Turnkey Project Solution

Ball Mill is an efficient tool for grinding many materials into fine powder. The Ball Mill is used to grind many kinds of mine and other materials, or to select the mine. It is widely used in  Cement plant, building material, chemical industry, etc. There are two ways of grinding: the dry way and the wet way. It can be divided into tabular type and flowing type according to different expelling mine. To use the Ball Mill, the material to be ground is loaded into the Neoprene barrel that contains grinding media. As the barrel rotates, the material is crushed between the individual pieces of grinding media that mix and crush the product into fine powder over a period of several hours.

Quite simply, the longer the Ball Mill runs, the finer the powder will be. Ultimate particle size depends entirely on how hard the material you're grinding is, and the time how long the Ball Mill runs. Our Ball Mills have been used to grind glass, powder food products, create custom varnishes, make ceramic glaze, powder various chemicals, and make Black Powder
Features:

• High energy saving capacity
• Low maintenance
• Long service life

A multi-stage cement calcining plant suspension preheater having a plurality of stages each of which has a separator for separating raw cement meal from gas in which the meal is suspended and wherein said separators of said plurality of stages are serially connected and in series with a calcining combustor, characterized in that the separators in certain of said stages are helical duct inertial separators each of which comprises a hollow elongated continuous duct having its longitudinal axis disposed generally along a downwardly inclined helical path with its inlet end at a higher elevation than its outlet end, said duct having adjacent said inlet end a gas inlet opening in a vertical plane for receiving a generally horizontal gas stream with cement meal suspended therein, means including a downwardly inclined upper wall and a concave outer side wall for deflecting said horizontal stream into a downwardly inclined helical path within said duct, a generally horizontal bottom wall in the path of the helically downward directed gas stream, a meal exit opening in said bottom wall adjacent said outlet end, and a gas exhaust opening in the top wall adjacent said outlet end, whereby said helically downward directed gas stream impinges upon said bottom wall and is deflected upward toward said gas exhaust opening while the heavier meal is urged by centrifugal and inertial forces to precipitate from said gas stream and flow along said bottom wall toward said meal exit opening.

A suspension preheater in accordance with claim 1 wherein the separator of the uppermost stage is a cyclone separator and each of the remaining stages includes one of said helical duct inertial separators.
A suspension preheater in accordance with claims 1 or 2 further characterized in that said calcining combustor has a combustion gas and calcined cement outlet connected to said gas inlet opening of the helical duct separator of the lowermost stage and also has a preheated cement meal inlet connected by a meal feed pipe to said meal exit opening of the helical duct separator of the stage immediately above said lowermost stage.
A suspension preheater in accordance with claim 3 further characterized in that each of said plurality of stages except said lowermost stage includes a heat exchanger elbow conduit of generally inverted-L configuration which communicates at its upper end with the gas inlet opening of said separator and is contoured to direct the gas rising therein into a horizontal stream and which also communicates at its lower end with the gas exhaust opening of the separator of the stage below it and also includes a meal exit pipe which communicates at its upper end with the meal exit opening of the separator of the stage above it and communicates at its lower end with said heat exchanger conduit, and wherein said heat exchanger conduit of said uppermost stage has a meal feed inlet for introducing raw cement meal into said preheater.

A Rotary kiln is a pyroprocessing device used to raise materials to a high temperature (calcination) in a continuous process. Materials produced using rotary kilns include:

•      Cement
•      Lime
•      Refractories
•      Metakaolin
•      Titanium dioxide
•      Alumina
•      Vermiculite
•      Iron ore pellets

They are also used for roasting a wide variety of sulfide ores prior to metal extraction. The kiln is a cylindrical vessel, inclined slightly to the horizontal, which is rotated slowly about its axis. The material to be processed is fed into the upper end of the cylinder. As the kiln rotates, material gradually moves down towards the lower end, and may undergo a certain amount of stirring and mixing. Hot gases pass along the kiln, sometimes in the same direction as the process material (co-current), but usually in the opposite direction (counter-current). The hot gases may be generated in an external furnace, or may be generated by a flame inside the kiln. Such a flame is projected from a burner-pipe (or "firing pipe") which acts like a large bunsen burner. The fuel for this may be gas, oil or pulverized coal.

High efficiency reciprocating grate cooler and control flow grate coolers developed by us has been successfully used in the cement production lines ranging from 300 tpd to 6000 tp day. grate cooler is reliable in adapting to the clinker, throughput fluctuations and adverse working conditions
The high resistance new type control flow trough grates are used with good airflow permeability and cooling features which can effectively remove “red river”
The temperature of the secondary and tertiary air is high, with heat recovery efficiency of the cooler over 70%~75%
-The grates are specially heat treated with low loss
-The specific air consumption is less than 2Nm3/kg clinker
-The new type of air girder supply structure with good air tightness and air flow features is used, eliminating the air leaking and scurrying at the hot end grate bed air chamber and uneven clinker cooling.

Kiln Tires and supporting rollers , close up showing typical chair arrangement Tires, sometimes called riding rings, usually consist of a single annular steel casting, machined to a smooth cylindrical surface, which attach loosely to the kiln shell through a variety of "chair" arrangements. These require some ingenuity of design, since the tyre must fit the shell snugly, but also allow thermal movement. The tyre rides on pairs of steel rollers, also machined to a smooth cylindrical surface and set about half a kiln-diameter apart. The rollers must support the kiln, and allow rotation that is as nearly frictionless as possible. A well-engineered kiln, when the power is cut off, will swing pendulum-like many times before coming to rest. The mass of a typical 6 x 60 m kiln, including refractories and feed, is around 1100 tonnes and would be carried on three tires and sets of rollers, spaced along the length of the kiln. The longest kilns may have 8 sets of rollers, while very short kilns may have only two. Kilns usually rotate at 0.5 to 2 rpm, but sometimes as fast as 5 rpm. The Kilns of most modern cement plants are running at 4 to 5 rpm. The bearings of the rollers must be capable of withstanding the large static and live loads involved, and must be carefully protected from the heat of the kiln and the ingress of dust. In addition to support rollers, there are usually upper and lower "retaining (or thrust) rollers" bearing against the side of tires, that prevent the kiln from slipping off the support rollers.

Drive Gear

The kiln is usually turned by means of a single Girth Gear surrounding a cooler part of the kiln tube, but sometimes it is turned by driven rollers. The gear is connected through a gear train to a variable-speed electric motor. This must have high starting torque in order to start the kiln with a large eccentric load. A 6 x 60 m kiln requires around 800 kW to turn at 3 rpm. The speed of material flow through the kiln is proportional to rotation speed, and so a variable speed drive is needed in order to control this. When driving through rollers, hydraulic drives may be used. These have the advantage of developing extremely high torque. In many processes, it is dangerous to allow a hot kiln to stand still if the drive power fails. Temperature differences between the top and bottom of the kiln may cause the kiln to warp, and refractory is damaged. It is therefore normal to provide an auxiliary drive for use during power cuts. This may be a small electric motor with an independent power supply, or a diesel engine. This turns the kiln very slowly, but enough to prevent damage.

We are involved in offering the turnkey project solution for the rotary klin cooler that is an equipment widely used in various sugar, cement and paper plants. Fabricated using superior quality raw material, the precision engineered equipment is easy to install and maintain and deliver high performance with long service life. The quality controllers conducts stringent quality tests on designing, manufacturing, commissioning and installing of rotary klin cooler on the parameters of hardness testing, chemical testing, physical testing, hardness testing and non-destructive testing. We also provide customized solutions as per the requirements of client.