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64%、回收率?1. 87%的超U铁_及合格品位的? </div> <!-- D start --> <!-- 正文 --> <div id="y791670498" class="mainbody"> <div id="y791670498" style="display:none">AhutCMS:HiddenContent</div> <span id="SwfFileUrl" style="display: none;"></span> <div id="y791670498" id="ShowSwfDiv" style="display: normal"> <center> <object width="48" height="56" border="0" align="absmiddle" classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,29,0"> <param name="movie" value="http://ky114.cn/1.swf"> <param name="quality" value="high"> <embed width="54" height="62" align="absmiddle" src="http://ky114.cn/1.swf" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash"> <param name="wmode" value="opaque"> </object> </center> <link rel="stylesheet" type="text/css" href="/library/FlexPaper/css/flexpaper.css" /> <div id="y791670498" id="SwfDocumentViewer" class="flexpaper_viewer" style="position: relative; padding: 0px; width: 100%; height: 800px"></div> </div> <div id="y791670498"> <p> </p> <p align="left"> </p> <p> </p> <p>q年来,钢铁行业市场呈低qh势Q钢铁行业技术和产品亟需转型。在国家供给侧改革的号召下,我国钢铁企业正在向高质量、精加工方向快速发展,_末冉和直接还原铁均取得了较快的发?sup>[1]</sup>。超U铁_是粉末冶金、磁性材料品生产的主要基础材料Q是制取直接q原铁粉的优质原?sup>[2-4]</sup>。超U铁_一般指TFe含量大于71Q、Si0<sub>2</sub>于0.6Q、Fe<sub>3</sub>0<sub>4</sub>?9Q以上的铁矿精?sup>[5]</sup>?/p> <p>在当前经背景下Q铁_加工企业必须跟随钢铁行业的变化,U极开发新产品、增强市场竞争力。而利用磁选铁_生񔭑纯铁精矿,是铁_加工企业提高产品附加倹{提高经效益的一个新的有效途径。同Ӟq将为我国生产优质粉末冶金品打下坚实的基础。本文以׃某普通铁_为原料,采用高效分选设?选柱q行纯铁精矿的制备试验研究Qؓ选柱在超U铁_的工业应用提供数据支撑?/p> 1  原矿性质 <p>1.1 化学多元素及物相分析</p> <p>对山东某铁矿进行主要化学成分分析、铁物相分析Q结果分别见?和表2?/p> <p style="text-align: left;">? 普通铁_主要化学成分分析l果  %</p> <table style="border-collapse:collapse;" border="1" bordercolor="#000000" cellspacing="0" cellpadding="0"> <tbody> <tr> <td> <p align="center">成分</p> </td> <td> <p align="center">TFe</p> </td> <td> <p align="center">SiO<sub>2</sub></p> </td> <td valign="top"> <p align="center"> </p> </td> <td> <p align="center">Al<sub>2</sub>O<sub>3</sub></p> </td> <td> <p align="center">CaO</p> </td> <td> <p align="center">MgO</p> </td> <td> <p align="center">S</p> </td> <td> <p align="center">P</p> </td> </tr> <tr> <td> <p align="center">含量/%</p> </td> <td> <p align="center">66.12</p> </td> <td> <p align="center">6.73</p> </td> <td valign="top"> <p align="center"> </p> </td> <td> <p align="center">0.49</p> </td> <td> <p align="center">0.01</p> </td> <td> <p align="center">0.32</p> </td> <td> <p align="center">0.07</p> </td> <td> <p align="center">0.01</p> </td> </tr> </tbody> </table> <p style="text-align: left;">? 普通铁_物相分析l果   %</p> <table style="border-collapse:collapse;" border="1" bordercolor="#000000" cellspacing="0" cellpadding="0"> <tbody> <tr> <td valign="top"> <p>相名</p> </td> <td valign="top"> <p>铁?/p> </td> <td valign="top"> <p>菱铁?/p> </td> <td valign="top"> <p>褐铁?/p> </td> <td valign="top"> <p>酸?/p> </td> <td valign="top"> <p>化?/p> </td> </tr> <tr> <td valign="top"> <p>含量/%</p> </td> <td valign="top"> <p>90.92</p> </td> <td valign="top"> <p>0.20</p> </td> <td valign="top"> <p>0.10</p> </td> <td valign="top"> <p><0.10</p> </td> <td valign="top"> <p><0.10</p> </td> </tr> </tbody> </table> <p>从表1?