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Experimental Study on Formation Conditions of Ammoniojarosite and Its Environmental Significance
Author(s) -
Changqiu WANG,
Shengfeng MA,
Anhuai LU,
Jiangong ZHOU
Publication year - 2006
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.2006.tb00246.x
Subject(s) - jarosite , precipitation , chemistry , hydroxide , wastewater , sodium hydroxide , colloid , deposition (geology) , inorganic chemistry , environmental engineering , environmental science , geology , organic chemistry , paleontology , physics , sediment , meteorology
Formation conditions of ammoniojarosite in system Fe 2 (SO 4 ) 3 ‐(NH 4 ) 2 SO 4 ‐H 2 O are investigated in this paper. The results show that ammoniojarosite can be formed rapidly under normal temperature and pressure by controlling suitable pH value and Fe 2 (SO 4 ) 3 and (NH 4 ) 2 SO 4 concentrations. The pH value, temperature and concentration of Fe 2 (SO 4 ) 3 medium are key factors influencing the formation of ammoniojarosite. Under normal temperature, precipitation of ammoniojarosite can be seen within 24 hours at pH values between 2.6‐3.1, and a great quantity of ammoniojarosite is formed within 48 hours. At about 90°C, the pH value range forming ammoniojarosite extends to 1.2–3.1, and within this range the rise of pH value is advantageous to the formation of ammoniojarosite and high Fe 2 (SO 4 ) 3 concentration is also advantageous. Relative pure ammoniojarosite is synthesized under high Fe 2 (SO 4 ) 3 concentration (≥0.05 M) and ammoniojarosite containing melanterite and colloid amorphous hydroxide vitriol iron is formed at low Fe 2 (SO 4 ) 3 concentration. The deposition process of ammoniojarosite can be used to harness wastewater from mines and other industries and remove S, Fe and other toxic and harmful elements, such as As, Cr, Hg, Pb in water. Rapid formation of ammoniojarosite and other jarosite analogs under normal temperature and pressure has a good potential prospect for harnessing acid wastewater by means of precipitation of jarosite and its analogs.