Preparation method of high-chromium vanadium-titanium magnetite pellets

Abstract

The invention relates to a preparation method of high-chromium vanadium-titanium magnetite pellets, which comprises: drying the high-chromium vanadium-titanium magnetite so that its water content is less than or equal to 1.4%; drying the dried magnetite and Bentonite is dry-mixed for 10-15 minutes, and then wet-mixed with water for 10-15 minutes; the wet-mixed raw materials are placed in a constant temperature condition of 25-30°C for 30-35 minutes; the raw materials after stewing are put into a pelletizer Prepare green balls with a diameter of 10-12.5mm; dry the green balls; roast the dried green balls, heat the balls to 800-900°C at a heating rate of 10-12°C / min, then press 4-6 The heating rate of ℃ / min is raised to 1150-1200 ℃, and roasted for 15-20 minutes; then the temperature is lowered at a cooling rate of 5-8 ℃ / min, and the temperature is lowered to 300 ℃, taken out, and air-cooled. The water evaporation rate of the present invention is small when the material is stewed; the pelletizing efficiency is high; the drying time of the pellets is short, and the compressive strength of the pellets after drying is high; the roasting temperature is low and the time is short; the obtained pellets have a high low-temperature reduction powdering rate , The reduction expansion rate is small, the reduction is high, the reflow temperature is high, and the reflow range is narrow.

Description

Technical field [0001] The invention belongs to the field of ironmaking raw material production, and specifically relates to a method for preparing high-chromium vanadium-titanium magnetite pellets. Background technique [0002] With the development of vanadium-titanium magnetite smelting technology, the Fe, Ti, V, Cr and other valuable elements in chromium-containing vanadium-titanium ore have been fully utilized, and blast furnace titanium slag, vanadium slag and other resources are comprehensively recycled It provides our country with precious resources of titanium, chromium and vanadium. With the advancement of vanadium-titanium magnetite beneficiation technology, the cost of beneficiation has been reduced, and the output and iron grade have been improved. [0003] The vanadium-titanium magnetite in the Hongge area of ​​Panxi, Sichuan is a complex multi-element associated ore. Its main Fe and Ti elements consist of magnetite, titanomagnetite and ilmenite, and other valuable el...

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Problems solved by technology

[0007] In order to solve the above-mentioned problems of the prior art, the present invention provides a kind of preparation method of high-chromium type vanadium-titanium magnetite pellets, which solves the problems of high water evaporation rate, large water loss and the problem of mixture in the prior art when stewing the material. Humidity fluctuates greatly; pellet drying time is long, pellet surface is not complete; pellet roasting time is long, roasting temperature is high, pellet production efficiency is low, energy consumption is high, and cost is high

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