Xinhai XHC Jaw Crusher Solves the Pain Points of Mining Crushing

The tin market has recently continued to fluctuate upwards, with prices climbing from 300,000 yuan per tonne last year to a year-to-date high of 450,000 yuan per tonne, further expanding the industry’s profit margins. This upward trend is driven by both supply and demand: on the demand side, the rapid expansion of the AI industry and the manufacture of server hardware have significantly boosted consumption of metallic tin; on the supply side, conditions remain tight, with production constraints increasing across the world’s four major tin-producing regions. Furthermore, long-term mining has led to a continuous decline in the average grade of raw ore, and new high-quality resources are becoming increasingly scarce. Against this market backdrop, improving the comprehensive recovery rate of tin resources has become a key strategy for mining companies to boost profits.

Tin ore has a complex genesis and is classified into various types, such as alluvial tin ore and vein tin ore, with a wide range of grain sizes and a multitude of associated gangue minerals. The industry has established three mainstream ore beneficiation technologies—gravity separation, flotation, magnetic separation and electrostatic separation—which are combined according to the characteristics of the ore to achieve efficient concentration of cassiterite.

Gravity separation is a time-honoured process in tin ore beneficiation, relying on the significant density difference between cassiterite and gangue to achieve separation. This process has low operating costs, requires minimal chemical reagents during production, and is environmentally friendly. It is particularly well-suited to alluvial tin ore and coarse-grained gangue-bearing tin ore, and is the preferred solution for pre-concentration operations at many tin mines. However, its shortcomings are equally pronounced: it has limited effectiveness in separating very fine-grained cassiterite, and gravity separation alone is insufficient to achieve full resource recovery.

The flotation method, on the other hand, focuses on overcoming the challenge of recovering fine- and very fine-grained cassiterite. By optimising the dosing regimes of collectors and depressants to minimise interference from gangue minerals, cassiterite can be effectively separated from silicates and calcium-bearing gangue, thereby steadily improving the grade of tin concentrate and the metal recovery rate. With the continuous evolution of green mineral processing technologies and the ongoing promotion of low-toxicity, high-efficiency flotation reagents, the environmental sustainability and economic viability of the flotation process have continued to improve, making it an indispensable core process for the recovery of complex tin ores.

Magnetic separation and electrostatic separation are generally not employed as standalone separation processes, but are mostly used in pre-treatment or enrichment stages. During operation, they effectively remove impurities such as iron minerals and sulphides from the ore, reducing interference from these impurities in subsequent separation processes, purifying the tin rough concentrate, further enhancing the quality of the final concentrate, and alleviating the burden on the smelting stage.

Nowadays, easily processable coarse-grained tin ores are becoming increasingly scarce, and mined ores generally present challenges such as complex mineral distribution, the coexistence of coarse and fine grains, and a high content of associated impurities. Simply applying standardised mineral processing flowsheets can very easily result in the loss of large quantities of fine-grained cassiterite, making it difficult to guarantee metal recovery rates. With tin prices currently at high levels, the ability of mineral processing to maximise the recovery of valuable minerals and fully utilise resources directly impacts the overall economic performance of the mine.

Xinhai Mining adheres to a ‘tailored to the ore’ design philosophy, relying on the results of process mineralogy testing to customise complete mineral processing flowsheets. By appropriately combining process units such as gravity separation, flotation and magnetic-electrostatic separation, and by optimising grinding and classification, the number of separation stages and equipment configuration, we balance concentrate grade and recovery rate. This helps mines fully realise the value of their tin ore resources and maximise profits amidst the current favourable market conditions.