Synergistic recycling method of zinc-rich metallurgical dust sludge and semidry desulfurization ash

A semi-dry desulfurization, metallurgical dust sludge technology, applied in chemical instruments and methods, alkali metal chlorides, zinc oxide/zinc hydroxide, etc., to achieve the effect of high free alkali content and complex components

Pending Publication Date: 2020-06-19
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen that the above-mentioned methods all involve the co-processing technology of blast furnace gas ash and desulfurized gypsum / desulfurized ash, but have not been able to realize the treatment of unstable components in desulfurized ash such as quicklime and calcium sulfite, and iron, zinc, carbon, etc. in blast furnace gas ash. Synergistic Comprehensive Utilization of Valuable Components

Method used

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  • Synergistic recycling method of zinc-rich metallurgical dust sludge and semidry desulfurization ash
  • Synergistic recycling method of zinc-rich metallurgical dust sludge and semidry desulfurization ash

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] The main components of semi-dry desulfurization ash and blast furnace gas ash from a steel plant in Shandong (the range listed in the example is the range of multiple tests, the same below) are: blast furnace gas ash TFe 26.53% ~ 26.65%, SiO 2 5.51%~5.89%, ZnO 4.45%~4.84%, Al 2 o 3 2.91%~3.22%, CaO 3.07%~3.93%, MgO 0.06%~0.16%; semi-dry desulfurization ash TFe 5.56%~5.61%, SiO 2 10.59%~11.20%, Al 2 o 3 0.81%-1.19%, CaO 32.21%-39.96%, MgO 0.35%-1.09%.

[0020] Use process:

[0021] (1) Mix the ingredients. Take 1kg of blast furnace gas ash, mix it with semi-dry desulfurization ash according to the mass ratio of 1:0.35~0.5, make pellets, and after drying, oxidize and sinter at 1250℃~1260℃ to collect smoke and dust to produce sinter.

[0022] (2) Recovery of zinc oxide. The soot is treated by gravity separation, and the ZnO grade of the product is 96.25% to 96.63%.

[0023] (3) extract potassium chloride. Gravity separation water is recycled to enrich soluble ...

example 2

[0028] Semi-dry desulfurization ash and blast furnace gas ash from a steel plant in Inner Mongolia. The main components are: blast furnace gas ash TFe 26.11%-28.35%, ZnO 4.22%-4.67%, SiO 2 4.53%~5.12%, Al 2 o 3 2.22%~2.26%, CaO3.66%~3.75%, MgO 0.38%~0.65%; semi-dry desulfurization ash TFe 3.55%~4.21%, SiO 2 11.22%~11.37%, Al 2 o 3 0.71%-1.37%, CaO 35.42%-38.59%, MgO 0.22%-1.17%.

[0029] Use process:

[0030] (1) Mix the ingredients. Take 1kg of blast furnace gas ash, mix it with semi-dry desulfurization ash according to the mass ratio of 1:0.36~0.55, make pellets, and after drying, oxidize and sinter at 1280℃~1300℃ to produce sintered ore.

[0031] (2) Recovery of zinc oxide. The soot is treated by gravity separation, and the ZnO grade of the product is 94.53% to 96.16%.

[0032] (3) Selective crushing. After the sinter is cooled, use roller crushing equipment to crush the sinter to 0.55mm-0.6mm, and selectively dissociate calcium ferrite and gypsum.

[0033] (4...

example 3

[0037] Semi-dry desulfurization ash and blast furnace gas ash from a steel plant in Guangxi, the main components are: blast furnace gas ash TFe 28.53%-26.65%, SiO 2 5.51%~5.89%, ZnO 6.81%~8.26%, Al 2 o 3 2.91%~3.22%, CaO 3.07%~3.93%, MgO 0.06%~0.16%; semi-dry desulfurization ash TFe 5.53%~6.07%, SiO 2 10.73%~10.81%, Al 2 o 3 0.97%-1.49%, CaO 36.42%-39.01%, MgO 0.39%-0.79%.

[0038] Use process:

[0039] (1) Mix the ingredients. 5kg of blast furnace gas ash is mixed with semi-dry desulfurization ash at a mass ratio of 1:0.56-0.68 to make pellets. After drying, it is oxidized and sintered at 1230°C-1260°C to collect smoke and dust to produce sintered ore.

[0040] (2) Recovery of zinc oxide. The soot is treated by gravity separation, and the ZnO grade of the product is 98.12% to 98.46%.

[0041] (2) Selective crushing. After the sinter is cooled, use roller crushing equipment to crush the sinter to 3.5mm-3.8mm, and selectively dissociate calcium ferrite and gypsum. ...

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Abstract

The invention discloses a synergistic recycling method of zinc-rich metallurgical dust sludge and semidry desulfurization ash, and belongs to the field of resource regeneration. The method comprises the following steps: firstly, mixing zinc-rich metallurgical dust sludge and semi-dry desulfurization ash according to a mass ratio of 1: (0.02-1.99), pelletizing, drying, then mixing, oxidizing and sintering according to a mass ratio of small balls to pulverized coal (coke powder) of 1: (0.03-0.89), and enriching sphalerite and an alkali metal chloride salt in the smoke dust, performing reselection and purification to obtain a zinc oxide product, recycling reselected water, circularly enriching a soluble salt, merging into a wet process, producing sodium chloride and potassium chloride by processes such as a cold crystallization direct flotation method and the like, cooling sintered ore obtained by sintering, crushing and finely grinding the sintered ore to 0.028-13.9 mm by using roller type crushing equipment and rod grinding equipment, selectively dissociating calcium ferrite and gypsum, then carrying out magnetic separation to separate calcium ferrite, taking the magnetic separationtailings for producing a cementing material to replace cement, or separating low-density gypsum from the magnetic separation tailings by using a micro-pulse elutriation jigger, filtering the tailings, using the filter residues as a concrete admixture, recycling the filtrate, enriching a soluble salt, and merging the filtrate into the wet process to produce sodium chloride and potassium chloride.

Description

technical field [0001] The invention belongs to the field of renewable resources and relates to a method for synergistic resource utilization of zinc-rich metallurgical dust and semi-dry desulfurization ash. Background technique [0002] Zinc-rich metallurgical dust includes blast furnace gas ash, sintering machine and converter dust, etc. It is a strong alkaline and high-heavy metal solid waste discharged from the metallurgical industry, and it is difficult to be disposed of alone or recycled. However, it contains a variety of valuable components and has potential comprehensive utilization value. The content of active alkali in semi-dry desulfurization ash is high and its stability is poor, so the value of recycling alone is not high. At the same time, the production process of calcium ferrite is complicated, and it has many applications in the steel, chemical and electronic industries. High-quality zinc oxide is also a scarce resource in my country and has a wide range of...

Claims

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Application Information

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IPC IPC(8): C01G9/03C01D3/04C01G49/00C01F11/46C04B7/26C04B7/24C04B18/14C04B18/08B03C1/30
CPCB03C1/30C01D3/04C01F11/468C01G9/03C01G49/00C01P2006/80C04B7/24C04B7/26C04B18/062Y02W30/91Y02P40/10
Inventor 胡文韬汪东芳郭九传刘欣伟
Owner UNIV OF SCI & TECH BEIJING
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