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| A new mineral processing technology for refractory graphite based on flake protection |
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Received:August 14, 2025
Revised:September 26, 2025
Accepted:October 21, 2025
Published Online:April 30, 2026
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| DOI：10.3969/j.issn.1005-7854.2025.05.007 |
| KeyWord:flake graphite;mineral processing technology;flake protection;middlings treatment;luobei graphite ore |
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| 1.Heilongjiang Graphite Manufacturing Innovation Center Co, Harbin 150028, China;2.Stake Key Laboratory of Mineral Processing, BGRIMM Technology Group, Beijing 102628, China |
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| Abstract: |
| Luobei County in Heilongjiang Province is a significant production area of medium and fine flake graphite in China. This study focuses on a typical graphite ore from this region. Based on process mineralogy analysis, beneficiation experiments were conducted with the objectives of protecting graphite flakes and improving concentrate quality. In response to the characteristics of unevenly disseminated graphite particle size and high content of easily argillized gangue minerals in the ore, the roughing conditions, primary regrinding fineness, and multi-stage regrinding-cleaning process were systematically optimized. Ultimately, a closed-circuit flowsheet was established, consisting of "primary rough grinding and roughing, two stages of scavenging, eight stages of regrinding and nine stages of cleaning of the rough concentrate, combined re-cleaning and rapid rejection of low-grade middlings, and staged-return of high-grade middlings". The tests yielded a graphite concentrate with a fixed carbon content of 95.10% and a recovery of 90.20%, wherein the yield of +0.15 mm coarse flakes was 8.27%. This study can provide a technical reference for the efficient development and utilization of similar refractory graphite resources. |
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