Rare earth metals are essential for wind turbines and electric vehicles but leave a toxic footprint and potential short supply may become a limiting factor.
Liu Hongqiao, August 30, 2016
Rare earth metals, hard-to-find materials, with unfamiliar names such as lanthanum, neodymium and europium, are used in wind and solar energy projects, but dwindling supplies could hinder a roll-out of low carbon technologies and slow China’s shift away from coal power.
These compounds, which are highly toxic when mined and processed, also take a heavy environmental toll on soil and water, posing a conundrum for policymakers in China, the world’s biggest producer and consumer of rare earths.
In 2012 the Chinese government named the city of Ganzhou, in the southeastern province of Jiangxi, a “rare earths kingdom”; even though at that time its rare earth reserves were already almost depleted.
According to a rare earths white paper issued by the State Council News Office in 2012, the reserves to extraction ratio for rare earth elements in southern China was 15. In other words, if mining continued at the existing rate, those reserves rich in medium and heavy rare earth elements (MHREEs) would only last for another 15 years.
Three years later and 6,000 miles away in Paris, 190 countries signed the historic Paris Climate Agreement, including plans to introduce a greater share of wind and solar power for a “decarbonised” future. But few of the delegates gathered in Paris seemed to realise how important one small south-central Chinese city would be to achieving this target; as almost all the clean, smart and low-carbon technologies are reliant on rare earths.
This prompts the questions: do we have enough rare earths to build the clean and smart future we’re imagining; can China, supplier of 90% of the global rare earths over the last 20 years, meet expected growth in demand; and what will the environmental consequences be.
Rare earths kingdom
Chinese geologists working in Ganzhou fifty years ago discovered ion-absorbing rare earths; a discovery that restructured the world’s supply of rare earths. China replaced the US as the biggest producer of rare earths and Ganzhou rapidly became the world’s largest producer of MHREEs.
Despite rapidly depleting reserves Ganzhou still accounts for more than half of all MHREEs produced in China.
MHREE: Medium heavy rare earth metald. LREE: Light rare earth metals.
A visit to the mines and industrial parks of Ganzhou gives no sense of a glorious “kingdom”. It’s a scene of devastation: crude open air mines and smelters, and rough muddy attempts at restoring the landscape. It’s a sight hard to associate with the environmental technologies that rare earths are used in.
Water in and around the mining area is severely polluted. According to China Environmental News, the water supply for 30,000 people in the county of Longnan alone has been affected by rare earth mining, with 40,000 mu (6,589 acres) of farmland seeing reduced yields or complete harvest failure.
Over a decade of excessive extraction has left the surface water in the Zudong mining area, China’s biggest source of ion-absorption rare earths, with ammonia and total nitrogen levels far above safe standards; while groundwater is nowhere near up to minimum drinking water standards.
In April 2012 a cross-ministry investigation headed up by the Ministry of Industry and Information Technology found 302 abandoned rare earth mining sites in Ganzhou, with almost 100 square kilometres affected. It would take 70 years just to deal with the 190 million tonnes of mining waste left behind.
China’s government says the country “meets 90% of the world’s demand for rare earths, but has only 23% of global reserves.” In the early 1990s China overtook the US to become the world’s biggest producer and exporter of rare earths and since then has virtually become a monopoly supplier, with some rare earth products produced only in China. If you trace them back to the source the vast majority of fluorescent lamps, off-shore wind turbines, electric and hybrid cars, smartphones and personal electronic devices have, thanks to the rare earths used in their components, “Chinese DNA”.
According to the US Geological Survey, at one point China accounted for 98% of global rare earth output. In 2015 that figure still reached 85%.
China’s role as rare earths provider maybe even greater given the growing black market. The main importers who benefit from China’s rare earths production, such as the US, Korea and Japan, as well as the manufacturers and brands who use rare earths in their products, often tap into a substantial black market in rare earths. Every year tens of thousands of tonnes of rare earth ores are illegally mined and traded, leaving China through the black market.
Those higher up the supply chain turn a blind eye to this, and international cooperation on law enforcement is minimal. With no international traceability system, such as that for conflict minerals, companies have no way of monitoring supply chains and we cannot know if the electric cars we drive or the smartphones we use contain illegally mined and smuggled rare earths.
The huge profits to be made means Ganzhou is plagued by illegal mining. The China Rare Earth Industry Association estimates that in 2013 the actual supply of rare earths in southern China was over 50,000 tonnes, and over 40,000 tonnes in 2014. However the Ministry of Land and Resources only permitted output of 17,900 tonnes per year for that period. That means the black market may be two to three times the size of the legitimate market.
And rare earth mining, whether legal or not, entails shocking environmental costs. Research has found that producing one tonne of rare earth ore (in terms of rare earth oxides) produces 200 cubic metres of acidic waste water. The production of the rare earths needed to meet China’s demand for wind turbines up to 2050 (in a scenario of radical wind power expansion) will result in the release of 80 million cubic metres of waste water – enough to fill Hangzhou’s West Lake eight times over. Not to mention the emissions from the rest of the product lifecycle; smelting, separation, processing, transportation.
Business, policy-makers and consumers all need to think again: what actions can we take to ensure we meet our low-carbon goals in a way which is friendlier to both the environment and the climate? It is after all both contradictory and unjust to sacrifice public health and the environment in a resource-producing area for the sake of low-carbon development.
reproduced from The Third Pole with permission.