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Preparation of active zinc oxide from zinc dross by ultrasonic-microwave process

A technology of active zinc oxide and zinc dross, which is applied in the direction of improving process efficiency, can solve the problems of limiting the wide application of ultra-fine active zinc oxide, high production cost of ultra-fine active zinc oxide, and high energy consumption in the process, so as to shorten the calcination process. Time, overcome local overheating, good dispersion effect

Inactive Publication Date: 2004-09-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the current production process of ultrafine active zinc oxide, due to the high price of raw materials and high process energy consumption, leads to high production costs of ultrafine active zinc oxide, which limits the wide application of ultrafine active zinc oxide

Method used

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  • Preparation of active zinc oxide from zinc dross by ultrasonic-microwave process

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Experimental program
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Effect test

Embodiment 1

[0029] 1. Raw materials

[0030] Zinc dross is taken from a zinc factory, its composition and weight percentage: Zn 75-80%, Fe0.5-0.7%, S 1.2-2.0%, Cd (trace), Pb 0.087%, SiO 2 0.31%, As 0.088%, Sb 0.0023%, Co 0.0006%, Mn 0.84%, CI 0.5-2.0%.

[0031] 2. Zinc dross leaching

[0032] Use dilute sulfuric acid (1.4mol / L) to leach 1000g of zinc scum. The leaching conditions are as follows: the temperature is normal temperature, leaching and stirring for 50min, leaching for 2h, and the solid-liquid ratio is 1:6. Under this condition, the leaching rate of zinc is 92.5%. The leaching solution is filtered to remove SiO in the raw material 2 .

[0033] 3. Zinc sulfate solution purification

[0034] The purification of zinc sulfate solution is divided into three stages of purification, the first stage removes manganese; the second stage removes iron and arsenic; the third stage removes impurities such as lead, cadmium, and cobalt.

[0035] 3.1 Manganese removal

[0036] Ammonium ...

Embodiment 2

[0046] 1. Raw materials

[0047] Zinc dross is taken from a zinc factory, its composition and weight percentage: Zn 74-84%, Fe0.5-0.68%, S 1.6-2.0%, Cd (trace), Pb 0.08%, SiO 2 0.30%, As 0.078%, Sb 0.004%, Co 0.0008%, Mn 0.54%, CI 0.8-2.2%.

[0048] 2. Zinc dross leaching

[0049] Use dilute sulfuric acid (1.8mol / L) to leach 2000g of zinc scum. The leaching conditions are as follows: the temperature is normal temperature, the leaching is stirred for 60min, the leaching is 1.8h, and the solid-liquid ratio is 1:8. Under this condition, the leaching rate of zinc is 93.0%. The leaching solution is filtered to remove SiO in the raw material 2 .

[0050] 3. Zinc sulfate solution purification

[0051] 3.1 Manganese removal

[0052] Ammonium persulfate is used to directly remove manganese in zinc sulfate solution. The optimal process conditions for manganese removal are: temperature 93°C, pH value 5.4, reaction 3.5h, manganese removal rate over 99.90%, manganese content 0.00014...

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Abstract

A process for preparing active zinc oxide from floating Zn slags is characterized by that the ultrasonic cavitation and microwave heating are combined. Its advantages are short period and high product quality.

Description

[0001] Technical Field: Metallurgy and Chemical Technology Field technical background: [0002] At present, the zinc-containing raw materials used in the production process of preparing ultrafine active zinc oxide are finished zinc sulfate, zinc acetate, zinc oxalate, zinc nitrate or zinc ingots, and expensive sodium hexametaphosphate or dodecylbenzenesulfonic acid Sodium and other surfactants are used to treat the ultrafine active zinc oxide precursor, and the calcination adopts a general heating method. The heating starts from the outside of the raw material, and it takes a long time to complete the calcination process from the surface to the inside. Therefore, the current ultrafine activated zinc oxide production process, due to high raw material prices and high process energy consumption, results in high production costs for ultrafine activated zinc oxide, which limits the wide application of ultrafine activated zinc oxide. Invention content: [0003] The purpose of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/08C22B7/04
CPCY02P10/20
Inventor 彭金辉范兴祥张世敏郭胜惠张利波
Owner KUNMING UNIV OF SCI & TECH
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