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

A low-concentration, rare-earth technology, used in water pollutants, chemical instruments and methods, biological water/sewage treatment, etc., to achieve the effect of eliminating environmental hazards, being environmentally friendly, and the process being simple and easy to implement

Inactive Publication Date: 2017-11-03
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the current lack of economical and effective methods for recovering rare earth resources from low-concentration rare-earth wastewater, and provides a biological method for recovering rare-earth from low-concentration heavy yttrium rare-earth wastewater

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Add about 0.25 g of Serratia marcescens (wet weight) to a 500 mL Erlenmeyer flask containing 250 mL of an initial concentration of 0.104 g / L rare earth solution, and adjust the pH of the adsorption solution to 4.0, 4.5, 5.0, 5.5 , 6.0, adsorbed in a constant temperature water-bath shaker at 30°C with a rotation speed of 200r / min for 1h.

[0032] (2) The adsorption solution was centrifuged at 4°C and 8 000×g for 20 min, and the cells adsorbing the rare earth ions were harvested.

[0033] (3) measure above-mentioned step centrifugation gained supernatant volume, measure supernatant rare earth ion concentration with EDTA complexometric titration, calculate rare earth ion desorption amount, the adsorption amount of Serratia marcescens under different pH conditions is as follows figure 1 shown.

[0034] From figure 1 It can be seen that within the pH range studied, the adsorption capacity of Serratia marcescens to heavy yttrium rare earth ions increases rapidly with th...

Embodiment 2

[0036] (1) In a 500mL Erlenmeyer flask containing 250mL initial concentration of 0.103g / L heavy yttrium rare earth solution, add about 0.25g Serratia marcescens (wet weight) respectively, adjust the pH of the adsorption solution to 5.5, and place Adsorption in a constant temperature water bath shaker with a rotational speed of 200r / min for 5, 15, 20, 40, 60, 120 minutes.

[0037] (2) The adsorption solution was centrifuged at 4°C and 8 000×g for 20 min, and the cells adsorbing the rare earth ions were harvested.

[0038] (3) measure above-mentioned step centrifugal gained supernatant volume, measure supernatant rare earth ion concentration with EDTA complexometric titration, calculate rare earth ion desorption amount, the adsorption amount of Serratia marcescens under different adsorption time is as follows figure 2 shown.

[0039] From figure 2 It can be seen that the adsorption capacity of Serratia marcescens to heavy yttrium rare earth ions increases with the increase o...

Embodiment 3

[0041] (1) In the 500mL Erlenmeyer flask containing 250mL different initial concentrations of heavy yttrium rare earth ion solutions, add about 0.25g of Serratia marcescens (wet weight) respectively, adjust the pH of the adsorption solution to be 5.5, at 30°C, the rotating speed is Adsorption in a constant temperature water bath shaker at 200r / min for 1h.

[0042](2) The adsorption solution was centrifuged at 4°C and 8 000×g for 20 min, and the cells adsorbing the rare earth ions were harvested.

[0043] (3) measure above-mentioned step centrifugation gained supernatant volume, measure supernatant rare earth ion concentration with EDTA complexometric titration, calculate rare earth ion desorption amount, Serratia marcescens to heavy yttrium under different initial rare earth ion concentration conditions The adsorption capacity of rare earth ions is as image 3 shown.

[0044] From image 3 It can be seen that the adsorption amount of rare earth ions by Serratia marcescens i...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/18C22B59/00C02F3/34C02F101/20
CPCC02F3/34C02F2101/20C22B3/18C22B7/006C22B59/00Y02P10/20
Inventor 梁长利段敏静许宝泉陈陵康罗仙平郑祖凤
Owner JIANGXI UNIV OF SCI & TECH
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