Abstract:

This study focused on the well water from Wudong mine in Xinjiang as the research subject. The Oddo-Tomson saturation index method was employed to forecast the scaling trends of CaCO₃ and CaSO₄ in the mine water. Additionally, the mechanism of deposition of individual CaCO₃ and CaSO₄ scales, as well as mixed sedimentary scales on heated metal surfaces was investigated through static scaling experiments. The scaling pattern, composition, and morphology of scaling substances on metal surfaces caused by mine water was analyzed under various working conditions. The results indicated that in highly mineralized mine water, the formation of CaCO₃ scales was rapidly, with no discernible induction period observed during the scale formation process. The crystals primarily consisted of calcite and aragonite. In contrast, CaSO₄ scales were formed at a slower rate, with a 10 minute induction period observed in static experiments with the form of needle-like structures. During the deposition process of mixed scales, the scaling mechanism was primarily dominated by CaCO₃, with an aragonite layer initially forming on the wall, followed by the growth of CaSO₄ crystals. with the increase of temperature, there were varying degrees of change in the scaling volume and crystal form of the mine water: at 70 ℃, CaSO₄ precipitated, and the experimental results were consistent with those of the Oddo-Tomsom saturation index method. When the temperature rised to 80 ℃, CaCO₃ showed a trend of secondary nucleation.

Key words: Oddo-Tomson saturation index method, mine water, salcium sulphate, calcium carbonate

摘要：

以新疆乌东矿矿井水为研究对象，采用Oddo-Tomson饱和指数法对矿井水中的CaCO₃、CaSO₄进行结垢趋势预测，并通过静态结垢实验研究了单一CaCO₃垢、CaSO₄垢及混合沉积垢在换热金属表面上的沉淀机制。实验还分析了不同工况下矿井水在金属表面的结垢规律、结垢物成分及形貌。结果表明：高矿化度矿井水中CaCO₃成垢速度快，形成过程中基本观测不到诱导期，晶体主要由方解石和文石构成；而CaSO₄成垢速度慢，静态实验中结垢诱导期为10 min，晶体呈针状。混合垢沉积过程中，成垢机制主要由CaCO₃主导，壁上首先形成文石层，随后CaSO₄晶体生长。同时，随着温度的上升，矿井水的结垢量及晶型均有不同程度的变化：温度为70 ℃时有CaSO₄析出，实验结果与Oddo-Tomsom饱和指数法的计算结果一致；当温度提高到80 ℃时，CaCO₃有二次成核的趋势。

关键词: Oddo-Tomson饱和指数法, 矿井水, 硫酸钙, 碳酸钙

CLC Number: 

• X703.1