Impact on the Reduction Process of Carbon Containing Pellets with Biomass Replacing Traditional Reducing Agent

2015 ◽  
Vol 1120-1121 ◽  
pp. 1302-1307
Author(s):  
Peng Yuan ◽  
Hong Liang Han ◽  
Dong Ping Duan
Keyword(s):  
Compressive Strength ◽  
Direct Reduction ◽  
Reduction Process ◽  
Reducing Agents ◽  
Reducing Agent ◽  
Volumetric Shrinkage ◽  
Bamboo Charcoal ◽  
Direct Reduction Process ◽  
Metallization Rate ◽  
The Impact

Considering the rotary hearth furnaces (RHF) direct reduction process, using bamboo char, charcoal and straw fiber as reducing agents added into the carbon containing pellets, the experimental study on the impact of reduction effect has been conducted from metallization rate, compressive strength and volumetric shrinkage. Test results showed that biomass reducing agents can replace traditional reducing agents used in the RHF direct reduction process. Compared with traditional reducing agents, biomass has less of effect on metallization rate, but different biomass reducing agents have large impact on strength and volumetric shrinkage of pellets. The compressive strength of pellet with straw fiber is relatively higher, and the compressive strength of pellets with charcoal or bamboo charcoal is low, for reaching the production requirement, which will be improved at higher temperature (1300°C). Using bamboo charcoal as reducing agent will lead to the swell of pellets in the beginning stage, and this situation will make the volumetric shrinkage at high temperature lower, finally, all of these will affect the strength of pellets and the heat-transfer between different material layers, thus it should be used accompanying with other reducing agent.

Direct Reduction of Limonitic Laterite Nickel Ore with Variation Type of Reducing Agents to Fe, Ni Content and Recovery by Using Coal-Dolomit Bed Method

2020 ◽  
Vol 867 ◽  
pp. 32-40
Author(s):  
Sungging Pintowantoro ◽  
Fakhreza Abdul ◽  
Dede Zulyansyah
Keyword(s):  
Direct Reduction ◽  
Reduction Process ◽  
Reducing Agents ◽  
Reducing Agent ◽  
The Other ◽  
Green Coke ◽  
Ni Content ◽  
Other Hand ◽  
Fe Content ◽  
Increasing Demand

The increasing demand for stainless steel and the scarcity of sulfide nickel ore affect the increase of laterite nickel ore processing. One of the processes that has been proven can be applied to process laterite nickel ore is direct reduction. In the direct reduction, the reduction atmosphere was adjusted by controlling the volume of CO and CO2 from carbon source materials, such as coal, charcoal, and green cokes. This research aims to analyze the effect of reducing agents type on nickel limonitic nickel briquettes on Ni and Fe content and recovery of Ni and Fe. The direct reduction process was conducted at 1400°C for six hours. The EDX test was conducted to analyze the elemental composition of the product, especially for Ni and Fe content. On the other hand, the XRD can be applied to analyze the compound formed in the product Greencoke will produce the highest Ni content (15.23%). The highest Ni recovery (96%) was obtained by the addition of green coke reducing agent. On the other hand, the highest Fe recovery (18.8%) was obtained by the addition of coal reducing agent.

Study on Utilization Technology of Vanadium Titanium Magnetite Based on the Rotary Hearth Furnace Direct Reduction Process

2012 ◽  
Vol 217-219 ◽  
pp. 441-444 ◽  
Author(s):  
Gong Guo Liu
Keyword(s):  
Recovery Rate ◽  
Large Scale ◽  
Direct Reduction ◽  
Reduction Rate ◽  
Reduction Process ◽  
Direct Reduction Process ◽  
Metallization Rate ◽  
Study Results ◽  
Vanadium Titanium ◽  
Titanium Magnetite

Through carrying out large scale of experiments, the process of ‘rotary harth furnace direct reduction—deep reduction electric arc furnace—extracting vanadium from vanadium bearing slag—extracting titanium from titanium bearing slag gets through and the recovery of Fe, V and Ti reached 90.77%, 43.82% and 72.65% respectively. With the study on the laboratory experiments and industrial tests, the bottlenecks of this technology such as low metallization rate of vanadium-titanium magnetite in direct reduction process, low reduction rate of vanadium in EAF, vanadium-recovery of hot metal with high silicon content, titanium-recovery of high –Mg &Al slag with titanium, and so on, have been solved. Based on this, the metallization rate of vanadium-titanium magnetite in direct reduction process is more than 90%, reduction rate of vanadium in EAF deep reduction process is more than 80%, vanadium-recovery rate in slag is more than 65%, and titanium-recovery rate in slag is more than 75%. That means good study results have been gotten. Furthermore, low-carbon pig iron with good quality in EAF steelmaking are gotten. Otherwise, V2O5 sheet and titanium products can meet the requirements of GB3283-87 and PTA121, respectively.

