CN112662897A - Process for improving vanadium recovery rate of vanadium extraction converter - Google Patents
Process for improving vanadium recovery rate of vanadium extraction converter Download PDFInfo
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- CN112662897A CN112662897A CN202011598203.7A CN202011598203A CN112662897A CN 112662897 A CN112662897 A CN 112662897A CN 202011598203 A CN202011598203 A CN 202011598203A CN 112662897 A CN112662897 A CN 112662897A
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Abstract
The invention discloses a process for improving the vanadium recovery rate of a vanadium extraction converter, relates to the technical field of steel smelting, and particularly comprises three parts of control of vanadium extraction oxygen supply parameters of an 80t converter, requirements on adding of vanadium extraction cold materials and control of a tapping process. The process is characterized in that under the condition of normal and stable operation of the converter, the vanadium extraction cold charge, process control, end point temperature and tapping time are controlled to reduce vanadium slag loss and improve the vanadium recovery rate of the vanadium extraction converter; the vanadium recovery rate of the vanadium extraction converter is improved by recycling the internal circulation material, controlling the oxygen supply time, controlling the end point temperature, increasing the tapping time of a tapping hole, and performing steel retaining operation; the recovery rate of vanadium of the vanadium extraction converter can be improved from 79.5% to more than 80.5% by the process, and the recovery rate of vanadium is obviously improved.
Description
The technical field is as follows:
the invention relates to the technical field of steel smelting, in particular to a process for improving the vanadium recovery rate of a vanadium extraction converter.
Background art:
vanadium is the most main precipitation strengthening element in microalloying elements, vanadium slag obtained by vanadium extraction through a converter is used as a raw material for extracting vanadium pentoxide, the vanadium content is high, the treatment capacity is small, vanadium slag iron is recycled, the roasting temperature is low, and the requirements on power and auxiliary materials are small; the vanadium extraction converter is used as an intermediate process for extracting vanadium by a fire method, plays a role in starting and stopping, and is very important for reducing vanadium loss and improving the vanadium recovery rate of the vanadium extraction converter so as to improve the vanadium recovery rate of a system.
The invention content is as follows:
the invention aims to overcome the defects of the prior art and provide a process for improving the vanadium recovery rate of a vanadium extraction converter.
The invention relates to a process for improving the recovery rate of vanadium in a vanadium extraction converter, which comprises the following specific process parameters:
(1) oxygen supply parameter control for vanadium extraction of 80t converter
The special three-hole Laval nozzle oxygen lance: the diameter of the throat is 28.5mm, the diameter of the outlet is 36.4mm, the Mach number is 1.98, and the included angle is 10.5 degrees;
oxygen working pressure: 0.7-0.75 MPa, 9500-10500 Nm 3/h of flow rate, 4min30 sec-5 min30 sec of oxygen supply time and 1.1 m-1.4 m of oxygen lance position;
(2) the addition requirement of the vanadium extraction cold charge
Adding 1/2-2/3 of cold charge after ignition of an oxygen lance, completely adding the rest part before oxygen supply for 3min, and controlling the end point temperature to 1340-1400 ℃ (controlling the deslagging heat according to 1380-1400 ℃);
(3) tapping process control
When the tapping time of the tapping hole is less than 3.5 minutes, the tapping hole is replaced after shimming is carried out on the tapping hole so as to ensure that the tapping time is more than or equal to 3.5 minutes;
and (3) steel remaining operation: pouring the vanadium slag once every 3-4 furnaces, and performing steel retaining operation without pouring the slag, wherein the steel retaining operation is not performed in the slag pouring furnace, so that the amount of waste steel in the vanadium slag is reduced;
slag stopping control: slag blocking is carried out by using slag blocking balls, the density of the slag blocking balls is more than 4.2g/cm3, and meanwhile, slag conglomeration agent is added before tapping when the Si and Ti content of molten iron is more than 0.60 percent.
The invention has the advantages that:
1. the process is characterized in that under the condition of normal and stable operation of the converter, the vanadium extraction cold charge, process control, end point temperature and tapping time are controlled to reduce vanadium slag loss and improve the vanadium recovery rate of the vanadium extraction converter;
2. the vanadium recovery rate of the vanadium extraction converter is improved by recycling the internal circulation material, controlling the oxygen supply time, controlling the end point temperature, increasing the tapping time of a tapping hole, and performing steel retaining operation;
3. the recovery rate of vanadium of the vanadium extraction converter can be improved from 79.5% to more than 80.5% by the process, and the recovery rate of vanadium is obviously improved.
Description of the drawings:
FIG. 1 is a flow chart of vanadium extraction in a converter.
