【摘要】：鋼鐵是國民經(jīng)濟的基礎(chǔ),鋼鐵產(chǎn)量是衡量一個國家工業(yè)發(fā)展程度的主要標志。冶煉鋼鐵離不開選礦,選礦廠鐵精粉的質(zhì)量和產(chǎn)量是決定鋼鐵產(chǎn)量的決定性因素。沒有足夠的鐵精粉,不可能煉出大量的鋼鐵。生產(chǎn)出的鐵精粉礦漿的品位太低,就會造成大量的產(chǎn)品不合格；礦漿產(chǎn)品的品位太高,選出的產(chǎn)品數(shù)量太少,又會使產(chǎn)量大大降低。所以關(guān)鍵位置全鐵品位的監(jiān)測至關(guān)重要。選礦廠生產(chǎn)過程礦漿的鐵品位是選礦工藝中需要控制的主要技術(shù)參數(shù)。 射線檢測技術(shù)在進行物質(zhì)組分分析中具有其獨特的優(yōu)勢,在工作中嘗試采用雙能量Y射線吸收技術(shù)進行鐵礦漿品位在線分析。首先,通過理論分析研究射線與物質(zhì)之間的相互作用,建立鐵礦漿品位測量的數(shù)學模型,設(shè)計出合適測量的測量裝置。然后,將品位儀應用于工業(yè)現(xiàn)場進行標定,得到大量的基礎(chǔ)數(shù)據(jù),對數(shù)據(jù)進行深入分析,找出規(guī)律,總結(jié)出適合現(xiàn)場應用的標定方法。最后,對品位儀的現(xiàn)場應用情況進行總結(jié),針對儀表存在的問題進行完善和升級,提高品位儀適應現(xiàn)場的能力。通過對品位儀的現(xiàn)場標定,其對鐵品位的檢測精度達到±0.5%(1δ),可滿足于選礦廠對礦漿品位的精度要求；通過對大量的現(xiàn)場數(shù)據(jù)進行分析,總結(jié)出一套適合現(xiàn)場的標定技巧,使現(xiàn)場調(diào)試標定更加簡單,維護更加方便；通過對品位儀的完善和升級,品位儀的適應性得到了大幅度提升,可以適應不同的選礦工藝,為實時調(diào)節(jié)生產(chǎn)提供依據(jù)。 經(jīng)過不斷的改進和完善,礦漿品位儀已經(jīng)從實驗產(chǎn)品發(fā)展成為用戶可信賴的產(chǎn)品。礦漿品位儀能夠滿足選礦行業(yè)的需要,解決了其在生產(chǎn)過程中遇到的鐵品位化驗結(jié)果不及時的實際難題。同時也是一款具有自主知識產(chǎn)權(quán),價格適中的在線品位分析儀器,利于在選礦廠進行推廣。目前品位儀還沒有與選礦自動化相結(jié)合,參與自動控制,隨著礦山自動化的不斷發(fā)展和礦漿品位儀的不斷完善升級,品位儀參與選礦廠閉環(huán)控制這個目標一定可以實現(xiàn)。
[Abstract]:Iron and steel is the basis of national economy, and the output of iron and steel is the main symbol to measure the degree of industrial development of a country. The quality and output of fine iron powder in concentrator are the decisive factors to determine the output of iron and steel. Without enough iron powder, it is impossible to produce a great deal of steel. If the grade of the iron concentrate pulp produced is too low, a large number of products will not be qualified, the grade of the pulp product is too high, the quantity of the selected product is too little, and the output will be greatly reduced. Therefore, the monitoring of all-iron grade at the key position is very important. The iron grade of ore pulp in the production process of concentrator is the main technical parameter which needs to be controlled in the process of mineral processing. X-ray detection technology has its unique advantages in material composition analysis. In the work, dual-energy Y-ray absorption technique is used for on-line grade analysis of iron ore slurry. Firstly, through the theoretical analysis of the interaction between ray and matter, the mathematical model of grade measurement of iron ore slurry is established, and a suitable measuring device is designed. Then, the product level meter is used to calibrate the industrial site, and a large number of basic data are obtained. The data is analyzed deeply, the rule is found out, and the calibration method suitable for the field application is summarized. Finally, the field application of the level meter is summarized, and the problems existing in the meter are improved and upgraded, so as to improve the adaptability of the level meter to the field. The precision of iron grade detection is 鹵0.5% (1 未), which can meet the precision requirement of ore pulp grade in concentrator by calibrating the grade meter on the spot. The precision of the grade of iron is up to 鹵0.5% (1 未). Through the analysis of a large number of field data, a set of calibration techniques suitable for the site is summarized, which makes the field debugging and calibration simpler and the maintenance more convenient. Through the improvement and upgrading of the product level meter, the adaptability of the product level meter has been greatly improved, which can adapt to different mineral processing processes and provide the basis for real-time adjustment of production. After continuous improvement and perfection, pulp level meter has been developed from experimental products to reliable products. The pulp level meter can meet the needs of mineral processing industry and solve the practical problem that the iron grade test results encountered in the production process are not timely. At the same time, it is also an on-line grade analysis instrument with independent intellectual property right and moderate price, which is beneficial to popularize in concentrator. At present, the grade meter has not been combined with mineral processing automation to participate in automatic control. With the continuous development of mine automation and the continuous improvement and upgrading of pulp level meter, the goal of grade meter participating in closed-loop control of concentrator can be achieved.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TD463;TD928.9

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