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

A nano-zinc oxide and soot technology, applied in the direction of zinc oxide/zinc hydroxide, nanotechnology, etc., can solve the problems of reducing the zinc load of blast furnaces, such as economy, high cost, and low recovery rate

Active Publication Date: 2012-12-19
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
[0011] 1. Due to the low zinc content in dust storage ash from steel mills (generally containing Zn%=5-22), the zinc concentration in the leaching solution is low, the consumption of leaching agents is large, and the cost is high, which cannot be afforded by the enterprise
[0012] 2. Due to the complex composition of impurities, the production can only be ordinary active zinc oxide products and the pass rate is low, the product price is low and the economic benefit is poor
[0013] 3. During leaching by conventional means, the leaching rate of soot and ash is low, the recovery rate is low, and the recovery of iron and carbon resources has not formed a complete chain, and the value of soot and ash has not been reflected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Raw materials: soot ash from a steel factory in Kunming 1 ＃ , and its composition by mass percentage (%) is:

[0076] Zn9.7% Fe27.14% Pb0.85% Cd0.007% C28% Alkali metal (k, Na) 2.9%

[0077] The method for preparing high-purity zinc oxide:

[0078] (1) Leaching: Take 500 grams of soot ash 1 ＃ , use 1500ml ammonia water-ammonium bicarbonate solution as leaching agent to carry out leaching; Wherein, in the leaching agent, NH 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 43.89 grams in the obtained zinc-ammonia complex solution (zinc recovery rate 90.5%);

[0079] (2) Pre-distillation of ammonia: Before the step of purification and removal of impurities, pre-distillation of ammonia is carried out. The method is: heat the leaching solution obtained after leaching to 105°C...

Embodiment 2

[0086] Raw material: soot ash from a steel factory in the south 2 ＃ The mass percentage (%) of its composition is:

[0087] Zn6.2% Fe29.6% Pb0.87% C15.24% Si8.7% Alkali metal (k, Na) 3.47

[0088] The method for preparing high-purity zinc oxide:

[0089] (1) Leaching: take 500 grams of soot ash 2 ＃ , use 1500ml ammonia water-ammonium bicarbonate solution as leaching agent to carry out leaching; Wherein, in the leaching agent, NH 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 through a 140-mesh sieve, and then undergo three-stage stirring and leaching. The leaching time of each stage is 2 hours. After solid-liquid separation, the obtained zinc-ammonia complex solution contains 28.37 grams of zinc...

Embodiment 3

[0097] Raw material: Soot from a steel factory in Southwest China 3 ＃ , and its composition is calculated by mass percentage as:

[0098] Zn 15.4% Fe32.53% Pb0.67% C25.28% Si 8.67% Alkali metal (k, Na) 2.52%

[0099] The method for preparing high-purity zinc oxide:

[0100] (1) Leaching: take 1000 grams of soot ash 3 ＃ , use 3000mL ammonia water-ammonium bicarbonate solution as the leaching agent for leaching; wherein, the NH in the leaching agent 3 The molar concentration of c(NH 3 )=5.8mol / L,CO 3 2- The molar concentration of c(CO 3 2- )=1.15 mol / L, add 1.2g of sodium fluorosilicate, 0.3g of surfactant SDS, and 3g of dicyandiamide respectively; when leaching, use ball milling, and ensure that the leaching time in the ball mill is 45 minutes. All the exported materials pass through a 140-mesh sieve, and then undergo three-stage stirring and leaching. The leaching time of each stage is 2 hours. After solid-liquid separation, the obtained zinc-ammonia complex solution ...

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Abstract

The invention discloses a method for producing high purity nanometer zinc oxide by using steel plant dust. The method for producing high purity nanometer zinc oxide by using steel plant dust comprises the following steps of: carrying out leaching with an ammonia-ammonium carbonate solution as the leaching agent, adding 0.3-0.5kg of sodium fluosilicate into the leaching agent per cubic meter, sequentially carrying out ammonia pre-steaming and purification and impurity removal, and finally carrying out refining treatment after purification and impurity removal. According to the method, the ammonia process is used for treating steel plant dust, the existing ammonia process is adaptively improved so that zinc in the steel plant dust can be fully recovered, and nanometer zinc oxide with the purity of more than 99.7 percent and the grain diameter of 10-60nm can be obtained by using the method; 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 as well as recovering valuable iron and carbon resources of steel plants.

Description

technical field [0001] The invention relates to a method for producing high-purity nano-zinc oxide by utilizing soot from steel mills. Background technique [0002] At present, soot ash from steel mills (including blast furnace ash, converter ash, electric furnace ash), also known as soot storage ash, will produce 35-90kg of soot ash for every ton of steel produced. This soot ash generally contains 15-30% iron %, containing 4-5% silicon oxide, 5-22% zinc, 25-55% combustible fixed carbon (C), 2-5% calcium oxide, 1-2% magnesium oxide, titanium, vanadium and alkali metals, 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] At present, the methods of limiting the zinc load of blast furnaces are as follows: one is to limit the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02B82Y40/00
Inventor 陈尚全李时春李晓红
Owner SICHUAN JUHONG TECH
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