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Limestone for portland cement must be beneficiated to produce uniform raw material for the kiln. Careful quarrying and selective recovery are factors in this process, but the chief aspects of beneficiation are "in plant" processes, such as crushing and screening, washing, grinding, flotation, and heavy-media separation. Numerous technical and economic problems exist. Detailed studies of the limestone deposit and the stone itself are required for intelligent beneficiation.
 In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a laterite ore dressing process enriched in nickel and/or cobalt, which has strong ore dressing, high grade of refined nickel, recovery of nickel and The enrichment ratio (enrichment multiple) is high.
132,467 7 Claims. 241-197) This invention relates to hammermill hammers of the type having one or more face portions which, when in use, are subjected to abrasive and impact forces directed longitudinally of the working face or faces., a corporation of Minnesota Filed Aug. Paul, Minn. No., assigner to Paper CahnensonCo. The invention also includes an improved method of forming or building up hard faces on such hammers. Eilers, St. (Cl.SURFACE HARDENING FOR HAMMERMILL HAMMERS Filed Aug. 18, 1961, Ser. 18, 1961 United States Patent l 3,045,934 SURFACE HARDENING FR HAMMERMILL HAMMERS Howard F.
 In one example embodiment, the present invention is a method for grinding a solid in a vertical roller mill (VRM). It has now been discovered that certain amino acid derivatives that include a carboxyl group (in either acid or salt form), an amine and an alcohol group, such as ethanol diglycine (EDG), surprisingly reduces VRM milling instability. The method comprises grinding at least one solid in the presence of a grinding stabilizing additive, wherein the grinding stabilizing additive comprises an alkanol amino acid compound or a disodium or dipotassium salt thereof having the structural formula:. In example embodiments, the solid being ground comprises one or more of a cement clinker, gypsum, a supplemental cementitious matter, or a mixture thereof.
A major application for lignite is in conjunction with chrome lignosulfonates for improving the filtration property and thermal stability of mud. It maintains stable filtration rates in drilling hot holes.Lignite is an organic thinner that serves water muds for filtration reduction, oil emulsification, and stabilization of properties against high-temperature effects. It is not used as a thinner for salty muds.
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