论文部分内容阅读
黑心可锻铸铁希望硫分愈低愈好;因此首先讨论了碱性冲天炉用于可锻铸铁熔化的可能性。理论分析表明,冲天炉内铁水增碳多少是直接与渣的碱度有关。采用去硫所必需的碱性渣将不可避免地导致增碳的加剧,从而使碱性冲天炉难于用来熔化可锻铸铁。各种炉外去硫法都由于铁水温度的显著降低,而不适用于可锻铸铁。冲天炉—电炉的双联法虽有采取去硫措施的可能,但却不能满足经济上合理性的要求,因而也难于普遍推广。既然可锻铸铁生产目前尚无切实可用的去硫办法,因此当所用焦炭和生铁含硫过高时,高硫可锻铸铁就是不可避免的。文章讨论分析了国内工厂对付高硫的两种主要办法:一是提高硅分同时降低退火温度,其二是加微量的硼铋。这方面已取得显著成绩,但为了进一步提高质量和降低成本,把硫分降低到正常含量以内仍是今后的努力方向。
Black heart malleable iron hope the lower the sulfur content as possible; therefore, first of all discussed the possibility of alkaline cupola for melting malleable iron. Theoretical analysis shows that the amount of carbon in the cupola furnace is directly related to the alkalinity of the slag. Alkaline slag, which is necessary for desulphurization, will inevitably lead to an increase of carbon so that it is difficult for alkaline cookers to melt malleable iron. A variety of furnace desulphurization method due to the significant reduction in the temperature of hot metal, but not for malleable iron. Cupola - electric double-circuit method although the possibility of taking desulfurization measures, but they can not meet the requirements of economic rationality, and therefore difficult to universally promote. Since malleable cast iron production currently does not have a practical desulfurization method, high-sulfur malleable cast iron is inevitable when the sulfur content of coke and pig iron used is too high. The article discusses and analyzes the two main ways to deal with high sulfur in domestic factories. The first one is to increase the silicon content and reduce the annealing temperature at the same time. The second is to add trace amounts of boron and bismuth. Significant achievements have been made in this respect, but it is still the future direction to reduce the sulfur content to within the normal content in order to further improve the quality and reduce the cost.