Studies on Analysis Conditions of Specific Surface Area of Polymetallic Nodules

LI Hao-nan; REN Xiang-wen; SONG Zhao-jun; LI Huai-ming; WANG Wen-yu

doi:10.15898/j.cnki.11-2131/td.202008140114

2021 Vol. 40, No. 3

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Article navigation > Rock and Mineral Analysis > 2021 > 40(3): 435-443

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LI Hao-nan, REN Xiang-wen, SONG Zhao-jun, LI Huai-ming, WANG Wen-yu. Studies on Analysis Conditions of Specific Surface Area of Polymetallic Nodules[J]. Rock and Mineral Analysis, 2021, 40(3): 435-443. doi: 10.15898/j.cnki.11-2131/td.202008140114

Citation:

LI Hao-nan, REN Xiang-wen, SONG Zhao-jun, LI Huai-ming, WANG Wen-yu. Studies on Analysis Conditions of Specific Surface Area of Polymetallic Nodules[J]. Rock and Mineral Analysis, 2021, 40(3): 435-443. doi: 10.15898/j.cnki.11-2131/td.202008140114

Studies on Analysis Conditions of Specific Surface Area of Polymetallic Nodules

1.
College of Geoscience and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
2.
Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266237, China
3.
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China
4.
Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310112, China

More Information

Corresponding author: REN Xiang-wen, renxiangwen@163.com

Received Date: 14 August 2020

Revised Date: 21 September 2020

Accepted Date: 06 March 2021

Publish Date: 28 May 2021

Abstract

Abstract

BACKGROUND
Polymetallic nodules are predominant in deep sea sedimentary mineral resources due to the enrichment of many critical metals. Polymetallic nodules are loose and porous, which is the critical material feature that contributes the adsorption of trace metals from seawater and pore water and then enrichment and mineralization. Therefore, specific surface area (SSA) is one of the key factors for studying the ore-forming process of polymetallic nodules. At present, the methods for SSA determination are well-developed. However, they are less applied in the analysis of the specific surface of polymetallic nodules, and the pretreatment conditions are not constant according to various research targets.
OBJECTIVES
In order to explore the pretreatment conditions for the BET SSA analysis of polymetallic nodules, and provide necessary parameters for the study of the enrichment of trace metals in polymetallic nodules.
METHODS
Polymetallic nodules from the Atlantic, Indian, and Pacific oceans were collected. The pretreatment conditions including temperature, duration, and particle size for SSA analysis of polymetallic nodules were studies by applying temperature programming, heating accumulation, and particle size comparing methods.
RESULTS
The results showed that the analysis values of SSA reached plateau when the heating temperature ranged from 210℃to 350℃. The analysis values of SSA remained constant after heating for 3 hours by a step of 1 hour at 210℃. The SSA values of samples with a size of several millimeters were 1.027-28.535m²/g higher compared with those of the same samples crushed into microns.
CONCLUSIONS
Reliable SSA values can be obtained when the polymetallic nodules with sizes of several millimeters are heated in a vacuum system for 3 hours at 210℃, which is the pretreatment condition for analyzing SSA of mineralization-related polymetallic nodules.
- polymetallic nodules /
- specific surface area /
- pretreatment conditions /
- particle size

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