Method for preparing cobalt oxalate by ammonia-free oxalic acid precipitation

Abstract

A method for preparing cobalt oxalate by ammonia-free oxalic acid precipitation includes steps: subjecting cobalt-containing waste residues to leaching and decontaminating processes to obtain cobalt chloride solution performing precipitation with oxalic acid as a precipitant, and performing aging, leaching and washing under a stirring state to obtain mother liquor and cobalt oxalate crystal in granularity of 30micron and complete in crystal form. The method has advantages that adding of ammonium-containing compounds such as ammonium salt, ammonium hydroxide or the like is avoided, and ammonium-containing wastewater in a production process is avoided, so that ammonium removal treatment of wastewater in subsequent procedures is avoided, production cost is saved, environmental hazards are reduced, and valuable metal cobalt can be recycled to the utmost extent.

Description

technical field [0001] The invention relates to the technical field of cobalt oxalate preparation, in particular to a method for preparing cobalt oxalate by precipitation of ammonia-free oxalic acid. Background technique [0002] Cobalt is an important metal material with excellent physical, chemical and mechanical properties. It has a wide range of applications. It is the raw material for preparing magnetic recording media, optoelectronic devices and integrated circuits. The isotope Co-60 is also an important radioactive source. my country's cobalt consumption has averaged an annual growth rate of 19.9% ​​since 1998, and it is currently the world's largest cobalt consumer. Cobalt oxalate is an important intermediate product for the preparation of high-quality cobalt oxide and elemental cobalt powder, and its production and preparation methods are mainly solid-phase synthesis and liquid-phase precipitation. Due to the simple process and equipment of the liquid phase precip...

AI Technical Summary

Problems solved by technology

Due to the complex components of this kind of ammonia-containing wastewater, the recovery and treatment process is cumbersome, and the investment and operation costs are high. Most domestic cobalt oxalate manufacturers first mix the ammonia-containing wastewater with other wastewater from the factory to dilute the ammonia nitrogen concentration, and then add quicklime for simple neutralization. Such direct discharge will not only cause serious harm to the environment, but also a huge waste of resources and energy.

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