The Daxigou siderite mine in Zhashui County, Shaanxi Province, is my country’s largest siderite ore base, with reserves exceeding 300 million tons. It belongs to the sedimentary metamorphic siderite type. The ore composition is simple, with siderite as the main iron mineral , followed by limonite and a small amount of other minerals.

Ferrous metal ore beneficiation 115

Magnetite, an iron mineral, also contains a type of mineral due to isomorphism. A fixed quantity Mg²⁺ and Mn²⁺ , roots​ according to The high percentage of MgCO₃ molecules allows it to be classified as magnesian siderite. The gangue minerals are primarily quartz and sericite. Mica, followed by chlorite, dolomite, muscovite, and barite, etc. The multi-component composition of the siderite ore from Daxigou, Shaanxi. The elemental analysis, iron phase analysis, and main mineral composition are shown in Tables 4-20 to 4-22.

Table 4-20 Multi-element chemical analysis of siderite ore from Daxigou, Shaanxi Province         unit:%

Table 4-21 Iron phase analysis of raw siderite ore from Daxigou, Shaanxi Province           unit:%

Table 4-22 Main mineral composition and content of siderite ore from Daxigou, Shaanxi Province       unit:%

In 2004, the siderite mine at Daxigou in Shaanxi Province adopted a rotary kiln roasting- magnetic separation-reverse flotation process, achieving a roasted ore grade of [missing information]. The advanced grade of the final concentrate was 61.48%, the total tailings grade was 8.25%, and the metal recovery rate was 83.83%. Indicators. Currently, Shaanxi Daxigou has built two rotary kiln roasting (coal-fueled) roasting-magnetic separation-flotation production lines (1.8 million tons/year), laying a solid technical foundation for the industrial application of low-grade complex siderite . Currently, this… The mine has begun construction of a roasting and magnetic separation production line with an annual capacity of 8 million tons of siderite . It received an award for scientific and technological progress in metallurgical mining in 2009. First prize. The current mineral processing flow of the plant is shown in Figure 4-8 .

Changsha Research Institute of Mining and Metallurgy conducted a systematic study on the magnetized roasting of siderite, focusing on fine-grained materials . The “multi-stage circulating cyclone magnetization roasting-magnetic separation-(flotation)” scheme was adopted, using a novel multi-stage circulating cyclone magnetization roasting device. The core technologies are artificial intelligence control of equipment and process parameters, and coupled technology and equipment for solid fuel gasification and magnetization roasting. The procedure has been completed at a rate of 650 kg /h . The pilot test can be completed in 30 seconds. The magnetization reaction is completed internally, resulting in significant energy savings compared to traditional methods. Compared to traditional roasting technologies, this method saves over 30% on energy. For materials of all particle sizes, it employs a “new type of rotary kiln magnetized roasting-magnetic separation-” approach. The “flotation technology” scheme utilizes two-stage magnetization, complementary utilization of fuel and reducing agent , and artificial intelligence control of process parameters. This is the core technology. A continuous test of 35 kg /h has been completed , and a test of 2 million tons/ year is underway. The construction of the ore dressing plant , and Compared with traditional roasting technology, rotary kiln increases unit capacity by 30% , reduces energy consumption by more than 25%, and ensures smooth production.