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| 钢渣在海洋中无机固碳行为及其应用 |
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柯盛1,2, 连靖3, 梁可安3, 黄家添3, 肖永贤3, 张际标1,3, 陈春亮1,2
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1.广东海洋大学 海洋资源与环境监测中心, 广东 湛江 524088;2.广东海洋大学 分析测试中心, 广东 湛江 524088;3.广东海洋大学 化学与环境与学院, 广东 湛江 524088
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| 摘要: |
| 钢渣是钢铁生产过程中的副产物,是一种放错的资源。钢渣投放在水体中可显著提升水体pH值,并能吸收大量的CO2。为了解钢渣投放在海洋中可能引起的pH变化及其无机固碳能力,本研究考察了不同粒径、钢渣含量、初始pH及是否扰动等条件下钢渣/海水的pH变化特征和固碳能力。结果表明,不同条件下的钢渣/海水体系,随着浸泡时间的延长,浸出液pH初期都快速升高,后期趋于平缓,且钢渣粒径越小、投入钢渣含量越多及外加振荡作用,都可使浸出液pH提升;同时,浸出液能维持的pH水平对钢渣/海水体系固碳效率影响较大,而钢渣粒径的大小是钢渣固碳能力的最直接影响因素。本工作结果还表明,在实海环境中投放一定量的钢渣有助于预防局部水体酸化,并起到固碳减排的目的。 |
| 关键词: 钢渣 海水 浸出特征 固碳能力 |
| DOI：10.11759/hykx20210624001 |
| 分类号:P76 |
| 基金项目:广东省科技计划项目(2016A020225004);广东海洋大学大学生创新创业训练计划项目(CXXL2019306) |
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| Inorganic carbon fixation behavior of steel slag in seawater and its application in coastal environments |
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KE Sheng1,2, LIAN Jing3, LIANG Ke-an3, HUANG Jia-tian3, XIAO Yong-xian3, ZHANG Ji-biao1,3, CHEN Chun-liang1,2
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1.Monitoring Center of Marine Resources and Environment, Guangdong Ocean University, Zhanjiang 524088, China;2.Analytical and Testing Center, Guangdong Ocean University, Zhanjiang 524088, China;3.College of Chemistry and Environmental Science, Guangdong Ocean University, Zhanjiang 524088, China
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| Abstract: |
| Steel slag is an underutilized resource that is produced as a by-product of the steelmaking process. When steel slag is added to water, it significantly increases the pH level and absorbs a substantial amount of CO2. The pH change characteristics and carbon fixation capacity in the steel slag/seawater system were investigated under different conditions such as particle size, steel slag content, initial pH, and external force disturbance to understand the environmental feasibility of steel slag application in coastal environments. The results show that under different conditions, the pH of the slag/seawater system increases rapidly in the initial stage and tends to stabilize as immersion time increases. The pH increase of the leaching solution was mainly due to particle size, steel slag content, initial pH, and external force disturbance. Furthermore, the carbon fixation efficiency in the steel slag/seawater system is influenced by the pH level that can be maintained by the leaching solution, and the particle size of steel slag is the most direct factor affecting its carbon fixation ability. The results of this work also show that dumping a specific amount of steel slag into the real sea environment can help prevent the local acidification of seawater while achieving the goals of carbon fixing and emission reduction. Therefore, the application of steel slag in the coastal environment is feasible from an environmental protection perspective. |
| Key words: steel slag seawater leaching characteristics carbon fixation capacity |