Beneficiation method for reducing content of SiO2 in magnetite concentrate

Abstract

The invention discloses a method for reducing SiO in magnetite concentrate ₂ The beneficiation method adopts the following process: 1) Anion reverse flotation of high-silicon magnetite concentrate to obtain TFe≥68.75%, SiO ₂ High-quality low-silicon ferrosilicon concentrate C with content <3.0% ₁ , and discharge anion reverse flotation tailings; 2) anion reverse flotation tailings pre-classification-regrinding-weak magnetic separation to obtain weak magnetic separation concentrates; 3) weak magnetic separation magnetic re-separation concentrates to further obtain TFe≥ 62.5%% Magnetic Gravity Separation Iron Concentrate C ₂ . The invention has the advantages of high grade iron concentrate, SiO ₂ It has the advantages of low content, high iron recovery rate, small loss of fine-grained iron minerals, low energy consumption for beneficiation, stable indicators, and easy operation and management on site.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, in particular to a beneficiation method for increasing iron and reducing silicon from magnetite, in particular to further reducing SiO in magnetite concentrate 2 The beneficiation method is especially suitable for magnetite concentrate grade 65.0%-66.5%, SiO 2 Iron and silicon reduction beneficiation of high-silicon magnetite concentrate with a content of 6.0%-8.0%. Background technique [0002] In my country's iron ore concentrate output, it is mainly magnetite concentrate, whose grade is generally 65-66%, SiO 2 Content 6-7%. In order to realize the "concentrated material guideline" of blast furnace charge and realize energy saving and high efficiency in blast furnace ironmaking, it is necessary to further reduce SiO in iron concentrate 2 content. [0003] Magnetite concentrate commonly used to reduce SiO 2 The beneficiation technology of content mainly includes weak magnetic...

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Problems solved by technology

[0005] Its disadvantages are: ①The processing capacity is small, the number of equipment is large, the screen wears quickly, and the operation and management requirements are relatively strict; The hole size is 0.076mm, and the ore embedded with finer particle size has no industrial production practice using this process

[0007] Its disadvantages are: ①The magnetic separation column has small processing capacity, large water consumption, and difficult operation; ②Although it occupies a small area, it occupies a large space and requires a high configuration height

[0008] Weak magnetic separation-reverse flotation process (process 3) itself has the advantages of mature technology, stable indicators, simple operation, and suitable for processing fine-grained ore, but its disadvantage is that it can reduce the concentration of SiO in magnetite concentrate. 2 When the content is low, the iron grade of the flotation tailings is too high, resulting in low recovery of iron concentrate

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