Polyferric Sulfate Classification System

According to the national standards, product forms and application scenarios, there are clear classification of Polyferric Sulfate, as follows:

I. Classification according to national standards (GB/T14591-2016)

●First class

Total iron content: liquid> 11.0%, solid> 19.5%;

Salinity: 8.0%-16.0%;

Heavy metal limit: arsenic (As) less than or equal to 0.0001%, lead (Pb) less than or equal to 0.0002%, cadmium (Cd) less than or equal to 0.00005%;

Application scenario: Drinking Water Treatment, raw materials should meet the class I standard of ferrous sulfate.

●conforming article

Total iron content: liquid> or = 11.0%, solid> or = 19.5% (the same as grade I, but the allowable value of impurities is higher);

Salinity: 5.0%-20.0% (wider range);

Heavy metal limit: arsenic less than or equal to 0.0005%, lead less than or equal to 0.001%, cadmium less than or equal to 0.00025%;

Application scenarios: industrial water and non-potable water treatment.

2. Classification according to product form

●Liquid products

The total iron content is usually 11%-16%, and the density is greater than or equal to 1.45 g/cm³, so the hydrolytic stability needs to be controlled.

●Solid products

The total iron content is divided into ordinary grade (≥19%) and spray grade (≥23%), the latter has higher purity and faster dissolution.

3. Classification according to application scenarios

●Drinking water grade: it should meet the standard of first class, and strictly control heavy metals and impurities.

●Industrial wastewater grade: suitable for printing and dyeing, electroplating and other highly polluting wastewater, allowing higher impurity content.

●Special function level: such as phosphorus removal special type, low temperature and low turbidity water treatment type, through adjusting the salinity and iron content to optimize the performance.

4. Grading of other enterprise standards

Some manufacturers will launch high purity grade (such as spray drying type) or customized grade, with total iron content up to 21%-23%, for precision industrial scenarios sensitive to impurities.

The classification of polyferric sulfate is mainly based on the iron content, salt base and impurity limit in the national standard, combined with the differences in product form and application scenarios. Users need to select the corresponding level of products according to the specific use (such as drinking water/industrial water), and confirm the compliance of indicators through the test report.