陶瓷工业中对产自花岗岩的长石原料的提纯方法研究

花岗岩是陶瓷工业中所需长石原料的重要来源之一.由于花岗岩中云母和氧化铁的存在，其最终产品的质量受到影响（强度、硬度、密度降低）.本研究对浙江花岗岩采用两阶段分离方法，以提高花岗岩中长石的质量.第一阶段为重力分离，去除重矿物杂质；第二阶段为磁性分离，进一步减少铁含量.用机械方法对不同加工阶段的3种样品进行了成分测试：1）原料花岗岩；2）第一阶段处理的花岗岩；3）第二阶段处理的花岗岩.结果显示，最终处理后的样品较之原始花岗岩在显微硬度、强度、密度及裂隙坚韧性方面都有明显提高.

RECOVERY OF FELDSPAR RAW MATERIAL FROM GRANITE ROCKS FOR CERAMIC AND PORCELAIN INDUSTRIES

Granite is the main source of feldspar for ceramic and porcelain industry after pegmatite. The problem with granite as a source of feldspar is the presence of mica and iron oxides that cause reducing the strength,hardness and density of the final product (low quality ceramics). This study presents the results of applying two phases of separation on Zhejiang granite,Southeastern China,in order to improve the quality of the feldspar obtained from this granite. The first phase is gravitational separation to remove the heavy impurities and the second phase is magnetic separation to further minimize the iron content.Mechanical property tests are conducted on the feldspar product of 3 samples:raw granite,processed granite Ⅰ (granite after gravity separation,china clay and quartz),and processed granite Ⅱ(granite after complete processing,china clay and quartz). Micro-hardness,strength,fracture toughness and density show sharp improvement in the quality of the processed granite relative to raw one. This improvement is attributed to the absence of undesired impurities (mica and heavy minerals).