Steel slag ultra-sulphate cement and preparation method thereof

A technology of super sulfate cement and sulfate, which is applied in the field of cement materials, can solve the problem that super sulfate cement has no relevant patents, etc., and achieve the effect of saving stockpiling land, saving resources, and excellent performance

Inactive Publication Date: 2009-05-06
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, slag has been widely used in the world to obtain super sulfate cement, but t...

Method used

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  • Steel slag ultra-sulphate cement and preparation method thereof
  • Steel slag ultra-sulphate cement and preparation method thereof
  • Steel slag ultra-sulphate cement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: first steel slag, slag and clinker are ground until the specific surface area is at least 450m 2 / Kg, the specific surface area of ​​gypsum is at least 500m 2 / Kg, then measure and weigh according to the proportion of Table 2 formula 1 (wherein the steel slag dosage reaches 40%), each raw material is fully mixed in the forced mixer, and the unloading material is the prepared new steel slag super sulfate cement . The chemical composition analysis of the super sulfate cement is shown in Table 3. Remove the alkaline activator part (0.7% alkaline activator) in formula 1, the particle size distribution curve of the remaining raw material components is shown in Figure 3. The particle size distribution curve is a summary of the results of three parallel samples, and has good statistical regularity. The test results of physical and mechanical properties of the corresponding cement are shown in Table 4. From the performance index of formula 1 in Table 4, it can...

Embodiment 2

[0037] Embodiment 2: earlier raw materials such as steel slag, slag, clinker and gypsum are weighed according to the ratio of Table 2 formula 2 (wherein the amount of steel slag reaches 40%), and then fully ground in the cement mill, the obtained steel slag super The specific surface area of ​​sulfate cement is 484m 2 / Kg, the chemical composition analysis of the super sulfate cement is also shown in Table 3. Figure 3 shows the particle size distribution curves of the remaining raw material components after removing the alkaline activator part (2% alkaline activator) in formula 2. The particle size distribution curve is a summary of the results of three parallel samples, and has good statistical regularity. In Fig. 3, the abscissa is the particle size, the left ordinate is the cumulative volume distribution function, and the right ordinate is the differential distribution curve function curve. The particle size distribution test instrument is a fully automatic dry-wet two-in...

Embodiment 3

[0039] Embodiment 3: first steel slag, fly ash, slag and clinker are ground until the specific surface area is at least 450m 2 / Kg, the specific surface area of ​​gypsum is at least 500m 2 / Kg, then measure and weigh according to the ratio of Table 2 formula 3 (wherein the steel slag dosage reaches 40%), then fully grind in the cement mill to make steel slag super sulfate cement. The chemical composition analysis of the super sulfate cement is shown in Table 3 formula 3, except the alkaline activator part (0.7% alkaline activator) in the formula, the particle size distribution curve of the remaining raw material components is shown in Figure 4. The particle size distribution curve is a summary of the results of three parallel samples, and has good statistical regularity. The test results of physical and mechanical properties of the corresponding cement are shown in Table 4. It can be seen from Table 4 that the various indicators of the steel slag super sulfate cement also me...

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Abstract

The invention relates to steel slag super-sulphate cement, which comprises the following components in weight percentage: 20 to 80 percent of steel slag, 5 to 65 percent of slag and/or fly ash, 5 to 25 percent of sulfate activator, 1 to 10 percent of cement clinker or calcium hydroxide, and 0.05 to 3 percent of alkaline activator. A method for preparing the steel slag super-sulphate cement comprises the following steps: grinding the steel slag, the slag and/or the fly ash, and further grinding the cement clinker, the sulfate activator and/or the alkaline activator separately; and adopting a mixed grinding method or a mixed material method to prepare the cement after the measurement according to a formulation, wherein when the mixed grinding method is adopted, each raw material is added into a cement grinding mill until the grinding is even after the measurement according to the formulation; and when the mixed material method is adopted, each raw material is added into a compulsory mixer after the measurement according to the formulation until the mixture is mixed sufficiently; or each raw material is directly added into the cement grinding mill to perform grinding after the measurement according to the formulation. The method can change wastes of the steel slag, the slag, and the fly ash which are difficult to be used into valuable, thereby contributing to preventing environment, saving piling ground, and reducing cost with simple and practical preparation process.

Description

technical field [0001] The invention relates to a cement material, in particular to a steel slag super sulfate cement and a preparation method thereof. Background technique [0002] The cement industry has always been recognized as a major player with high energy consumption and high exhaust emissions. On the one hand, the energy consumption per ton of cement clinker is still as high as 103-130kg standard coal due to the calcination of cement clinker even if the new dry process is adopted, and my country's coal resources are increasingly scarce. On the other hand, the CO emitted by the cement industry 2 Approx. anthropogenic CO 2 20% of emissions, about 1 / 2 of which is CO 2 Emissions come from energy use and the breakdown of calcium carbonate during clinker production, which contributes about 10% to global warming. China is currently the world's second largest CO 2 Emitting countries, accounting for about 13.6% of the world's total emissions. Although measures have bee...

Claims

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Application Information

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IPC IPC(8): C04B7/147C04B7/26C04B7/38
CPCC04B28/10C04B28/02Y02W30/91C04B18/08C04B18/141C04B18/142C04B20/026C04B22/143C04B22/145C04B22/146C04B2103/10C04B12/04C04B22/10C04B22/16
Inventor 赵青林周明凯何涛李磊
Owner WUHAN UNIV OF TECH
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