Laterite nickel ore is an important nickel resource. The rational development and utilization of laterite nickel ore is of great significance to meet the industrial demand for nickel. In the beneficiation process of laterite nickel ore, magnetic separation technology has the advantages of high efficiency and environmental protection. This article will discuss in detail the magnetic properties of laterite nickel ore and its effect in the magnetic separation process.
Laterite nickel ore is mainly composed of minerals such as nickel oxide and iron oxide, which will be converted into magnetic metal nickel and iron during reduction roasting. The magnetism of laterite nickel ore mainly comes from the iron and nickel oxides in it, which will form a metal phase with strong magnetism after reduction roasting.
Magnetic separation technology is widely used in laterite nickel ore beneficiation. Nickel oxide and iron oxide are converted into metallic nickel and iron by reduction roasting, and then these metal phases are separated from non-magnetic minerals such as gangue by magnetic separation equipment, thereby improving the recovery rate of nickel and iron.
Reduction roasting process is one of the key factors of magnetic separation effect. Studies have shown that parameters such as reduction temperature, reduction time, and carbon ratio have a significant effect on the magnetic separation effect of laterite nickel ore. Under the conditions of reduction temperature of 1275℃, reduction time of 60 minutes, and carbon ratio of 3, laterite nickel ore can be separated by magnetic separation to obtain nickel-iron products with a nickel grade of 4.59% and an iron grade of 25.12%.
The selection and optimization of magnetic separation equipment have a great influence on the beneficiation effect of laterite nickel ore. Commonly used magnetic separation equipment includes permanent magnetic drum magnetic separator and electromagnetic magnetic separator. Permanent magnetic drum magnetic separator has the advantages of simple structure, convenient operation, and low maintenance cost, and is suitable for processing laterite nickel ore with finer particle size. Electromagnetic magnetic separator has the characteristics of adjustable magnetic field strength and strong adaptability, and is suitable for processing laterite nickel ore with coarser particle size.
Experimental research shows that by optimizing the reduction roasting and magnetic separation process parameters, the recovery rate of nickel and iron in laterite nickel ore can be significantly improved. For example, under the conditions of rotary kiln reduction temperature of 1150℃, magnetic field intensity of 150mT and fine grinding, the metallization rate of the reduction product reached 72.21%, the nickel content in the nickel-iron alloy increased from 1.92% of the original ore to 7.26%, and the iron content increased from 21.70% of the original ore to 85.15%, and the recovery rates of nickel and iron reached 96.06% and 89.23% respectively.
Reduction roasting magnetic separation technology not only improves the beneficiation efficiency of laterite nickel ore, but also has significant environmental advantages. Compared with traditional beneficiation methods, this technology reduces the emission of harmful substances and reduces environmental pollution. At the same time, by optimizing process parameters, the maximum utilization of resources can be achieved, which meets the requirements of sustainable development and is of great significance to promoting the green development of the mining industry.
The magnetic properties of laterite nickel ore and its effect in the magnetic separation process show that reduction roasting magnetic separation technology is an efficient and environmentally friendly ore dressing method. By optimizing the process parameters, the recovery rate of nickel and iron in laterite nickel ore can be significantly improved, the production cost can be reduced, and environmental pollution can be reduced. The application of this technology not only helps to ensure the sustainable development of my country's nickel-iron industry, but also provides strong support for the long-term and stable development of my country's metal industry.
In summary, the magnetic properties and magnetic separation effects of laterite nickel ore have important application value in the ore dressing process. By continuously optimizing the process parameters and equipment selection, the ore dressing efficiency and economic benefits can be further improved.
