南芬混合铁矿石的可磨性研究与选矿工艺优化

金属矿山 ›› 2019, Vol. 48 ›› Issue (09): 71-77.

南芬混合铁矿石的可磨性研究与选矿工艺优化

刘军^1,2，牟景春³，李庚辉³，张永^1,2，张春田³

1. 中钢集团马鞍山矿山研究院有限公司，安徽马鞍山 243000；2. 华唯金属矿产资源高效循环利用国家工程研究中心有限公司，安徽马鞍山 243000；3. 本钢南芬选矿厂，辽宁本溪 117014

出版日期:2019-09-15 发布日期:2019-10-10
基金资助:
基金项目：安徽省重点研究与开发计划面上攻关项目（编号：1804a0802212）。

Study on Grindability of Mixed Iron Ore and Optimization of Mineral Processing in Nanfen

Liu Jun^1,2，Mou Jingchun³，Li Genghui³，Zhang Yong^1,2，Zhang Chuntian³

1. Sinosteel Maanshan Institute of Mining Research Co.， Ltd， Maanshan 243000， China； 2. National Engineering Research Center of Huawei High Efficiency Cyclic Utilization of Metal Mineral ResourcesCo.,Ltd.，Manshan 243000，China；3. Nanfen Concentrator of Benxi Iron and Steel Co.， Ltd， Benxi 117014， China

Online:2019-09-15 Published:2019-10-10

摘要/Abstract

摘要： 南芬选矿厂混合铁矿石选矿系统实际入选矿石与设计依据的矿石存在较大性质差异，导致半自磨机处理能力难以达到设计值、最终精矿铁品位仅达63%左右、精矿铁回收率仅达58%左右。为了解现场半自磨机处理能力低下的原因，以及现场工艺中哪些环节明显不适应入选矿石的性质，以便为工艺改造提供思路，进行了矿石磨矿特性研究和选矿工艺研究。结果表明：①矿石难磨是半自磨机处理能力低下的主要原因。②对单体解离很不充分的强磁选精矿采用螺旋溜槽重选强行抛尾是造成金属流失的重要原因。③二段球磨磨矿解离出大量的脉石和矿泥，直接进入反浮选作业严重影响反浮选的提质降杂效果是造成反浮选精矿铁品位较低的主要原因。现场根据研究成果并结合实际取消了原工艺中的螺旋溜槽重选作业，同时在二段闭路球磨磨矿作业与反浮选作业间增设弱磁选—脉动高梯度强磁选抛尾作业。改造完成后，现场生产运行平稳，生产指标显著改善，精矿铁品位提高了1.98个百分点、回收率提高了6.11个百分点。

关键词: 混合铁矿石, 弱磁选, 细筛筛分, 强磁选, 反浮选

Abstract: The actual selected ore in mixed iron ore beneficiation system of Nanfen concentrator is greatly different in property aspect from the ore which is used for design， resulting in the difficult to reach the design value and a final iron concentrate with iron grade of only about 63% and iron recovery of only about 58%. In order to understand the causes for low throughput of the semi-automatic grinding mill and find out the links in the site process which is obviously not suitable for the properties of the selected ore， the ore grinding characteristics and beneficiation process were studied to provide ideas for process transformation. The results indicated that:①The ore is difficult to be ground， which is the main cause for the low throughput of the semi-automatic grinding mill； ②The insufficiently liberated high-magnetic separation concentrate was forced to discard tailing using spiral sluice gravity-separation， which is the major cause for metal loss； ③Large amounts of gangue and slime liberated from the second stage ball grinding and directly entered the reverse flotation， thus seriously affected the quality improvement and impurity reduction of the reverse flotation， which was the main cause for the low iron grade of the reverse flotation concentrate. On the basis of the research results and combining the reality， the gravity separation by spiral sluice in the original process was canceled on site. Meanwhile， a tailing discarding operation by low intensity magnetic separation and pulsating high gradient high intensity magnetic separation was added between the second stage closed-circuit ball grinding and the reverse flotation. After the process transformation， the site production runs smoothly and the production indexes improves significantly with the concentrate iron grade increasing by 1.98 percentage points and the recovery rate increasing by 6.11 percentage points.

Key words: Mixed iron ore, Low intensity magnetic separation, fine screen screening, High intensity magnetic separation, Reverse flotation

刘军, 牟景春, 李庚辉, 张永, 张春田. 南芬混合铁矿石的可磨性研究与选矿工艺优化[J]. 金属矿山, 2019, 48(09): 71-77.

LIU Jun, MOU Jing-Chun, LI Geng-Hui, ZHANG Yong, ZHANG Chun-Tian. Study on Grindability of Mixed Iron Ore and Optimization of Mineral Processing in Nanfen[J]. Metal Mine, 2019, 48(09): 71-77.

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