Lead hydrometallurgical technology through utilizing lead sulfate
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A technology of lead sulfate and zinc hydrometallurgy, applied in the direction of improving process efficiency, etc., can solve problems such as not realizing large-scale production
Active Publication Date: 2013-07-10
YUNNAN XIANGYUNFEILONG RESOURCES RECYCLING TECH CO LTD
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[0007] In the world where environmental protection requirements are getting higher and higher and environmental pressure is increasing, PbSO 4 The wet treatment of materials is one of the research hotspots in the metallurgical and environmental protection circles in the world, but there are various problems in all of them, and large-scale production has not been realized.
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example 1
[0075] Example 1: Leaching
[0076] An enterprise volatilized zinc oxide in a kiln, and leached lead sulfate slag after recovering zinc and indium. The slag contains 21.89% lead, all of which are lead sulfate, containing 3.5% Zn and 10.2% S.
[0077] The leaching solution is a chloride salt solution, NaCl 280g / L, Ca 2+ 13g / L. Leaching conditions: Add 500g (dry weight) of slag to 5L of leaching solution, leaching under stirring conditions, liquid-solid ratio 10:1, temperature 80°C, leaching time 1.5 hours, leaching end point pH 4.5.
[0078] The leach residue contains 0.9% Pb, the leach residue rate is 96%, and the leach solution contains Pb 21.1 g / L.
example 2
[0079] Example 2: Leaching
[0080] A company leached lead and silver slag with high acid, containing Pb 15.54% (dry basis), sampled 588g, added 5L containing Ca 2+ 14g / L, NaCl 260g / L leaching solution, stirring and leaching at 80°C for 1.5 hours, the filtered and dried leaching residue weighed 451g, containing 1.36% Pb. The leaching solution + washing water totaled 5.32L, containing 16.0g / L Pb, and the Pb leaching rate was 93.15% %.
example 3
[0081] Example 3: Leaching
[0082] Lead paste leaching of waste lead-acid batteries: In the battery recycling workshop of a lead smelter, the dismantled lead sludge contains 76.04% lead (dry basis). Take 100g of lead paste, 2L of leachate, and the ingredients of the leachate are NaCl 320g / L, HCl 20g / L, the leaching temperature is 85°C, the leaching time is 2 hours, the pH of the leaching end point is 2.0, and Ca(OH) is added 2 Adjust the pH to 4.5. After filtration, the filtrate + washing water is 2.1L, containing 34.8g / L of Pb, and the lead leaching rate is 96%.
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Abstract
The invention discloses a lead hydrometallurgical technology through utilizing lead sulfate, belongs to a hydrometallurgical technology, and relates to a technology which adopts a full-hydrometallurgical technology to produce lead through lead sulfate residuals or lead storage battery lead slime which is additionally produced in a zinc hydrometallurgical process. The method comprises steps of: with CaCl2 and NaCl as a leaching solvent; leaching high leaching residuals generated by zinc hydrometallurgy and containing lead sulfate, lead skims generated by leaching zinc out of lead-containing zinc oxides or the lead slimes generated by dismantling lead-acid storage batteries; using zinc to replace lead in the leaching solution; recovering zinc from the replacing solution; returning the recovered zinc to a lead replacement process; and circulating a Cl<->-containing liquid after zinc recovery to a lead sulfate chloride leaching process. The technology has the characteristics of low energy consumption, low cost and easiness in popularization and application; and smoke pollutions such as lead fume, lead dust and SO2 are thoroughly eliminated by utilizing the technology.
Description
technical field [0001] The invention belongs to hydrometallurgical technology, and relates to a technology for producing lead by using a full hydrometallurgical process for lead sulfate slag produced by hydrometallurgy or lead storage battery lead sludge. technical background [0002] The zinc hydrometallurgy raw material contains 1 to 4% lead. When zinc calcine adopts high-acid leaching goethite iron precipitation or jarosite iron precipitation process, lead is enriched in high leaching slag during the zinc leaching process. The form of lead is almost always PbSO 4 . When the leaching slag is treated by pyrolysis, lead and zinc volatilize into the smoke at the same time. After further treatment of the smoke and leaching zinc, the lead is concentrated in the leaching slag, and its form is PbSO 4 . [0003] Other zinc-containing materials, such as iron and steel factory smoke and copper smelter smoke, etc., after pyro-reduction and volatilization, zinc oxide also contains ...
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Patent Type & Authority Applications(China)
IPC IPC(8): C22B13/00C22B7/00
CPCC22B3/10C22B3/46C22B13/045C22B19/30Y02P10/20
Inventor 舒毓璋田喜林
Owner YUNNAN XIANGYUNFEILONG RESOURCES RECYCLING TECH CO LTD
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