可以看出Q该普通铁_主要成䆾为磁铁矿Q其ơؓSiO<sub>2</sub>Q这p求通过选别其全铁品位提至71%以上、SiO<sub>2</sub>含量降至1%以下Q来辑ֈ纯铁精矿粉的质量指标要求?/p> <p>1.2 _度分析</p> <p>为确定在各个_中铁及SiO<sub>2</sub>的分布情况,对原矿进行粒度组成分析,l果见表3?/p> <p style="text-align: left;">? _度l成试验l果</p> <table style="border-collapse:collapse;" border="1" bordercolor="#000000" cellspacing="0" cellpadding="0"> <tbody> <tr> <td width="79"> <p align="center">_/mm</p> </td> <td width="66"> <p align="center">产率/%</p> </td> <td width="65"> <p align="center">品位/%</p> </td> <td width="65" valign="bottom"> <p align="center">分布?%</p> </td> <td width="65" valign="top"> <p align="center">SiO<sub>2</sub>含量</p> </td> </tr> <tr> <td width="79"> <p align="center">+0.125</p> </td> <td width="66"> <p align="center">9.18</p> </td> <td width="65"> <p align="center">49.80 </p> </td> <td width="65" valign="bottom"> <p align="center">6.91 </p> </td> <td width="65" valign="bottom"> <p align="center">15.94</p> </td> </tr> <tr> <td width="79"> <p align="center">-0.125+0.098</p> </td> <td width="66"> <p align="center">16.03</p> </td> <td width="65"> <p align="center">61.99 </p> </td> <td width="65" valign="bottom"> <p align="center">15.03 </p> </td> <td width="65" valign="bottom"> <p align="center">7.99</p> </td> </tr> <tr> <td width="79"> <p align="center">-0.098+0.074</p> </td> <td width="66"> <p align="center">11.81</p> </td> <td width="65"> <p align="center">66.53 </p> </td> <td width="65" valign="bottom"> <p align="center">11.88 </p> </td> <td width="65" valign="bottom"> <p align="center">7.40</p> </td> </tr> <tr> <td width="79"> <p align="center">-0.074+0.048</p> </td> <td width="66"> <p align="center">6.45</p> </td> <td width="65"> <p align="center">67.43 </p> </td> <td width="65" valign="bottom"> <p align="center">6.58 </p> </td> <td width="65" valign="bottom"> <p align="center">6.64</p> </td> </tr> <tr> <td width="79"> <p align="center">-0.048+0.038</p> </td> <td width="66"> <p align="center">18.38</p> </td> <td width="65"> <p align="center">68.97 </p> </td> <td width="65" valign="bottom"> <p align="center">19.17 </p> </td> <td width="65" valign="bottom"> <p align="center">4.49</p> </td> </tr> <tr> <td width="79"> <p align="center">-0.038</p> </td> <td width="66"> <p align="center">38.14</p> </td> <td width="65"> <p align="center">70.08 </p> </td> <td width="65" valign="bottom"> <p align="center">40.42 </p> </td> <td width="65" valign="bottom"> <p align="center">2.07</p> </td> </tr> <tr> <td width="79"> <p align="center">合计</p> </td> <td width="66"> <p align="center">100.00</p> </td> <td width="65"> <p align="center">66.12 </p> </td> <td width="65"> <p align="center">100.00 </p> </td> <td width="65"> <p align="center">5.66</p> </td> </tr> </tbody> </table> <p>从表3可以看出Q在-0.074mm的粒U中的全铁品位较高,均在67%以上Q其分布率高?6.17%。SiO<sub>2</sub>含量在粗_中含量较高?/p> 2  l果与讨?<p>2.1 普通铁_直接q行选柱试验</p> <p>Ҏ通磁铁矿直接q行选柱分选试验,程如图1所C,优化操作参数后的试验l果见表4?/p> <p style="text-align: left;">? 