A New Technique for Improving Quality of Low-grade Magnesite
In Iran the shortage of magnesite with suitable properties for refractory industry has become a major problem.Therefore,attempts to improve the quality of low grade magnesia are very essential.Owing to non-uniform distribution of impurities in magnesite structure,C/S ratio in the ore deposit and hence in the clinker produced is different.It means each particle behaves according to the properties of its constituent phases.Thus,the predominant impure phase cannot be predicted only by mean analysis.In other words,mean analysis is usable while the impurity distribution in the ore body and the formed clinker is fairly uniform.This attitude leads to the definition of a new product called pellet magnesite.In the present study,a number of various low-grade magnesite samples,which are inappropriate for processing due to relatively high CaO or SiO2 content,are blended (to get good C/S) and calcined in a MHF furnace.The produced mixture is powdered and platted before being fed to arotary furnace for sintering.The results indicate that the pellets produced from the low-grade magnesite samples (i.e.MgO=80%),using the proposed simple technique,are comparable to those formed from high-grade magnesites (i.e.MgO=90%).
Mehrzad Zamanipour Alireza Bagheri
Iranian Refractories Procurement & Production Co., Birjand, Iran,
国际会议
The 6th International Symposium on Refractories (第六届国际耐火材料会议)
郑州
英文
432-435
2012-10-18（万方平台首次上网日期，不代表论文的发表时间）