Method for preparing ZnO from blast furnace gas ash through microwave roasting pretreatment and ammonia leaching

A blast furnace gas ash and microwave roasting technology, which is applied in the field of hydrometallurgy, can solve the problems of high content of zinc-containing slag dust, alkaline gangue, low resource utilization rate of zinc-containing gas ash, environmental pollution, etc., so as to shorten the amount of leaching agent , the effect of saving energy consumption and reducing the burden on enterprises

Active Publication Date: 2016-05-04
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0007] The present invention aims at iron and steel metallurgy zinc-containing dust, adopts the existing acid leaching treatment technology and process to treat zinc-containing slag dust with high alkaline gangue content, low-grade zinc-containing gas ash resource utilization rate is low; adopts a volatilization enrichment method to extract zinc oxide Recycling metal zinc in the form of recycling has the problems of high energy consumption and serious environmental pollution.

Method used

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  • Method for preparing ZnO from blast furnace gas ash through microwave roasting pretreatment and ammonia leaching

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Experimental program
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Effect test

Embodiment 1

[0030] Such as figure 1 Shown, the microwave roasting pretreatment-ammonia method leaching blast furnace gas ash prepares the method for ZnO, and its specific steps are as follows:

[0031] (1) Microwave roasting pretreatment: first add to blast furnace gas ash (the total zinc content in the zinc-containing minerals in the blast furnace gas ash is 25wt%, the ZnO content in the total zinc is 13wt%, ZnSiO 4 6wt%, ZnFe 2 o 4 5wt%, and other zinc-containing minerals accounted for 1wt%), adding 5% of the mass of blast furnace gas ash Na 2 CO 3 After mixing evenly, the mixed material is obtained, and the mixed material is microwave roasted at 200°C for 2 hours to obtain calcined sand; the purpose of roasting pretreatment is to realize the refractory mineral phase (ZnFe 2 o 4 and Zn 2 SiO 4 ) to the ZnO phase, the following reactions mainly occur:

[0032] ZnFe 2 o 4 +Na 2 CO 3 =ZnO+Na 2 Fe 2 o 4 +CO 2

[0033] ZnSi 2 o 4 +Na 2 CO 3 =2ZnO+Na 2 Si 2 o 4 +CO 2 ...

Embodiment 2

[0042] Such as figure 1 Shown, the microwave roasting pretreatment-ammonia method leaching blast furnace gas ash prepares the method for ZnO, and its specific steps are as follows:

[0043] (1) Microwave roasting pretreatment: first add to blast furnace gas ash (total zinc content in blast furnace gas ash is 4wt%, ZnO content in total zinc is 2wt%, ZnSiO 4 1wt%, ZnFe 2 o 4 0.7wt%, other zinc-containing minerals 0.3wt) add 10% of the mass of blast furnace gas ash Na 2 CO 3 After mixing evenly, the mixed material is obtained, and the mixed material is microwave roasted at 400°C for 1 hour to obtain calcined sand; the purpose of roasting pretreatment is to realize the refractory mineral phase (ZnFe 2 o 4 and Zn 2 SiO 4 ) to the ZnO phase, the following reactions mainly occur:

[0044] ZnFe 2 o 4 +Na 2 CO 3 =ZnO+Na 2 Fe 2 o 4 +CO 2

[0045] ZnSi 2 o 4 +Na 2 CO 3 =2ZnO+Na 2 Si 2 o 4 +CO 2 ;

[0046] (2) Leaching: use ammonia water (NH 3 ·H 2 O)-NH 4 HCO...

Embodiment 3

[0054] Such as figure 1 Shown, the microwave roasting pretreatment-ammonia method leaching blast furnace gas ash prepares the method for ZnO, and its specific steps are as follows:

[0055] (1) Microwave roasting pretreatment: first, the blast furnace gas ash (total zinc content in blast furnace gas ash is 15wt%, ZnO content in total zinc is 7.73wt%, ZnSiO 4 3.94wt%, ZnFe 2 o 4 2.63wt%, other zinc-containing minerals accounted for 0.7wt%), adding 20% ​​of the mass of blast furnace gas ash Na 2 CO 3 After mixing evenly to obtain the mixed material, the mixed material was microwave roasted at 600°C for 0.5h to obtain calcined sand; the purpose of roasting pretreatment is to realize the refractory mineral phase (ZnFe 2 o 4 and Zn 2 SiO 4 ) to the ZnO phase, the following reactions mainly occur:

[0056]ZnFe 2 o 4 +Na 2 CO 3 =ZnO+Na 2 Fe 2 o 4 +CO 2

[0057] ZnSi 2 o 4 +Na 2 CO 3 =2ZnO+Na 2 Si 2 o 4 +CO 2 ;

[0058] (2) Leaching: use ammonia water (NH 3 ...

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Abstract

The invention relates to a method for preparing ZnO from blast furnace gas ash through microwave roasting pretreatment and ammonia leaching, and belongs to the technical field of hydrometallurgy. The method comprises the steps that 1, microwave roasting pretreatment is conducted, specifically, Na2CO3 with the blast furnace gas ash mass being 5-20% is added into the blast furnace gas ash to be uniformly mixed, a mixed material is obtained, microwave roasting is conducted on the mixed material for 0.5-2 h at the temperature of 200 DEG C-600 DEG C, and a roasted product is obtained; 2, mixing and leaching are conducted on the roasted product through ammonia water with the total ammonia concentration being 3-6 mol / L and a NH4HCO3 solution for 0.5-1.0 h at the temperature of 25 DEG C-45 DEG C, then solid-liquid separating is conducted, washing treatment is conducted on solid slag through a 5% ammonia water solution for many times, and leaching liquid and leaching residues are obtained; and 3, the ZnO is prepared after purifying and impurity removing, ammonia distillation and crystallization and microwave calcining are conducted. According to the method for preparing the ZnO from the blast furnace gas ash through microwave roasting pretreatment and ammonia leaching, ferrous metallurgy smoke dust containing zinc can be cleanly and efficiently utilized, the recovery utilization rate of secondary resources is increased, and meanwhile a high-quality ZnO product is prepared with low energy consumption.

Description

technical field [0001] The invention relates to a method for preparing ZnO by microwave roasting pretreatment-ammonia leaching blast furnace gas ash, and belongs to the technical field of hydrometallurgy. Background technique [0002] In addition to zinc mineral resources, zinc-containing metallurgical slag dust is also an extremely important available resource in my country, mainly zinc-containing gas mud and gas ash produced in the blast furnace smelting process, zinc-containing smoke dust produced in the electric arc furnace smelting process, and lead smelting slag volatilized Zinc-containing fumes and zinc hydrometallurgy slag. my country is the world's largest steel producer, with an annual output of more than 500 million tons of steel. According to statistics, every ton of steel produced produces 10-15kg of zinc-containing blast furnace gas mud, and the annual output of gas ash is about 5-7 million tons, containing more than 500,000 tons of metallic zinc; according to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B19/30C22B19/34
CPCC22B19/30C22B19/34Y02P10/20
Inventor 李世伟马爱元张利波彭金辉郑雪梅尹少华常军杨坤陈伟恒谢峰李浩宇
Owner KUNMING UNIV OF SCI & TECH
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