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 I. Chemical phase analysis of arsenic in odorous onion ore
After severely weathering the sulfide ore, most of the arsenic sulfide is oxidized to secondary scorodite; when lead is present, part of the arsenic ore is formed. Dissolved arsenic acid NaCL solution galena, pyrite arsenic dissolved in dilute HNO 3, scorodite in both solvent extraction rate of about 1%.
Determination of arsenic ore  Weigh 0.2000-0.5000g into a conical flask, add 50mL 0.5% HCL-150g / L NaCl solution, shake at room temperature for 15min. Filter and wash. Arsenic was measured in the filtrate.
Determination of arsenopyrite In the above residue, 50 mL of preheated 20% HNO 3 was added and immersed in a boiling water bath for 15 min. Filtration, washing, and determination of arsenic in solution.
Determination of scorodite The above residue was placed in a beaker, 15 mL of HNO 3 , 5 mL of HClO 4 was added to decompose the sample, and H 2 SO 4 was added to prepare a solution, and arsenic in the solution was measured.
2. Chemical phase analysis of arsenic in tin ore
(one) Â Method overview
Cassiterite ore belongs oxide, arsenic mainly copper ore minerals are calcium, arsenic, lead, arsenic, arsenic and iron pyrite.
Separation of arsenic and lead ore The arsenic and lead ore forms soluble Na 2 PbO 2 in NaOH solution. If the amount of alkali is insufficient, Pb(OH) 2 precipitates. When sodium tartrate is present, it can form stable lead tartrate with Pb(OH) 2 . After leaching with 20g/L NaOH-10g/L sodium tartrate solution at room temperature for 1h, the arsenic ore leaching rate was 95.27%, arsenic calcium-copper ore was 3.06%, arsenic pyrite was 4.93%, and arsenic-containing iron ore was 4.44%.
Separation of arsenic calcium copper ore The arsenic calcium copper ore is rapidly soluble in many organic and inorganic acids. Leaching with ESTA solution at 90 °C, the leaching rate can reach 98%, arsenic pyrite is 0.86%, and arsenic-containing iron ore is 1.82%.
Separation of arsenic-bearing iron ore The arsenic-containing iron ore is an iron mineral that contains arsenic. When argon is used to dissolve iron minerals, arsenic is easily lost. In H 2 SO 4 (1+1) medium, leaching on a boiling water bath for 2 h, the iron mineral leaching rate was 86%, and the arsenic leaching rate was 98%. After adding an appropriate amount of oxalic acid, the iron leaching rate is greater than 90%, arsenic is 100%, and arsenic pyrite is 1.43%.
(two) analysis steps
Determination of arsenic ore The sample was placed in a plastic beaker, and 1 g of sodium tartrate, 100 mL of 20 g/L NaOH solution was added, and immersed in a boiling water bath for 1 hour, filtered, washed with water containing NH 4 Cl, and arsenic was measured in the filtrate.
Calcium Copper Determination of arsenic in the residue into the conical flask, add 100mL10g / LEDTA solution, boiling water bath to leach IH, add hot 0.5gNH 4 Cl, filtered, washed with NH 4 Cl containing hot water. Arsenic was measured in the filtrate.
Determination of arsenic-containing iron ore. The residue of arsenic calcium-copper ore was added to the residue of arsenic calcium-copper ore, and 1 g of oxalic acid was added. 100 mL of H 2 SO 4 (1+1) was immersed in a boiling water bath for 2 h, filtered, washed with hot water, and arsenic was measured in the filtrate. .
Determination of arsenic pyrite In the final residue, add 50mL HNO 3 , heat in boiling water bath for 10min, add 0.2-0.5gKClO 3 , continue to heat and decompose for 30min, add 50mL water, filter, wash with hot water, measure in filtrate Irregular arsenic.