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Click to add WeChatNickel oxide is an inorganic compound composed of nickel and oxygen, with the chemical formula NiO. Nickel oxide is insoluble in water and liquid ammonia, but soluble in sulfuric acid, nitric acid, hydrochloric acid and ammonia water. It has a cubic crystal structure, similar to sodium chloride, in which each nickel atom is surrounded by six oxygen atoms in close proximity, forming a regular octahedron with the nickel atom at the center. Due to the complex nature of nickel oxide ore, flotation is the main method for ore dressing. Currently, the common nickel ore flotation includes direct flotation, sulfide flotation and combined flotation.
Direct flotation of nickel oxide is a mineral processing method that uses fatty acid collectors in a suitable pulp environment (usually requires an adjuster to adjust the pH, etc.) to make the surface of nickel oxide ore hydrophobic, and uses bubbles to bring it to the pulp surface to form a foam layer to achieve separation from gangue minerals. Collectors are mostly fatty acids, such as oleic acid, sodium oleate, etc., and adjusters are mostly alkaline, such as sodium carbonate, sodium hydroxide, etc. The process is usually: roughing, concentrating and scavenging, among which roughing is to select most of the useful minerals into the rough concentrate; concentrating is to further purify the rough concentrate and remove impurities; scavenging is to re-select the flotation tailings to recover the remaining useful minerals and improve the recovery rate.
Nickel oxide sulfide flotation method is a ore dressing method that adds sulfiding agent to sulfide the surface of nickel oxide ore to increase its floatability, and then uses the principle of foam flotation to separate nickel minerals from gangue. The flotation process is to first add a sulfiding agent, such as sodium sulfide, sodium hydrosulfide, etc., to the ore pulp to form a sulfide film on the surface of the nickel oxide ore. The surface properties of the sulfided mineral change and become easier to be collected by traditional flotation collectors. This method is similar to the direct flotation method, including roughing, cleaning and scavenging, but due to the addition of sulfidation treatment, the amount of sulfiding agent and sulfidation time need to be controlled to ensure the sulfidation effect. This method is mostly suitable for processing some complex nickel oxide ores, especially ores with very fine particle sizes where nickel is dispersed in gangue minerals in an isomorphous manner.
Nickel oxide ore often coexists with other valuable elements, such as copper and cobalt. For this type of copper oxide, a single flotation may not necessarily achieve an ideal recovery rate. Therefore, a combined flotation method is often used to achieve ore dressing. Multiple flotation methods such as direct flotation and sulfide flotation can be combined. According to the nature and characteristics of the ore, different flotation methods are selected and applied at different stages to achieve an ideal flotation effect.
The above are several flotation methods for nickel oxide. In actual ore dressing plants, the flotation of nickel oxide will be different according to the properties of nickel ore. Different flotation methods are selected. Therefore, it is recommended to conduct ore dressing tests and design suitable nickel oxide flotation processes through analysis.
Xinhai has many years of experience in nickel ore dressing. It can conduct ore dressing tests, design nickel ore dressing processes, and provide complete sets of nickel ore dressing equipment. At the same time, it can also install and debug ore dressing equipment. If there is any need for later operation and management operations, please feel free to consult, hotline: 15311826613!