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border-style: none; border: 0px solid #fff;" src="/website/include/FABED9CE04664969B6B296DF11386194.html"></iframe> <!-- 文章 start--> <div class="container"> <div class="enterprise-info-box"> <div class="enterprise-info-category-descr"> <img src="/resource/website/article/Content/img/enterprise-info-category-descr.jpg" /> <a href="/index.html">首页</a> >> <a href="">中矿癄</a> >> <a href="/website/article/1418/index.html">选矿试验及工?/a> >> <a href="/website/article/141819/index.html">黑色金属?/a> >> 正文 </div> <div class="enterprise-info-mainbody"> <span id="id" style="display: none;">AD5011DD31B640999B0F714D6ABBDC1D</span> <div class="title">半自机q砂抛选在大红山铁矿的 研究及运?/div> <div class="sub-title">2018-09-21</div> <!-- D start --> <div class="introduction"> 针对半自机处理大红׃下低品位铁矿时返砂中Ҏ大粒径脉石的现象,昆钢?U山铁矿q行了干式预选抛废实验室试验及工业试?试验预先抛除了全铁品位低?4% 的废 矟뀂试验结果表?针对大红׃下低品位铁矿,采用滚{进行抛废行之有?能有效提高半?机时处理?降低矿能耗? </div> <!-- D start --> <!-- 正文 --> <div class="mainbody"> <div style="display:none">AhutCMS:HiddenContent</div> <span id="SwfFileUrl" style="display: none;"></span> <div 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" /> <script type="text/javascript" src="/library/FlexPaper/js/jquery.min.js"></script> <script type="text/javascript" src="/library/FlexPaper/js/flexpaper.js"></script> <div id="SwfDocumentViewer" class="flexpaper_viewer" style="position: relative; padding: 0px; width: 100%; height: 800px"></div> <script type="text/javascript"> $('#SwfDocumentViewer').FlexPaperViewer({ config: { SWFFile: '', Scale: 0.6, ZoomTransition: 'easeOut', ZoomTime: 0.5, ZoomInterval: 0.1, FitPageOnLoad: false, FitWidthOnLoad: true, FullScreenAsMaxWindow: false, ProgressiveLoading: false, MinZoomSize: 0.2, MaxZoomSize: 5, SearchMatchAll: true, InitViewMode: '', RenderingOrder: 'flash,html', StartAtPage: '', ViewModeToolsVisible: true, ZoomToolsVisible: true, NavToolsVisible: true, CursorToolsVisible: true, SearchToolsVisible: true, WMode: 'transparent', localeChain: 'en_US' } }); </script> </div> <script type="text/javascript"> var swfurl = document.getElementById("SwfFileUrl").innerHTML.toString().trim(); if (swfurl === "") { document.getElementById("ShowSwfDiv").innerHTML = ""; } </script> <div> <p> </p> <p align="left"> </p> <p> </p> <p> </p> <p>1. 前言</p> <p>在磁铁矿物的分选处理过E中Q磨矿过E能耗最高,占生产成本比例最大,为减入矿量,提高入磨品位Q降低选矿能耗,减少处理{费用,在磨矿前讄预选抛废环节,铁矿中的大部分脉石抛掉Q既能降低生产成本,又能有效提高后箋分选的入选品位?/p> <p>2. 贫磁铁矿选矿技术要?/p> <p>贫磁铁矿矛_有入选品位低、选矿比大、相寚w难选、资源利用率低等特点Q加上矿矛_开采过E中Q不可避免地混入一定数量的围岩和夹矻I特别是地下开采,围岩混入率一般达10%~20%Q从而降低了入选矿矛_位。若采用传统的选矿工艺Q全部矿岩进入选矿LE处理,吨精矉K矿加工费用很高。如何降低铁矿的选矿成本Q更好的适应市场h波动Q是矿山企业生l营中的关键?/p> <p>铁矉K矿工艺主要有破筛分、磨选过滤、尾矿排攑֏堆存{几个工序组成。破筛分是选矿作业的准备工序,所占选矿成本权重相对较低Q而磨矿及后箋选别工序的费用在选矿加工成本中所占比例较大。ؓ了提高入选矿矛_位,减少入磨矉KQ降低选矿厂能耗,Ҏ“多少,能抛早抛”的选矿原则Q近十多q来国内外一些磁铁矿选矿厂,在破筛分流E中讄了预先抛废作业,提前抛掉合格品位的废矻I且均取得了良好效果。这P矿分、后l选别以及排放{费用都大q度降低QM选矿加工成本也自焉低?/p> 3.预选抛废的U类 <p>矿石不论在何U条件下分选,其前提条件是矿物必须辑ֈ充分解离Q铁矿石的预选,其目的是抛出大部分已解离的废矻I使磁铁矿物得到够的富集。按预选方式的不同可分为干式预选和_矿湿式预选工艺。传l干式磁选抛废主要用磁滑轮Q用于大块矿矛_选和_粒强磁性矿物分选;对于l粒强磁性矿物的选别一般用湿式粗颗粒选机?