Co-treatment of copper smelting flue dust and arsenic sulfide residue by a pyrometallurgical approach for simultaneous removal and recovery of arsenic
| Autor: | Liu Xia, Jun Chen, Zhang Wenjuan, Chengyan Wang, Baozhong Ma, Peicheng Wen, Jianyong Che |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Health Toxicology and Mutagenesis 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology 010501 environmental sciences Sulfides 01 natural sciences Arsenicals Arsenic chemistry.chemical_compound Hazardous waste Environmental Chemistry Waste Management and Disposal Flue 0105 earth and related environmental sciences Roasting Pollutant 021110 strategic defence & security studies Arsenate Sulfuric acid Dust Pulp and paper industry Pollution chemistry Arsenic sulfide Copper |
| Zdroj: | Journal of hazardous materials. 416 |
| ISSN: | 1873-3336 |
| Popis: | As the typical hazardous arsenic pollutants, copper smelting flue dust (CSFD) and arsenic sulfide residue (ASR) are produced extensively during copper smelting process, which pose significant pressure on environmental protection and green development of the copper industry. This work proposed an economic, efficient, and applicable approach to treat waste with waste, in which the simultaneous removal and recovery of As from CSFD and ASR were realized by a roasting process, with adding sulfuric acid, at a relatively low temperature (300–350 ℃). The thermodynamic analysis and experiments confirmed that the main phases of As2S3 and S0 in the ASR were used as a reductant for reducing As(Ⅴ) in the CSFD, and the introduction of sulfuric acid favorably enhanced the thermodynamic driving force and greatly lowered the reaction temperature. The results indicated that removal and behavior of As were highly dependent on the mass ratio of ASR to CSFD, roasting temperature, and H2SO4 dosage. By regulating the parameters, the species As2S3, As2O5, and arsenate were all converted to volatile As2O3, which could be captured and deposited in cold water. In the optimized co-treatment, a satisfied As removal efficiency of 96.12% was achieved, while getting the 97.03% pure As2O3. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect