Research On The Effects Of Low-carbon MgO-C Performance Factors

With the rapid development of cleaning steel smelting, the graphite of magnesia carbon bricks causes the carbon pollution is worsening, so we need develop a low-carbon MgO-C bricks to suit the needs of clean steel smelting. In this thesis, fused magnesias and graphite as main raw materials, metal Al powder as antioxidants, phenolic resins, hot asphalt as a binding agent, Investigated by adding different amounts of graphite, on various properties of MgO-C bricks 。By selecting different magnesia critical particle size, particle size distribution of the aggregate adjusted magnesia studied the impact of various laws on the physical properties of low carbon MgO-C bricks, by pressing the close-packed particle theory Andreassen continuous particle size distribution calculated discuss the effects of different size and different magnesia critical factors for the low-carbon MgO-C particle size distribution and physical properties, resistance to slag corrosion resistance; Study the impact on low-carbon MgO-C ‘s bulk density, porosity, temperature pressure, antioxidant and anti-permeability properties of slag 100 mesh and 300 mesh adding different proportions and phenolic resin composite with high temperature asphalt impact on the performance of the composite carbon MgO-C bond. The results showed that:1.With the decreasing of graphite contents, Bricks cold compressive strength increases, thermal shock resistance, spalling resistance increased.Adding 6% graphite,the bricks’ s cold temperature performance and high temperature flexural strength, thermal shock resistance, slag corrosion performance is best, can be adapted to the needs of clean steel smelting. 2 when the critical size is the same, the larger the value of q(q = 0.44), has a good bulk density and strength properties at cold temperature; When the same value of q, Samples of the critical particle size is 5mm, its volume density, compressive strength at room temperature and the temperature flexural strength is increaseing; from the slag corrosion performance point of view, with a smaller q value can increase resistance to slag erosion capacity products. Therefore, the use of different occasions environment, can improve the strength or resistance to slag erosion capacity by changing the value of q Bricks particles.(3) when the composite 1% 300 mesh, 100 mesh 4.5% graphite, carbon Bricks overall performance is better; When adding 5.5% 300 mesh graphite, MgO-C slag penetration resistance performance is good; when MgO-C all use 100 mesh graphite,the oxidation resistance is best; adding 1% hot asphalt can improve its high-temperature flexural strength, has little effect on the bulk density, porosity, compressive strength. but reduces oxidation resistance, continue to add the various performance greatly re duced.