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A clean smelting method for lead-containing waste slag

A waste slag and clean technology, which is applied in the field of heavy metal pollution control, can solve the problems of reducing the grade of mixture, increasing production costs, and low heat utilization efficiency, and achieves the effects of reducing dust, reducing furnace knots, and reducing pyrolysis pulverization

Inactive Publication Date: 2018-03-06
云南业胜环境资源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not require sintering, but the added curing agent, sulfur fixing agent, binder, hardener, etc. will reduce the grade of the mixture, thereby increasing production costs, reducing product output, resulting in low heat utilization efficiency and high production energy consumption.

Method used

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  • A clean smelting method for lead-containing waste slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Raw materials: 337.4 tons of lead sulfate slag, 39.47 tons of calcium oxide; 90.26 tons of iron powder recovered by magnetic separation of rotary kiln slag after mixing and stacking for 24 hours; , 6.26%; Fe, 16.25%; SiO2, 11.23%; Ca, 6.57%; Ag, 467.13 tons of charge of 135.8 g / t. Pressed shaped bricks, after 4 days of hardening, the molded bricks were added to the blast furnace in batches for continuous smelting for 7 days, and the cumulative output of crude lead was 77.7 tons, containing 96.2% of Pb, containing 742g / t of Ag, and the lead yield was 87.15%; 10.78 tons of soot, containing Pb63.86%, lead recovery rate 95.18%; water-quenched slag 185.83 tons, containing Pb, 0.86%; iron matte 73.22 tons. The flue gas is sprayed and absorbed by the zinc oxide emulsion and discharged up to the standard.

Embodiment 2

[0051] Raw materials: 1,024.9 tons of lead-containing acid mud, 124.02 tons of calcium oxide; 283.22 tons of iron powder recovered by magnetic separation of rotary kiln slag after mixing; the main components are: Pb, 21.46%; S, 4.37%; Fe, 16.35%; SiO2, 11.64%; Ca, 6.63%; Ag, 1432.14 tons of charge of 217 g / ton. Pressed molded bricks, molded bricks were hardened for 3 days and added to the blast furnace in batches for continuous smelting for 22 days. The cumulative output of crude lead was 280.08 tons, containing 95.72% of Pb, containing 1032g / t of Ag, and the yield of lead was 87.23%; 40.26 tons of soot, containing Pb64.12%, lead recovery rate 95.63%; water quenching slag 711.58 tons, containing Pb, 0.79%; iron matte 154.63 tons. The flue gas is sprayed and absorbed by the zinc oxide emulsion and discharged up to the standard.

Embodiment 3

[0053] Raw materials: 146.09 tons of battery acid paste, lead-containing waste glass powder, 56.6 tons; calcium oxide, 24.55 tons; after mixing, add 56.1 tons of iron powder recovered by magnetic separation of rotary kiln slag; the main component of the preparation is: Pb, 37.21% ; S, 8.39%, Fe, 16.18%, SiO2, 12.25%, Ca, 283.34 tons of charge of 6.77%. Pressed shaped bricks, after hardening for 5 days, the molded bricks were added to the blast furnace in batches for continuous smelting for 4 days, the cumulative output of crude lead was 93.71 tons, containing Pb97.6%, and the lead yield was 86.75%; soot was 14.62 tons, containing Pb65.13%, Lead recovery rate is 95.78%; water-quenched slag is 99.69 tons, containing Pb, 0.94%; iron matte is 57.32 tons. The flue gas is sprayed and absorbed by the zinc oxide emulsion and discharged up to the standard.

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Abstract

A clean melting method for lead-containing waste slag is disclosed. The method includes 1) curing and converting, 2) curing and hardening and 3) melting. The method includes firstly mixing the lead-containing waste slag with calcium oxide, curing, converting, fully mixing with iron powder, shaping, making a brick, curing and hardening the brick, then sending the brick into a blast furnace, and performing reduction melting to recover lead and iron-sulfur, thus achieving clean melting. The method significantly improves compactness, strength and temperature resistance of the shaped brick, reduces thermo-collapse and pyrolysis powdering of the shaped brick in a melting process, reduces furnace accretion and dust, and increases the direct recovery rate of lead melting in the blast furnace and the hearth melting period. The method is simple in operation, low in adding amounts of sulfur fixing agents, adhesives, and the like, environmental friendly, high in metal recovery rate and heat utilization efficiency, low in impurity content, low in production energy consumption, and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of heavy metal pollution control, and in particular relates to a clean smelting method for lead-containing waste slag. Background technique [0002] Lead-containing waste residues are mainly produced in various industries such as non-ferrous metal smelting, iron and steel enterprises, chemicals, batteries, etc. Among them, the lead-containing waste residues containing lead sulfate are the majority, mainly including lead sulfate residue, lead-containing acid mud, acid paste of waste batteries, etc. For a long time, the lead in the lead-containing waste slag is very easy to cause pollution to groundwater and soil. If it is not disposed of in time, it will not only pollute the environment, but also cause a huge waste of resources. Most of the current disposal methods use sintering desulfurization smelting process to process these lead wastes. The mixture obtained by uniformly mixing lead wastes with iron-containing mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B13/02C22B1/00
CPCC22B1/005C22B7/001C22B7/04C22B13/025Y02P10/20
Inventor 方喜张瑞龙
Owner 云南业胜环境资源科技有限公司
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