Comminution behavior and mineral liberation characteristics of low-grade hematite ore in high pressure grinding roll

• Autorzy: Cao Jincheng , Liu Lei , Han Yuexin , Feng Ansheng

Identyfikatory

DOI

10.5277/ppmp18169

• Języki publikacji: EN

Abstrakty

EN

The comminution process and mechanism of low-grade hematite ore in a high pressure grinding roll (HPGR) were investigated in this work. Three different methods were used for comminution of the hematite ore: HPGR with an air classifier, HPGR with screening followed by ball milling (HPGR+BM), and cone crushing with screening followed by ball milling (CC+BM). In addition, the effects of comminution methods on the degree of liberation of minerals in the grinding products were compared. The results suggest that the comminution process of the ore can be divided into four stages: appearance of tiny cracks, expansion of tiny cracks, which eventually form microcosmic cracks, development of principle cracks, and generation of the conjugate fracturing zone. Intergranular cracks, including partial intergranular cracks and complete intergranular cracks, are apparent in the comminution products of the HPGR. The complete intergranular cracks mainly occur in the conjugate fracturing zone, while the partial intergranular cracks within the particles result in an abundance of locked-particles in the comminution products. Furthermore, the degree of liberation of minerals is more influenced by the final grinding mode rather than the crushing method. It is found that complete intergranular cracks in the conjugate fracturing zone play a significant role in increasing the degree of liberation of iron minerals in the fine size fraction. The “mosaic-type” locked-particles have negligible effect on the liberation properties of iron minerals during the subsequent grinding process.

Słowa kluczowe

EN

low-grade hematite ore; high pressure grinding roll; comminution behavior; degree of liberation

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2019
• Tom: Vol. 55, iss. 2
• Strony: 575--585
• Opis fizyczny: Bibliogr. 18 poz., rys., tab.

Twórcy

autor

Cao Jincheng

• College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
• Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, CAGS, Zhengzhou 450006, China
• Key Laboratory of Evaluation and Multipurpose Utilization of Polymetallic Ore of Ministry of Land and Resources, Zhengzhou 450006, China

autor

Liu Lei

• Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, CAGS, Zhengzhou 450006, China
• Key Laboratory of Evaluation and Multipurpose Utilization of Polymetallic Ore of Ministry of Land and Resources, Zhengzhou 450006, China

autor

Han Yuexin

• College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China

autor

Feng Ansheng

• Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, CAGS, Zhengzhou 450006, China
• Key Laboratory of Evaluation and Multipurpose Utilization of Polymetallic Ore of Ministry of Land and Resources, Zhengzhou 450006, China

Bibliografia

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