In order to filter small amounts of fine slimy solids the reversible cake filtration process was developed. The filterable solids concentration in feeds can range from less than 1 ppm up to about 5%. The relative advantages of this process are usually the greatest in the range of.0.05% to 1.0% filterable solids. Filterable solids that … Read more
In deep strip mines the job of moving overburden may be so much bigger and more costly than the removal of coal or ore that the operation is often called dirt mining. Constant improvement in stripping machines and techniques of using them is needed to offset rising costs and to increase production in mines that … Read more
One of the major problems in the purchase and sale of coal shipped in lake or ocean going vessels has always been, the difficulty in obtaining a true analysis of the shipped coal’s quality because of faulty sampling by manual methods. As long as coal was sampled according to standards set up by ASTM methods … Read more
Undercut-and-fill- mining is a method developed by the International Nickel Company to deal with abnormal-pillar mining conditions at one of its mines. Results have been such -that its use has been extended to normal pillar recovery operations in other mines of the Company as a replacement for conventional square-set pillar mining. It is anticipated that … Read more
The operation of a series wash thickener-two stage filtration circuit determines the soluble loss in many hydrometallurgical operations. A study of this circuit yielded expressions which permit calculation of soluble loss for almost any condition of operation. The soluble loss over a range of the circuit variables is presented to illustrate and evaluate circuit performance. … Read more
Compared to the uranium ores in Colorado Plateau and New Mexico, the uranium-bearing lignites in North and South Dakota are relatively difficult to process. This is due chiefly to the irregular mineralization of the lignites, and partly to the non-uniform distribution of uranium within the deposits. The three lignite samples used in this investigation were … Read more
Comminution efficiency can be expressed in three different ways. Theoretical Efficiency: actual energy consumed, in a comminution machine compared to the theoretical energy required to make the size reduction. Operating Efficiency: compares the operating work index, calculated from production comminution machinery operating data, to the Bond Work Index from bench scale comminution tests or calculated … Read more