The chemical nature of arsenic depends mainly on its oxidized state, namely trivalent arsenic and pentavalent arsenic.
1. Trivalent arsenic As3+, its solid materials are usually in the form of As2O3, and in the liquid, arsenide-arsenic acid cations exist. Crystalline salts are common sodium arsenite, silver arsenite and copper arsenite. The dissociation of arsenious acid is as follows:
2. Pentavalent arsenic As5+, see the form of As2O5. Pentavalent arsenic acid is crystallized into a tribasic acid and is represented by the 2AsO4H3 • H2O molecular formula.
Dissociation balance in solution:
Arsenic similar electronic structure and atomic radii phosphorus phase, and thus the chemical nature of these two elements is also very similar, especially positive pentavalent acid acidity almost the same, thereby taking advantage of these properties to improve the efficiency of removal of arsenic from water. Natural mineral mainly arsenic enargite (Cu3AsS4), arsenic trisulfide or said female yellow (As2S3), arsenic ore cobalt (Co AsS2), said arsenic pyrite or arsenopyrite (FeAsS) and the like, pH of these minerals The value is neutral and slightly soluble in water. When the useful symbiotic element gold is recovered by chemical treatment, it will be converted into a readily soluble arsenic compound. For example, in the process of recovering gold from sulfide ore, the ore is acidified and roasted, and the arsenic becomes a fine powdery arsenic oxide. It is dissolved in the liquid phase by gas phase and roasting ore and needs to be treated, otherwise it will pollute the environment. .
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