How does this Japanese coastal steel mill manage the environment?

High double

Kimitsu iron works NSSC is one of the core production plant. The factory was built in 1965 and is located in No. 1 Junjin, Junjin City, Chiba Prefecture. It covers an area of ​​about 10.2 million cubic meters and is a consistent iron system built on the beach built by reclamation. In FY2016, Junjin Steel's crude steel output was 8.86 million tons, and its main products were thin plates, plate, wire, profiles and steel pipes.

The Junjin Steel Works actively takes measures to carry out various environmental protection activities, participates in the construction of an environmentally friendly society, and actively strives to become a "green and sunny ironmaking institute." The environmental management work of Junjin Iron and Steel Institute mainly includes water recycling, atmospheric environmental management, solid waste utilization, etc. The highest responsible person is the director of the Iron and Steel Institute. Other environmental management personnel include the Minister of Safety, the Minister of Production, the Minister of Equipment, and the Minister of Management.

In terms of industrial water management, Junjin Steel has actively improved water quality, improved the treatment efficiency of wastewater treatment equipment, and insisted on detailed testing and control of wastewater quality every day to prevent steel mills from polluting adjacent public waters. In order to obtain a better water environment, the Iron and Steel Institute actively takes measures to meet the relevant water regulations and recycles 90% of its fresh water. Junjin Steel has developed a facility that uses microorganisms for wastewater treatment, achieving almost 100% recycling of industrial water in addition to evaporation, and effectively utilizing water resources.

In order to prevent abnormal drainage caused by operational errors, etc., Junjin Steel has formulated an emergency plan for abnormal drainage to prevent the factory from draining outside the plant area and polluting public areas.

In terms of atmospheric environmental management, Junjin Steel has a variety of equipment for industrial waste gas treatment. Taking into account the weather factors such as strong winds, the coal and iron ore dumping area where Junjin Steel is located is equipped with sprinklers and wind-proof nets, and is equipped with sprinklers and road sweepers on the roads in the area, and uses the exhaust gas treatment equipment to remove smoke and dust. Harmful substances such as dioxins. Specifically, the Junjin Iron and Steel Institute mainly carries out atmospheric environmental management work from the following four aspects:

The first is to recycle coke oven and blast furnace gas to generate electricity. Junjin Steel has a combined cycle power plant with two 350MW units and one 300MW unit. The fuel used is the gas produced during the production of Junjin Steel. In addition to meeting its own power supply, the gas is also supplied to the Tokyo Electric Power Company, which not only effectively utilizes the gas produced by the steel plant, but also reduces CO2 emissions.

The gas mixer, flue gas filter and flue gas compressor are installed on the upper side of the combustor burner of Junjin Iron and Steel Power Plant. These equipments are used to mix coke oven gas into fuel gas in low-calorie blast furnace gas to stabilize the combustion temperature. At 1300 °C, by-product gas is used as fuel in the operation of the power plant.

The second is the use of solid waste recycling. In this regard, Junjin Steel has adopted the following two process technologies.

The first is the technology of dust recycling resources utilization. The Junjin Steel Works can reuse the dust from the blast furnace and converter in the iron plant, and realize the effective use of these dusts in the construction materials, agricultural fertilizers, etc., and also the iron-containing and carbon-containing components in the steel dust. Effective use has achieved energy savings.

The second is a rotary hearth furnace (the RHF) recovering zinc-containing dust. Nippon Steel & Sumitomo Metal is the design builder of the world's largest rotary hearth furnace. The rotary hearth furnace is simply a coal-based mixed reducing agent. Through continuous high-temperature reduction, the iron dust-based by-products containing a large amount of iron oxide produced in the steelmaking and metallurgical processes are separated from the harmful metals such as zinc. The recycled green chemical equipment solves the problem that it is difficult to effectively recycle the produced zinc-containing metal and iron dust in the conventional iron making process, and establishes a resource recycling type iron making process. (see picture 1)

The process principle of recovering zinc-containing dust is as follows: firstly, the dust and the residue are granulated by a disk-shaped granulator, and then the granules are dried and sent to a rotary hearth furnace, and after carbon reduction for 10 to 20 minutes, iron particles and zinc are formed. Vapor. The iron particles after reduction have high strength and can be used as raw materials for blast furnaces. At the same time, the exhaust gas discharged from the rotary hearth furnace is collected by a dust remover, and the gaseous zinc is recycled in the form of secondary dust. Thereby, almost all iron, carbon and zinc contained in the iron filing by-product can be effectively utilized. The rotary hearth furnace, the entire group may be NSSC more efficient reuse of dusts, i.e. 2.24 million tons of iron ore per year savings, and recovering nearly 80 million tons of carbon dioxide gas. Junjin Steel has the world's largest iron dust recovery rotary hearth with an annual capacity of 310,000 tons.

The third is the recycling of waste shells. Junjin Steel has effectively used waste shells instead of steel production materials – limestone . Due to the long-standing problem of food processing in Fujin City, the lack of place for waste shells and the difficulty in handling shell odors, Junjin Steel has developed recycling technology for waste shells to solve local problems. (See Figure 2)

The fourth is the recycling of waste plastics. The Jinjin Iron and Steel Co., Ltd. uses the chemical circulation method of the coke oven to re-resource 100% of the packaged waste plastics recovered from ordinary households. Since 2000, Junjin Steel has been recycling waste plastics, and the annual waste plastics processing capacity has remained at 75,000 tons. The recycling of waste plastics by Junjin Steel is a coke oven chemical material treatment process. In this process, waste plastics are recycled in two stages:

The first stage, the pre-processing stage of waste plastics. Waste plastics from municipalities are processed to achieve the quality and shape required to be placed in a coke oven. First, iron, aluminum metal, glass shards, gravel, and other materials are removed; the plastic is then ground into a powder, the PVC plastic is removed, and reshaped.

The second stage, the stage of plastic thermal decomposition treatment. The plastic fed to the coke oven is heated to 1200 ° C in an oxygen-free sealed carbonization chamber to cause thermal decomposition. Generally, plastics begin to thermally decompose at 200 to 450 ° C, and produce high-temperature gas, which is almost completely carbonized at 500 ° C. The high temperature gas produced by thermal decomposition can produce hydrocarbon oil and coke oven gas, and coke is recovered as a residue.

After the plastic is used in the coke oven, the coke oven produces hydrocarbon oil (light oil and tar) which can be used as a chemical raw material, coke for iron-making reductant, and coke oven gas for fuel gas or power generation. 40% of the waste plastics produced by coke oven treatment are light oil and tar, 20% are coke, and 40% are coke oven gas. (See Figure 3)

Junjin Steel has long been committed to the recycling of used automobiles, and the use of scrap iron generated from the decomposition of used automobiles as a raw material for recycling steel. Since Japan has more cars scrapped every year, scrap cars have become one of the main sources of scrap steel. However, the method of shredding scrap car blocks can not effectively remove the copper , nickel , tin and other metals contained in the transformer, which will result in scrap steel. Poor quality.

In order to solve this problem, Junjin Iron and Steel Co., Ltd. and the Japan Scrap Association jointly developed a dismantling system and equipment for removing scrap metal from heavy metals in the transformer. The main point is to remove the thin plate and motor to reduce copper before feeding to the shredder. The content of inclusions. After chopping, the content of copper, nickel and tin can be controlled at the level required by the user.

In addition, Junjin Steel has long been engaged in the development of resource recycling technology in cooperation with Fujin East Japan Recycling Co., Ltd., and is also working on the recycling of used cans as steelmaking materials.

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