磁力旋流器脫泥濃縮規(guī)律研究
發(fā)布時(shí)間：2018-07-20 19:10
【摘要】：鐵礦石是鋼鐵工業(yè)的主要原料。煉鐵工業(yè)要求較高的鐵精礦品位，國(guó)內(nèi)外鐵精礦生產(chǎn)發(fā)展趨勢(shì)主要有三個(gè)方面，即新型高效磁選設(shè)備、反浮選工藝以及磁選和反浮選聯(lián)合流程。在磁鐵礦選礦過程中，大量細(xì)泥的存在對(duì)選別過程和精礦產(chǎn)品的質(zhì)量有重大影響，為給選別過程創(chuàng)造有利條件，得到合格的精礦，通常要對(duì)物料進(jìn)行入選前的脫泥作業(yè)。因此，本論文設(shè)計(jì)、使用磁力旋流器對(duì)磁鐵礦進(jìn)行脫泥濃縮試驗(yàn)研究，以達(dá)到脫除細(xì)泥“提鐵降硅”的目的。 設(shè)計(jì)并加工Φ100mm磁力旋流器，構(gòu)建試驗(yàn)系統(tǒng)，研究了旋流器錐角、磁場(chǎng)位置和大小、組合磁場(chǎng)、入料壓力和濃度等對(duì)磁力旋流器脫泥濃縮效果的影響。 90°錐角下磁場(chǎng)作用在錐中時(shí)，在單線圈作用下得到了產(chǎn)率82.20%、鐵品位61.49%、SiO2含量10.75%的底流產(chǎn)品；采用雙線圈增大磁場(chǎng)強(qiáng)度和磁場(chǎng)作用空間，可使底流鐵回收率達(dá)到98.96%，底流品位從57.95%提高到60.36%，進(jìn)一步降低溢流中金屬損失，達(dá)到了脫除部分細(xì)泥，提高底流品位的目的，可使礦漿濃度從15%濃縮至48.83%，降低后續(xù)選別作業(yè)的處理量。磁力旋流器對(duì)較細(xì)粒級(jí)磁鐵礦物料脫泥效果明顯，對(duì)粗粒級(jí)物料分選效果不明顯，將粗粒級(jí)預(yù)先去除有利于提高底流產(chǎn)品的鐵精礦品位。 20°錐角下多線圈磁場(chǎng)作用在錐中位置時(shí)效果較好，較小電流時(shí)底流產(chǎn)率即可達(dá)到90.91%，金屬損失很少；單線圈作用下，隨著電流的增大，底流產(chǎn)率隨之增大，溢流和側(cè)溢流產(chǎn)率都隨之減小，0.08MPa壓力時(shí)，隨著電流的增大，底流產(chǎn)率從67.49%升至90.37%，溢流產(chǎn)率從28.86%降至8.35%，側(cè)溢流產(chǎn)率從3.65%降至1.28%，較低的壓力有利于減少金屬損失；隨著入料濃度的增大，底流產(chǎn)率減小，高濃度下增大了金屬的損失，15%質(zhì)量濃度效果較好。 在溢流室施加磁場(chǎng)，永磁場(chǎng)作用下未能實(shí)現(xiàn)進(jìn)一步回收金屬的目的；電磁場(chǎng)作用下可以不同程度地增加底流和側(cè)溢流產(chǎn)率，降低溢流產(chǎn)率，減少金屬損失；在錐體中部和溢流室同時(shí)施加磁場(chǎng)，可強(qiáng)化底流的金屬回收，但對(duì)側(cè)溢流進(jìn)一步回收基本無效。 采用ANSYS有限元分析軟件的磁場(chǎng)分析功能，對(duì)所用磁系進(jìn)行了模擬。模擬結(jié)果表明：由ANSYS模擬得到的線圈中心軸線上的磁感應(yīng)強(qiáng)度變化與實(shí)際測(cè)量值規(guī)律一致，吻合度較高，可以較真實(shí)的反應(yīng)磁場(chǎng)特性。線圈通電后軸向和徑向上均有磁場(chǎng)力的存在，線圈上下平面附近磁場(chǎng)梯度較大，磁場(chǎng)力也相應(yīng)較大，，可以吸引磁性顆粒向該區(qū)域聚積；越靠近線圈內(nèi)壁磁場(chǎng)梯度越大，磁性顆粒在徑向上受到的磁場(chǎng)力指向外部，可以強(qiáng)化其向外旋流的運(yùn)動(dòng)。 磁力旋流器對(duì)磁鐵礦具有一定的脫泥作用，可提高磁鐵礦精礦品位，是一個(gè)良好的磁力濃縮設(shè)備。
[Abstract]:Iron ore is the main raw material of iron and steel industry. The development trend of iron concentrate production at home and abroad mainly includes three aspects: new high efficiency magnetic separation equipment reverse flotation process and combined process of magnetic separation and reverse flotation. In the process of magnetite processing, the existence of a large amount of fine mud has a significant impact on the separation process and the quality of concentrate products. In order to create favorable conditions for the separation process and to obtain qualified concentrate, the material usually needs to be deslimed before being selected. Therefore, in this paper, the magnetic cyclone is used to study the desliming and concentration of magnetite in order to remove the fine mud from iron and silicon. The 桅 100mm magnetic hydrocyclone is designed and fabricated. The test system is constructed. The cone angle, magnetic field position and size, combined magnetic field are studied. The effect of feed pressure and concentration on the desliming effect of magnetic hydrocyclone. When the magnetic field is in the cone at 90 擄angle, the bottom flow product with the yield of 82.20 and the iron grade of 61.49SiO2 10.75% is obtained under the action of single coil. Using double coils to increase magnetic field intensity and magnetic field action space, the recovery rate of bottom flow iron can reach 98.96 and the bottom flow grade will be raised from 57.95% to 60.36. The loss of metal in overflow can be further reduced, and the purpose of removing some fine mud and improving bottom flow grade can be achieved. The pulp concentration can be concentrated from 15% to 48.83%, and the treatment capacity of subsequent separation operation can be reduced. The effect of magnetic cyclone