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!

900,000 t/a GGBS Plant of Hongyan Building Materials Co., Ltd.

 Overview

Founded in 2011, Tangshan Hongyan Building Materials Company is specialized in producing concrete and GGBS powder, and owns two production lines of production capacity of 600,000 t/a and 300,000 t/a. These two production lines were constructed by Xinxiang Great Wall Machinery Company in turnkey project, the main equipment of which used GRMS46.41 vertical mill and GRMS33.31 vertical mill, the blaine value of GGBFS made from these two production lines can reach 4500cm²/g.

 Configuration

1. Magnetic Separators

Magnetic Separator is an equipment which can make strong magnetic attraction and can remove the ferromagnetic impurities in the material to ensure the transmission system of mechanical equipment such as crusher, grinding machine etc. with safe and regular operation, meanwhile can effectively prevent conveyor belt from crack because of the large and long iron, as well as can remarkably improve grade of material, and it can produce excellent economic benefits for iron recycle.

One of our products, pipeline automatic permanent magnetic iron separator, is an automatic magnetic separation equipment with high-performance, which is widely used in industries, such as cement, electricity, ceramic, brick, chemical industry, food, glass, metallurgy, steel etc., and it is the first choice of iron separator for material purification and ensures the safe operation of subsequent equipment.

2. Dust Collectors

Materials being grind into powder and dried from bottom up through rotating separator. The turning vanes turn dusty gas deflection from upward flow into tangential flow. The rotors of separator are consistent with the rotation of tangential flow. Therefore, centrifugal area is formed in a gap which between turning vanes and moving vanes of separator rotor.

Large particles being throw outward, declined under the action of gravity, when the overlarge particle depart from gap, it will be collected into cutting cone hopper and then fall to millstone for regrinding. Transmitted along with the airflow, the final product enters the dust collector through the rotor and the upper casing of the power concentrator.

3. Center Control System of GGBS Production Line

Center control system of slag powder production line is the important component part of slag powder production line, includes DCS system and industry television system (No.6 monitoring).

DCS system is also called distributed control system, and it is an automatic control system which is controlled by multiple computers to control multiple return circuits respectively in the production process, meanwhile also can centralize obtain data, centralize management and centralize control. Compared with multilevel control system of computer, distributed control system is more flexible in structure, more reasonable in distribution, and lower in cost. DCS system has the features of reliability, openness, flexibility, easy maintenance, coordination and complete function etc.

Industry television system can record the on-site image around the clock on the hard dish drive, and send to control center timely. Related management personnel can see about the current situation of each location, it can dispatch personnel to handle timely according to on-site situation when happens accident, can eliminate latent major accident. It has the functions of multichannel monitoring, video, video retrieval, playback and Camera controls etc.

 Analysis

Tangshan Hongyan Building Material Co., Ltd has a rapid improvement in ggbs production capacity within two years since set up the ggbs production line of 600,000t and 300,000t. GGBFS, which is produced by the company, tested qualified by State Building Materials Test Center, and reaches the S95 level quality standards,meets the requirement of around Bohai bay and domestic coastal city and foreign customers to slag powder with high performance and high quality. Tangshan Hongyan Building Material Co., Ltd achieves good economic benefits with achievements increasing constantly.