First, the preparation of the sample The flotation test generally requires a particle size of less than l-3 mm, so the sample taken must be broken. Usually, it is crushed to a particle size of about 6.5 ram by a jaw crusher , and then crushed to the particle size required by the flotation test by a roller mill and a vibrating screen. The particle size can ensure the representativeness of the sample and is suitable for flotation. The ore size of the mill used in the test. The samples were then mixed and uniformly shrink into 500-1000 (individual low grade rare metal ore with up to 3000g) of a single aliquot, adapted for a test. In the preparation of the sample, it is necessary to prevent contamination of the sample, and avoid mixing of engine oil and other materials. For sulfide ore, to prevent oxidation, it is best to test immediately after preparing the sample. If the sample needs to be stored, it should be stored under a coarser particle size (6 ~ 25mm). Before the test, it will be broken into the required particle size, which can reduce the influence of oxidation. Second, the preparation of flotation reagents The amount of the agent prepared before the test should meet the requirements of the entire test. Keep the medicine in a dry, cool place. For easily decomposed and easily oxidized agents such as xanthate and sodium sulfide, it should be stored in a desiccator. Before using the drug, you must check whether it has deteriorated and understand the source of the drug. Third, the preparation of the grinding machine The laboratory should be equipped with several different sizes of grinding machines (such as p200mm × 200ram, 160m.I × l$0mm, 100mm × 150mm cylindrical grinding machine), these grinding machines can be used for grinding 500 ~ 1000g 200 to 500 g, 100 to 250 g of the sample. 240mm × 200mm cone type grinding machine, can grind 2000 ~ 3000g sample. Lab also preferably provided with a ceramic ball mill, if the test substance required to avoid iron contamination, this mill can be used. For mills that have not been used for a long time, the rust should be pre-ground with quartz sand or the sample studied before the test. Usually, it can be ground for a while before use. After washing the rust, start grinding the sample. After grinding, it must be filled with water and covered to prevent oxidation. Fourth, the preparation of the flotation machine Laboratory flotation machines are basically small-sized mechanical agitation flotation machines. The specifications of the single-slot flotation machine are 0.5L, 0.75L, 1.0L, 1.5L, and 3.0L. The tank of the hanging tank flotation machine is a suspended plexiglass tank with specifications ranging from 5 to 35 g to a maximum of 2000 g. Five, floating water After the general laboratory use of tap water in your area is to be tested, the main conditions to be determined, then the future beneficiation plant water use may be checked. When a fatty acid is used as a collector , in order to eliminate the adverse effect of calcium and magnesium ions on flotation, the hard water may be softened and then used. Sixth, other preparatory work In addition to the various main preparations mentioned above, the instruments and tools used in the flotation test, such as stopwatches, pH meters, measuring cylinders, pipettes, drug delivery syringes and needles, washing bottles, vials, and sized containers of varying sizes Wait, you need to prepare in advance and clean it.
Tube cutting machines are used for cutting long metal stock or scrap, generally where accuracy is not an important consideration, and the size or shape of the material makes other cutting or shearing options (such as a cutting torch) impractical. Alligator shears are often used in conjunction with large metal shredders in the metal recycling industry, to [clean" or prepare scrap for shredding by removing unwanted fittings and other parts the Shredder will not accept.
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