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

Inactive Publication Date: 2016-11-16
YUNNAN LUFENG QINPAN PHOSPHOR CHEM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for measuring and controlling the content of sulfur in superphosphate, which solves the problem of slow and inconvenient sending of samples to special testing institutions to detect the content of sulfur in chemical fertilizers

Method used

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Experimental program
Comparison scheme
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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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Abstract

The invention discloses a determination method for the content of sulfur contents in superphosphate. The determination method comprises the steps of determining the content S1% of sulfur contents existing in a simple substance form and the content S2% of sulfur contents existing in a sulfate radical state, wherein the content S of the sulfur contents in superphosphate is calculated according to the formula: S=S1+S2, the determination of sulfur simple substances comprises the steps of oxidizing the sulfur simple substances into sulfuric acid and carrying out sodium hydroxide titration, and the determination of the content of sulfur contents in sulfate radicals comprises the steps of generating precipitates from barium ions and sulfate radicals and calculating the content of the sulfur contents in a sample according to the quality of the precipitates. The invention further provides a control method for the content of the sulfur element in superphosphate. According to the determination method, the sampling and the determination at any time in the production process can be realized, and the content of the sulfur element in chemical fertilizers can be efficiently and rapidly monitored, so that the time and the cost are saved; the testing is convenient, the accuracy is high, the error is less than 1%, and the quality of sulfur added when materials are mixed can be regulated and controlled at any time by determining the sulfur contents.

Description

technical field [0001] The invention relates to a method for measuring and controlling the content of sulfur element, in particular to a method for measuring and controlling the content of sulfur element in superphosphate. Background technique [0002] Phosphorus and sulfur are both essential macroelements for plant growth and are of great significance to agricultural production, so some fertilizers will combine phosphorus and sulfur to make compound fertilizers. In the process of processing, it is necessary to control the content of sulfur in chemical fertilizers. Because of the lack of necessary methods, if it is necessary to measure the content of sulfur in chemical fertilizers in actual production, the samples need to be sent to a special testing agency for testing. Therefore, a fast and accurate method A method for determining the content of sulfur in chemical fertilizers is very necessary. Contents of the invention [0003] The purpose of the present invention is to...

Claims

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Application Information

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IPC IPC(8): G01N31/12G01N31/16G01N21/79
CPCG01N31/12G01N21/79G01N31/162
Inventor 陈斌杨志祥
Owner YUNNAN LUFENG QINPAN PHOSPHOR CHEM CO LTD
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