Method for producing high titanium type acid pellet vanadium titanium by chain grate - rotary kiln

Abstract

This invention discloses a method for producing Ti-rich V-Ti oxidized pellets by chain grate and rotary kiln. The method comprises: mixing vanadic titanomagnetite concentrate with common magnetite concentrate at a weight ratio of 7:3, adding 2.0 wt. % of bentonite, palletizing to obtain 8-16 mm pellets by a disc pelletizer, drying (50-350 deg.C) and pre-heating (500-1000 deg.C) by a chain grate for 12 min, sending dried pellets into a rotary kiln, torrefying at 1150-1300 deg.C and 1.0 r/min for 30-35 min, and cooling torrefied pellets. The obtained Ti-rich V-Ti oxidized pellets have compression strength higher than 1800 N, and TiO2 content of 7.0%, thus can meet the requirement of blast furnace smelting.

Description

technical field [0001] The invention relates to a production process of oxidized pellets, in particular to a method for producing high-titanium vanadium-titanium oxidized pellets by using a grate machine-rotary kiln. Background technique [0002] Pellet is one of the main raw materials in ironmaking production. According to the needs of ironmaking, its shape is mostly spherical with a diameter of 8mm to 16mm. Because there are abundant vanadium-titanium magnetite concentrates and ordinary magnetite concentrates in the Panxi area, the main raw materials for pellet production are vanadium-titanium magnetite concentrates and ordinary magnetite concentrates with high titanium content. The analysis of concentrate and ordinary magnetite concentrate shows that both vanadium-titanium magnetite concentrate and ordinary magnetite concentrate belong to weak ball-forming materials, and TiO in vanadium-titanium magnetite concentrate 2 The content is as high as about 11%, which has a gre...

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Problems solved by technology

Because there are abundant vanadium-titanium magnetite concentrates and ordinary magnetite concentrates in the Panxi area, the main raw materials for pellet production are vanadium-titanium magnetite concentrates and ordinary magnetite concentrates with high titanium content. The analysis of concentrate and ordinary magnetite concentrate shows that both vanadium-titanium magnetite concentrate and ordinary magnetite concentrate belong to weak ball-forming materials, and TiO in vanadium-titanium magnetite concentrate 2 The content is as high as about 11%, which has a great impact on the quality of the finished pellets and is not conducive to pelletizing. Even if the pellets are formed, the falling strength of the green pellets is also low, and the quality of the pellets is difficult to meet the requirements of grate drying and preheating. Requirements, resulting in a low burst temperature of green pellets, resulting in a large amount of powder, affecting the smooth flow of production and product quality, and is not conducive to the use of blast furnaces. Therefore, exploring a method for producing high-titanium vanadium-titanium oxide pellets will be conducive to the production of Vanadium-titanium oxide pellets whose quality meets the requirements ensure smooth and stable production of Panzhihua Iron and Steel Blast Furnace

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