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Water is seven and its relative molecular weight is 246. Therefore, magnesium sulfate monohydrate and magnesium sulfate heptahydrate of the same quality, in which the percentage of magnesium element, magnesium sulfate monohydrate is 1.78 times as much as magnesium sulfate heptahydrate.
In large-scale industrial production, both raw materials are sulfuric acid and magnesium oxide. But the products produced by the same process are also mixed, because some bad manufacturers choose cheap industrial waste acid as raw material to produce magnesium sulfate heptahydrate, in order to reduce production costs, but this practice has a great potential safety hazard, which needs to be analyzed from the source of industrial waste acid.
The main sources of industrial waste acid are metallurgy and electroplating. A large amount of acid is used in metal surface treatment. When the metal examples and other impurities in the acid solution reach a certain concentration and the treatment effect can not meet the technological requirements, the acid solution needs to be reconstituted and replaced. In this process, a large number of waste acid liquids will be produced. These waste acids contain high concentration of acid, heavy metal elements such as cobalt, titanium, chromium, arsenic and various inorganic impurities. Once such industrial waste acid enters the next production stage without treatment, it will pollute its products and even poison them.
Once such magnesium sulfate heptahydrate products are used in agricultural production, they will have a bad impact on the soils it spreads. The acid radical ions and toxic heavy metals carried by impurity acids in industrial waste acids will be enriched in soil, animals and plants and eventually absorbed by human body.
Compared with magnesium sulfate heptahydrate, magnesium sulfate monohydrate using waste acid as raw material is more optimistic. Because of the characteristics of magnesium sulfate monohydrate itself, if waste acid is used as raw material, the product of magnesium sulfate monohydrate will be grey-black instead of normal Milky white. The color difference directly determines the product phase. Therefore, most magnesium sulfate monohydrate manufacturers prefer industrial sulfuric acid (concentration 94-98%) rather than industrial waste acid.
As an important component of aquatic feed and the core element of magnesium supplement compound fertilizer, the quality of magnesium sulfate is related to the quality of the whole product. For the vast number of agricultural enterprises such as feed and fertilizer, choosing a magnesium sulfate supplier with superior quality and stable output is the premise and guarantee to ensure the overall quality of products.