摘要
随着新能源的发展,以低铜形高冰镍为原料制备电池级硫酸镍的工艺逐步成为当前的主流工艺之一,对低铜型高冰镍常压浸出工艺的探索对后续工程应用有重要的指导意义。本文开展了低铜型冰镍两段常压浸出工艺试验,探究了一段常压浸出中酸矿比和富氧空气流速对浸出效果的影响,以及二段常压浸出中总酸矿比、浸出温度以及氧气浓度变化对总浸出效果的影响。试验结果表明,一段常压浸出中,酸矿比建议控制在250~300 kg/t,增大富氧空气流速对浸出率影响不大,在富氧空气低流速下进行浸出更加经济;二段常压浸出中,总酸矿比增加会降低终点p H值,当终点p H值低于2时,金属相镍、钴浸出率均能达到98%,当浸出温度在75℃以上时,再升温对冰镍的浸出影响较小;氧气浓度的增加对浸出有促进作用,但考虑40%富氧浓度条件下金属相镍、钴浸出率均在98%以上,所以并不建议提高氧气浓度来追求更好的浸出效果。
With the development of new energy,the process of preparing battery-grade nickel sulfate from low-copper and high-nickel matte has gradually become one of the current mainstream processes.The exploration of low-copper and high-nickel matte atmospheric pressure leaching process has important guiding significance for subsequent engineering applications.In this paper,the two-stage atmospheric pressure leaching process of low copper nickel matte was carried out.The effects of acid-to-ore ratio and oxygenenriched air flow rate on the leaching effect in the first-stage atmospheric pressure leaching were investigated.The effects of total acid-to-ore ratio,leaching temperature and oxygen concentration on the total leaching effect in the second-stage atmospheric pressure leaching were investigated.The test results show that in the first stage of atmospheric pressure leaching,the acid-to-ore ratio is recommended to be controlled at 250~300 kg/t,and increasing the oxygen-enriched air flow rate has little effect on the leaching rate.It is recommended to carry out leaching at low oxygen-enriched air flow rate,which is more economical.In the two-stage atmospheric pressure leaching,the increase of the total acid-to-ore ratio will reduce the end-point pH value.When the end-point pH value is within 2,the leaching rate of metal phase nickel and cobalt can reach 98%.When the leaching temperature is above 75℃,the temperature rise has little effect on the leaching of nickel matte.The increase of oxygen concentration promotes the leaching.However,considering that the leaching rate of metal phase nickel and cobalt is above 98%under the condition of 40%oxygen-enriched concentration,it is not recommended to increase the oxygen concentration to pursue better leaching effect.
作者
王宏岩
曹敏
WANG Hongyan;CAO Min(China ENFI Engineering Corporation,Beijing 100038,China)
出处
《绿色矿冶》
2025年第6期42-49,共8页
Sustainable Mining and Metallurgy
关键词
低铜冰镍
常压浸出
酸矿比
金属相浸出
low-copper nickel matte
leaching under atmospheric pressure
acid-to-ore ratio
metalphase leaching
