CN105699406A

CN105699406A - Method for determining active SiO2 content in volcanic rocks

Info

Publication number: CN105699406A
Application number: CN201610100459.8A
Authority: CN
Inventors: 喻乐华
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-02-24
Filing date: 2016-02-24
Publication date: 2016-06-22

Abstract

The invention discloses a method for determining active SiO2 content in volcanic rocks. The method includes the steps of determining total SiO2 content in the volcanic rocks through chemical analysis; subjecting volcanic rock powder to XRD (X-ray diffraction); selecting data analysis of an independent diffraction peak of quartz (2thelta=67 degrees-69 degrees) in an XRD pattern, and computing crystalline phase area percentage above a diffraction background line and total phase area percentage below a diffraction peak line, namely SiO2 crystalline phase percentage; obtaining a noncrystalline phase SiO2 proportion by a subtraction method; using a formula satisfying that SiO2 content=(total SiO2 content)*(noncrystalline phase SiO2 proportion) so as to the active SiO2 content in the volcanic rocks. The method for determining the active SiO2 content in the volcanic rocks is not affected by various external factors such as powder particle fineness but only determined by internal ingredients and noncrystalline content, is simpler and more scientific, reasonable, precise and convenient, and is applicable to judgment on quality of the volcanic rocks or other pozzolanic materials such as mineral waste residues serving as supplementary cementing materials.

Description

Activity SiO in volcanic rock2The assay method of content

Technical field

The present invention relates to activity SiO in a kind of test volcanic rock₂The method of content, belongs to two grades of subject field of cementing material technology of Materials Science and Engineering first level discipline Inorganic Non-metallic Materials。

Background technology

Volcanic rock be due to volcanic eruption to earth surface through quick refrigeration containing the heterogeneous rock such as the nature of glass, crystal, being widely used as in cement-based material because it has good pozzolanic activity supplementary cementitious material (i.e. the composite material of cement and mortar or concrete mineral admixture), the quality at this supplementary cementitious material depends primarily on activity SiO in volcanic rock₂Content and active A l₂O₃Content, so activity SiO in test volcanic rock₂Content and active A l₂O₃Content is used as the quality good or not of supplementary cementitious material for passing judgment on volcanic rock pivotal role。Existing most measuring and calculating activity SiO₂The method of content is affected by the impact of powder particle fineness and causes evaluation result difference, as adopted acid treatment soluble substance dissolution determination of experimental method activity SiO₂Content etc.。Not yet there is activity SiO in generally accepted test volcanic rock at present₂Content method。Summary of the invention

Present invention aim to address activity SiO in test volcanic rock₂The problems such as the impact being subject to powder particle fineness existed during content, it is provided that activity SiO in a kind of test volcanic rock₂Content method, can test active A l in volcanic rock accurately, quickly and easily by technical solution of the present invention₂O₃Content is to contribute to the quality good or not passing judgment on volcanic rock as supplementary cementitious material。

Activity SiO in test volcanic rock of the present invention₂The flow process of content method is as follows: 1, measured full SiO in volcanic rock by chemical analysis₂Content；2, with volcanic rock powder X light diffracting analysis (XRD)；3, choosing the data analysis of quartz (2 69 °, θ=67 °) independent diffraction maximum in XRD figure is composed, the percentage rate of crystalline phase area more than calculating diffraction background line and the entire object phase area below diffraction crest line is SiO₂Crystalline phase percentage rate；4, amorphous phase SiO is obtained with minusing₂Ratio, then calculate: activity SiO₂Content=(full SiO₂Content) * (amorphous Si O₂Ratio)。

The present invention is the method for testing considered from material property essence (composition and structure), with existing method and technology comparative result not by the impact of many extraneous factors such as powder fineness of the particles, only determined by material intrinsic factor composition and noncrystalline content, more scientific and reasonable, accurate, simple and direct, convenient。The present invention tests activity SiO in volcanic rock₂Content is applicable to pass judgment on volcanic rock and is used as the quality good or not of supplementary cementitious material, simultaneously popularization and application other pozzolanic materials such as slag etc. can pass judgment on its quality good or not being used as supplementary cementitious material。

Accompanying drawing explanation

Fig. 1 is the inventive method embodiment 1 volcanic rock powder X-ray diffraction pattern analysis of spectrum figure (XRD)。

Fig. 2 is the inventive method embodiment 2 volcanic rock powder X-ray diffraction pattern analysis of spectrum figure (XRD)。

Detailed description of the invention

Below in conjunction with embodiment and compare accompanying drawing the inventive method is described in detail。

Embodiment 1: choose Cai Fang township, Anyuan County, Jiangxi Province tufa stone: first measured full SiO in volcanic rock by chemical analysis₂Content is 73.98%(WT)；With volcanic rock powder XRD as shown in Figure 1；The data analysis of quartz (2 69 °, θ=67 °) independent diffraction maximum is chosen in XRD figure is composed, MDIJade software or area integral is adopted to calculate, the percentage rate 48% of the entire object phase area of below the crystalline phase area of more than diffraction background line and diffraction crest line can be obtained, be SiO₂Crystalline phase percentage rate 48%, then obtain amorphous phase SiO with minusing₂Ratio 52%；Calculate: activity SiO₂Content=(full SiO₂Content 73.98%) * (amorphous Si O₂Ratio 52%)=38.5%。

Embodiment 2: choose Dongxiang County, Jiangxi Province copper mine ignimbrite: chemical analysis measures full SiO in this volcanic rock₂Content 68.33%(WT)；With volcanic rock powder XRD as shown in Figure 2；The data analysis of quartz (2 69 °, θ=67 °) independent diffraction maximum is chosen in XRD figure is composed, MDIJade software or area integral is adopted to calculate (but also other method), the percentage rate 33% of the entire object phase area of below the crystalline phase area of more than diffraction background line and diffraction crest line can be obtained, be SiO₂Crystalline phase percentage rate 33%, then obtain amorphous phase SiO with minusing₂Ratio 67%；Calculate: activity SiO₂Content=(full SiO₂Content 68.33%) * (amorphous Si O₂Ratio 67%)=45.8%。

Claims

1. activity SiO in a volcanic rock₂The assay method of content, it is characterised in that: comprise the following steps:

1.1 are measured full SiO in volcanic rock by chemical analysis₂Content；

1.2, with volcanic rock powder X light diffracting analysis (XRD)；

1.3, choosing the data analysis of quartz (2 69 °, θ=67 °) independent diffraction maximum in XRD figure is composed, the percentage rate of crystalline phase area more than calculating diffraction background line and the entire object phase area below diffraction crest line is SiO₂Crystalline phase percentage rate；

1.4, amorphous phase SiO is obtained with minusing₂Ratio；

1.5, calculated activity SiO2 content: utilize formula activity SiO₂Content=(full SiO₂Content) * (amorphous Si O₂Ratio), to obtain final product。