The invention discloses a method for quickly measuring
sulfate radical content in a
magnesium method desulfurization process. The method consists of the processes of
filtration, constant
volume determination, acidification,
precipitation and
back titration and comprises the following steps of: filtering a fetched sample by using
filter paper; filling quantitative filtered clear solution with constant volume into a
volumetric flask; filling proper constant volume clear solution in a
beaker, and adding diluted
hydrochloric acid of 1:1 concentration for acidifying; adding excessive
barium chloride into the acidified clear solution to perform
precipitation; filtering and fully washing the
sediment, and titrating the total weight of
barium,
calcium and
magnesium ions by using
ethylene diamine tetraacetic acid (EDTA) coordination agent under the condition that chrome black T is used as an indicator; and meanwhile, calculating the content of the
barium ions by measuring the total weight of the
calcium and the
magnesium so as to calculate the content of the
sulfate radicals. The method has the advantages that: the control of solution concentration and measuring
process conditions is accurate, the measurement of the content of the
calcium and the magnesium is completed at the same time, and the preparation of barium and magnesium
mixed solution is not needed; the accuracy of the
sulfate radical detection is improved, and the detection time is shortened; and the method is suitable for quickly measuring the
sulfate radical content in the debugging and operating process of a magnesium
oxide method desulfurization
system.