Method for efficiently leaching cobalt and nickel out of tungsten extraction finishing slag
A leaching and high-efficiency technology, applied in the field of nickel and cobalt leaching with high efficiency, can solve the problems of low leaching rate, high cost and large acid consumption, and achieve the effect of reducing acid consumption
Inactive Publication Date: 2019-12-31
湖北绿钨资源循环有限公司 +1
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Problems solved by technology
[0003] In view of the above problems, the object of the present invention is to provide a method for efficiently leaching cobalt and nickel from slag after tungsten extraction, aiming to solve the problem of low cobalt and nickel leaching rate and acid consumption in the traditional cobalt and nickel hydrometallurgical recovery process. Big and costly problems
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Embodiment 1
[0027] 1. Dry the tungsten-extracted slag and crush it with a jaw crusher, then dry-mill the sample with a ball mill and sieve it to control that at least 80 wt% of the particles have a particle size of less than 100 mesh. The slag sample after tungsten extraction was obtained by multi-point random sampling method, and the content of each element in it was analyzed and tested. In terms of mass percentage, the main test results are: Co 21.34%, Ni11.29%, Fe 15.23%, S 5.24 %, Si 14.32%, Al 1.58%.
[0028] 2. Weigh 200g of tungsten-extracted slag, add 2mol / L sulfuric acid solution for atmospheric acid leaching, and add 20mL of analytically pure hydrofluoric acid reagent as an additive, control the leaching temperature to 90°C, and the liquid-solid ratio to 5:1. The time is 3h.
[0029] 3. After the leaching is completed, liquid-solid separation is achieved by filtration to obtain leaching residue and a leaching solution enriched in cobalt and nickel.
[0030] 4. Wash the leachin...
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The invention applies to the industrial waste resource comprehensive recycle technology field, and provides a method for leaching cobalt and nickel out of tungsten extraction finishing slag. The method for leaching the cobalt and the nickel out of the tungsten extraction finishing slag includes: performing acid leaching on the tungsten extraction finishing slag through a sulfuric acid solution, simultaneously adding hydrofluoric acid as an additive, realizing liquid-solid separation through filtration after completing the acid leaching, obtaining leach residues and a lixivium rich in the cobalt and the nickel, using boiling water for washing the leach residues, then returning the washing water to the lixivium, and finally realizing efficient enrichment of the cobalt and the nickel in the tungsten extraction finishing slag. By adding the hydrofluoric acid as the additive, the method for leaching the cobalt and the nickel out of the tungsten extraction finishing slag effectively damagesand solves a silicon dioxide phase which wraps a cobalt and nickel oxide phase, strengthens leaching reaction of the cobalt and the nickel, improves leaching rate and leaching efficiency of the cobaltand the nickel, and effectively reduces acid consumption, thereby reducing recycle cost of the cobalt and the nickel.
Description
technical field [0001] The invention belongs to the technical field of comprehensive recovery and utilization of industrial waste resources, in particular to a method for efficiently leaching cobalt and nickel from slag after tungsten extraction. Background technique [0002] Due to the over-exploitation in recent years, the mining life of tungsten mines in the world has been shortened sharply, so the recycling of secondary tungsten resources has gradually been valued by domestic and foreign tungsten manufacturers. As the main secondary tungsten resources, waste cemented carbide, cemented carbide grinding materials and tungsten smelting slag are still rich in tungsten after recovery of tungsten through the mainstream process of molten salt roasting-water immersion method. It collects high-grade cobalt and nickel and has great recycling value. At present, the commonly used processes for recovering cobalt and nickel from cobalt-containing and nickel-containing metallurgical s...
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Login to View More IPC IPC(8): C22B7/00C22B23/00
CPCC22B7/007C22B23/0423C22B23/043Y02P10/20
Inventor 许开华蒋振康杜柯李梦予徐阿龙黄跃义
Owner 湖北绿钨资源循环有限公司