Biological method for recycling rare earth from low-concentration heavy yttrium rare earth wastewater

Abstract

The invention provides a biological method for recycling rare earth from low-concentration heavy yttrium rare earth wastewater, and belongs to the biotechnology field. The method includes the steps that a liquid beef extract-peptone medium is used for cultivating Serratia marcescens, and thalli are harvested; then a rare earth solution with the initial concentration being 10-200mg / L is added with the Serratia marcescens, constant temperature vibration is conducted under the conditions that the pH is 4-5.5, the temperature is 20-40 DEG C and the rotating speed is 50-400r / min, then an adsorption solution is subjected to centrifuging under the condition of 8000*g at the temperature of 4 DEG C, and rare earth ion adsorption thalli are harvested; an EDTA complexometric titration method is used for measuring the concentration of supernate rare earth ions, and the rare earth ion adsorbing capacity is calculated; and finally, the thalli with the given rare earth ion adsorbing capacity are added into a desorption reagent, constant temperature vibration is conducted for desorption, and a desorption solution is subjected to centrifuging under the condition of 8000*g at the temperature of 4 DEG C so that thalli can be harvested; and the EDTA complexometric titration method is used for measuring the concentration of the supernate rare earth ions, and the rare earth ion desorption rate is calculated. By the adoption of the method, damage to the environment by the rare earth ions can be removed, rare earth resources are recycled from the low-concentration wastewater, the process is simple and practicable, operation cost is low and the method is environmentally friendly.

Description

technical field

[0001] The invention relates to the field of biotechnology, in particular to a biological method for recovering rare earths from low-concentration heavy yttrium rare earth wastewater. Background technique

[0002] Ionic rare earth ores are unique rare earth minerals in my country. They have a complete composition of rare earths, are rich in medium and heavy rare earth elements, and are dominated by heavy rare earths. In the mining process of ionic rare earths, in order to improve the recovery rate of resources, enterprises usually use ammonium sulfate as a high-concentration leaching agent. The leaching of rare earths leads to 1-200 mg / L rare earth ions in groundwater and downstream streams.

[0003] The rare earth elements contained in the wastewater discharged by the ionic rare earth production enterprises migrated to the downstream area with the groundwater, resulting in a much higher content of rare earth elements in the mining area and downstream soil t...

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