Technology for recovering nickel, cobalt and iron from nickel oxide ores through high-temperature chlorinating volatilization

Abstract

The invention relates to a technology for recovering nickel, cobalt and iron from nickel oxide ores through high-temperature chlorinating volatilization. The technology comprises the following steps: A, respectively pulverizing and ball-milling the nickel oxide ores and coke powder; B, uniformly mixing the nickel oxide ores, the coke powder and a chlorinating agent to carry out high-temperature chlorinating volatilization roasting, converting chlorinated nickel, cobalt and iron into gas at a high temperature, filling smoke, and in a recovering device, washing with water, absorbing and dissolving a smoke chloride solution; C, producing an oxyhydrogen mixture product containing nickel, cobalt and iron. The nickel grade of the oxyhydrogen mixture product containing nickel, cobalt and iron, produced by the invention, is high and can be used for producing stainless steel. Compared with the traditional nickel oxide ore wet-process treatment technology, the method for recovering nickel, cobalt and iron from nickel oxide ores belongs to the technology having the advantages of high resource comprehensive utilization rate, low energy consumption, environment friendliness and easiness for implementation.

Description

technical field [0001] The invention relates to hydrometallurgy, in particular to a process for recovering nickel-cobalt-iron by high-temperature chlorination and volatilization of nickel oxide ore. Background technique [0002] Nickel oxide ore is usually a symbiotic mineral containing a variety of metal elements. Contains iron, nickel, cobalt, manganese, aluminum and magnesium. In order to recycle these valuable metal elements, methods such as pyrometallurgy and hydrometallurgy have been adopted. [0003] The traditional pyrometallurgical treatment technologies of nickel oxide ore include rotary kiln drying pre-reduction-electric furnace reduction smelting to produce ferronickel; sintering-blast furnace sulfidation smelting to produce low matte nickel; and sintering-blast furnace reduction smelting to produce nickel pig iron. Rotary kiln drying pre-reduction-electric furnace reduction smelting is a classic process for processing nickel oxide ore. This method has the char...

AI Technical Summary

Problems solved by technology

In addition, in the first step of the process, that is, during the pre-neutralization with calcium oxide or calcium hydroxide to remove iron and aluminum, precious A large loss of nickel and cobalt

[0005] A method of roasting-leaching treatment of limonite-type nickel oxide ore was previously applied for (patent application number: 201010131130.0). Compared with the existing roasting-leaching process, this method has a short flow process and less reagent consumption, and can effectively Recovering nickel and cobalt in nickel oxide ore, the leaching slag is easy to comprehensively utilize, but because the nickel oxide ore is reduced and roasted first, then cooled to 300-500 °C, and then chlorinated by the two-step process of chlorination and roasting, the equipment increase, investment increase, complex operation process, and all calcined sand needs to be leached, the amount of leaching solution is large, and the metal recovery rate is low

[0006] The high-temperature chlorination method of lateritic nickel ore (patent application number: 200910094630.9) that was first applied for, the disadvantage of this method is that the high-temperature chlorination roasting temperature used is low, and the volatilization temperature of nickel chloride is 973°C.

Therefore, nickel chloride in laterite nickel ore cannot be converted into gas and enter the flue gas recovery at high temperature.