High Pressure Grinding Rolls
High-pressure grinding rolls (HPGRs) have struggled for acceptance into the hard-rock mining sector. CRITICAL HPGR PARAMETERS HPGR roll diameters typically range from 0.5 m to 2.8 m, depending on the supplies, and roll widths vary from 0.2 m to 1.8 m. The aspect ratio of the rolls also varies as a function of manufacturer. Typical […]
Homemade Rock Crusher DIY
The 911JAC12K MINI Rock Crusher is our smallest rock crusher, designed for those on a tight budget. It includes all the high-quality, precision-machined parts that are pre-cut and ready to weld, making it a compact version of a small jaw crusher. It is a Do-it-yourself version of on Mini Crusher. You will need to supply […]
Manganese Removal Case Study
The Problem Relatively low manganese levels in water can result in tainting of taste as well as discoloration of the water and the surfaces it comes into contact with. The Drinking Water Inspectorate (DWI) in the United Kingdom have set a maximum allowable limit of 50ppb, well below the WHO guidelines of 400ppb. While the […]
Alimak Raise Climber at Iron King Branch of Shattuck Mining Corp
The Alimak Raise Method, using the Alimak Climber, has proven to be a new, fast, economical method of driving raises at the Iron King Branch of Shattuck Denn Mining Corporation, Humboldt, Arizona. In order to fully understand the advantages of the Alimak Raise Climber, it is necessary first to describe the basic machine; second, a […]
Call For Contributors To Canadian Milling Practice 2020
It is with great excitement that we announce the forthcoming release of Canadian Milling Practice 2020. This much anticipated volume will follow the tradition established in 1957 with the release of “The Milling of Canadian Ores”, followed by “Milling Practice in Canada” in 1978, and “Canadian Milling Practice” in the year 2000. The new edition, […]
Mining Project Financing
In the recent past, there have been numerous projections of the capital requirements for additional mine and processing capacities required to meet projected non-Communist World demand for minerals during the next 15 years. A consensus judgment would place this currently at $14 billion per year, with the largest expenditures required for increases in aluminum and […]
Calculating Mass Flow Balances
Calculating material flows from analytical data by means of the standard two-product formulas grew increasingly difficult and time-consuming as the complexity of the flowsheets increased and as choices between conflicting analytical values had to be made. Mathematical Formulation of the Problem Any metallurgical flowsheet can be represented by a set of directed lines called branches. […]
Electrolytic Method for Recycling Scrap Batteries
Electrolytic Method for Recycling Scrap Batteries Objective To devise an economical, environmentally acceptable method for recycling scrap lead-acid batteries. Approach A combination electrorefining-electrowinning method for recycling lead metal and sludge from scrap batteries was devised which produces a 99.99 + percent pure lead product and eliminates the lead and sulfur oxide emissions that are […]
Tin Tungsten Mineralization
Tin and tungsten are critical and strategic minerals to the United States. The basis for such a designation exists in the historic and current (1989) net import reliance of these metals by the United States as a percent of apparent consumption. Estimates by the U.S. Bureau of Mines for 1989 indicate a 73% net import […]
Potash Recovery by Solar Evaporation & Flotation
Over 80 pct of U.S. potash production comes from evaporite deposits near Carlsbad, NM. Most potash products are concentrated by flotation, selective dissolution of the gangue minerals, or precipitation of the mineral from hot brine. The majority of sylvinite ores, mixtures of KCl and NaCl, mined in New Mexico, are processed in grinding, desliming, sylvite […]