Arsenic fixing method for preparing scorodite through stabilization treatment of arsenic-alkali residue
A technology for stabilization treatment and arsenic-alkali slag, applied in chemical instruments and methods, inorganic chemistry, iron compounds, etc., can solve the problems of secondary pollution costs, etc., and achieve the effect of simple and energy-saving equipment, simple reaction operation, and high uniformity
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[0028] Example 1
[0029] Take 900g of arsenic-alkali slag, use liquid-solid ratio L / S as 4:1, leaching temperature 85℃ and leaching time 45min as leaching conditions, and add 30% excess H 2 O 2 The solution is oxidized. After the reaction, the solid-liquid separation is carried out, and the antimony-containing precipitate is returned to the antimony smelting system; the leaching liquid is concentrated by half, and CO 2 To pH 8.0. Add concentrated sulfuric acid to the filtered leachate to remove the remaining alkali, stand still, filter to obtain the required arsenic-rich solution, and analyze the As concentration in the solution by inductively coupled plasma optical emission spectrometer (ICP-OES) to be 16.5g / L;
[0030] Measure 30mL of the above arsenic-rich solution, and prepare FeSO according to the Fe / As molar ratio of 1.5 4 Solution, use appropriate amount of 30% H 2 O 2 After the solution oxidizes Fe(II), the iron-arsenic solution is mixed uniformly, the pH is adjusted to ...
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[0032] Example 2
[0033] The scorodite was prepared according to the method of Example 1, the initial pH value in the reaction system was controlled to be 1.8, and the rest of the reaction conditions remained unchanged, and the obtained precipitate was characterized as scorodite crystals by XRD.
[0034] Leaching toxicity test: Refer to "Method 1311: ToxicityCharacteristic Leaching Procedure" promulgated by the US Environmental Protection Agency in 1992 for leaching toxicity test, and determine the leaching concentration of As in the filtrate to be 0.21mg / L, which has high environmental stability and can be stored safely .
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[0035] Example 3
[0036] The scorodite was prepared according to the method of Example 1, the Fe / As molar ratio in the reaction system was controlled to be 2.0, and the rest of the reaction conditions were kept unchanged, and the obtained precipitate was characterized as scorodite crystals by XRD.
[0037] Leaching toxicity test: Refer to "Method 1311: ToxicityCharacteristic Leaching Procedure" promulgated by the US Environmental Protection Agency in 1992 for leaching toxicity test. Determine the leaching concentration of As in the filtrate to be 0.53mg / L. It has high environmental stability and can be stored safely. .
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