Method for preparing Alite-barium calcium sulphoaluminate cement from red mud

Abstract

The invention discloses a method for preparing Alite-barium calcium sulphoaluminate cement from red mud. The method comprises the following steps: (1) adopting a mineral phase of Alite-barium calcium sulphoaluminate cement prepared from red mud, wherein the mineral phase consists of the following components in percentage by mass: 5%-8% of C3.75B0.25A3S, 15%-19% of C2S, 40%-60% of C3S, 10%-20% of C4AF and 4%-8% of C3A; (2) according to the mineral phase composition of Alite-barium calcium sulphoaluminate cement, calculating the mixing amount of the following raw materials in percentage by mass: 6%-10% of red mud, 0.3%-0.5% of barium mud, 65%-75% of lime stone, 0.3%-1% of bauxite, 15%-25% of clay, 3%-5% of gypsum and 0.4%-1.5% of fluorite, wherein the fluorite is taken as a mineralizer; (3) crushing, homogenizing, drying, grinding, uniformly mixing, roasting and cooling the raw materials; and (4) adding and grinding gypsum or dihydration gypsum powder which accounts for 5-12% of the total mass until the specific surface area is 350-450m<2> / kg. The method disclosed by the invention is low in sintering temperature, high in early strength, stable in later strength and low in cost, can be used for providing an effective utilization way for comprehensively utilizing the red mud.

Description

technical field [0001] The invention belongs to the technical research field of green building materials, and relates to the preparation of alite-barium calcium sulfoaluminate cement by using the waste red mud produced in the alumina industry as a raw material. Background technique [0002] Red mud is a strong alkaline industrial waste discharged during the production of alumina (PH 10-12.5), with a high moisture content. The red mud produced in the production of alumina in my country is mainly divided into three types: Bayer method, combined method and sintering The main components of the combination method and the sintering method are roughly the same, and not only the ingredients required for the production of cement Al 2 O 3 , Fe 2 O 3 , CaO and SiO 2 Oxide composition, and contains a certain amount of 2 CaO SiO 2 and other active mineral components, which do not exist in Bayer process red mud 2 CaO SiO 2 and other active mineral components, red mud ha...

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Problems solved by technology

[0003] So far, there is no patent report on directly utilizing red mud as a raw material to produce Alite-barium sulfoaluminate cement, and Cheng Xin’s patent application (patent No. CN1513786) introduces a preparation of barium calcium sulfoaluminate mineral and The method of Alite-barium calcium sulfoaluminate cement compounded by Alite mineral, wherein the mineral composition is designed as C (4-X) B X A 3 : 3~38%, C 3 S: 30-60%, C 2 S: 15-40%, C 3 A: 3-20%, C 4 AF: 3~20%. This kind of cement introduces barium calcium sulfoaluminate mineral into Portland cement, the ratio is 3~38%. The main raw material is barite, etc., which is more expensive than traditional Portland cement. For special projects, such as: rush repair and rush construction projects, prefabricated components, GRC products, low temperature construction projects, seawater corrosion resistance projects, etc., not suitable for industrial production

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