Harmless process of organic matter in organosilicon waste residue by fluidization-like DDBD reactor: Temperature action and mechanism

Wang, Guanjie; Ye, Zhiping; Dong, Shuhan; Wang, Jiade

doi:10.1016/j.chemosphere.2023.138116

Cited by 5 publications

(2 citation statements)

References 30 publications

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“…Approximately 90% of organosilicon monomers in the market are synthesized directly through the Rochow-Müller process, using chloromethane and industrial Si [6][7][8]. However, the production of organosilicon monomers results in a substantial generation of Si-containing solid waste, primarily composed of high-boiling-point residues, unreacted Si powder, copper powder, and other constituents carried out by fluidized beds [9,10]. Disposing of or incinerating these solid wastes directly not only leads to heavy metal pollution in the soil and groundwater, including copper, zinc, and tin, but also generates strong acid mist and liquid during combustion, causing secondary environmental pollution.…”

Section: Introductionmentioning

confidence: 99%

The Direct Alloying of Steel through Silicothermic Self-Reduction of Chromite Ore Utilizing Si-Containing Solid Waste

Chen,

Xue,

Song

2024

Metals

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Organosilicon materials generate copious amounts of Si-containing solid waste during production, leading to severe environmental pollution and substantial resource squandering. In pursuit of the resource utilization of Si-containing solid waste, this study conducted experimental research on the direct alloying of molten steel through the silicothermic self-reduction of chromite ore using Si-containing solid waste as a reducing agent. Additionally, thermodynamic analysis was performed, employing the thermodynamic calculation software FactSage 8.2 (Thermfact Ltd., Montreal, QC, Canada and GTT-Technologies, Aachen, Germany), to examine the equilibrium reactions of the silicothermic reduction of chromite ore and the variations in the thermodynamic equilibrium compositions of slag and metal phases. The results indicate a reduction sequence for the reducible components in chromite ore as Fe2O3 → Cr2O3. The introduction of CaO and Al2O3 into the silicothermic self-reduction compacts altered the forms of Fe and Cr oxides in equilibrium, significantly reducing the standard Gibbs free energy (ΔG0) of the silicothermic reduction reaction. The initial slag melting point decreased from 1700 °C without the addition of CaO and Al2O3 to 1500 °C with the addition of CaO and Al2O3. Correspondingly, the slag viscosity at 1600 °C decreased from 134.1 Pa·s without CaO and Al2O3 addition to 1.81 Pa·s with CaO and Al2O3 addition. The addition of CaO and Al2O3 accelerated the reduction of Cr oxide in chromite ore and enhanced the recovery of Cr, consistent with the thermodynamic calculation results. In the process of steelmaking through the direct alloying of chromite ore silicothermic self-reduction compacts, the final recovery rate of Cr increased from 86.4% without CaO and Al2O3 addition to 95.4% with CaO and Al2O3 addition.

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Section: Introductionmentioning

confidence: 99%

The Direct Alloying of Steel through Silicothermic Self-Reduction of Chromite Ore Utilizing Si-Containing Solid Waste

Chen,

Xue,

Song

2024

Metals

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“…However, the current methods for treating organosilicon slag are inadequate, with most companies opting for landfill storage or open-air storage. These methods not only cause environmental pollution but also result in a considerable loss of valuable resources [20]. Acid leaching is another treatment method used to extract copper from copper-silicon catalysts; however, the process results in environmental pollution [21].…”

Section: Introductionmentioning

confidence: 99%

Purification of Organosilicon Waste Silicon Powder with Hydrometallurgy

Zhao

et al. 2023

Metals

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Waste silicon powder produced during the production process of organosilicon materials is a major environmental concern that can lead to pollution and resource wastage. As a result, it is crucial to find efficient ways of recovering and utilizing this waste material. In this study, the morphology of waste silicon powder was systematically studied, and an optimized purification method was proposed based on a hydrometallurgical process and phase analysis. The complex composition of waste silicon powder presents a significant challenge during its recycling. However, the results of this study showed that metal-assisted chemical etching (MACE), followed by mixed acid system leaching, is the most effective method for removing impurities from the material. The superior order of different acid systems for removing metallic impurities was HCl < HF < HF + HCl < HF + H2O2 < CuACE. It is worth noting that CuACE treatment has a remarkable ability to remove more than 95% of Fe through hydrometallurgy.

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Study on the Purification Process of Waste Silicon Powder in the Synthesis Process of Organosilicon Monomer

Cai,

Wu,

Wei

et al. 2023

Silicon

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Harmless process of organic matter in organosilicon waste residue by fluidization-like DDBD reactor: Temperature action and mechanism

Cited by 5 publications

References 30 publications

The Direct Alloying of Steel through Silicothermic Self-Reduction of Chromite Ore Utilizing Si-Containing Solid Waste

The Direct Alloying of Steel through Silicothermic Self-Reduction of Chromite Ore Utilizing Si-Containing Solid Waste

Purification of Organosilicon Waste Silicon Powder with Hydrometallurgy

Study on the Purification Process of Waste Silicon Powder in the Synthesis Process of Organosilicon Monomer

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