Feldspar for ceramic/glass industries requires sufficiently low content of harmful colourants (Fe-, Ti-, Mn-bearing mineral phases). Hydrothermally altered albite-rich granites are increasingly used as feldspar raw material nowadays; however, they are often marked by increased content of colourants, which must be removed during the processing of feldspar ore. Parallel to the content of colourants, these phases show enrichment in some critical raw materials (CRMs), specifically of Nb, Ta, and Li. In the current study, the laboratory trials focused on the possibility of reprocessing of waste generated during basic magnetic separation of feldspar ore. Major aim of these trials was to search for a processing scheme that would allow for obtaining of mineralogically homogeneous fractions, part of which could be utilised as a source of CRMs. According to the results, combination of gravity, magnetic and heavy liquid separation is highly effective in obtaining of desirable concentrates. Feldspar ore processing waste thus presents potential source of CRMs; however, semi-industrial and full-scale trial must follow in order to prove the economic and environmental suitability of the suggested processing scheme.

中文翻译：

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从与水热蚀变花岗岩相关的长石矿石加工废料中回收一些关键原料：实验室规模的选矿

陶瓷/玻璃行业的长石需要足够低含量的有害着色剂（含铁，钛，锰的矿物相）。如今，热液蚀变的富含钠长石的花岗岩越来越多地被用作长石的原材料。然而，它们通常以着色剂含量增加为标志，在长石矿石的加工过程中必须将其去除。这些阶段与着色剂的含量平行，显示出某些关键原材料（CRM）的富集，尤其是Nb，Ta和Li的富集。在当前的研究中，实验室试验集中于对长石矿石进行基本磁选过程中产生的废物进行再处理的可能性。这些试验的主要目的是寻找一种处理方案，以允许获得矿物学上均质的馏分，其中一部分可以用作CRM的来源。根据结果​​，重力，磁力和重液分离的组合在获得所需浓缩物中非常有效。因此，长石矿石加工废料是CRM的潜在来源。但是，必须进行半工业和大规模试验，以证明所建议加工方案的经济和环境适应性。