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When beneficiating graphite ore, protecting the large scales from damage is the main condition for obtaining high-quality graphite. When beneficiating graphite ore, no matter which process method is used, the process follows the crushing-grinding-flotation-dehydration sequence. be carried out in various aspects. Let’s learn about the equipment required in these graphite ore beneficiation processes!
Since the hardness of graphite ore is soft (medium hard or medium hard but soft), when the raw ore grade is in the range of 2~10%, the crushing stage can be based on Due to the properties of graphite, a three-stage opening, two-stage opening or one-stage opening process is adopted. If it is a small-scale weathered graphite ore, the grinding process can be carried out directly without crushing. Take the two-stage open-circuit crushing process as an example: the raw ore is fed into one stage for crushing and crushed to 0-75mm, and then screened by the vibrating screen. , are fed into the vibrating screen to continue screening, the undersized materials are sent to the grinding workshop, and the oversized materials are returned to the secondary crushing process.
The equipment required for the graphite ore crushing and screening process includes: crusher, screener and belt feeder, etc.
Crusher:The jaw crusher usually does one stage of coarse crushing, and the cone crusher does the second and third stages of medium and fine crushing. Operation;
Screening machine: Linear vibrating screen and circular vibrating screen are often used in one section, the former is used for coarse screening, and the thick one is mostly used for fine screening;
The graphite grinding process is very important and is a key process to ensure the integrity of large flakes. In order to select large flake graphite as early as possible, a multi-stage grinding process is generally used. The preliminary grinding uses a one-stage grinding process. In the ore process, it is ground to about 40% of -200 mesh, enters flotation, and then undergoes multiple regrinding processes.
The crushed qualified minerals are fed into the first-stage ball mill, ground to 0.074~0.3mm and then classified. The graded overflow obtains 0.074-0.8mm mineral particles, which are sent to flotation; the remaining particle sizes are returned Ball mill for regrinding.
The equipment required for the graphite ore grinding and classification process includes: ball mill, classifier, slurry pump, etc.
Ball mill: Mainly grid ball mill, overflow ball mill and straight ball mill, among which grid The ball mill is mainly used in the first-stage grinding operation, and the latter two are used in the re-grinding operation after flotation;
Classifier: It has a hydrocyclone (group) and There are two types of spiral classifiers. The cyclone equipped with a grid type is used in one-stage grinding and classification operations, and the spiral classifier is used in multi-grinding operations.
Graphite ore itself has good floatability, so the flotation method can effectively recover it. At this stage, a coarse and polyfine flotation method is generally used. Before sending the qualified mineral particles to flotation, they should be put into the mixing barrel first, add clean water and stir evenly, then flow into the flotation machine from top to bottom, add kerosene and diesel flotation reagents, and conduct preliminary rough separation. Operation, the products after rough separation are sent to the ball mill for regrinding operation, and the grinding products are fed to the next stage flotation machine for beneficiation to obtain graphite concentrate and tailings.
The equipment required for the graphite ore flotation process includes: flotation machine, flotation column, stirring tank, etc.
Inflatable type:There are several types of flotation machines: KYF flotation machine, XCF flotation machine, GF flotation machine and CLF coarse particle flotation machine;
Mechanical stirring type:There are several types of flotation machines: SF type, JJF flotation machine and BF type flotation machine;
Flotation column: strong>Bubbles can be formed internally during flotation, no external device is needed, and it is suitable for flotation of fine-grained graphite ore;
Stirring tank:There are two types: high-efficiency stirring tank and ordinary stirring tank. , mainly selected based on the usage of the medicine.
Graphite ore dehydration is mainly divided into two links, one is the dehydration of graphite concentrate, and the other is the dehydration of graphite tailings. Among them, for graphite concentrate dehydration, concentrators and filter equipment can be used. After the moisture content of the concentrate reaches certain requirements, it can be dried for industrial applications; for graphite tailings dehydration, a tailings dry discharge system can be used, using different The dehydration equipment (concentrator, filter/press, cyclone and dehydration screen, etc.) is combined to make the tailings moisture content lower than 15% before dry stack discharge.
Concentrator: There are high-efficiency concentrators, inclined plate concentrators, etc., which perform one stage of dehydration in the concentrate concentrator and two stages of dehydration in the tailings. The final underflow concentration is in the range of 60~70%;
Filter/filter press: Mainly box-type filter presses and vacuum filters, which can be used in concentrates and tailings, and are used for the final dehydration operation , so that the final dehydration rate is less than 15%;
Cyclone: There are cyclones and cyclone groups available, generally used in tailings dehydration, and the underflow contains water The rate is 40~30%;
Dewatering screen: Xinhai equipped it with a high-frequency dewatering screen, which is mainly used in tailings dry discharge and is used for three Stage dehydration can make the final dehydration rate below 20%.
In addition to the above required equipment, after graphite ore is ground in multiple stages, a lot of medium ore will be produced in the process, and these medium ores contain a large amount of graphite, which will lead to graphite loss if not treated. , reduce the recovery rate. Therefore, the medium ore still needs to be processed. At present, the methods for treating the medium ore of graphite ore include centralized return, sequential return, separate treatment and various combined treatment methods. The required equipment is mainly flotation machine and ball mill.
In the actual mineral processing plant, how to select the graphite ore beneficiation process method and mineral processing equipment should be determined according to the properties of the graphite ore. First, conduct the mineral processing test, pass the test analysis, and then design suitable graphite according to the actual situation. Only through mineral processing technology and complete sets of graphite mineral processing equipment can we obtain ideal graphite concentrate.
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