1.Technology Introduction
The whole process of GreenNovo’s core technology includes five parts: pyrometallurgical process, comprehensive hydrometallurgical recovery process, zinc casting and zinc alloy deep processing process, kiln slag comprehensive utilization process, and water treatment process. It can handle various metallurgical solid hazardous wastes in industries such as steel, non-ferrous metals, electroplating, and chemical industry, including steel fume, heavy metal-containing non-ferrous metal slag, electroplating sludge, etc., and can be used for the resource-based treatment and utilization of high-chlorine solid waste containing heavy metals.
The technology has developed a high-temperature enhanced reduction volatilization recovery process based on oxygen-enriched combustion. By regulating the oxygen-enriched atmosphere and excess air, it improves combustion efficiency and temperature stability in a high-temperature environment, enhances reduction efficiency, and achieves energy saving. It has developed a comprehensive non-ferrous metal recovery technology of “multi-stage countercurrent alkali washing to remove chlorine + stepwise impurity removal + multi-stage selective recovery”. The chlorine removal rate is >99%, and multiple impurities are removed to achieve efficient stepwise recovery of more than 10 metals/non-metals such as zinc, indium, germanium, cesium, gallium, lead, cadmium, tin, bismuth, and iodine. For the secondary wastewater pollution control in the recovery process, a separation and purification technology of triple-effect evaporation + continuous freezing crystallization is developed. Coupled with oxidation to analyze iodine and air blowing to extract iodine technology, industrial recovery of cesium sulfate and iodine with a purity of ≥95% from steel fume is achieved for the first time internationally, filling the gap in the recovery of iodine from steel fume internationally.
Compared with similar technologies, this technology has characteristics such as diversified raw materials, diversified products, full-process green environmental protection, and efficient and circular operation of the system. It has advantages such as high recovery efficiency of zinc-containing fume, large treatment scale, high extraction efficiency of valuable elements, and zero discharge of waste residue and wastewater. It is currently a relatively ideal method for resource-based recovery of steel fume.

2.Technology Advantages
Relying on its independently developed core patented technology with complete intellectual property rights – “pyrometallurgical enrichment – hydrometallurgical impurity removal – multi-stage coupling integrated processing technology for graded extraction”, combined with independently designed comprehensive utilization equipment for industrial waste resources, GreenNovo takes heavy metal-containing solid hazardous waste such as steel fume and non-ferrous metal smelting slag as raw materials and extracts various valuable elements such as zinc, indium, gallium, germanium, rubidium, cesium, lead, cadmium, bismuth, tin, etc., as well as industrial products such as iron concentrate powder, reduced iron powder, and anhydrous sodium sulfate.

GreenNovo has long been dedicated to serving the country’s “Beautiful China Construction” and “green development” strategies. The company has been recognized as a “national-level specialized, refined, distinctive, and new ‘little giant’ enterprise”, “national-level green factory”, “national key high-tech enterprise under the Torch Program”, “Yunnan Province technology little giant enterprise”, “national-level Gejiu industrial solid waste comprehensive utilization base – Honghe Prefecture heavy metal solid waste centralized resource utilization demonstration center”, “national demonstration project of advanced and applicable technologies for comprehensive utilization of resources (2013)”, “Basel Convention Regional Centre for Asia and the Pacific of the United Nations Environment Programme – GreenNovo environmental protection technology demonstration base”, and other honors. The core technology has won numerous national and provincial-level honors. It has been selected into the “Directory of Advanced and Applicable Process Technologies and Equipment for Comprehensive Utilization of Industrial Resources (2021 Edition)”, “Directory of Green Technology Promotion (2020)”, “Directory of Major Environmental Protection Technical Equipment Encouraged by the State (2020 Edition)”, “Advanced and applicable technologies for the construction pilot of national ‘zero-waste cities’ (first batch)” and “Directory of advanced and applicable technologies for comprehensive utilization of industrial solid waste (first batch)”. It has also won awards such as the “First APEC ‘Innovation Light’ Outstanding Achievement Award for Technological Innovation of Small and Medium-sized Enterprises”, “First Prize of Environmental Technology Progress Award in 2019 (one of the eight first-prize projects nationwide)”, “Second Prize of China Nonferrous Metals Industry Science and Technology Award”, “Science and Technology Progress Award of Private Technology Development Contribution Award”, and others. In addition to technological innovation, GreenNovo also actively explores business model innovation in the field of resource utilization of solid hazardous waste containing heavy metals. It has formed close cooperative relationships with dozens of large and medium-sized steel and non-ferrous metal smelting enterprises in China and expanded new business models such as contract environmental services (CES) and EPCO. At the same time, in 2016, GreenNovo announced the implementation of the “globalization strategy” and began to enter overseas markets, exporting technology and management operation services to “Belt and Road” countries such as Southeast Asia. Adhering to the corporate mission of “Innovation, building a green future”, it promotes the great historical transformation of the global disposal method of solid waste containing heavy metals to comprehensive resource utilization and creates a new chapter in the development of the environmental protection industry.