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Process for preparing lead by ammonium sulfate through ammonia power reduction

An ammonium sulfate and process technology, which is applied in the field of ammonium sulfate ammonia electroreduction to produce lead, can solve the problems of high energy consumption and environmental pollution of lead smoke and dust, and achieve the effects of low power consumption, low equipment corrosion, and low energy consumption

Active Publication Date: 2016-11-02
杨云婷
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, this kind of material is recovered by pyromelting, which not only consumes a lot of energy, but also produces harmful substances such as lead fumes, sulfur dioxide, and dioxins during the smelting process, which seriously pollutes the environment.

Method used

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  • Process for preparing lead by ammonium sulfate through ammonia power reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] (1) Take 500g of waste lead-acid battery lead paste, containing Pb75.04% (wherein Pb5.2%, PbSO 4 41.06%, PbO 2 44.32%, PbO3.65%);

[0061] (2) get two pieces of titanium nets that are coated with iridium and ruthenium coating as anodes, the width of the anode is 10cm, and the height is 20cm;

[0062] (3) Get a piece of stainless steel as the cathode, the width of the cathode is 10cm, and the height is 20cm;

[0063] (4) Preparation of liquid before electrolysis: prepare 5L of 2mol / L ammonium sulfate solution, add 200ml of ammonia water;

[0064] (5) Reduction: constant voltage mode 2.3v voltage, carry out reduction for 24 hours, use ammonia water to control PH8-9, after reduction is completed, leave the tank;

[0065] (6) The reduced lead weighs 379.8g after compaction, and the result of sampling analysis is Pb98.6%.

[0066] Main technical indicators: initial current 10.5A, peak current 20.5A, reduction power consumption 377.5wh, power consumption per ton of lead ...

Embodiment 2

[0068] (1) Take 500g of waste lead-acid battery lead paste, containing Pb75.04% (wherein Pb5.2%, PbSO 4 41.06%, PbO 2 44.32%, PbO3.65%);

[0069] (2) get two pieces of titanium nets that are coated with iridium and ruthenium coating as anodes, the width of the anode is 10cm, and the height is 20cm;

[0070] (3) Take a piece of lead plate as the cathode, the width of the cathode is 10cm, and the height is 20cm;

[0071] (4) Preparation of liquid before electrolysis: prepare 5L of 2mol / L ammonium sulfate solution, add 200ml of ammonia water;

[0072] (5) Reduction: constant voltage mode 2.5v voltage, carry out reduction for 20 hours, use ammonia water to control PH 8-9, after the reduction is completed, leave the tank;

[0073] (6) The reduced lead weighs 380.1g after compaction, and the result of sampling analysis is Pb98.1%.

[0074] Main technical indicators: initial current 12A, peak current 23A, reduction power consumption 411wh, power consumption per ton of lead 1094k...

Embodiment 3

[0076] (1) make anode with two titanium nets that are coated with iridium ruthenium coating, the anode width is 10cm, and height is 20cm;

[0077] (2) make a cathode with a piece of stainless steel, the width of the cathode is 10cm, and the height is 20cm;

[0078] (3) Feeding intake: lead chloride 1000g, wherein Pb64.3%, Cl 22.4%;

[0079] (4) Electrolyte preparation: take 5L of 2mol / L ammonium sulfate solution, add ammonia water 200ml;

[0080] (5) Reduction: constant voltage mode 2.0v voltage, carry out reduction for 20 hours, use ammonia water to control PH 8-9, after the reduction is completed, leave the tank;

[0081] (6) Reduced lead weighs 656.2g after briquetting, and the result of sampling analysis is Pb98.5%;

[0082] Main technical indicators: initial current 10A, peak current 21.8A, reduction power consumption 336wh, power consumption per ton of lead 523kwh, anode current density 250-545A / m 2 , lead recovery rate 99.8%, ammonia consumption 890ml (containing NH3...

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Abstract

The invention belongs to a wet metallurgy process, and relates to a process for reducing a lead compound as metal lead in ammonium sulfate water solution. Ammonium sulfate water solution is used as electrolyte; the lead compound is used as a raw material; titanium is used as an anode; stainless steel or lead is used as a cathode; a direct-current electric field is applied in an electrolytic cell; the lead compound obtains electrons at the cathode to reduce as the metal lead; ammonia is oxidized as nitrogen for emission at the anode, and meanwhile, H+ ions are generated; sulfates and chlorine ions in the compound enter the solution to generate ammonium sulfate and ammonium chloride with added ammonia water; lead monoxide and lead dioxide in the lead compound are reduced as the metal lead; and meanwhile, H+ ion combination generation water generated by OH+ and the anode is released. The lead compound includes such materials as lead sulfate, lead monoxide, lead dioxide, lead chloride and mixtures thereof as waste lead accumulator paste. The process is different from traditional electrolysis and electrodeposition process; electrolyte contains no lead; and the lead compound is directly reduced as the metal lead at the cathode.

Description

technical field [0001] The invention belongs to hydrometallurgical technology, and in particular relates to a process for preparing lead by electroreduction of ammonium sulfate and ammonia. Background technique [0002] At present, more than 80% of the use of lead is used in lead-acid batteries. With the popularization of automobiles and the development of new energy industries, the amount of lead-acid batteries is increasing, and more and more lead-acid batteries are scrapped. How to be simple and economical Metallurgical researchers and environmental protection workers have conducted a lot of research on the scientific and environmentally friendly treatment of waste batteries, especially in the face of increasingly stringent environmental protection requirements, the hydrometallurgy of lead is imperative. The dismantling technology of waste batteries has developed by leaps and bounds. The crushing and dismantling of batteries have achieved large-scale modern production. Th...

Claims

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Application Information

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IPC IPC(8): C25C1/18C25B1/26C25B1/00
CPCC25B1/00C25B1/26C25C1/18
Inventor 舒毓璋杨龙刘荣祥缪乾帮赵福瑞田喜林
Owner 杨云婷
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