Study on the Characteristics of Formed Coke (I)

Ida, Sirou; Okuhara, Toshiaki; Yamaguchi, Tokuji

doi:10.3775/jie.51.8_645

Cited by 1 publication

(3 citation statements)

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“…In the first trial, the moisture content of coal was set at 8, 10, and 12% by adding a small amount of water. After briquetting the coal with 3% lignin, followed by carbonization; the density of the resultant coke was approximately 1.1 g/cm 3 and the strength was very low regardless of the coal moisture content (Fig. 1).…”

Section: Cold-press Methodsmentioning

confidence: 99%

“…Hiroshi NONAKA, 1) * Takahiro TOMONO, 2) Yoshihiro NAGASHIMA 2) and Masahito KITAO 3) the latter is better at increasing the ratio of non-coking coal. So far, many binders to briquette coal have been tested: conventional coal tar pitch 5) including soft pitch, 6) bituminous binders, 7) blend of resole, novolac, and coal tar pitch, 8) blend of molasses and coal tar pitch, 9) the extract from direct coal liquefaction residue, 10) and inorganic binders such as bentonite.…”

Section: Preparation Of Formed Coke For Blast Furnace Using Kraft Lig...mentioning

confidence: 98%

“…There are several blast furnace-formed coke production processes and pilot-scale test results in various countries. 3,4) There are two options: one is the hot briquetting method in which coal is preheated to the plasticized zone and the other is the cold molding method using a binder. The former method still requires coking coal with caking property, and…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Formed Coke for Blast Furnace Using Kraft Lignin as a Binder

Nonaka,

Tomono,

Nagashima

et al. 2023

ISIJ Int.

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In the steel industry, the development of a coke production technology that uses low-grade coal is desired. Decarbonization by the use of plant biomass is also an important option. A candidate is formed coke, which is produced by forming non-coking coal using a binder, followed by carbonization. Kraft lignin, by-product in pulp and paper mills is a potential binder because it is an aromatic polymer dissolved from wood. In this study, thermal coal powder was blended with softwood kraft lignin powder at ratios from 0 to 20% and was briquetted by cold-pressing or hot-pressing. Then, the briquette was carbonized at 1 000°C to produce formed coke. To verify whether the formed coke has sufficient strength for use in blast furnace, the product was subject to indirect tensile test. The tensile strength of the carbonized formed coke increased with increasing lignin content; however, a formed coke exceeding the target tensile strength of 5 MPa could not be obtained by cold forming. The briquetting temperature was the determinant strengthening factor of the formed coke. Formed coke produced by hot-pressing at temperatures higher than 150°C with 10% lignin at a pressing pressure of 150 MPa successfully attained the target strength. The tensile strength of the formed coke did not always correspond to the density of the corresponding coke, indicating that carbonized products originating from lignin play a role in strongly binding coal particles. Softwood kraft lignin seems a good binding material for low-grade coal to produce formed coke with high strength.

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Section: Cold-press Methodsmentioning

confidence: 99%