The specific implementation mode is as follows:
referring to fig. 1, which is a flow chart of vanadium extraction in a converter, the coarsening part is a main line of vanadium extraction in the converter, and the vanadium extraction part in the converter is a main control part. Wherein, the process of the vanadium extraction cold material and the scrap steel part is as follows: the method comprises the following steps of discarding slag balls and pellet return ores, wherein the pellet return ores are blast furnace undersize and can be directly utilized, the discarding slag balls are subjected to cold press molding by adopting vanadium waste slag (vanadium-containing waste), iron scales and a binder according to a ratio of 6:3:1, and TFe in the discarding slag balls after cold press is more than or equal to 50%; .
The vanadium extraction waste steel comprises pig iron blocks and slag returning steel, and the mixing ratio of cold materials to the waste steel is as follows 1:
TABLE 1 converter vanadium extraction operation cold burden proportioning scheme
Example 1
A process for improving the recovery rate of vanadium in a vanadium extraction converter comprises the following specific process parameters:
(1) oxygen supply parameter control for vanadium extraction of 80t converter
The special three-hole Laval nozzle oxygen lance: the diameter of the throat is 28.5mm, the diameter of the outlet is 36.4mm, the Mach number is 1.98, and the included angle is 10.5 degrees;
oxygen working pressure: 0.7MPa, the flow rate is 9500 N.m 3/h, the oxygen supply time is 4min30 s, and the lance position of the oxygen lance is 1.1 m-1.4 m;
(2) the addition requirement of the vanadium extraction cold charge
1/2 of cold charge is added after the oxygen lance is ignited, the rest part is added completely before oxygen supply for 3min, and the end point temperature is controlled at 1340 ℃;
(3) tapping process control
When the tapping time of the tapping hole is less than 3.5 minutes, the tapping hole is replaced after shimming is carried out on the tapping hole so as to ensure that the tapping time is more than or equal to 3.5 minutes;
and (3) steel remaining operation: pouring the vanadium slag once every 3-4 furnaces, and performing steel retaining operation without pouring the slag, wherein the steel retaining operation is not performed in the slag pouring furnace, so that the amount of waste steel in the vanadium slag is reduced;
slag stopping control: slag blocking is carried out by using slag blocking balls, the density of the slag blocking balls is more than 4.2g/cm3, and meanwhile, slag conglomeration agent is added before tapping when the Si and Ti content of molten iron is more than 0.60 percent.
Example 2
A process for improving the recovery rate of vanadium in a vanadium extraction converter comprises the following specific process parameters:
(1) oxygen supply parameter control for vanadium extraction of 80t converter
The special three-hole Laval nozzle oxygen lance: the diameter of the throat is 28.5mm, the diameter of the outlet is 36.4mm, the Mach number is 1.98, and the included angle is 10.5 degrees;
oxygen working pressure: 0.75MPa, the flow rate of 10500 N.m 3/h, the oxygen supply time of 5min30 s and the oxygen lance position of 1.4 m;
(2) the addition requirement of the vanadium extraction cold charge
2/3 of cold charge is added after the oxygen lance is ignited, the rest part is completely added before oxygen supply for 3min, and the end point temperature is controlled at 1400 ℃;
(3) tapping process control
When the tapping time of the tapping hole is less than 3.5 minutes, the tapping hole is replaced after shimming is carried out on the tapping hole so as to ensure that the tapping time is more than or equal to 3.5 minutes;
and (3) steel remaining operation: pouring the vanadium slag once every 3-4 furnaces, and performing steel retaining operation without pouring the slag, wherein the steel retaining operation is not performed in the slag pouring furnace, so that the amount of waste steel in the vanadium slag is reduced;
slag stopping control: slag blocking is carried out by using slag blocking balls, the density of the slag blocking balls is more than 4.2g/cm3, and meanwhile, slag conglomeration agent is added before tapping when the Si and Ti content of molten iron is more than 0.60 percent.
Example 3
A process for improving the recovery rate of vanadium in a vanadium extraction converter comprises the following specific process parameters:
(1) oxygen supply parameter control for vanadium extraction of 80t converter
The special three-hole Laval nozzle oxygen lance: the diameter of the throat is 28.5mm, the diameter of the outlet is 36.4mm, the Mach number is 1.98, and the included angle is 10.5 degrees;
oxygen working pressure: 0.7-0.75 MPa, the flow rate is 10000 N.m 3/h, the oxygen supply time is-5 min, and the oxygen lance position is 1.2 m;
(2) the addition requirement of the vanadium extraction cold charge
7/12 of cold charge is added after the oxygen lance is ignited, the rest part is completely added before oxygen supply for 3min, and the end point temperature is controlled at 1380 ℃;
(3) tapping process control
When the tapping time of the tapping hole is less than 3.5 minutes, the tapping hole is replaced after shimming is carried out on the tapping hole so as to ensure that the tapping time is more than or equal to 3.5 minutes;
and (3) steel remaining operation: pouring the vanadium slag once every 3-4 furnaces, and performing steel retaining operation without pouring the slag, wherein the steel retaining operation is not performed in the slag pouring furnace, so that the amount of waste steel in the vanadium slag is reduced;
slag stopping control: slag blocking is carried out by using slag blocking balls, the density of the slag blocking balls is more than 4.2g/cm3, and meanwhile, slag conglomeration agent is added before tapping when the Si and Ti content of molten iron is more than 0.60 percent.
