Method for determining content of silicate minerals and slag in Portland slag cement

Abstract

The invention discloses a method for determining the content of silicate minerals and slag in Portland slag cement. The method comprises a step of grinding granulated blast furnace slag power into a slag powder sample, a step of weighing a ZnO standard substance and adding an organic solvent, mixing and grinding by a mixer, and drying to obtain mixed powder of slag and zinc oxide which are uniformly mixed, a step of collecting diffraction data of the slag powder sample, and calculating a calibration constant in combination with the relative content of the zinc oxide and the slag powder sampleto obtain a crystal structure phase file of a partially known or completely unknown crystal structure, and a step of controlling the particle size of the Portland slag cement, collecting diffraction data of the Portland slag cement, determining a mineral structure file of contained minerals, and quantitatively analyzing to obtain the relative content of each mineral and slag. According to the method, the ZMV value of an unknown phase is obtained by mixing the unknown phase and an internal standard substance, and the file of a partially known or all unknown crystal structure is established, sothat the actual contents of a crystalline state and an amorphous state in the sample can be determined by analysis.

Description

technical field [0001] The invention belongs to the technical field of detection and analysis, and in particular relates to an XRD-partially known or completely unknown crystal structure quantitative analysis method for slag content in Portland cement. Background technique [0002] Common Portland Cement refers to a hydraulic cementitious material made of Portland cement clinker, an appropriate amount of gypsum and specified mixed materials. [0003] The main gelling component of general-purpose Portland cement is clinker, and its performance mainly depends on the mineral composition and mineral structure of the clinker. Clinker mainly contains four major minerals: tricalcium silicate (C3S), dicalcium silicate (C2S), tricalcium aluminate (C3A), and tetracalcium aluminoferrite solid solution (C4AF). The total amount in salt cement clinker accounts for 95% or even higher. Among them, the content of C3S is usually about 50%, which not only affects the early strength, but also...

AI Technical Summary

Problems solved by technology

This method relies more on the integrity of the enterprise, and is only a theoretical calculation method. In the actual supervision process, it cannot even reflect the effective content of clinker minerals, let alone the real composition of clinker and various mixed materials.

[0010] (2) The traditional X-ray diffraction method (standardization method) has complicated pre-treatment sample preparation, and it is difficult to offset the influence of overlapping peaks on quantitative results. At the same time, it can only measure the content of crystalline minerals, but cannot measure the content of amorphous slag

[0011] (3) The Rietveld method based on X-ray diffraction is accurate in quantification and does not require the company to provide relevant raw materials. However, the pretreatment is complicated, and internal standards need to be added before each test, and there is a risk of uneven internal standard mixing.

The results obtained are the relative content of crystalline and amorphous states, and the actual content of slag in the amorphous state cannot be determined

[0012] The traditional Rietveld method calculates the ZMV values ​​of all crystalline phases according to the structural parameters, but it is powerless for the ZMV values ​​of unknown structures, let alone calculate the relative content of unknown phases

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