dri/sponge iron

dri/sponge iron

DRI (direct reduced iron) or another name as sponge iron, is a kind of mid product in the steel making process. Itgained great prominence as a substitute for the metal scrap (steel) in the furnace. The briquettemachine for DRI normally has two types hydraulic type and hydraulic roller type. For customer who wants to []

sponge iron (dri, hbi) briquette making and the briquetting machine

sponge iron (dri, hbi) briquette making and the briquetting machine

Sponge iron, also name as direct reduced iron (DRI), is the resulting product (with a metallization degree greater than 82 percent) of solid state reduction of iron ores or agglomerates (generally of high grade), the principal constituents of which are Metallic iron, residual iron oxides carbon and impurities such as phosphorus, sulphur and gangue (principally silica and alumina).

Sponge iron/DRI has gained great prominence in some countries as a substitute of steel scrap (partially) in steel making in electric arc furnace and in induction furnace. Direct Reduction is a metallurgical process of producing sponge iron from iron oxides (mainly from lump iron ores or pellets) directly in the solid phase. The product of this solid state route has a honey comb structure with minute pores. Hence this product is most commonly known as sponge iron/direct reduced iron (DRI). In addition to the metallic iron content sponge iron contains some unreduced iron oxides and gangue. Since there is no separation of impurities in DR process, all the gangue present in the original oxide (silica, alumina, oxides of phosphorous) goes in to the product sponge iron. In fact concentration of these oxides increases due to the removal of oxygen to a level of plus 90%.

Hot DRI in the form of pellets, lumps, fines at a temperature of 650-850 deg C is passed through hot briquetting machine where the product is pressed between the rolls at extremely high pressure to produce highly compacted pillow shaped material called hot briquetted iron (HBI).

While producing sponge iron some amount of sponge fines of minus 4mm is also generated. This sponge fines is briquetted in cold condition using binders in the cold roller press to produce highly compacted pillow shaped material called as cold briquetted iron. (CBI)

brick briqutter to make biomass and wood sawdust briquette

brick briqutter to make biomass and wood sawdust briquette

Biomass brick briquetter is the production of biomass/wood/sawdust briquettes special equipment. The unit applies to the branches of trees or wood waste into wood chips by the pulverizer. Then this wood processing equipment for the high-density dry biomass block, thereby achieve sawdust convenient storage, transport and use as fuel. The units products not only save energy but also reduce carbon emissions, it is an efficient, clean and renewable energy.

The briquetter is no fixed foot installation, the entire device is fixed to a base frame welding, bins through bracket coupled to the base frame, the hydraulic part of the installation box at the bottom of the material; Forming part by three hydraulic cylinders and mold composition; hydraulic station and electric control cabinet are fixed to the base frame; conducive to the overall convenience of movement. To ensure the safety of users, this device is equipped with a whole outer plate, in normal operation, and prohibit open the wrapper. The hydraulic system of the hydraulic station, the operating member, the coupling components. Hydraulic components including tank, pump motor group, Manifold group consisting of; the operating member comprises various actions cylinders; each coupling member comprises a coupling conduit. The electrical control system is mainly composed of the electrical control cabinet and its internal components, including the main components of operating the touch screen, PLC and other components,

The unit will feed, waste wood or straw and other biomass materials pulverized into powder particles from the raw material through the cyclone fan it will be crushed to tank, transported by the variable speed feeder to the granulator, finished particles by vibrating screen into the cooling conveyor, cooled to near room temperature, and thus easy to transport and storage. Scrap entering the hopper via the inlet feed cylinder chamber into the mold cavity under the effect of the feed cylinder, the cylinder then pressing action causes particle shape, and then open the clamping cylinder through the pressure switch, the clamping jaws mouth let lose pressure molding block discharge. Metal impurities, sandstone blocks, concrete blocks and other pollutants could easily lead to the body parts to wear before entering the feed hopper should be cleaned out. As far as possible to maintain the stability of raw material moisture content and form, depending on the material properties, material moisture content below 8% or higher than 20% could easily lead to compact hardness changes, resulting in loose or uneven length.

coal stone briquette process in israel

coal stone briquette process in israel

High Pressure Briquette Press Machine For Sponge Iron Ball. High Pressure Briquette Press Machine For Sponge Iron Ball Making . Gy High-Pressure Ball Press Machine Is A Kind Of Pelletizing Machine Which Can Feed Various Kinds Of Dry And Wet Powder Through The Preliminary Pressure Device Compulsorily Into The Roll Press Area And Make Into High Bulk Density Ball. It Is Mainly Applied In The Coal ...

