The properties of ferrous sulfate, iron vitriol, ferrous sulphate character (also known as copperas, and iron vitriol) : monoclonal crystals of sky blue or green, odorless, salty and astringent; At the condition of 14.8 degree: the density is 1.8988g/cm3; 15 degrees condition: density of 1.897 g/cm3. The melting point 64 ℃, soluble in water, insoluble in alcohol.Weathered white powder in dry air.Corrosive, rapidly oxidized to yellow brown alkaline ferric sulfate in wet air.At 300 ℃ for anhydride, continue to heat up will be decomposed into ferric oxide, water, sulphur dioxide gas sulphur trioxide.It is mainly used for water purification, gas purification, pigment printing, printing and dyeing industry.GB10531-89 water treatment agent ferrous sulfate main quality index is QYBKSCLQQMA , index name / %, drinking water, industrial water classy article, first-rate, nonconforming product of ferrous sulfate (FeSO4, 7H2O) content ≧ 97.0 94.0 90.0 97.0 94.0, titanium dioxide (TiO2) content ≤ 0.5 0.5 0.75 0.5 0.5,  insolubles content ≤ 0.2 0.5 0.75 0.2 0.5 , free acid (in - H2SO4) content ≤ 0.35 1.0 2.0 , containing arsenic (As)≤ 0.0005 0.0005 0.0005 , heavy metals (Pb) content ≤ 0.002 0.002 0.002 。 The chemical reaction principle of ferrous sulfate in water treatment should be: 6 FeSO4 +KCLO3 + 3 H2O = 2Fe2 (SO4) 3 + KCl + 2 Fe (OH) 3. The resulting Fe(OH)3 is a gelatinous substance,can adsorption impurities suspended solids in the water, have water purification effect.
Feature of ferrous sulfate :
1.Ferrous sulfate is mainly used as flocculant: high efficient flocculant effect, has better decoloring ability, heavy mental removal, degreasing, phosphorus removal, sterilization function, especially for decolorization of printing and dyeing wastewater and removal of COD, electroplating wastewater and ferrite coprecipitation have obvious effect, the price is cheap, a best choice for printing and dyeing, electroplating wastewater treatment products.
2.Ferrous sulfate can also be used as food additives, pigments, raw materials for electronic industry, deodorants of hydrogen sulfide, and catalyst for soil improvement.
Ferrous sulphate, known as alum, is a blue-green crystal or granule, mainly used in iron fertilizer, pesticide, pigment, medicine and so on.Ferrous sulphate packaging storage: 25Kg or 50kg lining polyethylene plastic woven bag, moisture-proof and rainproof.
Ferrous sulfate use for: wastewater treatment, and fertilizer (adjust soil ph value, promote leaf green leaves formation), pesticide, catalyst, disinfectants, magnetic materials, etc.
The use of ferrous sulfate in sewage treatment can be used as flocculant, reducing agent, precipitating agent and so on.
1.As a reducing agent: ferrous sulfate is a strong reducing agent, can be electroplating factory water content chromium wastewater hexavalent chromium reduced to trivalent chromium, instead of expensive sodium sulfite, hydrogen bisulfite, sulfur dioxide and so on. The advantage is not to produce toxic carcinogenic stimulation of the chlorine body (mainly two hydrogen sulfide), low prices.
2.As a flocculant: the most extensive use of ferrous sulfate is as a flocculant, it as a flocculant has the following advantages: fast settlement, sludge particles, small sludge volume and dense, the effect of color removal (very suitable for printing and dyeing, washing and other textile wastewater treatment), Non-toxic and beneficial biological growth (very suitable for use in the subsequent biochemical treatment process of sewage treatment system), do not change the original process, low price, as a flocculant, ferrous sulfate can replace polymeric aluminum, alkali aluminum chloride, polymeric iron, aluminum sulfate, ferric chloride and so on.
3.As biological nutrients: mainly as a biochemical system of microbial iron nutrition, improve the activity of microorganisms in the system, so as to ensure and enhance the efficiency and stability of the system.
4.As sediments, so as to remove sulfide, phosphate and so on, the use of ferrous sulfate treatment of printing and dyeing plant sulfur-containing wastewater.