Method for producing baked bricks from alumina red mud

Abstract

The invention discloses a method for producing baked bricks from alumina red mud. The baked bricks are prepared from the following raw materials in part by weight: 60 to 65 parts of red mud, 20 to 25 parts of coal cinder or flyash and 13 to 15 parts of coal gangue. The method comprises the steps of: 1, crushing the coal cinder or the flyash and the coal gangue until the fineness reaches 3 millimeters; 2, mixing the obtained substance and the red mud, conveying the mixture to a double-roll crusher for fine crushing until the fineness reaches 3 millimeters, and conveying the crushed mixture to a stirrer, and mixing and stirring by adding water in an amount accounting for 2 to 3 percent of the weight of the materials; 3, putting the obtained substance into a material containing tank for standing and aging; 4, putting the aged material into the stirrer, adding the water in an amount accounting for 1 to 2 percent of the weight of the aged material for mixing and stirring, feeding the mixed material into a vacuum brick extruding machine to extrude mud strips, and conveying the prepared air bricks to a drying room for drying; and 5, conveying the dried air bricks to a tunnel kiln for sintering, and performing natural cooling to obtain the baked bricks. The method has the advantages of realizing the regenerative utilization of the industrial solid waste red mud, saving cultivated land, solving the problem of the pollution of the red mud on environment, and reducing the energy consumption in the process of producing the baked bricks.

Description

technical field [0001] The invention relates to sintered bricks, in particular to a method for producing sintered bricks from alumina red mud. Background technique [0002] Red mud, also known as 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. But some are brown or even off-white because they contain less iron oxide. In the process of refining alumina, 0.2-0.6 tons of red mud must be discharged to produce 1 ton of alumina. Because red mud contains harmful substances such as alkali, it seriously pollutes the environment. At present, red mud is mostly discharged on land, which not only occupies farmland, pollutes water systems, but also pollutes the atmosphere after being blown by the wind after drying. In order to reduce pollution, it is required to lay an impermeable layer at the bottom of the red mud pile, and plant plants...

AI Technical Summary

Problems solved by technology

Because red mud contains harmful substances such as alkali, it seriously pollutes the environment

At present, red mud is mostly discharged on land, which not only occupies farmland, pollutes the water system, but also pollutes the atmosphere after being blown with the wind after drying.

Images