Claims (1)
1. A process for improving the recovery rate of vanadium in a vanadium extraction converter is characterized by comprising the following specific process parameters:
(1) oxygen supply parameter control for vanadium extraction of 80t converter
The special three-hole Laval nozzle oxygen lance: the diameter of the throat is 28.5mm, the diameter of the outlet is 36.4mm, the Mach number is 1.98, and the included angle is 10.5 degrees;
oxygen working pressure: 0.7 to 0.75MPa, the flow rate is 9500 to 10500 Nm 3/h, the oxygen supply time is 4.5 to 5.5min, and the oxygen lance position is 1.1 to 1.4 m;
(2) the addition requirement of the vanadium extraction cold charge
Adding 1/2-2/3 of cold charge after the ignition of the oxygen lance, completely adding the rest part before oxygen supply for 3min, and controlling the end point temperature to 1340-1400 ℃;
(3) tapping process control
When the tapping time of the tapping hole is less than 3.5 minutes, the tapping hole is replaced after shimming is carried out on the tapping hole so as to ensure that the tapping time is more than or equal to 3.5 minutes;
and (3) steel remaining operation: pouring the vanadium slag once every 3-4 furnaces, and performing steel retaining operation without pouring the slag, wherein the steel retaining operation is not performed in the slag pouring furnace, so that the amount of waste steel in the vanadium slag is reduced;
slag stopping control: slag blocking is carried out by using slag blocking balls, the density of the slag blocking balls is more than 4.2g/cm3, and meanwhile, slag conglomeration agent is added before tapping when the Si and Ti content of molten iron is more than 0.60 percent.
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| CN202011598203.7A CN112662897A (en) | 2020-12-30 | 2020-12-30 | Process for improving vanadium recovery rate of vanadium extraction converter |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101338351A (en) * | 2008-08-27 | 2009-01-07 | 攀钢集团研究院有限公司 | Vanadium-raising cooling agent, method for preparing same and use method |
| CN102912073A (en) * | 2012-11-08 | 2013-02-06 | 攀钢集团研究院有限公司 | Method for preventing vanadium extraction converter dry dedusting system from vented explosion |
| CN103924027A (en) * | 2014-04-29 | 2014-07-16 | 四川省川威集团有限公司 | Vanadium extraction steelmaking method |
| CN104073587A (en) * | 2014-07-18 | 2014-10-01 | 攀钢集团西昌钢钒有限公司 | Method for converter furnace vanadium refining |
| CN104694693A (en) * | 2015-03-16 | 2015-06-10 | 攀钢集团研究院有限公司 | Method for extracting vanadium and chromium from vanadium and chromium containing molten iron through converter |
| CN107760811A (en) * | 2016-08-17 | 2018-03-06 | 黄鸣 | A kind of opening new furnace smelting process of 80 tons of converters |
| CN109252011A (en) * | 2018-11-26 | 2019-01-22 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of vanadium-raising cooling agent and preparation method thereof and extraction vanadium method |
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2020
- 2020-12-30 CN CN202011598203.7A patent/CN112662897A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101338351A (en) * | 2008-08-27 | 2009-01-07 | 攀钢集团研究院有限公司 | Vanadium-raising cooling agent, method for preparing same and use method |
| CN102912073A (en) * | 2012-11-08 | 2013-02-06 | 攀钢集团研究院有限公司 | Method for preventing vanadium extraction converter dry dedusting system from vented explosion |
| CN103924027A (en) * | 2014-04-29 | 2014-07-16 | 四川省川威集团有限公司 | Vanadium extraction steelmaking method |
| CN104073587A (en) * | 2014-07-18 | 2014-10-01 | 攀钢集团西昌钢钒有限公司 | Method for converter furnace vanadium refining |
| CN104694693A (en) * | 2015-03-16 | 2015-06-10 | 攀钢集团研究院有限公司 | Method for extracting vanadium and chromium from vanadium and chromium containing molten iron through converter |
| CN107760811A (en) * | 2016-08-17 | 2018-03-06 | 黄鸣 | A kind of opening new furnace smelting process of 80 tons of converters |
| CN109252011A (en) * | 2018-11-26 | 2019-01-22 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of vanadium-raising cooling agent and preparation method thereof and extraction vanadium method |
Non-Patent Citations (2)
| Title |
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| 厉英等: "《冶金工艺设计》", 30 November 2014, 北京：冶金工业出版社 * |
| 干勇等: "《炼钢-连铸新技术800问》", 30 September 2003, 北京：冶金工业出版社 * |
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Application publication date: 20210416 |