Separation of silicon and iron in copper slag by carbothermic reduction-alkaline leaching process

Wang, Hongyang; Song, Shaoxian

doi:10.1007/s11771-020-4446-3

Cited by 15 publications

(2 citation statements)

References 25 publications

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“…CS can also be feasibly processed by ammonia solution treatment to yield significant and viable yields of copper [64]. Using microwave treatment to treat CS slag to recover iron at high concentrations is another viable option [65]. For copper and nickel, leaching or flotation is typically used for recovery from CS [33] Botswana used to produce copper from Bamangwato Concession Limited [66], Khoemacau, and Tati Nickel mines.…”

Section: Reuse and Recycling Of Copper Slagmentioning

confidence: 99%

Environmental and Socioeconomic Impact of Copper Slag—A Review

et al. 2021

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Copper slag is generated when copper and nickel ores are recovered from their parent ores using a pyrometallurgical process, and these ores usually contain other elements which include iron, cobalt, silica, and alumina. Slag is a major problem in the metallurgical industries as it is dumped into heaps which have accumulated into millions of tons over the years. Moreover, they pose a danger to the environment as they occupy vacant land (space problems). Over the past few years, studies have been conducted to investigate the copper slag-producing outlets to learn their behavior, as well as properties of slag, to have the knowledge of how to better reuse and recycle copper slag. This review article provides the environmental and socioeconomic impacts of slag, as well as a characterization of copper slag, with the aim of reusing and recycling the slag to benefit the environment and economy. Recycling methods are considered an attractive technological pathway for reducing waste and greenhouse gas emissions, as well as promoting the concept of circular economy through the utilization of waste. These metal elements have value depending on their characteristics; hence, copper slag is considered as a secondary source of valuable metals. Some of the pyrometallurgical and hydrometallurgical processes to consider are physical separation, magnetic separation, flotation, leaching, and direct reduction roasting of iron (DRI). Some of the possible metals that can be recovered from the copper slag include Cu, Fe, Ni, Co, and Ag (precious metals).

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Section: Reuse and Recycling Of Copper Slagmentioning

confidence: 99%

Environmental and Socioeconomic Impact of Copper Slag—A Review

et al. 2021

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“…This demonstrates that the leaching behavior of heavy metals in modified GCS may be affected. On the other hand, the thermal chemical modification of GCS also includes the melting and grinding stage, which inevitably requires energy consumption, affecting the application and promotion of this action method [ 25 ]. There are few studies on the effect of chemical modification on the leaching behavior of GCS and high cement replacement rate composite binders with different CaO content.…”

Section: Introductionmentioning

confidence: 99%

Influence of CaO on Physical and Environmental Properties of Granulated Copper Slag: Melting Behavior, Grindability and Leaching Behavior

Sun

Feng

Wang

et al. 2022

IJERPH

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Due to its potential pozzolanic activity, granulated copper slag (GCS) has been proven to act as a supplementary cementitious material (SCM) after thermochemical modification with CaO. This modification method reduces cement consumption and CO2 emissions; however, the additional energy consumption and environmental properties are also not negligible. This paper aims to evaluate the economics and environmental properties of thermochemically modified GCS with CaO through the melting temperature, grindability, and heavy metal leaching characteristics. The X-ray fluorescence spectroscopy (XRF) results indicated that the composition of the modified GCS shifted to the field close to that of class C fly ash (FA-C) in the CaO-SiO2-Al2O3 ternary phase diagram, demonstrating higher pozzolanic activity. The test results on melting behavior and grindability revealed that adding CaO in amounts ranging from 5 wt% to 20 wt% decreased the melting temperature while increasing the BET surface area, thus significantly improving the thermochemical modification’s economics. The unconfined compressive strength (UCS) of the cement paste blended with 20 wt% CaO added to the modified GCS after curing reached 17.3, 33.6, and 42.9 MPa after curing for 7, 28, and 90 d, respectively. It even exceeded that of Portland cement paste at 28 d and 90 d curings. The leaching results of blended cement proved that the heavy metal elements showed different trends with increased CaO content in modified GCS, but none exceeded the limit values. This paper provides a valuable reference for evaluating thermochemically modified GCS’s economics and environmental properties for use as SCM.

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