Petroleum Coke–Pyrolytic Carbon Anode Blend for Low-Sulfur Density Control
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Solution Overview
Problem
The increasing demand for aluminum and stringent environmental regulations are challenging the aluminum industry to find high-quality carbon anodes with consistent density, reduced sulfur content, and minimized carbon consumption, while maintaining mechanical and chemical properties, due to fluctuations in coke quality and availability of low sulfur materials.
Innovation Solution
A blend composition comprising petroleum coke and pyrolytic carbon, with pyrolytic carbon predominantly in the granular fraction, to enhance anode density and reduce sulfur content, while maintaining desired performance parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If petroleum coke is used as the primary raw material for carbon anodes, then the anodes can be produced with sufficient quantity to meet increasing aluminum demand, but the sulfur content and reactivity of the anodes increase, leading to higher carbon consumption and environmental issues
Solution Approach 1:
The patent changes the chemical composition parameters of the anode by incorporating pyrolytic carbon (1-80 wt%) alongside petroleum coke (20-99 wt%). This parameter change reduces the sulfur content and reactivity of the final anode product while maintaining production capacity, directly addressing the harmful effects of high sulfur petroleum coke
Solution Approach 2:
The patent creates a composite carbon material system by blending pyrolytic carbon with petroleum coke in specific ratios. This composite approach combines the high quantity advantage of petroleum coke with the low sulfur and low reactivity advantages of pyrolytic carbon, resolving the contradiction between productivity and harmful emissions
2Object-generated harmful factors
If the proportion of pyrolytic carbon in the blend is increased to reduce sulfur content, then sulfur emissions decrease, but the cost of production increases due to higher pyrolytic carbon requirements
Solution Approach 1:
The patent applies partial action by incorporating pyrolytic carbon at optimized levels (1-80 wt%, with specific embodiments showing 10-50 wt%) rather than requiring 100% pyrolytic carbon. This partial substitution achieves sufficient sulfur reduction and reactivity control while limiting the increase in production cost, balancing environmental benefits with economic feasibility
3Productivity
If petroleum coke quality fluctuates, then anode production can continue with available materials, but the consistency of anode density and performance deteriorates
Solution Approach 1:
The patent implements a blending system that uses petroleum coke and pyrolytic carbon in controlled proportions. The pyrolytic carbon acts as a stabilizing component that compensates for quality fluctuations in the petroleum coke feedstock, providing feedback control at the material composition level to maintain consistent anode density and performance despite variations in raw material quality
Solution Approach 2:
By creating a composite blend of petroleum coke and pyrolytic carbon, the patent reduces dependency on the quality consistency of a single raw material. The pyrolytic carbon component provides a stabilizing effect that buffers against petroleum coke quality variations, ensuring more consistent anode properties while maintaining production continuity
Data Source
AI summary
A blend composition including a mixture of (i) petroleum coke in a content of 20 to 99 weight-%; and (ii) pyrolytic carbon in a content of 1 to 80 weight-%, in view of the total weight of the blend composition, wherein the blend composition contains at least two particle size fractions: (i) granular above 0.5 mm and (ii) fines below 0.5 mm, and wherein pyrolytic carbon is at least present in the granular size fraction, an electrode recipe, and the use of the electrode as an anode in a process of making aluminum.