Method for precipitating arsenic in acid complex arsenic-containing solution at constant pressure
A solution and complex technology, applied in chemical instruments and methods, inorganic chemistry, energy input, etc., can solve the problems of arsenic entry, secondary pollution, etc., and achieve the effect of small amount of slag, strong adaptability, and easy clarification and separation
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Embodiment 1
[0021] Such as figure 1 As shown, the method for sinking arsenic in the acidic complex arsenic solution under atmospheric pressure, first adjusts the pH of the acidic complex arsenic solution, then adds ferrous salt, and feeds preheated air or oxygen to slowly oxidize ferrous iron and trivalent iron. Iron reacts with pentavalent arsenic to generate crystalline iron arsenate, and the specific steps are as follows:
[0022] Step 1. Add sulfuric acid to the acidic complex arsenic-containing solution (arsenic concentration 70g / L, sulfate concentration 200g / L, Zn150g / L and Cu0.96g / L) to adjust the pH to 0.3;
[0023] Step 2. Heat the solution after the pH adjustment in step 1 to 95°C, add ferrous salt (ferrous sulfate) according to the molar ratio of the arsenic content in the solution to the iron in the ferrous salt is 1:1.5, and then add 1g Stir (500r / min) for / L scorodite crystals evenly, feed oxygen (5L / min) preheated to 85°C to react for 1, 3, 5, 7, 10, 15 or 20 hours respect...
Embodiment 2
[0026] Such as figure 1 As shown, the method for sinking arsenic in the acidic complex arsenic solution under atmospheric pressure, first adjusts the pH of the acidic complex arsenic solution, then adds ferrous salt, and feeds preheated air or oxygen to slowly oxidize ferrous iron and trivalent iron. Iron reacts with pentavalent arsenic to generate crystalline iron arsenate, and the specific steps are as follows:
[0027] Step 1. Add acidic complex arsenic-containing solution (arsenic concentration 5g / L, sulfuric acid concentration 10g / L, Zn4.97g / L and Cu20g / L) into sulfuric acid to adjust the pH to 0.5;
[0028] Step 2. Heat the solution after the pH adjustment in step 1 to 80°C, add ferrous salt (ferrous sulfate) according to the molar ratio of the arsenic content in the solution to the iron in the ferrous salt is 1:1.0, and then add 10g / L scorodite crystals were stirred (60r / min) evenly, and the air (0.2L / min) preheated to 80°C was introduced to react for 10h in turn, and...
Embodiment 3
[0032] Such as figure 1 As shown, the method for sinking arsenic in the acidic complex arsenic solution under atmospheric pressure, first adjusts the pH of the acidic complex arsenic solution, then adds ferrous salt, and feeds preheated air or oxygen to slowly oxidize ferrous iron and trivalent iron. Iron reacts with pentavalent arsenic to generate crystalline iron arsenate, and the specific steps are as follows:
[0033]Step 1. Add sulfuric acid to the acidic complex arsenic-containing solution (arsenic concentration 40g / L, sulfate concentration 90g / L, Zn100g / L and Cu10g / L) to adjust the pH to 1.0;
[0034] Step 2. Heat the solution after the pH adjustment in step 1 to 80°C, add ferrous salt (ferrous sulfate) according to the molar ratio of the arsenic content in the solution to the iron in the ferrous salt is 1:1.2, and then add 100g Stir (500r / min) for / L scorodite crystals evenly, pass in oxygen-enriched air (90% oxygen concentration, v / v, 2L / min) preheated to 85°C for re...
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