Method for analyzing and detecting calcium element in ore
AssigneeJiangxi Rare Earth and Rare Metals Tungsten Group Holding Co., Ltd.
InventorsYulan Liang, Ling Peng, Zhijian Zhao
Life of this patent
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Abstract
A method for determining the content of calcium element in an ore is provided. It includes: decomposing the ore with hydrochloric acid and nitric acid under heating condition, adding perchloric acid, cooling, adding a small amount of water and boiling the solution to dissolve the salts, then cooling, diluting to the constant volume, filtering into a dry beaker with dry filter-paper, masking interfering ions with triethanolamine, adjusting the pH value of the solution with KOH, using calcein-thymolphthalein as indicator, and determinating the content of calcium with EDTA titrimetry.
Claims7
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.
Dependencies are inferred from the claim text.