Praseodymium neodymium carbonate is a light green powder, insoluble in water, and its octahydrate compound loses six molecules of crystal water when heated to 100 ℃. Dissolve in acid to form corresponding praseodymium salt solution and release carbon dioxide. Carbon dioxide is introduced into the suspended aqueous solution of praseodymium hydroxide, converted into crystal precipitation and dehydrated.

A. Raw material preparation

The raw materials are roughly processed by crushing and ball milling, the advanced high-efficiency and energy-saving grinding equipment in the industry is adopted, the mechanical dust-free transportation and fine processing are carried out, and finally the qualified oxidized materials are prepared by oxidative roasting.

B. Optimal solution extraction

The patented technology developed by the company is applied to extract rare earth and high price elements from raw materials, low acid leaching, countercurrent efficient washing, accurate and excellent dissolution and impurity removal, and prepare high-quality extraction and separation material liquid.

C. Extraction separation

Combined with the characteristics of valuable elements in NdFeB waste industry, the company has developed and applied the self-developed full linkage fuzzy extraction technology to extract and separate praseodymium (PR), neodymium (nd), gadolinium (GD), terbium (TB), dysprosium (Dy), holmium (HO) cobalt (CO) and other intermediate products. Process characteristics have the advantages of stable product quality, high purity, low cost and easy standardized operation.

D. Precipitation burning

High quality synthetic oxalic acid is used to precipitate and transform various products extracted and separated by special equipment. The physical and chemical indexes of the products are higher than those of similar products in the industry. The self-designed rotary automatic production line is used for burning, and the market is in short supply.