Two Advantages of Great Wall Vertical Mill

After almost a decade cooperation with veteran experts on vertical mill manufacturing and scientific research institutes both in home and abroad, the GRM series vertical mills dedicated to be developed and produced by Xinxiang Great Wall Machinery Co., Ltd, have the characteristics of reliable performance, compact structure, convenient maintenance and outstanding energy saving etc. Here are two more important advantages of Great Wall vertical mill.

　　Wear protection

　　The grinding plant, which is carefully maintained by the owner, provided high availability and trouble-free operation. None of the wear protection plates in the mill housing and in the grit cone of the separator have yet needed replacing. Only the ceramic castable in the upper housing section of the separator was replaced by wear-resistant steel plates soon after the commissioning. Once a year, after approx. 3500 operating hours and production of 300,000t of ground blast furnace slag, the surfaces of the grinding elements are refurbished by build-up welding during a planned maintenance stoppage. The specific wear of grinding track and roller tyres, taken together, is 7.3g/t.

　　For long service life of the grinding tools not only the appropriate wear lining is important. The iron extraction system in the external material circuit is an extremely important feature of the Great Wallvertical roller mill for slag grinding.

　　Iron extraction system

　　It is a well-known fact that iron particles in the granulated blast furnace slag are the main cause of wear in the mill. Therefore it is extremely important to remove the maximum possible amount of this iron. The external material circuit is very well suited for this purpose, because it handles a large quantity of material, some of which is already partly ground.

　　The material passing through the nozzle ring falls onto a discharge ring rotating with the grinding table. This material then passes via a discharge chute into the bucket elevator.

　　The material discharged by the bucket elevator is fed to a vibrating trough, to ensure a uniform feed rate to a magnetic drum separator. The aeration of this magnetic drum separator is so designed that practically pure iron with no granulated slag is removed from the stream of material. After the magnetic drum, the recirculated material finally returns to the grinding table. The incoming granulated blast furnace slag has an iron content of 0.28%, corresponding to an iron quantity of 210kg/h.

　　The recirculating material in the bucket elevator has an iron content of 0.7%. The magnetic drum separator removes around 170kg of iron per hour in permanent operation. The iron contents found in the roller mill and in the finish product impressively illustrate the efficiency of the external material circuit for concentrating the iron and facilitating its removal. Such efficient extraction of iron in the grinding process has a very positive effect on wear in the mill.

　　In the world, many granulated blast furnace slag grinding plants are already in operation, but the number of granulated blast furnace slag grinding plants is still low. Customers from all over the world who are now interested in slag grinding are invited to send their inquiries to the Great Wall Machinery. Any of your inquiries will get prompt attention.

The composition and characteristics of Great Wall Cement Production Line

Cement Production Line mainly contains material crushing, homogenizing, preheating decomposition, calcined cement clinker, cement grinding, finished product packing and so on, the composition of Cement Production Line mainly contains Rotary Kiln，Cement Mill, Cyclone Preheater, Cooler and so on. On Cement Production Line, the correct Cement Mill selection and the reasonable technological process are important guarantee on the cement production line.

　　On the Cement Production Line, Rotary Kiln is very important, the composition of Rotary Kiln mainly contains Roller kiln head, activities, support equipment, transmission equipment, sealing device, burning device and so on. Great Wall Rotary Kiln has simple operation, reasonable structure, smooth operation, easy handling during production process, so it's your best choice.

　　In addition, on the Cement Production Line, cement grinding is also an important step, and it is also the end process of production line. Its main function is to cement clinker grinding to a suitable fineness, developing a certain grain size distribution, in order to accelerate the hydration speed and satisfy the requirement of hardening. In this step, You can choose the appropriate vertical cement mill and ball mill according to their own needs. Great Wall is engaged in cement grinding research and production for 60 years, No matter from the design and use, it can make the customers get the maximum energy saving and time saving.

　　At last, I want to tell you, the Great Wall machinery factory has a service concept which is customer satisfaction for years. The cement plant provides a very wonderful cement production line for the general customers, which has high degree of automation, environmental protection, large industrial waste utilization and high production efficiency. Welcome to our Great Wall!

Magnesium Oxide rotary kiln / Dolomite kiln / Magnesite kiln / Titanium dioxide rotary kiln

Raw material:Magnesite, dolomite

　　Product introduction:

　　The dolomite calcined by Great wall machinery magnesium oxide rotary kiln are well selected for most of the magnesium oxide plants, with a number of advantages such as high capacity, high degree of mechanization, easy maintenance, high activity, low burning loss, high ratio of magnesium extraction and silicon utilization.

　　Performance features:

　　(1)By using 3D design and simulation, the design and structure of main parts are optimized so as to reasonable and safe working status.

　　(2)Top grade raw material and processing technology leads stable and reliable running.

　　(3)Easy, flexible and reliable operating.

