scope of application

Environmental protection, solid waste treatment, solid and hazardous waste resource utilization

Technology provider

Xinlian Environmental Protection Technology Co., Ltd.

Brief description of technology

This technology is a "new technology for the clean utilization of steel dust and non-ferrous metal smelting slag resources". It uses electric furnace ash, zinc dross, copper-cadmium slag, electroplating sludge, pickling sludge, electroplating zinc ash and other solid and hazardous wastes containing heavy metals as raw materials to extract valuable elements, overcoming the problem of "dechlorination and impurities" of heavy metal-containing wastes with mature and stable industrial technology. This technology extracts various valuable elements such as zinc, indium, lead, cadmium, bismuth, tin, and iodine from heavy metal-containing waste, as well as industrial products such as fine iron powder and reduced iron powder, without discharge of wastewater and residue.

technical information

The total zinc smelting recovery rate is>88%, the indium smelting recovery rate is>82%, the vertical yield is>99%, the direct yield of cadmium is>98%, and the new water consumption is <5m3/tZn

Commercial applications

In 2011, Xinlian Environmental Protection invested about 500 million yuan to build a comprehensive utilization project for solid waste iron-making smoke resources in Sishuizhuang New District, Gejiu City, Yunnan Province. The equipment investment was 128.93 million yuan, and the annual treatment of 700,000 to 800,000 tons of solid (hazardous) waste containing heavy metals. The project covers an area of 240 acres and has a total construction area of 54,000 m2. It fully entered large-scale production and application at the end of 2016. So far, production has been smooth, operation is good, and product quality is stable. Every year, 42,000 tons of zinc ingots (Zn 99.995%), 15,000 tons of zinc-aluminum alloy, 45 tons of crude indium (In 99.86%), 40,000 tons of by-product lead sulfate (Pb24.84%), 426 tons of crude cadmium (81.00%), 140 tons of bismuth residue (Bi 12.92%, Cu 5.61%), 17 tons of crude iodine (I 97.79%), purified iron powder, ultra-fine purified iron powder, potassium-sodium mixed salt and other products are recycled and produced.

Help/support you hope to receive during the technology transfer process

1. Policy support and increase laws and regulations on cross-border intellectual property protection; 2. Organize business compliance training for overseas enterprises.

equipment investment

In 2011, Xinlian Environmental Protection Sishuizhuang New District, Gejiu City-Solid Waste Ironmaking Smoke Resources Comprehensive Utilization Project treated 700,000 to 800,000 tons of solid (hazardous) waste containing heavy metals annually. The project covers an area of 240 acres and a total construction area of 54,000 m2. The one-time investment cost of the project is 550 million yuan, of which the equipment investment is 128.93 million yuan.

Annual operation and maintenance fee

The annual operating cost is about 50 million yuan, the material consumption and maintenance costs are about 17.61 million yuan per year, and the operating energy consumption is about 14.32 million yuan; personnel salaries are about 5.82 million yuan; and equipment depreciation is about 12.25 million yuan.

investment recovery period

The comprehensive utilization project of solid waste iron-making smoke and dust resources in Sishuizhuang New Area of Xinlian Environmental Protection Gejiu Base annually processes 700,000 to 800,000 tons of solid (hazardous) waste containing heavy metals. The project covers an area of 240 acres and has a total construction area of 54,000 m2. The one-time investment cost of the project is 550 million yuan, including equipment investment of 128.93 million yuan; the annual operating cost is about 50 million yuan. The comprehensive economic benefit is 1.03 million yuan/year, and the direct net economic benefit is 208.09 million yuan/year. Static investment payback period = one-time investment cost ÷ direct economic net benefit After calculation, the static investment payback period is about 2.6 years.

added benefit

In the wet process of this technology, the independently developed industrial oxygen removal iron ion technology from zinc sulfate solution is used to remove iron ions in zinc sulfate solution, fully reuse the surplus oxygen on the existing production line, reduce the consumption of hydrogen peroxide by 80%, and save the cost of 1.3056 million yuan/year, and the iron removal cost per ton of zinc is reduced from 401.45 yuan/tZn to 80.29 yuan/tZn. This technology implemented industrial production at the end of 2016, and achieved a significant increase in sales revenue in 2017, an increase of 36.84% compared with 2016. The total profit was 122.7935 million yuan and the net profit was 104.4103 million yuan. The successful experience of this technology has been extended to other branches of Xinlian Company to provide technical parameters for other pyrotechnic treatment bases, and the oxygen-rich combustion technology has been extended to each branch. The project can reduce heavy metal emissions by about 2100t/a, increase the metal content of the product by about 17000t/a, reduce air pollutant emissions by 400t/a, reduce coke powder consumption by 48500t/a, reduce C emissions by 43000t/a, and reduce CO2 emissions by 158300 t/a. The amount of standard coal saved is 64500tce/a.

