Preparation method of high-chromium vanadium-titanium magnetite pellets

Abstract

The invention relates to a preparation method of high-chromium vanadium-titanium magnetite pellets. The preparation method comprises the steps that (1) drying high-chromium vanadium-titanium magnetite to enable the moisture content of the high-chromium vanadium-titanium magnetite to be less than or equal to 1.4%; (2) dry-mixing the dried magnetite with bentonite for 10-15 min and then spraying water to conduct wet-mixing for 10-15 min; (3) braising a wet-mixed raw material under the constant-temperature conditions of 25-30 DEG C for 30-35 min; (4) putting the braised raw material into a pelletizer to prepare green pellets with the diameter being 10-12.5 mm; (5) drying the green pellets; (6) sintering the dried green pellets, heating the green pellets to 800-900 DEG C at the heating rate of 10-12 DEG C / min, heating the green pellets to 1150-1200 DEG C at the heating rate of 4-6 DEG C / min and then roasting the green pellets for 15-20 min; and (7) cooling the green pellets to 300 DEG C at the cooling rate of 5-8 DEG C / min and then taking out the pellets for air cooling. By means of the preparation method, the water evaporation rate is small during material braising; the pelletizing efficiency is high; the pellet drying time is short; the compressive strength of dried pellets is high; the roasting temperature is low, and the time is short; the low-temperature reduction degradation rate of the manufactured pellets is high; the reduction expansion rate is small; the reducibility is high; the softening-melting temperature is high; and the softening-melting interval 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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