Preparing method for high-stability solid arsenic mineral
A high stability, mineral technology, applied in the field of mineral arsenic fixation, to achieve the effect of small BET specific surface area, low equipment requirements, and wide stable area
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Embodiment 1
[0045] The main components in the arsenic solution include: As 60g / L, Sb 1.1g / L, Pb 235ppm, Sn 38.5ppm, Te24.4ppm, NaOH 30g / L.
[0046] A kind of preparation method of highly stable arsenic-fixed mineral, comprises the following steps: arsenic-containing solution adopts the method for catalytic oxidation to As 3+ Oxidized to As 5+ , the control conditions are, the oxygen flow rate is 5L / min, adding KMnO 4 As a catalyst, the molar ratio of As / Mn is controlled at 10:1, and the temperature of the catalytic oxidation system is controlled at 90°C. The results show that As 3+ The conversion rate was 98.45%.
[0047] Adjust the pH value of the oxidized solution to 1.5, and add CaO and Ca(OH) in a continuous feeding mode 2 As an arsenic precipitating agent, the Ca / As molar ratio is 5, the settling time is 6 hours, and the reaction temperature is 60° C. to generate calcium arsenate. Synthesis of arsenic-fixed minerals adopts the distributed crystallization method, and the control c...
Embodiment 2
[0049] The main components in the arsenic solution include: As 76g / L, Sb 0.8g / L, Pb 96.7ppm, Sn 27.5ppm, Te38.7ppm, NaOH 25g / L.
[0050] A kind of preparation method of highly stable arsenic-fixed mineral, comprises the following steps: arsenic-containing solution adopts the method for catalytic oxidation to As 3+ Oxidized to As 5+ , the control conditions are, oxygen flow rate is 10L / min, adding KMnO 4 As a catalyst, the molar ratio of As / Mn was controlled at 40:1, and the temperature of the catalytic oxidation system was controlled at 30°C. The results showed that As 3+ The conversion rate is 92.31%;
[0051] Adjust the pH value of the oxidized solution to 2, and add CaO and Ca(OH) in a continuous feeding mode 2 As the arsenic precipitating agent, the Ca / As molar ratio is 8, the settling time is 8 hours, and the reaction temperature is 90° C. to generate calcium arsenate. Synthesis of arsenic-fixing minerals adopts a regulated growth method. The control conditions are to...
Embodiment 3
[0053] The main components in the arsenic solution include: As 50g / L, Sb 1.8g / L, Pb 186ppm, Sn 34.7ppm, Te27.8ppm, NaOH 5g / L.
[0054] A kind of preparation method of highly stable arsenic-fixed mineral, comprises the following steps: arsenic-containing solution adopts the method for catalytic oxidation to As 3+ Oxidized to As 5+ , the control conditions are, oxygen flow rate is 1L / min, adding KMnO 4 As a catalyst, the molar ratio of As / Mn is controlled at 20:1, and the temperature of the catalytic oxidation system is controlled at 120°C. The results show that As 3+ The conversion rate is 89.36%
[0055] Adjust the pH value of the oxidized solution to 1.5, and add CaO and Ca(OH) in a continuous feeding mode 2 As an arsenic precipitating agent, the Ca / As molar ratio is 5, the settling time is 10 hours, and the reaction temperature is 60° C. to generate calcium arsenate. The synthesis of arsenic-fixing minerals adopts the hydrothermal method, and the control conditions are a...
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