A method of strengthening the selective flocculation of fine-grained hematite

Abstract

The invention discloses a method for enhancing selective flocculation of micro-fine particle hematite. The method comprises the following steps: step one, firstly carrying out dry grinding of hematiteand controlling the degree of dissociation of the hematite; step two, putting the dissociated hematite which meets the requirement in a magnetic field with adjustable magnetic field intensity, magnetizing the hematite from weak to strong, and changing the magnetic properties and the surface properties of the hematite; step three, preparing a high-activity flocculating agent; and step four, preparing the magnetized hematite into a solution and flocculating the solution, a dispersing agent and the high-activity flocculating agent in a same cavity by stirring all the particles of a hematite slurry via a stirring shaft at the beginning of flocculation, then regulating and controlling an external rotary magnetic field to further stir hematite particle groups for a second time, fully dispersingobjective particles and settling effective floccules. Through implementation of the four steps which are taken as key enhancement technological manners, the quality, the stability and the strength ofthe micro-fine particle floccules of the hematite are ensured; the foundation is laid for further flotation.

Description

technical field [0001] The invention relates to the field of mineral processing technology, in particular to a method for highly efficient flocculation of fine-grained hematite, in particular to a method for strengthening the selective flocculation of fine-grained hematite. Background technique [0002] Hematite has a relatively large resource reserve in my country, accounting for about 2 / 3 of iron ore resources, but there are few rich ore and easy-sorting resources. The total reserves of complex and difficult-to-use resources in my country are more than 20 billion tons. These iron ore resources are difficult to be directly used as raw materials for steelmaking and ironmaking. The characteristics of iron ore such as poor and fine impurities are becoming more and more obvious. It is difficult for conventional mineral processing technology to obtain ideal technical and economical conditions. Therefore, it is imperative to develop efficient and innovative hematite separation tech...

AI Technical Summary

Problems solved by technology

[0002] Hematite has a relatively large resource reserve in my country, accounting for about 2 / 3 of iron ore resources, but there are few rich ore and easy-sorting resources. The total reserves of complex and difficult-to-use resources in my country are more than 20 billion tons. These iron ore resources are difficult to be directly used as raw materials for steelmaking and ironmaking. The characteristics of iron ore such as poor and fine impurities are becoming more and more obvious. It is difficult for conventional mineral processing technology to obtain ideal technical and economical conditions. Therefore, it is imperative to develop efficient and innovative hematite separation technology to realize the separation and utilization of hematite in my country

[0003] Flotation is a common beneficiation method for fine-grained minerals, but this method needs to find a suitable flotation particle size and floatability. However, the particle size accumulation of fine-grained hematite is mostly lower than the lower limit of flotation, and the specific surface area of ​​fine particles is large. , high surface energy, high surface charge, large reagent consumption during sorting, low mineral sorting efficiency, conventional flotation methods are difficult to effectively sort

At the same time, the content of clay minerals in fine-grained hematite is high, and it is easy to adhere to the surface of hematite particles, which increases the difficulty of sorting

[0004] At present, the common treatment method for fine-grained hematite is to modify hematite through flocculation technology to meet the flotation requirements. flocculation, to reduce the impact of fine particles on flotation; ②Use physical or chemical methods to keep the particles in the slurry in a stable and uniform dispersion state; ③The effect of flocculation directly affects the various indicators of minerals after flotation, in order to ensure the effect of flocculation , a large amount of flocculant needs to be added, resulting in poor selectivity during flocculation, and it is easy to cause environmental pollution. When adding less flocculant, it will affect the strength of the floccules, which is poor and easy to disperse, and some hematite cannot be effectively agglomerated.

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