comprehensive benefits

This technology is highly applicable and can simultaneously treat smelting solid waste in the steel and non-ferrous industries. By extending the successful experience of this technology to other branches of Xinlian Company, it can be expected to reduce heavy metal emissions by about 2100t/a, increase product metal content by about 17000t/a, reduce air pollutant emissions by 400t/a, reduce coke powder consumption by 48500t/a, reduce carbon emissions by 43000 t/a, reduce CO2 emissions by 158300 t/a, and save standard coal by 64500tce/a. This technology can process 1.2 million tons of steel dust and non-ferrous metal smelting slag annually, treat 340,000 m3 of wastewater, and recycle and produce 42,000 tons of zinc ingots every year.(Zn 99.995%), 15,000 tons of zinc aluminum alloy, 45 tons of crude indium (In 99.86%), by-product lead sulfate 40,000 tons (Pb24.84%), 426 tons of crude cadmium (81.00%), 140 tons of bismuth slag (Bi 12.92%, Cu 5.61%), 17 tons of crude iodine (I 97.79%), 100-mesh purified iron powder with a TFe grade of more than 99%, and high-end ultra-fine purified iron powder with 200-mesh and 325-mesh, sodium and potassium mixed salt and other products, separate and extract valuable metals in smelting solid waste, turn waste into treasure, and realize harmless and resource utilization of steel dust and heavy metal smelting waste.

Level of impact of obstacles on technology transfer

Poor local infrastructure conditions and difficulties in financing

technology maturity

This technology has high maturity. This technology can be subdivided into: pyrotechnic enrichment technology system for solid and hazardous wastes containing heavy metals such as steel dust, wet separation coupled extraction technology system, professional energy-saving technology system and professional pollution control technology system. The technical system for pyrotechnic enrichment of solid and hazardous wastes containing heavy metals such as steel dust mainly includes the collaborative treatment technology of steel dust and non-ferrous smelting waste residue and the technology of controlling the reduction atmosphere in rotary kiln and preparing reduced iron powder. This technology gives full play to the advantages of high carbon content and low moisture content of steel dust by scientific ratio of raw materials for rotary kiln, and solves the problem of high energy consumption and uneconomical heat enrichment due to non-ferrous smelting waste residue due to low metal grade and high moisture content., effectively improves the economy of collaborative processing, thereby greatly improving the ability of the technology to process a variety of non-ferrous smelting waste residues. Through precise control of multiple links such as additive formula, reducing atmosphere in the kiln, segmented temperature in the kiln, and combustion-supporting technology, the content of metallic iron in the reduced kiln slag is greatly increased, and high added value reduced iron powder is obtained through the subsequent kiln slag iron separation process., enhance the comprehensive utilization value of resources. Through nearly 8 years of testing, research and development, this technology has fully entered large-scale production and application at the end of 2016. So far, production has been smooth, operation is good, and product quality is stable. This technology has been applied on a large scale in many subsidiaries such as Xinlian Environmental Protection Gejiu Base, Tangshan Xinlian, Handan Xinlian, Quzhou Yesheng, and Shifang Xinlian. Its technological maturity, economy, environmental protection and stability have been fully verified, and its technical level is in a leading position at home and abroad.

technical applicability

This technology is highly applicable and can simultaneously treat electric furnace ash, zinc dross, electroplating sludge, acid cleaning sludge, galvanized ash, etc. produced in the steel and non-ferrous smelting industries. The equipment used in each process is mature, conventional and applicable industrial equipment, and is reasonably improved and combined. Among them, the pyrotechnic process has low investment and can be scattered in steel plants; the wet process has high requirements on scale and can be centrally deployed in a certain location to process the high chlorine zinc oxide powder obtained by enrichment in multiple pyrotechnic plants across the country.

technical stability

Through nearly 8 years of testing, research and development of this technology, Xinlian Environmental Protection Gejiu Sishuizhuang New District fully entered large-scale production and application at the end of 2016. So far, production has been smooth, operation is good, and product quality is stable. This technology has been successfully promoted to many subsidiaries such as Tangshan Xinlian, Handan Xinlian, Jiangxi Jinplatinum Rhenium, Quzhou Yesheng, and Shifang Xinlian, and has been applied on a large scale.

technical safety

This technology extracts valuable elements from solid and hazardous wastes containing heavy metals such as steel dust and zinc smelting slag, and there is no upstream resource restriction. This technology extracts valuable metals and industrial products from heavy metal-containing solid waste. The residual heat is used for wet system heating and waste heat power generation. The harmless tailings are used for environmentally friendly building materials, realizing the "eating and squeezing of heavy metal-containing waste". From raw material solid hazardous waste to product metals, to wastewater treatment, all are closed circulation. Except for the inevitable emission of smoke that meets the standards in the fire removal process, there is no discharge of wastewater and solid waste, no secondary pollution is produced, and it is completely green., with large emission reduction and high degree of resource utilization.

Barriers to technology transfer and promotion

Local infrastructure conditions are poor and financing is difficult

intellectual property transfer

This technology has domestic independent intellectual property rights, and the intellectual property rights are owned by Xinlian Environmental Protection Technology Co., Ltd.(enterprise), and a total of 28 intellectual property rights (12 patents, 8 utility models, and 8 software copyrights) have been obtained.