With regard to the influence of different mass concentrations at magnesium leaching, the behavior is similar to that of calcium with talc. Regardless of the acid concentration in the solution, the identical ion concentration ratio 𝐶 𝑀𝑔,𝑇𝑎𝑙𝑐 * is present after 3 hours of leaching in Figure (right) and all 𝐶 𝑀𝑔,𝐴𝑛ℎ𝑦𝑑𝑟𝑖𝑡𝑒 * values are within a same range, too. However, Figure shows that leaching is not yet complete after 3 hours. This means that the reaction rate is not dependent on the acid concentration. However, the same concentration ratio 𝐶 𝑖 * means a linearly increase of Mg 2+ with the mass concentration in the suspension. Three times the amount of particles also corresponds to three times the amount of dissolved magnesium after 3 hours. This behavior is reflected in both anhydrite and talc. Therefore, there is a proportional behavior between the mass concentration of particles and the amount of magnesium leached, whereas the acid concentration shows no dependence on the leaching rate. Whether the leached magnesium ion concentration in the steady state is dependent on the amount of acid needs to be investigated in a further study.