/p> <p>3.1q式预选作?/p> <p>对于处理贫磁铁矿矻I随着大块q式选机( 滑? 的应用,_碎产品Q粒Uؓ0~200mmQ和{分{上产品Q粒Uؓ12~75 mmQ设|磁滑轮q选作业,矿石中的无性围岩和夹石提前抛掉Q可取得较好的经效益?/p> <p align="left">3.2前湿式预选作?/p> <p>铁矿矿矛_矿前应用干式磁选抛出废矻I是国内外q泛应用的一U方法,但随着破碎讑֤和破工艺的更新Q最l破粒度的减小以及矿石含水率、含泥量、粉矿含量等影响Q单U采用磁滑轮q选已难以满新工艺和l粒度的要求。针对磁滑轮预选在新工Z存在的问题,通过Ҏ型破设备破后的排矿粒度和矿石性质的分析,发现采用湿式选机对细_铁矿矌行磨前预选具有可行性。目前国内选矿厂破系l的最l品矿石粒U可辑ֈ-12mmQ甚?10mmQ这为磨前湿式粗_预选工艺的应用创造了条g。湿式磨前预选工Z新型破碎讑֤的配套用入磨品位有了大幅提高Q同时减了入磨l度Q大大提高了选矿厂的作业效率Q降低了选矿成本?/p> <p>玉溪大红q业有限公怸选厂分选的矿石Z下低品位铁矿QTFe22%~28%Q,或者熔岩露天矿QTFe16%~20%Q,选矿工艺为半自磨机、溢型球磨机磨矿,q强磁联合选别工艺。在日常生q程中,我们发现Q半自磨砂中存在已解ȝ脉石Q如果能这部分脉石预先抛除Q不仅能降低半自能耗,有效提高半自机处理量,同时Q也有利于后l分选作业的选别。由于半自磨砂ؓ振动{筛上物Q粒度>10mmQ因此,采用q式预选进行抛废?/p> <p>2.废石抛选可行性分?/p> <p>2.1q砂_度分析及干式抛选条件试?/p> <p>一步提高半自磨砂抛选的可靠性,为选矿工艺设计提供数据支撑Q技术中心开展了半自机q砂_度分析及返砂干抛条件试验,试验数据详见?.1-1?.1-2Q?/p> <p style="text-align: left;"> ?.1-1  半自机q砂_度分析                </p> <table style="border-collapse:collapse;" border="1" bordercolor="#000000" cellspacing="0" cellpadding="0"> <tbody> <tr> <td width="125"> <p align="center">{孔大小</p> </td> <td width="66"> <p align="center">重量/kg</p> </td> <td width="61"> <p align="center">产率/%</p> </td> <td width="94"> <p align="center">TFe品位/%</p> </td> <td width="84"> <p align="center">TFe的分布率/%</p> </td> <td width="60"> <p align="center">mFe/%</p> </td> <td width="79"> <p align="center">性铁占有?%</p> </td> </tr> <tr> <td width="125"> <p align="center">+60mm</p> </td> <td width="66"> <p align="center">1.411</p> </td> <td width="61"> <p align="center">11.23</p> </td> <td width="94"> <p align="center">17.52</p> </td> <td width="84"> <p align="center">8.60</p> </td> <td width="60"> <p align="center">0.93</p> </td> <td width="79" rowspan="8"> <p align="center">50.17</p> </td> </tr> <tr> <td width="125"> <p align="center">-60mm~+40mm</p> </td> <td width="66"> <p align="center">2.340</p> </td> <td width="61"> <p align="center">18.63</p> </td> <td width="94"> <p align="center">20.01</p> </td> <td width="84"> <p align="center">16.28</p> </td> <td width="60"> <p align="center">9.01</p> </td> </tr> <tr> <td width="125"> <p align="center">-40mm~+25mm</p> </td> <td width="66"> <p align="center">3.220</p> </td> <td width="61"> <p align="center">25.63</p> </td> <td width="94"> <p align="center">24.16</p> </td> <td width="84"> <p align="center">27.05</p> </td> <td width="60"> <p align="center">13.80</p> </td> </tr> <tr> <td width="125"> <p align="center">-25mm~+20mm</p> </td> <td width="66"> <p align="center">1.719</p> </td> <td width="61"> <p align="center">13.68</p> </td> <td width="94"> <p align="center">22.25</p> </td> <td width="84"> <p align="center">13.30</p> </td> <td width="60"> <p align="center">12.56</p> </td> </tr> <tr> <td width="125"> <p align="center">-20mm~+15mm</p> </td> <td width="66"> <p align="center">1.745</p> </td> <td width="61"> <p align="center">13.89</p> </td> <td width="94"> <p align="center">25.22</p> </td> <td width="84"> <p align="center">15.30</p> </td> <td width="60"> <p align="center">13.93</p> </td> </tr> <tr> <td width="125"> <p