Global Slag News

US: Researchers from the University of Southern Florida (USF) testing the resistance to deterioration of cements containing between 30% and 70% of slags of various aluminium oxide (Al₂O₃) and magnesium oxide (MgO) contents when exposed to sulphates have discovered a general decrease in resistance with increased Al₂O₃ content. Real Estate Weekly News has reported that increased MgO was found to increase resistance, especially at 30% slag replacement.

Australia: Harsco Environmental, the environmental division of US-based Harsco Corporation, has announced its partnership with numerous producers and consumers in a pan-industrial steel standards and certification initiative called Responsible Steel. The initiative ‘promotes responsible practice,’ with the aim of improving sustainability in emissions, water usage and community and employee relations. This will include developing circular economic practices, including slag deals with cement plants. Harsco Environmental vice president Cope Willis said, “This collaboration is another step in Harsco’s continuous efforts to lead the steel industry to a more sustainable future.”

Canada/US: Harsco’s Environmental division has invested US$2.3m in Carbicrete, a Canadian technology company developing concrete products made with steel slag for the construction industry. The investment will give Harsco Environmental a Board seat in Carbicrete and has been made in conjunction with a US$1.6m grant from the Government of Canada’s Sustainability Development Technology Canada Foundation and applications to further government grant programs. Harsco’s investment will aid the development of the technology through a demonstration program with support from a commercial concrete block manufacturer as part of a development consortium.

“This investment in innovation is aligned with Harsco’s on-going expansion into environmentally-focused products and services, and we are proud to support the development of this exciting technology,” said Harsco Environmental chief operating officer Russ Mitchell.

Carbicrete is developing a technology that allows the production of concrete without using cement by using steel slag instead. The concrete mix is poured into molds, like conventional concrete, and is then cured using CO₂. During curing, the gas becomes a solid, binding together the slag granules, and giving the concrete its strength. Carbicrete says the process can be implemented in any precast concrete manufacturing plant. It also says that the technology is ‘carbon negative’ because more CO₂ is consumed than emitted during the process.

India: JSW Cement has revised its planned expansion to its 14Mt/yr total installed capacity to 39Mt/yr before 1 January 2023, an increase of 5Mt/yr compared to its initial target of 34Mt/yr by 2020. The figure includes JSW’s 54% subsidiary Shiva Cement’s new 1Mt/yr integrated and 1Mt/yr grinding plant, valued at a total of US$112m. Parth Jindal, JSW Cement managing director, said that the figure had been revised upward because Shiva Cement had become self-sufficient in clinker production, freeing the group’s east Indian cement production from ‘volatile import costs.’

Economic Times has reported that Shiva Cement is set to bring its limestone reserves to 100Mt with the acquisition of the Khatkurbahal mine. The company sources its granulated blast furnace slag from the Odisha steel industry. Production of JSW Cement’s flagship product, JSW Portland Slag Cement (PSC), releases CO2 at a rate of 325kg/Mt compared to between 760kg/Mt and 800kg/Mt for typical Ordinary Portland Cement (OPC).

Brazil: Itaci Cement has purchased 100ha of land in Tabuleiro do Norte in the north-eastern Brazilian state of Ceará. Diario do Nordeste has reported that the company has invested US$66m in a development, though whether this will take the form of a clinker grinding or integrated cement plant has not been disclosed.
Companhia Siderúrgica do Pecém (CSP) will reportedly supply granulated blast furnace slag to the facility when operational for use as a feedstock.