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摘要:
以南方某高岭土为对象，在试样性质研究的基础上，系统考查了pH值、保险粉用量、草酸用量、矿浆浓度、温度等因素对高岭土白度的影响。结果表明：该高岭土属于砂质高岭土，影响白度的矿物主要为赤铁矿、磁铁矿和金红石；在较优的除铁增白实验条件下，获得了Fe2O3含量为0.46%，白度为80.82%的高岭土产品；为该高岭土矿的开发利用提供技术支撑。
Abstract:Taking a certain kaolin in the south as the object, based on the study of sample properties, the influence of factors such as pH value, sodium sulfonate dosage, oxalic acid dosage, pulp concentration, temperature and other factors on the whiteness of kaolin was systematically investigated. The results show that the kaolin belongs to sandy kaolin, and the iron-containing minerals that affect the whiteness are mainly hematite, magnetite and rutile; under the optimal test conditions for iron removal and whitening, the Fe2O3 content is 0.46%. Kaolin product with a brightness of 80.82%; Provide technical support for the development and utilization of the kaolin mine.
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Key words:
- Kaolin /
- Iron removal /
- Iron removal and whitening
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表 1 试样化学多元素分析结果/%
Table 1. Results of chemical multi-element analysis of samples
SiO2 Al2O3 Fe2O3 TiO2 MgO K2O Na2O 白度* 50.12 34.77 0.96 0.098 0.20 1.36 0.038 59.15 *为105℃干燥后测得的蓝光白度。 
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表 2 试样粒度组成和矿物组成分析结果/%
Table 2. Results of grain and mineral composition analysis of samples
粒径
/μm占比 高岭石 赤铁矿 石英 磁铁矿 伊利石 金红石 其他 +2000 13.03 6.51 0.06 88.07 / 4.41 / 0.95 −2000+420 25.67 1.57 0.73 93.52 / 3.20 / 0.98 −420+124 7.30 10.89 0.85 75.20 0.16 10.21 / 2.69 −124+74 2.00 29.41 1.37 40.88 0.46 24.20 0.29 3.39 −74+44 3.17 43.51 1.18 25.31 0.18 27.07 0.20 2.55 −44+25 1.70 52.06 0.77 17.29 0.17 27.15 0.23 2.33 −25 47.13 75.02 0.16 2.38 0.01 17.55 0.02 4.86 合计 100.00 40.26 1.02 44.01 0.03 12.22 0.03 3.05
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表 3 除铁增白实验方案对比结果
Table 3. Comparison results of iron removal and whitening test methods
方法 Fe2O3/% 白度/% 磁选法 0.94 60.03 保险粉法 0.70 80.10 二氧化硫脲法 0.72 81.66 原矿 0.96 59.15
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表 4 矿浆浓度对白度的影响结果/%
Table 4. Effect of pulp concentration on whiteness
矿浆浓度 Fe2O3 白度 10 0.77 78.56 20 0.46 80.82 30 0.45 80.50
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表 5 温度对白度的影响
Table 5. Effect of temperature on whiteness
温度/℃ Fe2O3/% 白度/% 25 0.76 78.39 50 0.46 80.82 80 0.86 80.75
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表 6 除铁增白后高岭土产品化学多元素分析/%
Table 6. Chemical multi-element analysis of kaolin products after iron removal and whitening
SiO2 Al2O3 Fe2O3 TiO2 MgO K2O Na2O 白度 46.31 36.67 0.46 0.032 0.20 0.94 0.048 80.82
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