Low-temperature melting and casting process for lead grid

Abstract

The invention relates to the technical field of secondary lead smelting, and particularly discloses a low-temperature melting and casting process for a lead grid. The low-temperature melting and casting process comprises the following operations that a waste lead-acid storage battery is mechanically broken first and then screened after being recovered to obtain the lead grid; the lead grid is put into a drying kiln to be dried, the water content is controlled to be 5%-15%, flue gas is generated in the drying process, dust and waste gas are obtained after the flue gas is treated through a bag-type dust collector, the dust is regularly returned to a smelting furnace for batching, and the waste gas is discharged after being subjected to desulfurization treatment; the dried lead grid is fed into the smelting furnace, low-temperature melting is carried out under stirring at the temperature of 400-450 DEG C, infusible substances are fished out, and lead liquid and the infusible substances are generated after low-temperature melting; and the lead liquid is subjected to ingot casting, the infusible substances are screened to obtain copper pole columns and metal oxides, the copper pole columns are sold, and the metal oxides are returned to the smelting furnace for burdening. According to the low-temperature melting and casting process for the lead grid, the amount of the waste gas generated by smelting and the discharge amount of lead in the waste gas are remarkably reduced, the recovery cost of secondary lead is remarkably reduced, and the recovery cost of each ton of lead is controlled within 100 yuan.

Description

technical field [0001] The invention relates to the technical field of secondary lead smelting, in particular to a low-temperature melting and casting process for lead grids. Background technique [0002] Refined lead, soft lead and various lead-based alloys can be produced by remelting and resmelting waste batteries after recycling. Regenerated lead occupies an important position in the lead industry, which not only reduces the consumption of primary lead ore resources, but also protects the mineral resources. Reserves, prolonging the mining period of lead mines, are also conducive to environmental protection; more importantly, compared with primary lead, secondary lead has a high recovery rate, low energy consumption and low cost. In the existing technology, most enterprises put high-purity lead grids directly into high-temperature furnaces for high-temperature smelting, and the cost of smelting per ton of lead is nearly a thousand yuan; some companies use lead melting pot...

AI Technical Summary

Problems solved by technology

In the existing technology, most enterprises put high-purity lead grids directly into high-temperature furnaces for high-temperature smelting, and the cost of smelting per ton of lead is nearly a thousand yuan; some companies use lead melting pots for smelting, and the smelting cost of this process depends on the fuel The biggest defect is that the smelting efficiency is low and the slag discharge rate is high, which leads to a large loss of small metals in the waste battery, and the labor intensity of the workers is high and the pollution is large.

In addition, there is also a low-temperature smelting process using a converter. This process uses natural gas and pure oxygen as a heat source, and the flame directly contacts the lead grid, so the oxidation rate of lead is high, the slag rate is 20%-30%, and the slag contains lead. 85%-90%, although it can be produced continuously, but the production efficiency is low, the lead output rate is low, and the smelting cost is also increased virtually

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