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摘要:
利用电解水改善胶体磨对生石膏的超细粉磨效果，并采用FTIR等手段对溶液和超细磨产品进行了表征。结果表明，电解改性水对生石膏超细磨效果的改善作用明显。在料浆质量浓度为16%、超细磨时间为25 min的条件下，利用电解20 min的改性水可使生石膏超细磨产品的d90从54.6 μm减小至2.21 μm，比表面积则从203 cm2/g增大至2265 cm2/g。当水经电解处理20 min时，水体中自由水的羟基总含量增大了2.42百分点，强化了生石膏表面钙离子活性点与水之间的亲和作用，导致生石膏料浆黏度减小了16.74 mPa·s。上述作用可改善生石膏料浆的流动性并强化胶体磨齿轮对生石膏的剪切作用，使生石膏超细磨产品内部裂纹增多并有利于改性水渗入生石膏内部，使其最强峰面间距、微观应变和位错密度增大而结晶度和晶粒尺寸变小，最终提高了生石膏超细磨效率。
Abstract:Electrolytic water was used to improve the ultrafine grinding effect of raw gypsum with colloid mill, FTIR and other methods were employed to characterize the solution and ultrafine grinding products. The results showed that the electrolysis-modified water had a significant positive effect on the ultrafine grinding of raw gypsum. Under the conditions of raw gypsum slurry concentration of 16% and ultrafine grinding time of 25 min, the d90 of ultrafine grinding product was reduced from 54.6 μm to 2.21 μm, while the specific surface area was promoted from 203 cm2/g to 2265 cm2/g with water modification time of 20 min. When the water was treated by electrolysis for 20 min, the total content of hydrophilic hydroxyl groups of water increased by 2.42 percentage points, which enhanced the affinity between water and active point on raw gypsum surface, resulting in a decrease in the viscosity of raw gypsum slurry by 16.74 mPa·s. The above effects can improve the fluidity of raw gypsum slurry and enhance the shearing effect of colloid mill gear on raw gypsum, which increased the internal cracks of the raw gypsum, the penetration of the modified water into the raw gypsum, and the plane spacing, microscopic strain, dislocation density of the gypsum increased, while the crystallinity and grain size became smaller, and finally the efficiency of raw gypsum superfine grinding was improved.
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Key words:
- gypsum /
- ultrafine grinding /
- electrolytic modification /
- water /
- crystal structure
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表 1 生石膏原料的多元素分析结果
Table 1. Chemical composition of gypsum
/% CaO SO3 SiO2 MgO Fe2O3 烧失量 31.47 44.68 1.52 1.12 0.15 19.96 
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