Reductive roasting is at a temperature below the melting point of the charge and reducing atmospheric conditions, so that the metal oxide ore is converted to the corresponding process low valent metal oxide or metal. The reduction of metal oxides can be expressed by the following formula: Wherein M() - metal oxide; R, RO - reducing agent and reducing agent oxide. Any substance having a chemical affinity for oxygen greater than that of the reduced metal to oxygen can be used as a reducing agent for the metal oxide. At higher temperatures, carbon can act as a reducing agent for many metal oxides, and the reducing agents commonly used in production are solid carbon, carbon monoxide gas, and hydrogen. The reduction roasting is mainly used for the treatment of refractory mineral raw materials such as iron , manganese , nickel , copper , tin and antimony . In addition, it is also used for the removal of impurities and coarse concentrates in concentrates. For example, nickel-bearing laterite ore is the world's largest nickel oxide ore resource. Because of its low grade, nickel is chemically impregnated. At present, it cannot be enriched by physical beneficiation . The nickel is recovered by reduction roasting-low pressure ammonia leaching. Get industrial applications. The nickel oxide is previously reduced to an active metal nickel, a cobalt- nickel alloy, and then nickel is recovered by ammonia leaching. Selective reduction roasting of a common gas reducing agent (CO-CO2, H2-H2O), the main reaction is: If the controlled gas phase composition CO2/CO is greater than 2.53 or H2O/H2 is greater than 2.45, the nickel cobalt oxide can be preferentially reduced to metallic nickel or cobalt; most of the oxidation is reduced to magnetite without generating metallic iron. However, since the bonding state of the metal oxide in the ore is complicated and the reaction speed is increased, the gas phase composition ratio should be smaller. When the gas phase composition is controlled at CO2:CO=1:1, a small amount of ferrous oxide and metallic iron are inevitably formed. The reduction of roasting nickel-containing laterite ore is generally carried out in a multi-layer roasting furnace, and a rotary kiln can also be used. 1. Simple exploration of mineral processing test - before the purchase of mineral rights, meet the investment analysis and reduce the initial value assessment of investment risk. 2. Feasibility test of ore - It is used for detailed geological analysis and analysis, to meet the evaluation certificate, and to determine the reasonable process and reasonable process indicators. 3, system process test - practically used before the construction of the plant, meet the design finalization, find the law to determine the best process indicators. 4, technical research and research - the use of mine disaster technology is unsolved, to meet the improvement of efficiency, product failure to recover low cost and high time. 5, process flow verification test - the actual use of ore properties comparison, to meet the choice of pharmaceutical plants, the mine has different ores to determine the adaptability. 6, process flow test - practically used to produce the factory, to meet the current factory investigation, the selection of factory physical examination analysis and plant selection. 1, determine the type of ore ---- need to do spectral analysis and rare element test. 2, to identify the specific nature of the ore - need to do multi-element analysis to determine the content of valuable and harmful elements. 3, to find out the relationship between minerals in the ore, content and composition - the need to do rock ore identification has important guiding significance for mineral processing. 4. Determine the specific existence form and distribution of elements in the ore. It is necessary to do phase analysis and have guiding significance for mineral processing. 5, concentrate, tailings test --- need to do valuable elements and harmful elements. 6, the original ore and concentrate water, the proportion of ore is determined - the actual measurement of mineral processing. Brushless Kayak Motor,Brushless Trolling Motor,Brushless Electric Boat Motor,Brushless Electric Trolling Motor Ningbo Haishu Hongkang Outdoor Industry & Trade Co., Ltd , https://www.hktrollingmotors.com