Brown iron ore reserves are large, but because of the low value of its refined gold mining and metallurgy in the world market and a variety of magnetite and hematite have enough choice, so in other countries, not brown iron ore sorting It has been widely promoted. In most other countries, the production of limonite ore raw materials is shrinking, while some mining companies are temporarily suspended or closed. Although the production of the brown ore concentrate in the West German Lololin Iron Mine and the French in the 1960s was relatively large, there were no reports on the production of these enterprises between 1987 and 1984. Therefore, the information on the practice of limonite ore dressing is quoted from the earlier literature, but it is also reliable, because the exploration of the potential of limonite ore dressing has not changed the applied process. The characteristics of the limonite ore are revived by the Soviet Union's limonite ore. The main metal minerals are limonite, hydrohematite and goethite, and non-metallic minerals are silicate cements. The ore of the Kremykov deposit is somewhat different from this type of ore. In addition to limonite, it also includes siderite or hematite. In克列米科夫deposit also contains a lot biotite, pyrite, copper ore, barite, lead jarosite. This can be considered as a composite ore because it contains the following associated components: BaSO4-16~18%; Pb-0.6-0.8%; Mn-6-8%. The content of phosphorus and manganese in the limonite ore is relatively high, and up to 6% of the harmful impurities in the ore are 1.5%. Most limonite ore contains a lot of clay . Limonite ore is most commonly used in smashing , roller or impact crushers for one to three stages of crushing and sieving. The crushing process is characterized by repeated days and days to prevent the crusher from becoming clogged. According to the next beneficiation method, it is broken to 100 to 25mm. Screened products are usually sent to de-sludge and then re-selected or used as a qualifying product. The ore dressing mainly adopts the re-election method. The most commonly used in these processes are beneficiation, jigging and resuspension. Washing is one of the main operations because it contains a lot of clay in the ore. The Lone Star Steel Company's concentrator uses a pure washing process. The ore processing process stipulates that the ore is inspected and screened. The product on the sieve was further crushed to 100 mm; the 38-0 mm and 100-38 mm pellets were separately washed, the coarse particles were broken to 38 mm, and three stages of washing were carried out. Since the ore is bonded by the clay material, it is washed by a blade type washing machine. The washing machine overflows and dewaters the grading overflow into the tailings of the washing plant. The Iridaid-Pyeniere concentrator also works in a single-line pure washing process, for which a washing tower is installed at the factory. The washing ore has a particle size of 50 (30) to 0 mm. A 0.4 mm tailings and clay block was separated from the cleaned ore, which was separated by a trommel and a washing screen. Despite the enhanced washing method, the process indicators of the concentrator have not been significantly improved. The ore dressing process at the Zarzgitter-Kabehite concentrator is relatively complete, with ore washing and sorting of ore in a sub-suspension with a density of 3100 kg/m3. The Matezanki Concentrator uses the most modern limonite ore dressing process. The process of the concentrator is required to carry out three-stage crushing, and the ore is dried to a moisture content of 0.5% by a drum dryer. After the ore is dried, it is further crushed to 15-0 mm in a hammer crusher , and then subjected to wind classification at a particle size of 0.315 mm. The coarse fraction was broken again to 10-0 mm and the wind was graded again. Products having a particle size of 10 to 0.315 mm are used as building materials, and products having a particle size of 0.315 to 0 mm are subjected to wind classification at a particle size of 0.04 to 0 mm. The granular product (0.315-0.044 m) is fed into a roller magnetic separator with a magnetic field strength of 1300-1600 ampere/m, and three times of dry magnetic separation is performed to select a finished concentrate with an iron grade of 42% and an iron grade of 12 % of abandoned tailings. The obtained concentrate is combined with the wind classification product (0.04 to 0 mm) and sent to the sintering. The iron recovery of the concentrate is 85 -90%. Kremykov Steel is the largest mining company to process limonite ore by roasting magnetic separation process. Ore crushed to 20 to 0 mm, and then the tubular rotary kiln with coal in a blast furnace gas fired. The ore is cooled in a spiral classifier. The lignite used for ore reduction accounts for 7 to 8% of the ore weight. After cooling, the yield of the calcined product is 62-65%, and the moisture content is 11-13%. Due to the elimination of volatiles and low iron grade (21-25%) roasting dust, the iron grade is increased by 5-7%, while the ore is mined. The dust yield is between 10 and 14%. Flotation of the collected ore dust can obtain a barite concentrate containing 55 to 56% of cerium and a recovery of about 12%. One of the main difficulties encountered when selecting the Klelimkov ore was the production practice of the lead-free Klimkov Co., Ltd. roasting magnetic separation plant. When roasting, only 25-30% of the lead can be excluded from the dust. The calcined ore having a reduction ratio of 80 to 100% is ground in a ball mill which is closed with a classifier. -0.074 mm grade 66-72% grader overflow for magnetic separation to select finished concentrate and tailings. When the yield is about 70%, the concentrate iron grade is 49 to 49.5%. Dewatering and filtration of limonite concentrates is a simple process using a concentrator, belt and flat filter. The return water supply is mainly realized by the tailings pond, because the fine-grained mud iron ore tailings are not easy to precipitate. 6.5 Inch Hoverboard, 7inch hoverboard, self-balancing electric scooter Ningbo Sunhon International Co., Ltd. , https://www.scooterelectricadult.com