Introduction to vanadium extraction from stone coal Stone coal is a kind of inferior saprophytic anthracite which exists in the ancient strata such as the Sinian, Cambrian, and Silurian. It is formed in the shallow sea under reduced conditions after the lower organisms of the algae die. China's Hunan, Hubei, Henan, Anhui, Shaanxi, Yunnan, Yunnan and other places rich in vanadium-bearing coal, the country's proven vanadium-bearing coal reserves of 6l8.8x10 8t, its V2O5 grade is between 0.1% -0.5%, total The amount of vanadium is 1.18×108t, accounting for 87% of China's total V2O5 reserves, exceeding the total reserves of vanadium in other countries and regions of the world. Among them, the industrial exploitation value (V2O5 content above 0.8%) reaches 8×106t. The material composition of vanadium-bearing coal is complex and variable. The vanadium occurrence and valence state are varied and scattered. X-diffraction is generally difficult to clearly and accurately identify the mode of occurrence. The method of mineral processing cannot be used. Enrichment. The valence state analysis of vanadium in stone coal shows that most of the vanadium in stone coal is present in V3+ form in silicate minerals such as vanadium-containing mica , tourmaline and garnet, and is partially replaced by the isomorphic form. Al3+ in the siloxane tetrahedral "mesh layer" and the aluminoxy octahedral "single mesh layer". Stone Coal may also form a mineral vanadium garnet titanium vanadium, calcium vanadium garnet, vanadium, uranium and other variants; may also exist metal complexes and organic vanadium porphyremia form, may also form a complex anion was adsorbed the mixture present in the iron oxide, clay minerals. The Institute of Metallurgy of Hunan Nonferrous Metals Research Institute is one of the earliest research institutes for the research of vanadium extraction from stone coal in the country. In the late 1970s and early 1980s, vanadium-bearing coal from Yueyang Xinkai and Hubei Tongshan was carried out. Detailed process research and factory production. Since the beginning of the new century, especially in the past two years, with the surge in the price of vanadium pentoxide in the international and domestic markets (the price of powdered V2O5 in the international market of 98% rose from 3.3 US dollars/kg at the beginning of 2003 to the highest in April 2005). 66 US dollars / kg, the domestic market price also rose from 35,000 yuan / t to a maximum of 330,000 yuan / t), and locals have set off a wave of building vanadium. Due to the increasingly strict environmental protection requirements of the country, it is strictly forbidden to exhaust the exhaust gas of HC1, C12, SO2 and other corrosive gases that cause serious pollution to the surrounding environment. Since 2005, the State Environmental Protection Administration has intensified the rectification of the small vanadium plant, shutting down and frying. The small vanadium smelting plant using NaC1 as an additive was destroyed. For example, Hunan Guzhang had destroyed five illegal vanadium plants by the end of June 2005. Xiangxi Autonomous Prefecture closed 31 small vanadium plants and 45 rectification; Yueyang concentrated in mid-July. More than a dozen refinery plants have been banned; similar remediation actions have been carried out in Hubei, Henan and Shaanxi provinces. Therefore, the search for new technologies and new processes for the control of vanadium without pollution or pollution is a top priority for many investors. Gemel Mount Trolling Motor, Gemel Mount Trolling Motors, Foot Control Trolling Motors, Small Boat Motors, Bass Boat Trolling Motors Ningbo Haibo Group Co.,Ltd. , http://www.hbtrollingmotors.com