Method for preparing iron oxide red from pyrite roasting residues by using hydrothermal method

Abstract

The invention discloses a method for preparing iron oxide red from pyrite roasting residues by using a hydrothermal method. The method comprises the following steps: adding a sulfuric acid solution into a reaction device, slowly adding the pyrite roasting residues, reacting at the reaction temperature of 110-120 DEG C for 3-5 hours, and filtering the ore pulp, thereby obtaining an acid leaching solution; diluting, regulating the ferrous concentration by using hydrogen peroxide, so that the molar ratio of Fe<2+> to Fe<3+> in the solution is 0.1-0.15, adding stronger ammonia water to regulate the pH value to be 8-10, and fully stirring, thereby obtaining Fe(OH)3 and Fe(OH)2 colloid of the precursor; transferring the precursor into a high pressure kettle, carrying out a hydrothermal reaction, and washing, filtering, drying and grinding the reaction products, thereby obtaining the iron oxide red product. According to the method disclosed by the invention, the iron oxide red product of which various quality indexes meet the first grade requirements in the national standard can be obtained, the particles refer to pseudo cubes of uniform size, and industrial high-quality ammonium sulfate can be obtained from the filtrate of the hydrothermal reaction products.

Description

technical field [0001] The invention belongs to the technical field of pigments, and relates to a method for preparing iron oxide red from pyrite slag by a hydrothermal method. Background technique [0002] Iron oxide red is an ancient and important inorganic pigment. Iron oxide red is insoluble in water and dilute acid, has no oil permeability and water permeability, has strong tinting power and hiding power, can resist acid and alkali, light, high temperature and sun exposure, and is widely used in coatings, building materials, rubber, ink, Industries such as plastics and art paints. [0003] my country's iron oxide red is mainly produced with iron scale as raw material by mixed acid method, with an annual output of more than 500,000 tons, which is the world's largest producer. Pyrite slag is the chemical waste produced by sulfuric acid when pyrite is used to prepare it. Many domestic scholars have conducted research on the preparation of iron-based products using pyri...

AI Technical Summary

Problems solved by technology

At present, there are few reports on the preparation of iron oxide red by hydrothermal method using pyrite slag as raw material