Red-mud-based sintered light aggregate and preparation method thereof

Abstract

The invention discloses red-mud-based sintered light aggregate and a preparation method thereof and belongs to the technical field of industrial solid waste comprehensive utilization and novel ecological building materials. The red-mud-based sintered light aggregate is prepared from, by weight, 40-80 parts of red mud, 10-30 parts of coal ash, 5-30 parts of coal gangue, 0-20 parts of silica fume, 10-20 parts of alkylating agent, 5-30 parts of nitration agent, 30-60 parts of carbonaceous pore forming material and 10-30 parts of pelletization adhesive. The red mud is on the basis of the weight of a dry base. The red mud, the coal ash, the coal gangue, ganister sand and other industrial solid waste are adopted in the main raw materials, and eco-environment friendliness is achieved. A compound performance modifier formed by the alkylating agent and the nitration agent can be matched with a proper baking process, the radioactivity of the red mud can be effectively restrained, and the solid caustic soda effect is achieved. The overall preparation process is simple, existing equipment can be utilized for production, cost is effectively reduced, and large-scale consumption of the red mud is achieved.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of industrial solid waste and new ecological building materials, and in particular relates to a red mud-based sintered light aggregate and a preparation method thereof. Background technique [0002] The red mud stockpile is large and the utilization rate is low. In 2005, the production of red mud in my country was 10 million tons, and in 2010, it was 30 million tons. It is estimated that the production will reach 35 million tons in 2015, and the cumulative stockpiles will reach more than 300 million tons. The rapid development of electrolytic aluminum, alumina and other related industries has led to a continuous increase in the accumulation of red mud, causing serious ecological problems such as groundwater, soil pollution, smog, and radioactivity exceeding the standard. Regrettably, the comprehensive utilization rate of red mud in 2010 was only 4% of the output in that year, and the util...

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Problems solved by technology

[0003] At present, the research on the comprehensive utilization of red mud mainly focuses on the extraction of valuable metals, the use of environmental restoration materials, engineering plastic fillers, and the production of sintered bricks. Restoration will cause secondary pollution, pan-alkali phenomenon in the production of fired bricks, etc.

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