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过程工程学报 ›› 2020, Vol. 20 ›› Issue (9): 1089-1096.DOI: 10.12034/j.issn.1009-606X.219347

• 过程与工艺 • 上一篇    下一篇

改善新疆某铜镍矿半自磨机顽石积累

张 谦1,3， 肖庆飞1,2,3*， 王旭东1,3， 杨 森1,3， 马 帅1,3   

  1. 1. 昆明理工大学省部共建复杂有色金属资源清洁利用国家重点实验室，云南 昆明 650093 2. 矿物加工科学与技术国家重点实验室，北京 100070 3. 昆明理工大学国土资源工程学院，云南 昆明 650093
  • 收稿日期:2019-11-14 修回日期:2020-01-03 出版日期:2020-09-22 发布日期:2020-09-23
  • 通讯作者: 肖庆飞 13515877@qq.com
  • 基金资助:
    Magnéli相亚氧化钛的可控制备、微结构与性能基础研究;矿物加工科学与技术国家重点实验室开放研究基金

Improving the accumulation of semi-autogenous grinding mill hard stones of a copper?nickel ore in Xinjiang

Qian ZHANG1,3, Qingfei XIAO1,2,3*, Xudong WANG1,3, Sen YANG1,3, Shuai MA1,3   

  1. 1. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, Yunnan 650093, China 2. State Key Laboratory of Mineral Processing Science and Technology, Beijing 100070, China 3. Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China
  • Received:2019-11-14 Revised:2020-01-03 Online:2020-09-22 Published:2020-09-23
  • Contact: Qing-Fei XIAO 13515877@qq.com

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摘要： 针对新疆某铜镍矿半自磨机顽石积累严重，磨矿产品细度不达标的问题，在测定矿石力学性质基础上，采用半自磨机磨矿循环的方法，以钢球介质配比作为单一变量，进行提高磨矿指标的磨矿对比研究，并采用离散元方法验证实验结论，最终确定半自磨机的最佳介质配比方案为?150:?120=1:2。结果表明，矿石比重平均值为3.36 g/cm3，硬度系数平均值为7.93有误单位，弹性模量平均值为3.11×104 MPa，泊松比平均值为0.26，矿石中等偏硬，伴有脆性、韧性较大的矿石存在；在相同磨矿条件下，半自磨机的推荐方案顽石25~80 mm粒级产率逐渐减少，现场方案反之。三次磨矿循环后，推荐方案较现场方案25~80 mm粒级产率低4.19个百分点，+100, ?2.5, ?0.074 mm三个粒级产率分别提高了0.25, 13.79, 4.80个百分点；与偏大方案相比，推荐方案同样表现出较好的研磨能力，在相同磨矿条件下，三次磨矿循环后顽石25~80 mm粒级产率低3.36个百分点，?0.074 mm磨矿细度高2.24个百分点。推荐方案25~80 mm粒级法向碰撞能量利用率为56.19%，较现场方案及偏大方案分别高1.82和2.30个百分点，推荐方案较其他两个方案顽石破碎能力更好，模拟仿真结果与实验结果一致。综合对比可知，推荐方案具有明显的优势，在保证磨矿产品细度维持在较好水平下，充分解决了顽石积累的问题，为相关厂矿同类问题提供可借鉴的方法。

关键词: 钢球配比, 半自磨机, 顽石积累, 磨矿产品, 细度

Abstract: Aiming at the problem that the semi-autogenous grinding mill of a copper?nickel ore in Xinjiang is seriously accumulated and the fineness of the grinding products is not up to standard, based on the determination of the mechanical properties of the ore, the fineness comparison of the semi-autogenous grinding mill grinding products was studied. In the method, the steel ball medium ratio was taken as a single variable, and the comparison test of the grinding index was carried out. The discrete element method was used to verify the laboratory test conclusions. In the end, the optimal medium ratio scheme of the semi-autogenous grinding mill was determined as follows: ?150:?120=1:2. The results showed that the average specific weight was 3.36 g/cm3, the average hardness coefficient was 7.93, the average static elastic modulus was 3.11×104 MPa, the average poisson′s ratio was 0.26, the ore was moderately hard as well as the ore with brittleness and toughness existed. Under the same grinding cycle conditions, the yield of 25~80 mm fraction of the hard stone grade gradually reduced in the recommended scheme of the semi-autogenous grinding mill. The plant scheme was reversed. After the three grinding cycles, the yield of 25~80 mm fraction of hard stone in recommended scheme was 4.19 percentage points lower than that in the plant scheme. The yield of three size fraction of +100, ?2.5 and ?0.074 mm were 0.25, 13.79 and 4.80 percentage points higher than that in the plant scheme respectively. Compared with the larger scheme, the recommended scheme showed better grinding ability as well. Under the same number of grinding cycles, the yield of 25~80 mm fraction of recommended scheme reduced by 3.36 percentage points, and the fineness of ?0.074 mm increased by 2.24 percentage points. The sum of the normal energy utilization of the recommended 25~80 mm fraction was 56.19%, which was 1.82 and 2.30 percentage points higher than the plant scheme and the larger scheme respectively. The recommended scheme showed better hard stone crushing ability. The results of the simulation tests were consistent with the laboratory test results. Based on the comparison of the test results, the recommended scheme had obvious advantages. Ensuring the fineness of the grinding products was in a good level, the accumulation of hard stones was fully solved, which provided a method to learn for a similar problem for related factories and mines.

Key words: ball ratio, semi-autogenous grinding mill, hard stone accumulation, grinding products, fineness