Of depleted of chromium ore beneficiation, we have used jigger, shaker, spiral concentrator, centrifugal concentrator and belt chute sorting through all over the chromium depleted ore (Cr203 <20%), but also with the hydraulic tube sorter sorting Pass the shaker in the mine. Dry strong magnetic separation, wet strong magnetic separation, flotation and various chemical beneficiation methods were studied in the laboratory. However, in the actual production, the re-election method is mainly adopted, and individual mines adopt strong magnetic separation. Since 1967, China has built five small ore dressing plants in Zunhua, Beijing, Miyun, Shangnan, Inner Mongolia, Sauran, Inner Mongolia, and Salto, Xinjiang. The first three have been selected with the end of mining. Discontinued. The existing Solon Mountain plant was built in 1985. The designed scale has an annual output of 3,000-4,000 tons of concentrate powder, 25% of the ore grade, 40% of the refined grade after re-election, but the tailings grade is 10%. In 1986, it was put into production for the strong magnetic separation process. Currently our chrome ore smelting mainly Pyrometallurgy electric furnace method, followed by metal vacuum thermal reduction and carbon reduction and converter method. The electric furnace method is further divided into a mineral thermal method and a refining electric furnace method. The former carbon as reducing agent, chromium ore, coke, silica raw materials to produce high-carbon ferrochrome, silica or coke, the raw material for the production of high carbon ferrochrome sichrome; the latter using silica as a reducing agent, chromium ore , silicon chrome alloy, lime as raw material to produce medium and low carbon ferrochrome and micro carbon ferrochrome. It is also useful to produce medium and low carbon ferrochrome in a converter. Metal thermal reduction method commonly used as a reducing agent aluminum particles, chromium oxide vigorous reaction in a short time, emit large amounts of heat, melting the chromium. The vacuum carbon reduction method uses high-grade chromium ore (currently used high-carbon ferrochrome after oxidizing roasting) as an oxidant, and is made into agglomerates with high-carbon ferrochrome powder, placed in a vacuum furnace, and decarburized at a temperature lower than the melting point of the metal. , production of micro-carbon, ultra-fine carbon ferrochrome; or decarburization and nitrogen gas to produce nitrogen-containing ferrochrome alloy. Wet smelting is currently carried out by oxidizing roasting of chrome ore and soda ash and dolomite or limestone into a rotary kiln to form sodium chromate. After water immersion, sodium sulfide or sulfur is added to reduce it to chromium hydroxide precipitate, and dehydration calcination to obtain oxidation. Chromium is then produced by metal thermal reduction or vacuum carbon reduction and electrolysis. In addition to the above smelting methods, in recent years, China has studied the method of recovering chromium from Jinchuan copper- nickel tailings in Gansu, which uses oxidizing roasting to prepare chromium hydroxide, then chrome ammonium ruthenium, and finally metal chromium. The Chinese Academy of Sciences has also developed a new process for the extraction of chromium by primary amines. The extraction rate of chromium is 98% and the stripping rate is 100%. The purity of Cr203 products is 95%-98%, which provides a basis for the comprehensive utilization of the associated chromium in the Hongge iron ore of Panzhihua-Xichang area. Non-woven special equipment accessories
Non-woven fabric is a new type of modern material. It has a wide range of uses and can play more roles in clothing, agriculture and industry. The production of non-woven fabrics is also mostly mechanized, which makes it possible to produce a large number of non-woven fabrics in batches. Non-woven fabric winders are one of its equipment.
Non-woven fabric, also called non-woven fabric, is composed of oriented or random fibers. The production of non-woven fabrics often uses polypropylene pellets as raw materials, and is produced by a continuous one-step method of high-temperature melting, spinning, laying, and hot-pressing. In the production of non-woven fabrics, the raw materials need to be spun and formed and then processed. In the web-forming work, a non-woven web forming machine needs to be used. The web forming machine uses wind in the drafting duct to process the silk. After drafting, a machine for non-directional weaving into a net is carried out. However, polypropylene pellets are prone to broken filaments and stiff blocks during drawing, drafting, and web formation. Therefore, in order to improve the quality of the finished non-woven fabric, it is necessary to clean the formed non-woven fabric. When dealing with broken wires and stiff blocks in traditional web forming machines, workers usually use brushes or scouring pads behind the web forming machines to clean up. Because the belt width of the web forming machines is relatively long, and the conveyor belt speed is relatively high at the same time. Fast, the cleaning range that workers can cover is limited, resulting in low cleaning efficiency, which in turn affects the quality of the finished non-woven fabric.
The slitting machine is mainly used to cut large-format non-woven fabrics into multiple small non-woven fabrics of different widths for processing non-woven products. The equipment adopts DC speed regulation, feeding constant tension control, air knife slitting, rewinding pressure and other devices. The rewinding tightness after slitting is adjustable, and the slitting end surface is flat. The equipment is of high quality and beautiful appearance. It is the ideal equipment for the slitting of large non-woven fabrics. In addition, according to the needs of users, the equipment can also add a dummy cutting function, that is, the original fabric is dummy cut and then slit and rewinded.
Non-woven fabric machinery is a general term for the production of non-woven fabric products, and adopts an overall modular design with a compact and reasonable structure. The control part adopts advanced PLC microcomputer control, and the international famous brand frequency converter speed regulation.
Melt blown mold head, Cross forming machine, slitting machine, Non woven fabric winding machine, non-woven high-speed winding machine, non-woven high-speed web forming machine, Netting machine, polyester non-woven fabric sizing and drying equipment Changzhou Puyisen Machinery Technology Co., Ltd. , https://www.czsmmsmachine.com
Mineral processing and processing technology of chromium-poor ore