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Found 5 results

  1. Since the test work has been extensive in Flotation Equipment, it is accepted as being reasonably precise in predicting results; however during the operation of the resulting plant the design is sometimes found to be inadequate. It is then suspected that the flaw in the design process lies in the samples not being sufficiently representative of the ore body, since using only a single or small number of composite samples does not recognize the variability of the flotation response of the ore, nor does it allow for the lack of ore body representation used in the design. It had not been possible to estimate the risk or error in the expected results. Flotation is not generally applied to ores containing a preponderance of values in free metals except for certain well-known exceptions such as the floating of native copper, gold, silver, and free metals having a high degree of luster. The notable occurrence of native copper ores is in the Keewenaw district of Northern Michigan. This area, one of the older mining districts of the United States, obtained its recovery entirely with gravity plants until the late 20s. As higher recoveries became more essential, a detailed investigation was made of the flotation process and it was put into general use immediately thereafter for the recovery of relatively fine native copper, heretofore lost in the gravity plants. Flotation is one of the key technologies within the mineral processing catalogue. And while the concepts have remained more or less unchanged since the concept was first introduced, there have been some very significant developments in the areas of both technology and reagents over the years. Take, for example, the introduction of column cells, which at the time was considered revolutionary. Today, column cell technology is widely used throughout the industry. Or the continuing trend toward larger and larger flotation units, as concentrators are designed for ever-increasing throughputs of lower head-grade ores. If you want to know more information, please visit this website: https://www.goldenmachine.net/product/flotation-equipment/
  2. Flotation Equipment technology design includes data calculating and flowsheet drawing. To implement data calculating, relative matrix is used to express the flotation flowsheet, special mineral processing models and optimizing mathematical models have been used. The "binary tree" principle has been used to demonstrate the flotation flowsheet structure, and the coding principle according to the order of preorder traversing to "binary tree" is determined for the implement of the flotation flowsheet drawing. As a result, the computerization of flotation technology design was completed. For meeting the forecasting target of key technology indicators in the flotation process, a BP neural network soft-sensor model based on features extraction of flotation froth images and optimized by shuffled cuckoo search algorithm is proposed. Based on the digital image processing technique, the color features in HSI color space, the visual features based on the gray level cooccurrence matrix, and the shape characteristics based on the geometric theory of flotation froth images are extracted, respectively, as the input variables of the proposed soft-sensor model. The traditional approach to flotation plant design involves the extensive testing of a single large composite sample or a small number of composite samples that are reputed to represent the ore body. Laboratory tests are conducted to establish a process with potential flowsheets and reagent suites. The process is then confirmed by pilot plant work on a large bulk sample or a few samples. The size of equipment required to achieve a specified throughput, recovery and product grade is then calculated from one of a variety of scale-up models. High quality products, good service. What you need is exactly what we can do! If you want to know more information, please visit this website: https://www.goldenmachine.net/product/flotation-equipment/
  3. What is often a secondary consideration is whether the design is optimal from the point of view of recovering all of the different types of ore particles that are present. Consideration must be given to both the particle size and liberation distributions of the ore. Decades of research have shown that the basic mechanisms of particle collection in the pulp and froth zones of a Flotation Equipment are different based on size and liberation of the ore particles. As a result, using large vessels as roughers is a compromise since some ore particle types are recovered more efficiently at the expense of other types. Initial study of the flotation concept was in the late 19th century. The basic process involves the selective coating of a particle's surface to alter or enhance its surface chemical characteristics. The flotation process is widely used for treating metallic and non-metallic ores. A greater tonnage of ore is treated by flotation than by any other single process. Practically all the metallic minerals are being recovered by the flotation process and the range of nonmetallic minerals is steadily being enlarged. Performing flotation within the grinding circuit has been successfully utilized by many concentrators across the globe for decades and has advantages including the reduced need for water, chemicals, and power when compared with the conventional style of flotation. The term “unit cell” is used to encompass all forms of flotation within the grinding circuit and includes both cyclone underflow and mill discharge (cyclone feed) flotation. Limited resourse, unlimited science and technology. We are ahead of our peels because of our constant pursuit of technology. For more information, please visit this website: http://www.goldenmachine.net/product/flotation-equipment/
  4. "While grindability changes due to the variation in ore properties are disturbances to the grinding circuit, they generate feed rate changes as disturbances to the flotation circuit. The variations in ore properties which affect flotation from those assumed in the design criteria must therefore necessarily include grindability changes."This reflects important differences in Flotation Equipment characteristics between the two processes. Grinding circuits are built and designed with fixed total mill volumes and energy input, so the grinding intensity is not a controllable variable, instead grinding retention time is changed by variation of feed rates. In contrast, the flotation circuit is provided both with adjustable froth and pulp volume for variation of flotation intensity by aeration rate or hydrodynamic adjustment. Reagent levels and dosages provide a further means for intensity control."The Metplant ’13 conference started on July 14, with the GD Delprat Distinguished Lecture on Flotation given by Prof Graeme Jameson, Laureate Professor at the University of Newcastle, Australia, and one of the nominees to the International Mining Technology Hall of Fame. His lecture ‘Size matters- coarse and quick flotation can reduce costs’ discussed the everpresent need to reduce the costs of mining and milling operations. The greatest cost in ore concentration is the energy consumed in size reduction, particularly in grinding.Some progress has been made in reducing energy consumption in grinding, through better use of existing technologies, and the introduction of grinding methods such as HPGR. Flotation has promoted a wide scope of research activities ranging from fundamental chemistry and hydrodynamic studies to studies of industrial operations. In general, fundamental studies have been mainly related to ideal situations. In recent years, however, large efforts have been focusing on achieving a better insight into the actual sub-processes provided by the development of new and more sophisticated instrumentation. Since the massive incorporation of Flotation Machine columns, around 15 years ago, a renewed interest in flotation fundamental studies, process modelling and new cell designs have been observed worldwide. The key role of the froth has been recognized as an independent and sometimes rate limiting process step. Thus, separation of pulp and froth process stages seems the most appropriate in terms of process modelling, diagnostic, design and scale-up purposes.
  5. Computational domains of Flotation Equipment are large, and flow physics are complex involving multi-phase flow turbulence. Even two-phase flow simulations of flotation machines are time consuming and require large computational resources. Some approaches have been used to reduce computational costs for two-phase flow; see, for example, the approach by Tiitinen et al., where sector based simulations were used to reduce the number of grid nodes. Bubble size is one of the most important parameters that affect the air holdup of the pulp phase. A spectrum of bubble sizes exists in flotation machines depending on air flow rate and turbulence parameters. To predict such bubble size distribution, another set of equations that describes a population balance can be solved in the course of CFD simulation. This approach increases the computational demands where transport equation for each size group has to be implemented. A more feasible approach is to conduct a parametric study for different uniform bubble sizes to study their effects on air holdup and rate constant. Phosphate is a typical oxide ore characterizing that generating abundant froth during flotation. In this research a new Flotation Machine was employed in the flotation of phosphate. Comparing to regular flotation machine, in the reverse flotation of dolomite the recovery and grade of MgO has no significance improvement. While, in the case of reverse flotation of silicon dioxide, the new flotation machine has significance advantage. In 5 minutes of flotation time, the yield of froth is 20.66% with new machine, which equals to yield using regular machine under 8 minutes. The flotation time has been shorten by new machine. In addition, the recovery of silicon dioxide improved by 6% and the grade of silicon dioxide in phosphate concentrate decreased by 1.3% comparing the regular flotation machine. The results demonstrate that new flotation machine is more suitable and efficient for phosphate flotation
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