The Blake crusher had its origin in a decision by the town council in New Haven, Connecticut, in 1852 to build a 3.2-km road in the center of the town using the MacAdam process. Eli Blake was one of the townsmen responsible for planning the road, and he realized that the cost would be reduced […]
Рубрика: The History of Grinding
The Maxecon Mill
The Maxecon mill had a vertical grinding ring rotating around a horizontal axis and three convex horizontal rollers that rotated independently and were pressed against its FIGURE 6.9 Diagrams of ring-roller mills: (a) Chilean mill in which a vertical shaft rotates heavy cylindrical rollers around a plane ring race (b and c) Loesche mills and […]
TUMBLING MILLS FOR GRINDING ORE
After 1900 the grinding of Portland cement raw material and of cement clinker required large numbers of tumbling mills. This was also the heyday of gold mining. The old stamp mills that were used in great numbers for grinding gold ore did not grind sufficiently fine to liberate all of the gold, and the new […]
MATERIALS FOR WEARING SURFACES
The working surfaces of crushers and grinding mills are lined with wear-resistant materials to protect the permanent parts. The history of wear protection is an integral part of the history of comminution, because it is a major factor in the operating costs for circuits. Replaceable surfaces were used as early as the 1880s in South […]
Static Separators
An early invention was a static air separator in which there are no moving parts and classification occurs by changes in air velocity and direction. Figure 9.8 shows the method of operation of a cone-type separator. The air stream (C) carrying the particles is converted from a directional flow through the outer cone into a […]
Technology
Each new generation of computers—particularly personal computers—increases the availability of and the capabilities for creating simulations for all sizes and types of size — reduction processes and machinery. Computers will continue to be important tools in studying size reduction and in making the needed developments. Manufacturers of mechanical machines and electrical motors have demonstrated the […]