Separation of aluminium and preparation of powdered DRI from lateritic iron ore based on direct reduction process

2016 ◽  
Vol 55 (3) ◽  
pp. 345-355 ◽  
Author(s):  
T. Jiang ◽  
L. Yang ◽  
G. Li ◽  
J. Luo ◽  
J. Zeng ◽  
...  
Keyword(s):  
Iron Ore ◽  
Direct Reduction ◽  
Reduction Process ◽  
Direct Reduction Process

Numerical analysis of the carbon containing pellets direct reduction process

2021 ◽  
Vol 118 (2) ◽  
pp. 209
Author(s):  
Nan Li ◽  
Feng Wang ◽  
Wei Zhang
Keyword(s):  
Direct Reduction ◽  
Reduction Process ◽  
Operating Conditions ◽  
Utilization Efficiency ◽  
Heat Absorption ◽  
Furnace Temperature ◽  
Chemical Reaction Kinetics ◽  
Direct Reduction Process ◽  
Pellet Surface ◽  
Composite Pellets

In view of the carbon-containing composite pellets direct reduction process in rotary hearth furnace, a mathematical model coupling heterogeneous chemical reaction kinetics, heat and mass transfer of this process was established. The effects of furnace temperature (from 1273.15 K to 1673.15 K) and pellet radius (from 6 mm to 16 mm) on the direct reduction of carbon-containing composite pellets were studied by adopting computational fluid dynamics software. The pellet temperature and composition changes under different operating conditions were analyzed. CO and CO2 fluxes, heat fluxes on the pellet surface were especially studied. Total heat absorption by the pellet, CO and CO2 overflow from the pellet surface together with pellet degree of metallization (DOM) and zinc removal rate (ZRR) were calculated. Results show that with the increasing of furnace temperature or the decreasing of the pellet radius, the temperature difference between pellet surface and its center and the final DOM, ZRR increased. The larger the pellet radius, the smaller the heat absorption, also the smaller CO and CO2 overflow. But heat absorption and CO overflow per unit volume are higher. There is an optimal pellet radius with high CO utilization efficiency. Pellet porosity decreases at first and then increases with reducing time. It is also found that effective thermal conductivity is a major factor limiting the pellets temperature increasing. The reduction sequence of the pellets is Fe2O3→Fe3O4→FeO→Fe.

Characterization of semi-coke generated by coal-based direct reduction process of siderite

2015 ◽  
Vol 22 (8) ◽  
pp. 2914-2921 ◽  
Author(s):  
De-qing Zhu ◽  
Yan-hong Luo ◽  
Jian Pan ◽  
Xian-lin Zhou
Keyword(s):  
Direct Reduction ◽  
Reduction Process ◽  
Direct Reduction Process

scholarly journals A fundamental study on the production of rare earth metals (Sm, Eu, Tm and Yb) by direct reduction process.

1989 ◽  
Vol 105 (2) ◽  
pp. 175-180
Author(s):  
Kazuyoshi SHIMAKAGE ◽  
Kazuhiko ENDO ◽  
Tadao SATO ◽  
Hiroshi KATAYAMA
Keyword(s):  
Rare Earth ◽  
Direct Reduction ◽  
Rare Earth Metals ◽  
Reduction Process ◽  
Fundamental Study ◽  
Direct Reduction Process

Modelling novel coal based direct reduction process

2008 ◽  
Vol 35 (1) ◽  
pp. 3-13 ◽  
Author(s):  
J. Y. Shi ◽  
E. Donskoi ◽  
D. L. S. McElwain ◽  
L. J. Wibberley
Keyword(s):  
Direct Reduction ◽  
Reduction Process ◽  
Direct Reduction Process

Fundamental Study on Application of Gas-Based Shaft Furnace Direct Reduction Process to High Efficiency and Clean Utilization of Paigeite

2011 ◽  
Vol 233-235 ◽  
pp. 753-758
Author(s):  
Zhao Cai Wang ◽  
Man Sheng Chu ◽  
Zhuang Nian Li ◽  
Jue Tang ◽  
Qing Jie Zhao ◽  
...  
Keyword(s):  
Electric Furnace ◽  
Shaft Furnace ◽  
Direct Reduction ◽  
Reduction Process ◽  
Technical Problems ◽  
Direct Reduction Process ◽  
Comprehensive Utilization ◽  
Iron Concentrate ◽  
New Process ◽  
Reduction Swelling

The paigeite resources are abundant in China, but most of them are difficult to be utilized efficiently because of the current technical problems on industrial practice. It is necessary to perfected and innovated for comprehensive utilization of paigeite. The new process of gas-based shaft furnace direct reduction-electric furnace smelting separation provides a new way to efficient and clean comprehensive utilization of paigeite resources. In this paper, the pellets are prepared from boron-bearing iron concentrate. The mechanisms of roasting, the rules of reduction, and the properties of reduction swelling are also investigated. And then the pellets after reduction are smelted and separated in electric furnace to study the properties of products and analyze the feasibility and superiority of new technique. The results showed that boron-bearing iron concentrate is a kind of good raw material for pelletizing process. The properties of boron-bearing pellets after roasting for 20 min at 1200°C could meet to the requirements of gas-based shaft furnace direct reduction process, which exhibited fast reaction rate, good reduction swelling properties and high compressive strength both before and after reduction. With the new process, the efficient separation of boron and iron can be realized. The high boron grade and high activity of boron-rich slag obtained from new process can be used directly in boric acid manufacture. The new process shows excellent tech-economy feasibility to achieve efficiency and clean comprehensive utilization of paigeite resources.

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