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Click to add WeChatIron tailings recycling is an important method to reduce the hazards of tailings. Not only can it reduce the use of iron tailings ponds or reduce the area occupied by tailings ponds, but it can also effectively solve the various hazards of tailings piles. At present, the common methods for recycling iron tailings mainly include tailings re-selection, tailings dry discharge, tailings backfill and Tailings to make other materialsSeveral ways.
Due to the backwardness of mineral processing technology and the gap in ideological cognition in the early stage, As a result, the recovery rate of iron is poor, and more useful iron minerals are left in the tailings. In addition to a small amount of metal components, this part of the minerals also contains some gangue minerals. This has resulted in insufficient comprehensive utilization of a large number of mineral resources. In order to improve the utilization of iron ore and other mineral resources, useful minerals can be recovered through iron tailings reprocessing.
According to the different properties of iron ore tailings, commonly used tailings re-selection methods include magnetic separation, flotation and gravity. Combined beneficiation method composed of magnetic and flotation componentsetc.
1. Magnetic separation of iron tailings: The iron in some iron tailings occurs in magnetite or weakly magnetic hematite and limonite minerals, gangue Minerals are not magnetic (such as quartz, calcite, etc.). There is a magnetic difference between the two, so the separation can be completed through the magnetic separation process.
2. Iron tailings flotation and re-selection: The flotation method separates iron tailings, which is generally suitable for separating fine particles or fine particles that are difficult to be separated by magnetic separation. Magnetic iron minerals. Taking advantage of the different surface properties of ores, mineral selection is achieved by adding chemicals.
3. Combined re-selection of tailings:Combined re-selection of iron ore tailings generally adopts gravity separation, It is a combined process of magnetic separation and flotation. Among them, gravity separation is mainly used as a pre-selection and enrichment operation (it can also play a desliming role) to improve the grade of minerals for magnetic separation; flotation is used as a supplementary separation operation, mainly capturing and collecting The continuous organisms that cannot be recovered in the magnetic separation stage can improve the recovery rate of the entire mineral processing operation.
In the early days, wet discharge of iron ore tailings was mostly used, which not only occupied a large amount of land, but also retained some heavy metals in the iron tailings. Hazardous substances, and the accumulation of tailings will seriously affect the surrounding ecological environment. In addition, if a dam breaks, it will also cause casualties in surrounding areas, deforestation and farmland destruction, etc. Through tailings dry discharge, the wet tailings can be concentrated and dehydrated, and the water content can be reduced before being sent to the tailings pond for dry storage or secondary use to produce related materials.
The iron tailings slurry is sent to the cyclone by the delivery pump for concentration and classification , in which the settled sand enters the high-frequency dehydration screen to continue dehydration treatment, and the overflow enters the high-efficiency concentrator for concentration treatment. The tailings dehydrated by the high-frequency dehydration screen is sent to the tailings storage by the belt conveyor, and the tailings slag processed by the thickener is pumped to the press to continue dehydration, and finally the tailings slag with very low water content is sent to the tailings pond for storage. In addition, different tailings dry discharge operations can be carried out according to the water content requirements of iron tailings.
Most of the iron ore mining in my country is underground mining. After the minerals are mined, voids are left behind, which poses great safety risks. , so the void area can be backfilled with tailings waste residue, which can effectively improve mine safety and reduce tailings storage capacity and tailings safety hazards.
Iron tailings contain more useful elements such as silicon, potassium, and sodium. These elements are used to make glass-ceramics or other glasses. of raw materials. In addition, it can also be used in paving materials, fired bricks, cement, soil conditioners and trace element fertilizers.
The above is an introduction to 4 types of iron tailings recycling methods. The choice of each method needs to be based on the properties of the iron tailings. When the iron ore in the tailings can reach the recovery value, that is It can be re-sorted. In addition, the production of other useful materials from iron tailings can also realize the return of funds, effectively reducing the investment budget of the concentrator.
Xinhai Mining can conduct ore analysis for various tailings minerals. If re-selection is possible, it can also design a tailings re-selection process plan and provide a complete set of tailings re-selection equipment based on the properties of the ore. If you have any needs, welcome to consult.
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