Method for quickly measuring sulfate radical content in magnesium method desulfurization process

Abstract

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.

Description

technical field [0001] The invention belongs to a method for measuring sulfate content in a magnesium oxide desulfurization system, in particular to a rapid detection method for sulfate content in an absorption tower slurry in the magnesium oxide desulfurization process. Background technique [0002] Magnesium oxide desulfurization is the most commonly used desulfurization method at present. During system operation and commissioning, the content of sulfate in the absorption tower slurry directly affects the crystallization of magnesium sulfite and the control of slurry discharge. Timely determination of sulfate content becomes an important indicator of system operation control. The traditional detection method generally adopts the gravimetric method. The process is cumbersome and the detection time is long. On the one hand, it increases the labor intensity of the detection personnel. On the other hand, it cannot provide the control data of the system operation in time, resul...

AI Technical Summary

Problems solved by technology

During system operation and commissioning, the content of sulfate in the absorption tower slurry directly affects the crystallization of magnesium sulfite and the control of slurry discharge. Timely determination of sulfate content becomes an important indicator of system operation control. The traditional detection method generally adopts the gravimetric method. The process is cumbersome and the detection time is long. On the one hand, it increases the labor intensity of the detection personnel. On the other hand, it cannot provide the control data of the system operation in time, resulting in a certain lag

In addition, the centrifuge detection method has a large error in the determination of sulfate root due to the influence of the instrument condition control. In addition, due to the small measurement range of the instrument, a small reading error will produce a large error, and the accuracy is very poor.

At present, there is no standard for the determination of sulfate radicals in the slurry of the magnesium desulfurization system. This method is accurate, fast and adaptable through a large number of actual magnesium desulfurization projects of different types and sizes.