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由于碳酸钙镁石和菱镁矿具有相近的化学结构和组成,所以它们具有相近的可浮性,用浮选法难以分离它们。在本工作中用微量浮选试验和常规小型浮选试验研究了从菱镁矿中浮选分离碳酸钙镁石的最佳条件。用Zeta电位测定结果解释了浮选分离的机理。常见离子(Ca2+和Mg2+)特效吸附在碳酸钙镁石和菱镁矿表面上,使得矿物表面带正电荷。原矿浮选试验发现,菱镁矿进入泡沫产品中,而碳酸钙镁石进入槽内产品中。在碱性范围内,CMC是碳酸钙镁石的强抑制剂,而对菱镁矿的抑制作用比较弱。在原矿浮选试验中,获得的菱镁矿精矿的纯度为81·28%,含45·26%MgO和2·97%CaO,菱镁矿的回收率为16·9%。碳酸钙镁石精矿的碳酸钙镁石的纯度为97·71%,含34·07%MgO和15·52%CaO,碳酸钙镁石的回收率为86·2%。
Because of the similar chemical structure and composition of magnesia and magnesite, they have similar floatability and are difficult to separate by flotation. In this work, the best flotation separation of magnesia from magnesite was studied by micro-flotation and conventional small flotation. Zeta potential measurements explain the mechanism of flotation separation. Common ions (Ca2 + and Mg2 +) special effects adsorption on the huntite and magnesite surface, making the mineral surface with a positive charge. Raw ore flotation test found that magnesite into the foam products, and carbonate into the channel products. In the alkaline range, CMC is a strong inhibitor of huntite and has a weaker inhibitory effect on magnesite. In the ore flotation test, the purity of the obtained magnesite concentrate was 81.28%, containing 45.26% MgO and 2.97% CaO, and the recovery rate of magnesite was 16.9%. The purity of huntadine in the huntite ore concentrate was 97.71% with 34.07% MgO and 15.52% CaO, and the recovery rate of huntite was 86.2%.