Numerical simulation of the direct reduction of pellets in a rotary hearth furnace for zinc-containing metallurgical dust treatment

The current development of derect reduction technology for rotary hearth furnace (RHF) is introduced. It is essential to stable and continuous operation of the RHF carrying out the following technologies: the cold-pressing technology，design of the charging machine and discharging machine of the RHF, temperature, pressure and atmosphere in the furnace, and the antioxidation of the metallized pellets. The current develop situation of these technologies are fully discussed.

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Development Prospect of Rotary Hearth Furnace Process in China

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.746.533 ◽

2013 ◽

Vol 746 ◽

pp. 533-538 ◽

Cited By ~ 9

Author(s):

Ying Yi Zhang ◽

Yuan Hong Qi ◽

Zong Shu Zou ◽

Yun Gang Li

Keyword(s):

Resource Allocation ◽

Iron Ore ◽

Direct Reduction ◽

Reduction Process ◽

Economic Security ◽

Practical Significance ◽

Low Grade ◽

Rotary Hearth Furnace ◽

Hearth Furnace ◽

Direct Reduction Process

Summarized the development situation of rotary hearth furnace (RHF) direct reduction technology, ore resource allocation situation and direct reduction iron demand. The survey results show that: China's iron ore resource allocation heavily rely on imported iron ore, gas-based direct reduction process (MIDREX, HYL-III, FINMET) is not likely to be the mainly direct reduced iron (DRI) process in China. However, non coking coal resources is very rich in China, research and development of coal-based direct reduction process (such as FASTMET and ITMK3 process) has important practical significance, it can strengthen the comprehensive utilization on low grade iron ore, associated mineral resources and iron & steel plant dust and sludge. It has great significance to alleviate steel scrap demand and stable development of the iron and steel industry and protect the national economic security in China.

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Numerical Analysis of Radiative Heat Transfer and Direct Reduction of Three-Dimensional Multilayer Ellipsoidal Carbon-Containing Pellet Unit in the Rotary Hearth Furnace

Metals ◽

10.3390/met10080994 ◽

2020 ◽

Vol 10 (8) ◽

pp. 994

Author(s):

Nan Li ◽

Feng Wang

Keyword(s):

Heat Transfer ◽

Removal Rate ◽

Direct Reduction ◽

Reduction Process ◽

View Factor ◽

Radiant Heat Transfer ◽

Rotary Hearth Furnace ◽

Reduction Degree ◽

Hearth Furnace ◽

Direct Reduction Process

It is very important for a multilayer pellet bed to have a proper description of the radiant heat transfer and direct reduction process in the rotary hearth furnace. Ellipsoidal pellets may also be used in industrial production. The research on this ellipsoidal pellet bed will provide comprehensive data support for the production process. Besides, the view factor is one of the important factors affecting the heat transfer of the multilayer pellet bed. It is of great significance to study its value and distribution. In this study, the effects of the gas field and the bottom of the furnace on the direct reduction of multilayer ellipsoidal pellets were considered. The local environmental viewing angle coefficient in the model was obtained through the mechanism calculation method, which is more accurate than the calculation through the radiation exchange network. Furthermore, the porosity variation in the pellet during the direct reduction process was also considered. According to the calculation, it was found that the higher initial temperature at the furnace bottom is beneficial to increase the degree of metallization (DOM) and zinc removal rate (ZRR) for all pellets, and is more advantageous to the lower pellets in the material bed. Nevertheless, the reduction degree of the lower pellets is still smaller than that of the upper pellets. The results also show that increasing the offset ξ has a greater effect on increasing the ambient view factor and each position reduction degree in the ellipsoidal pellets layer. Results can be applied for the optimization of pellets distribution in a rotary hearth furnace.

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The Production and Utilization of Two Smelting Processes for V-Ti Magnetite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.881-883.1297 ◽

2014 ◽

Vol 881-883 ◽

pp. 1297-1300

Author(s):

Zhao Hui Zhang ◽

Wei Ming Kong ◽

Fu Cai Zhao ◽

Xi Dong Xie

Keyword(s):

Blast Furnace ◽

Large Scale ◽

Raw Materials ◽

Direct Reduction ◽

Mineral Resources ◽

High Energy ◽

Rotary Hearth Furnace ◽

Hearth Furnace ◽

Product Price ◽

Blast Furnace Production

In this paper, two processes for V-Ti magnetite smelting were introduced, the processes respectively are the conventional blast furnace-BOF process and the high-profile rotary hearth furnace direct reduction technology. The two kinds of processes were introduced briefly, and the problems of the two processes in the production of V-Ti magnetite were analysed. The blast furnace-BOF process with the relatively perfect, large output, high energy efficiency can't make full use of Ti in the mineral resources, in this way, the resource was wasted and the environmental were polluted, and the existence of Ti in slag can also bring a series of problems in blast furnace production. Rotary hearth furnace direct reduction technology has the advantages of high reduction temperature, low product price, flexible selection for raw materials and reducing agent, while the large scale of equipment brings a series of problems to the production and design.

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