The effect of coal levels on phosphorus removal from a high phosphorus oolitic hematite ore after direct reduction roasting have been investigated. Raw ore, coal, and a dephosphorization agent were mixed and the mixture was then roasted in a tunnel kiln.The roasted products were treated by two stages of grinding followed by magnetic separation. XRD …
cheap and abundant natural gas. A direct reduction method using tunnel kiln is one of the reduction methods that need a very low volume of water for the process in which sponge iron is produced. A tunnel kiln (Figure1) is a long stationary insu-lated furnace made of refractory bricks which has a rail track provision for trolley movement.
Finally, the reduction process was demonstrated in a solar-heated packed-bed reactor up to 1000 °C, confirming the feasibility of renewable iron production from complete ore reduction at moderate temperatures (starting above 400 °C), and thus paving the way toward decarbonation of the iron and steel metallurgical industry.
process of the iron ore reduction using the ... a rotary kiln. The iron ore and the coal were taken from South and East Kalimantan respectively. There are two main reasons in
The case studies of processing of low grade iron ore fines from iron ore mines, processing of iron ore beneficiation plant tails have been discussed where in the pellet grade concentrate and cement grade iron concentrate were produced at …
The direct reduction of iron in a tunnel kiln is a volumetric process in which raw material consumption is determined by the volumetric capacity of refractory crucibles.
The invention discloses a technology for producing sponge iron in a tunnel kiln. The technology mainly solves the problems that an existing tunnel kiln technology is low in capacity, high in energy consumption, large in loss and the like. Raw materials, a reducing agent and additives are mixed and subjected to ball milling to obtain a ball grinding material; the ball grinding material …
The product resulting from the carbon monoxide reduction of iron ore concentrates is commonly lmown as sp
During the solid-phase reduction of high-iron red mud, the intermediate product FeO produced by the reduction easily reacts with impurities Al 2 O 3 and SiO 2 in the red mud to form hard-to-reduce ...
Laboratory experiments and industrial tests show that coal level is an important factor affecting direct reduction in tunnel kiln process ... iron ore, the process of direct reduction followed by ...
In this process, a stationary bed of material passes through preheating, reduction and cooling sections. The coal and iron ore are loaded into a refractory crucible, packed in a tubular format (Fig. 1) and enters from the feed end of the tunnel kiln.It comes out on the other end by traveling inside the kiln with a prefixed speed.
PDF | On Apr 1, 2010, Swaren Bedarkar and others published Production of Sponge Iron through Tunnel Kiln Process | Find, read and cite all the research you need on ResearchGate
The invention discloses a direct reduction anti-oxidation covering agent for an iron ore tunnel kiln and a preparation method thereof. The covering agent is composed of casting sand, quick lime, calcined soda and cement. The weight ratio of the casting sand, the quick lime, and the calcined soda is 70-90:20-5:10-5. The weight of the cement is 0.5%-1% of the total weight of the casting …
The present invention also provides a kind of tunnel cave for Iron Ore Powder direct-reduction, comprise kiln body, through the track of kiln body, chassis is in orbit set and is laid in the combustion system on kiln body, also comprise thermoconductive material board, described thermoconductive material board is arranged in kiln body, and the burner hearth between …
One of the first development with a patent from the year 1918 was the Höganäs tunnel furnace process for fine ore reduction with carbon [3]. In the beginning of the 1930ies the Krupp-Renn …
The metallic iron in this process is produced by the reduction of iron oxide below the fusion temperature of iron ore (1535 deg C) by utilizing carbonaceous material present in the non-coking coal. As the iron ore is in direct contact with the reducing agent throughout the reduction process, it is often termed as direct reduced iron (DRI).
Although iron powder could be produced in sponge iron tunnel kiln production line and it is the main raw material for powder metallurgy production lines. Process. In sponge iron production plant by tunnel kiln method, after crushing and screening raw materials, iron ore, coal and limestone are mixed and charged in storage bins in certain ratios.
1. Tunnel Kiln or Hogonas process Small lumps of rich iron ore, sinter, pellets, or fine ore are charged into a sealed sagger along with a mixture of coke and limestone. The saggers, loaded …
Effect of heating rate on the properties of two non-coking coals in thermal regime of tunnel kiln direct reduction of iron (TKDRI) process has been investigated.
The straight tunnel kiln for the direct reduction of the iron ore powder, provided by the invention, has the advantage that the egg-shell effect is avoided. ... and the outlet of described discharging machine 13 is connected with anti-oxidation pond 14.The chassis 4 of annular tunnel kiln is in running status in process of production always ...
The direct reduction process uses powdered iron ore, avoiding the sintering process The direct reduction process can use natural gas contaminated with inert gases, avoiding the need to these gases for other use [4]. The process of DRI or sponge Iron making can be classified into different categories as given below: (A) Rotary Klin Process
1930-1950s Saggers in Tunnel Kilns- Small Shaft Furnace- Rotary Kilns- Hogganas- Wiberg- Krupp & Lurgi- Coal Based Coal Based Coal Based 1950-1960s Static Reactors- Fluid bed Reactors- ... The full form of FIOR process is Fluid Iron Ore Reduction process. In this
Sponge Iron, also known as Direct Reduced Iron is the product produced out of using iron ore. The iron ore is processed through reduction process by the use of gas that emits from natural coal gas resource. CASE Group of Industries manufactures sponge iron by using tunnel kiln, following reduction of iron ore through Static Kiln Briquetted Iron ...
Tunnel Kiln Technology Process for Sponge Iron . Crushing and screening of raw materials; Mixing iron ore, coal and limestone ; The mixed iron ore, coal and limestone are charged in storage bins in certain ratios. Raw materials mix is charged in SiC crucibles through an automatic charging system; Crucibles are transported by wagons to the ...
This process involves a modified tunnel kiln designed to produce sponge iron without going through any intermediate stage of agglomeration and indurations, thereby saving energy in the tune...
In the current work, an attempt has been made to use mill scale and iron concentrate which are not applicable to pelletized, in the reduction process with tunnel kiln for iron manufacturing. Non-coking coal and limestone were utilized …
In the year 1908 use of tunnel kiln started for iron oxide reduction. This process was invented by Sieurin as Hoganas process [3]. In 1954, more kilns came into operation in …
Fig 2 Principle of direct reduction process. Gas based process. In the gas based reduction processes, a vertical shaft kiln is used in which iron ore is fed into the top of the kiln and finished sponge iron is drawn off from the bottom after cooling it so as to prevent its re-oxidation.