How to determine the amount of blue absorbed by Bentonite
Bentonite absorption test method (Huang Tianyou Yu Zhenzong blue quantity Review Department of mechanical engineering Tsinghua University 100084) Abstract: This paper reviews the origin and change of test methods for blue in China now that the use of bentonite absorption, pointed out that the preparation and methylene blue solution of the test method of bentonite slurry sample preparation, different sample the amount of bentonite and the concentration of methylene blue solution of methylene blue absorption conversion, and should be paid attention to in the sand effective bentonite content determination and some problems in application.
So we can use the adsorption capacity for methylene blue (hereinafter referred to as the methylene blue absorption, the unit is g / lOOg clay) to the identification of bentonite quality. China's Shenyang Research Institute of Foundry without spectrophotometer or colorimeter, but with a 2O standard solution of different concentration, many kinds of bentonite produced per 100g ceiling how many grams of blue [5]. Germany has used similar methods for the determination of a sand bentonite bentonite containing different amount of light transmission rate as the control curve with visual method, which can detect the effective bentonite content. To measure the sand in Shenyang tractor factory using visual colorimetric method to detect the adsorption capacity of the United States had used methylene determination of montmorillonite and blue medicinal ceramic raw materials in green sand effective bentonite content of [7].2O in the early 5O century. Until 6O in the mid-1990s, the United States engaged in oil drilling industry National Lead Co.BaroidDiv. published an article that The difference between method [8~11]. and absorption blue colorimetric method for the determination of Bentonite on the successful application of titration method to sample liquid dispersed gradually in the instillation of methylene blue solution. If you add all of methylene blue adsorbed bentonite is free of methylene blue does not exist in a sample liquid such as adsorption swelling fruit. Bentonite has been saturated, free of methylene blue to sample liquid, then that has reached the end point. So that the adsorption capacity of methylene blue solution. End point judgment is on the sample liquid drops on the paper, halo mud observation filter leakage around the blue and green colors.
The test method is mainly clay drying after adding sodium pyrophosphate to the clay crystal layer dispersed. Then add excess clay to the methylene blue dye adsorption. The supernatant was then fully separated using film and particle filter or centrifuge, to exclude the interference of sand particles on the test results. The supernatant was diluted with distilled water the suitable concentration was determined by spectrophotometer, we can calculate the amount of clay adsorption of methylene blue. The results showed that the adsorption capacity of bentonite methylene blue clay mineral montmorillonite as the main components, and in accordance with the adsorption capacity for methylene blue illite and kaolinite clay mineral is very small, the adsorption amount of quartz sand very little.
