Recycling Research And Industrial Application Of Nickel Ions In The Supernatant Of Nickel Carbonate

Jinchuan company uses nickel sulfide nickel smelting nickel electrolysis workshop soluble anode electrolysis process, the production process for the electrolysis anode liquid purification and removing impurity, ensure new electrolytic liquid containing impurity concentration in accordance with nickel electrolysis technology requirements. The purification in addition to the impurities such as iron, cobalt using chemical precipitation method, purification process using nickel carbonate as a neutralizer adjusting the solution pH value in order to meet the technological requirements. Nickel carbonate production process of nickel carbonate with fluid to the situation of wastewater discharge. Supernatant fluid efflux index requirements of nickel acuities were0.15g/L. In practical production, nickel carbonate solution containing nickel general control at about0.05g/L, so far, nickel smelting production output in the process of supernatant fluid amount is about2200m3/d, the supernatant fluid discharge every year take nickel content of about40t, thereby causing loss to the nickel metal, nickel carbonate at the same time the supernatant after entering downstream wastewater treatment system, increasing the difficulty of wastewater treatment and cost. The nickel ions in solution on how to recycle nickel carbonate, will be processed by using waste to become an urgent need to solve the problem.Due to domestic electric nickel production enterprise production process is not the same, and processing of the enterprise on the nickel carbonate solution degree, the influence of such factors as there is no can draw lessons from the success of the treatment on the recovery of nickel carbonate solution method of the metal nickel. This article through to the traditional heavy metal ion wastewater treatment method of comparison, in combination with the practical situation of unit production ultimately selected\"precision filtration, ion exchange, liquid waste recycling chlorine tail gas absorption\" recycling treatment technology for recycling on nickel carbonate solution. On nickel carbonate solution by ion exchange precision filter effectively suspended granular nickel carbonate, recovery of nickel carbonate purification recycling in addition to iron; Precision filter processing liquid after a new CN-27chelating resin adsorption, recycling that the supernatant fluid free nickel ion, recovery of nickel solution to return to the production system; After adsorption recycling nickel waste liquid containing Na+, recycled to absorb the production process of chlorine emission, reduce the residual chlorine absorption liquid alkali and water consumption.Through the production test and industrial application, the processing method can satisfy the jinchuan company nickel electrolysis workshop on nickel carbonate solution treatment purpose and requirements of the economic and social benefit is remarkable, if factory promotion, every year can recycle nickel content36t (recovery rate90%), save residual chlorine absorption liquid alkali consumption of14455t, dosage of new water saving65700m3, economic benefits of more than120120yuan, fully meet the jinchuan company comprehensive utilization of resources\"eat dry bleed\", is\"using waste treat waste, waste, recycling economy\" model of process, accord with the requirement of circular economy and sustainable development, has a wide prospect of industrial application.