Method for reducing radioactivity of red mud

Abstract

The invention discloses a method for reducing radioactivity of red mud, in which barium sulfate powder is added into the red mud and then mixed together; after being milled by a ball miller, the limeis added into the mixture, then mixed and milled again to obtain construction material which can be directly used. The invention has the advantages that: the barium sulfate powder is added into the red mud to effectively reduce the radioactivity of the red mud; when the red mud is determined to use as the construction material, the radioactivity can not exceed the national standard. The barium sulfate powder and the red mud are mixed to immediately reduce the radioactivity of the red mud by 10-20 percent; through precipitating for 8-12 hours, the radioactivity of the red mud is further reducedby around 20 percent; the construction material of the red mud prepared at last is detected and the radioactivity is between 0.4-0.8 percent which is below the national standard. Compared with priorart, the invention has the advantages of effectively reduce the radioactivity of the red mud , simple preparation process, low production cost and so on.

Description

technical field [0001] The invention relates to a method for reducing red mud radioactivity, and belongs to the technical field of red mud recycling. Background technique [0002] Red mud is an industrial solid waste discharged after refining alumina from bauxite. Generally, it contains a large amount of iron oxide, and its appearance is similar to red soil, hence the name. Physical properties of red mud: particle diameter 0.088-0.25mm, specific gravity 2.7-2.9, bulk density 0.8-1.0, melting point 1200-1250°C. To produce 1 ton of alumina, 0.6 to 2.0 tons of red mud must be discharged. Because red mud contains harmful substances such as alkali and is also radioactive, it has not been well utilized. Although there are some technologies that use red mud to make fired bricks and unburned bricks, such as Chinese patent 92104133.0 discloses a red mud composite brick and preparation methods, but in the prior art, there is no good solution to the radioactivity of red mud. The ra...

AI Technical Summary

Problems solved by technology

Because red mud contains harmful substances such as alkali and is also radioactive, it has not been well utilized. Although there are some technologies that use red mud to make fired bricks and unburned bricks, such as Chinese patent 92104133.0 discloses a red mud composite brick and preparation methods, but in the prior art, there is no good solution to the radioactivity of red mud

The radioactivity of products made of red mud cannot be controlled or reduced. If too much red mud is added, or the radioactivity of the red mud material used is relatively high, the radioactivity of the obtained red mud composite brick will exceed the national standard, so the use effect not ideal