Method for hydrothermal synthesis of alkaline arsenate-iron sulfate solid solution
A technology of hydrothermal synthesis and iron sulfate, which is applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of secondary pollution of arsenic, and achieve the effect of low economic cost and easy material preparation
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Embodiment 1
[0017] Weigh 3.9988 g iron sulfate (Fe 2 (SO 4 ) 3 ∙ xH 2 (0, 399.88) was placed in a beaker filled with 50 mL of ultrapure water, and stirred for 30 min; added 10 mL of 1 mol / L arsenic acid solution and 40 mL of ultrapure water into the above beaker, and continued to stir for 30 min; the solution was transferred into a 200 mL reactor, reacted in an oven at 200°C for 24 h, took out the reactor, and cooled to room temperature naturally; then the product was subjected to solid-liquid separation, and the solid-phase precipitate was washed three times with ultrapure water, each time with ultrapure water The dosage was 50 mL, and the washed product was placed in a porcelain dish and dried in an oven at 110 °C for 24 h to obtain Fe 3+ / AsO 4 3- =2 basic arsenic acid-iron sulfate solid solution.
[0018] Leaching test: Dissolving at pH 2 for 180 days, the leaching concentration of arsenic was 0.0671 mmol / L.
[0019] The arsenic leaching concentration was 0.0076 mmol / L after di...
Embodiment 2
[0022] Weigh 5.9982 g iron sulfate (Fe 2 (SO 4 ) 3 ∙ xH 2 (0, 399.88) was placed in a beaker filled with 50 mL of ultrapure water, and stirred for 30 min; added 10 mL of 1 mol / L arsenic acid solution and 40 mL of ultrapure water into the beaker, and continued to stir for 30 min; the solution was transferred into a 200 mL reactor, reacted in an oven at 200°C for 24 h, took out the reactor, and cooled to room temperature naturally; then the product was subjected to solid-liquid separation, and the solid-phase precipitate was washed three times with ultrapure water, each time with ultrapure water The dosage was 50 mL, and the washed product was placed in a porcelain dish and dried in an oven at 110 °C for 24 h to obtain Fe 3+ / AsO 4 3- =3 basic arsenic acid-iron sulfate solid solution.
[0023] Leaching test: Dissolving at pH 2 for 180 days, the leaching concentration of arsenic was 0.0751 mmol / L.
[0024] The arsenic leaching concentration was 0.0008 mmol / L after dissolut...
Embodiment 3
[0027] Weigh 5.9982 g iron sulfate (Fe 2 (SO 4 ) 3 ∙ xH 2 (0, 399.88) was placed in a beaker filled with 50 mL of ultrapure water, and stirred for 30 min; added 15 mL of 1 mol / L arsenic acid solution and 35 mL of ultrapure water into the beaker, and continued to stir for 30 min; the solution was transferred into a 200 mL reactor, reacted in an oven at 200°C for 24 h, took out the reactor, and cooled to room temperature naturally; then the product was subjected to solid-liquid separation, and the solid-phase precipitate was washed three times with ultrapure water, each time with ultrapure water The dosage was 50 mL, and the washed product was placed in a porcelain dish and dried in an oven at 110 °C for 24 h to obtain Fe 3+ / AsO 4 3- =2 basic arsenic acid-iron sulfate solid solution.
[0028] Leaching test: Dissolving at pH 2 for 180 days, the leaching concentration of arsenic was 0.0613 mmol / L.
[0029] The arsenic leaching concentration was 0.0126 mmol / L after dissolut...
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