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Aug 04, 2016 Process The Dried And Granulated Raw-Material Is Fed Into The Machine With The Help Of In-Feed Screw Conveyor. Further, The Material Enters Into The Machine Keep, The Keep Worm Pushes The Material Into The Briquetting Chamber. The Biofuel Briquettes Are Formed In The Briquetting Chamber Without The Need Of Any Binder With High Pressure Mechanical Punch.

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5 types of coal briquette machine. review the briquetting plant and benefit

5 types of coal briquette machine. review the briquetting plant and benefit

Coal briquette is made by the coal briquette machine which uses coal dust or coal fine as the raw material. Sometimes we add other materials like the binder or something to make the briquette as most of the coal fine is hard to form together only by briquette machine.

When we mine the coal, transport it, dry it, there comes a lot of coal dust. As matter of fact, about 20% of the coal we can get is in small particles. So, coal briquette is a good way to deal with these fine or dust as briquette has more burning value and utilization rate.

As we all know, moisture is very important in briquette making no matter what your material is. Before you make your coal briquette with a coal briquette machine, make sure the moisture is proper for coal briquette making, and also notice, different briquette machines are with the different requirement on raw materials moisture.

Molasses and hydrated lime Molasses and other additives Coal tar pitch or petroleum bitumen (asphalt) Starch with or without additives Lignosulphonates Resins and hardeners Sodium silicate Bentonite Plastic clay Lime and sodium Argo waste Cow dung Lignin

Most of the coal briquette plant using binder ways to make coal briquette, If you are planning to add the binder to make coal briquette, remember, the smaller the binder particles are, the better binder effect is for coal briquette plant. The usage and the cost of the coal briquette are important things for choosing the binder. Fuel coal and coking coal will be much different in choosing the binder. You may also add other materials for reducing the cost of the briquette or a protection for the environment.

Coal is one special material on the briquette making process as one important binder sodium humate can be made from coal. In fact, if we keep our coal dust with certain moisture and put them in a place for 8-24 hours, the sodium humate will be produced by the coal dust and even the coal can be briquette without binder. Also for some of the coals, there appear clays which are a very good binder for coal briquette, we can also briquette those coals without adding other binders.

The coal briquette production process involves the following steps. a) Crushing/grinding of coal; b) Preparation of binders in semi-liquid form; c) Mixing of coal with binders; d) Briquette making; e) Drying; f) Packing.

The roller briquette press machine makes a continuous coal briquette process with large capacity. With one briquetter, the capacity can even to 35 t/h. The briquette is also easy to be packed with packing machines. The roller coal briquette is the most popular in the industry.

Hydraulic roller briquette press machine briquette the coal fine with a much higher pressure than normal type. The loading coal fine is with low moisture and low binder content or a binder free way. It costs more electric on each briquette but saves lots of energy on the briquette drying section.

Extrusion briquette maker is an ideal briquette machine for coal briquette making in industry. The shape of the briquette is much different from the roller briquette presses, the briquette is made with low energy cost.

Coal charcoal briquette making machine makes coal briquette with honeycomb/beehive shape which is very popular in home usage. The machine is easy to set up and operate. It is the most popular coal briquette machine in developing countries with a small investment.

Log briquette maker is a good choice for coal briquette making, the briquette maker has a very high pressure and a stable pressure holding time. With thesecharacteristics, the coal fine briquette in the machine with alow binder or even with binder free way like the hydraulic roller briquette press.

different briquette binder for coal briquette, coke briquettes

different briquette binder for coal briquette, coke briquettes

The inorganic binder has a wide source, low price and certain viscosity. The coal/coke briquette made with inorganic binder has high temperature resistance, good thermal stability, high strength and low sulfur content, but the calorific value is reduced due to the high ash content.

