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首页> 外文会议>XXI International Mineral Processing Congress >REMOVAL OF MAGNESIUM FROM PHOSPHATES AND PHOSPHORIC ACID
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REMOVAL OF MAGNESIUM FROM PHOSPHATES AND PHOSPHORIC ACID

机译：从磷酸盐和磷酸中去除镁

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Among the impurities present in sedimentary phosphate rocks, magnesium is especially troublesome. Its removal depends on its status in the ore. Three examples of treatment of poor phosphates are related, each one being adapted to the mineralogy of MgO species and distribution. Abu Tartar Phosphate, containing 1.82% MgO, is characterized by the presence of ferriferous dolomite as subautomorphic crystals. High gradient Magnetic Separation can lead to a final concentrate grading 32.9% P_2O_5 and 0.4% MgO. The recovery of P_2O_5 attains 79%. Kalaat Khasba phosphate (1.38% MgO) contains well crystallized dolomite. Flotation using N-alkyl (coprah) amino-propionic acid is performed in two steps. The dolomite is first floated at pH = 7/7.5 and, after, the silica is removed at pH = 5, without changing the water. The final concentrate assays 31.83% P_2O_5 and 0.22% MgO, with P_2O_5 recovery of 84%. Djanatass phosphate, a deposit of Kara Tau Basin, features a high level of MgO (2.6%). The intimate mineralogical association of the individual components does not allow a flotation concentrate assaying more than 29.5% P_2O_5 nor less than 1.2% MgO. However, after sulphuric attack of that concentrate, a crude phosphoric acid is obtained, containing 27% P_2O_5 and 1.2% MgO. Further extraction of Magnesium from this weak phosphoric acid by using a strong acid cation exchange resin is able to reduce MgO content to 0.2%.
机译：在沉积磷酸盐岩石中存在的杂质中，镁特别麻烦。其去除取决于其在矿石中的状态。相关的三种磷酸盐处理实例涉及到MgO种类和分布的矿物学。含1.82％MgO的阿布塔塔尔磷酸盐的特征是存在亚铁结晶的亚铁白云石。高梯度磁选可导致最终精矿品位为32.9％P_2O_5和0.4％MgO。 P_2O_5的回收率达到79％。 Kalaat Khasba磷酸盐（1.38％MgO）包含结晶良好的白云石。分两步进行使用N-烷基（coprah）氨基丙酸的浮选。首先将白云石漂浮在pH = 7 / 7.5的位置，然后在pH = 5的条件下除去二氧化硅，而无需更换水。最终浓缩物检测出31.83％的P_2O_5和0.22％的MgO，P_2O_5的回收率为84％。 Djanatass磷酸盐是卡拉陶盆地的沉积物，具有高含量的MgO（2.6％）。各个组分的紧密矿物学联系使得浮选精矿的P2O_5含量不超过29.5％，MgO含量不超过1.2％。然而，在该浓缩物被硫酸侵蚀之后，获得了粗磷酸，其含有27％的P_2O_5和1.2％的MgO。通过使用强酸阳离子交换树脂从该弱磷酸中进一步萃取镁，能够将MgO含量降低至0.2％。

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