Henan Zhengzhou Mining Machinery Co., Ltd began to manufacture equipments for Mg smelting industry from 1988, and focused on the technology upgrading and utilization. During 2003-2005, the company invented Vertical pre-heater for the calcination of dolomite. This kind of new pre-heater saves fuel by 40% and increases the output by 30%. The exhaust gas is recycled and dust emission can be controlled under 50mg/m3. This kind of new pre-heater takes up more than 85% in the market share. The company has got the patent of energy-saving rotary kiln, vertical pre-heater and vertical cooler.
Our advantages:
1. Saving energy: The refractory lining of the rotary kiln consists of the outer insulation made of light refractory brick and inner compound refractory bricks. Such kind of lining will reduce the heat emission on the shell surface of the rotary kiln as much as possible. The pre-heater at the end of the rotary kiln will recycle the heat to preheat the material and save fuel by 40% and increase the output by 30%.
2.Low consumption: The vertical cooler at the discharge end of rotary kiln recycles the heat of the calcined dolomite which is discharged from the rotary kiln, and will preheat the secondary air up to 600. The vertical cooler is integrated with kiln hood to prevent the waste caused by heat emission from the discharged calcined dolomite.
3. Two phases of dust collection including cyclone filter and bag filter, will control the dust emission below the limitation of the national standard.
4. High degree of automation:PLC control system improve the job efficiency
Production Technology:
Pidgeon process is applied in the company Mg smelting technology. This kind of process is advanced and reliable technology.
Qualified dolomite is transported into the rotary kiln for calcination; Calcined dolomite is mixed with fluorite and ferrosilicon and then pressed into briquette. The briquette is put into retorts where there is vacuum, and then deoxidized into crystallized Magnesium, which is called crude Mg. Crude Mg is smelted and refined to get pure Mg. The complete production line is divided into several systems including raw material storage, dolomite calcination, grinding&briquetting, reduction and refining.
Magnesium metal production line We are the leading company of magnesium production lines both at home and abroad, in the year 2011, we have signed an annual output of 100000 tons of magnesium metal project with the world iron and steel giant Korean Pohang iron POSCO company. Magnesium Calcination Process The company's magnesium production line is very famous, at present, many famous enterprises at home and abroad have chosen to cooperate with our company. Step1: Calcined--The calcined dolomite granular A. Process introduction: As a result of mining dolomite is too large in volume, So crushing and calcining bulk dolomite, make its become particles. B. Main Product: Jaw Crusher, Conveyor, Vibrating screen, Vertical preheater, Rotary kiln, Vertical cooler, etc. Step2: Grinding and balling--Raw material production and storage A. Process introduction: Calcined dolomite, using a ball mill and other equipment to the grinding ball material, storage after production well. B. The main equipment: Electronic batching scale, Bucket elevator, Ball mill, Screw conveyer, FU chain conveyor, etc. Step3: Reduction treatment -Reduction treatment raw materials A. Process introduction: Refine the raw materials, product the qualified products and sales. B. List of equipment and processes: Reduction furnace, Wind machine Vacuum pump, Jet pump, etc. Step4: Refine--produce a product A. Process introduction: Use of a series of equipment, refine the raw material, create quality products and sales them. B. The main equipments: Refining furnace, Electronic moisture device, Pouring pump, Continuous casting machine, etc.
Rotary Kiln For Calcined Magnesium Production Line Rotary kiln is composed of cylinder, gears, support device, kiln liner and kiln tail sealing equipment, kiln head hood and combustion. Cylinder as heated pivoting part, made of high-quality carbon steel plate, is supported on the support device by tyre, and there is machanical or hydraulic pressure catch wheel on the first or some gear in order to control the turning of cylinder. Gearing gyrate according to process-required rotating speed by ring gear in the middle of cylinder. Because of the need of installation or maintenance, the bigger rotary kiln has auxiliary gears, which makes cylinder gyrate more slowly. To prevent cold air come in and dust overflow, the reliable kiln tail and head sealing equipment is installed on feed and discharge end. Product application: Rotary kiln is Thermal Equipment, heating materials, it is widely used in the fields of cement, Nonferrous Metallurgy, ferrous metallurgy, refractory material, chemical materials, paper making. Product feature: 1. Support device: Advanced shaft structure, automatic temperature measuring device and electrical heating, . 2. Catch wheel: Including two kinds mechanical wheel and hydraulic pressure 3. Gears: Single or double. Control the rotating speed by buncher, DE machine and frequency variable motor. Be reliable, energy-saving, and efficient. 4. Cylinder tyre bolster: Lower bolster has three types: Fixed, zoom and floating. The structure is simple, replacement is convenient and wont hurt cylinder. 5. Sealing equipment: There are many kinds for choice according to kiln models, including air cylinder edge sealing, spring edge sealing, graphite block sealing and combination for above. The feather is adaptive for cylinder rotating and swing. And sealing effect is very good. 6. Kiln head hood: Including stationary type and flexible type.
