A kind of red mud-based sintered lightweight aggregate and preparation method thereof

Abstract

A red mud-based sintered light aggregate and a preparation method thereof, which belong to the technical field of comprehensive utilization of industrial solid waste and new ecological building materials, and are composed of the following raw materials in parts by weight: 40-80 parts of red mud, 10-30 parts of fly ash , 5-30 parts of coal gangue, 0-20 parts of silica fume, 10-20 parts of alkylating agent, 5-30 parts of nitrating agent, 30-60 parts of carbonaceous pore-forming agent and 10-30 parts of granulated binder; , red mud is measured in parts by weight on a dry basis. The main raw materials of the present invention are industrial solid wastes such as red mud, fly ash, coal gangue, silicon powder, etc., which are ecological and environmentally friendly; the composite performance regulator composed of alkylating agent and nitrating agent can effectively inhibit the red mud from decomposing when combined with a suitable roasting process. Radioactivity and alkali-fixing effect; the overall preparation process is simple, and existing equipment can be used for production, which effectively reduces costs and realizes large-scale consumption of red mud.

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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