align="center">-15mm~+10mm</p> </td> <td width="66"> <p align="center">1.877</p> </td> <td width="61"> <p align="center">14.94</p> </td> <td width="94"> <p align="center">25.95</p> </td> <td width="84"> <p align="center">16.94</p> </td> <td width="60"> <p align="center">14.39</p> </td> </tr> <tr> <td width="125"> <p align="center">-10mm</p> </td> <td width="66"> <p align="center">0.250</p> </td> <td width="61"> <p align="center">1.99</p> </td> <td width="94"> <p align="center">29.11</p> </td> <td width="84"> <p align="center">2.53</p> </td> <td width="60"> <p align="center">18.20</p> </td> </tr> <tr> <td width="125"> <p align="center">Σ</p> </td> <td width="66"> <p align="center">12.562</p> </td> <td width="61"> <p align="center">100.00</p> </td> <td width="94"> <p align="center">22.89</p> </td> <td width="84"> <p align="center">100.00</p> </td> <td width="60"> <p align="center">11.49</p> </td> </tr> </tbody> </table> <p style="text-align: left;">?.1-2  半自机反砂q式抛尾条g试验               </p> <table style="border-collapse:collapse;" border="1" bordercolor="#000000" cellspacing="0" cellpadding="0"> <thead> <tr> <td width="99" rowspan="2"> <p align="center">q抛场场强</p> </td> <td width="81" rowspan="2"> <p align="center">转速r/min</p> </td> <td width="49" rowspan="2" valign="top"> <p align="center"> </p> </td> <td width="71" rowspan="2"> <p align="center">产率/%</p> </td> <td width="118" colspan="2" valign="top"> <p align="center">品位/%</p> </td> <td width="150" colspan="2" valign="top"> <p align="center">回收?%</p> </td> </tr> <tr> <td width="51" valign="top"> <p align="center">TFe</p> </td> <td width="67" valign="top"> <p align="center">mFe</p> </td> <td width="74" valign="top"> <p align="center">TFe</p> </td> <td width="76" valign="top"> <p align="center">mFe</p> </td> </tr> </thead> <tbody> <tr> <td width="99" rowspan="6"> <p align="center">1000mT</p> </td> <td width="81" rowspan="3"> <p align="center">45</p> </td> <td width="49" valign="top"> <p align="center">_</p> </td> <td width="71"> <p align="center">74.68 </p> </td> <td width="51"> <p align="center">26.82 </p> </td> <td width="67"> <p align="center">14.18 </p> </td> <td width="74"> <p align="center">87.50 </p> </td> <td width="76"> <p align="center">92.16 </p> </td> </tr> <tr> <td width="49" valign="top"> <p align="center"></p> </td> <td width="71"> <p align="center">25.32 </p> </td> <td width="51"> <p align="center">11.30 </p> </td> <td width="67"> <p align="center">3.56 </p> </td> <td width="74"> <p align="center">12.50 </p> </td> <td width="76"> <p align="center">7.84 </p> </td> </tr> <tr> <td width="49" valign="top"> <p align="center">原矿</p> </td> <td width="71"> <p align="center">100.00 </p> </td> <td width="51"> <p align="center">22.89 </p> </td> <td width="67"> <p align="center">11.49 </p> </td> <td width="74"> <p align="center">100.00 </p> </td> <td width="76"> <p align="center">100.00 </p> </td> </tr> <tr> <td width="81" rowspan="3"> <p align="center">55</p> </td> <td width="49" valign="top"> <p