Process for preparing patina

Abstract

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.

Description

technical field [0001] 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. Background technique [0002] At present, green rust is an important intermediate product, and the research on its formation can not only provide theoretical guidance for the preparation of nano-scale ferrite, but also have application value in metal corrosion, environmental engineering and other related fields. In recent years, researchers have begun to synthesize green rust as the final product, and the commonly used processes are oxidation and co-precipitation. [0003] The oxidation method is to precipitate Fe(II) under anaerobic conditions to form Fe(OH) 2 suspension, and then partially oxidized to produce green rust. Although the principle of oxidation method to prepare green rust is simple, it is difficult to control the oxidatio...

AI Technical Summary

Problems solved by technology

Co-precipitation method requires strict control of oxygen in actual operation to achieve anaerobic operation, which brings difficulties to research and increases operating costs

In addition, there are needles in the co-precipitation synthesis product, and the product yield needs to be improved.

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