MATERIAL AND ITS METHOD FOR RAPID ELUTING IN AN IONIC RARE EARTH ORE LEACHING SITE

Abstract

The invention relates to a material and its method for rapidly eluting ammonium ions and soluble metal cations in an ionic rare earth ore leaching site, which comprises the following steps: 1) Ferrous sulfate is dissolved in water as an eluant; 2) Take the soil sample from the closed leaching site of ionic rare earth ore to make an eluting column, use the above-mentioned eluent to elute, more than 95% water-soluble and exchangeable ammonium ions in the soil sample are eluted, while more than 90% of the residual rare earths in the soil sample are exchanged into the eluent, which can quickly achieve the purpose of eluting ammonium ions in the leaching site and recovering the residual rare earths, and is beneficial to the soil remediation for the leaching site.

Claims

1. The invention relates to a method for rapid eluting in an ionic rare earth ore leaching site, which belongs to the field of environmental protection technology, and the method comprises the following steps: 1) Weigh a certain amount of ferrous sulfate (FeSO4.7H2O) and dissolve it in water to prepare a 0.5-5 g/L solution, and use a small amount of sulfuric acid or alkali to adjust to pH4-6 of the solution as the eluant; the optimal value of eluant is 3 g/L, pH 5.5; 2) Take the soil sample from the closed leaching site of ore ionic rare earth ore in southern Jiangxi to make an eluting column, and use the above-mentioned eluent to elute according to the ratio of eluant (ml)/soil sample (g)=1-5, the optimal eluting ratio is 4; take the sample at the determined intervals to analyze the content of ammonia nitrogen and rare earths, after the eluting is completed, take the sample to analyze the content of ammonia nitrogen and rareearths in the soil sample in the eluting column. The pH of the final eluent is greater than 5.5, which can be further processed. cm 2. The processing steps of the method for rapid eluting in an ionic rare earth ore leaching site as described in claim 1, Step 1) the raw material of ferrous sulfate (FeSO4.7H2O) can use industrial waste ferrous sulfate in the titanium dioxide industry; cm 3. The steps of the method for rapid eluting in an ionic rare earth ore leaching site as described in claim 1, Step 1) dissolve ferrous sulfate with water to make a solution of 0.5-5 g/L, and adjust to pH 4-6 with acid or alkali to prepare the eluant; the optimal value of eluant is 3 g/L, pH=5.5.

4. The steps of a material and its method for rapid eluting in an ionic rare earth ore leaching site as described in claim 1, Step 2) take the soil sample from the closed leaching site of ionic rare earth ore in southern Jiangxi to make an eluting column, and use the above-mentioned eluent to elute according to the ratio of eluent (m1)/soil sample (g)=1-5, the optimal eluting ratio is 4.

5. The invention can realize the elution of more than 95% water-soluble and exchangeable ammonium ions in the soil sample in an ionic rare earth ore leaching site, while the replacement rate of residual rare earths in the soil sample is also more than 90%.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG. 1 is a schematic diagram of the technical route for the method of rapid eluting in an ionic rare earth ore leaching site.

DETAILED DESCRIPTION OF THE INVENTION

[0011] The following is a further detailed description in combination with the preferred embodiments shown in the drawings; specific embodiments are as follows:

Embodiment 1

[0012] Weigh 6 g of ferrous sulfate (FeSO4.7H2O) and dissolve it in 2 L of deionized water to obtain the eluant of pH=5.5; take a soil sample of a closed ore rare earth ore leaching site in southern Jiangxi (sampling depth is 3-5 meters). After testing, the total content of ammonia nitrogen (NH3-N) in this soil sample is 286 mg/kg, the water-soluble and exchangeable ammonia nitrogen is 268 mg/kg, the fixed ammonia nitrogen is 18 mg/kg, and the content of rare earth (IRE) is 85 mg/kg; take 300 g of soil sample to make an exchange column, elute the exchange column with the above eluant, collect the eluent and analyze the content of ammonium ions and rare earths in the eluent. When the eluent is collected to 1,200 ml, the ammonia nitrogen and rare earths in the eluent are less than 1 mg/L, indicating that the eluting has been completed; after removing the soil sample from the eluting column and drying it, the content of ammonia nitrogen and rare earth (IRE) were analyzed to be 23 mg/kg and 4.3 mg/kg, respectively. The elution rate of water-soluble and exchangeable ammonia nitrogen was 98.1%, and the elution rate of residual rare earths was 94.9%.

Embodiment 2

[0013] Weigh 4 g of industrial grade ferrous sulfate (FeSO4.7H2O) and dissolve it in 2 L of running water to obtain the eluant of pH=5.5; take 300 g of soil sample in Embodiment 1 to make an exchange column, elute the exchange column with the new eluent, collect the eluent and analyze the content of ammonium ions and rare earths in the eluent. When the eluent is collected to 1,200 ml, the ammonia nitrogen and rare earths in the eluent are less than 1 mg/L, indicating that the eluting has been completed; after removing the soil sample from the eluting column and drying it, the content of ammonia nitrogen and rare earth (IRE) were analyzed to be 28 mg/kg and 5.5 mg/kg, respectively. The elution rate of water-soluble and exchangeable ammonia nitrogen was 96.3%, and the elution rate of residual rare earths was 93.5%.