What is the iron ion content in industrial soda ash?
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In the synthesis of an organic compound, sodium carbonate is used as a neutralizing agent. The synthesis reaction system requires that the iron ion concentration be kept below 10 ppm. I wonder whether industrial-grade soda ash can meet this requirement, or whether it is possible to remove iron ions by precipitating the prepared soda ash solution – with the iron ions settling at the bottom of the solution and then being removed. Please give me some advice, thank you!
Parameter Name: Premium Grade, First-Class Grade, Qualified Grade. Total Alkali Content (as % of Na2CO3 on a dry basis) %: ≥ 99.2, 98.8, 98.0. Sodium Chloride Content (as % of NaCl on a dry basis) %: ≤ 0.7, 0.9, 1.2. Iron Content (on a dry basis) %: ≤ 0.003, 0.006, 0.010. Water-Insoluble Matter Content %: ≤ 0.03, 0.10, 0.15. The food additive sodium carbonate is in the form of white powdery crystals, and its use must comply with the requirements specified in the table below. Sodium carbonate as a food additive must pass the tests in accordance with GB1886—92 standards. Parameter Name: Total Alkali Content (as Na2CO3) %: ≥ 99.2. Chloride Content (as NaCl) %: ≤ 0.70. Iron Content (as Fe) %: ≤ 0.0040. Water-Insoluble Matter Content %: ≤ 0.040. Loss on Ignition: ≤ 0.80. Heavy Metal Content (as Pb) %: ≤ 0.001. Arsenic Content (as As) %: ≤ 0.0002
Based on the data provided by a fellow resident on the 2nd floor, industrial soda ash should be able to meet the process requirements for the operating conditions mentioned by the original poster.
**The standard for Class II top-quality products is less than 35 ppm, but in some well-established manufacturing plants the actual control level is around 10 ppm, with some achieving levels of around 6 ppm, which fully meets your requirements. Furthermore, it is unlikely for iron ions to precipitate; the precipitates that appear in soda ash solutions are mostly protective layers of iron sulfide or rust residues that have fallen off from the inner walls of the reactors during the production process.