Scale graphite alkaline flotation process and pharmaceutical system

Natural flake graphite ore is widely available worldwide, but only Canada, Brazil, China, Madagascar, Russia, Germany and South Africa are widely supplied to the international market. These countries flake graphite beneficiation plant can produce different levels of product 1,2,3, grade 1 flake graphite flake diameter of the largest, Class 2 has a diameter of medium-sized, third grade product is fine flake graphite. The carbon content of the flake graphite after beneficiation is generally 80 to 99.5%.

The main producing areas of Chinese flake graphite are Shannanshushu, Heilongjiang Liumao and Inner Mongolia Xinghe. The cause of scale graphite ore is regional metamorphism, that is, sedimentary rocks originally containing a large amount of organic matter undergo moderate to deep regional metamorphism, causing carbonaceous gasification to overflow and cooling and recrystallizing into high-quality scaly graphite under suitable geological conditions. Crystals; another cause is contact metasomatism, also known as skarn deposits, mostly in contact with deep igneous rocks and limestone, where the carboniferous rocks have mostly been skarnized.

It can be seen from the above genesis that scaly graphite ore is prolific in gneiss , schist, crystalline limestone and skarn, and there are more than 20 kinds of symbiotic minerals, including graphite, feldspar , quartz , tremolite and diopside. Etc., the content is relatively stable; followed by serpentine, biotite , sericite, chlorite, epidote, garnet, etc., the content changes greatly. There are minerals, changes the content of pyrite, pyrrhotite, yellow copper ore, apatite, zircon, sphene, rutile, limonite great. The graphite is crystalline scaly or leaf-like, black or steel gray, mainly distributed between feldspar, quartz or diopside and tremolite particles, with obvious orientation, consistent with the direction of the layer. Graphite scales are generally (1.0~2.0)X (0.5~1.0)mm, sheet thickness 0.02~0.05mm, maximum scale can reach 4~5mm, and the minimum is (0.5~1.0)x(0.25~0.5)mm. The graphite content is generally 3% to 10%, and individual can reach 20%.

The ore is generally blue-gray and weathered yellowish or grayish white. Fine to medium grain, with scaly granitic crystal structure, granular crystal structure, fiber scale crystal structure. Hemp-like structure and disseminated structure. The ore is mostly subjected to intense mixed lithification, and the addition of feldspar and quartz tends to lower the ore grade. Graphite alkaline flotation process and pharmaceutical system Graphite ore contains a large amount of impurity minerals, especially the scale graphite ore grade is very low, must be enriched by beneficiation. Flotation is the main method of graphite beneficiation, but the flotation of flaky graphite is different from amorphous graphite. Pay attention to the protection of graphite scales during the process of scale graphite dressing.

The scale graphite ore has a low grade, generally 3% to 15%, but the flake graphite has good floatability. In the process of beneficiation, in order to protect the scales of graphite, multi-stage grinding multi-stage sorting is required, and the dissociated large scale graphite can be separated in time by screening (or hydrocyclone classification) to avoid repeated wear and tear. Conventional coal flotation oil, diesel oil, heavy oil, sulfonate, sulfate, aliphatic, phenols, hydroxyacids as the collector, oil II, IV oil, ether alcohols, ether oil as a blowing agent. The general process is: raw ore coarse crushing - fine crushing - coarse grinding - flotation - concentrate re-grinding - dehydration - drying - grading - packaging.

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