　　Working principle：

　　A whole set of magnesium oxide rotary kiln involves rotating cylinder, supporting device, belt pulley kiln head, tail sealing device, coal spraying pipe devices and so on. The kiln body installs in a certain angle with sea level, supported by roller, and also gear wheels controlling the up and down movement of kiln body. For the transmission part, besides the main drive, the auxiliary drive devices, which can continuously ensue running and avoid deforming, are included in case of main power supply interrupt. The clam shell seal on kiln head and axial contact sealing device on kiln tail ensure the sealing reliability for the whole machine.

Nickel Iron Rotary Kiln/ Nickel Ore Rotary Kiln

-Introduction of Laterite Nickel Ore

Laterite nickel ore resource is formed from nickel sulfide ore rock, after weathering, leaching, sedimentary into surface weathering crust deposit, and found in tropical countries within 30 degrees north and south of the equator line in the world, mainly concentrated in tropical, subtropical areas of the Pacific rim, mainly including: Cuba, Brazil of America, Indonesia and the Philippines of Southeast Asia, new caledonia, Papua New Guinea of Oceania Australia, etc.

-Second, Structure of Laterite Nickel Ore Rotary Kiln 

Nickel ore rotary kilns consist of cylinder, rotating device, supporting device, kiln liner, kiln inlet, kiln seal and fuel device, etc. Kiln cylinder is heated rotating part, adopting winded welding of high quality carbon steel plate. The cylinder is supported by the tyre with different shifts equipped with mechanical or hydraulic type, so as to control the axial rotation of cylinder. Driving devices work through gear in the middle part so as to control speed of cylinder according to technological requirements. Due to need of installation and maintenance, large nickel rotary kiln body will rotate at very low speed. To prevent cold air into the dust and dust overflows from cylinder, the reliable seal devices of kiln inlet and outlet will be equipped.  

-Three, Strengths of Rotary Kiln for Laterite Nickel Ore Structure

(1) The main energy is coal, [1] rather than expensive coke or electricity.

(2) Free choice of raw material, various laterite nickel ores available in Southeast Asia.

(3)High quality nickel and iron (including about Ni 20 %), can be directly used for the production of stainless steel. 

(4)Meanwhile it can be used as a coolant when melting steel.

-Four, Smelting Method and Process of Laterite Nickel Ore Rotary Kiln 

Preprocessing step is to mix the ground laterite nickel ore with carbon materials and flux limestone straightly, then feed them into the rotary kiln continously. The burnt material from rotary kiln will be for water treatment. The gravity concentration and magnetic separation will recover nickel and iron from the discharge. The nickel and iron separated is 2~3 mm in diameter like sand particles, and 1 ~ 2% slag entrainment with chemical composition is C0.1 %, Ni18 ~ 22%, S0.45 %, P0.015 %. 

Saving and efficient equipment for cement industry

The cost of energy as part of the total production costs in the cement industry is significant, warranting attention for energy efficiency to improve the bottom line.Substantial potential for energy efficiency improvement exists in the cement industry. A portion of this potential will be achieved as part of (natural) modernization and expansion of existing facilities, as well as construction of new plants in particular regions. Still, a relatively large potential for improved energy management practices exists.

　　Great Wall Machinery can provide energy saving and efficient cement production equipment .

　  Cement production equipment for vertical roller mill

　　The vertical roller mill has been widely used and promoted in the electric power, metallurgy, chemical industry, non-metal industry because the overall efficiency attributed to energy-saving and low consumption is becoming more and more evident in the cement industry.

　　Advantage of Great Wall vertical roller mill

　　1.High grinding efficiency and lower energy consumption

　　2.Lower metal consumption per unit of product

　　3.Grinding on the material layer bed, minimal sound emission

　　4.Operation under negative pressure and minimal dust pollution

　　5.Simple process flow with the combination of grinding, drying and classifying in a single unit

　　6. Less land occupation, tight layout, light weight, lower civil works cost

　Cement production equipment for ball mill

　　Ball mill is widely used in mineral dressing, building materials, chemical industry and other industries, for grinding medium hardness ore and other materials; its divided to dry-type and wet-type according the difference for grind types; according the difference of ore discharges, its divided to grid-type and overflow-type; according the difference of grind materials, its divided to ball mill and rod mill.

　　Advantage of Great Wall ball mill

　　1.The double slipper ball mill of Great Wall Machinery. It is the first product solving the problem that the temperature is too high to continue running. It won the national utility model patent. The patent number is ZL201020285841.9. Many examples has proved that, this equipment can run steady for a long term.

　　2. The main parts like hollow shaft, gear wheel and so on, all of them are individual produced by the casting factory of Great Wall Machinery. It takes the short production with high efficiency.