Clay and lime are the earliest used inorganic binders for coal briquetting. Lime is the most widely used binder of these two binders, and the resulting coal briquette has good reactivity and has a sulfur-fixing effect.

Organic binders such as tar slag and coal tar pitch have good bonding properties, which can significantly improve the cold mechanical strength and thermal strength of coal briquette. But these binders are easily decomposed at high temperatures, resulting in the disappearance of bonding effect, they have a weak contribution to the performance of coke briquette.

Coal tar is one of the main by-products of coke production. It is dark brown and viscous, heavier than water and low in ash. It is a mixture of various organic substances. The softening point is similar to that of coal tar soft asphalt. It is a very good hot melt type binder.

Distillation is generally used to remove light fractions having a low boiling point, and the heavy fraction having a higher boiling point is concentrated to obtain a similar asphalt property, and the bonding property is remarkably improved, thus it can be used alone as a coal briquette /coke briquette binder.

The tar residue has high calorific value and high organic fixed carbon content. As a binder, it can be used as the binder for the coking coal, which can save limited coking coal resources, and is the best way to solve the utilization of waste slag resources. It has significant social benefits and economic benefits.

Coal tar pitch contains aromatic and heterocyclic compounds. It is polar and has a strong affinity with coal, together they can form polar covalent bonds. The strength of coal tar pitch coal briquette is high. Many pulverized coal briquette or coal coking factories use coal tar pitch as a binder.

After physicochemical modification, cellulose, hemicellulose and lignin are degraded to different extents, leaving solid phase fiber components to be connected, net coal particles, making chemical bonds formed between the coal particles. The obtained liquid sugars, pectins, tannins and the like also have a binding action.

The use of industrial waste as a coal briquette and coke briquette binder can realize the resource utilization of waste, save coking coal resources, increase coke production, and solve the environmental pollution problem caused by conventional waste treatment methods.

It has colloidal properties. The humic acid binder has strong polarity and is easy to bond with the surface molecules or molecules in the micropores, this could lead to a certain strength coal briquette.

Inorganic binders are widely available and low in price, but the resulting coal briquette has reduced calorific value, poor moisture resistance, poor water resistance and high ash content. The organic briquette obtained from the organic binder has a high mechanical strength in the cold state, but is easily decomposed and burned at a high temperature, but has less residual ash after combustion. The composite binder complements each of the two binders, resulting in an increase in the quality of the coal briquette and coke briquette.

how to make biomass briquette and pellet - biofuel technology

how to make biomass briquette and pellet - biofuel technology

Moreover, the production and processing of biomass forming fuel are convenient, the use and operation are simple, the economic benefits are considerable, and it is harmless and pollution-free. Therefore, the research and promotion of biomass fuel briquetting or pelletizing have great social and economic benefits.

Since the 1930s, Japan has studied the application of mechanically driven piston molding technology to treat wood waste. In 1954, it developed a rod fuel molding machine. In 1983, it introduced pellet production fuel production technology from the United States. In 1987, there was more than a dozen. The pellet-forming fuel plant is put into operation, producing over 10,000 tons of material pellets per year.

In order to alleviate the pressure of conventional energy shortages and environmental pollution, the United States has built bark fuel briquetting plants with a daily output of 250-300 tons in 25 states.

Western European countries also attach great importance to the development and utilization of biomass renewable energy. Since the 1970s, they have developed and produced stamping briquetting machines and pellet machines. Italy, Denmark, France, Germany, Sweden, Switzerland and other countries have successively built factories of more than 30 on biomass pellet machines producing. And mechanically driven piston bio coal briquetting machines manufacturers of more than 40.

At present, biomass fuel production technology is broadly divided into two categories: biomass rod-shaped solidification briquetting fuel production technology and biomass pellet fuel production technology.

