To discuss “Large Diameter Thickeners in the Phosphate Industry” is to discuss large diameter slimes thickeners in general. Since 1948, Dorr-Oliver has supplied these machines to the phosphate industry, originally as a means to reduce pumping costs, but more recently for environmental reasons as well. With the exception of the Caisson thickener, all the types … Read more
In many instances, Diatomaceous Earth (DE) filtration could be considered a relatively recent technology. In the late 1800’s there were many references to the use of DE in small scale filtrations and in most instances these were laboratory curiosities. The use of DE in the sugar industry was proposed in the 1880’s, but this was … Read more
What if the shaft were much larger, say, 300 m in diameter, or 3000 m, is the above approach to aquifer depressurization still valid? Is it feasible and practical to use wells to reduce the water inflow to a deep mine? If so, can the evaluation approach used in this paper be utilized? I believe … Read more
This paper presents a development of thickening theory which provides a reliable and easy-to-use method for determining the size of continuous thickeners from batch settling tests. It also offers a description of thickener operation performance based upon the proposed method. Thickener Operation Figure 13 shows a log-log relationship between underflow concentration and unit area at … Read more
The nature of slimes handled in the treatment of gold- and silver-ores has been discussed in technical literature to a considerable extent. The subject of slime-filtration from the practical worker’s standpoint has also received much comment, and scattered through the literature of the subject are descriptions of many slime-filtration installations. Articles of this nature serve … Read more
The Quarto Mine and preparation plant of Quarto Mining Company is based on the production of coal from the Pittsburgh seam. At this location the raw coal contains a substantial amount of refuse with some troublesome characteristics. The refuse at the mine face (about 50% of the mine output) contains only a very small amount … Read more