Method for efficiently and accurately detecting content of silicon dioxide in quartz sand

Abstract

The invention discloses a method for efficiently and accurately detecting the content of silicon dioxide in quartz sand. The method comprises the following steps: melting with analytically pure lithium tetraborate serving as a solvent at a high temperature in a platinum crucible to manufacture a sample wafer, namely a to-be-detected sample, required by a luminoscope, with analytically pure lithium tetraborate as a solvent before detection, adding 4N-level quartz sand to melt series standard samples, establishing a standard working curve, and finally, detecting and analyzing the to-be-detected sample according to the working curve to obtain the content of silicon dioxide. The standard samples and the to-be-detected sample are manufactured by melting through analytically pure lithium tetraborate, detection is performed by the luminoscope with the characteristics such as stable and rapid detection, and the weighed sample is large in amount and can generally reach 0.6-1.0g, which is 3-5 times the weight (0.2g) of a sample in a traditional alkali fusion detection method, so that the relative deviation during detection is much small. Moreover, analytically pure lithium tetraborate serves as the solvent, so that the melted sample is uniform and stable, and the detection result is real and reliable; and elements of analytically pure lithium tetraborate are light elements, matrix interference is almost avoided, and the reliability of the detection result obtained by the method provided by the invention is higher than that of the detection result obtained by the traditional method.

Description

technical field [0001] The invention relates to a method for physical and chemical analysis of the components of quartz sand, in particular to a method for efficiently, rapidly and accurately detecting the content of silicon dioxide in the quartz sand. Background technique [0002] Current research shows that: quartz sand is the main raw material for common glass production, and natural silica is the main component of glass, about 50-70%. Therefore, the content of silicon dioxide is particularly important in the batching process of all raw materials, especially in the production of TFT glass substrates, the content of silicon dioxide directly affects the quality of glass substrates, so the accurate and rapid detection of silicon dioxide in quartz sand The content of the glass substrate plays a key role in controlling the quality and stability of the glass substrate. [0003] Si is non-metallic, insoluble in all acid solutions, and cannot be detected by conventional chemical...

AI Technical Summary

Problems solved by technology

However, these methods have their own disadvantages

[0004] For example, the disadvantages of potassium fluorosilicate volumetric method: when the sample is co-melted with caustic alkali and sodium carbonate, soluble silicate is formed, and soluble silicate quantitatively generates potassium fluorosilicate (K2SiF6) in the presence of a large amount of potassium chloride and F- )precipitation

Indirect calculation of the silica content, the use of more complex reagents and cumbersome processes in the sample processing process, the silica content is relatively high between 98-99.9, resulting in unreliable silica content detection results

[0005] For example, the disadvantage of hydrofluoric acid volatilization and weight loss method: silicon dioxide may be surrounded by impurity element atoms and cannot react with hydrofluoric acid, that is, silicon dioxide cannot be completely volatilized, and impurities in the form of oxides will also react with hydrofluoric acid reaction, there are oxides to generate fluorides, and finally it will cause deviation when calculating the silica content indirectly

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