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A method for resource recycling of lead-containing dust removal ash

A recycling, bag filter technology, applied in chemical instruments and methods, improving process efficiency, separating solids from solids with airflow, etc., can solve the problem of reducing treatment cost performance, energy waste, water and pharmaceutical resources waste problems, to achieve the effect of reducing various hazards, simple process and rational utilization of resources

Active Publication Date: 2019-01-08
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the wide variety of lead-containing ash and the large fluctuation range of lead content, not only the fluctuation of the sampling composition at the same location on different days is large, but even the lead content in the gas ash of two blast furnaces in the same steel plant differs by more than 10 times, and the sintered ESP ash is even more Due to the difference in the electric field level, there is a huge difference in the composition
However, the wet magnetic separation process used in the above methods generally achieves the effect of iron extraction and lead removal by mixing and stirring ash, water, and chemicals, but this scheme has certain limitations in industrial production. Disadvantages: In the process of processing low-lead dust removal, due to the low lead content, the above-mentioned process scheme can not only achieve obvious deleading effect, but also cause waste of water and chemical resources, and at the same time increase the processing capacity of stirring, filtering and other equipment , causing waste of energy, increasing processing costs, and reducing cost-effective processing
[0008] At present, among the existing domestic lead-containing dust removal methods, there is no more economical and reasonable method for removing and extracting lead that can adapt to different lead-containing dust removal methods

Method used

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  • A method for resource recycling of lead-containing dust removal ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Take a sample of 100 kg of dust ash (lead dust ash) from the sintering head of a steel plant. First, dry separation is carried out, the blower of the winnowing classification system is turned on, the air pressure in the air pipe is adjusted to 1550 Pa, the magnetic field strength is adjusted to 12000 Oe, and the lead-containing dust ash sample is added to the dry separation system at a feeding rate of 280 kg / h, and collected into the winnowing Iron concentrate, magnetic separation iron concentrate and dry tailings.

[0059] Weigh 800g of dry tail ash and 600g of sodium chloride, add it to 2.8L water, add hydrochloric acid to adjust the pH to 2.5, heat up to 98°C, stir for 100min at a stirrer speed of 200r / min, filter at a constant temperature, and filter out the lead chloride product .

[0060] Weigh and mix according to the mass ratio of lead chloride crystal, sodium chloride, and sodium carbonate 11:15:4, add water according to the mass ratio of solid to liquid 3:5, heat ...

Embodiment 2

[0068] Take a sample of 100 kg of dust ash (lead dust ash) from the sintering head of a steel plant. First, dry separation is carried out, the blower of the winnowing classification system is turned on, the air pressure in the air duct is adjusted to 1400 Pa, the magnetic field strength is adjusted to 10500 Oe, and the lead-containing dust ash sample is added to the dry separation system at a feeding rate of 270 kg / h, and collected into the winnowing Iron concentrate, magnetic separation iron concentrate and dry tailings.

[0069] Weigh 1000g of dry tail ash and 600g of sodium chloride, add it to 2.8L water, add hydrochloric acid to adjust the pH to 2.6, heat up to 95°C, stir for 90min at a stirrer speed of 200r / min, filter at constant temperature, filter out chlorine Lead products.

[0070] Lead chloride crystals, sodium chloride and sodium carbonate are weighed and mixed according to the mass ratio of 12:13:4, and water is added according to the solid-to-liquid mass ratio of 3:4...

Embodiment 3

[0078] Take a sample of 100 kg of dust ash (lead dust ash) from the sintering head of a steel plant. First, dry sorting is carried out, the blower of the winnowing classification system is turned on, the air pressure in the air duct is adjusted to 1250Pa, the magnetic field strength is adjusted to 9000Oe, and the lead-containing dust ash sample is added to the dry sorting system at a feeding speed of 260kg / h, and collected into the winnowing Iron concentrate, magnetic separation iron concentrate and dry tailings.

[0079] Weigh 700g of dry tail ash and 700g of sodium chloride, add it to 2.1L of water, add hydrochloric acid to adjust the pH to 2.7, heat to 91°C, stir with agitator at a speed of 200r / min for 80min, filter at constant temperature, and filter out chlorine Lead products.

[0080] Lead chloride crystals, sodium chloride, and sodium carbonate are weighed and mixed according to the mass ratio of 11:14:4, and water is added according to the solid-liquid mass ratio of 6:7. ...

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Abstract

The invention relates to a resource recycling method of lead-containing precipitator dust. The lead-containing precipitator dust is introduced into an air classification-air and magnet separation system, air-separated iron ore concentrate is obtained by separating large-granularity precipitator dust through air classification, and magnetically separated iron ore concentrate is obtained by separating magnetic materials in fine-granularity precipitator dust through air and magnet separation; the air-separated iron ore concentrate and the magnetically separated iron ore concentrate are returned into the sintering and smelting procedures for use; dry tail ash captured by a bag-type dust collector, sodium chloride and water are mixed, then heated up, stirred and filtered, and lead chloride crystals are obtained; and the lead chloride crystals, sodium chloride, sodium carbonate and water are mixed, then heated up, stirred, filtered and roasted, and lead oxide products are obtained. By meansof the resource recycling method of the lead-containing precipitator dust, the problem that great fluctuation of the lead content in the lead-containing precipitator dust leads to resource wasting, energy wasting, high processing cost, a low cost-performance ratio and the like according to an existing processing technology is avoided, and the hazard of heavy metal lead to a smelting system can bereduced; and the lead oxide products can be produced through the economic and reasonable new technology.

Description

Technical field [0001] The invention relates to the field of comprehensive utilization of wastes, in particular to a method for resource reuse of lead-containing dust ash. Background technique [0002] A large amount of dust and sludge are generated in each process of the iron and steel smelting process. Because the dust and sludge have a certain value for reuse, steel companies generally return to sintering as secondary raw materials. At present, with the continuous increase of solid waste generated by the steel industry, environmental protection issues have become increasingly prominent. Moreover, with the recycling of these solid wastes in sintering, harmful elements continue to be enriched, which has a significant impact on the quality of sintered ore and the process. [0003] At present, many domestic iron and steel enterprises recycle lead-containing dust ash (such as lead-containing dust ash, sintering head dust ash) in the sintering system, resulting in the cyclic enrichme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B13/00B07B9/02
CPCY02P10/20
Inventor 钱峰侯洪宇于淑娟王忠润曲和廷姜成林王丽慧王向锋张洪宇徐永鹏
Owner ANGANG STEEL CO LTD