Researchers of the Nekrasov Iron & Steel Institute, National Academy of Sciences of Ukraine, conduct studies aimed at developing analytical methods for predicting the strength characteristics of pellets. These studies use analyses of phase interaction mechanisms within free-flowing media to develop theoretical ideas on the formation of strong bonds in the pellets through adhesion. This led to the establishment of local models of adhesion processes for two basic particle interaction schemes: ‘particle + particle’ and ‘particle + liquid phase + particle’. Experimental studies undertaken in laboratory premises of the Nekrasov Iron & Steel Institute for the ‘particle + particle’ interaction scheme provided the foundation for a method to determine the strength characteristics of pellets made from fine-grained materials with zero moisture at compaction pressures ranging from 50 to 220 MPa. The first part of the paper justified methodological prerequisites for experiments to study strong bonds within the compacts for the ‘particle + liquid phase + particle’ interaction scheme. The methodological prerequisites accounted for the mechanical, physical, and physicochemical interactions, both between individual particles of the pelletized material and between the charge components (liquid phase). A generalized analysis of the experimental findings allowed evaluating a range of potential adhesion processes for the ‘particle + liquid phase + particle’ interaction scheme, pinpointing their manifestation, examining their nature, and assessing the effect of a liquid phase introduced into the pelletized charge, considering the compaction pressures applied. This paper focuses on experimental findings for the ‘particle + liquid phase + particle’ interaction scheme, establishing analytical relationships between the strength characteristics of pellets and integral indicators of the adhesive bond mechanism in this interaction scheme (in particular, relationship between the bulk density (ρ₀) and moisture content (W_m) for materials in the first group of systematization). Additionally, an analytical relationship between the compaction factor for compacts produced at a pressure (P) of 220 MPa (K_comp220), considering their loosening, and the bulk density of materials (ρ₀) in the first group of systematization was established for the first time. Analysis of the findings led to a hypothesis suggesting that the amount of the liquid phase (in particular, water) introduced into the material should be balanced by its potential displacement during compaction to achieve maximum compact strength. Based on the hypothesis, a novel equation was derived to calculate the amount of liquid binder (water) to promote the most favorable conditions for the adhesion processes, thereby imparting the maximum strength to compacts from materials in the first group of systematization. A comparative analysis between the experimental findings and calculations confirmed that the equation was accurate. Consequently, an analytical method was proposed to determine the moisture content needed in the charge to produce compacts with maximum strength from materials in the first group of systematization (ρ_pycn ≥ 4.64 × × 10^–3).

乌克兰国家科学院涅克拉索夫钢铁研究所的研究人员进行了旨在开发预测球团矿强度特性的分析方法的研究。这些研究利用自由流动介质内的相相互作用机制的分析来发展关于通过粘附在颗粒中形成强键的理论思想。这导致为两种基本颗粒相互作用方案建立了粘附过程的局部模型：“颗粒+颗粒”和“颗粒+液相+颗粒”。在内克拉索夫钢铁研究所的实验室进行的“颗粒+颗粒”相互作用方案的实验研究为确定由零水分细粒材料制成的球团在压实压力范围为 50 的情况下的强度特性奠定了基础。至 220 兆帕。本文的第一部分论证了研究“颗粒+液相+颗粒”相互作用方案的压坯内强键的实验的方法学先决条件。方法学先决条件考虑了造粒材料的各个颗粒之间以及电荷成分（液相）之间的机械、物理和物理化学相互作用。对实验结果的概括分析允许评估“颗粒+液相+颗粒”相互作用方案的一系列潜在粘附过程，查明它们的表现，检查它们的性质，并评估引入颗粒装料的液相的影响，考虑所施加的压实压力。本文重点介绍了“颗粒+液相+颗粒”相互作用方案的实验结果，建立了该相互作用方案中颗粒的强度特性与粘合机制的整体指标之间的分析关系（特别是堆积密度（第一组系统化材料的ρ ₀）和水分含量（W _{m ）。}此外，考虑到松散情况，在 220 MPa 压力 (P) (K _comp220 ) 下生产的压块的压实系数与材料的堆积密度 (ρ ₀）在第一批系统化中首次建立。对这些发现的分析得出了一个假设，表明引入材料中的液相（特别是水）的量应与其在压实过程中的潜在位移相平衡，以实现最大的压实强度。基于这一假设，推导出了一个新的方程来计算液体粘合剂（水）的量，以促进粘合过程的最有利条件，从而使第一组系统化材料的压块具有最大强度。实验结果与计算结果的对比分析证实了该方程的正确性。因此，提出了一种分析方法来确定从第一组系统化材料中生产具有最大强度的压块所需的炉料水分含量（ρ _pycn ≥ 4.64 × × 10 ^–3）。