论文部分内容阅读
从Na_3SbS_3—Na_2S—NaOH 溶液中电沉积锑的工艺,已在国内应用于生产。本文是这一研究工作的一部分。内容包括:(1)由Ⅰ—Ⅴ曲线法确定了Na_3SbS_3的分解电压为1.72伏,并由阴、阳极极化曲线的数据进行了核对。(2)在30安培扩大实验电解槽上进行了槽电压平衡测定。(3)经红外光谱及X—射线分析表明:阳极钝化膜的成分及结构为β—FeOOH,Fe_3O_4,γ—Fe_2O_3和FeSO_4·7H_2O。由于尖晶石型γ—Fe_2O_3和固态FeSO_4均为电的不良导体,使阳极电压降在整个槽电压中约占1/5—1/4。文中指出:在隔膜电解条件下,当采用铁质材料作为不溶阳极时,为了减少电积锑的电能消耗,宜采用较低的阳极电流密度。同时,为了减少阳极上FeSO_4的生成,宜选择有效的阳极隔膜材料,以防止S~(2-)离子由阴极液向阳极液的迁移。
The process of electrodepositing antimony from Na_3SbS_3-Na_2S-NaOH solution has been applied in domestic production. This article is part of this research. The contents include: (1) According to Ⅰ-Ⅴ curve method, the decomposition voltage of Na_3SbS_3 is 1.72V, and the data of the anodic and cathodic polarization curve are checked. (2) Slot voltage balance measurement was performed on a 30 amp expansion experiment cell. (3) The results of FTIR and X-ray analysis showed that the composition and structure of anodic passive film were β-FeOOH, Fe 3 O 4, γ-Fe 2 O 3 and FeSO 4 · 7H 2 O. Since the spinel-type γ-Fe_2O_3 and solid-state FeSO_4 are all poor conductors of electricity, the anode voltage drop accounts for about 1 / 5-1 / 4 of the total cell voltage. In the paper, it is pointed out that under the condition of membrane electrolysis, when the iron material is used as the insoluble anode, a lower anode current density should be adopted in order to reduce the energy consumption of the electrosurgical antimony. At the same time, in order to reduce the formation of FeSO_4 on the anode, an effective anode separator should be chosen to prevent the migration of S_2- ions from the catholyte to the anolyte.