Extraction of Phosphorus from Steelmaking Slag by Selective Leaching Using Citric Acid
Extraction of Phosphorus from Steelmaking Slag by Selective Leaching Using Citric Acid
复制标题
柠檬酸选择性浸出炼钢渣中磷的提取
DOI：
10.2355/isijinternational.isijint-2017-658
复制
发表时间：
2018
影响因子：
1.8
通讯作者：
S. Kitamura
中科院分区：
文献类型：
--
作者：
Takayuki Iwama;Chuan;Xu Gao;Sun;S. Ueda,;S. Kitamura
以粒度较粗的钢渣为原料，研究了钢渣中磷的浸出方法。在pH = 3的条件下，用柠檬酸浸出，P2O5的溶出率约为60%，MnO的溶出率小于30%。用P2O5的溶解率除以MnO的溶解率计算出的分离指数为2.1.此外，固溶体的溶解率为90%或更大。然而，25%或更多的基质也溶解。为了提高浸出的选择性，合成了组成基质的矿物相，并研究了它们的浸出行为。结果表明，消除玻璃相和改变铁氧化物中铁的价态为3+对抑制基体溶解是重要的。最后，采用缓冷法制备了仅含Fe2O3的合成渣，并进行了浸出试验。磷的溶解率约为99%，但锰的溶解率不到10%。此外，分离指数提高至14.1。在这种情况下，基质的溶解被抑制，并且几乎所有的固溶体相被溶解。
An approach to leach phosphorus from slag was applied to commercial fertilizers made from steelmaking slag, which has relatively coarse grains. After leaching at pH 3 with citric acid, about 60% of the P 2 O 5 had been dissolved, but the dissolution ratio of MnO was less than 30%. The separation index, calculated from the dissolution ratio of P 2 O 5 divided by that of MnO, was 2.1. In addition, the dissolution ratio of the solid solution was 90% or greater. However, 25% or more of the matrix was also dissolved. To improve the selectivity of leaching, the mineralogical phases comprising the matrix were synthesized, and their leaching behaviors were investigated. The results indicate that it is important to eliminate the glassy phases and to change the valence state of iron in its oxides to 3 + to suppress the dissolution of the matrix. Finally, a synthesized slag, containing only Fe 2 O 3 as the only iron oxide, was prepared by slow cooling, and leaching tests were conducted. About 99% of the P was dissolved, but the dissolution ratio of Mn was less than 10%. In addition, the separation index increased to 14.1. In this case, the dissolution of the matrix was suppressed, and almost all the solid solution phase was dissolved.