Method for controlling content of silicon tetrachloride in fused salt chlorination process of high titanium slag

Abstract

The invention provides a method for controlling content of silicon tetrachloride in fused salt chlorination process of high titanium slag, comprising the following steps of: introducing a graphite electrode into a fused salt chlorination furnace, connecting the graphite electrode with an electric furnace transformer, filling multi-component fused salt in the fused salt chlorination furnace, then adding high titanium slag, petroleum coke and chlorine, controlling the secondary voltage of the electric furnace transformer to be 20-50v and the output current to be 500-3500A, measuring the fused salt current for every 1-2h, obtaining the relation among the operating time of the fused salt chlorination furnace, and the fused salt current and the mass content of the high titanium slag in the fused salt; sampling the fused salt in the furnace during the production process, analyzing data and obtaining the mass content of SigmaTi and C, and controlling the mass content of SigmaTi at 1-3% and the mass content of the C at 2-7% by regulating the addition quantity of the high titanium slag and the petroleum coke and observing the current change of the fused salt. The method can ensure the stability of silicon tetrachloride content in titanium tetrachloride products during fused salt chlorination production, ensure that the silicon tetrachloride content in the titanium tetrachloride is below 0.18%, and also ensure the long-term and stable production of the fused salt chlorination furnace.

Description

technical field [0001] The invention relates to the process control of a molten salt chlorination furnace, a main reaction device in a molten salt chlorination production process, in particular to a method for controlling silicon tetrachloride content in a high titanium slag molten salt chlorination process. Background technique [0002] At present, large-scale molten salt chlorination production systems have been industrialized in China. In the molten salt chlorination production, the molten salt chlorination furnace is used as the main reaction generating device, and its function is that the high titanium slag is in the molten salt medium, and under the condition of the presence of the reducing agent (carbon), the chlorine gas converts the titanium in the high titanium slag Oxides and other oxides are chlorinated to chlorides. At present, there are no effective measures for the process control of silicon oxide chlorination, so that the content of silicon tetrachloride in ...

AI Technical Summary

Problems solved by technology

More impurity oxides in high titanium slag, such as calcium and magnesium oxides, are separated from the product titanium tetrachloride during the production process, and silicon chloride enters the product, causing serious damage to the purification of titanium tetrachloride products. It has caused great difficulties, so that the molten salt chlorination furnace cannot run stably for a long period of time during the production process of molten salt chlorination, especially causing difficulties for the subsequent production of titanium dioxide

Images