Method for extracting multi-metallic element from high chromium vanadium titanium octahedral iron ore

Abstract

The invention discloses a method for extracting various metal elements from high chromium-vanadium titanomagnetite. The method is characterized in that high chromium-vanadium titanomagnetite concentrate is put in a rotary hearth furnace for direct reduction after feeding, briquetting and drying; during the reduction process, metallized pellets are obtained through the adjustment and the control of technological parameters such as reduction temperature, reducing atmosphere, etc., wherein, the metallization rate of the metallized pellets is more than 90 percent, and the carbon residue content thereof is 0.5 to 4.5 percent. The obtained metallized pellets are put in an electric stove, and then carbon-containing reducing agent that is pellets for smelting, wherein, the weight of the carbon-containing reducing agent is 8 to 35 percent of the metallized pellets; therefore, titanium slag and vanadium-chromium hot metal are obtained; the vanadium-chromium hot metal is performed through converting by the control of time and temperature under certain oxygen tension to obtain vanadium-chromium slag and semisteel. The titanium slag is processed through the existing technology of a sulfuric acid method or a chlorination method, the vanadium-chromium slag is processed according to certain working procedures, and then TiO2, V2O5 and Cr2O3 are finally extracted and obtained.

Description

technical field [0001] The invention belongs to the field of metal smelting, and in particular relates to a method for extracting various metal elements from high-chromium vanadium-titanium magnetite Background technique [0002] High-chromium vanadium-titanium magnetite is a compound ore mainly composed of iron, and multi-metal elements such as titanium, vanadium, and chromium are symbiotic. The reserves of high-chromium vanadium-titanium magnetite in Panzhihua Honggenan mining area are huge, and it is currently the largest in my country. One of the vanadium-titanium magnetite deposits. Compared with the vanadium-titanium magnetite in other mining areas in Panxi area, the high-chromium vanadium-titanium magnetite has the same content of iron, vanadium and titanium, but the chromium content is much higher. 2 o 3 up to 1.8%. The deposit is a polymetallic comprehensive utilization deposit with great economic value. [0003] The chromium content of Panzhihua vanadium-titaniu...

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Problems solved by technology

[0003] The chromium content of Panzhihua vanadium-titanium magnetite that has been developed and utilized is very low. The [Cr] that enters molten iron after blast furnace smelting has no recovery value. The current blast furnace ironmaking-converter vanadium extraction process only recovers iron and vanadium, and a large amount of Titanium enters the blast furnace slag and its content is low (TiO in slag 2 content of about 22%), there is no reasonable and effective economic means to recycle, resulting in a waste of titanium resources

The behaviors of chromium and vanadium in the smelting process are very similar. If high chromium vanadium titanium magnetite adopts blast furnace ironmaking-converter vanadium extraction process, although chromium can be recovered in the process of recovering vanadium, titanium resources cannot be recovered, which will lead to The comprehensive utilization rate of mineral resources is low

[0004] Traditional rotary kilns, tunnel kilns, shaft furnaces and other reduction furnaces combined with electric furnaces have some research and production practice on the comprehensive extraction of multi-metal elements from vanadium-titanium magnetite, but the common problems are low direct reduction temperature and high requirements for reducing atmosphere. The metallization rate is not high, the production capacity is small, and the chromium element cannot be extracted, etc.

The problem that this method exists is: (1) in the pelletizing process, adopt the mode of wrapping reducing agent powder outside pelletizing in the follow-up pelletizing machine, the reducing agent powder adhesion is poor, it is difficult to control to the required level of carbon content required; ( 2) The melting temperature of the electric furnace is not less than 1600°C, which has a great impact on the life of the lining; (3) Only simple melting is performed on the metallized pellets, and most of the metal elements such as titanium, vanadium, and chromium enter the electric furnace slag, and the resulting electric furnace The slag is a multi-metal oxide mixed slag, which is difficult to separate

The problems of this method are: (1) The drying temperature of the pellets is 80-90°C. In this temperature range, the drying time of the pellets is long and the heat consumption is large; (2) The metallized pellets are only simply melted in the electric furnace. , most of the vanadium element enters the slag, and the obtained electric furnace slag is a mixed slag containing titanium and vanadium, and the follow-up treatment is complicated; (3) the method does not recover and extract the chromium element, resulting in a waste of resources

The problems existing in this method are: (1) adopting the method of adding auxiliary materials to adjust the slag, the TiO in the slag obtained by electric furnace smelting 2 If the content is less than 23%, titanium resources cannot be recycled; (2) Cr, Ni, and Co components in alloy pig iron are not easy to control

The problems of this method are: (1) the direct reduction process of the rotary kiln is adopted, the production capacity of the metallized pellets and the metallization rate are mutually restricted, and it is difficult to realize industrial production; (2) the metallized pellets are only melted in the electric furnace to obtain molten iron and vanadium-titanium mixed slag, the vanadium-titanium mixed slag needs to be melted again to obtain vanadium-chromium oxide and titanium slag, the process is complicated and the energy consumption is high

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