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內(nèi)蒙古磁鐵礦破碎選礦技改,內(nèi)蒙古鐵礦石加工
來自內(nèi)蒙古一家大型礦業(yè)集團,該集團在包頭、巴彥淖爾市分別新建了400t/h、500t/h、1000t/h磁鐵礦破碎選礦生產(chǎn)線,基于對世邦品牌的認同,該集團三條生產(chǎn)線設備全部選擇了世邦集團。
400t/h磁鐵礦破碎選礦項目升級改造
該客戶基于歷史原因,在包頭的400t/h生產(chǎn)線建設之時曾嘗試過各種廠家的各種破碎設備,哪怕是國際知名品牌,但效果卻遠遠達不到預期,這讓客戶既疑惑又苦惱。
2020年8月,客戶既有生產(chǎn)線因工藝設計問題,出現(xiàn)三段破碎作業(yè)不甚匹配,顎破、圓錐破單機更是時而出現(xiàn)機械故障,加之廠家售后服務不到位,嚴重影響生產(chǎn)線的穩(wěn)定運行,后該公司致電世邦,希望能對其400t/h磁鐵礦生產(chǎn)線進行技術診斷、升級改造。
世邦經(jīng)實地勘察,詳細了解生產(chǎn)線設備的運行情況,技術工程師為客戶制定了全方位系統(tǒng)升級改造方案。
改造后,粗碎階段使用PEW860歐版顎破替代了原有顎破,解決了粗碎原有的卡料問題,后又增加了HST250圓錐破替代原有單缸液壓圓錐破,從而提高了中碎的破碎比,進而減輕了細碎壓力和篩分作業(yè)壓力,優(yōu)化了生產(chǎn)線的破碎比分配。
改造后的生產(chǎn)線運行穩(wěn)定,降低了成品粒度,減輕了篩分壓力,持續(xù)好的產(chǎn)出。
一、原料特性與加工難點分析
原料特征:
主要類型:磁鐵礦(Fe3O4)、赤鐵礦(Fe2O3)、褐鐵礦(2Fe2O3·3H2O)
典型成分:TFe 30-65%,SiO2 5-35%,Al2O3 1-8%
物理特性:普氏硬度f=12-16,堆積密度2.5 3.5t/m³
核心加工難題:
嵌布粒度不均:0.02-5mm不等
礦物解離困難:與石英等脈石緊密共生
設備磨損嚴重:襯板壽命僅300-800小時
能耗瓶頸:破碎能耗占全流程35-50%
二、現(xiàn)代化加工工藝流程
破碎篩分系統(tǒng)
(1)三段一閉路流程:
粗碎:顎式破碎機(入料≤1000mm,出料≤250mm)
中碎:單缸液壓圓錐破(出料≤60mm)
細碎:多缸液壓圓錐破(出料≤12mm)
篩分:多層重型振動篩(篩分效率≥90%)
(2)關鍵技術參數(shù):
總破碎比控制在30-50:1
循環(huán)負荷率35-45%
設備作業(yè)率≥92%
磨礦分級系統(tǒng)
一段磨礦:溢流型球磨機+螺旋分級機
二段磨礦:格子型球磨機+水力旋流器
技術指標:
磨礦細度-200目≥85%
分級效率η≥65%
噸礦電耗18-22kWh
選礦系統(tǒng)優(yōu)化
(1)磁鐵礦選別:
弱磁選:磁選機場強1200-1500Gs
精選:高頻振動細篩(篩孔0.1mm)
掃選:梯度磁場磁選機
(2)赤鐵礦選別:
強磁選:1.0-1.2T高梯度磁選
浮選:陰離子反浮選(pH=11-12)
重選:螺旋溜槽+搖床組合
三、技術創(chuàng)新方向
好的破碎裝備
超重型顎破(900×1200mm以上)
智能圓錐破(液壓+電控雙調(diào)節(jié))
預選拋廢技術
干式磁滑輪預選(拋廢率15-25%)
智能化控制系統(tǒng)
在線粒度分析儀(測量誤差≤3%)
專家優(yōu)化控制系統(tǒng)(產(chǎn)能提升8-12%)
數(shù)字孿生平臺(故障預警準確率85%)
四、經(jīng)濟效益分析
典型選礦廠指標:
處理規(guī)模:200萬噸/年
精礦品位:65±1%TFe
金屬回收率:磁鐵礦82-88%,赤鐵礦75-80%
加工成本:120-180元/噸原礦
成本構(gòu)成:
破碎篩分:18-25%
磨礦分級:35-45%
選別作業(yè):15-20%
尾礦處理:10-15%
節(jié)能降耗措施:
多碎少磨工藝(節(jié)電15-20%)
高頻篩取代螺旋分級機(效率提升30%)
尾礦干排技術(回水率≥90%)
五、發(fā)展趨勢展望
短流程工藝:
超細碎+粗粒拋尾
綠色礦山建設:
粉塵濃度≤10mg/m³
噪聲控制≤80dB(A)
廢水零排放系統(tǒng)
本報告基于國內(nèi)30個典型鐵礦石選礦廠運行數(shù)據(jù),各項技術指標均經(jīng)過工業(yè)驗證。最新實踐表明,采用現(xiàn)代加工技術可使鐵精礦綜合成本降低15-25%,資源利用率提高8-12個百分點。建議新建項目優(yōu)先考慮短流程方案,改造項目重點優(yōu)化破碎篩分和預選拋廢環(huán)節(jié)。
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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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