應用方案內蒙古包頭磁鐵礦破碎選礦技改，破碎段影響大
一、項目背景與技術挑戰
包頭磁鐵礦地處內蒙古核心礦區，礦石硬度f=12-14，磁性鐵含量35%-45%，屬于典型的中低品位磁鐵礦。原400t/h生產線長期面臨以下技術瓶頸：
破碎環節：現有設備難以適應高硬度礦石，襯板磨損快（壽命僅450小時），圓錐破主軸故障率高；
分級效率：-13mm合格粒級占比不足65%，磨礦能耗超標；
金屬回收率：整體回收率僅72%，較行業先進水平低8-10個百分點。
二、系統性改造方案
（一）破碎系統升級
粗碎工段：配置C6X145顎式破碎機
采用重型鍛造主軸（Φ220mm）
V型破碎腔設計，嚙角優化至22°
雙向液壓調整系統（調節速度3mm/s）
處理能力提升至650t/h
中細碎工段：HST250圓錐破組合
三層液壓保護系統（清腔/過鐵/過載）
主軸轉速自適應控制（200-350rpm可調）
智能襯板磨損監測（精度±2mm）
配備專用除鐵裝置（磁場強度12000Gs）
（二）分級工藝創新
預篩分系統：S5X3075-3T高頻篩
篩分效率η≥92%
采用聚氨酯篩網（壽命3000小時）
振幅/頻率在線調節
返料控制系統：
實現-20mm粒級預先分級
中碎循環負荷穩定在35%-45%
細碎閉路循環量降低28%
三、關鍵技術突破
磁鐵礦專用破碎腔型設計
破碎比優化至4.8:1
過鐵保護響應時間≤80ms
節能降耗技術
實施峰谷電價優化策略
液壓系統節能改造（節電15%）
四、運行成效與經濟指標
技術指標：
處理能力：穩定480t/h（超設計20%）
產品粒度：-13mm占比≥90%
金屬回收率：82.5%（提升10.5%）
噸礦電耗：5.8kWh（降低33%）
經濟效益：
年增鐵精粉12萬噸
設備維護成本降低210萬元/年
綜合效益提升37%
環保指標：
粉塵濃度≤8mg/m³
噪聲級≤75dB(A)
項目成果已在山西、河北等地推廣，累計創造經濟效益超3億元。下一步將開展5G+智能礦山建設，打造無人化選礦示范工程。
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Henan LIMING Heavy Industry Science and Technology Co. LTD which mainly manufacture large and medium-sized crushing and grinding equipments was founded in 1987. It is a modern joint-stock corporation with research, manufacturing and sales together. The Headquarter is located in HI-TECH Industry Development Zone of Zhengzhou and covers 80000 m ². Another workshop in Shangjie Industry Park covers 67000 m ². Over the more than 30 years, our company adheres to modern scientific management system, precision manufacturing, pioneering and innovation. Now LIMING has become the leader in domestic and oversea machinery manufacturing industry.
LIMING brings a large number of high-qualification talents together. Bai Yinghui, general research and development engineer, is a well-known expert in crushing and grinding area who won the youth medal of technology of the state council and receives special government allowance. LIMING owns an experienced service team, offering the customer free design and professional skill training and live guide for installation and debugging. The company's service networks have spread all over the country. Established client files, and mix the traditional door-to-door service with online service together, complementary the advantages. LIMING has won high recognition from clients.
The company mainly manufactures mobile crushers, stationary crushers, sand-making machines, grinding mills and complete plants that are widely used in mining, construction, highway, bridge, coal, chemical, metallurgy, refractory matter, etc. Product quality is life, and scientific innovation is motive power. LIMING got ISO international quality system certification, European Union CE certification and Russian GOST certification. The company has strong research and development strength and innovation.
LIMING machinery research institute was founded in 2005 which is the most powerful comprehensive technological research institute in the domestic mining machinery industry and provides top scientific research platform for professional personnel. Up to now, LIMING has won 10 national patents, 24 national utility model patents and 3 provincial science and technology achievement awards. The company products remain the international leading level by strengthening international exchanges and cooperation all the time, and has won a wide range of international market, such as Russian, Azerbaijan, Kazakhstan, Turkey, Kuwait, South Africa, Egypt, Vietnam, Malaysia, India, Australia, Korea, Canada and European Union,etc. Through more than 30 years' hard work, LIMING's staff built supremacy of credibility, excellent quality, service "LIMING" brand, and has made outstanding contributions to the development of mechanical manufacturing industry for China and the whole world.
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