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Preparation method of vanadium-titanium iron concentrate magnetized pellets for shaft furnace

A technology of vanadium-titanium-iron concentrate and pellets, which is applied in the field of preparation of vanadium-titanium-iron concentrate magnetized pellets for shaft furnaces, can solve the problems that the reduction process of blast furnaces and shaft furnaces cannot be carried out normally, and improve the desulfurization effect and equipment The effect of few and simple process steps

Active Publication Date: 2016-01-20
云霄县食品快检中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some are normal expansion, some are abnormal expansion, and some are catastrophic expansion, so that the reduction process of blast furnace and shaft furnace cannot be carried out normally

Method used

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  • Preparation method of vanadium-titanium iron concentrate magnetized pellets for shaft furnace

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Effect test

preparation example Construction

[0030] The preparation method of the vanadium-titanium-iron concentrate magnetized pellets for the shaft furnace provided by the embodiment of the present invention comprises:

[0031] Step S101: mixing materials;

[0032] Mix the vanadium-titanium-iron concentrate powder and the binder according to the following weight ratio: vanadium-titanium-iron concentrate powder: binder=100:2-6.

[0033] Step S102: making pellets;

[0034] The mixed material is pelletized to obtain raw pellets. The pelletizing equipment is a disc pelletizer. The rotation frequency of the disk pelletizer is 2936Hz, the inclination angle is 30°~45°, and the pelletizing time is 20~ After 30 minutes, the obtained pellets have a diameter of 7-20 mm and a water content of 5-8%. The particle size of the green pellets is preferably 10mm-15mm.

[0035] Step S103: drying;

[0036] The green pellets are dried, and the green pellets are dried in a blast drying oven, the drying temperature of the blast drying ove...

Embodiment 1

[0043] The vanadium-titanium iron concentrate and the binder are uniformly mixed in a weight ratio of 100:2, the vanadium-titanium iron concentrate has a particle size of -200 mesh, accounting for 55%, and the binder is bentonite. The mixture is rolled and formed into round pellets on a disc pelletizer, and the maximum radial dimension of the pellets is 9mm. The green pellets were dried in a blast drying oven at a drying temperature of 220°C and a drying time of 50 minutes. The CO content was 5%, the calcination temperature was 1000°C, and the calcination time was 100min to obtain magnetized pellets, which were cooled under nitrogen protection. After testing, the magnetic susceptibility of the obtained magnetized pellets is 0.64, the sulfur removal rate is 86%, the compressive strength is 760N, the drop strength is 5 times / ball, and the linear expansion rate is 3% in the direct reduction process of the gas-based shaft furnace.

Embodiment 2

[0045]The vanadium-titanium iron concentrate and the binder are uniformly mixed in a weight ratio of 100:3, the vanadium-titanium iron concentrate has a particle size of -200 mesh, accounting for 60%, and the binder is bentonite. The mixture is rolled and formed into round pellets on a disc pelletizer, and the maximum radial dimension of the pellets is 15mm. The green pellets were dried in a blast drying oven at a drying temperature of 180°C and a drying time of 60 minutes. The CO content was 10%, the calcination temperature was 1100°C, and the calcination time was 110min to obtain magnetized pellets, which were cooled under nitrogen protection. After testing, the magnetic susceptibility of the obtained magnetized pellets is 0.62, the sulfur removal rate is 89%, the compressive strength is 1086N, the drop strength is greater than 20 times / ball, and the linear expansion rate is 2% during the direct reduction process of the gas-based shaft furnace.

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Abstract

The invention discloses a preparation method for vanadium-titanium-iron concentrate magnetized pellets for a shaft furnace. The method comprises the steps: a, mixing of raw materials: mixing uniformly a vanadium-titanium-iron concentrate powder and a binder according to the following weight ratio: wherein the weight ratio of the vanadium-titanium-iron concentrate powder to the binder is 100: 2-6; b, pelletizing: pelletizing the uniformly mixed material to obtain green pellets; c, drying: drying the green pellets; d, magnetization roasting: carrying out magnetization roasting of the dried green pellets at the temperature of 1000 DEG C-1200 DEG C to obtain magnetized pellets; and e, protective cooling: carrying out protective cooling of the magnetized pellets or carrying out hot delivery and hot charging into the gas-based shaft furnace for direct reduction. The preparation method has simple process steps, requires a few devices, and can meet needs of industrial production. The pellets obtained by the method can effectively eliminate catastrophic expansion of vanadium-titanium-iron concentrate pellets, play roles of restraining pulverization and bonding and improving desulfurization effect, and meet smelting requirements of the shaft furnace and a blast furnace.

Description

technical field [0001] The invention relates to the technical field of pellet preparation technology, in particular to a method for preparing magnetized pellets of vanadium-titanium-iron concentrate for shaft furnaces. Background technique [0002] Panzhihua vanadium-titanium magnetite is a compound ore mainly containing titanium, iron, vanadium and a small amount of chromium, nickel, cobalt, platinum group, gallium, scandium and other elements. The reserves of vanadium-titanium magnetite in Panxi area are more than 20 billion tons, accounting for more than 30% of the national iron ore reserves. Among them, the reserves of titanium resources are 870 million tons, accounting for 90.5% of the national reserves of titanium resources and 35.2% of the world's titanium reserves. In addition, there are 900,000 tons of cobalt, 700,000 tons of nickel, 250,000 tons of scandium, 180,000 tons of gallium, and a large amount of chromium, copper, sulfur and other resources. [0003] Vana...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/242C22B1/02
Inventor 杨绍利赵劲涛曾扬州赵有琴
Owner 云霄县食品快检中心
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