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Ore-dressing process by using carbon-contg. block to reduce lean iron ore for prodn. of magnetite

A technology for lean iron ore and magnetite, applied in the field of reduction beneficiation, can solve the problems that the standard of high-quality ore grade cannot be reached, the grade will not be greatly improved, and the energy consumption of high-temperature sintering is high, and the ability to achieve high grade improvement is strong. , low cost, low heating temperature effect

Inactive Publication Date: 2006-11-15
纪礽辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patented method has the following disadvantages: first, "water washing for enrichment" means sorting by gravity, and the grade will not be greatly improved; second, "the temperature is 1000-1200 ° C, and the time is 6-10 hours ", the energy consumption of long-term high-temperature sintering is too high, which increases the cost; third, "the grade of iron in the ore is not lower than 52%", which is still not up to the standard of high-quality ore grade; fourth, "suitable for small blast furnaces Ironmaking", now the country has banned the use of small blast furnaces

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Mix limonite with a grade of 45% and coal (kcal is 5000, volatile matter is 13) at a ratio of 20:3, then wet grind it to 70 mesh in a ball mill, and send it to a pelletizer after being dehydrated by a dehydrator An oblate ball with a diameter of 6 cm and a thickness of 2.5 cm was formed.

[0032] After drying, place it in a vertical kiln and heat it to 950°C for 20 minutes. After it is cooled, it will be finely ground to 100 mesh. Then it will be separated by a magnetic separator, and the selected iron powder will be sent to a sedimentation tank for precipitation.

Embodiment 2

[0034] Mix hematite with a grade of 43% and coal (5300 kcal, 17 volatile matter) at a ratio of 7:1, then wet grind it to 70 mesh in a ball mill, and send it to the brick making mechanism after being dehydrated by a dehydrator into bricks of 24cm×12cm×4cm. After drying, put it into a roller kiln for auxiliary heating to 1000°C for 15 minutes for self-reduction. After it is cooled by water, it is finely ground to 100 mesh, and then it is magnetically separated by a magnetic separator. The selected iron powder is sent to a sedimentation tank for precipitation.

Embodiment 3

[0036] The lean hematite ore and coal with a grade of 30-50% are crushed separately, placed in the mixer and mixed by stirring according to the weight ratio of lean hematite and coal at 5:1, and the mixed mineral powder and coal powder are sent into The honeycomb coal machine produces honeycomb briquettes. After the briquettes are naturally dried or dried, put the dried briquettes in a heating furnace at 500-700°C and heat them for 3-5 minutes. Grind to 100-200 mesh, and then go through magnetic separation with a magnetic separator to obtain finished iron fine powder with a grade as high as 60-66%.

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Abstract

A reductive ore dressing technology for preparing the magnetite concentrate from poor hematitie or poor limonite includes such steps as pulverizing said poor hematite or limonite and carbon contained substance, mixing, cold die pressing to obtain lumps, heating at 280-1200 deg.C for 3-100 min to reduce Fe2O3 to Fe3O4, water cooling, grinding and magnetic separation.

Description

technical field [0001] The invention relates to a reduction beneficiation method for producing magnetite from anthracite and limonite, which belongs to the technical field of iron and steel smelting. Background technique [0002] The main raw material for ironmaking blast furnaces is iron ore. According to the national industry standard, the iron content of iron ore should be more than 60% before it can be used as raw material for blast furnace ironmaking, so it is required to beneficiate the iron ore entering the blast furnace. With the rapid development of my country's economy, the demand for iron ore is increasing, but the mining of iron ore can no longer meet the needs of iron-making enterprises. Lean iron ore is mainly hematite or limonite, and its main component is Fe 2 o 3 , large reserves, low price, easy to mine, but because of low iron content, it is difficult to beneficiate and difficult to be used in blast furnace ironmaking. [0003] At present, the main ben...

Claims

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Application Information

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IPC IPC(8): B03C1/02B03C1/005
Inventor 纪礽辉
Owner 纪礽辉
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