Patent ID: 8796032
Filing Date: 2014-08-05
Classification: G01N

Abstract:
1. A method for analyzing and detecting calcium element in an ore, characterized by the following steps: (1) adding hydrochloric acid and nitric acid into a sample for heat treatment, adding perchloric acid till smoking, and after cooling, adding a small amount of water to dissolve the salts by boiling; (2) after cooling the test solution, transferring it to a 100-250 mL volumetric flask and bringing to volume, and filtering into a dry beaker through a dry filter-paper to separate calcium at least in part from impurity elements such as tungsten and molybdenum; (3) pipetting an appropriate amount of filtrate and adding triethanolamine to mask interfering ions; (4) adjusting the pH value of the solution with potassium hydroxide; (5) using calcein-thymolphthalein as a mixed indicator; and (6) titrating directly for calcium content with a standard EDTA solution and calculating for analysis results.