Adjusting Raw Material Strategies for Calcined Petroleum Coke Producers Amid Tightening Low-Sulfur Supply
Against the backdrop of increasingly scarce low-sulfur petroleum coke (sulfur content <1%, especially ultra-low sulfur coke <0.5%) and mounting demand competition from lithium battery anode materials and high-end prebaked anodes, calcination plants must shift their raw material strategies from a single-minded pursuit of low sulfur to a systematic approach of multi-source complementarity, cascading utilization, technological substitution, and risk hedging. The core thinking can be summarized in the following directions:
I. Raw Material Structure Adjustment: From “All Low-Sulfur” to “Scientific Blending of Low-Sulfur + Medium-Sulfur”
The biggest pain point of low-sulfur coke is that it is both expensive and scarce. In the past, calcination plants tended to maximize the use of low-sulfur coke to ensure product sulfur compliance. However, in an environment of tight supply and sky-high prices (in 2025, the average price of #1 low-sulfur coke saw a year-on-year increase of over 57% at one point), this path is no longer viable.
The practical strategy is to establish a “high-low sulfur blending” system. Prebaked anodes and ordinary power graphite electrodes have a certain tolerance for sulfur content. Medium-low sulfur coke can be blended with low-sulfur coke in specific ratios (e.g., low-sulfur:medium-sulfur = 4:6 or 3:7) to significantly reduce raw material costs while meeting downstream product sulfur requirements. The key is to build a database for every batch of raw material covering sulfur content, volatile matter, true density, and trace elements (V, Ni, Fe, etc.), and use formulation models to precisely calculate blending ratios to ensure stable physicochemical properties of the calcined coke.
For calcination plants, this means the procurement side must simultaneously secure medium-sulfur coke sources (medium-sulfur coke from domestic independent refineries accounts for about 38% of total supply and is relatively abundant), rather than concentrating all procurement pressure on low-sulfur coke.
II. Diversification of Import Channels: Lock in Stable Sources and Disperse Geopolitical Risk
Domestic low-sulfur coke accounts for only about 14% of total petroleum coke output (of which sulfur content <0.5% accounts for only about 4%), while lithium battery anodes already consume about 29% of low-sulfur coke demand and are still growing rapidly. The domestic supply gap cannot be closed in the short term. Therefore, importing low-sulfur coke remains an important supplement, but plants cannot rely on a single source.
Specific actions include:
- Multi-country sourcing: Beyond traditional Middle Eastern and Southeast Asian sources, focus on non-traditional low-sulfur coke origins such as Russia and Azerbaijan. Sign medium- to long-term offtake agreements (1–3 years) with a “benchmark price + floating adjustment” mechanism to lock in a cost floor.
- Expand high-sulfur coke imports as substitutes: High-sulfur coke has limited use in domestic prebaked anodes due to SO₂ emission concerns, but still has markets in carbon products less sensitive to sulfur, silicon carbide, calcium carbide, etc. Southeast Asian and Middle Eastern high-sulfur coke offers clear price advantages. Calcination plants can establish dedicated high-sulfur coke calcination lines targeting these downstream products.
- Use futures and options instruments: Hedge 30%–50% of import procurement volumes, and use foreign exchange hedging to mitigate the dual risk of exchange rate fluctuations combined with price volatility.
III. Technological Substitution and Formula Optimization: Reduce Dependence on Low-Sulfur Coke at the Source
This is the direction with the greatest long-term value. The essence of low-sulfur coke scarcity is a shift in downstream demand structure — lithium battery anodes and high-end graphite electrodes are growing far faster than supply. If calcination plants only solve the problem on the procurement side, they will always be reactive. They must also make breakthroughs on the technology side.
Several paths that have been validated or are actively being pursued:
- Blending auxiliary materials to reduce low-sulfur coke usage: Adding recycled graphite, carbon fiber, and other auxiliary materials to the formulations of anode materials and high-end carbon products can reduce low-sulfur coke consumption by 10%–15%. Simultaneously, improved baking and graphitization processes can further reduce per-unit petroleum coke consumption by 8%–10%.
- Partial substitution with coal-based needle coke: Coal-based needle coke costs about 20% less than petroleum coke, and its usage share in anode materials has risen from 15% to 28%. For some high-end products, industrial-scale co-use of coal-based needle coke and low-sulfur coke is already feasible. Calcination plants can proactively build needle coke calcination capacity.
- Natural graphite as an alternative: Natural graphite with surface coating (e.g., nano-silicon carbide coating) has achieved cycle life exceeding 2,000 cycles at a cost 30% lower than artificial graphite, and its market share has grown from 15% to 25%. This poses direct competition to anode material enterprises that rely on low-sulfur coke, forcing calcination plants to seriously consider raw material substitution.
- Monitor emerging raw materials such as bio-coke: Although still in pilot-scale validation, bio-coke has shown substitution potential in some carbon products and is worth ongoing technical tracking by calcination plants.
IV. Production Efficiency Improvements: Use Process Gains to Offset Raw Material Price Increases
Raw material price increases are external factors, but the yield rate, energy consumption, and scrap rate of calcined coke are within the plant’s own control.
- Improve calcined coke yield rate: Optimize calcination process parameters (calcination temperature, residence time, air distribution) to increase the yield rate by 1–2 percentage points. When raw material unit prices rise by several hundred yuan per ton, this 1%–2% yield improvement is equivalent to a direct reduction in per-unit raw material cost.
- Waste heat recovery and energy management: Introduce waste heat recovery systems to reduce per-unit energy consumption, and leverage off-peak electricity and green electricity to lower production power costs.
- Digital inventory management: Build a raw material price monitoring system to track spot and futures prices in real time and dynamically adjust procurement timing. Compress safety stock from the traditional 3 months to 1.5–2 months, reducing capital tie-up and downside price risk.
V. Supply Chain Collaboration: Bind with Upstream and Downstream to Share Risk
In an environment of low-sulfur coke scarcity, the solo procurement model is outdated.
- Sign linked pricing agreements with downstream clients: Negotiate “coke price – product price” linkage mechanisms with prebaked anode enterprises and anode material producers. When petroleum coke prices rise, product prices are adjusted proportionally, smoothly passing cost pressure downstream.
- Sign long-term contracts with refineries to lock in volume: Secure over 50% of annual low-sulfur coke procurement through long-term contracts with price cap clauses, avoiding being driven by short-term spot market volatility.
- Participate in industry coordination: Push industry associations to engage in import tariff policy optimization to reduce high-sulfur coke import costs, indirectly expanding the usable raw material pool.
Bottom Line
Low-sulfur coke scarcity is not a short-term fluctuation but a medium-to-long-term structural contradiction (domestic low-sulfur coke accounts for only 14% of total output, while lithium battery anode demand is growing at over 10% per year). Calcination plants must shift their raw material strategy from “scrambling for low-sulfur coke” to a five-pronged approach of “controlling blends, diversifying imports, pushing substitutions, improving efficiency, and binding supply chains.” Whoever completes this combination first will hold the initiative in the next raw material cycle.
Post time: May-13-2026