Working Principles: The filtered titanium dioxide hydrolysate is sent to the tail of titanium dioxide rotary kiln with certain inclination. The combustion mixing chamber at the end of kiln head can send clean flame and hot air into the kiln body to dehydrate and calcine filter cake. After the hydrolyzed titanium dioxide filter cake has been hydrated at a temperature more than 1000, and calcined, under the help of titanium dioxide rotary kiln, it can roll along the circumferential direction as well as move along the axial direction from the high end to lower end until it finally finishes dehydration and calcination. Finally, the dehydrated and calcined titanium dioxide will be sent to a cooler through the double hydraulic discharge valve. The cooled and screened material is final titanium dioxide products.
Industrial pigments play an important role in the performance and durability of many products. In addition to serving as a coloring agent, pigments can also offer protection against corrosion and even UV rays; pigments are all around us, from building materials and concrete, to textiles, papers, printing inks, artists paints, and more.
An increasing demand for specialty products, combined with prolific use in plastics, paints, coatings, and other applications has experts estimating that the pigment market will see a CAGR of 4.5% between 2016 and 2024.
While there are many potential avenues used to produce pigments, many of these processes have one piece of equipment in common: the rotary kiln. Rotary kilns play an integral role in producing many of the high quality pigments industries rely on today.
Rotary kilns are a high temperature thermal processing device used throughout many of these processes to cause a physical change or chemical reaction in the material in order to impart the intended pigment properties. They are often used to carry out the diverse objectives pigment producers require, such as thermal decomposition, oxidation, calcination, reduction, and more.
Processing conditions can have a significant impact on the properties of the pigment and must be carefully controlled to achieve the desired results. This careful control is one of the advantages of the rotary kiln, which can be engineered to create the exact processingatmosphere and conditions required to influence pigment properties such as color, particle size, and even tinting strength. Typical customized design considerations include:
Titanium dioxide (TiO2) is the most commonly used material for creating white pigments. In producing TiO2 pigments, the rotary kiln is critical to carrying out one of two primary methods of production: The Sulfate Process.
The Sulfate Process is typically used for lower grade ores. In this process, the titanium ore goes through various steps in order to extract the titanium dioxide and produce it in a hydrated form that can be calcined.
The direct process relies first on reducing a zinc-containing raw material or metal. This is carried out in a rotary kiln at high temperatures with coal as the reducing agent. Once the material is reduced to zinc, the metal vapor can be oxidized to produce zinc oxide.
There are a few variations on the indirect process, which involves the melting and vaporization of zinc-containing metals, followed by oxidative combustion. In one variation on this process, the rotary kiln is used to carry out these objectives. The advantage in this setting is that the heat of combustion can be utilized elsewhere in the plant.
Calcination of Filter Cake: Barium sulfate and zinc salt are mixed to create a uniform solution. Crystallites of raw lithopone are formed and the resulting filter cake is calcined in a direct-fired rotary kiln. Upon calcination, the mixture goes through a number of additional steps including quenching, classification and separation, thickening, filtering, washing, drying, and grinding in order to produce a suitable pigment.
Iron oxides provide a diverse range of earth tone hues to the pigment industry. In the production of iron oxide pigments (IOPs), rotary kilns can be used to carry out a variety of different objectives.
The rotary kiln is used in the production of IOPs in the Laux process, and can also be used after any of the three main IOP production methods in order to carry out calcination on the pigments to produce a variation of red hues.
Testing is first carried out at batch scale to gather initial process data and define the parameters that will produce the desired product. This may include any number of factors, but generally includes gathering data on residence time, temperature profile, airflow, and more. Samples may also be produced for field testing needs.
The data gathered during batch testing can then be used in continuous, pilot-scale testing trials to develop the data necessary for process scale-up. Various test kilns are available in the FEECO Innovation Center to accommodate all pigment testing possibilities. Our thermal testing capabilities are also complemented by our agglomeration (particle size enlargement) testing services and system expertise.
The examples listed here represent just a few of the methods in which the rotary kiln provides a key processing medium to produce an ideal pigment product. The customizability of the rotary kiln to carry out various objectives makes the rotary kiln an ideal process setting for both the production and enhancement of many types of pigments. To find the ideal process solution, testing at batch and pilot scale are often a necessity.
In addition to our thermal testing capabilities offered in the Innovation Center, FEECO provides custom rotary kilns and calciners for all of your pigment processing needs. Our highly engineered systems are designed around your exact specifications and requirements to provide optimal processing. In addition to our rotary kilns, we also offer a variety of agglomeration equipment for improving the handling qualities of pigments, as well as a wide range of material handling equipment. For more information on our pigment processing capabilities, contact us today!
