低品位萤石制备高纯萤石及纳米级碳酸钙

路倩倩; 韩海生; 孙文娟; 张荥斐; 王维维; 张碧兰; 陈文胜; 邹勤

doi:10.1007/s12613-023-2697-3

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 二校

Qianqian Lu, Haisheng Han, Wenjuan Sun, Xingfei Zhang, Weiwei Wang, Bilan Zhang, Wensheng Chen, and Qin Zou, Preparation of high-purity fluorite and nanoscale calcium carbonate from low-grade fluorite, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-023-2697-3

Cite this article as:

Qianqian Lu, Haisheng Han, Wenjuan Sun, Xingfei Zhang, Weiwei Wang, Bilan Zhang, Wensheng Chen, and Qin Zou, Preparation of high-purity fluorite and nanoscale calcium carbonate from low-grade fluorite, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-023-2697-3

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研究论文

低品位萤石制备高纯萤石及纳米级碳酸钙

1)
中南大学资源加工与生物工程学院, 长沙 410083, 中国
2)
湖南有色郴州氟化学有限公司, 郴州 423000, 中国
3)
包头稀土研究院白云鄂博稀土资源研究与综合利用国家重点实验室, 包头 014030, 中国
4)
湖南柿竹园有色金属有限责任公司, 郴州 423000, 中国

通讯作者:
韩海生 E-mail: hanhai5086@csu.edu.cn

王维维 E-mail: viviw91@163.com

文章亮点

(1) 利用酸浸–浮选工艺高效分离方解石制备高品位萤石

(2) 利用萤石浸出液制备高附加值的纳米碳酸钠，实现方解石的回收和高值化利用

(3) 系统的研究浸出液制备纳米碳酸钙的影响规律，制备性状优良的纳米碳酸钙产品

中文摘要

方解石与萤石的分离是限制低品位萤石浮选提质的关键因素，严重影响萤石精矿的品位和回收率。本文提出了一种新的萤石酸浸–浮选工艺，以难选低品位萤石为原料制备高纯萤石，萤石精矿品位提升至97.26%，同时利用含Ca²⁺的萤石酸浸液制备纳米碳酸钙产品。系统研究浓度、温度及滴定速度对浸出液制备纳米碳酸钙的影响，通过改变工艺条件、添加晶型调控剂，制备得粒径为1.823 μm及1.511 μm的方解石型碳酸钙和无定形碳酸钙。与氯化钙溶液相比，萤石浸出液由于Mn²⁺、Mg²⁺及Fe³⁺的影响可制备出晶型可控且粒径更低的纳米级碳酸钙。本研究将酸浸浮选工艺与纳米级碳酸钙制备工艺相结合，在提高萤石品位的同时回收利用方解石，为细粒嵌布的低品位萤石资源清洁高效利用提供了新思路。

关键词:

Research Article

Preparation of high-purity fluorite and nanoscale calcium carbonate from low-grade fluorite

+ Author Affiliations

1)
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
2)
Hunan Nonferrous Chenzhou Fluoride Chemical Co., Ltd., Chenzhou 423000, China
3)
State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization, Baotou Research Institute of Rare Earths, Baotou 014030, China
4)
Hunan Shizhuyuan Nonferrous Metal Co., Ltd., Chenzhou 423000, China

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

Corresponding authors:
Haisheng Han E-mail: hanhai5086@csu.edu.cn

Weiwei Wang E-mail: viviw91@163.com
Received: 24 March 2023; Revised: 25 June 2023; Accepted: 27 June 2023; Available online: 30 June 2023

Abstract

Abstract

Flotation separation of calcite from fluorite is a challenge on low-grade fluorite flotation that limits the recovery and purity of fluorite concentrate. A new acid leaching–flotation process for fluorite is proposed in this work. This innovative process raised the fluorite’s grade to 97.26% while producing nanoscale calcium carbonate from its leachate, which contained plenty of calcium ions. On the production of nanoscale calcium carbonate, the impacts of concentration, temperature, and titration rate were examined. By modifying the process conditions and utilizing crystal conditioning agents, calcite-type and amorphous calcium carbonates with corresponding particle sizes of 1.823 and 1.511 μm were produced. The influence of the impurity ions Mn²⁺, Mg²⁺, and Fe³⁺ was demonstrated to reduce the particle size of nanoscale calcium carbonate and make crystal shape easier to manage in the fluorite leach solution system compared with the calcium chloride solution. The combination of the acid leaching–flotation process and the nanoscale calcium carbonate preparation method improved the grade of fluorite while recovering calcite resources, thus presenting a novel idea for the effective and clean usage of low-quality fluorite resources with embedded microfine particles.
- fluorite;
- calcite;
- nanoscale calcium carbonate;
- waste recovery

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