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正浮选
直接浮选
In the above research, the inhibitor NO-2 is organic with strong dispersing capability. Besides, to function fully, the phosphorite middling slurry has to be in a comparatively high temperature, which leads to a higher cost of floatation. Hence in order to study effects of inorganic dispersant sodium hexameta phosphate upon floatation, as its inhibiting capability is quite strong, its dosage should be small. Apart from this, 9.0 kg/t sodium silicate is added into the direct floatation roughing. So no such reagent is added into the roughing but into fineness of direct dosage is 0.2 kg/t. When the dosage increases to 0.3 kg/t, no foam will appear in the fineness. This indicates that the dosage is quite large.
From the above researches it is found that neither direct floatation nor single reverse floatation can achieve a concentrate grade of more than 30%. As the content of carbonate in the rock is fairly high, the combination of floatation and roasting digestion is investigated. Concentrate of direct floatation is roasted under different high temperatures for two to three hours and then cooled down. Then some water is added in to mix with and assimilate the concentrate. After that the concentrate is filtered and its grade analyzed.
Based on the above test the grinding finenesses and dosages of direct floatation reagents including sodium carbonate, sodium silicate, and TSK-125 are determined and a test of H3PO4 dosage in reverse floatation is carried out.
In heated direct and reverse floatation, concentrate grade still fails to reach 30%. The ore dressing efficiency does not increase much in direct floatation with addition of a carbonate inhibitor NO-2. Hence in subsequent tests no heating is provided nor NO-2. But from the test result we find that addition of H3PO4 in reverse floatation may increase concentrate grades.
As the phosphorite contains both carbonate and silicate minerals, neither single direct floatation nor single reverse floatation can obtain a good floatation index.
由于该磷矿既含碳酸盐矿物,也含硅酸矿物,因此单一正浮选或者单一的反浮选较难获得较好的选矿指标。
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