Chlorination roasting is a process in which a chlorinating agent is used to convert a target component in a mineral raw material into a gas phase into a phase of agglomerating phase under a certain temperature and atmosphere to separate and concentrate the target component. According to the product form, it can be divided into three types: high temperature chlorination roasting. 1. High-temperature chlorination roasting High-temperature chlorination roasting produces chloride which is volatilized by gas, also known as high-temperature chlorination. 2. Medium-temperature nitriding roasting The intermediate chloride chlorination calcination produces a chloride which is substantially solid in the calcine. Then allowed by leaching into solution, also known as chlorination roasting - Leaching: Third, this method is that the isolation process was volatilized chloride component object while leaving the metal oxide is reduced and precipitated in a metallic state And then recovered by physical beneficiation . In addition, according to the oxygen content in the gas phase, it can be further divided into oxidative chlorination roasting (direct chlorination) and reduction chlorination roasting (reduction chlorination). Reduced chlorination is mainly used to treat materials that are more difficult to normalize. For chlorination roasting, a gas chlorinating agent (C1 2 , HCl) or a solid chlorinating agent (NaCl, CaCl 2 , FeCl 3 ) may be used, and the chlorination reaction of the gas phase chlorinating agent is: 1 MO+Cl 2 ==== MCl 2 + ——O 2 2 1 MS+Cl 2 ==== MCl 2 + ——S 2 2 MO+2HCl ==== MCl 2 +H 2 O MS+2HCl ==== MCl 2 +H 2 S Many metal sulfides are more easily chlorinated by chlorine gas, so chlorine is most preferred as a chlorinating agent for most metal sulfides, but at high temperatures, sulfides are chlorinated with hydrogen chloride. In addition to gaseous chlorinating agents, sodium chloride and calcium chloride are commonly used in the industry as solid chlorinating agents. The chlorination of solid chlorinating agents is mainly achieved by decomposing other components to obtain chlorine gas and hydrogen chloride. The main factors affecting chlorination roasting are temperature, chlorinating agent type and amount, gas phase composition, gas flow rate, material particle size, porosity, material mineral composition and chemical properties, and catalysis. Currently chlorination roasting process has been applied to pyrite cinder - high titanium slag, nickel-depleted ore, laterite ore, tin lean ore, gold and complex depleted of tin. The calcination process can be carried out in a multi-guard, shaft furnace, rotary kiln or crucible furnace. In addition to the chlorination roasting process, chlorination segregation is one of the effective methods for treating certain refractory ores.
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