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Method for producing high purity nanometer zinc oxide by using ammonia process of steel plant dust

A nano-zinc oxide, soot technology, applied in zinc oxide/zinc hydroxide, nanotechnology and other directions, can solve problems such as environmental pollution, impact on application fields, and economic reduction of blast furnace zinc load

Active Publication Date: 2014-06-18
SICHUAN JUHONG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first method is not an economical and effective method to reduce the zinc load of blast furnace, but also brings environmental pollution
The second is to enrich zinc into the tailings, but the three products of iron concentrate, carbon concentrate, and tailings are out of balance, and high iron and carbon resources are still lost
High-temperature calcination seriously affects the specific surface area, dispersion and fluidity of zinc oxide, which in turn affects its application fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] Raw material: 1# soot dust from a steel mill in Kunming, its composition is calculated by mass percentage (%):

[0092] Zn9.7% Fe27.14% Pb0.85% Cd0.007% C28% Alkali metal (k, Na) 2.9%

[0093] The method for preparing high-purity nano zinc oxide:

[0094] (1) Activation: Take 500g of steel plant soot ash 1#, add 15g of slaked lime to obtain the mixture, add water to keep the water content of the mixture at 8%, and then perform mixing and activation. The activation time is 36 hours;

[0095] (2) Leaching: the mixed and activated steel plant soot ash 1 ＃ Leach with 1500ml ammonia water-ammonium bicarbonate liquid as leaching agent; Wherein, NH in the leaching agent 3 The molar concentration of c(NH 3 )=4.5mol / L,CO 3 2- The molar concentration of c(CO 3 2- )=1.2 mol / L, add 0.45g sodium fluorosilicate, carry out three stage leaching, each stage leaching time is 2 hours, after solid-liquid separation, zinc 44.38 grams in the obtained zinc-ammonia complex solution (zin...

Embodiment 2

[0101] Raw material: soot ash 2# from a steel mill in the south. The mass percentage (%) of its composition is:

[0102] Zn6.2% Fe29.6% Pb0.87% C15.24% Si8.7% Alkali metal (k, Na) 3.47

[0103] The method for preparing high-purity nano zinc oxide:

[0104] (1) Activation: Take 500g of steel plant soot ash 2#, add 25g of slaked lime to obtain a mixture, add water to keep the water content of the mixture at 10%, and then perform mixing and activation for 36 hours;

[0105] (2) Leaching: the mixed and activated steel plant soot ash 2 ＃ Leach with 1500ml ammonia water-ammonium bicarbonate liquid as leaching agent; Wherein, NH in the leaching agent 3 The molar concentration of c(NH 3 )=7mol / L,CO 3 2- The molar concentration of c(CO 3 2- )=1.5 mol / L, add 0.75g of sodium fluorosilicate, 0.075g of surfactant SDS, and 0.75g of dicyandiamide; when leaching, use ball milling, and ensure that the leaching time in the ball mill is 30 minutes. All the exported materials pass throug...

Embodiment 3

[0112] Raw material: soot ash 3# from a steel mill in Southwest China, its composition is calculated by mass percentage:

[0113] Zn 15.4% Fe32.53% Pb0.67% C25.28% Si 8.67% Alkali metal (k, Na) 2.52%

[0114] The method for preparing high-purity nano zinc oxide:

[0115] (1) Activation: Take 1kg of steel plant soot ash 3 ＃ , add 40g of slaked lime to obtain the mixture, and add water to keep the water content of the mixture at 9%, then mix and activate the activation time for 42 hours;

[0116] (2) Leaching: the mixed and activated steel plant soot ash 3 ＃ Leach with 3000mL ammonia water-ammonium bicarbonate liquid as leaching agent; Wherein, NH in the leaching agent 3 The molar concentration of c(NH 3 )=5.6mol / L,CO 3 2- The molar concentration of c(CO 3 2- )=1.05 mol / L, add 1.2g of sodium fluorosilicate, 0.3g of surfactant SDS, and 3g of dicyandiamide; when leaching, use ball milling, and ensure that the leaching time in the ball mill is 45 minutes. All the exported...

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Abstract

The invention discloses a method for producing high purity nanometer zinc oxide by using ammonia process of steel plant dust. According to the method, white lime of 3-5 percent of the mass of steel plant dust is added for activation before leaching, then leaching is carried out with an ammonia-ammonium carbonate solution as the leaching agent, 0.3-0.5kg of sodium fluosilicate is added into the leaching agent per cubic meter, and purification and impurity removal are carried out and then refining treatment is carried out. According to the method, the ammonia process is used for treating steel plant dust, the existing ammonia process is adaptively improved, and high purity nanometer zinc oxide with larger specific surface area can be obtained; and the method has the advantages of low energy consumption and high efficiency, and thoroughly solves the problem of zinc load of steel plant dust as the leaching agent can be recycled, thereby meeting the requirement of purifying the toxic components including zinc and alkali metals and realizing good production circulation.

Description

technical field [0001] The invention relates to a production method of zinc oxide, in particular to a production method of high-purity nanometer zinc oxide. Background technique [0002] At present, soot from steel mills (including blast furnaces, converters, and electric furnaces), also known as soot from steel mills, will produce 35-90kg of soot from steel mills for every ton of steel produced. This kind of soot from steel mills generally contains 15% iron ~30%, containing 4~5% of silicon oxide, 5~22% of zinc, 25-~55% of combustible fixed carbon, 2~5% of calcium oxide, 1~2% of magnesium oxide, titanium, vanadium and alkali metal, etc. . Under normal conditions, the sintered ore is generally used as a raw material for sintering, and is recycled in the steel plant. With the enrichment of the cycle, the zinc load into the furnace is getting higher and higher, which seriously affects the normal operation of the blast furnace. [0003] The current methods of limiting the zinc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G9/03B82Y40/00
Inventor 陈尚全李时春李晓红
Owner SICHUAN JUHONG TECH
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