In recent years, due to the advancement of science and technology, tin and beneficiation processes at home and abroad have made certain progress, and the level of mineral processing in various countries has increased. Among them, the application of various joint processes, including the combined process of smelting and smelting, heavy medium pre-selection, flotation, prevention of over-grinding, fine mud sorting, concentrate processing, tailings re-election and comprehensive recycling, etc. However, the efficient processing of tin ore in countries around the world still faces many challenges. With the continuous development and utilization of tin resources, the grade of minable tin deposits is getting lower and lower, especially for some large and medium-sized deposits, which increases the difficulty of tin ore dressing and the cost of ore dressing. Tin ore, which is in the form of fine-grained and fine-grained grades, is an important target for tin recovery. At the same time, tin ore is brittle and produces a large amount of fine-grained cassiterite and tin ore during the grinding process. This has caused a real problem of poor re-election efficiency, large consumption of flotation chemicals and poor flotation indicators. How to reduce the negative impact of ore fineness is an important factor to improve and improve the effect of tin ore flotation. Although the researchers have developed technologies such as carrier flotation, flocculation flotation, and dissolved air flotation for the characteristics of fine-grained cassiterite, the industrialization road needs further advancement. Process mineralogy found tin cassiterite many state distributions in the form of ions in the lattice of the mineral ore or the like magnet substituted with other atoms or tin atoms present in the internal tin minerals, causing difficult separation of tin and other elements, also limits the lead, zinc, copper, bismuth, tungsten, molybdenum and other associated integrated with a recovery of valuable metals. Re-election and flotation are still the most important methods for processing tin ore. However, for tin ore with different properties of different deposits in different regions, the re-election index is restricted by the lower limit of sorting size, small amount of treatment and large water consumption; flotation The indicators are constrained by factors such as large consumption of chemicals, high operating costs and environmental pollution. At the same time, the degree of automation of tin ore beneficiation needs to be further improved. As resources continue to be consumed, the recycling of secondary secondary resources is becoming more and more important. In developed countries such as Japan, the United States, and Germany, the recycling process of waste tin is relatively high, and reclaimed tin can account for 20%–60% of its total consumption. But overall, tin consumption is large worldwide, and the level of recycled tin processing needs to be improved. In addition, the challenges faced by tin beneficiation include environmental factors. With the increasing awareness of environmental protection among humans, the non-waste discharge and harmless treatment of tin ore dressing plants and the lead-free process in tin soldering are gaining more and more attention. In the future, for the characteristics of low grade, intricately embedded, complex symbiosis and the problems faced by tin ore mining, the joint process is still the mainstream trend of tin processing in the future; from a single process to heavy, floating, magnetic, The joint process transition of electric multi- mineralization technology has a good application prospect from the recovery of single tin concentrate products to the comprehensive recovery of various useful concentrate products. The development of new technologies, new equipment and new chemicals for tin ore beneficiation with low operating costs, low environmental pollution and wide application requires more in-depth research. Focusing on composite force field, isomerism principle, theoretical calculation and simulation, and various modern analytical testing methods, we have made breakthroughs in gravity equipment development, drug molecule design and synthesis, environmental friendliness and efficient use of resources to achieve tin beneficiation. Scientific and technological progress is the common responsibility and goal of mineral processing science and technology workers.
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Problems and development trends of tin ore beneficiation
The tin deposit types and ore properties of different countries are different, and the historical conditions and development conditions are different. Therefore, the tin beneficiation status of different countries is quite different.