The self-tensioning motor base can avoid these problems perfectly. The design ensures that the belt maintains proper tension throughout the life cycle of the belt, avoiding excessive stretching of the belt and preventing belt relaxation. There is no need to periodically relax or tighten the belt, which guarantees the extension of the belt life and improves the efficiency of the entire transmission system. The self-tensioning motor base reduces downtime, belts are easily installed and removed, and no special training is required to operate the self-tensioning motor base.

The HBI imported in the current season is all used in converter production, and the main charge for the Basic Oxygen Furnace (BOF) is molten pig iron from the blast furnace, commonly referred to as "hot metal" (HM). In addition to iron, blast furnace hot metal contains a certain amount of oxidizable elements, such as carbon, silicon, manganese, and phosphorus.

Limited by resources, technology and other factors, the production of DRI (direct reduced iron) in China started late and developed slowly. The production enterprises of DRI in China are small in scale, mainly produced by tunnel kilns, scattered in origin and unstable in production organization, which lead to the difficulties in production statistics. The products are mostly used in powder metallurgy raw materials.

Many materials may require binder in the production of cold - consolidated pellets. The choice of binder is varies from different and processes. According to our practice, we are going to make a general description of the choice of binder.

RHF direct iron smelting can be divided into INMETCO method, DRYIRON method, FASTMET method and process due to the different raw material processing conditions and product quality requirements.In the last article we have introduced the FASTMET method, this article will introduce the ITKM3 method.

The FASTMET rotary hearth furnace process, developed by MIDREX and Kobe Steel, is mainly used for blast furnace dust and rolling sludge treatment. It is reported that dezinization rates can be greater than 95% and DRI with metallization rates of 70-90% can be obtained. The world's first FASTMET process, which uses iron containing waste as raw material, was put into production in The second quarter of 2000 at Nippon Steel Hiroda Plant in Japan, with an annual processing capacity of 190,000 tons.

RHF direct iron smelting can be divided into INMETCO method, DRYIRON method, FASTMET method and ITKM3 process due to the different raw material processing conditions and product quality requirements.In the last article we have introduced the INMETCO method, this article will introduce the DRYIRON method.

In the last article, we compared the advantages and disadvantages of several coal-based reduction processes, and concluded that the rotary hearth furnace process is more suitable. This article will introduce the development of rotary hearth furnace process and the INMETCO method in rotary hearth furnace process.

At present, there are mainly the following technical routes for direct reduced iron. Coal-based direct reduced iron and gas-based direct reduced iron,Among them, gas-based reduction technologies include: COREX, Midrex, FINEX, HIsmelt, etc.Among them, coal-based reduction technologies include: tunnel kiln, RHF, rotary kiln, etc. Gas-based reduction technology can achieve large-volume industrial production. The comprehensive economic indicators are good, but the investment is relatively large. Coal-based reduction technology generally has low output and relatively low investment.

Non-blast furnace iron making technology has grown significantly in recent years, driven by increasing environmental requirements, the need for high-quality steel materials, and especially the Chinese government's commitment to "carbon neutrality" to the world. Non-blast furnace iron-making technology is dominated by the gas-based shaft furnace process, because the gas-based shaft furnace can use hydrogen reduction technology, which greatly reduces carbon emissions, In addition to the gas - based shaft furnace process, rotary kiln, tunnel kiln, RHF and other technologies are also used.