The biomass raw materials are crushed by a crusher, and then dried or sprayed with water (different briquetting equipment requires a different moisture content of the raw materials. When the raw materials with high moisture, they need to be dried with the drying equipment. While the raw moisture is too low, the spray water is used to increase the moisture. ), then after raw materials meet the moisture and size requirements, they are passing through the rob briquetting machine to make the bio coal briquette. If further deep processing of the product is required, carbonization can be carried out to produce a charcoal of high calorific value.

Screw briquetting produces rod-shaped high-density hollow molding fuel by spiral extrusion (find the screw briquetting machine on briquettesolution.com), which can improve the burning performance of loose waste and improve the value of waste (the briquettes can be made of high-quality charcoal by carbonization).

Biofuel briquetting is based on forest product processing waste (sawdust, shavings, etc.) and crop waste (straw, rice hull, etc.), used in industry and daily life or as a raw material for the production of activated carbon.

Production test and analysis results show that the briquetting machine has the benefits of improving the service life of the wearing parts, reducing the energy consumption per unit of finished product, working stably, briquetting reliable, low cost, short payback period, environmental protection.

The principle of the ring die pellet machine is to utilize the internal system of the ring mold, the pressure is applied from the inside to the outside by the pressure roller to cause the fuel to be extruded. The machine is a device for extruding pellet fuel by an inner ring molding roller.

how moisture affects the biomass briquetting process

how moisture affects the biomass briquetting process

Among them, the moisture of raw materials is an important factor in the process of biomass briquetting. The proper moisture content can make the briquetting effect on the best condition. A moisture too high or too low will adversely affect the briquetting process.

As a kind of indispensable free radical, the water in the biomass flows between the biomass particles, and under the action of pressure, it is mixed with pectin or sugar to form a colloid, which acts as a binder.

The appropriate amount of bound water and free water make the internal friction between the particles becomes smaller, the fluidity is enhanced. Thereby promoting the particles to slide under the action of pressure and fitting, with the role of lubricant.

For example, if the moisture is too low, the trace moisture is vaporized at a high temperature, which will facilitate the rapid conduction and uniform distribution of the heat flow, thereby lowering the softening point of the lignin, resulting in difficulty in briquetting.

The density of the biofuel briquette is in proportion to the moisture of the raw biomass. The density of the biofuel briquette is maximized and remains relatively stable over a suitable moisture range;

The biofuel briquette produced by the lower moisture raw material having the tendency to absorb moisture in the air, causing the biofuel briquette to burst and deform, as well as reducing the briquette density.

If the moisture of the raw material is too high, the particles can be sufficiently extended in the direction perpendicular to the maximum principal stress. Although the particles can be meshed with each other, since more water in the raw material is extruded, it is distributed between the particle layers, so that the particles are dispersed. The layers do not fit snugly and therefore cannot make the briquette to be formed.

Moreover, too much water vapor increases the distance between molecules, affects heat conduction, lowers the briquetting temperature, makes the lignin in the raw biomass difficult to melt, and the crude fiber is not easy to soften, resulting in a decrease in the bonding force.

During the biomass briquetting process, as the shaped fuel in the forming cone and the retaining cylinder is subjected to the radial forces exerted by the tapered sleeve and the retaining cylinder, this will generate friction and consume a certain amount of energy.

At the same time, a part of the heat of the preheating material of the biomass briquetting machine is consumed on the excess water, the evaporated water is quickly vaporized, but the steam cannot be discharged from the molding cylinder in time, resulting in volume expansion, occupying an increase in space, easily forming a gas blockage, and forming large steam pressure in the longitudinal direction of the cylinder.

But when its big, it will cause the material to be quickly ejected out of the forming cylinder, causing the phenomenon of shooting, briquette cannot be made then. It will also cause damage to the surrounding environment and may even affect personal safety.

After the biofuel briquette is extruded from the forming sleeve, the expansion and disintegration due to the high-pressure water vapor inside the biofuel briquette may affect the subsequent packaging and transportation and the briquetting characteristics of the briquette.

The moisture of the raw material is related to whether the biomass can be compressed into briquette, which has a significant effect on the relaxation density of briquette. Whether the moisture content is too high or too low, the briquette with better relaxation density cannot be obtained.

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