Arizona republican., 1897-11-13
A DRY CONCENTRATOR.

On Willow street in Los Angeles there is in operation novelty in the shape of dry concentraisor It has been fully demonstrated that, to sf feet close concentration of the metal from the gangue, it is nee1ful that the granulai5ion of the ore should be as near even as it can be made. To ac- cOmplish this, one J. B. Freeman has invented and pEGfected a peculiar mechanism in an ore br5aker and an ore pulveTiZer, in which both jaw plates are caused to be moved in op- posite directions; there is at the same tima a closing mOtiOn-virtual1y tear- ing iihe rock apart along the lines of it's cleaveS and fracture. An eXhibi- tion of the small amount of power re quired was made to the writer by the inventor placing within the jaws of the breaker a pi5ca of hard quartz, about three inches in diameter, and, by a direct pull on the balance wheel, breaking the rock in several pieces The pulVlriZer is made on the same principle, only the construction is somewhat different. While the jaws of the mock breaker move only to the center of closing, the jaws of the pull veriZer pass as far as GhIa, raverSe way, thereby making a peculiar motion, one jaw goGhg one way, while the other jaw is going the reverse way. By this method, very even granUla- tion of ths Ora Is made, and the man mer of making three or four sizes of the gramulated ore enables a very close saving and concentration of the ore to be made.
 The ere is pasI-d through the rock breaker, where it is broken to what will pass 11s inch rig It then goes to the pulverizing machine, where it is reduced to where it will pass a No. 10 mash scraen. About One4haf of the ore has been reduced to a size that will pass a siXty-mesh screen. The remainder is sent to pair of rolls for finishing.
 By this manner of pulverizing the granulation of thes oq,a is very even. The finer particles, that will pass a 1G0-mesh screen, having a sharp feel ing, in strong contrast with the pro- duct of Q stamp mill, which will have a soft, greasy feeling. The ore, af- ter passing the rolls, is elevated to a revolving screen, where it is sized to the required fineness, the particles that are not fine enough aira returned to the rolls for regrinGiug.
 By various experiments t has been found that by sizing the particles of pulverized ore, i. e., getting the par ticles of quartz and particlas of metal claSsed together as to size, a better separation of the metallic substances can be made. A force sufficient to eff feet a concentration of ors, that wou d ordinarily pass a forty mesh screen, will be far in excess of what will be required for that which will pass a 100-mesh in the Freeman concentrat- or. Thus, by making different sizes, and passing each size to a concentra- tor of its own, a mono perfect con- centraiion cam be made than could by passing the pulp through old style concentrahoTs. After the ore is gran ulated, it passes through another re- vOlving reel, whera it is made into four grades, and is then conducted to the pulverizer. The Western Mining World is of the opinion, however, that the success of the new mechanism must largely depend upon tine class of ore treated. It has not, we believe, been demonstrated as an all-around proposition as yet