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Phosphate oxygen isotope pretreatment sample preparation method for characteristic water sample of phosphogypsum leachate

An oxygen isotope and leachate technology, which is applied in the preparation, sampling, and measuring devices of test samples, can solve the problems of low phosphate recovery rate, high cost, time-consuming and labor-intensive, etc., to improve purity, save time and Cost, the effect of eliminating the suction filtration step

Pending Publication Date: 2022-01-07
CHENGDU UNIVERSITY OF TECHNOLOGY +1
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Problems solved by technology

[0007] Purpose of the invention: Based on the above needs, the present invention provides a phosphate oxygen isotope pretreatment sample preparation method for characteristic water samples of phosphogypsum leachate, so as to solve the problems that the current phosphate oxygen isotope pretreatment methods are not suitable for acidic water bodies and phosphate recovery. Low efficiency, time-consuming and labor-intensive and high cost problems

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  • Phosphate oxygen isotope pretreatment sample preparation method for characteristic water sample of phosphogypsum leachate
  • Phosphate oxygen isotope pretreatment sample preparation method for characteristic water sample of phosphogypsum leachate
  • Phosphate oxygen isotope pretreatment sample preparation method for characteristic water sample of phosphogypsum leachate

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Embodiment 1

[0052] The method of the present invention analyzes the phosphate oxygen isotope of simulated phosphorus-containing wastewater and simulated phosphorus-containing wastewater with the characteristics of phosphogypsum leachate:

[0053] According to the water quality analysis results of phosphogypsum leachate, a group of phosphorus-containing wastewater with different concentration gradients were prepared, respectively 5mg / L, 20mg / L, 50mg / L, 100mg / L and 300mg / L, using potassium dihydrogen phosphate and ultrapure water Configure, and configure a group of phosphorus-containing wastewater with the same phosphorus concentration gradient in addition, so that the fluoride ion concentration of the latter is 100mg / L, the sulfate radical concentration is 2500mg / L, and the organic matter concentration is 40mg / L. Use sodium fluoride, Potassium sulfate and humic acid configuration. The configuration volumes are 1200, 500, 280, 200 and 80 ml respectively, and the phosphate oxygen isotope pre...

Embodiment 2

[0060] The inventive method is to the analysis of actual phosphogypsum leachate and phosphogypsum stockpile groundwater:

[0061] Two parallel samples were taken from the leachate collection tank and groundwater of a phosphogypsum storage yard, the former were marked as 1#-1 and 1#-2, and the latter were marked as 2#-1 and 2#-2. Immediately after sampling, use 0.45 μm membrane filter to remove particulate matter, carry out δ by the method of the present invention 18 o P Analytical pretreatment experiments.

[0062] Table 2 The recovery rate of phosphate in each step of the actual site water sample pretreatment

[0063]

[0064] Table 2 shows that the recovery rate of phosphate in each step of the present invention applied to actual phosphogypsum leachate and groundwater of phosphogypsum stockpile is good, and the recovery rate of phosphate to finally generate silver phosphate reaches more than 90%.

[0065] Figure 6 is the phosphate oxygen isotope test results of the a...

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Abstract

The invention discloses a phosphate oxygen isotope pretreatment sample preparation method for a characteristic water sample of phosphogypsum leachate. The method comprises the following steps: adding zirconium gel beads into a water sample to adsorb phosphate in the water sample; putting into a sodium hydroxide solution for desorbing phosphate; adding an ammonium molybdate solution to generate ammonium phosphomolybdate precipitate; adding a citric acid-ammonia water solution to dissolve the ammonium phosphomolybdate precipitate into a phosphate solution; adding a magnesium oxide solution to generate magnesium ammonium phosphate precipitate; adding nitric acid to dissolve the magnesium ammonium phosphate precipitate into a phosphate solution; adding a silver nitrate solution, and adjusting the pH value to 5 to generate silver phosphate precipitate; and performing vacuum drying treatment on the silver phosphate precipitate to obtain a to-be-detected sample. Aiming at the problems of low phosphate recovery rate and high cation removal cost in the conventional pretreatment method of the phosphate delta <18>OP in the water body, the invention avoids the use of a large amount of anion adsorption resin and cation adsorption resin, and ensures the purity of Ag3PO4 and the delta <18>OP test reliability.

Description

technical field [0001] The invention relates to a sample preparation method for phosphate oxygen isotope pretreatment of characteristic water samples of phosphogypsum leachate, belonging to the field of environmental protection monitoring methods. [0002] technical background [0003] The output of phosphogypsum is huge and increases year by year with the development of agriculture and phosphorus chemical industry. Due to the complex composition of phosphogypsum and the high cost of purification treatment, phosphogypsum is far from reaching the balance between production and use, resulting in a large amount of phosphogypsum stockpiling. The storage methods of phosphogypsum mainly include dry pile and wet pile, but whether it is the free water generated by dry pile or the process water generated by wet pile, it will gradually increase with the prolongation of the storage time of phosphogypsum. Seeps out to form leachate. These leachates produced by phosphogypsum are not onl...

Claims

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Application Information

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IPC IPC(8): G01N1/40
CPCG01N1/40G01N1/405
Inventor 谢燕华牟诗萌吴子凡程敏杨欣楠王旭
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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