Bonding Mechanism and Process Characteristics of Special Polymers Applied in Pelletizing Binders

Zhao, Hongxing; Zhou, Fengshan; Ma, Cunfa; Wei, Zhongjin; Long, Wei

doi:10.3390/coatings12111618

Cited by 8 publications

(2 citation statements)

References 102 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Numerous studies have demonstrated that replacing or partially replacing bentonite with organic binders is feasible. However, due to their high cost and thermal instability, they are not widely utilized [8][9][10][11] . The use of low-cost solid waste as binder raw materials is also a research hotspot.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Degree of Sodic Modification of Bentonite Using Response Surface Analysis

Mo,

Feng,

Zhou

et al. 2024

ISIJ Int.

View full text Add to dashboard Cite

Sodium modification is an effective approach for enhancing the properties of bentonite and reducing its usage in pellets. However, due to limited research, the relationship between the physicochemical properties of bentonite and its green ball properties remains unclear, and the optimal degree of modification for bentonite has rarely been discussed. Therefore, this paper proposes a novel research idea: to exploring the correlation between the five most commonly used indexes for evaluating the physicochemical properties of bentonite (water absorption, methylene blue index, swell capacity, colloid index, and cation exchange capacity) and the most frequently used evaluation indexes for assessing green ball performance (drop strength), in order to determine the optimal degree of sodium modification of bentonite for pellets. The response surface methodology was employed in this paper to investigate the quantitative relationship between the five indexes and the green ball drop strength. The results demonstrate that when the drop strength of the green ball reaches its optimal level, the five commonly used indicators of bentonite are as follows: water absorption is 545.27%, methylene blue index is 22.94g/100g, swell capacity is 72.36ml/g, colloid index is 35.95ml/g, and cation exchange capacity is 68.93mmol/100g. Under these conditions, it has been the predicted value for green ball drop strength is determined to be 12.88, which exceeds the maximum value in the experimental conditions by 48.05%. The study determined the optimal degree of sodium modification for bentonite in pelletizing, providing valuable guidance for optimizing the properties of bentonite.

show abstract

Section: Introductionmentioning

confidence: 99%

Determination of the Degree of Sodic Modification of Bentonite Using Response Surface Analysis

Mo,

Feng,

Zhou

et al. 2024

ISIJ Int.

View full text Add to dashboard Cite

show abstract

“…Several studies and research have already been conducted to test organic binders as alternative binders to bentonite [11][12][13][14][15][16][17][18][19][20][21]. A combination of boron compounds with organic binders such as carboxymethyl cellulose (CMC), starch, dextrin, and some organicbased binders was tested [13,14].…”

Section: Introductionmentioning

confidence: 99%

Developing Iron Ore Pellets Using Novel Binders for H2-Based Direct Reduction

Parathodiel,

Mousa,

Ahmed

et al. 2023

Sustainability

View full text Add to dashboard Cite

The transformation from traditional iron- and steelmaking technologies to green H2-based new technologies will require an improvement in the quality and purity of iron ore burden materials. Iron ore pellets are essential inputs for producing direct reduced iron (DRI), but the conventional binders, used in iron ore pelletizing, introduce gangue oxides to the DRI and consequently increase the slag generation and energy consumption in the steelmaking unit. Partial and/or full replacement of the traditional binders with novel organic binders would significantly contribute to improving the process efficiency, particularly in the next-generation H2-based direct reduction technology. This study illustrates the feasibility of pelletizing magnetite iron ore concentrate using four organic binders: KemPel, Alcotac CS, Alcotac FE16, and CMC, in comparison to bentonite as a reference. The study explores the influence of binder type, binder dosage, and moisture content on the characteristics and properties of the pellets. The efficiency of binders was characterized by the moisture content, drop number test, cold compression strength, and H2 reduction of pellets. For dry pellets, CMS was superior among other binders including bentonite in developing dry strength. After firing, the pellets produced by the partial replacement of bentonite with 0.1 wt.% KemPel demonstrate a performance nearly identical to the reference pellets. While the complete replacement of bentonite with organic binder shows a lower performance of fired pellets compared to the reference, it may still be suitable for use in DR shaft furnaces. The cold-bonded pellets demonstrate a superior reduction rate compared to fired pellets.

show abstract