| 摘要 |
Two or more sand additive particles are made to adhere to each other, using a binder. The finished product consists of free-flowing particles that are composed of the additive particles bound together by the binder. These bound additive particles may then be app lied to sand, such as foundry sands, where, otherwise, multiple additions of additive might nee d to be made. The pH of the single additive particles can be controlled and separation of the additives due to different specific gravities can be avoided. Various mixtures of different a dditives are disclosed Methods of controlling particle size of additive particles, tendency to gene rate dust, degrade tensile strength or control thermal expansion of foundry cores or molds by u sing bound additive particles are also disclosed. |
