Хонинговальные головки

By 1960, autogenous grinding had become reality. Aerofall Mills Ltd. and the Hardinge Company had sold 50 mills worldwide; Dorbyl in South Africa and Allis-Chalmers in the United States had started manufacturing them; and Morgardshammar in Sweden and Tyazhmash in Russia would begin manufacturing them soon. The road had been long and difficult, but the […]

Most of the work in the mining industry up to 1950 was for dewatering or desliming. The big breakthrough application for the cyclone, however, was just around the corner. In 1951, metallurgists at the San Manuel operation of Magma Copper Corporation (San Manuel, Arizona) experimented with a specially designed cyclone for closed-circuit grinding. The results […]

Blasting is a complex process and many variables are involved. Consequently, a model of blasting that predicts fragmentation accurately is necessary to optimize total size-reduction systems. The first theory of blasting was proposed in 1792 and a model based on it was used to design blasts (Drinker 1888), but its objectives, details, and how well […]

Copyright © 2005 by the Society for Mining, Metallurgy, and Exploration.All rights reserved. Electronic edition published 2009. During our professional careers, we placed our principal emphasis on understanding the role and use of energy in size reduction, particularly in the areas of crushing and grind­ing minerals, the use of simulation for crushing and grinding circuits […]

Eli Whitney Blake was a member of a leading family of industrialists in New Haven, Con­necticut, which had a tradition of invention and entrepreneurship. The family’s main business was the manufacture of arms, but family members participated in civic affairs and assisted in planning the development and servicing of the city. Genetics may have been […]

Every revolution requires a catalyst, and it was the need to pump water from mines that sparked the revolution of steam power. By 1650, coal and tin mining were important industries in England, and water had become a serious problem in many mines that had been worked for centuries, particularly the deep tin mines in […]

In the edge mill, which had been developed in China in about 200 ad, a stone or concrete disk rotated on a stone base. The ancient edge mill is still used in many communities: In 1975 people in Antakya dried and ground their wheat in September for winter. This was done in meydans (village squares). […]

Although ball mills were tested in the 1860s (Del Mar 1917), the main progress in fine grinding during 1870-1900 was in Germany. The German mineral industry had started to decline after hundreds of years of world leadership, but the cement industry was growing and with it the demand for fine grinding of clinker. The growth […]

Tumbling mills are basically described by the type of grinding media used, whether they grind the feed wet or dry, by the type of discharge arrangement, and the shape of the cylindrical part of the mill. All tumbling mills have common features: ■ Drives ■ Support bearings in which they rotate ■ Cylinders ■ Feed […]

In the early 1950s, cyclones were being used in the kaolin industry to separate the finest kaolin particles into products that could be sold at a premium. Their success gave a boost to cyclone technology and led to the design of small cyclones that could efficiently extract the very fine particles from the feed. This […]