on desliming of fine grained magnetite is obvious, but it is not obvious for coarse grained material. The iron concentrate grade can be improved by removing coarse-grained grade in advance. Under 20 擄cone angle, the effect of multi-coil magnetic field in the cone is better, the bottom flow rate can reach 90.91 when the current is small, and the loss of metal is very little. Under the action of single coil, the bottom flow rate increases with the increase of current. When the overflow rate and side overflow rate decrease with 0.08MPa pressure, the flow rate increases with the increase of current. The bottom abortion rate increased from 67.49% to 90.37%, the overflow rate decreased from 28.86% to 8.35, and the side discharge rate decreased from 3.65% to 1.28%. At high concentration, the loss of metal is increased by 15% mass concentration. When the magnetic field is applied in the overflow chamber, the purpose of further recovery of metal can not be realized under the action of permanent magnetic field, and the bottom current and side overflow rate can be increased, the overflow rate and metal loss can be reduced in varying degrees under the action of electromagnetic field. When the magnetic field is applied simultaneously in the middle of cone and overflow chamber, the metal recovery of bottom flow can be enhanced, but the further recovery of contralateral overflow is basically ineffective. The magnetic field analysis function of ANSYS finite element analysis software is used to simulate the magnetic system. The simulation results show that the variation of magnetic induction intensity on the central axis of the coil obtained by ANSYS is consistent with the measured values, and the degree of coincidence is high, and the real response magnetic field characteristics can be obtained. The magnetic field force exists in the axial and radial direction after the coil is electrified. The magnetic field gradient near the upper and lower plane of the coil is larger, and the magnetic field force is also larger, which can attract the magnetic particles to accumulate in this region. The closer the magnetic field gradient is to the inner wall of the coil, the greater the magnetic field gradient is. The magnetic force acting on the magnetic particles in the radial direction points to the outside, which can strengthen the motion of the outward swirling flow. Magnetic cyclone has a certain desilting effect on magnetite, it can improve the grade of magnetite concentrate, and it is a good equipment for magnetic concentration.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD457;TD951
本文編號(hào)：2134484
[Abstract]:Iron ore is the main raw material of iron and steel industry. The development trend of iron concentrate production at home and abroad mainly includes three aspects: new high efficiency magnetic separation equipment reverse flotation process and combined process of magnetic separation and reverse flotation. In the process of magnetite processing, the existence of a large amount of fine mud has a significant impact on the separation process and the quality of concentrate products. In order to create favorable conditions for the separation process and to obtain qualified concentrate, the material usually needs to be deslimed before being selected. Therefore, in this paper, the magnetic cyclone is used to study the desliming and concentration of magnetite in order to remove the fine mud from iron and silicon. The 桅 100mm magnetic hydrocyclone is designed and fabricated. The test system is constructed. The