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But will this last?

Copper smelters were rewarded in China when Ukrainian drones struck Russia's Astrakhan Gas Processing Plant last September.

Astrakhan is a major producer sulphur. This sulphuric?acid is used in mining, fertilisers and more and more in the battery supply chain.

When Russia stopped sulphur imports, acid prices nearly doubled by the end of the year.

The economics of copper melting in China are being rewritten by the surge. Smelters are turning to sulphuric acids as a source of profit, as earnings from their core businesses decline.

Analysts warn this leaves them vulnerable to a volatile, unrelated market where prices will be expected to fall even though traditional processing fees are continuing to decline.

The sulphuric Acid price jump of about 500% in two and a quarter years gave China's copper?smelters an estimated $1.5 billion last year, as traditional smelting charges collapsed.

According to the half-year results of Yunnan Copper published in August, sulphuric acids sales accounted for 790 million Yuan ($114) or about a quarter gross profit.

"Acid should be a secondary product, not a main source of profit. This creates risk," Peter Harrison, an CRU analyst said.

NEW ?MONEY, OLD MONEY

Treatment and refining fees (TC/RCs) are the most common way smelters make money. The influx of new smelters, especially in China's top producer, has increased the bidding on concentrate that was previously scarce due to mine closures and disruptions.

Benchmark TC/RCs dropped below zero in December of 2024, and reached a new low of minus $49. The sulphuric-acid prices have, on the other hand, moved in the opposite direction. According to National Bureau of Statistics, they reached about 1,045 Yuan ($145), per?metric tons in early January. This compares to 464 Yuan a year ago. Analysts say that the tight global sulphur supplies due to disruptions such as the Ukrainian strikes, and uneven smelter production, have constrained availability of feedstocks used to produce sulphuric acids.

Zambia banned exports of acid in September to protect its mining industry.

As around 40% of China’s sulphur is imported, the higher prices on the global market quickly filtered through to the domestic acid markets. The demand is expanding beyond fertiliser. According to CRU, consumption linked to Indonesia’s nickel mining sector grew to less than a tenth the total sulphur requirement.

Harrison explained that while these segments are still small in comparison to fertilisers and other industrial applications, they have helped tighten a market which for many years had limited demand. Craig Lang of CRU says that sulphuric acids now account for 64% or more of smelters revenue from 'byproducts' and non-TC/RC, compared to 27% in the past.

Yunnan Copper, which announced record profits from the sulphuric acid it produces, warned investors of volatility. Daye Nonferrous, a competitor of Yunnan Copper, also warned that prices were uncertain around the time. Anna Xu is an analyst at Wood Mackenzie. She said that smelters were hesitant to accept negative TC/RCs because they feared the market would quickly turn around. In theory, she said, smelters could accept negative TCs on long-term agreements if sulphuric acids prices were above 1,000 yuan a tonne.

The smelters insist on zero because the price of sulphuric and precious metals is uncertain. Chilean miner Antofagasta In December, some Chinese smelters agreed to TC/RCs worth $0 during negotiations.

Harrison predicts a decline of 10-30% in prices over the next few months.

Beijing's November decision to limit exports and to keep more acid in the country for the fertiliser sector, as well as new projects beginning are cited.

Lang explained that any material decline in price, combined with negative TC/RCs, creates a logical argument for capacity reductions.

If acid prices fall significantly, smelters may reduce production by reducing maintenance or lowering utilisation.

(source: Reuters)