Zenith Diamond Mining Equipment for Sale

It is further particularly found that the use of fluorocarbon resins as grinding agents affords very significant advantages with respect to freedom of the flake product from fines. That is to say, by grinding in the presence of a fluorocarbon resin, an advantageously brilliant flake product (free of excessive fines which would darken or dirty the product) is very readily achieved,diamond mining machines without close or critical control of operating conditions (e.g. time of milling) as has heretofore been necessary to minimize the occurrence of fines in flake metal pigments such as gold bronze produced e.g. with stearic acid. This flake product obtained with the present invention is more uniform in paiticle size than that produced by previously proposed methods, as with stearic acid, and can more readily be separated into desired grades of relatively uniformly sized flakes. Moreover, especially in the case of gold bronze, this product exhibits improved flowing properties, as when dispersed in an ink vehicle for printing or other such application.

Broadly, then, the method of the invention comprises grinding finely divided metal to flake form in the presence of a fluorocarbon resin or resins as a grinding agent. The grinding procedure may be performed in a ball mill, stamping mill or the like, i.e. in equipment as presently used for grinding flake metal powders, operated in conventional manner and with conventional steps of supplying feed of divided metal and grinding agent to the mill and withdrawing flake product therefrom. In other words, except for the use of the fluorocarbon resin as part or all of the grinding agent, the grinding operation and desired preliminary and subsequent treatments may be carried out in essentially the same manner, and with the same techniques and equipment, as in methods heretofore employed for making metal flakes using conventional grinding agents, such operation and equipment being well known to those skilled in the art....