align="center">_</p> </td> <td width="71"> <p align="center">66.48 </p> </td> <td width="51"> <p align="center">27.47 </p> </td> <td width="67"> <p align="center">14.52 </p> </td> <td width="74"> <p align="center">79.78 </p> </td> <td width="76"> <p align="center">84.01 </p> </td> </tr> <tr> <td width="49" valign="top"> <p align="center"></p> </td> <td width="71"> <p align="center">33.52 </p> </td> <td width="51"> <p align="center">13.81 </p> </td> <td width="67"> <p align="center">5.48 </p> </td> <td width="74"> <p align="center">20.22 </p> </td> <td width="76"> <p align="center">15.99 </p> </td> </tr> <tr> <td width="49" valign="top"> <p align="center">原矿</p> </td> <td width="71"> <p align="center">100.00 </p> </td> <td width="51"> <p align="center">22.89 </p> </td> <td width="67"> <p align="center">11.49 </p> </td> <td width="74"> <p align="center">100.00 </p> </td> <td width="76"> <p align="center">100.00 </p> </td> </tr> <tr> <td width="99" rowspan="9"> <p align="center">600mT</p> </td> <td width="81" rowspan="3"> <p align="center">45</p> </td> <td width="49" valign="top"> <p align="center">_</p> </td> <td width="71"> <p align="center">73.30 </p> </td> <td width="51"> <p align="center">26.34 </p> </td> <td width="67"> <p align="center">14.36 </p> </td> <td width="74"> <p align="center">84.35 </p> </td> <td width="76"> <p align="center">91.61 </p> </td> </tr> <tr> <td width="49" valign="top"> <p align="center"></p> </td> <td width="71"> <p align="center">26.70 </p> </td> <td width="51"> <p align="center">13.42 </p> </td> <td width="67"> <p align="center">3.61 </p> </td> <td width="74"> <p align="center">15.65 </p> </td> <td width="76"> <p align="center">8.39 </p> </td> </tr> <tr> <td width="49" valign="top"> <p align="center">原矿</p> </td> <td width="71"> <p align="center">100.00 </p> </td> <td width="51"> <p align="center">22.89 </p> </td> <td width="67"> <p align="center">11.49 </p> </td> <td width="74"> <p align="center">100.00 </p> </td> <td width="76"> <p align="center">100.00 </p> </td> </tr> <tr> <td width="81" rowspan="3"> <p align="center">58</p> </td> <td width="49" valign="top"> <p align="center">_</p> </td> <td width="71"> <p align="center">69.28 </p> </td> <td width="51"> <p align="center">27.02 </p> </td> <td width="67"> <p align="center">15.34 </p> </td> <td width="74"> <p align="center">81.78 </p> </td> <td width="76"> <p align="center">92.49 </p> </td> </tr> <tr> <td width="49" valign="top"> <p align="center"></p> </td> <td width="71"> <p align="center">30.72 </p> </td> <td width="51"> <p align="center">13.58 </p> </td> <td width="67"> <p align="center">2.81 </p> </td> <td width="74"> <p align="center">18.22 </p> </td> <td width="76"> <p align="center">7.51 </p> </td> </tr> <tr> <td width="49" valign="top"> <p align="center">原矿</p> </td> <td width="71"> <p align="center">100.00 </p> </td> <td width="51"> <p align="center">22.89 </p> </td> <td width="67"> <p align="center">11.49 </p> </td> <td width="74"> <p align="center">100.00 </p> </td> <td width="76"> <p align="center">100.00 </p> </td> </tr> <tr> <td width="81" rowspan="3"> <p align="center">70</p> </td> <td width="49" valign="top"> <p align="center">_</p> </td> <td width="71"> <p align="center">64.67 </p> </td> <td width="51"> <p align="center">27.82 </p> </td> <td width="67"> <p align="center">15.77 </p> </td> <td width="74"> <p align="center">78.60 </p> </td> <td width="76"> <p align="center">88.76 </p> </td> </tr> <tr> <td width="49" valign="top"> <p align="center"></p> </td> <td width="71"> <p align="center">35.33 </p> </td> <td width="51"> <p align="center">13.87 </p> </td> <td width="67"> <p align="center">3.66 </p> </td> <td width="74"> <p align="center">21.40 </p> </td> <td width="76"> <p align="center">11.24 </p> </td> </tr> <tr> <td width="49" valign="top"> <p align="center">原矿</p> </td> <td width="71"> <p align="center">100.00 </p> </td> <td width="51"> <p align="center">22.89 </p> </td> <td width="67"> <p align="center">11.49 </p> </td> <td width="74"> <p align="center">100.00 </p> </td> <td width="76"> <p align="center">100.00 </p> </td> </tr> </tbody> </table> <p>通过?-1-1、表2-1-2可以看出Q针对于大红山铁矿三选厂的矿矻I采用q式抛选方案可行,且在场强度?00mT的磁场强度下可以将半自机q砂中的脉石预先抛除?/p> <p>3.工艺设计及生产指?/p> <p>3.1工艺设计</p> Ҏ型试验数据Q设计生产工艺流EؓQ半自磨机排矿经q振动筛{分后,{下物进后箋矿及选别程Q筛上物通过皮带输送,l过滚{抛除废矛_q回半自机再磨Q抛除的废石l皮带运输至废石仓,程图见?.1-1Q抛废徏{物断面图见?.1-2?<p></p> <p style="text-align: center;">  <img id="囄 22" src="/ewebeditor/uploadfile/20180921102021601001.jpg" style="width: 300px; height: 217px;"><img id="囄 24" src="/ewebeditor/uploadfile/20180921102022734002.jpg" style="width: 330px; height: 218px;"></p> <p style="text-align: center;"> ?.1-1  抛废程?nbsp;         ?.1-2  抛废建筑物断面图 </p> <p style="text-align: left;">3.2讑֤选型</p>   ?.3-1  讑֤选型?<table style="border-collapse:collapse;" border="1" bordercolor="#000000" cellspacing="0" cellpadding="0"> <tbody> <tr> <td width="101" valign="bottom"> <p align="center">讑֤名称</p> </td> <td width="86" valign="bottom"> <p align="center">规格型号</p> </td> <td width="92" valign="bottom"> <p align="center">场强度</p> </td> <td width="79" valign="bottom"> <p align="center">系包角</p> </td> <td width="101" valign="bottom"> <p align="center">有效场深度</p> </td> <td width="86" valign="bottom"> <p align="center">备注</p> </td> </tr> <tr> <td width="101" valign="bottom"> <p align="center">滚{?/p> </td> <td width="86" valign="bottom"> <p align="center">CT5095</p> </td> <td width="92" valign="bottom"> <p align="center">Q?500高斯</p> </td> <td width="79" valign="bottom"> <p align="center">150</p> </td> <td width="101" valign="bottom"> <p align="center">15cm</p> </td> <td width="86" valign="bottom"> <p align="center"> </p> </td> </tr> </tbody> </table> <p>3.3生指标</p> 抛废目?017q?2?0日徏成投入试生Q试生阶段׃l验不Q磁滚筒下方漏斗L位置调整不合理、磁滚筒l矿料层厚度q大Q导致废矛_位偏高。通过调整滚{下Ҏ斗翻板位|,磁滚筒l矿皮带槽型支架改ؓq支架{系列整Ҏ施,抛废品位辑ֈ要求。数据统计详见表3.3-1?<p style="text-align: left;">?.3-1  抛废生数据l计?/p> <table style="border-collapse:collapse;" border="1" bordercolor="#000000" cellspacing="0" cellpadding="0"> <tbody> <tr> <td width="72" rowspan="2"> <p align="center">月䆾</p> </td> <td width="168" colspan="2" valign="bottom"> <p align="center">废石QtQ?