Discussion on the causes of excessive chloride ions during phosphate production
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What are the reasons for excessive chloride ions during phosphate production?
What is the phosphate product and its approximate process? To facilitate discussion.
To produce sodium tripolyphosphate, the production process is: phosphoric acid, pure (liquid) alkali - neutralization - drying - polymerization - crushing - packaging - warehousing.
The high chloride ions in raw water may be one of the reasons
Improve the quality (salt content) of raw alkali and process control.
Personally, I think there are the following reasons: First, due to water quality. In order to disinfect the self-prepared water used by enterprises to produce food-grade phosphate products, excessive chlorine-containing disinfectants are added, resulting in a certain residual chloride ion; Second, due to raw material reasons, the sodium carbonate used by enterprises to produce food-grade phosphate products is not pure enough. In particular, some companies use industrial-grade sodium carbonate to produce food-grade phosphate products in order to reduce costs, resulting in excessive chloride ions. This post was finally written by scst350 Edited at 2009-4-7 23:04 ]
The water quality is secondary, the chloride ions brought in by the raw materials are the main one. Generally speaking, the amount of disinfectant used is about a few PPM, and the residual chloride ions are less than 0.5PPM, which should be within the standard. However, the raw materials may bring much more than a few PPM, and basically remain in the product, causing chloride ions to exceed the standard.