Method for stabilising metastable soluble anhydrite III, method for producing a hydraulic binder based thereon, the obtained hydraulic binder, the uses thereof and an industrial plant for carrying out
A metastable, soluble technology used in the cement industry to solve the problems of difficult and expensive interruptions in production
Inactive Publication Date: 2013-04-24
扬·科伦贝亚努
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Problems solved by technology
In addition, these converters have a strong inertia, that is, they must spend a lot of time cooling or bringing them to the desired temperature
For these reasons, interrupting production is difficult and expensive in terms of time and energy consumption
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[0047] As shown in the drawing, the calcium sulfate-based powder composition is stored in a hopper 1 in advance. The pulverulent composition used is advantageously based on natural gypsum, synthetic gypsum (in particular sulfur gypsum, phosphogypsum, borogypsum, titanogypsum) or calcium sulfate hemihydrate (type alpha or beta).
[0048] This powdery compound can be mixed with one or more of the following compounds: aerolime, hydraulic lime, marble dust, calcium carbonate, polycarboxylates. These supplementary materials, well known to those skilled in the art, improve the properties of the hydraulic binder, in particular compressive mechanical strength, fire resistance and the like. In practice, 1% to 15% by weight of particles of metastable soluble anhydrite III and / or anhydrite II and / or calcium sulphate beta hemihydrate are advantageously mixed with lime or slaked lime. The mixture is calcined to improve its physicochemical reactions in subsequent processes.
[0049] The p...
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Abstract
Process for preparing a stabilized soluble anhydrite III-based hydraulic binder, hydraulic binder obtained, use of said binder and industrial installation for implementing the process. The invention relates to a process for preparing a stabilized soluble anhydrite III-based hydraulic binder. It also relates to the hydraulic binder obtained and to the use of said hydraulic binder in the cement industry. It also relates to an industrial installation for implementing such a process. According to the invention, the preparation of an anhydrite III-based hydraulic binder is carried out a) by heating a calcium sulphate-based pulverulent composition in order to form metastable soluble anhydrite III, and b) by carrying out a mecanosynthesis on the composition obtained in step a) in order to stabilize the soluble anhydrite III. The objective of the invention is to stabilize particles of metastable soluble anhydrite III without having to resort to the cooling of said particles.
Description
technical field [0001] The invention relates to a method for stabilizing metastable soluble anhydrite III and a method for preparing the stabilized soluble anhydrite III-based hydraulic binder. [0002] The invention also relates to the obtained hydraulic binder and its use in the cement industry. [0003] The invention also relates to an industrial plant in which the method can be carried out. [0004] The invention relates to the technical field of cement industry, and more specifically relates to a cement composition obtained by dehydrating calcium sulfate. Background technique [0005] Soluble anhydrite III based hydraulic binders are well known to those skilled in the art. The chemical formula is (CaSO 4 2H 2 O) natural calcium sulfate or synthetic calcium sulfate (gypse (gypse)) or chemical formula (CaSO 4 1 / 2H 2 O) calcium sulfate hemihydrate (gypsum ) of strong dehydration (220 ° C to 360 ° C) will lead to the formation of chemical formula (CaSO 4 ·εH 2 O) ...
Claims
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IPC IPC(8): C04B11/05
CPCC04B11/05
Inventor E·迪穆兰C·帕拉西奥斯
Owner 扬·科伦贝亚努