​​Selection of Natural Flake Graphite Types And Key Factors in MgO-C Refractory Production​

Types of Graphite Used in MgO-C Refractories ( Magnesia Carbon bricks)

High-crystallinity natural graphite for MgO-C refractories

The origin of magnesia carbon brick

Magnesia-carbon refractory materials have embarked on their unique industrial journey since their development by Japan in the 1970s for electric furnace applications. This material was first tested for applicability in electric furnaces and underwent rigorous testing for six years before being officially promoted for use in electric furnaces. Its uniqueness lies in the fact that by adding natural flake graphite and carbonaceous binders, the thermal conductivity of the material is significantly improved and the thermal expansion rate is reduced, thereby greatly optimizing the overall performance of magnesia-carbon bricks, especially their slag resistance and thermal shock stability. Because of this, magnesia-carbon refractory materials play a crucial role in multiple parts of ultra-high power electric arc furnaces, such as furnace walls, furnace tops, and high-temperature hot spots with severe erosion.

Types of natural flake graphite and influencing factors

Natural Flake Graphite, as the carbon raw material for magnesia-carbon refractory materials, primarily adopts flake graphite. Based on the fixed carbon content, flake graphite can be categorized into high-purity graphite, high-carbon graphite, medium-carbon graphite, and low-carbon graphite. Flake graphite of varying purity and particle size affects the high-temperature performance and oxidation resistance of the material. Fixed carbon is the core component in graphite, and its higher content leads to better mechanical properties such as high-temperature strength and flexural strength of magnesia-carbon refractory materials at high temperatures. Purity and particle size must meet the requirements of high-temperature environments to ensure optimal performance..

Xingshi New Material Suggest the model +895 ( 80 mesh, 95% Fixed carbon content), +195 (+100mesh, 95% Fixed Carbon content) and +194( +100mesh, 94% Fixed Carbon content )