/p> </td> <td width="161" colspan="2" valign="bottom"> <p align="center">TFe%</p> </td> <td width="147" colspan="2" valign="bottom"> <p align="center">mFe%</p> </td> </tr> <tr> <td width="81" valign="bottom"> <p align="center">当月</p> </td> <td width="86" valign="bottom"> <p align="center">累计</p> </td> <td width="81" valign="bottom"> <p align="center">当月</p> </td> <td width="81" valign="bottom"> <p align="center">累计</p> </td> <td width="67" valign="bottom"> <p align="center">当月</p> </td> <td width="80" valign="bottom"> <p align="center">累计</p> </td> </tr> <tr> <td width="72" valign="bottom"> <p align="center">1?/p> </td> <td width="81" valign="bottom"> <p align="center">4786.98 </p> </td> <td width="86" valign="bottom"> <p align="center">4786.98 </p> </td> <td width="81" valign="bottom"> <p align="center">14.98 </p> </td> <td width="81" valign="bottom"> <p align="center">14.98 </p> </td> <td width="67" valign="bottom"> <p align="center">0.98 </p> </td> <td width="80" valign="bottom"> <p align="center">0.98 </p> </td> </tr> <tr> <td width="72" valign="bottom"> <p align="center">2?/p> </td> <td width="81" valign="bottom"> <p align="center">9200.87 </p> </td> <td width="86" valign="bottom"> <p align="center">13987.85 </p> </td> <td width="81" valign="bottom"> <p align="center">14.02 </p> </td> <td width="81" valign="bottom"> <p align="center">14.35 </p> </td> <td width="67" valign="bottom"> <p align="center">1.48 </p> </td> <td width="80" valign="bottom"> <p align="center">1.31 </p> </td> </tr> <tr> <td width="72" valign="bottom"> <p align="center">3?/p> </td> <td width="81" valign="bottom"> <p align="center">9678.02 </p> </td> <td width="86" valign="bottom"> <p align="center">23665.87 </p> </td> <td width="81" valign="bottom"> <p align="center">14.11 </p> </td> <td width="81" valign="bottom"> <p align="center">14.25 </p> </td> <td width="67" valign="bottom"> <p align="center">1.40 </p> </td> <td width="80" valign="bottom"> <p align="center">1.35 </p> </td> </tr> <tr> <td width="72" valign="bottom"> <p align="center">4?/p> </td> <td width="81" valign="bottom"> <p align="center">2216.67 </p> </td> <td width="86" valign="bottom"> <p align="center">25882.53 </p> </td> <td width="81" valign="bottom"> <p align="center">13.49 </p> </td> <td width="81" valign="bottom"> <p align="center">14.18 </p> </td> <td width="67" valign="bottom"> <p align="center">1.31 </p> </td> <td width="80" valign="bottom"> <p align="center">1.34 </p> </td> </tr> </tbody> </table> <p> </p> <p>4.l语</p> <p>通过预先抛废的生产实践表明,针对于脉矛_体解较高的铁矿石Q采用预先抛废作业,可提前抛掉已单体解离的脉矻I减少q入机的岩石量Q提高矿矛_选品位,不仅优化了磨矿作业条Ӟ降低了能耗,提高了选矿生能力Q同时还减少了尾矿处理及储存费用Q磁滚筒预选工之有效?/p> <p> </p> <br> <p></p> <p></p> <br> <p></p> 作者:崔宁 黄志?h 黄斌鹏林{(昆钢大红山铁矿)本文发表于《现代矿业?018q第7?<p></p> <p style="color: rgb(0, 0, 0); font-family: 宋体; font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; 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