低品位复杂矿烧结碱度优化试验

 为了合理利用新疆区域的贫矿资源，优化高炉炉料结构，开展优化烧结矿碱度的试验研究。利用50 kg烧结杯，针对新疆复杂矿做了7组碱度为1.65～2.00的烧结杯试验。通过对烧结矿机械强度、冶金性能及矿物组成分析，得出碱度为1.80～1.85时，烧结矿中铁酸钙质量分数明显增加，烧结矿的ISO转鼓强度较高，成品率最高达到78%，还原度和低温还原粉化指数均得到改善，软熔区间最窄，为最优的烧结碱度区间；而碱度为1.65～1.75时，转鼓强度降低、熔滴性能变差，处于烧结矿的粉化区间，配加新疆区域复杂矿烧结生产时应避开此碱度区间。

Optimization experiment of sinter basicity on low-grade complex ore

In order to utilize the lean ore resources in Xinjiang rationally and optimize the blast furnace charge structure, the optimizing experiments on sinter basicity were carried out. In view of the complex ore in Xinjiang,Seven groups of sintering pot tests were conducted. The basicity of all these tests changed among 1.65 and 2.00. Through analyzing the me-chanical strength,metallurgical properties and mineral composition of sinter,it is concluded that when the alkalinity was between 1.80 to 1.85,an obvious increase of the SFCA content in sinter can be observed,the ISO drum strength of sinter was comparatively high and the yield can be as high as 78%,the reducibility and low temperature reduction desintegra-tion index of sinter were also improved,and the soft melting range was the narrowest. So it is the optimal basicity range of sinter. However,when the basicity was among 1.65 and 1.75,the drum index declined and the property of molten drop became worse. It is the pulverization basicity interval of sinter,therefore considering the complexity of ore in Xinjiang ar-ea,this range should be avoided in sintering production.