Review: separation operation of mineral raw materials after crushing job last in wins the job, the separation of valuable minerals and gangue, separated from each other or make a variety of useful minerals. This is the main part of dressing. -Separation operation of gravity separation, flotation. Washing to avoid the mud mud blocked in the mineral raw material crushing and screening equipment, require washing. Raw materials containing soluble useful or harmful ingredients, but also for washing. Washing can be carried out in the washing machine, and can also be made in the screening and classification equipment.
1867 leitinggeer (P.R.von Rit-tinger) with the science of dressing, initially forming processing system.
1903 (R.H.Richards) with the dressing, constituting a separate processing engineering.
1933 liebinjieer (.. EEP) with the physical chemistry of flotation process, 1939
Selected mineral raw material preparation before job grinding, beneficiation process consists of dissociation and separation of two basic parts.
Mechanical dressing plant in in the 1920 of the 20th century, China. After 1949, the metallurgical performance, capacity and processing science and technology have greatly developed. Tungsten, Tin and other mineral processing technology in some ways have higher levels and create unique centrifugal separator, runout chute, new equipment, such as ring type flotation machine, and the first by a separation-flotation method to recover the copper oxide. Separation operation of mineral raw materials after crushing job last in wins the job, the separation of valuable minerals and gangue, separated from each other or make a variety of useful minerals. This is the main part of dressing. -Separation operation of gravity separation, flotation.
Washing to avoid the mud mud blocked in the mineral raw material crushing and screening equipment, require washing. Raw materials containing soluble useful or harmful ingredients, but also for washing. Washing can be carried out in the washing machine, and can also be made in the screening and classification equipment.
Screening and classification according to the screen size of the mesh material is divided into different levels of granularity and screening, often used in the processing of coarse grain size of materials. According to the particles in the medium (usually water) sedimentation velocity in different material is divided into different reduction levels, graded for particle size smaller items. Screening and classification is in the process of crushing sort out suitable granular material, or material into
Selected for different granularity levels.
Grinding with grinding and impact. Will break ground to size the size of 10~300 μ m. Grinding grain size according to the useful role of mineral ore particle size and sorting methods to determine. Grinding equipment are commonly used: Rod mill, ball mill, grinding machine and semi-automatic grinding machine. Grinding operation energy consumption is high, usually about half of the total energy consumption of mineral processing. 80 application of new lining and other measures, higher grinding efficiency, energy consumption has declined.
Breaking mine out size for 500~1500mm block fragmentation up to size for the 5~25mm process. Crushed, crushed, split up, and General rough broken, broken, broken bits in three segments.
Mineral processing and separation technology
Chemical properties of minerals are different, with chemical or chemical and physical separation and recycling useful ingredients combined to get chemical concentrates. This approach is better than the usual physical beneficiation method adaptable, good separating effect, high cost, often used to physical beneficiation method used for treatment difficult or not processing of mineral raw materials, intermediate products or tailings. As components of complex and refractory and fine mineral raw materials increasing combined physical and chemical mineral processing flow is more and more attention. Chemical selected examples of successful application of cyanide gold extraction and acid leaching-precipitation-flotation, separation-flotation of oxide copper ore and so on.
Includes hand-selected and mechanical picking. Mainly used for lost preselection in addition to waste rock. Hand selected based on external characteristics of mineral and artificial selection. This ancient method, some mines still apply. Machinery chosen are: ① selection of optical characteristics of mineral dressing; II x-ray selection under x ray irradiation, using fluoresce characteristics separating c radiation chosen, using the natural radioactivity of minerals such as uranium, thorium separation. 70 's began to use mineral conductivity or magnetic electrical and magnetic chosen selection.
Difference of mineral particles, sorting in a high voltage electric field. Mainly used for separation of conductors, semiconductors and non-conductive mineral. Electric separator can be classified by the electric field of electrostatic separator, Corona processing machine and the electric separator; according to the particle charge methods can be divided into contact with live electric separator, Corona charged electric separator and friction-charged electrostatic separator. Electric separator size range is narrow, processing capacity, and raw materials by drying and therefore has limited application, but cost is not high, good separation effect, pollute less; mainly used for coarse and fine featured, such as separation of scheelite, cassiterite, zircon, rutile, ilmenite, tantalum niobium, monazite, and so on. Electrostatic separation is also used for classification of fossil raw materials and dust removal. Selected trend is the development of large capacity, sorting fine material high efficiency equipment.
