Gypsum industry news

US: Fertiliser company Mosaic is seeking approval from the Environmental Protection Agency (EPA) to test using phosphogypsum on a pilot road project at its New Wales site in Mulberry, Florida. It hopes to test using the substance in three 60m sections of road, according to correspondence seen by the Tampa Bay Times newspaper. The proposed test road will use a mixture of sand with up to 50% phosphogypsum in a 25cm base. The road will then be monitored over the next 18 months.

The EPA originally approved the limited use of phosphogypsum in road construction in 2020. However, this was then subsequently blocked. Local legislation in Florida allowing the Florida Department of Transportation to study the use of phosphogypsum in road construction has been approved by the Florida Senate and House of Representatives but is yet to be signed off by Governor Ron DeSantis.

The Florida Industrial and Phosphate Research Institute estimates that around 1Bnt of phosphogypsum is stored in over 20 sites in the state. Over 25Mt/yr of phosphogypsum is generated, typically from fertiliser production. Environmental groups in the state have opposed Mosaic’s proposed use of phosphogypsum in road building due to its higher level of radioactivity compared to other forms of gypsum.

Ireland: France-based Saint-Gobain subsidiary Gyproc has applied to the Environmental Protection Agency (EPA) to have its sulphate discharge licence for its Drummond, County Monaghan, mine increased by 530% to 1250mg/l from 200mg/l. The Irish Independent newspaper has reported that the higher level ‘would not occur year-round,’ according to the company, but ‘only at certain times.’ The EPA is ‘awaiting additional information from the applicant in order to make a decision.’

US: The American Coal Ash Association (ACAA) has criticised a proposed revision of coal ash regulations by the Environmental Protection Agency because it will restrict the recycling of coal ash.

"EPA's proposals related to the definition of coal ash beneficial use are the opposite of a regulatory roll-back," said Thomas H Adams, ACAA Executive Director ahead of a hearing with the EPA. "Without any damage cases or scientific analysis to justify its actions, the agency is seeking to impose burdensome new restrictions that will cause millions more tons of material to be disposed rather than be used in ways that safely conserve natural resources and energy."

Adams and the ACCA argue that previous EPA rules concluded that beneficial use of coal ash should be exempt from regulation and encouraged to contribute to sustainability. However, the ACCA has taken exception with a 2015 definition of beneficial use, which was intended to prevent ‘disposal activities masquerading as beneficial use.’ By expanding the scope of this definition the ACCA says that more coal ash will be landfilled instead of being recycled.

Coal is the fuel source for approximately one-third of electricity generation in the US and produces large volumes of solid coal combustion products - primarily ash and synthetic gypsum from emissions control devices. This family of diverse products is referred to as coal combustion residuals in a disposal setting and is often generically referred to as ‘coal ash.’

According to ACAA's most recent ‘Production and Use Survey,’ 64.4% of the coal ash produced during 2017 was recycled. By volume, 71.8Mt of coal combustion products were beneficially used in 2017 out of 111Mt that were produced. Coal ash production volume increased by 4% year-on-year from 2016.