Production process for preparing iron oxide black by ferrous sulfate solution

Abstract

The invention relates to a production process for preparing iron oxide black by a ferrous sulfate solution. The production process comprises the following steps: (1) discharging the ferrous sulfate solution into a reaction tank; (2) adding a sodium hydroxide solution into the reaction tank, regulating the pH value to alkalinity and generating a ferrous hydroxide solution; (3) introducing air and steam into the solution, carrying out heating oxidation reaction and gradually forming ferrous hydroxide and other intermediate transitional mixed floccules; (4) after heating oxidation reaction for a certain time, gradually dewatering and decomposing, and generating small particles of ferroferric oxide; (5) discharging a prepared ferroferric oxide solution into a filter press and carrying out solid-liquid separation to obtain mother liquid water and filter residues; (6) washing the obtained filter residues, then carrying out filter pressing and obtaining clear ferroferric oxide filter residues and drying by using a drying box; (7) crushing the dried filter residues, packaging and warehousing. According to the production process, recycling of the ferrous sulfate solution is realized, and the iron oxide black is obtained and can be used for preparing pigments.

Description

technical field [0001] The invention relates to the technical field of iron oxide black production technology, in particular to a production technology for preparing iron oxide black from ferrous sulfate solution. Background technique [0002] Ferric oxide, chemical formula Fe 3 o 4 , alias iron oxide black, the production methods of iron oxide black at home and abroad usually include: pure iron oxidation combustion method, iron powder reduction method, mixed iron salt (ferrous and ferric salt) conversion method and other three categories. [0003] The titanium dioxide factory adopts sulfuric acid method to produce titanium dioxide pigment, which is based on ilmenite (FeTiO 3 ) as raw material, using sulfuric acid to decompose the ore, titanium and iron are dissolved as sulfate, after the production of the main product of titanium dioxide pigment and the recovery of by-products of ferrous sulfate, there is still a large amount of acidic wastewater containing ferrous sulfat...

AI Technical Summary

Problems solved by technology

Acidic wastewater cannot be discharged directly, it will pollute the environment, and contains more useful substances