Dissolution of Nickel Matte in Hydrochloric Acid Solution

염산 용액에서 니켈 Matte의 용해반응

In order to investigate the mechanism of dissolutin of nickel from a matte composed essentially of heazlewoodite and ferronickel, the leaching in an aqueous solution of hydrochloric was carried out at $50-90^{\circ}C$, 0.5-3.ON HCl, and with the particle sizes between $100-160{\mu}m$ and $400-500{\mu}m$. The leaching rate of heazlewoodite was much rapider than that of ferronickel, and the two components were simultaneously dissolved with different reaction rates. Within the experimental range, NiS, an intermediate, was not formed. However a possibility to form a thin layer of NiS on particle surface upon saturating the reaction mixture with $H_2S$ was not excluded. At the initial stage, the activation energy was about 10 kcal/g mol. The reaction occurred at the particle surface, and consequently the particle size decreased with time. The rate of dissoultion for nickel was linearly proportional to the concentration of HCl up to 1.0N.

주성분이 heazlewoodite와 ferronickel로 구성된 니켈 matte로 부터 니켈의 용해를 지배하는 메카니즘을 규명하기 위해서, 염산용액에서 침출실험을 수행하였다. 실험온도 범위는 $50-90^{\circ}C$ 이고, 입자의 크기는 $100-160{\mu}m$와 $400-500{\mu}m$이며, 산농도는 0.5-3.ON 이었다. Heazlewoodite의 용해속도는 ferronickel 보다 휠씬 빨랐으며, 2성분이 각각 다른 반응속도로 동시에 용해하였다. 본 실험범위에서는 중간체인 NiS가 생성되지 않았지만, 반응용액이 $H_2S$로 포화되면 입자표면에 NiS의 얇은 막이 생성될 가능성을 배제할 수 없다. 반응초기의 활성화 에너지는 약 10kca1/g mol 이었고, 용해반응은 입자표면에서 진행되어 시간이 경과함에 따라 입자의 크기가 감소하였으며, 니켈의 용해속도가 1.0N 까지는 염산농도에 비례하였다.