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摘要:
为了清洁高效利用湿法磷酸生产得到的萃余酸，创新性地提出将其应用于磷矿浮选过程。在磨矿细度、捕收剂用量、pH几乎不变条件下，萃余酸全部取代硫酸的闭路浮选后，获得P2O5品位为29.73%、MgO品位为0.78%，P2O5回收率为88.55%的浮选精矿。用萃余酸作为磷矿反浮选pH调整剂，用量远低于硫酸，为磷矿企业萃余酸循环利用提供了新思路。
Abstract:The raffinate acid obtained from the production of wet-process phosphoric acid for clean and efficient utilization is innovatively used in the flotation of phosphate ore. The flotation concentration with the P2O5 grade of 29.73%, the MgO grade of 0.78% and the P2O5 recovery of 88.55% is obtained under the condition of stable grinding fineness, collector dosage, pH after the closed-circuit flotation where the raffinate acid completely replaces the sulfuric acid. The raffinate, whose dosage is much lower than sulfuric acid, is used as pH regulator for reverse flotation of phosphate ore, which provides a new idea for recycling raffinate in phosphate mining enterprises.
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Key words:
- raffinate acid /
- phosphate ore /
- reverse flotation
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表 1 矿样多元素分析结果表
Table 1. Results of multi-element analysis of samples
/% 元素 P2O5 MgO Fe2O3 Al2O3 SiO2 CaO 含量 20.40 5.66 0.86 1.36 16.36 36.52 
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表 2 萃余酸分析结果
Table 2. Analysis results of raffinate acid
/% 组分 P2O5 含固量 密度/(g·mL-1) SO42- Fe2O3 Al2O3 MgO H+/(mol·L-1) 含量 46.65 11.49 1.78 3.88 1.53 2.9 4.55 0.56
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表 3 闭路浮选试验结果
Table 3. Test results of closed circuit
产品名称 产率/% 品位/% 回收率/% P2O5 MgO P2O5 精矿 61.91 29.73 0.78 88.55 尾矿 38.09 6.25 13.21 11.45 原矿 100.00 20.78 5.71 100.00
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