cone angle, magnetic field position and size, combined magnetic field are studied. The effect of feed pressure and concentration on the desliming effect of magnetic hydrocyclone. When the magnetic field is in the cone at 90 擄angle, the bottom flow product with the yield of 82.20 and the iron grade of 61.49SiO2 10.75% is obtained under the action of single coil. Using double coils to increase magnetic field intensity and magnetic field action space, the recovery rate of bottom flow iron can reach 98.96 and the bottom flow grade will be raised from 57.95% to 60.36. The loss of metal in overflow can be further reduced, and the purpose of removing some fine mud and improving bottom flow grade can be achieved. The pulp concentration can be concentrated from 15% to 48.83%, and the treatment capacity of subsequent separation operation can be reduced. The effect of magnetic cyclone on desliming of fine grained magnetite is obvious, but it is not obvious for coarse grained material. The iron concentrate grade can be improved by removing coarse-grained grade in advance. Under 20 擄cone angle, the effect of multi-coil magnetic field in the cone is better, the bottom flow rate can reach 90.91 when the current is small, and the loss of metal is very little. Under the action of single coil, the bottom flow rate increases with the increase of current. When the overflow rate and side overflow rate decrease with 0.08MPa pressure, the flow rate increases with the increase of current. The bottom abortion rate increased from 67.49% to 90.37%, the overflow rate decreased from 28.86% to 8.35, and the side discharge rate decreased from 3.65% to 1.28%. At high concentration, the loss of metal is increased by 15% mass concentration. When the magnetic field is applied in the overflow chamber, the purpose of further recovery of metal can not be realized under the action of permanent magnetic field, and the bottom current and side overflow rate can be increased, the overflow rate and metal loss can be reduced in varying degrees under the action of electromagnetic field. When the magnetic field is applied simultaneously in the middle of cone and overflow chamber, the metal recovery of bottom flow can be enhanced, but the further recovery of contralateral overflow is basically ineffective. The magnetic field analysis function of ANSYS finite element analysis software is used to simulate the magnetic system. The simulation results show that the variation of magnetic induction intensity on the central axis of the coil obtained by ANSYS is consistent with the measured values, and the degree of coincidence is high, and the real response magnetic field characteristics can be obtained. The magnetic field force exists in the axial and radial direction after the coil is electrified. The magnetic field gradient near the upper and lower plane of the coil is larger, and the magnetic field force is also larger, which can attract the magnetic particles to accumulate in this region. The closer the magnetic field gradient is to the inner wall of the coil, the greater the magnetic field gradient is. The magnetic force acting on the magnetic particles in the radial direction points to the outside, which can strengthen the motion of the outward swirling flow. Magnetic cyclone has a certain desilting effect on magnetite, it can improve the grade of magnetite concentrate, and it is a good equipment for magnetic concentration.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD457;TD951
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