Optimization studies in sulfuric acid production

Kiss, Anton A.; Bîldea, Costin Sorin; Verheijen, P.J.T.

doi:10.1016/s1570-7946(06)80133-1

Cited by 12 publications

(4 citation statements)

References 1 publication

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“…Interestingly, the distribution of SO 2 concentration was parabolic, and the concentration of SO 2 in the flue gas was 0∼8.26%. Hence, SO 2 could be collected for sulfuric acid production through purification of SO 2 , conversion of SO 2 , and absorption of SO 3 when it met the requirements that the concentration of SO 2 in the gas reached 3% [28,29].…”

Section: Effect Of Air Flowmentioning

confidence: 99%

Innovative Methodology for Sulfur Release from Copper Tailings by the Oxidation Roasting Process

Luo

Peng

Sun

2020

Journal of Chemistry

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To effectively prevent the accumulation of copper tailings from producing acid mine drainage (AMD) and maximize the comprehensive utilization of copper tailings, the process of oxidation roasting was adopted to release sulfur in the form of SO2 to achieve the purpose of sulfur recovery later. Based on the AMD risk assessment, thermogravimetric (TG) analysis, and differential scanning calorimeter (DSC) analysis, the influences of roasting temperature, residence time, and air flow in the roasting process were investigated. The thermal stability, reaction equilibrium, mineral transformation, and residual S content were characterized by TG-DSC, HSC chemical software 6.0, X-ray diffraction (XRD), and combustion neutralization, respectively. The optimum conditions for sulfur release in the roasting process were shown with a temperature of 1200°C, a residence time of 60 min, and an air flow of 0.8 L/min. Under these conditions, the sulfur release rate was 99.82%, and the residual S content was 0.05%. Subsequently, the process of sulfur release was proposed as four steps: oxidative decomposition of pyrrhotite, formation of ferric sulfate, decomposition of ferric sulfate, and formation of hematite. All of the findings could propose a theoretical and experimental reference for the recovery of the sulfur component from tailings rich in sulfide minerals.

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Section: Effect Of Air Flowmentioning

confidence: 99%

Innovative Methodology for Sulfur Release from Copper Tailings by the Oxidation Roasting Process

Luo

Peng

Sun

2020

Journal of Chemistry

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“…For calculations, we assumed that [14]: • The performance of the double absorption column method was 100%;…”

Section: Calculating the Amount Of Regenerated Sulfur Dioxidementioning

confidence: 99%

A New Industrial Hydrogen Production Process

Meddeb¹,

Hajjem²,

Mabrouk³

et al. 2015

GSC

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This study was proposed to develop a new method for hydrogen production in significant amounts. It consisted in using sulfur dioxide (SO 2), and discharged from the sulfuric acid (H 2 SO 4) production unit. This process could be considered as an alternative to many classical processes for air quality treatment resulting in as afer environment. Furthermore, it was an innovative method for hydrogen production. In fact, SO 2 was fed into a PEM electrolyzer stack. The dissolved SO 2 was oxidized at the anode which led to the production of sulfuric acid; whereas, hydrogen (H 2) was produced at the cathode. This new method was able to treat 3.7 t/day of SO 2 in order to produce 0.116 t/day of hydrogen and recover 5.6 t/day of 35 wt.% H 2 SO 4. Results showed that the studied procedure was more economical in terms of energy consumption than the Westinghouse hybrid process. Hence, 67% of the energy needed for the decomposition step was reduced by our proposed process. After the presentation of the principles of the new process design, each part of the process was sized. The calculations showed that the number of electrolyzers could be calculated using the same formula used for the number of electrolyzers for water electrolysis or flux cell.

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“…For example, if the inlet SO 2 concentration to the converter were 9% by volume (a representative value), and the conversion temperature was 430 8C (806 8F), the conversion efficiency would be 98%. At this conversion, the uncontrolled emission factor for SO 2 would be 13 kg [24].…”

Section: Sulphur Dioxide Emissionsmentioning

confidence: 99%