Briquetting

Briquetting is the process of increasing the particle size of a material in a dry way, in which dust and powders take shape and a granular structure. Product compaction is achieved by mechanical compression through a double roll press.

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Fields of application
  • Chemicals (sodium sulphate, sodium chloride, carbonates, sodium cyanide, potassium cyanide, iron sulphate, potassium bromide, boric acid, urea)
  • Minerals (alumina, bauxite, lime, dolomite, gypsum, china clay, magnesia, fluorspar, paint pigments, Sulphur)
  • Gypsum from power station flue gas desulphurization
  • Minerals (chromium, cobalt, copper, iron, manganese, lead, zinc)
  • Metallic oxides (Waelz oxides), rare earth oxides, zirconium hydroxide, ferro-alloys, molybdenum trioxide, zircon sand
  • Steel turnings
  • Coal : production of briquettes for home or industrial heating (partial coke oven charge, briquettes treated to obtain formcoke, briquettes for gasification)
  • Coal for production of activated carbon
  • Lignite, peat, etc.
  • Charcoal
  • By-products from steel mills and metallurgy
  • Graphite, carbon black
  • Phosphate (hot or cold briquetting)
  • Clay
  • Detergents
  • Frozen food
  • Sugar
  • Glass batch
  • Steelworks waste materials and by-products (sludge, mill dust, sintering fines, mill scale, coke fines)
  • Dried sewage sludge
Process

The briquetting units shape fine materials into larger forms of varied shapes, sizes and volumes (from a few cc up to 600 cc and more): these characteristics are defined according to the product end use.

If the cohesive forces (particulate cohesion, valence forces, recrystallization, van Der Waals forces) between the particles are low, a binder has to be used before agglomeration. The physical properties of the feed material, the end use of the briquettes and the cost of binder addition have to be taken into account before a selection is made. A large variety of (liquid or solid) binders is offered: starch, bentonite, bitumen, lime, cement, water, flour, lignosulphonates, molasses, polymer, resin, sodium silicate, etc.

The briquettes are obtained at a low or high pressure and can undergo mechanical or thermal treatment according to the characteristics of the processed material, the binder used and the desired final product. 

According to the material, the main stages of the process саn bе as follows

• Product preparation unit (screen-crushing, drying, sieving)

• Dosing and mixing of product with binder

• Briquetting unit

• Post treatment of the briquettes (air or oven drying, curing, polymerization, aging)

The capacity of а briquetting line can range fгоm 50 kg/h to 100 Т/h and for products with а temperature range between -40°С аnd + 1000°C.

Integrated system

SAHUT-CONREUR provides compact and complete turnkey systems (including electrical interlocking and interfacing control) integrating others around the briquetting press. These briquetting units are built to meet specific needs.

Briquetting press

The press is composed of two rolls: оnе is fixed in the press frame (fixed roll) whereas the other roll сап move perpendicular to its axis (mobile roll). The size of а press is characterized аmong other features by the roll diameter (from 250 mm to 1400 mm) and the roll width (from 40 mm to 1600 mm).

The tangential speed of the rolls determines the compression time which has а noticeable influence оп the quality of the densified product. The roll speed саn go up to 25 Rpm and even higher in particular cases; it corresponds to а tangential roll speed up to 1 meter per second.

Hot briquetting iron

SAHUT-CONREUR has developed a range of equipment specifically adapted to sponge iron briquetting obtained by direct reduction of iron ore

SAHUT-CONREUR has developed a range of equipment specifically adapted to sponge iron briquetting obtained by direct reduction of iron ore (DRI).

This technique which consists in reducing the iron oxide that is removing oxygen is commonly used by the steel manufacturing industry to obtain iron. Due to this deoxidation, the DRI shows a very porous structure, hence its name of sponge iron and tends to reoxidize very quickly. The handling and transport of raw DRI is very uneasy because of the risk of autoignition caused by reoxidation.

The hot briquetting process of DRI aims at eliminating this risk of autoignition by reducing the porosity and consequently the surface in contact with the air that would be likely to react with the moisture contained in the air. It consists in transforming the particles of DRI into briquettes (HBI) of a volume of about 100 cm3.

The DRI particles are compacted directly at the outlet of the reduction process by means of a double roll press.

This press is equipped with a force-feeder with one or two conical screws; this feeding system enables to feed the DRI through the rolls and transform the particles into briquettes when running through the pocketed rolls.

At the press outlet, the strings of briquettes are conveyed towards a separator, made up mainly of a rotor fitted with impact bars dividing the chain of briquettes into separate briquettes.

The press and the separator are the key-equipment of a sponge iron hot briquetting plant. The removal and recycling of the fines generated during briquetting back to the press by means of a screen and elevator is a possibility.

The hot briquetting process is a reliable and recognized sponge iron passivation technique that enables to obtain a secure product, allowing easy handling, storage and transport.

Cold briquetting iron and carbon

Cold Briquetted Iron and Carbon (CBIC) is an innovative product in direct reduction family which was introduced to iron and steel industry in the past few years.

Cold Briquetted Iron and Carbon (CBIC) is an innovative product in direct reduction family which was introduced to iron and steel industry in the past few years.


CBIC is the compacted form of Cold Direct Reduced Iron (CDRI) which is produced in direct reduction process. Since Iran is the largest producer of gas-based CDRI in the world, CBIC - as the best solution for CDRI passivation - was developed by an Iranian company named by Tadbir Sanat Asia (TSA).

CBIC is a patented product which is filed and granted in Iran Intellectual Property Office in 2014. The assignee of this patent is TSA (SAHUT CONREUR's exclusive representative in the Middle East) and SAHUT CONREUR designs and manufactures the CBIC plants.

CBIC has some advantages over CDRI which include higher density, higher oxidation resistance, lower water absorption and higher capability of carbon content. These advantages not only make its storage and shipment easier and more economic but also, have significant effects on steel-making process.
Experiments have shown that replacing CDRI with CBIC in charging regime of steel-making process (up to 50%) reduces dust generation, energy consumption and tap-to-tap time and improve the productivity of steel-making plant.

Furthermore, another benefit of CBIC compared with other products of DRI family is its adjustable carbon content according to the steel-making plant requirement. In other word, this product provides an innovative solution for high- efficiency carbon addition into steel-making furnaces.

At present, this technology has reached a stage of maturity that the first CBIC industrial-scale plant has been commissioned in Iran in early 2018 and is in operation now. It is worth to mention that all predictions about technical parameters and feasibility of this plant have come true.

Approving CBIC technology in industrial scale and having a wonderful trade opportunity in the international market of iron-bearing materials have drawn attention to this technology and the demand for CBIC is increasingly rising.
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More about other process

Dry process for converting powder into granules of various shapes and sizes.

Special Roller Press specifically adapted for grinding can crush materials of variable size range