Analysis of the silicon-containing iron ore beneficiation process!

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Most of my country's iron ores are lean ores with high content of impurities such as silicate, making beneficiation difficult. Therefore, silicon removal and purification of iron ore is the main issue of mineral processing at present. This article takes a certain silicon-containing iron ore as an example to introduce its process flow.

1. Properties of silicon-containing iron ore

This iron ore is a typical lean Magnetite ore has the characteristics of low grade, very fine particle size, high silica content, and complex composition. It is a relatively difficult ore to be selected among magnetite ores.

The structure of the ore mainly includes disseminated structure, striped structure, massive structure and brecciated structure. The structure of the ore mainly includes fine-grained structure, other-shaped crystal structure, euhedral crystal structure, semi-euhedral crystal structure, etc. The relationship between the iron minerals in the ore is complex. There are many kinds of iron minerals in the ore. The main useful iron mineral is magnetite, followed by hematite and limonite. Gangue minerals are mainly quartz, followed by calcite, chlorite, actinolite, feldspar, clay minerals, etc.

II. Silicon-containing iron ore beneficiation process

This kind of primary iron ore only adopts conventional magnetic separation process, and it is difficult to obtain high iron grade and recovery rate. Iron ore concentrate with low silica content. Therefore, it is necessary to design a suitable process plan through ore processing test analysis. Finally, the concentrator adopts the stage grinding stage separation process to complete the separation and purification.

1. Stage grinding process

Use rod mill for the grinding stage. The ore concentration is 50%, the grinding particle size in one stage is -0.074mm, which accounts for 40%, and the coarse concentrate re-grinding particle size is -0.038mm, which accounts for 85%.

2. Stage separation process

The separation process mainly adoptsone-stage magnetic separation-rough Concentrate regrinding - two stages of magnetic separation - one coarse and three refined reverse flotation processes, the grinding particle size of the raw ore is -0.074 mm, accounting for 40%, Under the condition of magnetic field intensity of 92 kA/m, use Electromagnetic drum to conduct a section of weak magnetic separator Magnetic separation, the second stage magnetic separation field strength is 76 kA/m, the third stage magnetic separation field strength is 60 kA/m; reverse flotation pH = 9.0, the dosage of chemicals is rough selection, quantitative starch, ether amine, No. 11 oil, etc. are completed in the first stage Selection; quantitative etheramine and No. 11 oil are used to complete the second stage of selection; the third stage of selection does not add any medicine.

Finally, the iron concentrate obtained has a full iron grade of 65.37% and a silica content of 4.26% , the iron recovery rate of the entire ore dressing process is 58.92%, and the iron concentrate yield is 25.78%, achieving good indicators.

The above is an introduction to the process of a certain silicon-containing iron ore beneficiation process. In the actual mineral processing plant, impurities in the iron ore There are many ores and complex ones, so it is recommended to conduct ore dressing test analysis first, and then design a suitable iron ore beneficiation process plan through analysis.