Sulfide ore acid leaching - acid leaching of high impurity containing brass concentrate

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    Acid leaching at high temperature oxidation, arsenic, antimony, and other secret precipitated together with the iron metal. When the temperature as a main acid leaching of copper ore concentrate Heiyou sample component is: Cu 26.5%, Sb 13.2% , As 6.8%, Fe 2.0%, Zn 2.9%, S 19.4%, Ag 0.27%, prior Add ferrous sulfate to make Fe/(As + Sb) = 1.5/1 ( mol) . in 220 ° C With a partial pressure of oxygen of 600 kPa , the leaching rates of copper and zinc reached 95.4% and 95.0%, respectively . The slag is leached with silver chloride solution and the leaching rate reaches 95.4% [1] .
In addition to producing iron arsenate

Fe 2 ( S0 4 ) 3 + 2H 3 As0 4 ==== 2FeAs0 4 + 3H 2 S0 4

Iron ions and arsenate also form basic salts

2Fe 2 ( S0 4 ) 3 + 2H 3 As0 4 +( 2 + n ) H 2 0 ==== 2Fe 2 ( As0 4 )( S0 4 ) OH·nH 2 0 + 4H 2 S0 4

Common arsenic and beryllium copper ores include Cu 2 Sb 4 S 13 , Cu 3 AsS 4 and Cu 12 As 4 S 13 . High pressure leaching containing one (%): Cu 22.6 , Sb 0.5 , As 8.6 , Fe 18.0 , S 35.4 , Ag 61g /t , Au 844g /t concentrate. in 200 ° C Dip or 3h 220 ° C After leaching for 1 h , the oxidation rate of sulfur reached 99% , and almost all of the antimony and more than 94% of the arsenic precipitated into the slag. The leaching rate of copper is 95% to 98% because dissolved copper forms a precipitate containing Fe-Cu-As-S-0 . Increasing the leaching temperature increases the amount of unstable sulfate precipitated and consumes more lime during cyanidation. 220 ° C Leaching cyanide leaching gold when consuming lime 130kg /t , and 200 ° C Leaching slag only consumes 50kg /t . The recovery rate of gold cyanide is between 87% and 96 %. The recovery rate of silver is very low because of the formation of silver pyrite salt.

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