利用选择性浸出和沉淀从高磷钢渣中提取磷

杜传明1,2,于耀辉1,袁磊1,于景坤1,北村信也2

钢铁研究学报 ›› 2020, Vol. 32 ›› Issue (7) : 571-576.

钢铁研究学报 ›› 2020, Vol. 32 ›› Issue (7) : 571-576. DOI: 10.13228/j.boyuan.issn1001-0963。20200049
冶炼与加工

利用选择性浸出和沉淀从高磷钢渣中提取磷

  • 杜传明,于耀辉,袁磊,于景坤,北村信也
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Extraction of phosphorus from high-P2O5 steelmaking slag using selective leaching and precipitation

  • DU Chuan-ming,YU Yao-hui,YUAN Lei,YU Jing-kun,KITAMURA Shin-ya
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摘要

摘要:使用高磷铁矿石冶炼所产生的高磷钢渣被视为一种磷资源。为了回收高磷钢渣中的磷,研究采用了选择性浸出和沉淀的方法,对不同P2O5含量的高磷钢渣进行了研究。结果表明:高磷钢渣中P2O5主要富集在2CaO·SiO2-3CaO·P2O5固溶体中;pH值为5.0时高磷钢渣中大部分固溶体被溶解分离,磷溶出率超过81.0%,而铁溶出率低于6.0%,实现了选择性浸出;浸出后的低磷残渣可作为冶金熔剂循环使用;升高浸出液pH值后,磷酸根离子形成沉淀;回收的沉淀物中P2O5质量分数达到23.9%,可作为磷肥使用。通过本工艺,高磷钢渣中磷能被有效分离及提取,实现了资源化利用。

Abstract

Abstract: The high P2O5 steelmaking slag generated from utilization of highP iron ore is considered as a phosphorus resource. To recover phosphorus from highP2O5 steelmaking slag, a process of selective leaching and precipitation was adopted, and steelmaking slags with various P2O5 contents were investigated. The results show that P2O5 is mainly concentrated in the 2CaO·SiO2-3CaO·P2O5 solid solution. Most of the solid solution from highP2O5 steelmaking slag is dissolved at pH 5. The dissolution ratio of P exceeds 81%, and that of Fe is less than 6%, achieving selective leaching. After leaching, the lowP residue can be reutilized as a metallurgical flux. When the pH increases, the phosphate ions in the leachate form precipitates. The obtained precipitate containing 23.9 mass% P2O5 can be used as a fertilizer. Through this process, the phosphorus in highP2O5 steelmaking slag can be effectively separated and extracted, realizing its resource utilization.

关键词

关键词:钢渣 / 浸出 / 固溶体 / 磷回收

Key words

Key words: steelmaking slag / leaching / solid solution / phosphorus recovery

引用本文

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杜传明1,2,于耀辉1,袁磊1,于景坤1,北村信也2. 利用选择性浸出和沉淀从高磷钢渣中提取磷[J]. 钢铁研究学报, 2020, 32(7): 571-576 https://doi.org/10.13228/j.boyuan.issn1001-0963。20200049
DU Chuan-ming1,2,YU Yao-hui1,YUAN Lei1,YU Jing-kun1,KITAMURA Shin-ya2. Extraction of phosphorus from high-P2O5 steelmaking slag using selective leaching and precipitation[J]. Journal of Iron and Steel Research, 2020, 32(7): 571-576 https://doi.org/10.13228/j.boyuan.issn1001-0963。20200049

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