Rutile Titanium Dioxide
Product introductionRutile titanium dioxide is a rutile titanium dioxide with high resistance to powder by using advanced hue and particle size control technology, zirconium, silicon and aluminum composite inorganic coating and special organic treatment agent for surface modification;Suitable for various applications with special requirements on weather resistance.
Main features:High weather resistance: durable in high temperature, strong light and high salt fog environment, not easy to yellowing and powdery;Dispersity: good wettability and easy to grind when used;Low oil absorption: in paint, ink application process to maintain good fluidity.Application: all kinds of decorative paint;Architectural paint (outdoor use);Automotive finish paint;Plastic profiles.
Related points of rutile titanium dioxide are listed below:Stability of titanium liquid: stability, also known as stability, is in titanium dioxide production, titanium liquid in the condition of change, early hydrolysis and precipitation of white colloid particles tend to occur, the strength of this tendency is called the stability of titanium liquid.The property which indicates the strength of this tendency is called the stability of titanium liquid.
Early hydrolysis of titanium liquid: generally speaking, before to make late after hydrolysis acid solution, titanium liquid should not contain metatitanic acid and titanate are the two kinds of colloidal particles, but sometimes in titanium liquid leaching, reduction, transmission and storage process, due to improper operation or condition changes, and titanium in liquid in the two white colloidal substance, this phenomenon is called early hydrolysis of titanium liquid.Acidolysis rate: the percentage of total soluble titanium salts (measured by TiO2) in solution to the total titanium contained in ilmenite (measured by TiO2) is called acidolysis rate.Acidolysis rate of total titanium content in solution (%) =(total titanium content in solution/total titanium content in ore powder) *100.Residue of titanium liquid: after decomposition of ilmenite with sulfuric acid, the solution obtained by leaching is a complex system of turbidness and vagueness.This solution has the properties of both true solution and colloidal solution, containing soluble sulfate mainly titanium and iron, and insoluble, larger suspended mechanical impurities and smaller particles, with high stability of colloidal impurities.The last two insoluble solid impurities are called the residue of liquid titanium.Iron to titanium ratio: The ratio of total iron content and total TiO2 content in titanium liquid is called iron to titanium ratio, and its formula is as follows: Total Fe content (g/ L) Iron to titanium ratio = Total Fe content (g/ L)/total TiO2 content (g/ L) The level of iron to titanium ratio has a certain influence on the particle size and structure of mettitanic acid in hydrolysate.Therefore, in the production of titanium dioxide, especially in the production of titanium dioxide coating, must be controlled in a certain range of iron titanium ratio.
Concentration of titanium liquid;Water in titanium liquid is solvent and volatile, while titanium oxide sulfate, titanium sulfate and ferrous sulfate in titanium liquid are solutes and non-volatile.By means of heating, the solvent (water) in titanium liquid is gradually vaporized and eliminated, so that the concentration of solute gradually increases, this process is called concentration.
Quality requirements of titanium dioxide for coating: A, good whiteness;B, good abrasive wettability;C, good weather resistance;D. Good chemical stability;E, small particle size, covering power, high extinction power, opacity and gloss.
Hydrolysis rate: Hydrolysis rate is a value reflecting the degree of completion of hydrolysis.That is, the percentage of liquid TiO2 converted to solid TiO2.The high or low hydrolysis rate represents the high or low conversion rate of TiO2 in titanium liquid into solid phase, respectively.
Sedimentation rate: the sedimentation rate of mettitanate particles in hydrolyzed grout is called sedimentation rate.It is a value reflecting the hydrolysis quality and the size of titanate particles.High sedimentation rate, titanate particles on the fine;Low sedimentation rate, titanate particles on the coarse.
Salt treatment: Mettitanic acid in the calcination before adding a small amount of chemical additives to modify the process, known as salt treatment, also known as pre-treatment.Titanium dioxide post-treatment;The post-treatment of titanium dioxide is the process of surface modification of the particles that meet the requirements after the particle size classification of the crushed titanium dioxide particles.
Powdery, aging, weather resistance: used at outdoor paint material, through sun and rain, paint film is destroyed gradually, its surface layer loses luster gradually, pigment grain segregation comes out, become a layer can be wiped loose powder, this kind of phenomenon is called powdery.In powdery while, white paint can flout yellow, lubricious paint can fade, this kind of phenomenon calls paint film aging.Paint film can withstand this degree of aging, known as weather resistance.
Dispersion: The manufacture of paints, in fact, by grinding or stirring the pigment in a good dispersion of the various base materials in a sticky liquid.The degree of dispersion of pigment in the medium and the stability of dispersion in the dispersion system are called dispersion.
Sulfuric acid decomposition method of ilmenite: according to the concentration of sulfuric acid involved in the reaction and the state of the final reaction product, ilmenite acid solution method is divided into three kinds, namely liquid phase method, two phase method, solid phase method.
Solid phase acidolysis: using more than 80% sulfuric acid, the reaction is fierce and rapid, completed within 5~30min, the reaction temperature is higher than 250℃.The purpose of curing after acidolysis reaction, its purpose is to let the solid phase gradually cooling, in this cooling process, let a part of the unacidolized mineral powder continue to act with the existence of free acid, to improve the acidolysis rate.
Rutile titanium dioxide
Reduction of titanium solution: The leaching titanium solution contains both ferrous sulfate (FeSO4) and ferric sulfate Fe2(SO4)3. Ferrous sulfate is stable in acidic solution and begins to hydrolyze only when PH value is greater than 5.Ferric sulfate begins to hydrolyze in acidic solution of pH 2.5 to form ferric hydroxide precipitate.In partial Titanic acid washing, when the pH reaches 2.5, hydrogen oxide precipitation will be generated mixed in partial Titanic acid, until the calcination will become red brown iron oxide mixed in the product, and affect the whiteness of titanium dioxide.Therefore, the presence of ferric iron is not allowed in titanium solution and it must be reduced to ferric iron.
Purpose of freezing crystallization of titanium liquid: there is a large amount of ferrous sulfate in titanium liquid obtained from ilmenite after acid hydrolysis and then leaching with water.The purpose of freeze crystallization is to make ferrous sulfate crystal precipitation, and then through filtration, so that ferrous sulfate separated from titanium solution.
Purification of titanium liquid: most of the residue is removed by sedimentation and ferrous sulfate crystal is removed by freezing crystallization of titanium liquid, still contains some incomplete settlement and small particles of trace solid phase.These solid phase is very fine, the surface may have a certain charge, is a colloidal substance, due to the small particle size, in the coarse filtration of ferrous sulfate crystal, can pass through the filter and stay in the filtrate;In addition, there are soluble impurities other than titanium in liquid titanium, and harmful impurities must be removed.Filter the titanium liquid, is to remove the solid phase, a means of cleaning the titanium liquid.The purpose of liquid concentration: the particles of mettitanic acid prepared by low concentration of titanium liquid are coarser, and the pigment properties of titanium dioxide prepared are poor.In order to obtain fine and uniform Titanic acid by hydrolysis of titanium solution and to obtain titanium dioxide with superior pigment performance, it is necessary to concentrate titanium solution with low concentration through crystallization filtration.
The role of adding seed to hydrolysis first: seed is the key to determine the shape and size of hydrolysate particles and the performance of the final product, and is the guide to induce the correct thermal hydrolysis.The addition of seed crystal has two functions: one is to ensure that the size of the prepared particles is appropriate and uniform, and there is a certain structure of hydrated titanium dioxide;Second, it can speed up the hydrolysis, make the hydrolysis more complete, get higher hydrolysis rate and get excellent pigment properties of titanium dioxide.
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