Method for raising grade of hematite by biologically reducing and magnetizing and dressing

A technology for improving grades and hematite, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve problems such as environmental pollution, low indicators, high energy consumption, etc., and achieve short process, low cost, and simple process Effect

Inactive Publication Date: 2012-01-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the existing problems of high energy consumption, low index and serious environmental pollution in the processing of low-grade hematite in the prior art

Method used

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  • Method for raising grade of hematite by biologically reducing and magnetizing and dressing
  • Method for raising grade of hematite by biologically reducing and magnetizing and dressing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: The main chemical composition of a certain hematite is: TFe 28.82, P 0.35, S 0.028, C 0.96, SiO 2 48.64, Al 2 o 3 6.08, CaO 3.64, MgO 0.84, Na 2 O 0.24, K 2 O,0.27. Mineral composition: Metal minerals are mainly hematite, followed by limonite and siderite, and the content of other metal minerals is extremely low; gangue minerals are mainly quartz, clay minerals, muscovite, dolomite and a small amount of apatite .

[0026] Weigh 100g of the ore sample crushed to -2mm, and use a three-roller four-barrel rod mill to grind -200 mesh, accounting for 55%, and then pre-select the ground ore sample in a strong magnetic separator with a magnetic field strength of 1T. Magnetic minerals Enter the strong magnetic concentrate, non-magnetic minerals enter the tailings, and remove the tailings in advance;

[0027] The strong magnetic concentrate is re-grinded to -325 mesh, accounting for 75%, and then filtered;

[0028] Take 60mL of the dissimilation-reducing...

Embodiment 2

[0031] Example 2: The main chemical components of a certain high phosphorus oolitic hematite are: TFe 43.50, P 0.85, S 0.028, SiO 2 18.80, Al 2 o 3 6.67, CaO 3.66, MgO 0.67, MnO 0.17, K 2 O, 0.79. Mineral composition: The types of minerals are relatively simple. The iron minerals are mainly hematite, followed by limonite, and occasionally magnetite; the gangue minerals are mostly quartz, followed by oolitic chlorite, illite, and collophosite , dolomite, calcite and kaolinite.

[0032] Weigh 100g of the ore sample crushed to -2mm, and use a three-roller four-barrel rod mill to grind -200 mesh, accounting for 55%, and then pre-select the ground ore sample in a strong magnetic separator with a magnetic field strength of 1T. Magnetic minerals Enter the strong magnetic concentrate, non-magnetic minerals enter the tailings, and remove the tailings in advance;

[0033] The strong magnetic concentrate is re-grinded to -325 mesh, accounting for 75%, and then filtered;

...

Embodiment 3

[0038] Example 3: The main chemical composition of a kidney-shaped lean hematite is: TFe 29.28, P 0.09, S 0.07, SiO2 52.94, Al2O3 1.67, CaO 1.01, MgO 1.02, MnO 0.08. Mineral composition: The structure of the ore is relatively complex, mainly in the form of granular, plate-like, sheet-like, needle-like, columnar, scale-like and fibrous crystal structures. The structure is dominated by banded structures, followed by rubbish and breccia structures superimposed on the basis of banded structures; there are also a small amount of massive structures.

[0039] (1) Weigh 100g of the ore sample crushed to -2mm, and use a three-roller four-barrel rod mill to grind -200 mesh, accounting for 55%, and then pre-select the ground ore sample in a strong magnetic separator with a magnetic field strength of 1.2T. Magnetic minerals enter the strong magnetic concentrate, non-magnetic minerals enter the tailings, and the tailings are removed in advance;

[0040] The strong magnetic concentrate i...

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Abstract

The invention belongs to the field of dressing of black metals, and relates to a method for raising the grade of complex hematite which is difficult for dressing by reducing and magnetizing with microorganisms and dressing. A major process comprises ore grinding, forced magnetic dressing, reducing and magnetizing with microorganisms, and the like. The method is characterized by comprising the following steps of: feeding hematite of which the granularity is 0-4 millimeters into an ore mill for milling till hematite of -200 meshes accounts for 50-65 percent of all hematite; grading a ground ore sample with a high-gradient high intensity magnetic separator; feeding selected ore concentrate into the ore mill for milling to ore of less than -200 meshes; reducing and magnetizing with microorganisms by taking organic waste water as a culture medium; and selecting final ore concentration by performing high intensity magnetic separation, wherein the iron grade can be up to 55-70 percent, the recovery rate is over 70 percent, and the COD (Chemical Oxygen Demand) of the organic waste water is lowered remarkably. According to the method, complex hematite which is difficult for dressing can be fully recycled, and the product grade and the recovery rate are remarkably increased in comparison to those in the conventional high intensity magnetic separation process; and moreover, the energy consumption is low, and the method is environmentally-friendly.

Description

technical field [0001] The invention particularly relates to a method for improving the grade of complex refractory hematite through biological reduction, magnetization and ore dressing, which belongs to the technical field of mineral processing. Background technique [0002] In recent years, the rapid development of China's steel industry has led to a strong demand for iron ore. my country is rich in iron ore resources, but more than 97% are poor ore that are difficult to be directly utilized, and mining is difficult. From the perspective of natural abundance, the iron ore resources that have been identified in my country have an average grade of only 31-32%, and there are still tens of billions of tons of hematite or cinders that are complicated and difficult to handle due to the fine particle size embedded in them. The economy is worth $1 trillion. [0003] At present, a number of effective technologies have been developed for refractory iron ore, such as vertical ki...

Claims

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Application Information

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IPC IPC(8): B03C1/00B03C1/005
Inventor 冯雅丽李浩然杨志超
Owner UNIV OF SCI & TECH BEIJING
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