A kind of calcined zinc oxide production process

A technology for calcining zinc oxide and production process, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problems of high product price, high production cost, high energy consumption, and achieve increased gloss and whiteness, low production cost, and reaction conditions. mild and friendly effect

Active Publication Date: 2017-01-11
梁鹤贤
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional process can produce calcined zinc oxide that meets the requirements of ceramic technology, but its energy consumption is high, the production cost is high, and the product price is also high

Method used

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  • A kind of calcined zinc oxide production process

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Embodiment

[0027] A production process for calcined zinc oxide, which comprises the following steps:

[0028] 1) Leaching: Using ammonia water and ammonium bicarbonate as the leaching solvent, the zinc in the secondary zinc oxide is leached to make a zinc ammonia complex solution; the main reaction formula of this step is as follows:

[0029] ZnO+3NH 3 ·H 2 O+NH 4 HCO 3 =Zn(NH 3 ) 4 CO 3 +4H 2 o

[0030] Specifically, the leaching is a two-stage type, which is carried out in two leaching tanks respectively. The filter residue after the first stage leaching is added to the second stage leaching tank under stirring and then leached, and the filter residue leached in the second stage is discarded. The secondary immersion solution from the second stage leaching is added to the first stage leaching tank as a leaching solvent, and the secondary zinc oxide is put into the first leaching tank under stirring, and the leaching primary immersion solution enters the next step, and so on. Am...

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Abstract

The invention relates to a calcined zinc oxide production technology. The calcined zinc oxide production technology is characterized in that a second zinc oxide raw material can be directly processed into calcined zinc oxide on one production line by increasing calcination temperature and prolonging calcination time on the basis of an ammonia process zinc oxide technology. The calcined zinc oxide production technology can be used for solving the problems of high energy consumption and high production cost of a conventional calcined zinc oxide production technology.

Description

technical field [0001] The invention relates to a production process of zinc oxide, in particular to a production process of calcined zinc oxide. Background technique [0002] In the ceramic industry, zinc oxide is mainly used in frit glazes, generally used in tile glazes, semi-transparent glazes for stoneware, and transparent coarse or cooked glazes for craft tableware. It is especially used in glazes and pigments for architectural ceramic wall and floor tiles and low-temperature enamel glazes and pigments. It is also widely used in art ceramic glazes and pigments. [0003] Ordinary grade zinc oxide has not been fully calcined, so when it is used directly on ceramics, it will cause pores (pinholes on the surface of ceramics), bubbles, cracks, or white spots on the painted parts due to the discharge of gas during high-temperature firing (and this The color moves to the colorless part) affects the quality of ceramic products. Therefore, ordinary grade zinc oxide generally ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G9/03
Inventor 黄有余
Owner 梁鹤贤
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