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Method for removing silicon impurities in iron ore concentrate to improve grade of iron

A technology for removing iron and iron grade is applied in the field of removing silicon impurities in iron concentrate to improve iron grade, and can solve the problems of unsatisfactory removal of silicon impurities, unsatisfactory effect, and increased pollution, and achieves low cost and energy consumption. The effect of less and simple production process

Inactive Publication Date: 2014-05-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But want to get SiO 2 Iron concentrates with low content require repeated screening by multiple processes, resulting in higher costs and increased pollution, and these traditional physical and chemical methods are not ideal when dealing with low-grade iron ores
Nowadays, there is no simple and effective way to deal with silicate minerals in iron ore in the field of mineral processing technology
Especially for the magnetized roasted iron slag, the ore crystal is not easy to damage under the microcosm, so that during the magnetic separation of the magnetized roasted iron slag, due to Fe 3 o 4 Still tightly bound to silicate minerals, resulting in suboptimal removal of silicon impurities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Crush and grind the magnetized roasted iron slag after pyrite acid production to 10mm;

[0016] (2) Add 100ml of the prepared silicate bacteria nitrogen-containing medium into a 250ml Erlenmeyer flask. The composition of the nitrogen-containing medium is: 3g of sucrose, Na 2 HPO 4 2g, MgSO 4 ·7H 2 O 0.5, (NH 4 ) 2 SO 4 1.5g, CaCO 3 0.1g, 1g bauxite, 1L single distilled water, pH value is 5, FeCl 3 FeCl with a mass volume ratio of 0.01g / ml to single distilled water 3 Solution 2ml, put the medium in a sterilizing pot at 121°C, and sterilize for 20 minutes;

[0017] (3) After the culture medium is cooled, transfer the culture bottle to a sterile bench, and after 25 minutes of ultraviolet sterilization, inoculate Bacillus circulans with an inoculation amount of 1%, place it on a constant temperature shaker at 30°C at 160rpm for 1 day, and then transfer it again , the inoculation amount was 1%, and the activated bacteria were transferred twice;

[0018] (4) ...

Embodiment 2

[0023] (1) Crush and grind the limonite to a particle size of 20mm.

[0024] (2) Add 100ml of the prepared silicate bacteria nitrogen-containing medium into a 250ml Erlenmeyer flask. The composition of the nitrogen-containing medium is: 4g of sucrose, Na 2 HPO 4 4g, MgSO 4 7H 2 O 0.7g, (NH 4 ) 2 SO 4 2.6g, CaCO 3 0.2g, 1g bauxite, 1L single distilled water, pH 6, FeCl 3 FeCl with a mass volume ratio of 0.01g / ml to single distilled water 3 Solution 2ml, put the culture medium in a sterilizing pot at 121°C, and sterilize for 20 minutes.

[0025] (3) After the culture medium is cooled down, transfer the culture bottle to a sterile bench, and after 25 minutes of ultraviolet sterilization, inoculate Acinetobacter with an inoculation volume of 1%, place it on a 30°C constant temperature shaker at 180rpm for 1 day, and then transfer it again. The inoculation volume was 1%, and the activated bacteria were transferred twice.

[0026] (4) Inoculate the Acinetobacter cultured ...

Embodiment 3

[0031] (1) Crush and grind the magnetized roasted iron slag after sulfuric acid production to 50mm.

[0032] (2) Add 100ml of the prepared silicate bacteria nitrogen-containing medium into a 250ml Erlenmeyer flask. The composition of the nitrogen-containing medium is: 5g of sucrose, Na 2 HPO 4 5g, MgSO 4 7H 2 O 1g, (NH 4 ) 2 SO 4 3.8g, CaCO 3 0.3g, 1g bauxite, 1L single distilled water, pH value is 7, FeCl 3 FeCl with a mass volume ratio of 0.01g / ml to single distilled water 3 Solution 2ml, put the culture medium in a sterilizing pot at 121°C, and sterilize for 20 minutes.

[0033] (3) After the culture medium is cooled, transfer the culture bottle to a sterile bench, and after 25 minutes of ultraviolet sterilization, inoculate Acinetobacter and Methylobacterium with an inoculation amount of 1%, and place it on a constant temperature shaker at 30°C at 200rpm for 1 day after activation. Transplanted once, the inoculation amount was 1%, and activated bacteria were tran...

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PUM

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Abstract

The invention relates to a method for removing silicon impurities in iron ore concentrate to improve the grade of iron. The method comprises the following steps of (1) treating iron ore, namely, crushing magnetite or magnetized and roasted iron slag in an acid making process, and grinding till the size is 10-55mm; (2) carrying out activated and habituated culture of high-efficiency desiliconizing bacterium; (3) carrying out biological pretreatment of iron ore, namely, in a culture medium with the mass-volume ratio of the iron ore to the nitrogen-containing culture medium being 0.15-0.40g / ml, inoculating habituated silicate bacteria solution in the step (2) with the final inoculating concentration being 106-108g / ml, and culturing for 12-34 hours under the condition that the pH value is 5-7 and the temperature is 25-35 DEG C; and (4) preparing iron ore concentrate. The method has the advantages of low cost, less energy consumption, simple production process and environmental-friendly effect and the like.

Description

technical field [0001] The invention relates to a method for removing silicon impurities in iron concentrates and improving iron grades. Background technique [0002] Compared with Sweden, Australia, Brazil and other countries, SiO in my country's iron concentrate 2 The iron content of the sintered ore is too high, resulting in only 53% to 56% of the iron grade of the sintered ore, which affects the improvement of the utilization factor of the blast furnace. In addition, most of the gangue components of iron ore are acidic, SiO 2 The content is higher. Under modern blast furnace smelting conditions, in order to obtain slag with a certain alkalinity, a certain amount of basic flux (limestone) and SiO must be added to the charge. 2 The role of slag. SiO in iron ore 2 The higher the content, the more limestone needs to be added, and the more slag will be generated, which will increase the coke ratio and reduce the output. Therefore, it is required that the iron ore conta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00
Inventor 贺治国王龙
Owner CENT SOUTH UNIV
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