The structure of red mud particles is more complicated. Except for some single crystal minerals, they are mostly in the form of aggregates. The aggregates may be composed of the above various minerals. The chemical properties of iron-bearing minerals in red mud are partially unstable. For example, hematite may be converted to iron silicate after a period of storage, and similar phenomena occur in dust removal ash. The red mud contains a large amount of recyclable minerals/elements, especially the iron, titanium and antimony. The value of iron, titanium and antimony is higher. In the first time, the red mud contains aluminum, calcium and silicon, and the minerals with higher value are selected. After that, red mud can be used as building materials and cement raw materials. Beneficiation process red mud main magnetic separation, re-election, wet (acid leaching), wherein both the front main alternative for recovering iron from red mud, wet dressing mainly red mud recovered lean noble metal element, Such as bismuth, antimony , various types of rare earth elements. Magnetic separation is the main process for recovering various useful iron-bearing minerals in red mud. The iron in red mud is mainly hematite, followed by goethite and magnetite. Calcium iron ore and hydrated garnet also contain Part of the iron, but this part of the iron minerals has a low iron content and is not a target mineral for iron selection. According to the magnetic properties of useful iron-containing minerals in red mud, it is necessary to use a weak magnetic magnetic separator to recover magnetite, and a strong magnetic magnetic separator is used to select the red limonite. The magnetic separation operation of most red mud is wet magnetic separation. This is because the red mud is discharged in the form of a lower concentration of slurry, and only a small amount of coarse red mud can be used for dry magnetic separation. The particle size composition of red mud is mainly composed of fine particles. Some red mud-0.074mm content can reach more than 80%, and some red particles are contained in red mud. It can be known by analyzing red mud of different origins and different process genesis. As the red mud particle size becomes finer, the distribution rate of iron gradually decreases, and the higher content of fine red mud makes the viscosity of red mud increase. Iron-bearing minerals and other gangue minerals are prone to serious mechanical inclusions during sorting. Affect the concentrate grade. Under the condition that the distribution of iron-grained metal is suitable, the desliming operation before red mud magnetic separation is conducive to obtaining better beneficiation index. In addition to the aforementioned phenomenon of red mineral accumulation in red mud, the phenomenon of red mud is not obvious, and obvious continuous life can be seen only in the coarser red mud. The red mud magnetic separation process generally has a weak magnetic-strong magnetic process. Whether or not the grinding operation should be carried out depends on the continuous situation of the red mud. For red mud with a high content of fine particles, the concentration of magnetic separation should be as low as possible to form a good dispersion of iron-bearing minerals and gangue minerals in the slurry. The magnetic properties of iron-containing minerals in red mud are quite different, and the magnetic separation process may require different magnetic separation operations such as rough selection-selection-sweeping. The use of magnetization roasting and direct reduction followed by weak magnetic separation process can obtain concentrate products with high concentrate grade and high recovery rate, but the disadvantages are complicated equipment and long return on investment income. Lamp Die Casting Parts,Street Light Housing,Metal Housing For Led Lighting,Aluminium Led Lamp Housing Ningbo Zongchi Machinery Technology Co., LTD , https://www.zcdiecastservice.com
Application of magnetic separator in red mud selection
Red mud is all kinds of bauxite for alumina production waste residue produced after extracting aluminum, its exterior colors mostly red, earthy, hence the name. The main chemical components in red mud are aluminum oxide, silicon dioxide, ferric oxide and calcium oxide. In terms of its constituent minerals, it often contains calcite , vermiculite, diaspore, gibbsite, opal, Hydrated garnet, calcium stone, quartz , hematite, goethite, calcium iron ore, etc., as well as caustic soda and water glass mixed in the production of alumina.