Titanium dioxide identification method

Titanium dioxide identification method
Physical method:
The easiest way is to compare the hand feel, fake titanium dioxide is smoother, and real titanium dioxide is astringent.
If you wash with water, a little titanium dioxide on your hands will wash off the fake ones easily, but it’s not easy to wash off the fake ones.
Take a cup of water, throw the titanium dioxide into it, the ones that float up are true, and the ones that settle down are false (if it is an activated modified product, it will not work).

chemical method:
Mixed with light calcium or heavy calcium: Adding dilute sulfuric acid or hydrochloric acid, the bubbles can make the clarified lime water turbid, because calcium carbonate will react with acid to produce carbon dioxide.
Mixed with Lithopone: Add dilute sulfuric acid or hydrochloric acid to smell of rotten eggs.
It is made into latex paint, iron red is added, and the color is dark, indicating that the poor hiding power is fake or poor quality titanium dioxide.
There are also two better methods:
Using the same PP+30%GF+5%PP-G-MAH+0.5% titanium dioxide, the lower the strength, the more true the titanium dioxide (rutile).
Choose a transparent resin, such as transparent ABS+0.5% titanium dioxide, and measure the light transmittance. The lower the light transmittance, the more true the titanium dioxide.
Production Process
There are two manufacturing methods for titanium dioxide: Sulphate Process and Chloride Process. Among them, 56% are chlorination products, and more than 70% of this product is produced by large titanium dioxide manufacturers such as DuPont in the United States. Titanium dioxide plants in other countries, including China, still use sulfuric acid.
1] Sulfuric acid method
The ferro-titanium powder and concentrated sulfuric acid are subjected to acid hydrolysis to produce titanyl sulfate, which is hydrolyzed to generate metatitanic acid, and then calcined and pulverized to obtain a titanium dioxide product. This method can produce anatase and rutile titanium dioxide. The advantage of the sulfuric acid method is that ilmenite and sulfuric acid, which are available at low prices, can be used as raw materials. The technology is relatively mature, the equipment is simple, and the anti-corrosion materials are easy to solve. The disadvantage is that the process is long, and only intermittent operation is the mainstay. Wet operation requires high consumption of sulfuric acid and water, many wastes and by-products, and large environmental pollution.
2] Chlorination method
The chlorination method uses titanium-containing raw materials to react with chlorinated high-titanium slag, artificial rutile, or natural rutile to form titanium tetrachloride, which is purified by distillation and then gas-phase oxidation; after rapid cooling, After gas-solid separation, TiO2 is obtained. Because the TiO2 adsorbs a certain amount of chlorine, it needs to be heated or steamed to remove it. The process is simple, but it is chlorinated at 1000°C or higher, and there are many chemical engineering problems such as high corrosion of chlorine, oxychloride, and titanium tetrachloride that need to be solved. In addition, the raw materials used are special, which is more costly than the sulfuric acid method. high. Chlorination production is continuous production, the operation of the production equipment is not flexible, startup and shutdown and production load are not easy to adjust, but its continuous process production, the process is simple, the process control points are few, and the product quality is easy to achieve optimal control. In addition, there is no sintering formed by the kiln calcination process, and the primary TiO2 particles are easy to depolymerize, so in appearance, people are used to thinking that the quality of chlorinated titanium dioxide products is better. The advantages of the chlorination method are that the process is short, the production capacity is easy to expand, the continuous automation degree is high, the energy consumption is relatively low, the "three wastes" are less, and high-quality products can be obtained. The disadvantages are large investment, complex equipment structure, high requirements for materials, high temperature resistance, corrosion resistance, difficult maintenance of the device, and difficult research and development.