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Zinc oxide concentrate purifying technology

A zinc oxide and concentrate technology, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problems of harsh equipment conditions, poor product uniformity, and high cost

Inactive Publication Date: 2015-06-17
李昭凌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above preparation methods all use high-purity zinc powder as raw material, the cost is high, the equipment conditions are harsh, the product uniformity is poor, and it is difficult to use in large-scale industrial production.

Method used

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  • Zinc oxide concentrate purifying technology
  • Zinc oxide concentrate purifying technology
  • Zinc oxide concentrate purifying technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1: a kind of zinc oxide concentrate purification process comprises the following steps:

[0051] (1) acid leaching

[0052] Put the zinc oxide concentrate in an acid-resistant container, slowly add concentrated sulfuric acid with a concentration of 80% to control the pH value at 4, stir continuously to fully dissolve the mineral powder; filter after 2 hours to remove the acid-insoluble matter, and keep filtrate;

[0053] (2) Oxidation and iron removal

[0054] Heat the first step filtrate to about 85°C, add H 2 o 2 , stirred at a constant speed for 1 hour; when the solution gradually turned yellow and the reaction was complete, continue heating and boiling for 10 minutes to remove excess H 2 o 2 , suction filtration, remove the yellow-brown floc suspension in the solution, and keep the filtrate;

[0055] (3) Manganese removal

[0056] Add ammonium persulfate precipitant to the filtrate of the second step to carry out precipitation reaction; after the p...

Embodiment 2

[0068] In Example 1, the precipitation agent in the sixth step is respectively Na 2 C 2 o 4 , (NH 4 ) 2 CO 3 , in urea and ammoniacal liquor, sodium hydroxide, the experimental result obtained is as follows:

[0069] Table 2 Morphology of calcined products obtained with different precipitants

[0070]

[0071] It can be clearly seen from Table 2 that when Na 2 C 2 o 4 When used as a precipitant, the final calcined products are all spherical particles. to (NH 4 ) 2 CO 3 When , the obtained product is mainly spherical particles, only a few needle-like ZnO whiskers. When using urea / ammonia water, more acicular ZnO whiskers can be produced. Only when sodium hydroxide is used as a precipitating agent, the final product obtained is relatively pure acicular or multi-acicular ZnO whiskers.

[0072] In addition, choose sodium hydroxide as precipitant, by changing ZnSO 4 Concentration, and fix it and the initial concentration ratio of precipitant solution, the morpholog...

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Abstract

The invention provides a zinc oxide concentrate purifying technology. According to the technology, zinc oxide concentrate is dissolved with concentrated acid, impurities are purified and removed by a filtering method, and then, zinc ions in the solution are precipitated to obtain pure zinc oxide. The pure zinc oxide is dried, baked and calcinated to obtain zinc oxide powder. The zinc oxide product has pure-phase ZnO of a hexagonal crystal system wurtzite structure, does not have other impurities, and has relatively sharper diffraction peaks and excellent crystallinity.

Description

technical field [0001] The invention relates to a process for purifying zinc oxide concentrate. Background technique [0002] ZnO powder, especially ZnO powder has many excellent properties, and has become an indispensable basic chemical raw material and new material for the national economy: (1) High strength, high modulus and isotropy, widely used as reinforcement of composite materials The skeleton can significantly improve the strength and modulus of the material, and can maintain the performance of the reinforced and toughened composite material with isotropic characteristics. For example, a large amount of zinc oxide is used in the production of radial tires. (2) High density and piezoelectricity can lead to large energy loss, so it has the effect of damping and damping. It can not only be used for noise reduction of sound-absorbing materials, but also for the impact and vibration reduction of plastics and rubbers, and can also be used to improve the performance of cer...

Claims

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Application Information

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IPC IPC(8): C01G9/02
Inventor 李昭凌
Owner 李昭凌
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