Desulphurization method for lead plaster of waste lead-acid storage battery

A technology of waste lead-acid batteries and lead paste, which is applied in the field of desulfurization, can solve the problems of high crystallization cost of by-product solutions and low desulfurization efficiency of lead paste, and achieve the effects of wide product use, reduced crystallization evaporation cost, and low crystallization cost

Inactive Publication Date: 2017-11-24
HUBEI CHUKAI METALLURGY
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Problems solved by technology

[0007] In view of this, the embodiment of the present invention provides a desulfurization method for lead paste of waste lead-acid batteries, the main purpose of which is to solve the problems of low desulfurization efficiency of lead paste and high cost of by-product solution crystallization

Method used

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Embodiment

[0026] One-time desulfurization: first crush 20 tons of waste lead-acid batteries, obtain lead paste after crushing, sorting, and pressure filtration, and put about 11 tons of lead paste after pressure filtration into a desulfurization tank with 11-12 tons of water. Stir continuously at room temperature, add 3.8 tons of ammonium carbonate to the above-mentioned desulfurization tank in batches, and complete the dosing within 2 hours to form the first mixed solution; while stirring, circulate the first mixed solution from the pump through the forced desulfurizer to the desulfurization tank After 45 minutes of desulfurization reaction, add the remaining amount of ammonium carbonate to the desulfurization tank again. During the dosing process, only stirring is carried out, and the forced desulfurization of the internal circulation is stopped; Finally, the second mixed liquid is obtained; the second mixed liquid is separated from the solid and liquid through the filter press, and th...

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Abstract

The invention discloses a desulphurization method for lead plaster of a waste lead-acid storage battery, and relates to the technical field of desulphurization. The method disclosed by the invention comprises the steps of: carrying out wet desulphurization on the lead plaster by using ammonium carbonate as a desulphurization agent; cycling and stirring a mixture of the lead plaster, water for diluting the lead plaster and the ammonium carbonate between a desulphurization tank and a forced desulphuriser; feeding the desulphurized lead plaster into a smelting system; reusing desulphurization liquid as liquid for diluting the lead plaster; and enabling the reused secondary desulphurization liquid to enter an evaporative crystallization system and outputting ammonium sulfate. According to the method disclosed by the invention, after the desulphurization liquid is reused, salt concentration of the desulphurization liquid is improved, and thus, cost of enabling the desulphurization liquid to enter the evaporative crystallization system is reduced; according to the invention, the ammonium carbonate is used as the desulphurization agent, so that the produced ammonium sulfate has use value; and according to the invention, in the desulphurizing process, the forced desulphuriser which is of a special structure is used, and newly generated lead carbonate particles coating the surface of lead sulphate can be ground and removed, so that the desulphurizing process is guaranteed to be successfully carried out, desulphurizing efficiency is improved, and environment pollution is reduced.

Description

technical field [0001] The invention relates to the technical field of desulfurization, in particular to a method for desulfurizing lead paste of waste lead-acid batteries. Background technique [0002] Lead is one of the metals commonly used by humans. At present, lead is mainly used in lead-acid batteries. According to incomplete statistics, about 80% of the lead consumed in the world is used in lead-acid batteries. With the development of the communication and transportation industry, the demand for lead batteries will continue to grow in the near future. However, according to the current reserve-production ratio of lead mines, lead resources are increasingly depleted, and the service life of lead-acid batteries is only 2-4 years. , a huge amount of waste is scrapped every year. Waste lead-acid batteries contain chemical components such as lead, antimony, tin and sulfuric acid. If they are not treated and recycled, it will not only cause serious pollution to the ecologica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C22B7/00C22B13/00
CPCC22B7/00C22B13/00H01M10/54Y02P10/20Y02W30/84
Inventor 余玉林廖从银范昌贵梅立寿陈黎阳
Owner HUBEI CHUKAI METALLURGY
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