Reduction roasting-magnetic separation method for iron ore

A technology of iron ore roasting, which is applied in reduction roasting-magnetic separation of iron ore and reduction roasting-magnetic separation of low-grade vanadium-titanium magnetite. The effect of cost reduction

Active Publication Date: 2021-08-13
PANZHIHUA UNIV
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  • Abstract
  • Description
  • Claims
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high cost

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  • Reduction roasting-magnetic separation method for iron ore

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Embodiment 1

[0049] A, the vanadium-titanium magnetite produced in Panzhihua, the iron grade is 23.74%, and the main impurity components contain titanium dioxide mass percentage content of 12.47%, vanadium pentoxide mass percentage content of 0.493%, magnesium oxide mass percentage content of 3.85%, 0.03% by mass of cobalt, 1.68% by mass of calcium oxide, 0.67% by mass of sulfur, 0.018% by mass of nickel, and 0.014% by mass of phosphorus; to the crushing workshop. Jaw crusher is used for coarse crushing, the designed coarse crusher feed capacity is Qh=3000.0t / h, feed particle size is 1200-0mm, discharge particle size is 250-0mm, and loose density is 2.28t / m 3 , Design the ore discharge port e=250mm, design and select the production capacity: Q=4300t / h, the obtained coarse crushing products 220-250mm account for 80%.

[0050] Then finely grind and design the ore outlet e=50mm, and finely crush to obtain finely crushed products of 30-50mm, accounting for 80%.

[0051] B. Pre-throw tail

...

Embodiment 2

[0059] A, a kind of magnetite with an iron grade of 27.45% produced in Sichuan, the impurity components containing titanium dioxide mass percentage is 11.59%, vanadium pentoxide mass percentage is 0.375%, magnesium oxide mass percentage is 4.93 %, 0.02% by mass of cobalt, 1.47% by mass of calcium oxide, 0.73% by mass of sulfur, 0.015% by mass of nickel, and 0.019% by mass of phosphorus. workshop. First use the jaw crusher to coarsely crush it to -230mm, design the ore discharge port e=230mm, and obtain coarse crushed products of 220-230mm accounting for 80%; then finely crush it to -30mm, design the ore discharge port e=30mm, Finely crushed products of 30-50mm in size account for 80%.

[0060] B. Pre-throw tail

[0061] The finely crushed products are separated by a dry magnetic separator at a magnetic field strength of 33KA / m to obtain iron concentrate and non-metallic waste rock. High-grade iron ore concentrate II was obtained by magnetic separation under a magnetic field...

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Abstract

The invention relates to a reduction roasting-magnetic separation method for iron ore, in particular to a reduction roasting-magnetic separation method for low-grade vanadium titano-magnetite, which belongs to the technical field of mineral separation. The method comprises the steps that raw ore with the iron grade being 17.43%-28.59% is subjected to coarse crushing till the raw ore with the iron grade being 220-250 mm accounts for 80% or above, and then fine crushing till the raw ore with the iron grade being 30-50 mm accounts for 80% or above; waste rock and first concentrate are obtained through separation at the speed of 30-35 KA/m, the first concentrate is crushed to be 1-3 mm and accounts for 90% or above, magnetic separation is conducted at the speed of 115-125 KA/m, tailings are discarded, and second concentrate is obtained; the second concentrate, a reducing agent and a fluxing agent are mixed, roasted at 600-800 DEG C for 10-15 minutes, and cooled; and magnetic separation at 170-190 KA/m is then conducted to obtain iron ore concentrate. The magnetic separation efficiency is high, the iron recovery rate is high, the grade is greatly improved, and the resource value is maximized.

Description

technical field [0001] The invention relates to an iron ore reduction roasting-magnetic separation method, in particular to a reduction roasting-magnetic separation method of low-grade vanadium-titanium magnetite, which belongs to the technical field of mineral processing. Background technique [0002] With the rapid development of my country's economy, the iron and steel industry has made remarkable achievements. Although my country's iron ore reserves are abundant, ranking second in the world, most of them are low-grade vanadium-titanium magnetite that is difficult to smelt, and its average grade is often only about 34%, which is 15% lower than the world's average grade. Iron ore can no longer satisfy the rapidly developing steel industry, so my country has become the world's largest importer of iron ore, and its dependence on iron ore is as high as 70%. Therefore, it is urgent to improve the beneficiation process and improve the grade of iron ore. [0003] The current lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C1/00B03C1/015B03C1/005C22B1/02
CPCB03C1/00B03C1/015B03C1/005C22B1/02
Inventor 叶仕龙张士举徐玲俐徐珑滔邓玉芳唐艺珂
Owner PANZHIHUA UNIV
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