When extremely sharp classification is needed to separate -4 mesh (5mm) granular material by size, McLanahan Hydrosizers™, also known as Density Separators, are comparable to screening, but at a fraction of the footprint and cost. A producer who needs tight control over classification or wishes to separate minerals of two different specific gravities would be an ideal candidate for a Hydrosizer™.Hydrosizers™ can be used in a wide variety of industries including construction and specialty sands, frac sand, iron ore, phosphate, coal, minerals sands, and other ore concentrates. McLanahan combines Hydrosizers™ with other equipment such as Hydrocyclones, Separators™, Pumps, Attrition Cells, Dewatering Screens, Thickeners and Filter Presses to offer complete wet processing plants.
The Hydrosizer™ is perhaps the only piece of mineral processing equipment suitable to make the discrete cuts that meet the needs of frac sand production.
To make its extremely sharp classification, Hydrosizers™ use hindered settling technology. Feed material enters the top of the unit via a central feed well, after which water is injected and creates an upward rising current. This establishes a zone of suspended, or teetered, solids. Fines then flow over a weir at the top of the unit, while coarse solids collect in the lower cone.
The McLanahan Hydrosizer™ maintains separation automatically through a simple PID control loop. Set the water injection rate and the desired operating density, then walk away. The Hydrosizer™ control monitors the classification environment and adjusts the underflow valve to maintain a consistent performance. There are no screen cloths to maintain, the unit automatically compensates for changes in feed rate, and the only moving part is the underflow valve.
McLanahan includes a manual globe valve and flow meter with every unit so teeter water can be adjusted easily and has a specially designed teeter water nozzle that opens when water flows through and closes at rest to prevent sand from plugging the water line.
Side accessible spray bars and side replaceable teeter water spray bars keep maintenance personnel out of the tank, avoiding enclosed space entry. Additionally, the pinch valve on the underflow closes to reduce the risk of dumping contents in the event of a loss of air/power.
McLanahan has a lab-size Hydrosizer™ unit for test work. In the field, process engineers take feed, underflow and overflow samples to analyze the separation efficiency.
Since 1919, A.F. Gelhar Co, Inc. in Markesan, Wis., has flourished by providing silica sand to foundries throughout Wisconsin. In 2009, the company realized it was in a prime position to take advantage of the growing demand for silica sand to use in hydraulic fracturing – or fracking – and began looking for a system to help them meet the demands of the frac sand industry. READ MORE
In Wisconsin, press reports have called frac sand the “new gold rush,” because of its critical importance in the process using hydraulic fracturing – or fracking – to extract oil and natural gas. The state’s abundant deposits of coarse-grained quartz sand have been mined for more than 100 years, but today, oil and gas industries prize this sand that is found in the state’s countryside. READ MORE