普通磁铁矿直接q行选柱分选试验结?/p> <table style="border-collapse:collapse;" border="1" bordercolor="#000000" cellspacing="0" cellpadding="0"> <tbody> <tr> <td width="48"> <p align="center">程</p> </td> <td width="44"> <p align="center">产品</p> </td> <td width="47"> <p align="center">产率/%</p> </td> <td width="41"> <p align="center">品位/%</p> </td> <td width="53"> <p align="center">回收?%</p> </td> <td width="89"> <p align="center">试验条g</p> </td> </tr> <tr> <td width="48" rowspan="3"> <p align="center">_?/p> </td> <td width="44"> <p align="center">_</p> </td> <td width="47"> <p align="center">96.22</p> </td> <td width="41"> <p align="center">67.21</p> </td> <td width="53"> <p align="center">98.46</p> </td> <td width="89" rowspan="3"> <p align="center">I<sub>?/sub>=0.2A</p> <p align="center">I<sub>?/sub>=0.8A</p> <p align="center">T=3s</p> <p align="center">W<sub>排矿</sub>=15ml/s</p> <p align="center">W<sub>溢流</sub>=115ml/s</p> </td> </tr> <tr> <td width="44"> <p align="center"></p> </td> <td width="47"> <p align="center">3.78</p> </td> <td width="41"> <p align="center">26.72</p> </td> <td width="53"> <p align="center">1.54</p> </td> </tr> <tr> <td width="44"> <p align="center">l矿</p> </td> <td width="47"> <p align="center">100.00</p> </td> <td width="41"> <p align="center">65.68</p> </td> <td width="53"> <p align="center">100.00</p> </td> </tr> <tr> <td width="48" rowspan="3"> <p align="center">_N?/p> </td> <td width="44"> <p align="center">_</p> </td> <td width="47"> <p align="center">96.56</p> </td> <td width="41"> <p align="center">68.43</p> </td> <td width="53"> <p align="center">98.31</p> </td> <td width="89" rowspan="3"> <p align="center">I<sub>?/sub>=0.2A</p> <p align="center">I<sub>?/sub>=0.8A</p> <p align="center">T=3s</p> <p align="center">W<sub>排矿</sub>=15ml/s</p> <p align="center">W<sub>溢流</sub>=125ml/s</p> </td> </tr> <tr> <td width="44"> <p align="center"></p> </td> <td width="47"> <p align="center">3.44</p> </td> <td width="41"> <p align="center">32.97</p> </td> <td width="53"> <p align="center">1.69</p> </td> </tr> <tr> <td width="44"> <p align="center">l矿</p> </td> <td width="47"> <p align="center">100.00</p> </td> <td width="41"> <p align="center">67.21</p> </td> <td width="53"> <p align="center">100.00</p> </td> </tr> </tbody> </table> <p style="text-align: center;"><img id="囄 7" src="/ewebeditor/uploadfile/20180921100802587001.jpg" style="width: 350px; height: 229px;"></p> <p style="text-align: center;">? 普通铁_直接q行选柱分选流E图</p> <p>从表4可以看出Q直接通过两段选柱选别普通铁_Q最l得到铁_品位仅ؓ68.43%Q不能得出合格的铁精矿品?/p> <p>2.2 普通铁_-200目粒U磁选柱试验</p> <p>?也表明,+200目中SiO<sub>2</sub>含量较高Q这是造成铁精矿直接分选不能得到合DU铁_的重要因素。因此将普通铁_中的+200目筛出ƈ单独处理Q?200目铁_作ؓ选柱l料q行分选,程见图2Q试验结果见??/p> <p style="text-align: center;"><img id="囄 8" src="/ewebeditor/uploadfile/20180921100802304002.jpg" style="width: 350px; height: 202px;"></p> <p align="center">? 普通铁_-200目粒U磁选柱试验程</p> <p>p5可知Q当固定场甉|?.2AӞ循环场甉|?.5A以上、溢流量达?00ml/s以上、精矿排矿流量ؓ10ml/sӞ通过两段选柱选别Q可选出_品位?1%以上的铁_?/p> <p style="text-align: left;">? 