The 10th International Conference on Energy, Resources, Environment and Sustainable Development (ERESD 2024)

245 / 2024-03-14 11:44:22

Processing of Calcium Sulfate Type Mine Water by Induced Crystallization Technology

mine water,induced crystallization,calcium sulfate,crystal seed

Coal is one of the fundamental energy sources for the economic and social development of China. However, the mining processing and utilizing of coal resources generate significant amounts of high salinity and high hardness mine water, which will cause severe damage to the water environment if directly discharged. Wherein, high calcium sulfate type mine water contains a significant amount of salt ions such as Ca²⁺ and SO₄^2-, which can precipitate and adhere to the membrane or pipe wall, forming hard scale to lead to blockages or even corrosion of the membrane, pipeline, or equipment during operations and treatments. This study induced nucleation and growth of calcium sulfate on the surface of the pre-adding seed crystals in a simulated solution of high calcium sulfate type mine water, and found that crystal seed, supersaturation, temperature, rotational speed, and non-lattice ions all have an impact on the calcium removal effect. In addition, we visualized the crystal morphology of calcium sulfate induced by seed crystals, which appeared conical in shape. Altogether, this work attempts to apply a new type of induced crystallization technology to the calcium removal of mine water, reusing calcium salt ions and promoting effective recycling of mine water.