A low-cost high-strength red mud-coal-series metakaolin geopolymer
A metakaolin and high-strength technology, which is applied in the field of low-cost high-strength red mud-coal-based metakaolin geopolymers, can solve the problems of low red mud content, incomplete utilization of red mud, and high production costs, and achieve the goal of preparation technology The effect of simplicity, good economic value, and a wide range of material sources
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Embodiment 1
[0025] (1) Raw material selection and processing:
[0026] The materials used include Bayer red mud from Shanxi Hejin Aluminum Plant and HP-90B coal-measure metakaolin from Shanxi Xinzhou Calcined Kaolin Plant (the average particle size of the specific surface area is 1.34μm, and the specific surface area is 4480m 2 / kg), which is formed by coal-series kaolin after roasting at 800°C for 40 minutes, and belongs to hard metakaolin. The chemical compositions of the two are shown in Table 1 and Table 2, respectively.
[0027] Table 1 Chemical composition of Bayer process red mud.
[0028]
[0029] Table 2 Chemical composition of coal-measure metakaolin.
[0030]
[0031] The water glass solution is commercially available industrial water glass (SiO 2 Content 24.73%, Na 2 O content 8.17%, modulus 3.12, Baume degree 40, density 1.375g / cm 3 ), the analytically pure sodium hydroxide is commercially available sodium hydroxide with a purity of over 99%, and the distilled water...
Embodiment 2
[0042] (1) Raw material selection and processing: as described in step (1) in Example 1
[0043] (2) Raw material processing:
[0044] The Bayer process red mud is naturally air-dried, crushed by a crusher and passed through a 0.075mm sieve; the crushed and sieved red mud powder is dried in an oven at 105°C for 24 hours to obtain the average particle size of the specific surface area of the red mud raw material required for the test is 2.64 μm , the specific surface area is 2270m 2 / kg).
[0045] Weigh the Bayer process red mud, coal series metakaolin, and sodium hydroxide analytically pure according to their mass, including 700 g of Bayer process red mud, 300 g of coal series metakaolin, and 90 g of analytically pure sodium hydroxide for later use.
[0046] According to the set Si / Al (the atomic molar ratio of Si / Al in the raw material is 1.1) and the mass ratio of water to solid (the mass ratio of water to solid is 0.4, the mass of water includes the difference between t...
Embodiment 3
[0053] (1) Raw material selection and processing: as described in step (1) in Example 1
[0054] (2) Raw material processing:
[0055] The Bayer process red mud is naturally air-dried, crushed by a crusher and passed through a 0.075mm sieve; the crushed and sieved red mud powder is dried in an oven at 105°C for 24 hours to obtain the average particle size of the specific surface area of the red mud raw material required for the test is 2.64 μm , the specific surface area is 2270m 2 / kg).
[0056] Weigh the Bayer process red mud, coal series metakaolin, and sodium hydroxide analytically pure according to their mass, including 500 g of Bayer process red mud, 500 g of coal series metakaolin, and 90 g of analytically pure sodium hydroxide for later use.
[0057] According to the set Si / Al (the atomic molar ratio of Si / Al in the raw material is 1.1) and the mass ratio of water to solid (the mass ratio of water to solid is 0.4, the mass of water includes the difference between t...
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