In that previous section, we have introduced Plackett–Burman (P–B) design and have defined four key performance indicators (KPIs). This section will discuss the results of the KPIs, summarize the results of P–B design. The results show that the material property effects are not as significant as those of the operational conditions and geometric parameters. In particular, the geometric parameters were observed to significantly influence the energy consumption, while not affecting the mixing quality and mixing time, showing their potential towards designing more sustainable mixers. Furthermore, the analysis of granular temperature revealed that the centre area between the two paddles has a high diffusivity, which can be correlated to the mixing time.

Following the above, in this part the discrete element method (DEM) and Plackett–Burman (P–B) design were used to investigate the mixing performance of a double paddle mixer. To this end, several material properties (i.e., particle size ratio, density ratio and composition), operational conditions (i.e., filling pattern, fill level and impeller rotational speed) and geometric parameters (i.e., paddle size, angle and number) were examined. In order to quantitatively analyse their effects on mixing performance, a number of key performance indicators (KPIs) were defined, namely the average steady-state RSD (KPI 1), the mixing time (KPI 2) and the average mixing power (KPI 3). In addition, KPI 4 was formulated as a multiplication of KPI 2 and KPI 3 to examine the mixing time and energy consumption at the same time.

To improve the understanding of the mixing performance of double shaft, batch-type paddle mixers, the discrete element method (DEM) in combination with a Plackett–Burman design of experiments simulation plan is used to identify factor significance on the system’s mixing performance. Effects of several factors, including three material properties (particle size, particle density and composition), three operational conditions (initial filling pattern, fill level and impeller rotational speed) and three geometric parameters (paddle size, paddle angle and paddle number), were quantitatively investigated using the relative standard deviation (RSD). Four key performance indicators (KPIs), namely the mixing quality, mixing time, average mixing power and energy required to reach a steady state, were defined to evaluate the performance of the double paddle mixer.

With the demand of structural adjustment and optimization of China's iron and steel industry, and the requirements of green, low-carbon and high-quality, pellets as high-quality raw materials for blast furnace are more and more favored by the industry, which promotes the rapid development of the pellet industry.

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.