Are there large reserves of iron tailings? Improve the iron tailings re-selection process!

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According to relevant statistics, the average grade of iron tailings in my country is over 11%. Due to the extensive mining used in some early iron ores, a large amount of valuable iron was released into the tailings. Currently, the grade of iron tailings in my country exceeds 10%. Billions of tons, if recycled, will be a very valuable asset.

According to the different mineral properties of iron tailings, the tailings re-selection methods selected are also different. Generally speaking, magnetic separation, flotation and gravity separation are commonly used methods for iron re-selection. In addition Generally, iron tailings have the characteristics of fine particle size. If a certain process is used alone, the ideal iron concentrate may not be obtained. It needs to be achieved through several joint beneficiation processes. Let’s talk about iron tailings re-selection. process method.

1. Iron tailings magnetic separation and re-selection method

Magnetic materials may exist in some iron tailings Iron ore and weakly magnetic hematite and limonite minerals, while gangue minerals are mostly quartz, feldspar, calcite, etc. There are differences between the two types of minerals, so magnetic minerals can be recovered through magnetic separation methods.

Because iron tailings have fine particle size and few strong magnetic minerals, strong magnetic separation is often used to capture weak magnetic minerals in the re-selection process of iron tailings. The process is simple and generally adopts 2-3 stages of magnetic separation. , such as using high gradient magnetic separation method for pre-enrichment of magnetic minerals, and using it in conjunction with the shaking table process or centrifuge process of the gravity separation method to obtain iron concentrate or ilmenite concentrate.

2. Iron tailings flotation and re-selection method

Flotation is mainly based on the surface properties of minerals Different, the use of chemicals and mechanical adjustment can effectively separate useful minerals, which is one of the commonly used methods for re-selection of fine-grained iron tailings. It can be accomplished by several methods: anion forward flotation, anion reverse flotation, and cation reverse flotation.

The anion collectors are fatty acids (RA series and CY series); the cation collectors are primary amines such as dodecylamine and GE series cations.

3. Iron tailings gravity separation and re-selection method

Gravity separation is used in iron tailings reselection , spiral chute is commonly used for pre-throwing iron tailings operation, and the concentrate in the chute enters the regrinding system to improve the dissociation degree of the target mineral for subsequent separation; the shaking table is often used for re-selection of high-magnetic concentration concentrate, which can High-grade concentrate can be obtained, but the processing volume is small and the concentrate recovery rate will be low. It is often used in conjunction with a centrifuge and a strong magnetic separator, and is suitable for upgrading 35-45 grade iron sub-concentrates.

4. Combined re-selection method of iron tailings

When a single method cannot be used to obtain qualified iron concentrate grade, a combined method is required for separation, mainly including gravity separation- Magnetic separation-flotation combined method and magnetic separation-flotation combined method.

Gravity separation-magnetic separation-flotation combined method:Gravity separation is often used as a means of pre-enrichment to improve the grade of the ore entering the magnetic separation operation and pre-enrichment at the same time It can also play a role in desliming and improve the recovery rate of magnetic separation. Flotation is used as a supplementary method to capture conjoined organisms that cannot be recovered during the magnetic separation stage, thereby improving the recovery rate of the entire operation.

Magnetic separation-flotation combined method: Enrich iron minerals through magnetic separation to improve the efficiency of flotation. It can also achieve the effect of desliming and removing impurities and optimize the flotation environment.

The above is an introduction to the iron tailings re-selection method. In the actual concentrator, whether the iron tailings are optional, tests need to be carried out on the tailings to determine whether the iron content reaches the optional level. nature, according to the actual situation, designing a suitable iron tailings re-selection process plan and configuring suitable iron tailings re-selection equipment, which has been obtained Ideal iron ore concentrate product.