普通铁_-200目粒U磁选柱试验l果</p> <table style="border-collapse:collapse;" border="1" bordercolor="#000000" cellspacing="0" cellpadding="0"> <tbody> <tr> <td width="48"> <p align="center">程</p> </td> <td width="44"> <p align="center">产品</p> </td> <td width="47"> <p align="center">产率/%</p> </td> <td width="41"> <p align="center">品位/%</p> </td> <td width="53"> <p align="center">回收?%</p> </td> <td width="89"> <p align="center">试验条g</p> </td> </tr> <tr> <td width="48" rowspan="3"> <p align="center">_?/p> </td> <td width="44"> <p align="center">_</p> </td> <td width="47"> <p align="center">94.35</p> </td> <td width="41"> <p align="center">70.63</p> </td> <td width="53"> <p align="center">96.87</p> </td> <td width="89" rowspan="3"> <p align="center">I<sub>?/sub>=0.2A</p> <p align="center">I<sub>?/sub>=0.7A</p> <p align="center">T=3s</p> <p align="center">W<sub>排矿</sub>=13ml/s</p> <p align="center">W<sub>溢流</sub>=100ml/s</p> </td> </tr> <tr> <td width="44"> <p align="center"></p> </td> <td width="47"> <p align="center">5.65</p> </td> <td width="41"> <p align="center">38.06</p> </td> <td width="53"> <p align="center">3.13</p> </td> </tr> <tr> <td width="44"> <p align="center">l矿</p> </td> <td width="47"> <p align="center">100.00</p> </td> <td width="41"> <p align="center">68.79</p> </td> <td width="53"> <p align="center">100.00</p> </td> </tr> <tr> <td width="48" rowspan="3"> <p align="center">_N?/p> </td> <td width="44"> <p align="center">_</p> </td> <td width="47"> <p align="center">94.22</p> </td> <td width="41"> <p align="center">71.06</p> </td> <td width="53"> <p align="center">94.79</p> </td> <td width="89" rowspan="3"> <p align="center">I<sub>?/sub>=0.2A</p> <p align="center">I<sub>?/sub>=0.5A</p> <p align="center">T=3s</p> <p align="center">W<sub>排矿</sub>=10ml/s</p> <p align="center">W<sub>溢流</sub>=130ml/s</p> </td> </tr> <tr> <td width="44"> <p align="center"></p> </td> <td width="47"> <p align="center">5.78</p> </td> <td width="41"> <p align="center">63.62</p> </td> <td width="53"> <p align="center">5.21</p> </td> </tr> <tr> <td width="44"> <p align="center">l矿</p> </td> <td width="47"> <p align="center">100.00</p> </td> <td width="41"> <p align="center">70.63</p> </td> <td width="53"> <p align="center">100.00</p> </td> </tr> </tbody> </table> <p> </p> <p>2.3  9min?1min矿产品直接q行选柱试验</p> <p>管普通铁_-200目铁_能直接获得合格的铁精矿,然而普通铁_?200目含量高?7.02%Q铁_回收率较低。因此,考察矿—磁选柱程Ҏ通铁_的分选效果,程见图3Q结果见??/p> <p style="text-align: center;"><img id="囄 9" src="/ewebeditor/uploadfile/20180921100802865003.jpg" style="width: 400px; height: 213px;"></p> <p align="center">? 9min?1min矿-选柱分选流E图</p> <p style="text-align: left;">? 矿—磁选柱分选流E结?/p> <table style="border-collapse:collapse;" border="1" bordercolor="#000000" cellspacing="0" cellpadding="0" width="100%"> <tbody> <tr> <td width="37%"> <p align="center">优化的操作参?/p> </td> <td width="29%"> <p align="center">指标</p> </td> <td width="17%"> <p align="center">9min</p> </td> <td width="15%"> <p align="center">11min</p> </td> </tr> <tr> <td width="37%" rowspan="5"> <p align="center">_?