Graphite ore flotation process introduction

Graphite ore flotation process is an efficient graphite ore deep processing technology, it can greatly increase the application of graphite ore area, selected graphite ore concentrate, can meet the diverse needs of various fields of production. In this case, Graphite natural floatability is very good, generally use the flotation method, with neutral oil can be harvested. But we should pay attention to the following points in the flotation:
(1) first we should know the type of graphite ore. Graphite ore is divided into crystle graphite ore and earth-like graphite ore. Flake graphite ore is characterized by scaly or leaf-like graphite, ore grade is not high, generally 3% to 5%, the maximum not more than 20% to 25%. This type of graphite floatability is good, the flotation, the grade up to 90% or more, so the ore grade 2% to 3% can be mined. Flake graphite performance, generally used in the manufacture of advanced carbon products. Earth-like graphite is also called cryptocrystalline graphite ore. The graphite crystal of this ore is small, generally less than 1μm, the surface was soil-like, lack of luster, industrial performance than scaly graphite. The graphite ore ore grade higher, generally 60% to 80%, but the floatability is poor, the flotation, the grade will not be significantly improved, therefore, less than 65% of the grade of ore, generally not mining , Grade in 65% to 80%, after sorting can be used.
Therefore, for the graphite ore, we shoud not only see the content grade of its ore, but should first clarify the type, and then decide whether to use flotation program.
(2) sorting process we should pay attention to the protection of large scales flakes. Flake graphite is widely used, it has fewer resources, higher value, so the production must be taken to protect the large scales flakes not broken. Usually large scale is +50 mesh, +80 mesh, +100 mesh scaly graphite. Protection of large phosphorus tablets in the process of sorting is used in the process of multiple grinding multiple selection process. Each time the grinding of the monomer dissociation of the graphite to be elected in time, such as the ore once to a very fine grain size, it will destroy the large scale. For example, China’s large-scale graphite mine Nanshu graphite mine, which uses a rough election, a sweep, four grinding, six selection process, both to protect the large scales are not damaged, and concentrate grade 90% .
(3) the product quality requirements. Graphite products on the higher grade requirements, such as the general requirements of flake graphite grade in more than 89%, pencil graphite grade requirements in 89% to 98%. Some electric carbon graphite required grade of 99% and so on. In order to obtain high-grade graphite concentrate, graphite flotation, the number of selection are generally more.
Graphite beneficiation processing method
1. The processing of crystalline graphite mineral processing
Crystal graphite natural floatability is better in China this is the use of flotation method for beneficiation. As the graphite flake size is one of the most important quality indicators, so in the sorting method using multi-stage grinding, multiple sorting process in order to select the flake graphite as soon as possible. Flotation commonly used collector for the kerosene, diesel, etc., foaming agent for the second oil, fourth oil, adjusting agent for the lime, sodium carbonate, inhibitor for the water glass.
2. Aphanitic graphite beneficiation processing methods
Aphanitic graphite crystal is very small, it is also called microcrystalline graphite, graphite particles are often embedded in the clay, the separation is very difficult. As the ore grade high (usually 60% to 80% carbon), so many of the graphite ore mining will be directly crushed stone processing, the sale of graphite powder products. Hunan Lu Tong graphite mine was in the 50’s to establish flotation plant flotation microcrystalline graphite, but the cost is too high and stop production. At present, some units are still conducting micro-crystal graphite flotation process (such as oil reunion flotation, etc.) research. 3. Purification of graphite products processing
Modern industrial requirements for the development of graphite products to two aspects: First, the requirements of crystal scale to achieve high purity, the second is to require ultra-fine particles of graphite products (such as less than 1μm or 0.5μm). China has established a graphite refining and fine powder processing production line in Nanxu, Beishu, Liumao, Xinghe and other graphite processing plants. The purification method is mainly chemical purification. Graphite chemical purification of the most mature process is the use of caustic and graphite melting at 700 ℃, after washing to neutral, plus processing, washing, so that graphite carbon content of 98% to 99%. Some manufacturers use hydrofluoric acid to produce high-purity graphite.