Method for manufacturing green environmental-protection battery-grade ferrous oxalate

Abstract

The invention discloses a method for manufacturing green environmental-protection battery-grade ferrous oxalate; the method comprises the steps: with a full circulation process for production of a mother liquid with ferrous oxalate, carrying out a continuous reaction of a pure iron bar with the mass percentage of 99.95% and a reaction mother liquid containing sulfuric acid with the mass percentageof 12%-16% for 8-12 h under normal temperature and pressure, to generate a ferrous sulfate solution; pumping the ferrous sulfate solution to a reaction kettle by a pump, heating up to 38-42 DEG C, then adding an oxalic acid aqueous solution, to generate a precipitate ferrous oxalate and dilute sulfuric acid, carrying out cooling and separation steps, carrying out washing and drying processes of the solid ferrous oxalate, allowing all the liquid sulfur acid to return to a ferrous sulfate preparation process, and carrying out cyclic repetition of the all steps, so as to save consumption of theraw material sulfuric acid and consumption of alkaline materials required for subsequent neutralization of the acidic mother liquid. The method has the advantages of reducing raw material consumptionand reducing the cost of wastewater treatment, at the same time, the particle size distribution of the ferrous oxalate product is uniform, and the method shows good economic and environmental benefitsin technology.

Description

Technical field [0001] The invention belongs to the technical field of chemical raw material manufacturing, and specifically relates to a green manufacturing technology of battery-grade ferrous oxalate. Background technique [0002] At present, there are many methods for manufacturing battery-grade ferrous oxalate in the existing technology. The domestic industry can be summarized into three types of raw material routes: the first is the hematite acid solution-light reduction method: the advantage is that the raw materials are easily available. The cost is low; the disadvantage is that the process route is long, the impurity removal is not easy, the product quality is not high, and the environmental pollution is large. The second is the ferrous sulfate-oxalic acid replacement method: the advantage is that the process is simple and the investment is low; the disadvantage is that the product separation is difficult, the quality is not high, the waste water is difficult to treat, an...

AI Technical Summary

Problems solved by technology

[0002] At present, there are many manufacturing methods of battery-grade ferrous oxalate in the prior art, and the same industry in China can be classified into three types according to the raw material route: the first one is hematite acid-solution-light reduction method: the advantage is that the raw material is easy to get, Low cost; the disadvantage is that the process route is long, it is not easy to remove impurities and refine, the product quality is not high, and the environmental pollution is relatively large

The second is ferrous sulfate-oxalic acid replacement method: the advantage is that the process is simple and the investment is low; the disadvantage is that the product separation is difficult, the quality is not high, the waste water is not easy to treat, and the pressure on environmental protection is great

The third is the iron-oxalic acid synthesis method: the advantages are good product quality, low cost, and no environmental pollution. In comparison, the third method has more sales market and competitive advantages, and more importantly, there is no environmental pollution. Green environmental protection process; but the disadvantage of the third method is that the process is relatively complicated, the requirements for raw material quality and proportion control are strict, and the investment is relatively high