Anhydrous reaction method for preparing polymeric ferric sulfate

A technology for polymerizing ferric sulfate and water reaction, applied in the direction of ferric sulfate, chemical recovery, etc., can solve the problems of long reaction time, large amount of catalyst, many equipment, etc., and achieve the effect of reducing production cost, energy consumption, and waste gas.

Inactive Publication Date: 2016-03-02
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An anhydrous reaction method for preparing polymeric ferric sulfate is disclosed. According to the method, 2-20 tons of industrial ferrous sulfate and 0.2-1.8 tons of sulfuric acid are added into a specialized stainless steel reaction unit with its volume being 2-20 cubic meters, and the ratio of ferrous sulfate to sulfuric acid is 10:1; in a nearly vacuum state, 2.5-3.5 kg of a catalyst is poured according to each ton of ferrous sulfate, the catalyst is sodium nitrite or dilute nitric acid, and dissolution and reaction are carried out in the same unit; after an oxygen valve reaches 0.02 MPa, pump type stirring is started, pressure is maintained at 0.02-0.04 MPa, reaction temperature is within 100 DEG C, and the reaction lasts for 3-10 h; after qualified through sampling analysis, an emptying valve is turned on, and a few tail gas is sent into an alkali absorption tower to be treated; after saturated, lye returns to be recycled as a catalyst; polymeric ferric sulfate is directly put into a spray drying tower to be dried, so as to obtain a polymeric ferric sulfate spray-dried product. Moisture content of the produced polymeric ferric sulfate is reduced to 25%, standard coal is saved by 65 kg, energy consumption is reduced by 50%, exhaust gas is minimized by 2/3, and production cost is greatly decreased.

Application Domain

Iron sulfatesChemical recycling

Technology Topic

Iron(III) sulfateChemistry +11


  • Experimental program(1)

Example Embodiment

[0009] The method for preparing polymeric ferric sulfate by anhydrous reaction, its steps are:
[0010] 1. In a professional stainless steel reactor with a volume of 2-20 cubic meters, add 2-20 tons of industrial ferrous sulfate and 0.2-1.8 tons of sulfuric acid; industrial ferrous sulfate: sulfuric acid is 10:1;
[0011] 2. Under the condition of close to vacuum, put 2.5-3.5kg of catalyst into the stainless steel reaction device per ton of ferrous sulfate, and use sodium nitrite or dilute nitric acid as the catalyst;
[0012] 3. Open the oxygen valve of the reaction device, after reaching 0.02MPa, turn on pump stirring, maintain the pressure at 0.02-0.04MPa, and the reaction temperature within 100℃ until the oxygen pressure does not change; after 3-10 hours, after sampling and analysis are qualified , Open the vent valve, and send a small amount of tail gas to the alkali absorption tower for treatment. After the alkali liquor is saturated, it can be returned to the catalyst for recycling;
[0013] 4. The reaction liquid is processed according to the requirements of the product:
[0014] If the liquid polyferric sulfate is prepared, add about 500kg of tap water per ton of ferrous sulfate, and mix evenly, that is, a liquid polyferric product that reaches the national standard.
[0015] If the polyferric sulfate is directly injected into the spray drying tower for drying, the water content is 20-30%, and the spray dried product is prepared. Its energy consumption is 30-50% of the existing process.
[0016] If the solid polyferric sulfate dry product is produced, the polyferric sulfate is directly pumped into the drying room, and the temperature is maintained at 50-70℃. According to the thickness of the material, it can be crushed within one day at the earliest to obtain a qualified solid product.


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