Method for manufacturing lightweight porous sintered material from red mud and plant residues

Abstract

The invention relates to a method for preparing a light porous sintering material by red mud and plant residues. The method comprises the following steps: by using the red mud with the water content being less than or equal to 65wt% and the plant residues with the water content being less than 70wt%, preparing and mixing materials; rolling and mixing; moulding; and sintering to obtain the light porous sintering material. The method which utilizes waste red mud and plant residues wide in source and large in output can produce serial products such as water permeable paving products, filtering products, products for sound absorbing materials, catalytic products, light panels or heat-insulating and sound-proofing bricks which are wide in purpose and high in value with low cost. The method has industrial competitiveness and good investment economical benefit. Meanwhile, not only are a lot of clay resources and non-renewable fuel coal as building materials and chemical product raw materials saved to realize industrial emission reduction of Co2, but also the pollution of waste pollutants red mud and plant residues to water, soil and air can be effectively solved, and secondary disasters are prevented.

Description

technical field [0001] The invention relates to a method for manufacturing light porous sintered materials, in particular to a method for manufacturing light porous sintered materials by using industrial waste red mud and plant residues. Background technique [0002] Red mud is a very fine-grained strong alkaline solid waste produced during the process of extracting alumina from bauxite. For every ton of alumina produced, about 0.8 to 2 tons of red mud are produced. The red mud produced according to different extraction processes is called Bayer red mud, sintering red mud and combined red mud. The physical properties of red mud are: particle diameter 0.088-0.25mm, specific gravity 2.7-2.9, bulk density 0.8-1, melting point 1200-1250°C. The mineral composition of red mud is complex, the main minerals are aragonite and calcite, the content is 60-65%, followed by opal, gibbsite, goethite, and the smaller content is titanium ore, siderite, trona, water glass , sodium aluminate...

AI Technical Summary

Problems solved by technology

[0008] 2. Chemically combine ceramic composite materials, use red mud dry powder after removing impurities, drying, and grinding to replace part of the porcelain mud materials, and prepare ceramic composite materials. The energy consumption of removing impurities, drying, and grinding is high. The characteristics and fluctuations of the chemical composition of mud make it difficult to control the color, strength and yield of ceramics, resulting in a substantial increase in the cost of qualified products

[0009] 3. Insulation and refractory materials: replace part of the refractory mortar with the red mud after removal of impurities, drying and grinding to burn refractory materials, or use red mud powder, refractory lightweight aggregate and refractory mortar that have been treated with removal of impurities, drying and grinding Add foaming agent to roast to produce thermal insulation refractory material, because the melting point of red mud itself is relatively low, and the energy consumption of removing impurities, drying and grinding is relatively high, but no substantial breakthrough has been made

These technological methods not only waste limited natural resources and increase environmental pollution, but also cause high cost and limited application.