Rare earth mine sediment and roasting extracting process

Abstract

The invention discloses a rare earth mine sediment and roasting extracting process. The rare earth mine sediment and roasting extracting process comprises the following steps of collecting leachate; pretreating the leachate; adjusting the pH value of the leachate, specifically, the pH value of the leachate is adjusted to 5.1-5.2; filtering and purifying the leachate, specifically, the leachate obtained after pH value adjustment is subjected to vacuum filtration and cleaning, and a cleaning solution and purification residues are obtained; adjusting the temperature of the cleaning solution to 30-40 DEG C; adding flocculants into the cleaning solution, and stirring the cleaning solution evenly; adjusting the pH value of the cleaning solution for dynamic precipitation, specifically, the pH value of the cleaning solution is adjusted to 9-11, the increasing speed of the pH value is controlled to be 1-2 / h, dynamic precipitation is conducted, vacuum filtration and cleaning are conducted afterwards, and precipitation residues and supernatant are obtained; and roasting the precipitation residues, specifically, the obtained precipitation residues are put into a roasting furnace to be roasted,and the materials obtained after roasting are rare earth element oxides. According to the rare earth mine sediment and roasting extracting process, the flocculants are added in the precipitation process for cross-linking reaction, the precipitation speed is increased, and the precipitation efficiency is improved. As the organic flocculants are added, the organic flocculants burn and volatilize inthe roasting process, and extraction of the rare earth is not affected.

Description

technical field [0001] The invention belongs to rare earth extraction technology, in particular, relates to a rare earth ore precipitation roasting extraction process. Background technique [0002] As an important strategic resource, rare earths are increasingly attracting widespread attention at home and abroad. Rare earths are the lanthanide elements in the periodic table of chemical elements-lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm ), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu ), and two elements closely related to the 15 elements of the lanthanide series - scandium (Sc) and yttrium (Y), a total of 17 elements, called rare earth elements (RareEarth), referred to as rare earth (RE or R). [0003] Chemical precipitation is an important process for rare earth extraction, but in the precipitation process, problems such as incomplete p...

AI Technical Summary

Problems solved by technology

[0003] Chemical precipitation is an important process for rare earth extraction, but in the precipitation process, problems such as incomplete precipitation and long precipitation process often occur. Cross-linking reaction, as a technology for molecular aggregation, is often used in the precipitation process