Nickel is an important non-ferrous metal with a wide range of uses. It mainly occurs in nature as nickel sulfide ore and nickel oxide ore. 30% of nickel resources are sulfide ore and 70% are laterite nickel ore. With the increasing demand for nickel and the gradual depletion of nickel sulfide ore, the development of laterite nickel ore is developing vigorously. During the sulfuric acid decomposition process of laterite nickel ore, the waste residue of laterite nickel ore has become a factor restricting the wet nickel extraction process. As a manufacturer of nickel slag vertical grinding mill, Guilin Hongcheng will introduce to you today the recycling method of laterite nickel ore waste slag.
Nickel Slag Vertical Grinding Mill, welcome to leave a message or consult [email protected]
The recovery and reuse method of the laterite nickel ore waste slag is to calcinate the laterite nickel ore waste slag at 160-900° C. for 20-120 minutes. After natural cooling, it is ground into a powder of 0.08mm by a nickel slag vertical mill to make raw materials for magnesium cement, solidified materials for road bases or putty for building walls. The specific steps of the recovery and reuse method of laterite nickel ore waste slag are as follows:
(1) After drying the nickel slag with a moisture content of 12% to 18% (fine particles below 3 mm account for more than 70% and have strong viscosity), the moisture content is reduced to 3% or less, it will be put into storage after multi-stage iron removal treatment, and the ingredients will be put into the mill.
(2) The dried nickel slag is fed into the vertical nickel slag mill for extrusion and crushing after batching (adding an appropriate amount of activator). Separation by winnowing, the coarse particles return to the nickel slag vertical mill, and the remaining fine powder enters the powder separator along with the wind to make finished products. Coarse powder with a specific surface area of<200m2/kg is returned to the nickel slag vertical mill for crushing, and ultrafine powder with a specific surface area of >450m2/kg is collected by a dust collector and directly transported to the finished product warehouse.
The lateritic nickel ore waste residue is actually a mixture of calcium sulfate, magnesium hydroxide, calcium silicate hydrate and calcium aluminate hydrate. After drying or low-temperature calcination, anhydrous calcium sulfate, magnesium oxide, dicalcium silicate and The mixture of calcium aluminate has the common characteristics of Portland cement, magnesite cement and gypsum. It is a new type of cementitious material and has a wide range of uses in the construction industry.
The recovery and reuse process of laterite nickel ore waste slag is simple, does not involve high temperature, high pressure and expensive materials, and is easy to implement. The grinding process is the most important step in the recycling and utilization of laterite nickel ore waste slag, which accounts for about half of the total power consumption. In order to reduce production costs, energy consumption and improve the efficiency of nickel slag grinding, we recommend that you choose nickel ore The vertical mill replaces the traditional ball mill as the main equipment for the recovery and reuse of laterite nickel ore waste slag.
The ultra-fine grinding process of nickel slag vertical mill is adopted, and the appropriate grinding fineness is achieved through reasonable adjustment of the classifier, so as to ensure the production of ultra-fine powder with a specific surface area that meets the requirements of strength and activity under low power consumption, and avoid the excessive grinding of traditional ball mills. The grinding phenomenon causes problems of excessive fines content or high energy consumption. The HLM series nickel slag vertical mill produced by Guilin Hongcheng has been widely used in the recycling and reuse of various waste slags to produce green cementitious materials, and provides good equipment assistance for the recycling of laterite nickel ore waste slag. If you have a demand for the recycling of laterite nickel ore waste slag, please leave us a message to learn more about the equipment.
