Ferrous sulfate heptahydrate 7782-63-0


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  Ferrous sulfate heptahydrate

Another name】Ferrous sulfate; Iron(II) sulfate heptahydrate; Iron(II) sulfate; Copperas; Green copperas.

Description】Light bluish green crystals or particles, odorless, soluble in water, slightly soluble in alcohol, easily oxidized in aqueous solution, corrosive, easily weathered in dry air, easily oxidized to basic ferric sulfate in wet air and turned yellow. Relative density 1.897, melting point 64℃, 56.6℃ into tetrahydrate salt, 65℃ into monohydrate salt, 300℃ into white powder anhydrous substance, temperature to 480℃ began to decompose.

Table 1

Test item AR CP Other
Assay(FeSO4•7H2O) /% 99.0-101.0 98.0-101.0 Custom
Water insoluble /% ≤0.005 ≤0.02
Chloride(Cl) /% ≤0.001 ≤0.005
Total nitrogen(N) /% ≤0.001 -
Phosphate(PO4) /% ≤0.000 5 ≤0.002
Arsenic(As) /% ≤0.000 2 ≤0.000 2
Manganese(Mn) /% ≤0.05 -
Ferric iron(Fe3+) /% ≤0.02 ≤0.10
Copper(Cu) /% ≤0.002 ≤0.01
Zinc(Zn) /% ≤0.005 ≤0.02
Lead(Pb) /% ≤0.002 ≤0.005
Ammonia water does not precipitate (as SO4) /% ≤0.05 ≤0.2

Table 2

Test item Eiectronic grade I Eiectronic grade II Other
Assay(FeSO4•7H2O) /% 99.0-101.0 99.0-101.0 Custom 
Water insoluble /ppm ≤80 ≤80
Arsenic(As) /ppm ≤2 ≤2
Manganese(Mn) /ppm ≤50 ≤300
Ferric iron(Fe3+) /ppm ≤200 ≤200
Copper(Cu) /ppm ≤20 ≤20
Zinc(Zn) /ppm ≤20 ≤50
Lead(Pb) /ppm ≤20 ≤20
Calcium(Ca) /ppm ≤20 ≤20
Sodium(Na) /ppm ≤20 ≤20
Magnesium(Mg) /ppm ≤20 ≤20
Nickel(Ni) /ppm ≤50 ≤50
Cobalt(Co) /ppm ≤50 ≤50
Aluminum(Al) /ppm ≤20 ≤20
Cadmium(Cd) /ppm ≤20 ≤20
pH(50g/L,25℃) 2.5-3.5 2.5-3.5

Table 3

Test item Ingredients High purity Other
Assay(FeSO4•7H2O) /% 98.5-104.0 99.5-104.5 Custom 
Chloride(Cl) /% ≤0.03 -
Arsenic(As) /ppm ≤2 ≤3
Manganese(Mn) /% ≤0.1 -
Ferric iron(Fe3+) /% ≤0.5 -
Zinc(Zn) /% ≤0.05 -
Lead(Pb) /ppm ≤20 ≤2
pH(0.5g/10ml,25℃) 3.0-4.0 -
Mercury(Hg) /ppm ≤3 ≤1

Table 4

Test item Feed grade Industrial grade Other
Assay(FeSO4•7H2O) /% ≥98.0 ≥90.0 Custom
Titanium dioxide(TiO2) /% - ≤1.0
Water insoluble /% - ≤0.5
Free acid(H2SO4) /% - ≤2.0
Arsenic(As) /ppm ≤2 ≤10
Lead(Pb) /ppm ≤20 ≤20
Cadmium(Cd) /ppm - ≤5
Mercury(Hg) /ppm - ≤1
Chromium(Cr) /ppm - ≤50
Iron(Fe) /% ≥19.7 -

Use】Used for the production of high-end lithium battery cathode materials, iron phosphate raw materials; Used as analytical reagent for the analysis and determination of platinum, selenium, nitrate, nitrite, etc. Also used for photographic plate, ferrite raw materials, iron strengthening agent and fruit and vegetable color agent; Agriculture can be used as pesticide and fertilizer, can prevent and control wheat smut, apple and pear scab, fruit tree rot; It is also a kind of microelement fertilizer, which can accelerate the green of rice and beet, adjust the pH value of soil, replenish iron for plants, and remove the moss and lichen of tree trunks. Manufacturing magnetic iron oxide, iron oxide red and iron blue inorganic pigments, iron catalyst and high-end polymeric iron sulfate raw materials; Medicine used as local astringent and blood tonic; Food grade used as nutritional supplements, such as iron enhancer and fruit and vegetable color agent; Feed grade is used as an iron supplement in feed processing.