High performance magnesium production line 1. Iso9001: 14000 2. Lifetime service 3. Market share: 90% 1. Production capacity We can provide complete set technology solutions and supporting production equipments of magnesium production line. 1). Design capacity of single production line: 5000-25000 tons per year 2). According to client's special requirements to design. 3). We have professional process design engineers, equipment engineers, electrical engineers, etc. 4). We have more than 50 years' experiences of production design, and the market share is over 90%. 2. Main equipments: Rotary kiln, ball mill belt conveyor, vertical preheater, vertical cooler, vibrating feeder, screw conveyor, bucket elevator, bag type dust, etc. 3. Technical stepls 1) calcine dolomite: heat the dolomite to 1100~1200 temperature in the rotary kiln, then the dolomite changed into mgocao. 2) dosing ball: calculating. Dosing and grinding the mgocao...Ferrosilicon and flousper power, then press into ball. 3) reduction: heating the ball to 1200+10 tem in the reduction pot, keeping 8-10hour under the situation of 13.3pa or empty space. The mgo was reduct as magnesium vapour, then cooled into rough magnesium. 4) refining magnesium ingot.: heating the rough magnesium, and under the situation of 710 tempurature, made it into magnesium ingot, that is pure magnesium. 5) scouring: acid magnesium ingots, will with sulfuric acid, nitric acid cleaning surface or removed from the surface, make the surface appearance
Supplier: Building materials like gypsum products (row & calcined), gypsum fertilizers, calcium carbonate coated and uncoated, calcined dolomite, magnesium oxide, gypsum products (in line and calcined), coated and uncoated calcium carbonate, plaster products (ordered and calcined), plaster based fertilizer
Supplier: Plasterboard line, gesso line, gesso block production line, PVC plasterboard, cement equipment, aerated concrete equipment, mineral wool board production line, line, glass fiber and magnesium slag cotton production line, XPS foamed sheet line
Gypsum powder equipment is composed of elevating system, dust collecting system, conveyor system, heat supply system, milling system etc.. And the heat supply system is the key link of the whole gypsum powder production line. The gypsum produced by our company has the following characteristics: 1.The equipment has small volume but large yield. 2.The equipment with easy structure can not be damaged easily. 3.The compact equipment covers less area. 4.It has comparative less energy consumption. 5.It can be conveniently operated and easily controlled. 6.The products are of good quality and gypsum of Paris is of ideal components and stable physical properties. 7.The capital construction investment is small and operating expense is low. Container.
Magnesium rotary kiln is designed according to dolomite calcination characters and Pidgeon process requirement. That is the key equipment in the calciantion process. The dolomite produced by rotary kiln with stable quality, high activity and low ignition loss that can make higher magnesium extraction rate and silicon utilization rate to save running cost. The rotary kiln is the most suitable equipment for produce magnesium. The new type energy-saving rotary kiln designed by ZK Corp. has own patent and formed dolomite calcination standard for magnesium industry in China. Our products advantages: 1. According to the character of dolomite and its calcination requirement, the structure of kiln inlet and outlet sections has been optimized. It can resolve the problem of material returning back to kiln inlet and the leakage of dust. 2.Inner of the kiln keeps micro negative pressure, dust pollution is lower. 3.Rotary kiln is even calcination, large capacity and easy to operation and maintenance. Magnesium rotary kiln is mainly compose of driving device, supporting roller, catching roller, cylinder, kiln inlet, kiln outlet and sealing device. 1. 2-3 supporting points can guarantee the contacting surface between supporting roller and tyre is paralleled with axis line of cylinder during installation. 2. Supporting device is antifriction bearing (occasionally uses slide bearing). This design has simplified the supporting device of supporting roller, and reduced the useless power loss during operation. It has the features like easy operation and maintenance. 3. Low speed unloading rotation device is designed for easy installation and commissioning. It also can guarantee unloading rotation operation during maintenance of main driving system or other emergency situation. This design can prevent cylinder from bending and deforming during the temperature is cooling down. 4. Mechanical or hydraulic catching roller is optional according to different type of rotary kiln. Both them have high accuracy and reliability, and also make sure evenly attrition of outer circle of supporting roller and tyre at the direction of complete width. 5. Radial direction contacting type sealing device is adopted at kiln inlet and outlet. They are perfect suitable for dimension tolerance of cylinder and skewing movement of cylinder. This sealing device’s feature is good performance, longer working life and easy for replacement
Gs series drum sieve is used at the dolomite stockyard in magnesium plant. It will remove small-size dolomite before the dolomite come into rotary kiln. Gs series drum sieve could be widely used to separate dry powder and grains or wet grains for the business of metallurgy, building material, chemical industry, material grinding. Gs series drum sieve could be used for separating dolomite in magnesium industry and outputting balls from ball press. It could also be used for: 1. Separating different-size stone in quarry; and also soil and rock flour. 2. Separating sandstone in steinbruch. 3. In coal industry, it is used to separate lump coal and powder coal and for coal washing(one part of coal washing line) 4. In chemical and benefication industry, it is used to separate different-size block and powder. Features and benefits of gs series drum sieve 1. Screening hole is very hard to be jammed. 2. Stable running and low noise 3. Simple structure and convenient maintance. 4. Screening tube could be sealed up which is easy for dust-collector. 5. High reliable equipment and low investment. 6. Tacking special screening mesh, high efficiency and long working life. 7. Slight pollution due to sealing up and good for environment. The working principle of drum sieveï Drum sieve is installed on the rack slantly. Through speed-reducer, motor is connected together with drum by coupler which drive the drum device go around its axle. After the material comes into the drum, the material on the screen mesh will turn over and roll with the rolling and inclined drum and then the qualified material(undersize product) will come our through the screening hole, however, the unqualified material(oversize product) will be discharged out through the drum end. The material stuck in the screening hole could be taken out due to the material rolling and turning over in the drum to avoid blocking. The working principle of cylinder sand siftering machine and drum sieve extension is almost same, just with different name.
