A method for extracting selenium from smelting slag containing selenium
A smelting slag and leaching technology, which is applied in the field of selenium extraction from selenium-containing smelting slag, can solve the problems of low selenium leaching efficiency, low crude selenium grade, high production cost, etc., achieve high reduction efficiency, improve economic benefits, and increase leaching rate Effect
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Embodiment 1
[0037] Step 1. Concentrated sulfuric acid with a mass fraction of 98% and concentrated hydrochloric acid with a mass fraction of 30% are configured at a volume ratio of 2:1 to form a mixed acid with an initial acid concentration of 300g / L (converted into sulfuric acid concentration).
[0038] Step 2: Leach selenium-containing smelting slag according to the liquid-solid ratio of 4:1, the leaching temperature is 85°C, the leaching time is 3h, and the air pressure is 0.1Mpa; after the leaching is completed, the solution is filtered, and the obtained leachate contains Se 21.78g / L, Se leaching rate is 98.2%.
[0039] Step 3. Add iron powder with a selenium content of 0.2 times to the above leaching solution, the reaction temperature is 40°C, and the reaction time is 2 hours; then, add thiourea with a selenium content of 0.4 times, the reaction temperature is 40°C, and the reaction time is 2 hours; finally, add a selenium content of 1.3 twice as much sodium sulfite, the reaction tem...
Embodiment 2
[0041] Step 1. Concentrated sulfuric acid with a mass fraction of 98% and concentrated hydrochloric acid with a mass fraction of 30% are configured at a volume ratio of 2:1 to form a mixed acid with an initial acid concentration of 330g / L (converted into sulfuric acid concentration).
[0042] Step 2. Leach the selenium-containing smelting slag according to the liquid-solid ratio of 5:1, the leaching temperature is 90°C, the leaching time is 3.5h, and the air pressure is 0.15Mpa. After the leaching was completed, the solution was filtered, and the obtained leaching solution contained Se 18.42g / L, and the Se leaching rate was 98.8%.
[0043] Step 3. Add iron powder with a selenium content of 0.25 times to the above leaching solution, the reaction temperature is 45°C, and the reaction time is 2.5 hours; then, add thiourea with a selenium content of 0.5 times, the reaction temperature is 45°C, and the reaction time is 2.5 hours; finally, add selenium The content of sodium sulfite ...
Embodiment 3
[0045] Step 1. Concentrated sulfuric acid with a mass fraction of 98% and concentrated hydrochloric acid with a mass fraction of 30% are configured in a volume ratio of 2:1 to form a mixed acid with an initial acid concentration of 350g / L (converted into sulfuric acid concentration).
[0046] Step 2, leaching the selenium-containing smelting slag according to the liquid-solid ratio of 6:1, the leaching temperature is 95°C, the leaching time is 4h, and the air pressure is 0.2Mpa; after the leaching is completed, the solution is filtered, and the obtained leachate contains Se 14.62g / L, The Se leaching rate is 99%.
[0047] Step 3. Add iron powder with a selenium content of 0.3 times to the above leaching solution, the reaction temperature is 50° C., and the reaction time is 3 hours. Then, thiourea with a selenium content of 0.6 times was added, the reaction temperature was 50° C., and the reaction time was 3 h. Finally, sodium sulfite with a selenium content of 1.5 times was adde...
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