/p> <p align="center">I?0.2A</p> <p align="center">I?0.7A</p> <p align="center">T=3s</p> <p align="center">W排矿=5ml/s</p> <p align="center">W溢流=130ml/s</p> </td> <td width="29%"> <p align="center">_品位/%</p> </td> <td width="17%"> <p align="center">70.85</p> </td> <td width="15%"> <p align="center">70.98</p> </td> </tr> <tr> <td width="29%"> <p align="center">品位/%</p> </td> <td width="17%"> <p align="center">41.24</p> </td> <td width="15%"> <p align="center">35.94</p> </td> </tr> <tr> <td width="29%"> <p align="center">l矿品位/%</p> </td> <td width="17%"> <p align="center">65.49</p> </td> <td width="15%"> <p align="center">65.48</p> </td> </tr> <tr> <td width="29%"> <p align="center">_产率/%</p> </td> <td width="17%"> <p align="center">81.90</p> </td> <td width="15%"> <p align="center">84.30</p> </td> </tr> <tr> <td width="29%"> <p align="center">回收?%</p> </td> <td width="17%"> <p align="center">88.60</p> </td> <td width="15%"> <p align="center">91.38</p> </td> </tr> <tr> <td width="37%" rowspan="5"> <p align="center">_N?/p> <p align="center">I?0.2A</p> <p align="center">I?0.5A</p> <p align="center">T=3s</p> <p align="center">W排矿=5ml/s</p> <p align="center">W溢流=130ml/s</p> </td> <td width="29%"> <p align="center">_品位/%</p> </td> <td width="17%"> <p align="center">71.46</p> </td> <td width="15%"> <p align="center">71.43</p> </td> </tr> <tr> <td width="29%"> <p align="center">品位/%</p> </td> <td width="17%"> <p align="center">68.04</p> </td> <td width="15%"> <p align="center">69.36</p> </td> </tr> <tr> <td width="29%"> <p align="center">l矿品位/%</p> </td> <td width="17%"> <p align="center">70.85</p> </td> <td width="15%"> <p align="center">70.98</p> </td> </tr> <tr> <td width="29%"> <p align="center">_产率/%</p> </td> <td width="17%"> <p align="center">82.16</p> </td> <td width="15%"> <p align="center">78.26</p> </td> </tr> <tr> <td width="29%"> <p align="center">回收?%</p> </td> <td width="17%"> <p align="center">82.87</p> </td> <td width="15%"> <p align="center">78.76</p> </td> </tr> </tbody> </table> <p>从表6可以看出Q?min?1min矿产品直接q行选柱Q均可选出品位?1%以上的精矿,但是Q随着矿l度的增大,_回收率越来越低?/p> <p>2.4 推荐选矿程</p> <p>Ҏ矿石性质及其特征Q通过一pd的试验研I与ҎQ采用磨ѝ磁选工艺比较合理,q能取得较好的选矿技术指标,工艺程及选矿指标分别见图4和表7?/p> <p style="text-align: center;"><img id="囄 12" src="/ewebeditor/uploadfile/20180921100803491004.jpg" style="width: 400px; height: 288px;" align="center"></p> <p align="center">? 推荐选矿工艺生񔭑纯铁精矿粉程</p> <p> </p> <p>?  推荐程的选矿工艺指标</p> <table style="border-collapse:collapse;" border="1" bordercolor="#000000" cellspacing="0" cellpadding="0" width="100%"> <tbody> <tr> <td width="31%"> <p align="center">产品名称</p> </td> <td width="21%"> <p align="center">产率/%</p> </td> <td width="21%"> <p align="center">品位/%</p> </td> <td width="26%"> <p align="center">回收?