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A method for treating waste lead paste by top-side smelting

A technology for waste lead paste and furnace roof, which is applied in the field of metallurgy, can solve the problems of complex process method, low vertical yield and high processing cost, and achieves the effects of compact process flow, improved vertical yield and large processing capacity.

Active Publication Date: 2018-09-04
YUNNAN CHIHONG ZINC & GERMANIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the recycling and use of waste lead paste for waste lead-acid batteries, fire method and wet method are generally used at present, as well as solid-phase electrolytic reduction, directly find out the appropriate addition ratio to make lead paste, use waste lead paste to synthesize tetrabasic lead sulfate, Production of ultrafine PbO powder from waste lead paste, citrate-roasting method, chemical product synthesis method, most of the existing processing methods are complicated, with small processing capacity, high processing cost and low lead yield
Moreover, the content of antimony in the current waste lead paste is relatively high. If it is not recycled, it will not only cause environmental pollution, but also a serious waste of resources and loss of enterprises; top-blown furnaces and reduction furnaces are common equipment in metallurgy

Method used

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  • A method for treating waste lead paste by top-side smelting

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Experimental program
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Effect test

Embodiment 1

[0037]1) Mix waste lead plaster, iron powder, and limestone according to the weight ratio of 100:8:5, and granulate them into pellets with a particle size of 8mm and a water content of 6% through cylinder granulation; iron powder is added to improve the slag shape, Limestone is used as a slagging agent. The main components of the waste lead plaster are 60% lead, 5% antimony, and 8% sulfur. The iron powder contains 99% Fe, and the limestone contains CaCO 3 82%;

[0038] 2) Send the pellets obtained in step (1) continuously and evenly to the top-blowing furnace with a belt conveyor, the amount of pellets added is 20t / h, and then spray pulverized coal and oxygen-enriched air from the top-blowing furnace top spray gun In, the furnace top spray gun is a liftable furnace top spray gun installed vertically on the furnace roof, the pulverized coal addition is 15% of the pellet addition, and the pulverized coal particle size is -200 mesh 90%, which contains 70% carbon, 0.1% sulfur, 15...

Embodiment 2

[0043] 1) Mix waste lead plaster, iron powder, and limestone according to the weight ratio of 100:5:3, and granulate them into pellets with a particle size of 5mm and a water content of 4.5% through cylinder granulation; iron powder is added to improve the slag shape, Limestone is used as a slagging agent. The main components of the waste lead plaster are 75% lead, 3% antimony, and 5% sulfur. The iron powder contains 98.5% Fe, and the limestone contains CaCO 3 81%;

[0044] 2) Send the pellets obtained in step (1) continuously and evenly to the top-blowing furnace with a belt conveyor, the amount of pellets added is 30t / h, and then spray pulverized coal and oxygen-enriched air together from the top-blowing furnace top-blowing furnace In, the furnace top spray gun is a liftable furnace top spray gun arranged perpendicular to the furnace roof, the pulverized coal addition is 9% of the pellet addition, and the pulverized coal particle size is about 85% of -200 mesh, wherein Carb...

Embodiment 3

[0049] 1) Mix waste lead plaster, iron powder, and limestone according to the weight ratio of 100:2:1, and granulate them into pellets with a particle size of 2mm and a water content of 3% through cylinder granulation; iron powder is added to improve the slag shape, Limestone is used as a slagging agent. The main components of the waste lead plaster are 90% lead, 1% antimony, and 2% sulfur. The iron powder contains 98% Fe, and the limestone contains CaCO 3 80%;

[0050] 2) Send the pellets obtained in step (1) continuously and evenly to the top-blowing furnace with a belt conveyor, the amount of pellets added is 40t / h, and then spray pulverized coal and oxygen-enriched air together from the top-blowing furnace top-blowing furnace In, the furnace top spray gun is a liftable furnace top spray gun arranged perpendicular to the furnace roof, the pulverized coal addition is 3% of the pellet addition, and the pulverized coal particle size is -200 mesh 80%, which contains 50% carbon...

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Abstract

The invention discloses a method for treating waste lead plaster through top side smelting. The method comprises the steps that the waste lead plaster, iron powder and lime are pelletized, an oxidizing reaction is made in a top-blowing furnace, and then a reduction reaction is carried out in a reduction furnace to obtain lead bullion and waste residues. The oxidizing reaction and the reduction reaction are completed through the two furnaces, the technological process is compact, the treatment amount is large, high SO2 smoke and low SO2 smoke are treated in a split manner, and therefore SO2 recovery and treatment are facilitated. According to the method, a top-blowing furnace top spraying gun is adopted for spraying in pulverized coal and oxygen-enriched air, the cost is low, in-furnace reacting is easily controlled, and reacting is sufficient. By means of the technological method, the lead content in slag is lower than 2% and is far lower than the average lead content in slag in the existing smelting technology, and the average lead content in slag is higher than 3.5%, the direct lead yield can be effectively improved, and the waste slag lead content and the treatment cost are reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for top-side smelting and processing waste lead paste. Background technique [0002] With the increasing consumption of lead-acid batteries, how to cleanly recycle waste lead-acid batteries has attracted widespread attention from all walks of life, and the focus of recycling is on the clean and efficient recycling of waste lead paste, so large-scale, intensive and environmentally friendly Clean recycling technology has become a new demand for lead recycling companies in the new era. For the recycling and use of waste lead paste for waste lead-acid batteries, fire method and wet method are generally used at present, as well as solid-phase electrolytic reduction, directly find out the appropriate addition ratio to make lead paste, use waste lead paste to synthesize tetrabasic lead sulfate, Waste lead paste is used to produce ultra-fine PbO powder, citrate-r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B13/02
CPCC22B13/025Y02P10/20
Inventor 贾著红马雁鸿吴红林李衍林代龙果杨光灿杨伟应希源甫耀富卢叶罗凌艳王瑞山杨树泉
Owner YUNNAN CHIHONG ZINC & GERMANIUM
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