High belite-containing sulfoaluminous clinker, method for the production and the use thereof for preparing hydraulic binders

A technology of sulphoaluminate clinker and manufacturing method, which can be applied in the direction of cement production, climate sustainability, sustainable waste treatment, etc., and can solve problems such as calcium sulfate instability

Inactive Publication Date: 2012-11-07
LAFARGE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0035] However, despite the good performance obtained in the laboratory, this clinker and others cited by Mehta in his publications have disadvantages associated with their high calcium sulfate content; indeed, it is known that calcium sulfate Unstable at high temperatures, it dissociates at high temperatures, producing gaseous sulfur dioxide SO 2 , especially in reducing atmospheres or at low oxygen pressures, as is the case in rotary furnaces
Therefore, the clinker proposed by Mehta is difficult to produce with sulfur dioxide SO 2 Manufactured in conventional rotary furnaces without serious environmental concerns related to emissions

Method used

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  • High belite-containing sulfoaluminous clinker, method for the production and the use thereof for preparing hydraulic binders
  • High belite-containing sulfoaluminous clinker, method for the production and the use thereof for preparing hydraulic binders
  • High belite-containing sulfoaluminous clinker, method for the production and the use thereof for preparing hydraulic binders

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] Embodiment 1: Preparation of raw material mixture of sulphoaluminate clinker

[0104] For the manufacture of the sulphoaluminate clinker of the invention, the raw materials used are selected from Orgon limestone sold by MEAC, brand alumina-rich clay and / or the less alumina-rich clay sold by AGS-BMP Brand clay and crushed natural plaster from Villiers. A small amount of iron oxide or iron ore as shown in Table 3 was also used to adjust the ferrite phase content of the clinker.

[0105] The chemical formulations of the raw materials used are listed in Table 2.

[0106] Table 2

[0107] ％ CaO SiO 2 al 2 o 3 Fe 2 o 3 SO 3 MgO TiO 2 K 2 o Na 2 o Loss on ignition Orgon fine grain 55.71 0.01 0.08 0.03 0.05 0.19 0.01 0.01 0.01 43.67 BS4 clay 0.14 41.88 40.26 0.66 0.34 0.08 0.87 0.16 0.12 16.03 BS5 clay 0.38 51.04 32.78 1.30 0.20 0.18 1.3...

Embodiment 2

[0120] Embodiment 2: the preparation of sulfoaluminate clinker

[0121] 250 grams of the raw material mixture from Table 4 were placed in a crucible with a diameter of 7 cm and a height of 10 cm.

[0122] The crucible is first brought to a pre-calcination temperature of 950 to 975°C with a ramp rate of approximately 15°C / min. The raw material mixture was precalcined for 30 minutes.

[0123] Then, the crucible was quickly transferred to a high-temperature furnace previously heated to 950 to 975°C.

[0124] The crucible thus transferred was allowed to reach thermal equilibrium at 950 to 975°C, then the temperature was increased at 5°C / min until it reached a temperature of 1150 to 1350°C over a period of 30 to 60 minutes.

[0125] After the firing time, the clinker thus obtained was cooled open until it reached ambient temperature.

[0126] As shown in Table 5, compared with ordinary Portland cement, CO 2 The reduction in emissions is greater than 25%.

[0127] table 5

[...

Embodiment 3

[0130] Example 3: Sulphoaluminate cement

[0131] The cements corresponding to the different clinkers were obtained by co-grinding with 8% gypsum as a setting regulator using a laboratory grinder with a capacity of 1 kg, but the raw material mixture in Table 4 + SO 4 The exception is the corresponding clinker, which already contains the required amount of gypsum.

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Abstract

The present invention concerns a belite-rich sulphoaluminous clinker, a method for producing such a clinker and its use for preparing hydraulic binders, and comprising as a mineralogical formulation: 5 to 25%, preferably 10 to 20%, of a calcium aluminoferrite phase with a formulation corresponding to the general formula C2AXF(1-X), with X comprised between 0.2 and 0.8. 15 to 35%, preferably 20 to 30%, of a calcium sulphoaluminate phase 'yee' limit' (C4A3$), 40 to 75%, preferably 45 to 65% belite (C2S), from 0.01 to 10% of one or several minor phases selected from calcium sulphates, alkaline sulphates, perovskite, calcium aluminates, gehlenite, free limestone and periclase, and / or a vitreous phase, and at least one or several secondary elements selected from sulphur, magnesium, sodium, potassium, boron, phosphorus, zinc, manganese, titanium, fluorine, chlorine, the total content of these secondary elements being less than or equal to 15%.

Description

[0001] The application date is July 19, 2005, the application number is 200580031466.7, and the invention name is "Sulphoaluminate clinker with high belite content, its manufacturing method and its use for preparing hydraulic adhesives "A divisional application of the Chinese patent application. technical field [0002] The present invention relates to belite-rich sulphoaluminate clinker, a process for the manufacture of this clinker and its use for the preparation of hydraulic binders. Background technique [0003] Most modern concrete is made with hydraulic cement, usually obtained from Portland cement clinker. [0004] Portland cement is manufactured by heating an intimate mixture of limestone, clay, silica and iron ore in a rotary furnace to over 1400°C. The calcined mixture, clinker, is in the form of hard pellets which, after cooling, are ground with calcium sulfate and other added minerals to form Portland cement. [0005] The raw material mixture put into the furna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/32C04B28/06
CPCC04B28/065C04B7/323C04B2111/00215Y02P40/10Y02W30/91C04B7/24C04B7/3453C04B7/52C04B14/28C04B18/08C04B18/141C04B22/064C04B2103/12C04B2103/408C04B22/143C04B7/32C04B28/06
Inventor E·佳特纳李观书
Owner LAFARGE SA
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