55 results about "Green rust" patented technology

A reducing water purification material having a reducing iron-based precipitate selected from green rust, iron ferrite, reducing iron hydroxide, and a mixture thereof. A wastewater treatment process having steps of adding a reducing iron compound to wastewater, leading the wastewater to which the reducing iron compound is added to a reaction tank and forming a precipitate, separating the formed precipitate by a solid-liquid separation to obtain a sludge, and alkalinizing all or a portion of the separated sludge to form an alkaline sludge followed by returning to the reaction tank, wherein in the precipitation step, the wastewater to which the reducing iron compound is added and the alkaline sludge are mixed and are allowed to react in a non-oxidizing atmosphere under alkaline condition to form a reducing iron compound precipitate as the precipitate, thereby incorporating contaminants in the precipitate to remove the contaminants from the wastewater.

The invention belongs to the technical field of inorganic chemical industry, and in particular relates to a preparation method of green rust, an important intermediate produced in various ferrite production processes. The specific steps are as follows: build a reaction device, use ascorbic acid aqueous solution with a molar concentration of 2.5×10-4 to 7.5×10-4 mol / L as a solvent, and FeSO4 as a solute to prepare a ferrous solution, and place it in a four-necked flask under a nitrogen atmosphere; Place the alkaline solution in one tube of the constant pressure titration funnel, and place the Fe2(SO4)3 solution in another tube of the constant pressure titration funnel; the molar concentrations of FeSO4 and Fe2(SO4)3 solutions are equal; Using magnetic stirring, the solution in the four-necked flask is stirred evenly, the pH value of the solution in the four-necked flask is adjusted to 6, Fe2(SO4)3 solution is added dropwise, and the alkaline solution is added dropwise at the same time, so that the pH value of the solution is maintained at 6; after the Fe2(SO4)3 solution is dripped, record the pH value of the solution, continue to drop the alkaline solution in the solution, and observe the color change of the solution at the same time, until the pH value of the solution is 7, the reaction ends; aging, that is get the desired product. The green rust prepared by the invention has high purity and mild reaction conditions.