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Method for producing high-purity zinc oxide by steel mill smoke dust ash ammonia method decarburization

A zinc oxide and soot technology, applied in the direction of zinc oxide/zinc hydroxide, chemical industry, solid waste removal, etc., can solve the problem of reducing blast furnace zinc load economy, affecting the specific surface area and dispersibility, fluidity, loss, etc. of zinc oxide question

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

[0065] Raw material: soot dust 1# from a steel factory in Kunming, its composition in terms of mass percentage (%) is:

[0066] Zn9.7% Fe27.14% Pb0.85% Cd0.007% C28% Alkali metal (k, Na) 2.9%

[0067] The method for preparing high-purity zinc oxide:

[0068] (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%);

[0069] (2) Decarburization: The concentration of zinc oxide in the leach solution obtained after leaching is controlled at 50g / L, and decarburization is carried out by heating up. The method is: add 60g of slaked li...

Embodiment 2

[0074] Raw material: soot ash 2# from a steel factory in the south. The mass percentage (%) of its composition is:

[0075] Zn6.2% Fe29.6% Pb0.87% C15.24% Si8.7% Alkali metal (k, Na) 3.47

[0076] The method for preparing high-purity zinc oxide:

[0077] (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

[0084] Raw material: soot ash 3# from a steel factory in Southwest China, its composition is calculated by mass percentage:

[0085] Zn 15.4% Fe32.53% Pb0.67% C25.28% Si 8.67% Alkali metal (k, Na) 2.52%

[0086] The method for preparing high-purity zinc oxide:

[0087] (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 contai...

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Abstract

The invention discloses a method for producing a high-purity zinc oxide by steel mill smoke dust ash ammonia method decarburization. The method includes that an ammonia-water-ammonium-bicarbonate solution is utilized as a leaching agent for leaching, 0.3-0.5kg of sodium fluosilicate is added into the per cubic meter of the leaching agent, and after the leaching, 50-60kg of slaked limes are added in per cubic meter of a leaching agent liquid to perform warming decarburization. According to the method, the ammonia method is applied to smoke dust ash treatment, prior ammonia methods are subjected to adaptable improvement, the leaching speed and the leaching rate of zinc in the smoke dust ash are improved, zinc oxide with a large specific surface area can be obtained, simultaneously the purity can reach above 99.7%, by means of the method, the energy consumption is low, the efficiency is high, the leaching agent can be recycled, the problem of zinc load in the steel mill blast furnace smoke dust can be thoroughly solved, the purifying requirements for harmful ingredients of zinc and alkali metal in the steel mill can be met, virtuous circle of production is achieved, valuable ferrum and carbon resources in the steel mill can be recycled, the ferrum and carbon are enriched, the energy is saved, and good economic benefits are achieved.

Description

technical field [0001] The invention relates to a production method of zinc oxide, in particular to a production method of high-purity zinc oxide. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G9/02B09B3/00
CPCY02P20/10
Inventor 陈尚全李时春李晓红
Owner SICHUAN JUHONG TECH
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