Method for recovering iron and titanium from high-iron high-titanium red mud and carrying out direct cementation

Abstract

The invention provides a method for recovering iron and titanium from high-iron high-titanium red mud and carrying out direct cementation. The method includes the following steps that (1), the raw material, namely the high-iron high-titanium red mud treated with a carbonization-carbonization method is prepared; (2), a dewatered raw material is obtained after drying; the dewatered raw material, a solid-state carbonaceous reducing agent and a slagging former are mixed into a mixture, the mixture is spray-blown to the vortex center of a vortex stirring high-temperature furnace, and vortex stirring reducing is carried out; (3), molten iron formed after reducing is separated from titanium-containing molten slag; ferrochromium and ferromanganese are added into the molten steel, and a wear-resistant cast iron product is prepared; and (4), titanium-containing components in the titanium-containing molten slag are enriched to form a titanium-containing phase, and the titanium-containing phase isseparated from residual slag; the components of the residual slag are adjusted, so that the residual slag meets the requirements of cement clinker, and breaking and grinding are carried out. By meansof the method, iron and titanium can be comprehensively recovered, the recovery rate of titanium can reach 60% or above, and the utilization rate of the red mud reaches 100%.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for recovering iron and titanium from high-iron and high-titanium red mud and directly cementing it. [0002] technical background [0003] Red mud is a strong alkaline solid waste produced by producing alumina or aluminum hydroxide from bauxite. At present, the global red mud reserves are estimated to have exceeded 3 billion tons, and the annual growth rate is about 120 million tons. The average utilization rate of red mud in the world is 15%. The accumulative stockpiling of red mud in China has grown to 600 million tons, and the annual growth rate is about 100 million tons, and the utilization rate of red mud in China is only 4%. Most of the red mud is still disposed of by land storage. The stockpiling of red mud not only wastes secondary resources and occupies a large amount of land, but also destroys the surrounding environment of the red mud stockp...

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Problems solved by technology

[0007] When red mud is used as a general industrial raw material as a whole, there are problems such as red mud alkali restriction, low product price, and poor income; most of the methods for separately extracting valuable elements have too long treatment process, large amount of waste water, and tailings cannot be obtained Utilization and other issues; "A method of absorbing red mud" (application number: CN201110275030.X) invented by Zhang Ting'an et al. mixes Bayer process red mud with slaked lime, and after calcification and dealkalization, introduces CO into the container 2 Obtain carbide slag whose main components are calcium silicate, calcium carbonate and aluminum hydroxide, and finally use sodium hydroxide solution or sodium aluminate solution to extract aluminum hydroxide, and change the structure and composition of red mud through calcification transformation and carbonization transformation, so as to obtain Calcified-Carbonized Red Mud with Calcium Silicate and Calcium Carbonate as Main Phases

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