Method for preparing inorganic artificial stone by using tailings from iron separation from red mud

Abstract

The invention discloses a method for preparing inorganic artificial stone by using red mud iron dressing tailings, which comprises the following steps: grinding Bayer process red mud in a ball mill, uniformly mixing with water to obtain slurry, carrying out magnetic separation on the slurry to obtain a non-magnetic component and a magnetic component, drying the magnetic component to obtain iron-containing ore, and drying the iron-containing ore to obtain the inorganic artificial stone. Filtering the non-magnetic components to obtain red mud iron separation tailings; then, quantitatively weighing raw materials such as inorganic filler aggregate, red mud iron dressing tailings, cement, water and auxiliaries; the preparation method comprises the following steps: uniformly mixing the inorganic filler aggregate and the red mud iron dressing tailings, sequentially adding the cement, the auxiliary agent and the water, uniformly mixing and stirring, directly feeding into a mold, carrying out vacuum vibration compression molding to obtain an uncured artificial stone block, and curing and curing the artificial stone block to obtain the artificial stone containing the red mud iron dressing tailings. The red mud iron dressing tailings are used for producing the inorganic artificial stone, so that the utilization rate of the red mud iron dressing tailings is increased, and the production cost of the inorganic artificial stone is reduced.

Description

technical field [0001] The invention belongs to the technical field of inorganic artificial stone production, and in particular relates to a method for preparing inorganic artificial stone by utilizing red mud iron beneficiation tailings. Background technique [0002] Red mud is the solid waste generated during the production of industrial alumina. In the alumina production process, about 0.8-1.5 tons of red mud is produced for every ton of alumina produced. For example, Pingguo, Guangxi has proven reserves of 290 million tons of bauxite. Currently, more than 6 million tons of bauxite are mined, 2.4 million tons of alumina are produced, and the annual by-product of red mud is more than 3 million tons. Most of the by-product red mud is high-iron diaspore type Bayer process red mud, and its main mineral phases are hematite, goethite, calcite, hydrated garnet, diaspore, gibbsite and calcium Nepheline, etc., among which iron-containing minerals such as hematite and goethite ar...

AI Technical Summary

Problems solved by technology

However, the smelting of alumina and aluminum hydroxide by the Bayer process uses strong alkali to dissolve, and the red mud produced by the Bayer process hardly contains active components such as 2CaO·SiO2, and the wet magnetic separation method is currently used Recycling iron makes the red mud iron beneficiation tailings contain a lot of water, so the application advantages of Bayer red mud in cement, ceramics and other industries are not obvious, resulting in the comprehensive utilization rate of these red mud is only 13% to 15%, a large number of Red mud has not been fully utilized, and it occupies a large amount of land for a long time, causing environmental pollution and endangering human health. Therefore, it is urgent to develop a high value-added comprehensive utilization method for red mud

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