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A method for preparing lightweight wall bricks with red mud as the main raw material

A light-weight technology for wall tiles, which is applied in the production of clay products, ceramic materials, and other household appliances. It can solve the problems of low strength of lightweight ceramic tiles, limitations of large-scale industrialization of lightweight ceramic tiles, and inability to adapt to daily use, etc. problems, to achieve the effect of high matching, wide application and excellent performance

Active Publication Date: 2020-08-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strength of the lightweight ceramic tiles prepared by the current method is too low to be suitable for daily use, which limits the large-scale industrialization of lightweight ceramic tiles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This example uses red mud from a factory in Zibo, Shandong, whose main component is 20.61% SiO 2 , 27.76% Al 2 o 3 , 31.01% Fe 2 o 3 and 7.92% Na 2 O. Add CaO to the sodium silicate solution obtained by desiliconization of fly ash, and react in a hydrothermal reactor to obtain additive materials. The reaction conditions are: 250°C, and the reaction time is 0.5h. The green body formula used is: 40% red mud, 5% additives, 35% pyrophyllite, 5% bentonite, 5% albite feldspar and 10% potassium feldspar, after batching, ball milling, spray drying, aging to obtain powder and pressing. After forming, the green body is fired, cut and edged to obtain a wall brick product, and its bulk density is 1.58g / cm 3 , The modulus of rupture is 20.42MPa.

Embodiment 2

[0024] This example uses red mud from a factory in Zibo, Shandong, whose main component is 20.61% SiO 2 , 27.76% Al 2 o 3 , 31.01% Fe 2 o 3 and 7.92% Na 2 O. Adding Ca(OH) to the sodium silicate solution obtained from desiliconization of bauxite 2 , react in a hydrothermal reactor to obtain additive materials, the reaction conditions are: 80°C, and the reaction time is 10h. The green body formula used is: 60% red mud, 10% bentonite, 20% diopside, 10% pyrophyllite, ball milling after batching, spray drying, aging and pressing into powder. After forming, the green body is fired, cut and edged to obtain a wall brick product, and its bulk density is 1.60g / cm 3 , The modulus of rupture is 27.23MPa.

Embodiment 3

[0026] This example uses red mud from Zibo, Shandong, whose main component is 20.61% SiO 2 , 27.76% Al 2 o 3 , 31.01% Fe 2 o 3 and 7.92% Na 2 O. Adding Ca(OH) to the sodium silicate solution obtained from desiliconization of coal gangue 2 , react in a hydrothermal reactor to obtain additive materials, the reaction conditions are: 95°C, and the reaction time is 5h. The green body formula used is: 30% red mud, 30% kaolin, 40% auxiliary materials; after batching, ball milling, spray drying, aging and pressing into powder. After forming, the green body is fired, cut and edged to obtain a wall brick product, and its bulk density is 1.33g / cm 3 , The modulus of rupture is 30.24MPa.

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Abstract

The invention provides a method for preparing a lightweight wall tile by using red mud as a main raw material. The method comprises: 1) adding Ca(OH)2 or CaO to a sodium silicate solution, carrying out a reaction in a hydrothermal reaction kettle, and filtering to obtain hydrated calcium silicate; 2) mixing the hydrated calcium silicate obtained in the step 1), red mud and ingredients, wherein the ingredients comprise a clay raw material and a feldspar raw material; 3) carrying out ball milling on the mixture obtained in the step 2), carrying out spray drying, and aging to obtain solid powder; 4) pressing the powder obtained in the step 3) into a billet; and 5) glazing the billet obtained in the step 4), firing, edging, and cutting to obtain the lightweight wall tile. The prepared lightweight ceramic of the present invention can be widely used in the field of ceramic wall tile production, and has great industrial prospect.

Description

technical field [0001] The invention belongs to the fields of comprehensive utilization of solid waste and production of ceramic materials. Specifically, the invention relates to a method for utilizing industrial solid waste, in particular to a method for preparing light-weight wall bricks by using red mud. Background technique [0002] Red mud is a waste residue of the alumina industry. In my country, nearly 60 million tons of red mud are produced every year, and the utilization rate of red mud is only about 4%. The stockpiling of red mud occupies a large area of ​​land, and the alkali contained in red mud will not only cause serious pollution to groundwater and soil, but also the fine powder of red mud will cause serious pollution to the atmospheric environment. Therefore, how to safely and effectively dispose and utilize red mud is a problem that needs to be solved urgently. [0003] For the application of red mud in the production of ceramic tiles, many scientific rese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B33/13C04B33/132
CPCC04B33/1322C04B2235/3436C04B2235/3454C04B2235/3472C04B2235/77Y02P40/60
Inventor 马淑花王建宇张洋郑诗礼王晓辉王月娇
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI