Ore dressing process of oolitic high phosphorus hematite

A beneficiation method and hematite technology, applied in chemical instruments and methods, flotation, wet separation, etc., can solve problems such as complex sorting process, difficult to effectively sort, ore muddying

Inactive Publication Date: 2007-03-21
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, it is easy to cause muddying of the ore, and it is difficult for the conventional beneficiation method to effectively separate the particularly fine ore pulp.
If impurity phosphorus is added to oolitic hematite, the sorting process will be more complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A beneficiation method for oolitic high-phosphorus hematite. The chemical composition of oolitic high phosphorus hematite is: TFe is 45.5wt%, FeO is 0.27wt%, P is 0.87wt%, SiO 2 22.08wt%, Al 2 o 3 5.2 wt%, CaO 2.01 wt%, and MgO 0.15 wt%.

[0017] The technical proposal is: put 95-97% oolitic high-phosphorus hematite with a particle size of less than 15mm after crushing and 3-5% reducing agent coal powder into a shaft furnace or a rotary kiln for roasting according to the percentage by weight. The heating method is gas. The calcination temperature is 800-1050°C, the calcination time is 0.5-1.5h, and it is sealed and cooled to room temperature. Then the roasted ore is crushed and ground for weak magnetic separation. Then adjust the pH value of the coarse concentrate obtained by magnetic separation to 9-10, add 0.8-2.0 kg / t of iron ore inhibitor sulfonated corn starch, add lime 0.2-1.0 kg / t, and finally add rapeseed fatty acid 0.2-1.5 kg / t for reverse flotation.

[...

Embodiment 2

[0020] A beneficiation method for oolitic high-phosphorus hematite. The chemical composition of oolitic high phosphorus hematite is: TFe is 44.29wt%, FeO is 0.34wt%, P is 1.19wt%, SiO 2 31.21wt%, Al 2 o 3 is 5.84wt%, CaO is 2.66wt%, and MgO is 0.12wt%.

[0021] The technical proposal is: put 90-95% oolitic high-phosphorus hematite with a particle size of less than 10mm after crushing and 5-10% reducing agent coal powder into a shaft furnace or a rotary kiln for roasting according to the weight percentage. The heating method is bituminous coal. The calcination temperature is 800-1050°C, the calcination time is 1.0-2.5h, and it is sealed and cooled to room temperature. After crushing and grinding the roasted ore, carry out weak magnetic separation, then adjust the pH value of the coarse ore obtained by magnetic separation to 10-11, add 0.8-2.0 kg / t of iron ore inhibitor sulfonated wood starch, and add Calcium chloride 0.2-1.0kg / t, and finally add soybean fatty acid 0.2-1.5k...

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Abstract

The ore dressing process of oolitic high phosphorus hematite includes the following steps: roasting crushed oolitic high phosphorus hematite in 80-99 wt% with coal powder as reductant in 1-20 wt% inside a shaft furnace or rotary kiln at 700-1050 deg.c for 0.5-2.5 hr and sealed cooling to room temperature; crushing the roasted hematite, grinding and weak magnetic separation; regulating pH value of the coarse concentrate to 8-12, adding iron ore inhibitor sulfonated starch in 0.5-3.0 kg/ton, activator in 0.2-2.0kg/ton and collecting agent in 0.2-3.0kg/ton and final reverse floatation. The process converts the weak magnetic hematite into strong magnetic mineral, concentrates iron mineral via weak magnetic separation and eliminate P, Si and other impurities in reverse floatation, and can obtain iron concentrate with iron grade higher than 63 %, P content less than 0.15 %, and iron recovering rate over 75 %.

Description

technical field [0001] The invention belongs to the technical field of mineral processing engineering. In particular, it relates to a beneficiation method of oolitic high-phosphorus hematite Background technique [0002] Compared with other countries in the world, my country's iron ore resources have the characteristics of "poor, fine and miscellaneous". With the rapid development of the domestic iron and steel industry in recent years, the import of iron ore has continued to increase, which has driven the price of international iron ore to rise steadily, forcing domestic enterprises to turn their attention to the development of minerals that were previously considered "difficult to sort" use. [0003] Iron ore resources in foreign countries are relatively abundant, so there is little research on the sorting of ores with high phosphorus content and low-grade ore, and domestic research in this area is also very limited, and the results obtained are roughly as follows: [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03C1/005B03D1/004B03D101/06B03D101/02B03D103/04
Inventor 杨大兵
Owner WUHAN UNIV OF SCI & TECH
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