Investigation of water-soluble ions removal through enhanced heat exchange based on cloud-air-purifying technology

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-03-19 DOI:10.1016/j.powtec.2025.120950

Haoyuan Xue, Qing Lv, Yuxiang Liu, Kunyan Fu, Yi Wei, Yumeng Zhang, Bo Wang

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引用次数: 0

Abstract

Pyrometallurgical processes are often accompanied by substantial particle emissions. These particles are ultra-fine and composed of water-soluble ions, making them challenging to effectively remove with existing dust removal equipment. To address this, this study focused on a pyrometallurgical plant in Northwest China, where particle matter emissions from the Kaldo furnace were monitored and analyzed. Based on particles characteristics, studies were conducted to develop process improvements. Firstly, field monitoring studies revealed that the particles at the Kaldo furnace outlet exhibited a bimodal distribution, with one peak consisting of metal particles around 0.6 μm in size. During the wet treatment, these metal particles are converted into water-soluble ions, leading to the wet electrostatic precipitator's removal efficiency of only 53.80 %. Furthermore, a new technology for fine particles removal was introduced, which called Cloud-Air-Purifying (CAP) technology. In CAP, through the effect of heterogeneous condensation, fine particles grow and were then collected in a supergravity field. Results indicated that CAP technology significantly improved overall particle removal efficiency, reaching 91.77 %. However, the average removal efficiency for water-soluble ions was 79.93 %. Subsequently, to improve the water-soluble ions' removal efficiency, theoretical calculations on nucleation rate and removal efficiency were performed. A strategy for enhancing nucleation by improving heat exchange was then established. After determining the temperature drop, long-term monitoring results showed that the upgraded system significantly improved the removal efficiency of water-soluble ions to 99.39 %. The heat-exchange cooling enhanced CAP technology successfully addressed the challenge of controlling water-soluble ions, providing theoretical support for wet dust removal technologies.

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.