Detection method for growth of metatitanic acid particles in hydrolytic process of titanyl sulfate

Abstract

The invention discloses a detection method for growth of metatitanic acid particles in a hydrolytic process of titanyl sulfate. The diameter of hydrated titanium dioxide is represented by the tested optical property of the hydrated titanium dioxide; the detection method comprises the following steps: adding carbon black into polyurethane, performing sand grind and crushing by using 95 zirconium beads for 30-120 min, and then filtering by using a sieving mesh to obtain carbon black slurry; adding carboxymethyl cellulose or gas-phase sodium nitrite into aqua regia or water, then stirring and dispersing for 8-15 min to obtain thickened slurry; mixing the carbon black slurry and the thickened slurry, then adding anionic polyacrylamide, stirring, dispersing and uniformly mixing to obtain blackslurry; pulping and dispersing hydrated titanium dioxide filter cakes to prepare hydrated titanium dioxide slurry with density of 1.1-1.3 g / ml; uniformly mixing the hydrated titanium dioxide slurry and the black slurry, and then uniformly coating a layer of black slurry film onto a transparent glass plate by using a wet film preparation device; and testing the optical property of the glass plate coated with the black slurry film by using a colorimeter. The detection method disclosed by the invention has the beneficial effects that operation is simple; and the size of the diameter is represented by a optical property b value or Z-X value, detected by using the colorimeter, of the hydrated titanium dioxide, wherein the smaller the b value is or the larger the Z-X value is, the smaller the diameter is.

Description

technical field [0001] The invention relates to a method for detecting particle diameters, in particular to a method for detecting the growth of metatitanic acid particles in the hydrolysis process of titanyl sulfate. Background technique [0002] At present, domestic titanium dioxide is mainly produced by sulfuric acid process, and the production process is very lengthy, among which the production of rutile titanium dioxide is more complicated. After the raw ore is crushed, acidolysis with sulfuric acid turns ferric titanate into soluble titanyl sulfate and ferric sulfate, then unreacted sodium nitrite and other substances are separated and removed by sedimentation, and most of the sulfuric acid is removed by vacuum crystallization After ferrous iron, it is purified and concentrated to the concentration required for subsequent hydrolysis. During hydrolysis, titanyl sulfate becomes hydrated titanium dioxide, and then the hydrated titanium dioxide undergoes first washing, bl...

AI Technical Summary

Problems solved by technology

At present, the diameter of hydrated titanium dioxide is mainly detected by the Malvern laser particle size analyzer. Although it is convenient and fast, this method uses the principle of light scattering in the detection, and the small diameter cannot be detected, so it cannot truly reflect the diameter of the product. At the same time It is also impossible to achieve good process control based on the results

[0004] The optical properties of titanium dioxide are very important basic pigment properties of titanium dioxide. Because the test of optical properties of hydrated titanium dioxide is different from that of titanium dioxide pigments, the filter cake of hydrated titanium dioxide contains a lot of water, which cannot be achieved by using ordinary formulas because the slurry is too diluted. Therefore, there is currently no method for specifically testing the optical properties of hydrated titanium dioxide to characterize the diameter of hydrated titanium dioxide