硫酸盐在铁硫酸盐介质中的相转换特征
Pu Sun1, Jibo Wang1, Xingbin Li1
1Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China.
Journal of hazardous materials
|November 21, 2024
概括
硫酸 (PbSO4) 转化为石 (Pb-J) 是对温度和硫酸 (H2SO4) 度敏感的. 铁酸铁 (Fe3+) 有助于Pb-J的形成,而和硫酸盐则会抑制它.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 矿物加工 矿物加工
背景情况:
- 硫酸 (PbSO4) 是水力金工艺中的一个关键中间体,特别是在硫化矿石浸过程中.
- 了解PbSO4相变化对于优化金属回收和工艺效率至关重要.
研究的目的:
- 为了研究硫酸 (PbSO4) 在硫酸 (H2SO4) 系统中的相转换特性.
- 为了确定温度,H2SO4度,Fe3+,Na2SO4和K2SO4对PbSO4转化为jarosite的影响.
主要方法:
- 使用X射线衍射 (XRD),扫描电子显微镜与能量分散式X射线光谱 (SEM/BSE-EDS) 和富里埃变形红外光谱 (FT-IR) 研究了相变.
- 实验对温度,H2SO4度,Fe3+度以及Na2SO4和K2SO4的存在进行了变化.
主要成果:
- SO4转化为焦石 (Pb-J) 是取决于温度和受H2SO4度的影响,在降低酸度时的值较低.
- 高度的H2SO4 (>40 g/L) 抑制了PbSO4的转化,而低pH (<0.3) 抑制了石的产生.
- Fe3+促进了Pb-J的形成,而Na2SO4和K2SO4则抑制了它,导致Na-J和K-J的形成.
结论:
- 硫酸度和温度是控制PbSO4转化为石的关键因素.
- 铁酸铁,硫酸和硫酸的存在显著影响了jarosite的物种化和形成.
- 这些发现为控制硫化物矿石氧气压力漏过程中的PbSO4转化提供了洞察力.
相关概念视频
Time and frequency -Domain Interpretation of Phase-lead Control
76
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
76
Factors Affecting Solubility
33.1K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.1K
Extraction: Advanced Methods
420
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
420
Ladder Diagrams: Redox Equilibria
437
Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
437
Solubility Equilibria
52.1K
Solubility equilibria are established when the dissolution and precipitation of a solute species occur at equal rates. These equilibria underlie many natural and technological processes, ranging from tooth decay to water purification. An understanding of the factors affecting compound solubility is, therefore, essential to the effective management of these processes. This section applies previously introduced equilibrium concepts and tools to systems involving dissolution and precipitation.
The...
The...
52.1K
Precipitation and Co-precipitation
1.7K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
1.7K