Magnetic separation mineral particle magnetic differences, separation in the inhomogeneous magnetic field. Strongly magnetic mineral (magnetite and pyrrhotite) with a weak magnetic field magnetic separator for separation; weakly magnetic minerals (Hematite, siderite, ilmenite, wolframite, etc) with a strong magnetic field magnetic separator for separation. Weak magnetic field magnetic separator is mainly open magnetic system, formed by permanent magnets, magnetic magnetic separator for closed-circuit magnetic system, using electromagnetic magnetic system. Weakly magnetic iron ore magnetizing roasting can also be turned into strong magnetic minerals, and weak magnetic field magnetic separator for separation. Structure of magnetic separator drum, belt, swivel-type, disc type, such as sensing roll. Magnetic pulleys for primary massive strong magnetic minerals. Solution is the main trend of magnetic separation of fine weakly magnetic minerals recycling problem. 60 invention toothed plate magnetic media Jones wet high-intensity magnetic separator, contributed to the xuanshou of the weakly magnetic minerals. The 70, steel wool or steel mesh for magnetic media with high magnetic field gradient and intensity of high gradient magnetic separator and use low temperature superconductors to replace room temperature conductor of superconducting magnetic separators, for recovery of fine weakly magnetic minerals with good prospects.
Using a variety of mineral particle surface wettability of water (hydrophobic or hydrophilic) differences in sorting. Usually refers to a froth flotation. Less natural hydrophobic mineral, often added to the pulp collector, emerge to enhance the minerals hydrophobic; adding various modifiers to increase selectivity; join the Frother and inflatable bubble, hydrophobic mineral particles attached to the bubbles, float separation. Flotation is usually capable of handling less than 0.2~0.3mm material, separation in principle all kinds of mineral raw materials, is one of the most widely used method. Flotation can also be used in smelting products, the ions in solution (see) and the treatment of waste water. Flotation in addition to large flotation machines, micro-materials recycling (less than 5~10m) some of the new methods. For example selective flocculation gel-floating selected, with flocculation gel agent has select to makes a species micro-grain material formed size larger of flocculation mission, then with floating selected (or off mud) method separation; shear flocculation gel-floating selected, added catching received agent, Hou high strength mixing, makes micro-grain mineral formed flocculation mission again floating selected, and the carrier floating selected, and oil reunion floating selected,.
Medium (mostly water) stream using different separation of mineral raw material particle. , Jigging, Shaker, chute selection selected, and so on. Gravity concentration is flotation of wolframite, cassiterite, gold, coarse grained iron and manganese ores of the main mineral processing method is widely used in sorting metals Placer. Re-election of applicable size range, from hundreds of mm to mm, mineral processing low cost and less environmental pollution. Mineral particle size in the range and large density difference between the components, use the re-election of the most suitable. Sometimes available for re-election (mostly dense medium separation, jigging) preselection to remove some waste rock, and otherwise processing to reduce processing costs. With the increase of lean ore, fine minerals, gravity separation equipment of large-scale, multi-, and the use of complex equipment, such as centrifugal concentrator, shaking beds, runout chute in order to improve the efficiency of fine material for re-election. Re-election has been more effective in sorting items 20 μ m. Gravity is the main method of coal. In addition, mineral raw materials in inclined plane movements or collisions using the coefficient of friction, collision recovery factor of separation after the product processing operation includes concentrates, intermediate products, tailings dehydration, impoundment and waste water treatment. Dressing primarily in the water, after the product needs. Gravity discharge, concentration, filtration and drying. Massive and coarse material dewatering screen, spiral classifier and dehydration example for gravity discharge. Fine materials with concentrated or hydrocyclone and magnetic dewatering cell concentration, and vacuum filter. 70 developed continuous automatic filter presses, can further reduce the moisture content. Can also add flocculants and filter aid, to speed up the fine material thickening and filtration efficiency. Drying filter cake when necessary. Appears Fluidization drying and spray drying method and drying efficiency is increased. Usually given by the tailings from tailings storage, sometimes by the concentration of a storage. Waste water can be recycled. Not subject to purification of waste water emission standards.
Boiling type flotation machine flotation increase selected
Select products: for all the best control.