Problems in the recovery of gaseous hydrogen sulfide resources in modern coal chemical industry and breakthroughs in the GLT-chelated iron zero-waste solution technology

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This post was last edited by Steven_p0kTk on 2026-3-11 08:52. In today’s era of rapid development in the modern coal chemical industry, the recovery of gaseous hydrogen sulfide resources remains a persistent challenge for this sector. Traditional desulfurization processes face various challenges, including low sulfur recovery rates, difficulties in handling waste liquids and residues, high operating costs, and significant pressure to meet environmental regulations. These issues not only hinder the economic efficiency of enterprises but also fall far short of the strategic requirements related to \"ultra-low emissions, circular economy, and dual carbon goals.\" Against this backdrop, the GLT integrated iron-zero waste liquid technology has emerged, bringing a revolutionary breakthrough that offers a new path for green transformation in the industry; it has become the key solution for coal chemical enterprises to reduce pollution and carbon emissions while improving quality and efficiency. I. The industry’s challenges become apparent: Traditional processes struggle to cope with the dual pressures of environmental protection and efficiency. In the modern coal chemical industry, hydrogen sulfide recovery is a crucial factor in ensuring production safety, product quality, and environmental protection. However, for a long time, traditional desulfurization processes (such as the tannin/PDS/ADA method, etc.) have had numerous insurmountable drawbacks, putting enterprises in a dilemma of \"high costs, low returns, and high risks\": (1) Technical bottlenecks hinder development: Traditional processes suffer from issues such as low sulfur recovery rates, poor purification accuracy, uncontrolled side reactions, low regeneration efficiency, and poor compatibility with gas sources. The accumulation of by-products can lead to equipment corrosion and system blockages, requiring shutdowns to clean the towers 1–2 times per year, which severely affects continuous production ； Such acid gas from coal chemical processes, characterized by high CO2 partial pressures and high impurity contents, is difficult to handle; moreover, in the range of medium to low sulfur content of 100 kgS/day to 30 tS/day, there are no efficient recovery technologies available, creating a technical gap in this industry. (2) The environmental crisis is approaching a critical threshold: Traditional processes generate 5–10 tons of desulfurization waste per ton of sulfur produced, with disposal costs reaching 3,000–4,000 yuan per ton; moreover, this can lead to secondary pollution ； The hydrogen sulfide concentration at the outlet can only be maintained between 30 and 100 mg/Nm³, which fails to meet the ultra-low emission requirement of ≤5 mg/Nm³; as a result, the risk of environmental penalties increases significantly ； The sulfur paste produced has a high content of impurities, making it difficult to utilize it as a resource; moreover, dumping it creates additional pressure in terms of solid waste, thus putting coordinated management of the three types of waste in a difficult situation. (3) Economic imbalances do not constitute a win-win situation: Traditional manufacturing processes require the installation of multiple facilities such as a desulfurization system and waste liquid treatment units, resulting in substantial investment costs ； Operating costs such as chemical consumption, hazardous waste disposal, and equipment maintenance remain high; merely the annual maintenance costs account for over 15% of the total operating costs ； The sulfur yield is only 50% to 60%, with a large amount of sulfur resources being lost in the form of by-products or sulfur pastes, resulting in a significant reduction in resource benefits and a severe imbalance between investment and returns. II. Technical breakthroughs: The GLT combined iron zero-waste liquid technology addresses the key challenges in this industry. Based on the principles of \"targeted catalytic oxidation, zero waste emission, and efficient recovery,\" this comprehensive technology overcomes the limitations of traditional processes, achieving significant improvements in terms of performance, environmental sustainability, cost-efficiency, and adaptability. It thus represents a revolutionary solution for the recovery of hydrogen sulfide in coal chemical industries. (1) Key performance advantage: Resource recovery efficiency reaches new heights. The GLT process utilizes complexed iron catalysts to achieve targeted oxidation of hydrogen sulfide, thereby reducing side reactions at the source. Its sulfur recovery rate is over 99%, far exceeding the 50%~60% level of traditional processes, with almost zero loss of sulfur resources ； The hydrogen sulfide concentration at the outlet is kept steadily below 5 mg/Nm³, allowing the ultra-low emission requirements to be met without the need for additional advanced treatment ； The by-product salt formation rate is ≤0.5%, effectively eliminating the problems of system blockage and equipment corrosion caused by the accumulation of by-product salts in traditional processes, thereby ensuring the continuous and stable operation of the installation. (2) Outstanding