Anhydrous Ferrous Sulfate CAS 7720-78-7

liquid-liquid precipitation method
Fundamental

Utilize ferrous ammonium sulfate solution and sodium sulfide solution to react to form ferrous sulfide precipitate, and then obtain higher purity Anhydrous Ferrous Sulfate through precipitation separation, centrifugation, washing and drying. The reaction equation is as follows:

Figure 1 Anhydrous Ferrous Sulfate reaction equation

Steps

Completely dissolve 2g of sodium sulfide in 10ml of high-purity water to obtain a sodium sulfide solution; weigh 3g of ferrous ammonium sulfate and add water to dissolve it. Slowly add the prepared sodium sulfide solution into the ferrous ammonium sulfate solution, and keep stirring to obtain a black solid suspension. After separation and drying, ferrous sulfide samples can be obtained.

gas-liquid precipitation method
Fundamental

Utilize commercially available ore ferrous sulfide and sulfuric acid to react in the Kipp generator to produce hydrogen sulfide gas, and obtain a solid-liquid mixture containing Anhydrous Ferrous Sulfate particles by hydrogen sulfide gas to ferrous ammonium sulfate solution for a long time. Ferrous sulfide with higher purity can be obtained through precipitation separation, centrifugation, washing and drying. Since the gas hydrogen sulfide produced during the experiment is a toxic gas, all experiments were carried out in a fume hood.

Steps

The gas reaction bottle is equipped with ferrous ammonium sulfate solution, and the tail gas absorption bottle is a dilute sodium hydroxide solution for tail gas treatment. After checking the airtightness of the experimental device, add 150ml~200ml of 50% sulfuric acid solution to the Kipp generator equipped with block Anhydrous Ferrous Sulfate reagent, react for 48 hours, and put the The solid-liquid mixture was taken out to separate and dry.

gas-solid reaction method
Fundamental

Utilize commercially available ore ferrous sulfide and sulfuric acid to react in the Kipp generator to produce hydrogen sulfide gas, pass the hydrogen sulfide gas into the glass tube containing the ferric oxide solid, and grow the ferric oxide solid through the hydrogen sulfide gas Corrosion of time yields ferrous sulfide solids. Then extract and remove sulfur with an organic solvent, and obtain higher-purity ferrous sulfide through precipitation separation, centrifugation, washing and drying.

Steps

Put the ore Anhydrous Ferrous Sulfate in the Kipp generator, and the reaction tube is filled with ferric oxide solid but not too dense (to facilitate the circulation of hydrogen sulfide gas and maximize the use of hydrogen sulfide gas). After checking the airtightness of the experimental device, add 150ml~200ml of 50% sulfuric acid solution to the Kip generator, react for 48 hours, take out the solid in the No. 2 reaction tube for extraction, and then separate and dry to obtain sulfuric acid Ferrous samples. Since the gas hydrogen sulfide produced during the experiment is a harmful gas, all experiments were carried out in a fume hood.