Application of a new type of SLon-2500TP magnetic separator for raising ilmenite recovery
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摘要: 攀钢兴茂公司采用两段强磁选和浮选精选的流程，从攀钢密地选钛厂排往尾矿库的尾矿中再回收钛铁矿，针对其选钛流程中二段强磁选TiO2作业回收率偏低的问题，研制了新型SLon-2500TP立环脉动高梯度磁选机。该机用于二段强磁选运行7个多月选钛平均指标为：给矿TiO2品位13.19%，精矿TiO2品位17.71%，尾矿TiO2品位5.34%，TiO2作业回收率85.21%。与并列的Φ2500立环强磁选机前期一年多的选钛平均指标比较，TiO2作业回收率提高15个百分点左右，与同期平行取样的平均选钛指标比较，TiO2作业回收率提高26.82个百分点。该机在工业上的成功应用，为提高选钛技术水平做出了积极的贡献。
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关键词:
- 钛铁矿 /
- 选矿 /
- SLon-2500TP立环脉动高梯度磁选机 /
- 回收率
Abstract: Pangang Xingmao Company scavenges ilmenite from the discharging tails of Pangang Midi ilmenite concentrator. The flowsheet consists of two stages of high-intensity magnetic separation and flotation concentration. In order to solve the problem of lower TiO2 recovery in the second stage of high-intensity magnetic separation, a new type of SLon-2500TP vertical ring and pulsating high-gradient magnetic separator was developed. The average results of its 7 months operation are as follows: feed grade 13.19% TiO2, concentrate grade 17.71% TiO2, tails grade 5.34% TiO2, and TiO2 recovery 85.21%. Compared with the average results of previous (more than one year) parallel Φ2500 vertical ring high-intensity magnetic separator, the TiO2 recovery is increased by about 15%. Compared with the parallel average results of the same time, the TiO2 recovery is increased by 26.82%. Its successful commercial application will advance the development of ilmenite beneficiation technology. -
图 1 攀钢密地选钛厂总尾矿强磁选钛数质量原则流程
Figure 1. Flow chart of quantity and quality of titanium selection from the discharging tails of Pangang Midi plant
图 2 第一台SLon-4000磁选机选钛工业试验流程
Figure 2. Industrial test process for titanium separation by the first SLon-4000 magnetic separator
图 4 现场二段强磁给矿实验室试验结果
Figure 4. Laboratory test results of the two-stage high-intensity magnetic feeding
表 1 攀钢兴茂公司选钛厂近年生产指标
Table 1. Production index of titanium separation in Pangang Xingmao company
年份 钛精矿产量/万t 钛精矿TiO2品位/% 产值/万元 2014 14.10 46.78 16 920 2015 12.20 47.68 14 640 2016 13.09 47.53 15 708 2017 16.50 47.42 19 800 2018 19 47.40 22 800 2019 22 47.40 26400 小计 96.89 47.37 116 268 注：表中钛精矿价格按1 200元/t不变价计算。 
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表 2 兴茂选钛流程可行性研究钛精矿产量预测
Table 2. Production forecast of titanium concentrate by feasibility study of titanium selection in Xingmao
尾矿处理量/
（万t·a−1）强磁给矿TiO2
品位/%强磁TiO2
回收率/%浮选作业TiO2
回收率/%钛精矿年产
量/（万t·a−1）700 6.80 54.00 75 34.72 700 6.50 51.00 75 31.34 700 6.20 48.00 75 28.12 注：1) 表中钛精矿品位假定为47.2%TiO2; 2) 假定生产上因脱水、检修停产等损失15%金属量；3) 强磁回收率指一段强磁选和二段强磁选综合回收率。
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表 3 SLon-4000立环脉动高梯度磁选机工业试验指标
Table 3. Beneficiation index of SLon-4000 vertical ring magnetic separator
处理量/
[t·(台·h）−1]给矿TiO2
品位/%精矿TiO2
品位/%尾矿TiO2
品位/%精矿
产率/%作业回
收率/%230 6.22 12.04 3.29 33.49 64.82 460 6.35 13.44 3.35 29.73 62.93 610 6.42 13.75 3.84 26.03 55.75 690 6.64 14.28 4.06 25.24 54.29
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表 4 二段强磁选Φ2500立环强磁选机考察指标
