A kind of sulphoaluminate cement and preparation method thereof

A technology of sulphoaluminate cement and cement clinker, which is applied in the direction of cement production, etc., can solve the problems of low solubility or dissolution rate of external components, difficulty in mixing uniformly, and unstable performance, so as to avoid mismatching release rate, Avoids uneven mixing and facilitates quality control effects

Active Publication Date: 2021-05-28
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these external components are usually added during the cement application process, and it is difficult to fully mix them evenly. Moreover, the solubility or dissolution rate of these two types of external components is low, which leads to a mismatch between the cement hydration rate and the timing of the external components. In turn, unstable performance often occurs, and even performance accidents occur.
In addition, lithium salts and boric acid (salts) used as external components are generally chemical raw materials, and the cost is relatively high.

Method used

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  • A kind of sulphoaluminate cement and preparation method thereof

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preparation example Construction

[0032] The invention provides a kind of preparation method of sulphoaluminate cement, it specifically comprises the following steps:

[0033] (1) selecting raw materials of sulphoaluminate cement, wherein the raw materials include substances containing lithium elements, grinding the raw materials to obtain raw meal powder; then calcining at 1200-1350° C. for 30 minutes to obtain cement clinker;

[0034] (2) mixing the cement clinker with anhydrite and grinding to obtain sulphoaluminate cement;

[0035] In mass percentage, the cement clinker includes:

[0036] Anhydrous calcium sulfoaluminate: 30-80%, dicalcium silicate: 10-40%, ferrite minerals: 5-20%, free gypsum: 0-15%, perovskite: 0-5%, free Calcium Oxide: 0-3% and Lithium Oxide: 0.06-0.8%.

[0037] The present invention does not specifically limit the raw materials of sulphoaluminate cement. The raw materials for the production of conventional sulphoaluminate cement are preferred. The raw materials of conventional sulpho...

Embodiment 1

[0064] A preparation method of sulphoaluminate cement, comprising the following steps:

[0065] (1) With limestone, bauxite, anhydrite, lithium slag as raw materials, the concrete components of each raw material are shown in Table 1, mixed by 60 parts of limestone, 28 parts of bauxite, 8 parts of anhydrite, and 4 parts of lithium slag, Grind into raw meal powder with a laboratory ball mill;

[0066] (2) Stir the raw meal powder with 6-8% water evenly, press it into a raw meal cake, and dry it;

[0067] (3) Pre-burn the raw cake in a muffle furnace at 950°C for 30 minutes, then transfer it to a high-temperature electric furnace at 1300°C, keep it warm for 1 hour, take it out, and cool it to room temperature by wind to obtain clinker;

[0068] (4) Mix clinker and anhydrite at a ratio of 85:15, and grind until the specific surface area is 400cm2 / kg to obtain cement.

[0069] Table 1 raw material chemical composition (%)

[0070] components loss SiO 2

Embodiment 2

[0072] A preparation method of sulphoaluminate cement, comprising the following steps:

[0073] (1) With limestone, bauxite, and desulfurized gypsum as main raw materials, industrial grade lithium carbonate and borax are used as additives. The specific components of each raw material and additive are shown in Table 2; 0.5 part, 0.5 part of lithium carbonate, 0.2 part of borax are mixed, and then ground together into raw meal powder;

[0074] (2) Stir the raw meal powder with 6-8% water evenly, press it into a raw meal cake, and dry it;

[0075] (3) Pre-burn the raw cake in a muffle furnace at 950°C for 30 minutes, then transfer it to a high-temperature electric furnace at 1280°C, keep it warm for 1 hour, take it out, and cool it to room temperature by wind blowing to obtain clinker;

[0076] (4) Mix clinker and anhydrite at a ratio of 84:16, and grind until the specific surface area is 400±20cm2 / kg to obtain cement.

[0077] Table 2 raw material chemical composition (%)

[...

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Abstract

The invention relates to a preparation method of sulphoaluminate cement, which comprises: selecting raw materials of sulphoaluminate cement, including materials containing lithium elements, grinding the raw materials to obtain raw meal powder, and then passing through 1200 Calcining at ‑1350°C for 30 minutes to obtain cement clinker; mixing the cement clinker with anhydrite and grinding to obtain sulphoaluminate cement; in terms of mass percentage, the cement clinker includes: anhydrous calcium sulphoaluminate : 30‑80%, dicalcium silicate: 10‑40%, ferrite minerals: 5‑20%, free gypsum: 0‑15%, perovskite: 0‑5%, free calcium oxide: 0‑3 %, lithium oxide: 0.06‑0.8% and boron oxide: 0‑0.5%. The method of the invention can uniformly disperse the lithium salt or boric acid (salt) in the cement, and release it synchronously when it reacts with water, so as to maximize its effect and improve the early strength of the sulphoaluminate cement. The invention can utilize lithium-containing and boron-containing waste materials as raw materials, and can also utilize waste while reducing costs.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a sulphoaluminate cement and a preparation method thereof. Background technique [0002] Sulphoaluminate cement is the most widely produced and widely used type of cement except Portland cement. Compared with Portland cement, sulfoaluminate cement has the outstanding advantage of rapid development of early performance, so it is widely used in special construction fields such as repair, rapid construction, low temperature or negative temperature construction. Although sulphoaluminate cement has the characteristics of rapid hardening and early strength, sulphoaluminate cement alone cannot fully meet the increasingly diverse construction needs, such as emergency repairs and plugging. Therefore, sulphoaluminate cement still needs to add admixtures for performance regulation during use. [0003] Lithium salt and boric acid (salt) are currently recognized as the most effective two t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/42C04B7/32
CPCC04B7/32C04B7/421C04B7/424C04B7/425Y02P40/10
Inventor 张文生叶家元
Owner CHINA BUILDING MATERIALS ACAD
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