　　3. Our strength ability of machining can ensure the equipment quality and delivery 

     Cement production equipment for rotary kiln

　　Great Wall can produce rotary kiln , which is widely used in metallurgy, steel, chemical, refractory, ceramsite, papermaking industries. The kiln supporting has rolling and sliding type and the drive can use DC or AC variable frequency control. It has various seal types for different working condition . Great Wall can also design and customize non-standard rotary kiln according to customer’s special requirements

　　Advantage of Great Wall rotary kiln

　　1. Supporting Device: it adopts advanced main shaft structure, automatic temperature measuring device and electrical heating device. And it has optional flow support.

　　2. Thrust roller: It has mechanical type and hydraulic type. The hydraulic thrust roller is equipped with advanced hydraulic controlling system.

　　3. Drive device: It has single drive or double drive. The adjustable-speed motor, DC motor or frequency variable motor control kiln rotation speed. And has features of reliable running and high efficiency.

　　4. Tyre shim: The shim under tyre has fixed type and adjustable type. The adjustable shim has features of simple structure, easy replacement and maintenance without any damage to shell.

　　5. Sealing device: Various types of sealing device are available for different kiln, such as cylinder tighten sealing, spring tighten sealing, graphite block sealing, spring graphite, fish scale type seal etc, which has good sealing effect.

　　6 Kiln head hood: It has fixed type and flexible type.

Dry and wet process cement clinker grinding plant

1. Production process of cement

　　A cement clinker grinding plant consists of the following three processes.

　　(1). Raw material process

　　(2). Clinker burning process

　　(3). Finish grinding process

　　The raw material process and the clinker burning process are each classified into the wet process and the dry process.The raw material process and the clinker burning process are each classified into the wet process.In the dry process, crushed raw materials are dried in a cylindrical rotary drier having a diameter of 2 m and a length of about 20 m for example, mixed by an automatic weigher, ground and placedin storage tanks. The resultant mixture is further mixed to make the ingredients uniform, and sentto a rotary kiln for clinker burning.

　　PIC1.Cement production process

　　2.Raw material process

　　(1).Wet process

　　Since raw materials can be homogenized and the mixing ratio can be corrected after grinding, this process is relatively simple.

　　PIC2.Wet process raw material grinding system

　　(2).Dry process

　　PIC3 shows three processes a, b and c. Raw materials received by a plant contain a small amount of water. Limestone contains 2 to 5% of water and clay about 5 to 10%. The dry process needs to evaporate water when grinding. In PIC3, process a is provided with an independent dryer to evaporate water, and the dryer may be a rapid dryer or impact dryer with a disintegrating or crushing function instead of the rotary dryer as illustrated. - 4 - In PIC3, process b is a closed circuit grinding process combining an air separator and a ball mill or tube mill, which is provided with drying function. The above mill and separator are available in several types. In PIC3, process c is an example of vertical roller mill. For drying, exhaust gas from the kiln and preheater is used, but sometimes a hot gas generator is installed for a time of commissioning of the plant and for a time of year when water contained in raw materials increases.

　　PIC3.Wet process raw material grinding system

　　As A leading Cement Plants Manufacturer Great Wall MachineryCo.,LTD offer all type of quality Turnkey Cement Plants, setup machineries, cement clinker grinding plant equipments, heavy industries setup and fertilizer plants. besides cement plants,we also known for industrial gears supplier and equipments manufacturerslike vertical mill, ball mills, rotary kilns, belt conveyors and other material handling equipments for cement plants equipments ect.

　　Our Satisfied Customer Return Ratio with the support of our skilled cement clinker grinding plant expert we are successfully installing cement plants in India, Middle Asia ,South America and South African countries. With All latest cement plant equipments and material handling equipment and machines we are capable to manufacture up to 200TPD-5000 TPD cement plants.The Great Wall machinery are looking forward to your coming !

Professional manufacturer of Rotary dryer

The rotary dryer is a type of industrial dryer employed to reduce or minimize the liquid moisture content of the material it is handling by bringing it into direct contact with a heated gas.It is widely used for drying the chalk slags, coal powder, slags, clay and other materials in the building materials, metallurgy, chemical industry, cement industry. The rotary dryer has a better adaptability and can dry various materials with a simple and reliable operation.

　　Working principle

　　The auto-combustion device provides heat resource for our Industrial drier, which adopts down-flow heating method. When the mineral materials are fed into the cylinder, it flows down as a result of gravity. Meanwhile, they are repetitively scattered in the air so that they are in full contact with the hot air. The material is dried gradually

　　Advantage of rotary dryer

　　The dryer has advantages of reasonable structure, high efficiency, low energy consumption and convenient transportation.

　　Performance Characteristics of Rotary Dryer:This series drier is used for drying materials with humidity or granularity in

　　the industries of mineral dressing, building material, metallurgy and chemical. Rotating dryer can be used for drying many kinds of materials and with convenient and reliable operation; therefore, it has been widely used.

       Great Wall not only is professional cement equipment manufacture , we also can provide high quality rotary dryer , if you need rotary dryer , please contact with me.