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一、使用稻草灰的现状在铸造生产中使用铁水覆盖剂,应具备的性能有三个方面: 1.良好的聚渣性能; 2.覆盖性能好; 3.保温性能好。使用稻草灰作铁水覆盖剂时,也存在以下问题: 1.稻草灰在高温铁水表面覆盖,所形成的覆盖层,是松散结构,强度差,在浇注过程很难阻挡少数松散的小块聚集物易随铁水浇入型腔,因此需设专人挡渣。稻草灰形成的覆盖层气密性很差,对铁水与空气有效地隔离很差,在球铁生产中对铁水中易挥发元
First, the status of the use of straw ash In the casting production of hot metal covering agent, should have the performance of three aspects: 1. Good performance of the slag; 2. Covering performance; 3. Insulation performance. There are also the following problems when straw ash is used as a hot metal covering agent: 1. Straw ash is covered on the surface of high temperature hot metal, and the covering layer formed is a loose structure with poor strength. It is difficult to block a few loose small aggregates during pouring Easy with the molten iron poured into the cavity, so need to set up a special slag. Straw ash cover the formation of poor air tightness, the effective separation of hot metal and air is poor in the production of ductile iron in the volatile elements