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Similarities and differences between ferrous sulfate monohydrate and ferrous sulfate heptahydrate

2020-11-14 12:01:22
Times

1、 The similarities of ferrous sulfate monohydrate and heptahydrate are as follows

Because ferrous sulfate monohydrate is prepared by secondary processing of ferrous sulfate heptahydrate, it contains a large number of ferrous ions as well as ferrous ions. All of them have redox property, but the oxidation property of ferrous sulfate monohydrate after drying is not as strong as that of ferrous sulfate heptahydrate. The physical properties are insoluble in ethanol. It can be used as flower fertilizer to supply iron to plants.


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2、 The differences between monohydrate and heptahydrate are as follows

1. Different appearance: ferrous sulfate monohydrate, also known as feed grade ferrous sulfate, is produced by wet dissolving, removing impurities, dehydration and recrystallization. Ferrous sulfate monohydrate is grayish white to beige powder with astringent taste, which is more difficult to oxidize and easier to preserve than crystalline ferrous sulfate. Ferrous sulfate heptahydrate is a by-product of direct titanium dioxide plant, which is blue-green monoclinic crystal or particle, odorless, weathering in dry air. The crystal size of ferrous sulfate heptahydrate is larger than that of ferrous sulfate monohydrate.

2. Different physical properties: ferrous sulfate monohydrate will decompose into iron oxide after heating, releasing sulfur dioxide. Its molecular weight is 169.9229, melting point and boiling point are 64 ℃ and 330 ℃ respectively. Ferrous sulfate heptahydrate contains seven kinds of crystal water after simple impurity removal treatment in titanium dioxide plant. Its content is generally between 80% - 90%, unstable, dripping. Its molecular weight is 278.05 and melting point is 69 ℃. Compared with ferrous sulfate monohydrate, ferrous sulfate heptahydrate is prone to redox reaction with air.

3. Different uses: ferrous sulfate heptahydrate is mainly used for water purification and industrial wastewater treatment, with bactericidal effect. It can be used as an agricultural insecticide to control wheat head smut, apple and pear scab and fruit tree canker. It can also be used as fertilizer to remove moss and lichen from tree trunks. It is a raw material for producing magnetic iron oxide, iron oxide red and iron blue inorganic pigments, iron catalyst and polymerized ferric sulfate. It is used as external astringent and blood tonic in medicine. In addition, it is also used as a chromatographic reagent. Food grade can be used as nutritional supplements, such as iron fortifier and fruit and vegetable colorant. In gardening, ferrous sulfate is used to kill mosses. Ferrous sulfate monohydrate is a kind of feed grade mineral additive, which is the supplement of iron for animal feeding. It is closely related to the hematopoietic function, oxygen transport and intracellular biological oxidation process of animals. Iron is an important component of hemoglobin, myoglobin, cytochrome and various oxidases.

4. The preparation methods are different: ferrous sulfate heptahydrate is treated with dilute sulfuric acid and iron filings to precipitate ferric sulfate by crystallization. Its content is 89-92%. Heptahydrate sulfate is a kind of cheap iron. It is widely used and can be accepted by most customers. The crystallization water in the product of ferrous sulfate heptahydrate was removed by centrifuge, and then dried to obtain ferrous sulfate monohydrate. Its content is 98-99%. The price of ferrous sulfate monohydrate is several times that of sulfuric acid heptahydrate.


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