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Method for treating blast furnace fume and recycling iron and zinc

A soot and blast furnace technology, applied in the field of comprehensive utilization of resources, can solve the problems of spontaneous combustion of zinc gas ash, reduce the service life of cloth bags, and close symbiosis, and achieve the effects of efficient recovery, convenient operation, and comprehensive utilization of resources

Inactive Publication Date: 2014-09-10
孙伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) Zinc has a destructive effect on the lining of the blast furnace
[0007] (2) Zinc will block the blast furnace riser and gas pipeline due to enrichment
[0008] (3) Zinc can cause gas ash to spontaneously ignite
Spontaneous combustion is due to the heat generated by zinc oxide igniting the carbon powder, which not only affects the transportation, but also may burn out the bag for maintenance, reduce the service life of the bag, and burn the maintenance personnel in the box
[0009] (4) When the blast furnace dust is added to the sintering mixture, the content of harmful impurities is getting higher and higher, which leads to a decrease in the utilization factor of the blast furnace, an increase in the coke ratio, and a decrease in the service life of the hard blast furnace.
[0010] (5) The blast furnace dust is sticky, the bag is easy to frost, and it is difficult to unload the ash
[0020] Since blast furnace dust has the characteristics of complex composition, fine particle size, small density, high ash content, complex mineral structure, and close symbiotic relationship, the recovery rate of elements such as iron, zinc and indium from blast furnace dust is low, resulting in waste of valuable metal resources. Therefore, developing a new technology based on the physical and chemical properties of blast furnace dust to realize the recovery of valuable elements such as iron and zinc is of great significance for the resource utilization of blast furnace dust.

Method used

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  • Method for treating blast furnace fume and recycling iron and zinc
  • Method for treating blast furnace fume and recycling iron and zinc
  • Method for treating blast furnace fume and recycling iron and zinc

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The blast furnace dust containing 22.78% iron, 9.95% zinc and 23.37% carbon is treated by the above method. Take 500g of blast furnace dust and adjust the slurry according to the solid-liquid weight ratio of 1:5, heat to 50°C, stir at a stirring speed of 800r / min for 30 minutes, so that the electrolyte in the blast furnace dust is completely dissolved, filter, the clear liquid is an electrolyte solution, and the filter residue It is iron-containing slag, and the slag is mixed with water until the pulp dispersion concentration is 20%, the stirring speed is 800r / min, and the 80KHz ultrasonic wave is used to disperse, and the dispersant sodium carbonate and sodium hexametaphosphate 600g / t each, 800g / t to obtain dispersed pulp; transfer the dispersed pulp to the flotation tank, use diesel oil 100g / t as collector and terpineol 50g / t as foaming agent to float and remove charcoal in blast furnace dust to obtain carbon fines ore and dispersed ore after decarbonization; take -40...

Embodiment 2

[0044] The blast furnace dust containing 23.96% iron, 10.98% zinc and 19.86% carbon is treated by the above method. Take 500g of blast furnace dust and mix it according to the solid-liquid weight ratio of 1:6, heat it to 60°C, stir at a stirring speed of 900r / min for 30 minutes, so that the electrolyte in the blast furnace dust is completely dissolved, filter, the clear liquid is an electrolyte solution, and the filter residue It is iron-containing slag, the slag is mixed with water to adjust the slurry to a concentration of 30%, the stirring speed is 800r / min, and the 80KHz ultrasonic wave is used for dispersion, and the dispersant sodium carbonate and sodium hexametaphosphate are added at 800g / t and 800g / t respectively. Promptly get the dispersed pulp; transfer the dispersed pulp to the flotation cell, use 100g / t of diesel oil as the collector, and 50g / t of terpineol as the foaming agent to remove the charcoal in the blast furnace dust by flotation to obtain the charcoal conc...

Embodiment 3

[0048] The blast furnace dust containing 24.93% iron, 10.17% zinc and 20.50% carbon is treated by the above method. Take 500g of blast furnace dust and mix it according to the solid-liquid ratio of 1:5.5, heat to 55°C, stir at 900r / min for 30 minutes, stir for 30 minutes, so that the electrolyte in the blast furnace dust is completely dissolved, filter, and the clear liquid is an electrolyte solution , the filter residue is iron-containing slag, the slag is mixed with water to a concentration of 25%, and the stirring speed is 900r / min under the stirring condition, stirring, dispersing with 80KHz ultrasonic waves, and adding 800g / t of dispersants sodium carbonate and sodium hexametaphosphate , 800g / t to get the dispersed pulp; transfer the dispersed pulp to the flotation tank, use 100g / t of diesel oil as the collector, and 50g / t of terpineol as the foaming agent to remove the charcoal in the blast furnace dust by flotation Dispersed pulp after carbon eluting; take -400 mesh mag...

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Abstract

The invention relates to the field of comprehensive resource utilization, and in particular to a method for treating blast furnace fume and recycling iron and zinc. The method comprises the following steps: (a) mixing blast furnace fume with water, pulping, dissolving the electrolyte in the blast furnace fume, subsequently filtering to obtain filtrate, adding water into the filtrate to pulp, and performing ultrasonic dispersion to obtain dispersed ore pulp; (b) performing flotation separation on the dispersed ore pulp to desorb carbon in the blast furnace fume; (c) magnetizing magnetite powder, adding the magnetite powder into the dispersed ore pulp after the floatation separation decarburization, adding a selective flocculant for selective magnetization and flocculation so as to selectively agglomerate hematite and magnetite in the blast furnace fume, and performing magnetic separation to obtain iron ore concentrate and magnetic tailings; (d) adding a selective inhibitor into the magnetic tailings to inhibit iron-bearing minerals, performing surface modification on the zinc oxide minerals, and subsequently performing selective flotation separation to obtain zinc concentrate. The method for treating blast furnace fume and recycling iron and zinc is convenient to operate and is capable of efficiently recycling valuable elements such as iron and zinc, and comprehensive resource utilization of blast furnace dust is achieved.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of resources, in particular to a method for processing blast furnace dust and recovering iron and zinc. Background technique [0002] Blast furnace dust is one of the main solid wastes in the sintering and ironmaking links of iron and steel enterprises. Because the content of alkali metals such as potassium and sodium in sintering ESP ash is relatively high, and the content of zinc in ironmaking bag gas ash is relatively high, if the electricity is directly collected If dedusting ash and gas ash are reused in sintering mixture, the cyclic enrichment of potassium, sodium, zinc and other elements will have a negative impact on the operation of the blast furnace. Blast furnace dust contains iron, carbon and a small amount of non-ferrous metals, which are valuable secondary resources. If they cannot be effectively treated and utilized, it will not only cause waste of resources, but also cause ...

Claims

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Application Information

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IPC IPC(8): B03D1/00B03D3/06
Inventor 孙伟韩海生唐鸿鹄刘文莉
Owner 孙伟
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