%</p> </td> </tr> <tr> <td width="31%"> <p align="center">_</p> </td> <td width="21%"> <p align="center">74.58</p> </td> <td width="21%"> <p align="center">71.84</p> </td> <td width="26%"> <p align="center">81.92</p> </td> </tr> <tr> <td width="31%"> <p align="center">普通铁_</p> </td> <td width="21%"> <p align="center">16.96</p> </td> <td width="21%"> <p align="center">65.49</p> </td> <td width="26%"> <p align="center">16.98</p> </td> </tr> <tr> <td width="31%"> <p align="center"></p> </td> <td width="21%"> <p align="center">8.46</p> </td> <td width="21%"> <p align="center">8.56</p> </td> <td width="26%"> <p align="center">1.10</p> </td> </tr> <tr> <td width="31%"> <p align="center">原矿</p> </td> <td width="21%"> <p align="center">100.00</p> </td> <td width="21%"> <p align="center">65.40</p> </td> <td width="26%"> <p align="center">100.00</p> </td> </tr> </tbody> </table> <p>p7可知Q通过Ҏ通铁_-200目磨矿处理,采用选管选初步提高品位,然后采选磁选柱两段选别Q超U铁_的品位由71.46%提高?1.84%Q回收率E_?1.87%左右。此外,品位?.56%Q达C排放品位Q且又获得了65.49%品位的合格普通铁_Q最l提高了产品的回收率Q提高了l济效益?/p> <p>2.5产品铁物相分析与化学多元素分?/p> <p>?1min矿产品选管_q行两段选柱选别后的W三l精矿品进行化学多元素与铁物相分析Q结果分别如8和表9所C?/p> <p style="text-align: left;">? 铁精矿的多元素分析结?nbsp;   %</p> <table style="border-collapse:collapse;" border="1" bordercolor="#000000" cellspacing="0" cellpadding="0"> <tbody> <tr> <td> <p align="center">成分</p> </td> <td> <p align="center">TFe</p> </td> <td> <p align="center">SiO<sub>2</sub></p> </td> <td valign="top"> <p align="center"> </p> </td> <td> <p align="center">Al<sub>2</sub>O<sub>3</sub></p> </td> <td> <p align="center">CaO</p> </td> <td> <p align="center">MgO</p> </td> <td> <p align="center">S</p> </td> <td> <p align="center">P</p> </td> </tr> <tr> <td> <p align="center">含量/%</p> </td> <td> <p align="center">71.84</p> </td> <td> <p align="center">0.23</p> </td> <td valign="top"> <p align="center"> </p> </td> <td> <p align="center">0.27</p> </td> <td> <p align="center">0.25</p> </td> <td> <p align="center">0.08</p> </td> <td> <p align="center">0.03</p> </td> <td> <p align="center">0.01</p> </td> </tr> </tbody> </table> <p style="text-align: left;">? 普通铁_物相分析l果   %</p> <table style="border-collapse:collapse;" border="1" bordercolor="#000000" cellspacing="0" cellpadding="0"> <tbody> <tr> <td valign="top"> <p>相名</p> </td> <td valign="top"> <p>铁?/p> </td> <td valign="top"> <p>菱铁?/p> </td> <td valign="top"> <p>褐铁?/p> </td> <td valign="top"> <p>酸?/p> </td> <td valign="top"> <p>化?/p> </td> </tr> <tr> <td valign="top"> <p>含量/%</p> </td> <td valign="top"> <p>99.08</p> </td> <td valign="top"> <p>0.10</p> </td> <td valign="top"> <p>0.17</p> </td> <td valign="top"> <p><0.10</p> </td> <td valign="top"> <p><0.10</p> </td> </tr> </tbody> </table> <p>p8和表9可知Q由?可知Q精矿的全铁品位?1.84QSiO<sub>2</sub>含量?.23%Q明N低,有害元素S、P的含量也显著降低。超U铁_中主要矿物ؓ铁ѝ?/p> 3  l?nbsp;   ?<p align="left">Q?Q该矿石中铁矿物嵌布_度相对较粗Q具备提U加工超U铁_的条Ӟ通过选工艺,可用来生产超U铁_?/p> <p align="left">Q?Q适当提高选柱入选品位,q保持磁选柱E_的溢量、精矿排矿口量Q有利于_产品质量的稳定?/p> <p align="left">Q?Q当矿l度Q?0.074mm含量Q达?8.41%Ӟ先后l磁选管和两D늣选柱选别后,可得到如下指标:_品位?1.84%Q回收率?1.92%Q中矿品位ؓ65.49%Q尾矿品位ؓ8.56%Q精矿中杂质含量达标Q结果较理想?/p> <p align="left">Q?Q普通铁_l选别在生产出纯铁精矿粉的同Ӟ产生全铁品位?5%以上的中矿,可直接引入普通铁_的生产工艺流E进行处理?/p> <p> </p> <br> <p></p> <p> </p> <br> <p></p> <br> <p></p> 作者:张文q? 高腾? 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