DH series dry type press briquette machine

Design Feature

Modular Construction for Customized Flexibility

Briqutting with roller presses follows a simple principle: a fine raw material is fed into the space between two counter-rotating rollers, where it is then compressed and formed into briquettes.

The main functional assemblies provided for this purpose are:

* Press frame

*  Pressing rollers with bearings and bearing housings

* Main drive with reduction gear

* Material feeder: Quantitative screw feeding and forced screw feeding

* Hydraulic pressuring system

* Grease lubrication

* Roller housing

The fixed roller is supported directly in the press frame, while the so-called floating roller is also supported in the frame. The movement of the floating roller constitutes the basic principle of a roller press. The roller are driven by an electric motor in combination with a double-shaft gear box and tooth couplings. This system synchronizes the rollers and allows for the movement of the floating roller.

Controlling the material feed into the roller nip is of paramount importance, whereby a gravity feeder can be used for materials with suficient flow properties. Other materials may require a screw feeder that forces the material into the nip between the rollers.

The pressing drums are designed as round, or oblate or clam segments, and are fitted with pockets of the desired size and shape. FUYI pressing tools are sturdy and wear-resistant, thus ensuring maximum service life and minimum expense. Refurbished pressing tools with a smaller than nominal diameter can also be used.

A roller housing is provided for safety reasons and to minimize dust emission.

Equipment parameters

Process Technology

Briquetting without Binder

Briquetting without binder-typicalrawmaterial
* Aluminum
* Bentonite
*CaOBurnt lime CaO
* Caustic dolomite
* Caustic magnesia MgO
* Clay
* Dimethylterephthalate DMT
* Flue dust
* flyash
* Fluorspar
* Gypsum
* Lateritic iron ore
* MAMaleic anhydride MA
* NaCISalt NaCI
* Sodium cyanide NaCN
* Wood chips

A number of substances can be converted into product of adequate strength without theaddition of a binding agent. The material must of course possess inherent binding properties,whereby the bonding can be achieved in a number of different ways:

Structures(crystalline or non-crystalline) are forced into each other and when thepressure is then reduced, the structures rearrange themselves and form an almost naturalbond. This effect can for example be observed in various salts(NaCI, KCI) or metals.

Binder “on board"

One example is the lignin contained in biomass. Onoressure, the inherent lignin is squeezed out of the originals between the particles.

Mechanical linkage

The particles interlink on account of their shape (e.g.metal turnings).

Capillary forces

Small water bridges from the bond between the particles. This requires a fine particle sizedistribution along with the correct proportion of water. The briquettes are soft and their physicalproperties are not suited to severe handling or transportation situations.

The briquetting process as such is quite simple. Raw material are metered out andhomogenized before being fed to the roller press. FUYl tailors the roller press to the customer'srequirements in terms of the:

* gravity feeder/screw feeder

* roller speed

* press force

* torque of the main drive

* briquette size and shape

* number of roller presses

* etc

The roller press output can be screened so that undersize material is recycled back to theroller press.

Single Roller Press

Multiple Roller Press

Briquetting with Binder

Briquetting with binder-typical mixes

Chrome ore with molasses/hydrated lime

* Coal with bitumen

* Coke fines with starch

* Copper-nickel concentrate withlignosulfonate

* DR/HBI plant residues with bentonite

* DRI fines with molasses/hydrated limeor sodium silicate/hydrated lime

* Feed for RHF-based DR process withstarch

* Molybdenum oxide with ammoniasolution

* Nickel powder with PVA

* Steel plant residues with molasses/hydrated lime

For cold briquetting at feed material temperatures of up to 100°C, it may be necessary to add binders to improve the briquette-forming characteristics.

Binders are primarily used for the briquetting of substances that have inadequateadhesive properties and are thus otherwise unsuitable for the production of firm briquettes,An example is the ubiquitous egg-shaped coal briquette, which has been produced fromcoal fines for well over 100 years, Today, briquettes are usually pillow-shaped, with sizesranging from 1.5 to 60cm', However, depending on the material to be briquetted and thecustomer's specific requirements, other forms and sizes of briquette are possible.

A variety of binding agents is available, but certain criteria need to be met for the rightchoice of binder. Clearly, the binder must function properly and the briquettes need to berobust enough to withstand handling on the way from the roller press to their usagedestination, The subsequent processing also has its specific requirements; for example, abinder that corrodes the lining of a metallurgical vessel will not be suitable, no matter howgood its physical properties may be. And from an economic point of view, the binder mustbe available in sufficient quantities and at an acceptable price per ton of product.

Binders can be classified as:

* glucosidic (e.g.molasses,starch)

* inorganic solutions (e.g.sodium silicate)

* clays(e.g.bentonite)

* thermoplastic (e.g.bitumen,pitch)

*mortar-type(e.g.cement, hydrated lime)

* non-glucosidic organic solutions(e.g.resins)

* fibers(e.g.paper fluff)

The briquetting process must take into consideration the handling of the binderincluding its storage and dosing. Furthermore, a mixer will be required to ensure sufficientpenetration of the binder, and the feed mix needs to be free-flowing in order to avoid theformation of binder nests. Optimizing the distribution of the binder will also have a positiveeffect on operation costs.

DH series dry type press briquette machine

Briquette machine comprises of flowing parts: body frame assembly, roller assembly, hydraulic coupling, speed reduction transmission, complete sets of hydraulic system, automatic control system, dosage screw feeder, forced feeder，automatic lubrication system, bearing temperature detection system, flick gap detection system, etc.

Features

· Dry powder can be directly pressed into balls without any additives.
· The main transmission parts are made of high quality alloy materials.
· Low energy consumption, high efficiency and low failure rate.
· Cyclic operation, continuous production, high pelletizing rate.
· It can control the strength of finished products by adjusting the pressure of rolls.

Applicable materials

Fluorite powder, ceramic clay, iron powder, lime powder, dust removal powder, carbon powder, aluminium powder, ceramic powder, silicon-manganese alloy powder, dolomite powder, alumina powder, manganese ore powder, concentrate powder and other dry powder materials, as well as magnesium oxide, alumina, calcium oxide, laterite nickel ore, desulfurized gypsum, iron oxide scale, sludge, steel slag and so on.

Working principle

Roll press part uses a pair of rollers with a certain gap between them. The two rollers make counter-rotaing at the same speed. One set of the roller axle seats is fixed and the other set slides under the hydraulic pressure. There are a number of arc grooves of the same shape and size aligning regularly on the surface of rollers. Based on different compression ratios, we can adopt the approach of corresponding one roller arc groove to the other(wave trough to wave trough or wave crest to wave crest). The two rollers stay horizontal and parallel. Due to it’s own gravity and the pressure given by the forced feeding machine, powdery materials are consistently and evenly fed into the rollers. As materials are gradually fed into the rollers and rollers are rotating continuously, the space that materials occupy is gradually compressed and the forming pressure reaches its maximum. Pressure gradually reduces afterwards and the compressed granules revert as a result its elasticity and drop from the arc groove because of gravity. Compactor adopts frequency control and its speed depends on the operating conditions of briquette machine and others equipment.