environmental benefits: Eliminating the problems associated with waste substances at the source, GLT’s chelated iron method serves as a benchmark for \"zero-waste\" technologies. It resolves the environmental issues associated with traditional processes: no waste liquids are generated during the desulfurization process, thus eliminating the environmental risks and high costs associated with the disposal of hazardous waste liquids ； No wastewater, no hazardous waste, and no secondary pollution; there is no need to install complex systems for treating these three types of waste, enabling \"single-stage treatment to meet all standards\"” ； The sulfur products produced have high purity and can be sold directly as industrial raw materials, enabling the high-value utilization of sulfur resources. This approach eliminates the problem associated with traditional processes, where sulfur paste is difficult to recycle and has to be disposed of at low prices, thus truly turning waste into treasure. (3) Economic value advantage: The significant reduction in life-cycle costs gives GLT combined iron technology a notable economic advantage for enterprises; the investment cost is only 40%–50% of that of traditional processes, and there is no need to install additional facilities for waste liquid treatment or by-product salt extraction, thereby greatly reducing initial investments ； The operating cost is only 30%~50% of that of traditional processes; there are no costs associated with hazardous waste disposal. Steam consumption is reduced by 60%~88%, and chemical consumption is significantly decreased ； Furthermore, the annual additional revenue from sulfur sales can range from 3.65 million to 9 million yuan, resulting in a significant increase in resource earnings ； At the same time, there is less by-product salt and less corrosion; the equipment maintenance cycle is extended by 3 to 5 times, and annual maintenance costs are reduced by over 70%, highlighting the clear advantages in terms of life-cycle cost. (4) Superior adaptability: Filling industry technology gaps, the GLT combined iron technology overcomes the limitations of traditional processes; it has wide compatibility with various gas sources and can handle complex acidic waste gases from coal chemical industries that contain high levels of CO₂, tar, and dust, thus solving the problem of traditional processes being unsuitable for such special gas sources ； The sulfur removal capacity covers the entire range from 100 kgS/day to 30 tons of S/day, perfectly filling the technical gap between the upper limit of treatment using traditional processes and the lower limit applicable to the Claus process ； The modification is highly convenient; it can be carried out through adaptive adjustments to existing desulfurization systems, without the need for reconstruction or prolonged shutdowns. The modification process is fast and requires low costs, thereby minimizing the barriers to technological upgrading for enterprises. (5) Guarantee for mature applications: Stable operation with no concerns – The GLT combined iron technology has achieved stable industrial application, featuring a high level of maturity and reliable performance. To address the company’s concerns regarding technical compatibility and professional operation and maintenance, the technical team can provide customized modification solutions ； At the same time, comprehensive technical support and staff training are provided to help enterprises quickly master key technologies such as catalyst regeneration, sulfur particle separation, and sulfur recovery, address the challenge of securing a sufficient supply of skilled professionals, and ensure that these technologies yield results as soon as they are put into use. III. Value Outlook: Contributing to the dual-carbon strategy for a sustainable green future. Under the strategic guidance of \"reducing pollution and carbon emissions while achieving synergistic benefits,\" the green transformation of the coal chemical industry has become an inevitable trend. The GLT integrated iron-zero wastewater treatment technology not only addresses the core challenge of hydrogen sulfide recovery for enterprises, but also, with its significant advantages of efficient resource recycling, environmental protection at the source, and cost-effective production operations, helps companies achieve a balance among economic benefits, environmental benefits, and social benefits. This technology is suitable for the purification and recovery of all hydrogen sulfide-containing gases, including scenarios with high-concentration carbon dioxide acidic exhaust gases and high-concentration hydrogen sulfide acidic exhaust gases. It can be widely applied in modern coal chemical industries such as coal coking, coal gasification, and coal liquefaction. The GLT complexed iron zero-waste liquid treatment technology can not only eliminate the generation of waste liquids and residues from coking desulfurization at the source, but also efficiently recover sulfur resources. It facilitates the transition of the coal chemical industry toward a circular economy model, providing strong impetus for enterprises to reduce costs, enhance efficiency, and improve their core competitiveness. Furthermore, it plays a significant role in implementing the “dual carbon” strategy and improving ecological and environmental quality.