扬矿过程中多金属结核破碎粉化特性试验研究  

Experimental Study on Fragmentation and Pulverization Characteristics of Polymetallic Nodules During Lifting

作　　者：刘美麟 夏建新[1] 任华堂[1] LIU Meilin;XIA Jianxin;REN Huatang(School of Life and Environment Sciences,Minzu University of China,Beijing 100081,China)

机构地区：[1]中央民族大学生命与环境科学学院,北京100081

出　　处：《矿冶工程》2024年第1期1-5,11,共6页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(U1906234)。

摘　　要：对扬矿过程中多金属结核破碎粉化特性进行了试验研究。结果表明,扬矿过程中结核破碎程度明显,体积浓度6.5%时,粒径大于50 mm的多金属结核质量占比从75.58%降至23.78%;体积浓度15%时,粒径大于50 mm的多金属结核质量占比从51.51%降至10.08%。试验中结核存在粉化现象,体积浓度6.5%时,粒径小于0.1 mm的多金属结核粉末质量占比为1.79%,粉末中值粒径为10.07μm;体积浓度15%时,粒径小于0.1 mm的多金属结核粉末质量占比为1.99%,粉末中值粒径为9.47μm。基于试验数据估算,采矿1 000万吨多金属结核,粉末排放会造成上万吨Fe、Mn和上百吨Co、Ni、Cu金属损失,其形成的羽流扩散沉降后的最大再沉积厚度大于3 mm,会对环境造成显著影响。Based on the experimental study on fragmentation and pulverization characteristics of polymetallic nodules in the process of ore lifting,it is found that there is obvious fragmentation of nodules during lifting process.With the volume concentration of 6.5%,the mass percent of polymetallic nodules with particle size larger than 50 mm decreases from 75.58%to 23.78%;with the volume concentration of 15%,the mass percent decreases from 51.51%to 10.08%.Pulverization of nodules was observed in the experiment.With the volume concentration of 6.5%,the mass percent of the polymetallic nodules powder with particle size less than 0.1 mm is 1.79%,and the median particle size is 10.07μm;with the volume concentration of 15%,the mass percent of polymetallic nodule powder with particle size less than 0.1 mm is 1.99%,and the median particle size of the powder is 9.47μm.Based on the experimental data,it is estimated that as per mining of 10 million tons of polymetallic nodules,the powder discharge will cause tens of thousands of tons of Fe and Mn losses,as well as hundreds of tons of Co,Ni and Cu losses.Besides,the maximum redeposition thickness of the sediment plume induced by mining is more than 3 mm after diffusion and settlement,which will bring a significant impact to environment.

关 键 词：深海采矿 扬矿 粉化 深海环境 多金属结核 再沉积厚度 

分 类 号：TD807[矿业工程—矿山开采]