abandoned slag mainly replaces iron concentrate powder to make balls by mixing with the oxide scale, and the produced cold-pressed balls are used as cold materials in the vanadium extraction converter, so that the recycling of the vanadium industry abandoned slag is realized. SUMMARY

[0003] In order to solve the above technical problems, the application provides a preparation and use process of abandoned slag balls for vanadium industry abandoned slag vanadium extraction. The vanadium industry abandoned slag is recycled, the problem of abandoned slag stacking is solved, the vanadium industry abandoned slag replaces iron concentrate powder, the production cost of the vanadium extraction converter is further reduced, the iron and vanadium and silicon metals in the vanadium industry abandoned slag are fully recovered, the abandoned slag ball can be used as a vanadium extraction slag adjusting agent (to reduce the viscosity of the vanadium slag) to increase the flowability of the vanadium slag, which is beneficial to reducing the MFe of the vanadium slag and improving the vanadium oxidation rate in the smelting process.

[0004] The technical scheme adopted by the application is as follows: a preparation and use process of abandoned slag balls for vanadium industry abandoned slag vanadium extraction, the preparation and use process of the abandoned slag balls is as follows:

[0005] The preparation process of the abandoned slag ball is as follows: the vanadium industry abandoned slag, the oxide scale, the sea sand ore and the binder are mixed according to the proportion of 2:5:2:1, then the proportion of the mixed material is adjusted according to the TFe≥57% in the abandoned slag ball and the 1.5m non-breaking strength, the cold-pressed balls are processed, and the drying treatment is performed, and the water content of the abandoned slag ball is ≤1.50%;

[0006] The use process of the abandoned slag ball is as follows:

[0007] The oxygen supply system is optimized, the oxygen supply time is greater than 5 minutes, and the oxygen supply time of the tapping furnace is greater than 5 minutes and 20 seconds;

[0008] The gun position control is adjusted, the low gun position is used in the whole vanadium extraction process when the Si content of the molten iron is greater than or equal to 0.2%, the low gun position is used to the high gun position and then to the low gun position when the Si content of the molten iron is less than 0.2%, and the low gun position is used in the last 40 seconds before the end of the vanadium extraction;

[0009] The tapping temperature is controlled, the tapping temperature is 1340℃-1400℃, the control of the non-tapping furnace is 1360℃, and the control of the tapping furnace is 1380℃;

[0010] In the process of extracting vanadium, when the Si content of hot metal is greater than 0.2%, the ball return is mainly used, and the discarded slag ball is used as an auxiliary; when the Si content of hot metal is between 0.15% and 0.2%, the discarded slag ball is mainly used, and the ball return is used as an auxiliary; when the Si content of hot metal is less than 0.15%, the discarded slag ball is used entirely;

[0011] Further, in the process of extracting vanadium, the vanadium slag modification process is as follows: the C element in the slag gathering agent is used to reduce FeO in the red-hot vanadium slag, to reduce the low-melting-point substance of the vanadium slag, to increase the melting point and viscosity of the vanadium slag; when the Si content of hot metal is less than 0.20%, the TFe content in the vanadium slag is between 0.31% and 0.33%, and the vanadium slag is relatively sticky and does not need to be modified; when the Si content of hot metal is between 0.20% and 0.25%, 150 kg of the slag gathering agent is added into the furnace after the oxygen blowing for extracting vanadium is completed; when the Si content of hot metal is between 0.25% and 0.30%, 200 kg of the slag gathering agent is added into the furnace after the oxygen blowing for extracting vanadium is completed; when the Si content of hot metal is greater than 0.30%, 250 kg of the slag gathering agent is added into the furnace after the oxygen blowing for extracting vanadium is completed.

[0012] The application has the following advantages: the vanadium industry discarded slag is mixed with iron concentrate powder and iron oxide scale, and then is subjected to ball pressing operation, the cold pressed ball uses low-priced vanadium industry discarded slag, and thus the production cost is reduced; the vanadium industry discarded slag is mixed with the iron oxide scale to make the cold pressed ball, and the TFe content in the cold pressed ball is required to be greater than or equal to 57% to ensure the grade of the vanadium slag in the process of extracting vanadium; the V2O5 content in the vanadium industry discarded slag is about 1.2%, which is much higher than the V2O5 content (0.3-0.7%) in the domestic vanadium-titanium ore powder, and thus the precious metal vanadium in the vanadium industry discarded slag can be effectively recycled through recycling; the SiO2 content in the vanadium industry discarded slag is between 14.0% and 20.0% for ball making, and the vanadium industry discarded slag can be used as a slag modifier for extracting vanadium in the converter, which is beneficial to reducing the MFe of the vanadium slag and increasing the vanadium oxidation rate. Embodiment

