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binders and bonding mechanism for rhf briquette made from

Blast furnace dust is a kind of solid waste generated in the process of blast furnace ironmaking. It’s treated as a kind of precious secondary resources, because its main components are C, Fe and a spot of recyclable non-ferrous metal elements, such as Zn, Pb, K, Na, etc.1,2) However it is harmful to human health, because it is characterized by easily floating in the air, due to its small particle size and low density. Therefore, the comprehensive utilization of blast furnace dust, not only has the good economic benefits, but also has the considerable social and environmental benefits.3)

At present, most of companies utilize blast furnace dust directly or indirectly through mineral processing such as sintering process, in order to recycle the iron and carbon in it. However, some companies sent it to cement plant as ingredient or directly store it. These methods can’t obtain the purpose of reasonable use of blast furnace dust resources.4,5) Considering the cyclic economy, the blast furnace dust should be regarded as precious secondary resources and got fully comprehensive utilization and recycling.6) Application of blast furnace dust to RHF (Rotary Hearth Furnace) briquette is an effective and comprehensive utilization method,7,8) however, RHF has a high standard of the material strength, a series of treatments such as drying, burden distribution and discharging is necessary, the strength of material in each part affect the smooth and efficient production of RHF.9,10) Therefore, adding suitable binder to improve strength of the briquettes is a key issue

But there are less studies on binder that is suitable for blast furnace dust in China and abroad, and some researches on binder in metallurgical field mostly focused on the iron ore concentrate briquettes.11,12,13) Binder used in briquetting process can be divided into inorganic binder, organic binder and compound binder, and all of them have respective advantages and disadvantages:14) (1) The inorganic binder such as bentonite has a long history and mature experience of using it, and it has significant effect on the performance of briquettes, however, due to it’s many impurities, the appropriate control of supplying amount is necessary, such as the 1.5%–2.0% mass fraction of bentonite is appropriate. (2) Adding organic binder will not increase the content of harmful elements in the briquettes, but its performance at high temperature is poor, which has a great influence on the decrepitation temperature of briquettes, and its price is high. (3) The use of compound binder can reduce the supplying amount of inorganic binder, reduce the cost of briquettes, improve the quality of briquettes, and get better performance of briquettes. Therefore, considering the development direction of binder, organic binder15) andorganic-inorganic compound binder16) has become the focus of research and development

binders and bonding mechanism for rhf briquette made from

In this study, the properties of blast furnace dust and binders have been investigated firstly. Based on which, the experiments of the briquettes added binders were studied through measuring the strength of green briquettes, dried briquettes and briquettes after roasting. Then the bonding mechanisms of binders were discussed. This study will provide theoretical and technical basis on economical and rational use of blast furnace dust

Blast furnace dust used in the experiment were from a Chinese steel plant. The chemical composition and mineral component measured by X-ray diffraction of blast furnace dust is shown in Table 1 and Fig. 1, respectively. The particle size is shown in Table 2. The blast furnace dust not only contains T.Fe and C, but also contains some Zn, Pb, K, Na, etc. The content of Zn has reached more than 13%. The particle size of blast furnace dust is relatively fine, mass% of the dust under –200 mesh reached 62.75% and the average particle size is 0.103 mm. In addition, the carbon content is 32.21%, the carbon/oxygen is 1.8, and the carbon content is extremely excess. Based on this, in order to make full use of excess carbon in the blast furnace dust, 20% of iron oxide should be added into the briquettes, and the carbon/oxygen ratio is regulated to 1.2

the development of cokemaking technology based on the

The development of cokemaking technology based on semisoft coking coals known to yield low-quality coke is of great importance for cokemaking industries throughout the world because the quality of metallurgical coal is expected to continue to deteriorate in the near future. This chapter explains the technological principles behind semisoft coking coal utilization from the viewpoint of the mechanism of carbonization and reviews the development and commercialization of technologies, such as briquette blending carbonization process, coal moisture control, dry-cleaned and agglomerated precompaction system, formed coke process, and super coke oven for productivity and environment enhancement toward the 21st century

improving the performance of conventional and column froth

Many existing mining operations hover on the brink of producing competitively priced fuel with marginally acceptable sulfur levels. To remain competitive, these operations need to improve the yield of their coal processing facilities, lower the sulfur content of their clean coal, or lower the ash content of their clean coal. Fine coal cleaning processes offer the best opportunity for coal producers to increase their yield of high quality product. Over 200 coal processing plants in the U.S. already employ some type of conventional or column flotation device to clean fines. an increase in efficiency in these existing circuits could be the margin required to make these coal producers competitive

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