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The appearance is different: ferrous sulphate monohydrate is also known as feed grade ferrous sulfate, and the production process adopts a dry white or pale white powder solid which is formed by wet dissolving and dehydration and recrystallization. The ferrous sulfate heptahydrate is obtained as a by-product of the direct titanium dioxide plant and is a pale green or green solid. The ferrous sulfate heptahydrate is larger than the crystal particles of ferrous sulfate monohydrate.
The physical properties are different: ferrous sulfate monohydrate will decompose into ferric oxide and release sulfur dioxide under heating. Its content of water, ferrous sulfate heptahydrate is more than 98%, the molecular weight is 169.9229, and its melting point and boiling point are: 64 ° C and 330 ° C, respectively. The ferrous sulfate heptahydrate has only undergone simple impurity removal treatment and contains seven crystal waters in the titanium white plant. Its content is generally between 80-90%, relatively unstable, there is dripping phenomenon, the molecular weight is 278.05, the melting point is 69 ° C, and the ferrous sulfate heptahydrate is easy to undergo redox reaction with air.
Different uses: Because ferrous sulfate monohydrate is a feed grade, it is commonly used as a feed additive. It has a good effect on supplementing nutrients for the animals that are raised, and prevents the occurrence of anemia in animals. Enhance resistance to disease during livestock growth. It can also be used as a raw material for the production of pigments such as iron oxide red. And gradually applied to the fertilizer market. As a reducing agent, ferrous sulfate heptahydrate is widely used in wastewater treatment as a decolorizing flocculation. It can also be applied to cement to remove toxic chromate from cement, medically used as a blood supplement and so on. Because of its low cost, it is more widely used.
The same point of heptahydrate and ferrous sulfate monohydrate
Since ferrous sulfate monohydrate is prepared by reprocessing ferrous sulfate heptahydrate, the same content contains a large amount of ferrous ions. And they all have redox properties, but the ferrous sulfate monohydrate is not as strong as the ferrous oxide after drying, and iron sulfate is formed after oxidation. Its physical properties are insoluble in ethanol. It can be used as a flower fertilizer, and it has a good effect on the supply of iron.
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