Control technology for extracting and purifying nickel from acid nickel-containing solution

Abstract

The invention relates to a control technology for extracting and purifying nickel from an acid nickel-containing solution. The control technology comprises the technological processes of PH adjustment and oxidation, solid impurity and organic matter removal, foreign ion removal, nickel ion adsorption, cleaning before saturation column regeneration, regeneration and reclaiming agent preparation control, exchange column cleaning, resin conversion, column cleaning after conversion, standby preparation and concentrating. The technical limitations that nickel in an aqueous solution recycled through a traditional ion exchange technology is low in purity, low in concentration and high in acidity are broken through, purifying, extracting and concentrating of the nickel are conducted through combination of a plurality of varieties of ion exchange resin and special processing techniques, a nickel sulfate recovery solution with high purity, high concentration and low acidity is obtained, and the nickel sulfate recovery solution can be directly used for producing high-purity nickel salt, metallic nickel, plated nickel and other nickel products.

Description

technical field [0001] The invention relates to an extraction and purification control process of nickel in an acidic nickel-containing solution, in particular to an extraction and purification control process for obtaining nickel from an acidic solution by using ion exchange technology, and belongs to the technical field of hydrometallurgy. Background technique [0002] According to the national clean production regulations, metallurgical processing enterprises have strict requirements on the utilization rate of metal resources and water saving rate. Among them, the effective recovery of heavy metals in nickel-containing wastewater and the recycling of wastewater are already the basic principles of heavy metal-containing wastewater treatment. Requirements, the technical methods currently used to process and extract nickel in nickel-containing solutions at home and abroad include chemical methods, extraction methods, membrane methods and ion exchange methods. [0003] (1) Ch...

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Problems solved by technology

[0005] (2) Extraction method: the nickel ions in the solution can also be purified and extracted by extraction, impurity removal and extraction concentration, but the disadvantage of the extraction process is that the system is polluted by the extraction agent and solvent, which is not conducive to obtaining high-quality nickel products and environmental protection

[0006] (3) Membrane method: some enterprises use membrane method (nanofiltration membrane or reverse osmosis membrane) to recover heavy metals, but because membrane recovery is full liquid recovery, impurity components in the recovered liquid, especially impurity metal ions, cannot be removed, due to harmful impurities Accumulate and cannot be recycled for a long time. In addition, due to the low metal concentration of the recovered liquid, it needs to be evaporated and concentrated before it can be used, and the energy consumption is high.

However, due to the limitation of the current ion exchange technology level, the purification, purification and concentration of nickel in the recovery process and the automatic control of the process cannot be realized.

Therefore, the recovery solution of nickel in nickel-containing wastewater is not only low in concentration and purity, but also has a high content of free acid, which cannot be directly used

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