Method for extracting silicon and multi-metal products by activating red mud

The invention relates to the technical field of extraction of minerals from activated red mud, and provides a method for extracting silicon and multi-metal products from activated red mud, which comprises the following steps: uniformly mixing red mud, coal gangue and calcium carbonate in proportion; crushing and grinding the mixed material, and then carrying out hot roasting activation; continuously grinding the activated material into powder; carrying out magnetic separation on the ground material, and carrying out acid dissolution treatment on non-magnetic slag; carrying out solid-liquid separation on the acid-dissolved material to obtain a white carbon black solid and a multi-metal ion mixed solution; and the multi-metal ion mixed solution is separated step by step by controlling the pH value, and a plurality of metal products are obtained. According to the method, the magnetism of iron-containing minerals in the red mud is improved by utilizing a collaborative roasting reduction activation method, and two