A method for reusing lead sludge produced by smear leaching acid

Abstract

The invention discloses a recycling method of lead slime produced by acid leaching and rolling of a smear. The recycling method sequentially comprises the following steps: (1) fishing out the lead slime which is precipitated for 1-3 hours from a precipitation tank of a smear machine; (2) placing the fished lead slime into a grinding mixer for mixing for 30-60 minutes and then taking out the lead slime; (3) adding pure water to the mixed lead slime until the apparent density is 2.0-3.0g / cm<3> to prepare pasty lead slime; (4) weighing the pasty lead slime which is 2.5%-4.5% of formula amount of positive lead paste for later use; and (5) adding weighed pasty lead slime to a paste mixing machine within 3-5 minutes after beginning of wet mixing in the paste mixing technology to prepare the positive lead paste. Crushing after drying is not needed, so that secondary pollution of dust is not caused; environmental protection equipment does not need to input when energy consumption is reduced; the lead slime is directly adjusted for use; the fed materials are fully utilized; waste is reduced; the input-output ratio is improved; and the production cost is directly reduced.

Description

technical field [0001] The patent of the invention relates to the field of lead-acid storage battery manufacturing, in particular to a method for reusing lead sludge produced by smear leaching acid. Background technique [0002] Smear rolling is an indispensable link in the production process of lead-acid power battery raw plates. Smear rolling is carried out on a smear machine. Generally, acid is poured on the rolling rollers during rolling. way, ie pouring the rolling acid. The rolling acid can make the surface of the green plate smooth, and also form a lead sulfate layer on the surface of the green plate, which can prevent the lead paste from adhering to the rolling roller during the rolling process, and the surface of the green plate loses water too quickly when it is dry. Cracks on the surface of the plates can also prevent the lead paste between the green plates from sticking to the hanger when the green plates are received on the hanger, and ensure that the water in ...

AI Technical Summary

Problems solved by technology

[0003] During the process of leaching acid, the rich acid solution washes the surface of the green plate, and part of the lead paste on the surface of the green plate will enter the sedimentation tank with the washing of the acid solution. The lead paste is deposited at the bottom of the sedimentation tank, and it is dried after being taken out. After drying, the agglomerated lead mud is ground and screened, and an appropriate amount can be added and reused when mixing the paste. This method of lead paste recovery requires long-term drying , which increases the cost of equipment and energy consumption. The dried lead block will produce dust during grinding and cause secondary pollution. While increasing the subsequent environmental protection treatment costs, it also requires labor and equipment, because the lead sludge is in dilute sulfuric acid. If the soaking time is too long, the content of lead sulfate in dry lead mud will be as high as 52~65%, and the amount of addition should not be too much, and the recycling rate will be low

There is also the method of directly adding the dried and pulverized lead slime to the paste machine and the paste for reuse. This method cannot be quantitatively produced due to precipitation agglomeration and unstable dilute acid content. The difference in open circuit voltage after the battery is formed affects the Plate life

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