The Removal of Impurities from Domestic Graphite Concentrate by H2SO4 Solution and NaOH Solution Leaching

Junseop Lee; Kyoungkeun Yoo; Hyunkyoo Park

doi:10.7844/kirr.2023.32.3.38

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2023 Vol.32, Issue 3 Preview Page Next Page

Research Paper

The Removal of Impurities from Domestic Graphite Concentrate by H₂SO₄ Solution and NaOH Solution Leaching 황산용액과 수산화나트륨용액의 침출에 의한 국내산 흑연 정광으로부터 불순물 제거

30 June 2023. pp. 38-44

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Abstract

Leaching tests were conducted using sulfuric acid and sodium hydroxide solutions to remove impurities from domestic graphite concentrate. As a result of the leaching experiment using sulfuric acid solution and sodium hydroxide solution, respectively, the difference of removal efficiency was insignificant when the concentration of sodium hydroxide or sulfuric acid was 2 mol/L or more. The fixed carbon content increased with increasing the temperature in the sulfuric acid solution leaching, while it remains constant above 150°C in sodium hydroxide solution. For the repeated sequential leaching tests, the leaching conditions were 2 mol/L NaOH, 200°C, 1 hour in the sodium hydroxide solution leaching and 2 mol/L H₂SO₄, 100°C, 1 hour in the sulfuric acid solution leaching, respectively. When sulfuric acid leaching followed by sodium hydroxide solution leaching was repeated 5 times, the fixed carbon increased to 99.95% and ash content decreased to 0.048%, while the fixed carbon increased to 99.98% and ash content was reduced to 0.018 when sodium hydroxide solution leaching followed by sulfuric acid solution leaching was repeated 5 times.

Keywords

graphite concentrate

sulfuric acid solution

sodium hydroxide solution

sequential leaching

국내산 흑연정광으로부터 불순물을 제거하기 위해 황산용액 및 수산화나트륨용액을 이용하여 침출실험을 진행하였다. 황산용액과 수산화나트륨용액을 각각 사용하여 침출실험을 진행한 결과, 수산화나트륨과 황산의 농도가 2 mol/L 이상에서 제거효과의 차이가 미미하고, 황산용액침출에서 온도가 증가함에 따라 고정탄소함량이 증가하는 것에 비해 수산화나트륨용액에서는 150°C 이상에서 큰 차이가 나타나지 않았다. 수산화나트륨용액침출은 2 mol/L NaOH, 200°C, 1시간의 조건으로 선정하고, 황산용액침출은 2 mol/L H₂SO₄, 100°C, 1 시간의 조건으로 선정하여 5회까지 반복하여 침출을 진행하였다. 황산용액침출 후 수산화나트륨용액침출을 5회 반복했을 때 고정탄소는 99.95 %까지 증가하였고, 회분은 0.048 %까지 감소하였다. 수산화나트륨용액침출 후 황산용액침출을 5회 반복한 결과, 고정탄소는 99.98 %, 회분은 0.018까지 감소하여 수산화나트륨용액 침출 후 황산용액침출을 수행한 결과가 다소 높게 나타났다.

키워드

흑연정광

황산용액

수산화나트륨용액

연속침출

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Information

Publisher :The Korean Institute of Resources Recycling
Publisher(Ko) :한국자원리싸이클링학회
Journal Title :Resources Recycling
Journal Title(Ko) :자원리싸이클링
Volume : 32
No :3
Pages :38-44
Received Date : 2023-06-08
Revised Date : 2023-06-16
Accepted Date : 2023-06-19
DOI :https://doi.org/10.7844/kirr.2023.32.3.38

Resources Recycling ISSN:2765-3439(Print) 2765-3447(Online) 자원리싸이클링

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