[0013] Example

[0014] A preparation and use process of discarded slag ball applied to vanadium industry discarded slag for extracting vanadium, the preparation and use process of the discarded slag ball comprises the following steps:

[0015] The preparation process of the discarded slag ball comprises the following steps: vanadium industry discarded slag, iron oxide scale, sea sand ore and a binder are mixed according to a ratio of 2:5:2:1, then the mixed material ratio is adjusted according to the TFe content in the discarded slag ball being greater than or equal to 57% and the 1.5 m non-breaking strength as a benchmark, the cold pressed ball is processed, and drying treatment is performed, and the water content in the discarded slag ball is less than or equal to 1.50%;

[0016] The use process of the discarded slag ball comprises the following steps:

[0017] The oxygen supply system is optimized, the oxygen supply time is greater than 5 minutes, and the oxygen supply time for each tapping furnace is greater than 5 minutes and 20 seconds;

[0018] Adjust the gun position control, Si≥0.2% molten iron when the low gun position is used in the whole process of vanadium extraction, Si<0.2% molten iron is used in low gun position to high gun position and then to low gun position, low gun position is used in the last 40 seconds of vanadium extraction;

[0019] The tapping temperature control is that the tapping temperature is 1340℃-1400℃, the tapping temperature of non-slag tapping furnace is controlled at 1360℃, and the tapping temperature of slag tapping furnace is controlled at 1380℃;

[0020] In the process of vanadium extraction, when Si>0.2% molten iron, the ball return is mainly used, and the slag ball is used as an auxiliary; when Si is 0.15-0.2% molten iron, the slag ball is mainly used, and the ball return is used as an auxiliary; when Si<0.15% molten iron, the slag ball is used;

[0021] In the process of vanadium extraction, the vanadium slag modification process is that the C element in the slag agent is used to reduce FeO in the red-hot vanadium slag, to reduce the low-melting-point material in the vanadium slag, and to improve the melting point and viscosity of the vanadium slag; when Si<0.20% molten iron, TFe in the vanadium slag is 0.31-0.33%, the vanadium slag is relatively sticky and does not need to be modified; when 0.20%<Si<0.25% molten iron, 150kg of slag agent is added into the furnace after the end of the vanadium extraction oxygen blowing; when 0.25%<Si<0.30% molten iron, 200kg of slag agent is added into the furnace after the end of the vanadium extraction oxygen blowing; when Si>0.30% molten iron, 250kg of slag agent is added into the furnace after the end of the vanadium extraction oxygen blowing.

[0022] The above examples have exemplarily described the present application, and it is obvious that the specific implementation of the present application is not limited by the above-mentioned manner. For those skilled in the art, it can be understood that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A process for preparing slag balls for vanadium extraction from vanadium industry waste slag, characterized in that: The preparation process of the discarded slag ball is as follows: ​ The vanadium industry discarded slag, iron oxide scale, sea sand and binder are mixed according to the ratio of 2:5:2:1, and then the mixture ratio is adjusted according to the basis of TFe≥57% in the discarded slag ball and the non-breaking strength of 1.5m drop; the ball is processed by cold pressing and dried, and the moisture of the discarded slag ball is ≤1.50%.

2. A process for using the reject ball produced in claim 1, characterized by: The use process of the discarded slag ball is as follows: The oxygen supply system is optimized, the oxygen supply time is greater than 5 minutes, and the oxygen supply time of the tapping furnace is greater than 5 minutes and 20 seconds; The gun position control is adjusted, the low gun position is used in the whole process of vanadium extraction when the Si content of the molten iron is greater than or equal to 0.2%, the low gun position is used to the high gun position and then to the low gun position when the Si content of the molten iron is less than 0.2%, and the low gun position is used 40 seconds before the end of vanadium extraction; The tapping temperature control is as follows: the tapping temperature is controlled at 1360℃ for the non-tapping furnace and at 1380℃ for the tapping furnace; In the process of vanadium extraction, the ball return is mainly used when the Si content of the molten iron is greater than 0.2%, the discarded slag ball is mainly used when the Si content of the molten iron is between 0.15% and 0.2%, and the discarded slag ball is used when the Si content of the molten iron is less than 0.15%.

3. The process for using the reject ball according to claim 2, characterized in that: In the process of vanadium extraction, the vanadium slag modification process is as follows: the C element in the slag gathering agent is used to reduce FeO in the red-hot vanadium slag, to reduce the low-melting-point material in the vanadium slag, and to improve the melting point and viscosity of the vanadium slag; when the Si content of the molten iron is less than 0.20%, the TFe content in the vanadium slag is between 0.31% and 0.33%, and the vanadium slag is relatively sticky and does not need to be modified.