A rigorous one-dimensional dynamic model of a rotary kiln for calcination of titanium dioxide white pigment is developed. The regenerative heat transfer in the kiln wall is described by a new mixed numerical/analytical approach. The model is validated by means of a dynamic test case representing a 15-day period of plant operation. The required process data are captured within a measurement campaign on a kiln run by TRONOX Pigments GmbH, Krefeld-Uerdingen, Germany. The predictive accuracy of the model is estimated by means of a sensitivity analysis considering uncertainties of model parameters and measured input values. The actual agreement between simulation and measurement results is significantly better than indicated by the sensitivity analysis.
Development of a dynamic model of a rotary kiln and extensive validation by means of a measurement campaign on industrial plant. Simulation results in better agreement with measurements than suggested by steady-state sensitivity analysis. Results indicate that simulation of kiln behavior with quantitative accuracy is possible.
Titanium dioxide, white solid or powdered amphoteric oxide, widely used in coatings, plastics, paper, printing inks, chemical fiber, rubber, cosmetics and other industries. It has a high melting point and is also used in the manufacture of fire-resistant glass.
Titanium dioxide, white solid or powdered amphoteric oxide, widely used in coatings, plastics, paper, printing inks, chemical fiber, rubber, cosmetics and other industries. It has a high melting point and is also used in the manufacture of fire-resistant glass, glazes, enamels, clays, and high temperature resistant experimental vessels. Titanium dioxide is an important white pigment and porcelain glaze. Used in paints, inks, plastics, rubber, paper, chemical fiber, watercolor paints and other industries.
The air is filtered and heated into the air distributor at the top of the dryer, and the hot air enters the drying chamber in a spiral shape evenly. The liquid is sprayed into a very fine misty liquid droplet through a high-speed centrifugal atomizer at the top of the tower body, and it can be dried into a finished product in a short time by cocurrent contact with hot air. The finished product is continuously discharged from the bottom of the drying tower and the cyclone, and the exhaust gas is evacuated by the fan.
1. The drying speed is fast, the surface area of the material increases greatly after atomization. In the hot air flow, 95% - 98% of the moisture can be evaporated instantaneously, and the drying time is only a few seconds. It is especially suitable for the drying of heat sensitive materials.
3. The production process is simplified and the operation and control are convenient. For the liquid containing 40-60% moisture (90% of special materials), it can be dried into powder products at one time without crushing and screening after drying, which can reduce the production process and improve the product purity. The particle size, bulk density and moisture of the product can be adjusted by changing the operating conditions in a certain range, so the control and management are very convenient.
JIANGSU JINGYI ENVIRONMENTAL PROTECTION SCIENCE AND TECHNOLOGY CO., LTD. High-tech environmental protection enterprises integrating installation, commissioning and operation have passed ISO 9001, ISO 14001 and OHSAS 18001 International Quality, Environmental Protection and Occupational Health and Safety "Three Standards One"
Barrel Diameter: 1200-4700mm Barrel Length: 25000-72000mm Application: suitable for chemical, mining, metallurgy and other industries large particles, dry than major materials Materials: titanium dioxide, blast furnace slag, light calcium carbonate, phosphate fertilizer, metal powder
Titanium dioxide is considered to be a kind of white pigment with better performance in the world. It is widely used in coating, plastic, paper making, printing ink, chemical fiber, rubber, cosmetics and other industries.Ceramic industry is an important application field of titanium dioxide, ceramic grade of titanium dioxide with high purity, uniform particle size, high refractive index, has excellent resistance to high temperature, our company according to the material properties of titanium dioxide, on the basis of digesting and absorbing foreign advanced equipment and technology, independent research and development of a professional drying equipment - titanium dioxide rotary kiln.
4. Titanium dioxide rotary kiln is a combustion equipment. The pulverized coal is sprayed into the kiln by the kiln head blower, and the heat generated by combustion is transmitted to the material by radiation, convection and conduction.
The kiln head of titanium dioxide rotary kiln is sealed by shell and cover type. Titanium dioxide rotary kiln has the function of heat exchange. The temperature field in titanium dioxide rotary kiln is fairly uniform, which can meet the heat transfer requirements of various stages of cement clinker formation process, especially the requirements of alite mineral formation. Titanium dioxide rotary kiln has reliable combined scale seal at both ends.