Table 4. Beneficiation index of Φ2500 high gradient magnetic separator
给矿TiO2
品位/%精矿TiO2/
%尾矿TiO2
品位/%精矿产
率/%作业回收
率/%12.11 16.51 7.47 51.33 69.98
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表 5 SLon-2500TP磁选机合同指标
Table 5. Contract indicators of SLon-2500TP magnetic separator
处理量/
[t·（台·h）−1]给矿TiO2
品位/%精矿TiO2
品位/%尾矿TiO2
品位/%作业回
收率/%≥80 10.5～11.5 ≥15 ≤5.6 ≥75
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表 6 SLon-2500TP磁选机生产考察指标
Table 6. Beneficiation index of SLon-2500TP magnetic separator
给矿TiO2
品位/%精矿TiO2
品位/%尾矿TiO2
品位/%精矿产
率/%TiO2回收
率/%13.19 17.71 5.34 63.46 85.21
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表 7 SLon-2500TP磁选机与Φ2500立环强磁选机对比指标
Table 7. Index comparison of SLon-2500TP magnetic separator and Φ2500 high-intensity separator
设备 给矿TiO2品位/% 精矿TiO2品位/% 尾矿TiO2品位/% 精矿产率/% 作业回收率/% SLon-2500TP磁选机 13.44 18.33 5.47 61.98 84.52 Φ2500立环强磁选机 13.61 18.90 9.85 41.55 57.70 差值 −0.17 −0.57 −4.38 +20.43 +26.82
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表 8 SLon-2500TP磁选机磁感强度与选矿指标的关系
Table 8. Relationship between magnetic induction and beneficiation index of SLon-2500TP magnetic separator
激磁电流/A 背景磁感强度/T 给矿TiO2品位/% 精矿TiO2品位/% 尾矿TiO2品位/% 精矿产率/% 作业回收率/% 700 0.544 13.08 18.29 5.56 59.07 82.60 800 0.606 13.45 19.38 5.42 57.52 82.88 900 0.687 13.28 17.10 5.39 67.38 86.76 1100 0.791 12.54 16.15 4.97 67.71 87.20
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表 9 SLon-2500TP磁选机精矿品位与回收率的关系
Table 9. Relationship between concentrate grade and recovery rate of SLon-2500TP magnetic separator
精矿TiO2品位范围/% 给矿TiO2品位/% 精矿TiO2品位/% 尾矿TiO2品位/% 精矿产率/% 作业回收率/% 15～16 12.75 15.67 5.02 72.58 89.20 16～17 13.08 16.49 5.12 70.01 88.26 17～18 12.89 17.55 5.30 61.96 84.36 18～19 13.33 18.48 5.83 59.29 82.19 19～20 13.41 19.34 5.47 57.25 82.56 20～21 14.27 20.50 5.51 58.44 83.95
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表 10 SLon-2500TP磁选机给矿品位与选矿指标的关系
Table 10. Relationship between feed grade and beneficiation index of SLon-2500TP magnetic separator
给矿TiO2品位范围/% 给矿TiO2品位/% 精矿TiO2品位/% 尾矿TiO2品位/% 精矿产率/% 作业回收率/% ≤12.5 12.10 16.93 4.86 59.98 83.93 12.5～13 12.84 17.19 5.50 62.79 84.06 13～13.5 13.32 18.36 5.43 61.32 84.11 13.5～14 13.72 17.51 5.28 69.01 88.07 ≥14 14.66 18.50 5.48 70.51 88.98
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[1] Xiong Dahe. Review and prospect of SLon magnetic separators on raising ilmenite recovery[J]. Metal Mine, 2011,(10):1−8. (熊大和. 应用SLon磁选机提高选钛回收率的回顾与展望[J]. 金属矿山, 2011,(10):1−8. [2] Xie Qichun. Reclaiming ilmenite from titanium tallings of Panxi area: Technical study and commercial application[J]. Mining and Metallurgical Engineering, 2018,38(3):40−42. (谢琪春. 攀西选钛尾矿中再回收钛铁矿工艺研究与应用[J]. 矿冶工程, 2018,38(3):40−42. doi: 10.3969/j.issn.0253-6099.2018.03.009 [3] Xiong Dahe. Development and application of SLon-2500 vetical ring and pulsating high grsdientmagnetic separator[J]. Metal Mine, 2010,(6):133−136. (熊大和. SLon-2500立环脉动高梯度磁选机的研制与应用[J]. 金属矿山, 2010,(6):133−136. -
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