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The sulfur determination device consists of an air purifier, a controller, an incinerator, an electrolytic cell and a stirrer. It is mainly used to determine the total sulfur content in coal, steel and various minerals. It is the preferred and necessary instrument for laboratories in departments such as coal, electricity, chemical industry, building materials, metallurgy, geological exploration, commodity inspection, and environmental protection testing.
Analysis principle
The coal sample is burned in the purified air flow under the high temperature condition of 1150 °C and contains all kinds of sulfur Coal is destroyed. It is decomposed by combustion and carried by airflow into the electrolytic cell where it combines with water to form H2SO3 as it destroys the dynamic equilibrium of the original iodine-iodide ion pair in the electrolytic cell;
The amount of current needed to restore the original dynamic equilibrium is directly related to the amount of burned and decomposed sulfur in the coal sample, which can be measured and calculated by the microprocessor. So we can determine the total sulfur content in coal.
The coal sample is burned in the purified air flow at a high temperature of 1150 °C, and various forms of sulfur in the coal are decomposed into SO 2 and a small amount of SO 3 and escaped. The reaction is as follows:
Coal (organic matter) + O2 → CO2 ↑+ H 2 O + SO2 ↑+ CI2 ↑+ ...
4FeS 2 + 11O 2 → 2Fe 2 O3 + 8SO 2 ↑
2ΜSO4 → 2MO + 2SO 2 ↑+ O2 ↑ (Μ means metal element)
2SO 2 + O 2 → 2SO 3 ↑
This produced SO 2 and a smallA large amount of SO3 are brought into the electrolytic cell by the air flow and combine with water to form H 2 SO 3 and a small amount of H2 SO 4 destroy iodine - In the equilibrium of the potassium iodide pair, the device immediately uses the iodine generated by the automatic electrolysis of potassium iodide, to oxidize and titrate H 2 SO 3 . The reaction formula is:
anode;2I - –2e→I 2
cathode;2H + + 2e → H 2
The reaction formula of the iodine oxidation H 2 SO 3 is: I 2 + H 2 SO 3 + H 2 O → 2I - + H 2 SO4 + 2H +
Created by electrolysis Iodine. The power consumed is recorded by the controller and the corresponding milligrams of sulfur content is calculated. The total sulfur content (%) in the coal can be calculated by dividing the milligrams of sulfur contained in the coal sample by the weight (mg) of the coal sample.
The principle of the law
According to the principle of coulometric titration wed the coal sample is burned in the cleaned air flow under the high temperature condition of 1150℃ and the action of the catalyst, and all the sulfur in the coal is burned and decomposed into SO2 and a small amount of SO3 gas, and the cleaned air flow is sent into the electrolytic cell to To produce H2SO3 or a small amount of H2SO4, H2SO3 is immediately oxidized to H2SO4 by I2(Br2) in the electrolyte, and so on. This causes I2(Br2) to decrease and I(Br) to increase in the solution, thereby the equilibrium state of the electrolyte is destroyed and shows that the potential between the electrodes is increasing;
The instrument switches automatically, judges the start of electrolysis and controls the appropriate magnitude and time of the electrolysis current so that the electrolysis electrode I2 (Br2) produced equals the amount consumed by the H2SO3 reaction, returning the electrolyte to a balanced state Repeat Voprogress to the end of the test.
The instrument calculates the total sulfur content in the sample according to Faraday's law of electrolysis based on the integration of the current consumed by the electrolysis to produce I2 (Br2).
