Determination method and control method for content of sulfur contents in superphosphate
A calcium superphosphate and determination method technology, which is applied in the direction of chemical analysis, chemical analysis by titration, material analysis by observing the influence of chemical indicators, etc., can solve the problems of slow and inconvenient sulfur content , to achieve the effects of high accuracy, cost saving and time saving
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Embodiment 1
[0039] This embodiment provides a method for determining the content of sulfur element in superphosphate, including the elemental sulfur content S in superphosphate 1 Determination of the sulfur element content S in the sulfate state 2 determination.
[0040] The determination of elemental sulfur content in elemental form includes the following steps in sequence:
[0041] Sampling, weigh 0.2g of sample;
[0042] Combustion, set the temperature of the high-temperature furnace at 700 degrees Celsius, add the sample when the furnace temperature rises to 400 degrees Celsius, and the sulfur in the sample will burn to form sulfur dioxide;
[0043] Oxidation, add 1 drop of 2g / L methyl red methylene blue mixed indicator to 30ml of 3% hydrogen peroxide solution by mass fraction, pass the gas generated by combustion through the 3% hydrogen peroxide solution to oxidize the sulfur dioxide in it to sulfuric acid;
[0044] Titrate, titrate the sulfuric acid obtained by oxidation with 0....
Embodiment 2
[0058] This embodiment provides a method for determining the content of sulfur element in superphosphate, including the elemental sulfur content S in superphosphate 1 Determination of the sulfur element content S in the sulfate state 2 determination.
[0059] The determination of elemental sulfur content in elemental form includes the following steps in sequence:
[0060] Sampling, weigh 0.3g of sample;
[0061] Combustion, set the temperature of the high-temperature furnace at 750 degrees Celsius, add the sample when the furnace temperature rises to 600 degrees Celsius, and burn the sample so that the sulfur in it is oxidized into sulfur dioxide;
[0062] Oxidation, add 2 drops of 2g / L methyl red methylene blue mixed indicator to 30ml 3% hydrogen peroxide solution, pass the gas generated by combustion through 3% hydrogen peroxide solution to oxidize sulfur dioxide into sulfuric acid;
[0063] Titrate, titrate the sulfuric acid obtained by oxidation with 0.10mol / L sodium hy...
Embodiment 4
[0077] This embodiment provides a method for controlling the content of sulfur in superphosphate. The control method is to measure the solidification stage and aging stage of superphosphate production and the content of sulfur in the finished product. If the sulfur content is higher than the required value, then add more sulfur when feeding, if the sulfur element content is lower than the required value, then add more sulfur when feeding. It is 13.2% to measure the massfraction of sulfur element in the finished product with the present invention, but sulfur content should reach 11.7% in the calcium persulfate that factory produces, so when mixing material in mixer, add 0.015Kg sulfur less in every kilogram of mixed material .
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