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Method for recovering lead from lead-containing material by matching leaching-electrowinning method

A material and leaching technology, applied in the direction of process efficiency improvement, photographic technology, instruments, etc., can solve environmental and human health hazards and other problems, and achieve the effects of easy operation, reduced environmental pollution, and simple process flow

Inactive Publication Date: 2011-10-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The lead slag with very low content is piled up as waste, and the leached water contains Pb 2+ , causing great harm to the environment and human health

Method used

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  • Method for recovering lead from lead-containing material by matching leaching-electrowinning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]Zinc oxide soot, a by-product of lead smelting in a factory, material composition (%): Zn 52.43, Pb 12.44, Cu 0.04, In 0.0199, S 3.2, Cl 0.06, F 0.084, As 0.32, Sb 0.047.

[0039] Disodium edetate 0.15mol / L, NaOH 0.2mol / L solution, weigh suboxide soot according to the solid-to-liquid ratio of 200g / L, add it into the reactor, control the reaction temperature at 90°C, stir and leaching for 2.0h , the lead in the secondary zinc oxide soot enters the leachate in the form of Pb(EDTA) complex, the slag contains 1.06% of Pb, and the pH value of the leachate is 10. During the leaching process, the leaching rate of lead was 93.65%, and the leaching rate of zinc was only 4.24%.

[0040] The leaching solution contains 22.04g / L of lead, and stainless steel is used as the cathode, coated with PbO 2 The titanium plate is the anode, at 20-30°C, the current density is 100A / m 2 Electrowinning was carried out at 1.7-2.2V for 10 hours, the waste liquid contained 1.8g / L of lead, and the c...

Embodiment 2

[0042] A zinc sulfate factory produces acid leaching lead slag, material composition (%): Zn 3.89, Pb18.16, In 0.025, SO 4 2- 14.2, Fe0.56, Cu0.05, Sb1.47, Bi0.85, Ca1.20.

[0043] CaEDTA 0.3mol / L, the solution of CaO 1.0mol / L, according to the solid-liquid ratio is 150g / L to take lead-containing slag, add in the ball mill reactor together, control reaction temperature to be normal temperature, the ratio of ball and slurry is 1kg: 10L, ball milling reaction time 0.5h, make PbSO 4 The lead in the slag enters the leaching solution in the form of PbEDTA complex, SO 4 2- CaSO 4 The form of slag remains in the slag, the leaching slag contains 0.64% Pb, and the leaching rate of lead during the leaching process is 96.65%.

[0044] The leachate contains 27.08g / L of lead, stainless steel is used as the cathode, and PbO is coated 2 The titanium plate is the anode, at 40°C, the current density is 400A / m 2 Electrowinning was carried out at 2.0-2.5V for 12 hours, the waste liquid c...

Embodiment 3

[0046] A wet zinc plant produces high acid leaching slag, the material composition (%) is: Zn 8.21, Pb 7.76, Ag 0.162, Ge 0.015, Fe13.76, SO 4 2- 4.2, SiO 2 25.34.

[0047] CaEDTA 0.4mol / L, the solution of CaO 0.5mol / L, according to the solid-liquid ratio is 300g / L to take lead-containing slag, add in the ball mill reactor together, control reaction temperature to be normal temperature, the ratio of ball and slurry is 1kg: 30L, ball milling reaction time 1.0h, make PbSO 4 The lead in the slag enters the leaching solution in the form of PbEDTA complex, SO 4 2- CaSO 4 The form of slag remains in the slag, the leaching slag contains 0.48% of Pb, the leaching rate of lead is 93.52%, and the leaching rate of silver is 85%.

[0048] The leaching solution contains 21.24g / L of lead, stainless steel is used as the cathode, and IrO is coated 2 The titanium plate is the anode, at 45°C, the current density is 200A / m 2 Electrowinning was carried out at 1.7-2.2V for 24 hours, the ...

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Abstract

The invention discloses a method for recovering lead from a lead-containing material by matching a leaching-electrowinning method. The method comprises the following steps of: selectively leaching the lead from the lead-containing material at the temperature of -95DEG C by using a mixture of 0.005-0.5M ethylenediaminotetraacetateedetate and 0.05-1.0M alkali as a leaching agent, and filtering and separating to obtain a lead-containing solution; and separating out metal lead powder from the solution by using an electrowinning method, blending electrowinning waste liquor, and returning to the leaching step. By leaching lead from secondary zinc oxide soot, the grade of zinc in secondary zinc oxide and the leaching rate of subsequent leaching can be improved, and subsequent treatment is facilitated; and by leaching lead from low-grade lead slag containing lead oxide, lead sulfate or lead chloride, the leached sewage in the slag piling process never contains lead or contains little lead, environment is not affected, the waste is changed into treasure, and the lead can be recovered from the lead slag. The method has the advantages of simple flow, simple operation, low energy consumption and the like, and can be widely used for treating lead-containing secondary zinc oxide materials and low-grade lead slag.

Description

technical field [0001] The invention discloses a new process for leaching lead from lead-containing materials and recovering lead by electrowinning by using an alkaline solution of ethylenediamine tetraacetate, which belongs to the fields of secondary resource recovery and nonferrous metal hydrometallurgy. Background technique [0002] Secondary zinc oxide soot is an intermediate product in the metallurgical process of lead and zinc. It is a zinc- and lead-containing fume deposited in the flue produced during the fuming process of the lead blast furnace slag fuming furnace. At present, after removing fluorine and chlorine by multi-hearth furnace or pickling, it is used for the production of metal zinc by sulfuric acid method, and the lead enters the acid leaching slag to obtain lead sulfate slag containing 10-30% lead, and the obtained low-grade lead slag and The lead concentrate is fed into pyrometallurgical lead smelting. The recovery rate of zinc in this method is low, an...

Claims

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Application Information

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IPC IPC(8): C22B3/12C22B7/00C25C1/18C22B13/00
CPCY02P10/20
Inventor 杨声海刘青陈永明何静
Owner CENT SOUTH UNIV
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