Bi 2 S 3 has a low solubility in an aqueous solution, and its solubility product Ksp = 10 -98.9 . The concentration of Bi 3 + in water is only 10 -20.81 mol ∕ L, while the concentration of Bi 3 + is only 10 -3 mol ∕ L under acidic conditions of pH=0. Therefore, Bi 2 S 3 cannot be leached under conventional acidic conditions. Since Bi 3 + can form a complex with Cl - , such as at 298 K, and the ionic strength I = 2.5 mol ∕ L, it is known from the literature that BiCl 5 2 - and BiCl 6 3 - in the water-soluble solution of the Bi-Cl - system are Mainly, see Figure 1, the cumulative production constants are 10 7.68 and 10 8.04 , respectively. Therefore, under the reaction conditions with Cl - participation, the solubility of Bi 2 S 3 is obviously improved. Yang Xianwan and Deng Lunhao calculated the lg[Bi] T -lg[Cl - ] map at 298K, pH=1 and the lg[Bi] T -pH map of different [Cl - ] (see Figure 2 and Figure 3). It can be seen that as the [Cl - ] in the system increases, the solubility of Bi 2 S 3 increases significantly. From Fig. 3, it can be inferred that the solubility of Bi 2 S 3 in an aqueous solution of 298 K and a NaCl concentration of 3 mol ∕ L and pH = 0 is about 2.1 g ∕L. It can be seen that Bi 2 S 3 has obvious chemical dissolution. (298K, 2.5mol ∕L NaClO 4 , Bi 3 + =10 -4 moll∕L) 1 mating relationship bismuth chloride and chloride ion concentration distribution thereof ([H 2 S]=0.01mol∕L, pH=1) Figure 2 Effect of [Cl - ] on the solubility of Bi 2 S 3 Figure 3 Solubility of Bi 2 S 3 in different concentrations of NaCl aqueous solution (H 2 S saturation) NaCl concentration: 1-1 mol ∕L, 2-2 mol ∕L, 3-3 mol ∕L Figure 2 shows that the presence of a certain amount of chloride ions in the solution is a very important condition for the leaching process of the ruthenium material. The fact that the leaching agent has a sufficiently high total chlorine concentration is a prerequisite for ensuring that the leaching system does not produce hydrolysis to achieve good leaching. Figure 3 shows that the solubility of hydrazine in the solution increases sharply with decreasing pH, and the increase in acidity of the solution helps to increase the solubility of hydrazine in the solution. Car parts,Silicone Rubber Bushing ,rubber flange stopper plug ,electronic industry,household series,car Fascia Shenzhen Ananda Technology Co.,LTD , https://www.carmitek.com