Determination of total iron in iron ore by stannous chloride-methylene blue-potassium dichromate mercury-free titration
A method for determining total iron in iron ore by potassium dichromate mercury-free titration was established by using methylene blue as pre-reduction indicator and stannous chloride as reduction agent.The fundamental principle and testing condition of the testing method was discussed and the effect of the dosage of pre-reduction reaction indicator on testing result was tested.The result indicated the color change of pre-reduction terminal and titration end point was acute by using SnC12 as pre-reduction agent, methylene blue as pre-reduction indicator and adding 2-3 drops of 2.94 g/L methylene blue.The interference test indicated most elements in iron ore did not interfere with the test.Analysis was conducted on two types of iron ore, with RSD of 0.34％ and 0.16％ respectively.Control test was conducted by standard method.It was found under the confidence level of 95 ％, no significant difference was found on the precision of the test results of both methods.No significant differences were found between the average values of both data as well.
methylene bluestannous chloridepotassium dichromate mercury-free titrationiron oretotal iron
NETL
NSTL
万方数据
维普
