Method for producing high-purity zinc oxide by steel plant smoke ash ammonia method

A technology of zinc oxide and soot, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problems affecting the application field, affecting the specific surface area, dispersibility, fluidity, environmental pollution and so on of zinc oxide

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
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

[0068] Raw material: soot dust 1# from a steel factory in Kunming, its composition is calculated by mass percentage (%):

[0069] Zn9.7% Fe27.14% Pb0.85% Cd0.007% C28% Alkali metal (k, Na) 2.9%

[0070] The method for preparing high-purity zinc oxide:

[0071] (1) Activation: Take 500g of soot ash 1#, add 15g of slaked lime to obtain a mixture, ensure that the water content in the mixture is 8%, and activate it by stirring. The activation time is 36 hours;

[0072] (2) Leaching: use 1500ml of ammonia water-ammonium bicarbonate solution as the leaching agent to leaching the above-mentioned activated material; wherein, the 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 (zinc recovery rate 91.5%); ...

Embodiment 2

[0078] Raw material: soot ash 2# from a steel factory in the south. The mass percentage (%) of its composition is:

[0079] Zn6.2% Fe29.6% Pb0.87% C15.24% Si8.7% Alkali metal (k, Na) 3.47

[0080] The method for preparing high-purity zinc oxide:

[0081] (1) Activation: Take 500g of soot ash 2#, add 25g of slaked lime to obtain a mixture, ensure that the water content in the mixture is 10%, and activate it by stirring. The activation time is 36 hours;

[0082] (2) Leaching: use 1500ml of ammonia water-ammonium bicarbonate solution as the leaching agent to leaching the above-mentioned activated material; wherein, the 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 to add sodium fluorosilicate, SDS and dicyandiamine respectively; when leaching , use ball milling, and ensure that the leaching time in the b...

Embodiment 3

[0089] Raw material: soot ash 3# from a steel factory in Southwest China, its composition is calculated by mass percentage:

[0090] Zn 15.4% Fe32.53% Pb0.67% C25.28% Si 8.67% Alkali metal (k, Na) 2.52%

[0091] The method for preparing high-purity zinc oxide:

[0092] (1) Activation: take 1000g soot ash 3 ＃ , add 40g slaked lime to obtain the mixture, ensure that the water content in the mixture is 9%, and stir and activate, the activation time is 42 hours;

[0093] (2) Leaching: Use 3000ml of ammonia water-ammonium bicarbonate solution as the leaching agent to leaching the above-mentioned activated material; 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, respectively add 1.2g of sodium fluorosilicate, 0.3g of surfactant SDS, and 3g of dicyandiamide to add sodium fluorosilicate, SDS and dicyandiamine; , use ball milling, and ensure that the leaching time in the ball mill ...

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Abstract

The invention discloses a method for producing high-purity zinc oxide by a steel plant smoke ash ammonia method, comprising the following steps of: adding slaked lime of which the weight is 3-5% of the weight of steel plant smoke ash before leaching for activating in a stirring way, leaching the steel plant smoke ash which is activated in a stirring way by taking ammonia water-carbon ammonium liquid as leaching agent, and adding 0.3-0.5kg of sodium fluosilicate into each cubic meter. An ammonia method is applicable to the treatment of smoke ash, and the existing ammonia method is adaptively improved, so that the zinc leaching speed and leaching rate in the smoke ash can be improved. The treatment method disclosed by the invention is low in energy consumption, and high in efficiency, thoroughly solves the problem of the zinc load of the steel plant blast furnace smoke since leaching agent is recycled, meets the purification requirement of the steel plant to the harmful ingredients such as the zinc and the alkali metal, reaches the virtuous circle of the production, and not only saves the energy resources but also creates the good economic benefit.

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 Applications(China)
IPC IPC(8): C01G9/03
Inventor 陈尚全李时春李晓红
Owner SICHUAN JUHONG TECH
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