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Release of toxic gases in the process of cemented backfill with phosphorus waste

全磷废料在矿山充填过程中有害气体的释放特性

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Abstract

Aiming at the practical problem of toxic gases generated in the process of cemented backfill with phosphorus waste (phosphogypsum as aggregate and yellow phosphorus slag as the binder), sources and dynamics of gas generation and the method of gas inhibition were investigated by monitoring the gas generated in the aggregate, the binder and the cemented slurry stirring process. The main findings proved that the gases were mainly generated from the binder in an acidic circumstance, and the gas generation sequence is PCl3, PH3, NO, H2S, NH3, and CO. Furthermore, lowering the pH value of the cemented slurry would increase the gas yield. The original gas yield of the slurry without acid addition was only 6.3% of the maximum gas yield after acid addition. By analyzing the circumstances of gas generation, a method of directly adding alkaline CaO to the slurry to control the gas generation was proposed. The addition of 12 wt% CaO was noted to reduce the gas yield by 99%. When the pH of the backfill slurry reached 10, the gas generation could be controlled. The results have implications for ensuring the health of mining workers and decreasing environmental pollution.

摘要

针对全磷废料充填过程中产生有害气体的实际问题,通过监测骨料磷石膏(PG)、胶凝剂黄磷渣(YPS)和充填过程中的气体产生情况,探究了气体产生的来源、释放特性以及抑制方法。结果表明,气体主要是在酸性环境下在胶凝剂中产生的,气体产生的先后顺序为PCl3、PH3、NO、H2S、NH3和CO。降低充填浆料的pH值将增加气体产量,未添加酸的浆料原始气体产量仅为外加酸性环境下极限气体产量的6.3%。通过对产气情况的分析,提出了在料浆中直接添加碱性CaO 以控制气体产生的方法。添加胶凝剂质量12%的CaO时,气体产率降低了99%。当充填料浆的pH达到10 以上时,可有效控制气体产生。本研究结果对保障采矿工人的健康和减少环境污染具有一定意义。

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Authors and Affiliations

  1. School of Resources and Safety Engineering, Central South University, Changsha, 410083, China

    Ya-nan Zhou  (周亚楠), **-bing Li  (**夕兵), Chen-di Min  (闵晨笛), Yun Fan  (范昀), Lei Gan  (甘蕾) & Ying Shi  (石英)

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  1. Ya-nan Zhou  (周亚楠)
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  2. **-bing Li  (**夕兵)
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  6. Ying Shi  (石英)
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Contributions

ZHOU Ya-nan: conceptualization, methodology, data curation and writing-original draft; LI **-bing: writing-review and editing, and supervision; MIN Chen-di: writing-review and editing, methodology. FAN Yun: Writing-review and editing, and validation; GAN Lei: Writing-review and editing, and formal analysis; SHI Ying: Writing-review and editing, and funding acquisition.

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Correspondence to Ying Shi  (石英).

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Conflict of interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Foundation item: Projects(42177160, 72088101, 11972378) supported by the National Natural Science Foundation of China; Project (CX20220103) supported by the Postgraduate Scientific Research Innovation Project of Hunan Province, China; Project (2022ZZTS0012) supported by the Fundamental Research Funds for the Central Universities, China

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Zhou, Yn., Li, Xb., Min, Cd. et al. Release of toxic gases in the process of cemented backfill with phosphorus waste. J. Cent. South Univ. 30, 202–213 (2023). https://doi.org/10.1007/s11771-023-5236-5

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