Nickel is an important nonferrous metal with a wide range of uses. It mainly occurs in nickel sulfide and nickel oxide ores in nature. 30% of nickel resources are sulfide ores and 70% are laterite nickel ores. With the increasing demand for nickel and the gradual depletion of nickel sulfide ore, the development of laterite nickel ore shows a vigorous trend. In the process of sulfuric acid decomposition 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, HCMilling(Guilin Hongcheng) will introduce the methods of recovery and reuse of lateritic nickel ore waste slag to you below.

The method of recovery and reuse of lateritic nickel ore waste residue is to calcine lateritic nickel ore waste residue at 160~900 ℃ for 20~120 min, and after natural cooling, grind it into powder material with 0.08 mm sieve residue less than 10% through nickel slag vertical grinding mill to prepare raw material of magnesium cement, road base curing material or building wall paint putty. The specific steps for the recovery and reuse of laterite nickel ore slag are as follows:

(1) The nickel slag with moisture content of 12%~18% (fine particles below 3 mm account for more than 70%, and the viscosity is strong) is dried by a fast boiling dryer, the moisture content is reduced to less than 3%, and then it is put into storage after multistage iron removal treatment, and the ingredients are put into the nickel slag grinding mill.

(2) The dried nickel slag is fed into the nickel slag mill for extrusion and crushing after batching (adding an appropriate amount of activator), and then separated by air separation. The coarse particles are returned to the nickel slag vertical roller mill, and the remaining fine powder enters the powder concentrator with the wind to prepare the finished product, which is then put into storage. The coarse powder with a specific surface area of<200m2/kg is returned to the nickel slag vertical grinding mill and then crushed. Some ultra-fine powder with a specific surface area of>450m2/kg is collected by the dust collector and then directly transported to the finished product warehouse.

Laterite nickel ore waste slag is actually a mixture of calcium sulfate, magnesium hydroxide, calcium silicate hydrate and calcium aluminate hydrate. After drying or low temperature calcination, the mixture of anhydrous calcium sulfate, magnesium oxide, dicalcium silicate and calcium aluminate is obtained. It has the common characteristics of Portland cement, magnesite cement and gypsum. It is a new type of cementitious material and has wide use 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 process of nickel slag vertical roller mill is the most important step in the recovery, reuse and resource utilization of laterite nickel slag, accounting 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 the nickel ore vertical grinding mill to replace the traditional ball mill as the main equipment for the recovery and reuse of laterite nickel ore slag. The nickel slag ultra-fine mill process of nickel slag vertical grinding mill is adopted, and the appropriate grinding fineness is achieved by reasonably adjusting the classifier to ensure the production of ultra-fine powder with specific surface area meeting the strength and activity requirements under low power consumption, so as to avoid the problem of excessive fine powder content or high energy consumption caused by the over-grinding phenomenon of traditional ball milling.

HLM series nickel slag vertical grinding mill produced by HCMilling(Guilin Hongcheng) has been widely used in various kinds of waste slag recycling and recycling to produce green cementitious materials, providing good equipment support for the recovery and reuse of laterite nickel ore waste slag. If you have the demand for laterite nickel ore waste recycling and nickel slag grinding mill, please contact HCM for equipment details.