The dispersive effect of sodium silicate on kaolinite particles in process water: implications for iron-ore processing

Abstract Moisture is a critical variable in iron-ore processing, handling and transportation. During beneficiation, excessive moisture may lead to screen and chute clogging. In transportation, moisture values above transportable moisture limit may cause cargo instabilities, especially in regard to vessels. Moisture is a non-stationary variable that depends on spatial and time distributions. Therefore, classical estimate methods such as ordinary kriging are not appropriate to calculate moisture values. Here, we present an extension of the Normative Mineralogy Calculation to indirectly estimate moisture, considering seasonal influence. This study in based on three iron-ore mines, Galinheiro, Pico and Sapecado. They are located in the Quadrilátero Ferrífero of Minas Gerais, Brazil, a world-class iron-ore district. The method proposed herein provides useful information that can be applied elsewhere. Our results indicate that compact ores show low moisture values with little seasonal influence, while soft ores and canga (iron-rich duricrust) are strongly influenced seasonally due to higher porosity and greater capacity of retaining water in the crystal structure of minerals, such as goethite. Moisture variations may exceed 2% along the year. Such variations are enough to preclude the beneficiation of certain iron ores during the rainy season. For this reason, moisture has been regarded as an essential variable in short-term mining. Article Highlights Moisture is a critical variable in iron-ore processing, handling and transportation. Moisture depends on spatial and time distributions; hence classical methods are not appropriate to quantitatively estimate it. This study proposes an indirectly estimate of moisture considering seasonal influence. Compact iron ores are little influenced seasonally, while soft iron ores and canga (duricrust) are strongly affected by the rainy season due to their higher porosity and greater capacity of retaining water. The seasonal effect on moisture is an essential variable that must be consider to better effectiveness of iron-ore mining sequencing and beneficiation.

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Excavations of Two Iron Processing Sites at Scabgill and Boghall, Clydesdale, 1991

Glasgow Archaeological Journal ◽

10.3366/gas.1998.21.21.53 ◽

1998 ◽

Vol 21 (1) ◽

pp. 53-60

Author(s):

R J Strachan ◽

J E Hamilton ◽

I Armit ◽

I B M Ralston

Keyword(s):

Iron Ore ◽

Low Grade ◽

Iron Ores ◽

Medieval Period ◽

Iron Ore Processing ◽

Ore Processing ◽

Small Furnace ◽

Pipeline Project ◽

Processing Site

Summary Excavations were carried out on two sites containing traces of iron ore processing, as part of the N-W Ethylene Pipeline Project, funded by Shell Chemicals UK Ltd. The excavations at Scabgill revealed a small part of an iron ore processing site apparently dating to the later medieval period or earlier. At nearby Boghall, a small furnace was excavated, which, while not itself datable, was also used in the processing of low grade, bog iron ores.

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Modern trends of technological advancement in iron ore processing

Gornyi Zhurnal ◽

10.17580/gzh.2021.11.10 ◽

2021 ◽

pp. 75-83

Author(s):

T. I. Yushina ◽

E. L. Chanturia ◽

A. M. Dumov ◽

A. V. Myaskov

Keyword(s):

Iron Ore ◽

Technological Advancement ◽

Iron Ore Processing ◽

Ore Processing

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