Resource utilization method of limonite type laterite-nickel ore leachate

Abstract

The invention discloses a limonite type laterite-nickel ore leachate resource utilization method which comprises the following steps: adding ammonia water into limonite type laterite-nickel ore leachate to adjust the pH value, and carrying out iron precipitation reaction to obtain iron precipitate and ammonium oxalate-containing filtrate; dissolving the washed iron precipitate by using a phosphoric acid solution to obtain an iron phosphate solution; adjusting the pH value of the iron phosphate solution by adopting ammonia water, and carrying out iron precipitation reaction to obtain an initial product of an iron phosphate precursor; washing and drying the initial product of the iron phosphate precursor to obtain an iron phosphate precursor; evaporating, cooling and crystallizing the filtrate containing ammonium oxalate to obtain regenerated ammonium oxalate and crystallized mother liquor; according to the invention, the iron source for preparing the iron phosphate precursor is effectively widened; meanwhile, the influence on the purity, the granularity and the morphology of the iron phosphate precursor due to the fact that impurity anions NO3 <->, SO4 < 2-> or Cl <-> are easily introduced when nitrate, chlorine salt and sulfate of Fe < 2 + > or Fe < 3 + > are used as the iron source is avoided.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of limonite-type laterite nickel ore, and in particular relates to a method for resource utilization of limonite-type laterite-nickel ore leaching solution. Iron source to prepare iron phosphate precursor and regenerate ammonium oxalate. Background technique [0002] At present, the laterite nickel ore with abundant reserves has become the resource development center of the global nickel industry, but 70% of the laterite nickel ore is low-grade limonite-type laterite nickel ore, of which the nickel content is only 0.8-1.5%, while the limonite content is almost As high as more than 90%, and most of the nickel occurs in limonite, so the separation of nickel and iron has become the primary condition for nickel extraction. Oxalic acid-ammonium oxalate solution reduces iron and enriches low-grade valuable metals in limonite-type laterite nickel ore, which is a new method for preliminary s...

AI Technical Summary

Problems solved by technology

Oxidation precipitation method and alkali precipitation method are the classic preparation methods of ferric phosphate precursors, divided by iron powder, Fe 2 o 3 As the iron source, phosphoric acid was used as the leaching agent and phosphorus source, and the iron phosphate precursor was prepared in vitro with the participation of oxidant and lye, and the other was free Fe 2+ or free Fe 3+ Nitrate, chloride and sulfate are used as the iron source, and lye is used as the pH value regulator. In the process of preparing the iron phosphate precursor, the introduction of anions in the iron source and cations in the lye will affect the purity and particle size of the iron phosphate precursor. and morphology have a certain impact; at the same time, sodium, potassium, ammonium nitrates, chlorides, and sulfates will be produced, which need to be treated separately, resulting in high production costs

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