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Preparation method and application of red mud-based cement concrete long-term strength enhanced cementing material

A cement concrete and post-strength technology, which is applied in the field of cement concrete, can solve problems such as the limitation of the amount of red mud, and achieve the effects of avoiding efflorescence, improving mechanical properties, and eliminating application restrictions

Active Publication Date: 2021-12-31
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its high iron and high alkali characteristics, the amount of red mud used in the field of building materials is severely limited

Method used

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  • Preparation method and application of red mud-based cement concrete long-term strength enhanced cementing material
  • Preparation method and application of red mud-based cement concrete long-term strength enhanced cementing material
  • Preparation method and application of red mud-based cement concrete long-term strength enhanced cementing material

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0031] Red mud yl late strength reinforcement of concrete preparation of cementitious material, comprising the steps of:

[0032] (1) The red mud dried to a moisture content below 1%, and grinding to 0.2mm sieve 1%. In parts by weight, 40 parts by taking the red mud, 30 parts of sodium hydroxide, 30 parts of calcium oxide uniformly mixed, water was added and the resulting mixture formulated as a slurry (solid-liquid ratio of 1:10). The slurry is then enclosed in a sealed pressure vessel, after 120min incubation was warmed to 200 ℃. After completion of the incubation allowed to cool, the supernatant was discarded, and the solid was washed using water several times, until a pH 2 O mass fraction of 1.32%, K 2 O content of 0.27%, alumina-silica ratio of 0.73, which is the main component of red mud modified calcium almandine and hematite.

[0033] (2) in step (1) was added to the obtained modified calcium carbonate, red mud and straw toner, wherein: calcium oxide accounting modified re...

no. 2 example

[0040] Red mud yl late strength reinforcement of concrete preparation of cementitious material, comprising the steps of:

[0041] (1) The red mud dried to a moisture content below 1%, and grinding to 0.2mm sieve 1%. In parts by weight, 42 parts by taking the red mud, 25 parts of sodium hydroxide, 33 parts of calcium oxide uniformly mixed, water was added and the resulting mixture formulated as a slurry (solid-liquid ratio of 1:10). Reaction with sodium hydroxide to provide the desired OH - Concentration, for the synthesis of calcium oxide, calcium almandine. The slurry is then enclosed in a sealed pressure vessel, after 120min incubation was warmed to 210 ℃. After completion of the incubation allowed to cool, the supernatant was discarded, and the solid was washed using water several times, until a pH 2 O mass fraction of 1.48%, K 2 O mass fraction of 0.25%, Al-Si ratio of 0.85, which is the main component of red mud modified calcium almandine and hematite.

[0042] (2) in step (1...

no. 3 example

[0049] Red mud yl late strength reinforcement of concrete preparation of cementitious material, comprising the steps of:

[0050] (1) The red mud dried to a moisture content below 1%, and grinding to 0.2mm sieve 1%. In parts by weight, 37 parts by taking the red mud, 35 parts of sodium hydroxide, 28 parts of calcium oxide uniformly mixed, water was added and the resulting mixture formulated as a slurry (solid-liquid ratio of 1:10). Reaction with sodium hydroxide to provide the desired OH - Concentration, for the synthesis of calcium oxide, calcium almandine. The slurry is then enclosed in a sealed pressure vessel, after 120min incubation was warmed to 220 ℃. After completion of the incubation allowed to cool, the supernatant was discarded, and the solid was washed using water several times, until a pH 2 O mass fraction of 0.79%, K 2 O content of 0.15%, alumina-silica ratio of 0.64, which is the main component of red mud modified calcium almandine and hematite.

[0051] (2) in step...

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Abstract

The invention discloses a preparation method and application of a red mud-based cement concrete long-term strength enhanced cementing material. The method comprises the following steps: (1) modifying the red mud until the total percentage content of potassium and sodium in the red mud is not more than 2% and the aluminum-silicon ratio is not more than 1 to obtain the modified red mud of which the main components are andradite and hematite; (2) uniformly mixing the modified red mud with calcium and carbonaceous modifiers, and calcining to obtain calcined red mud. (3) preparing the calcined red mud into particulate matters, and then separating out magnetic products in the particulate matters to obtain residual non-magnetic residues which are the cement concrete long-term strength enhancing cementing material. According to the invention, by modifying the red mud component, a foundation is laid for reforming the red mud component in a subsequent calcining process, the red mud-based long-term strength enhanced cementing material mainly containing dicalcium silicate cementing minerals is finally obtained, and the long-term strength can be obviously improved after the red mud-based long-term strength enhanced cementing material is added into cement concrete; meanwhile, the iron ore concentrate with the iron grade exceeding 50% is obtained, which can be directly used for steelmaking in the iron and steel smelting industry.

Description

Technical field [0001] The present invention relates to the field of concrete technology, in particular to a group of red mud late strength reinforcement of concrete preparation and use of the cementitious material. Background technique [0002] The information disclosed in the background is disclosed only to increase the understanding of the overall background of the present invention, and is not necessarily considered to admit or imply that the information is intended to be a prior art known to those skilled in the art. [0003] Red mud is a large amount of solid waste generated during the production of alumina due to alkali, high iron content, the traditional process of stockpiling not only occupy the land caused by environmental pollution, and the elements for red mud is undoubtedly a waste of resources. Therefore, the development of red mud processing technology to achieve the comprehensive utilization of red mud has practical significance. At present, domestic and foreign r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/08C22B1/02B03C1/02C04B18/04
CPCC04B22/08C22B1/02B03C1/02C04B18/0409Y02P10/20
Inventor 吴佳明叶正茂卢晓磊王蓓蓓李全亮
Owner UNIV OF JINAN
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