What should I pay attention to when graphite flotation?
Graphite natural floatability is very good, generally using flotation method, can be harvested with neutral oil. However, the following points should be noted in the flotation:
(1) First find out the type of graphite ore. Graphite ore is divided into flaky graphite ore and earthy graphite ore. The flaky graphite ore is characterized by scaly or leaf-like graphite, and the ore grade is not high, generally ranging from 3% to 5%, and the highest is not more than 20% to 25%. This type of graphite has good floatability. After flotation, the grade can reach more than 90%. Therefore, the ore grade can be mined from 2% to 3%. The flaky graphite has excellent properties and is generally used for the manufacture of high-grade carbon products. Earthy graphite is also known as cryptocrystalline graphite ore. The graphite crystal of this ore is small, generally less than 1 μm, the surface is earthy, lacks luster, and the industrial performance is inferior to scaly graphite. The ore grade of this graphite ore is relatively high, generally 60% to 80%, but the floatability is very poor. After flotation, the grade will not be significantly improved. Therefore, the ore grade with less than 65% grade is generally not mined. The grade is between 65% and 80%, and can be used after sorting. Therefore, for graphite ore, you should not only look at the level of the original ore grade, but should first clarify its type, and then decide whether it can adopt the flotation scheme.
(2) Pay attention to the protection of large scales during the selection process. Large scale graphite has a wide range of uses, low resources and high value, so care must be taken to protect large scales from being broken during production. Usually large scales refer to scaly graphite of +50 mesh, +80 mesh, +100 mesh. The measure to protect the large phosphorus tablets is to use multiple grinding and multiple sorting processes in the sorting process. The graphite dissociated from the monomer obtained by each grinding is selected in time. If the ore is ground to a very fine particle size, the large scales are destroyed. For example, China's large graphite mine Nanshu graphite mine, which uses a rough selection, a sweeping, four grinding, six selected processes, not only protects the large scales from damage, but also makes the concentrate grade 90%. .
(3) High requirements on product quality. Graphite products of high quality requirements, such as ordinary graphite flake required grade of 89% or more, graphite pencil grade requirements from 89% to 98%. Some electric carbon graphite requires a grade of 99%. In order to obtain high-grade graphite concentrate, in the graphite flotation, the number of selections is generally more.
The hydraulic filter is an indispensable auxiliary component for the hydraulic system. The function of the hydraulic filter is to remove solid contaminants from the working medium of the hydraulic system, keep the working medium clean, extend the life of the system components, and ensure the hydraulic components. Reliable performance.
Hydraulic Filters can be divided into: oil suction filter, pressure filter and oil return filter according to their use and installation location. According to different working pressures, it can be divided into: low pressure filter, medium pressure filter and high pressure filter.
The following aspects should be considered when selecting a filter:
1. Select the type of filter according to the purpose of use (use), and select the installation shape of the filter according to the installation position.
2, the filter should have a large enough oil-passing capacity, and the pressure loss is small
3, the filtration accuracy should meet the required cleanliness of the hydraulic system or components
4. The Filter Material used in the filter element should meet the requirements of the working medium used and have sufficient strength.
5. The strength and pressure loss of the filter are the key factors to be considered when selecting. After installing the filter, it will cause partial pressure drop or back to the system.
6, the filter replacement and cleaning should be convenient
7. Appropriate filter protection accessories (such as constant pressure opening device with bypass valve and filter contamination indicator) should be selected according to system requirements.
Therefore, when designing the hydraulic system, determine which filters need to be placed at those locations.
Hydraulic Filters
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