Method for preparing high-stability solid arsenic minerals through distributed crystallization method
A technology with high stability and distributed crystallization, which is applied in the field of mineral arsenic fixation to achieve the effects of small BET specific surface area, high crystallinity and mild reaction conditions
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Embodiment 1
[0039] 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.
[0040] 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%.
[0041] Adjust the pH value of the oxidized solution to 1.5, and add CaO and Ca(OH) in a continuous feeding mode 2As 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 co...
Embodiment 2
[0043] 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.
[0044] 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%;
[0045] 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-fixed minerals adopts the distributed crystallization method, and the control c...
Embodiment 3
[0047] 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.
[0048] 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 was controlled at 20:1, and the temperature of the catalytic oxidation system was controlled at 120°C. The results showed that As 3+ The conversion rate is 89.36%
[0049] 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. Synthesis of arsenic-fixed minerals adopts the distributed crystallization method, and the control co...
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