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Multistep concentration of lizardite/antigorite from chrysotile mine tailings – case of the Carey Mine site in East-Broughton (Québec)
International Journal of Chemical Reactor Engineering ( IF 1.6 ) Pub Date : 2021-05-01 , DOI: 10.1515/ijcre-2020-0242
Dieudonné Kabombo 1, 2 , Dariush Azizi 1, 3 , Réjean Hébert 2, 4 , Faïçal Larachi 1
Affiliation  

Revalorization of mining residues is of central concerns to the mining industry and the environment. Specifically, environmental management of residual products from the exploitation of chrysotile in the Thetford Mines region is one of the government concerns in Quebec and Canada. This work uses mining wastes in a second resource generation for production of magnesium from cheap and health-friendly mineral sources; the goal being to produce chrysotile-depleted pre-concentrates for a use as precursors in the leach off extraction of magnesium. The concentration of lizardite/antigorite from chrysotile containing serpentine rock mine tailings originating from the Carey Mine site in East-Broughton (Québec) was carried out using a suite of hydrocyclone, settling/decantation and magnetic separations. Four size classes of the mining residue, namely (−3150,+1580), (−1580, +600), (−600, +300) and (−300, +150) μm, were tested with an aim to reduce the level of objectionable asbestos fibers to allow access to the safer Mg-bearing minerals contained in the mine waste sources. The asbestos fibers clean-up consisted of subjecting the sieved fractions to two hydrocyclone steps, six settling/decantation steps and two magnetic separation steps. The best results were achieved when the hydrocyclone separators led to Mg recovery of 85% (±4) for the coarsest size fraction size. Both hydrocyclone underflow streams underwent settling/decantation separations. The settling tests lasted 30 min and led to Mg recoveries of 82.5% (±1.8) of Mg in the ultimate concentrate. SEM characterizations revealed that it was possible to reduce substantially the amount of chrysotile fibers to render the coarse-sized fraction in the mining waste usable while significantly lowering the health risk of the fibers. A two-step magnetic separation was applied to the final settling/decantation underflow to remove magnetic minerals such as magnetite from the lizardite/antigorite concentrate. The final quasi-non-magnetic chrysotile-depleted lizardite/antigorite concentrate allowed sample recovery of 62.5% (±0.9) wt. of Mg. These preliminary results are intended as a first compulsory step in support of viable restoration and sustainable development scenarios for the Thetford Mines mining sites as second-breath sources for valuable magnesium.

中文翻译:

温石矿尾矿中的蜥蜴石/锑铁矿的多步浓缩-以东布劳顿(魁北克)的凯里矿场为例

采矿残渣的重新估价是采矿业和环境的核心问题。具体而言,塞特福德矿业地区温石棉开采残余产品的环境管理是魁北克和加拿大政府关注的问题之一。这项工作将采矿废物用于第二代资源,以从廉价且对健康有益的矿产资源中生产镁;目的是生产温石棉贫化的预浓缩物,以用作镁浸出提取的前体。使用一套水力旋流器,沉降/倾析和磁选法对含温石棉的蛇纹石/蛇纹石进行浓缩,该蛇纹石/蛇毒石来自东部布劳顿(魁北克)的凯里矿场,来自蛇纹岩矿山尾矿。采矿残渣的四个尺寸类别,即(−3150,测试了(+1580),(− 1580,+ 600),(− 600,+ 300)和(−300,+ 150)μm,目的是减少有害的石棉纤维含量,以获取更安全的Mg-承载矿山废物源中所含的矿物质。石棉纤维的清理工作包括对筛分进行两个水力旋流器步骤,六个沉降/倾析步骤和两个磁分离步骤。当水力旋流器分离器的最粗粒度级分的Mg回收率达到85%(±4)时,可获得最佳结果。两种水力旋流器底流均经过沉降/倾析分离。沉降测试持续了30分钟,最终精矿中的Mg回收率为82.5%(±1.8)。SEM特征表明,可以大大减少温石棉纤维的数量,从而使采矿废料中的粗粒级分可以使用,同时显着降低纤维的健康风险。对最终的沉降/倾析底流进行两步磁分离,以从蜥蜴石/蛇纹石精矿中除去磁性矿物,例如磁铁矿。最终的准非磁性温石棉消耗型蜥蜴石/蛇纹石精矿可回收62.5%(±0.9)wt。镁 这些初步结果旨在作为第一个强制性步骤,以支持Thetford Mines矿山作为有价值的镁的第二呼吸源,进行可行的恢复和可持续发展方案。对最终的沉降/倾析底流进行两步磁分离,以从蜥蜴石/蛇纹石精矿中除去磁性矿物,例如磁铁矿。最终的准非磁性温石棉消耗型蜥蜴石/蛇纹石精矿可回收62.5%(±0.9)wt。镁 这些初步结果旨在作为第一个强制性步骤,以支持Thetford Mines矿山作为有价值的镁的第二呼吸源,进行可行的恢复和可持续发展方案。对最终的沉降/倾析底流进行两步磁分离,以从蜥蜴石/蛇纹石精矿中除去磁性矿物,例如磁铁矿。最终的准非磁性温石棉消耗型蜥蜴石/蛇纹石精矿可回收62.5%(±0.9)wt。镁 这些初步结果旨在作为第一个强制性步骤,以支持Thetford Mines矿山作为有价值的镁的第二呼吸源,进行可行的恢复和可持续发展方案。
更新日期:2021-05-12
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