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Separation-smelting combined method for producing iron ore concentrate from oolitic lean hematite

A combination of beneficiation and smelting, hematite technology, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve problems such as difficult to obtain results, difficult to meet the requirements of flotation iron concentrate grade, and inability to obtain iron concentrate , to achieve the effects of low sulfur content, good technical and economic indicators, and high iron grade

Inactive Publication Date: 2010-10-20
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

But for such refractory ores, the single beneficiation method cannot obtain high-grade iron ore concentrate (iron grade above 60%), and it is feasible to remove impurities such as phosphorus, sulfur, and silicon in the ore by flotation , but the grade of flotation iron concentrate is difficult to meet the requirements; for metallurgical methods, whether it is direct reduction or reduction roasting, it is difficult to obtain good results for lean iron ore

Method used

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  • Separation-smelting combined method for producing iron ore concentrate from oolitic lean hematite

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Experimental program
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Effect test

Embodiment 1

[0014] Oolitic lean hematite (raw ore sample): TFe: 31.40%, P: 0.12%, S: 0.05%, SiO 2 : 23.91%, CaO: 5.23%, MgO: 1.86%. (mass percentage, the same below)

[0015] Firstly, the ore is crushed and ground, wet ground to -200 mesh content of 79.6%, the ore pulp after grinding enters the strong magnetic separator for pre-selection under the magnetic field strength of 780kA / m, the magnetic minerals enter the strong magnetic concentrate, and the non-magnetic minerals enter the tailings Mine, the tailings are removed in advance; the strong magnetic separation concentrate is mixed with coal powder, the weight of coal powder accounts for 15% of the concentrate weight, heated to 950°C in a muffle furnace, and kept for 1.5h for magnetization roasting; magnetization roasting ore After the sample is cooled, it is re-grinded. Wet grinding to -200 mesh accounts for 82.5%. ore, and become the final high-quality iron ore concentrate product.

[0016] The results of this embodiment are: the c...

Embodiment 2

[0018] Oolitic lean hematite (raw ore sample): Tfe: 30.80%, P: 0.14%, S: 0.08%, SiO 2 : 22.45%, CaO: 5.96%, MgO: 1.93%.

[0019] Firstly carry out crushing and grinding, wet grinding to -200 mesh content 81.50%, the ore pulp after grinding enters the strong magnetic separator for pre-selection under the magnetic field strength of 820kA / m, the magnetic minerals enter the strong magnetic concentrate, and the non-magnetic minerals enter the tailings Mine, remove tailings in advance; strong magnetic separation concentrate is mixed with coal powder, the weight of coal powder accounts for 20% of the concentrate weight, heated to 1000 ° C in a muffle furnace, and kept for 2 hours for magnetization roasting; magnetization roasting ore sample Regrind after cooling, wet grinding to -200 mesh accounts for 84%, and feed it to the weak magnetic separator after pulp adjustment, and carry out weak magnetic separation under the field strength of 230kA / m, and the magnetic minerals enter the we...

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Abstract

The invention relates to a separation-smelting combined method for producing iron ore concentrate from oolitic lean hematite. The technical scheme first comminutes oolitic lean hematite containing 30 to 40 percent of iron, the comminuted mineral slurry enters a high-intensity magnetic separator and preseparated, weak-magnetic mineral is turned into strong-magnetic concentrate, and tailings are removed in advance; the strong-magnetic concentrate is mixed with pulverized coal, the weight of which accounts for 10 to 30 percent of the weight of the concentrate, and the mixture is heated to 900 DEG C to 1100 DEG C in a muffle furnace, and is magnetically roasted as the temperature is kept for 1 to 3 hours; after being cooled, the magnetically roasted mineral sample is wet-milled, and is then fed into a low-intensity magnetic separator and separated under low-intensity magnetism, magnetic mineral is turned into weak-magnetic concentrate, and thereby high-quality iron concentrate is produced. The grade of the obtained iron concentrate is higher than 64 percent, the phosphor content is less than 0.15 percent, and the sulfur content is less than 0.10 percent. The invention is characterized by simple process flow, good technical and economic indexes and high product quality.

Description

technical field [0001] The invention relates to a method for combining mineral dressing and metallurgy, in particular to a combined dressing and metallurgy method for producing iron concentrate from oolitic lean hematite ore. Background technique [0002] Iron is the earliest discovered, most widely used, and most used metal element in the world, and its consumption accounts for about 95% of the total metal consumption. Iron is extracted from iron ore, both hematite and magnetite are common iron ores. Oolitic hematite is a kind of hematite, which is mainly distributed in Hubei, Hunan, Guizhou and other places in my country. Its reserves account for about 1 / 3 of my country's hematite reserves and 1 / 3 of the total iron ore resources. 9 or so. However, oolitic hematite has extremely fine particle size and is often symbiotic or wrapped with siderite, oolitic chlorite and phosphorus-containing minerals. Therefore, oolitic hematite is currently recognized as the most difficult ir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C1/30
Inventor 刘殿文文书明张文彬柏少军方建军章晓林谢海云孙力军陈禄正刘丹
Owner KUNMING UNIV OF SCI & TECH
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