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Method for simultaneously and comprehensively recycling zinc ash and high-arsenic zinc oxide in iron and steel plant

A high-arsenic zinc oxide, iron and steel plant technology, applied in zinc sulfate, solid separation, flotation and other directions, can solve the problem of complex operation of hydrogen peroxide, achieve obvious economic and social benefits, achieve clean production, avoid secondary The effect of pollution

Inactive Publication Date: 2014-03-05
HENGYANG NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Handling with hydrogen peroxide is therefore complicated: wear appropriate protective clothing, gloves and goggles or a mask

Method used

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  • Method for simultaneously and comprehensively recycling zinc ash and high-arsenic zinc oxide in iron and steel plant

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Embodiment 1

[0055] A method for simultaneously comprehensively recycling iron and steel plant zinc ash and high-arsenic zinc oxide, firstly using camellia oleifera meal extract as a flotation agent to recover iron in the zinc ash by flotation. The preparation method of the camellia oleifera meal extract is as follows: dissolving the camellia oleifera meal in water (the liquid-to-solid weight ratio is 2:1 when dissolving), and saponifying with 2% NaOH for 2 hours at 70°C. After filtration, the filtrate was concentrated to half of the original volume and washed with an appropriate amount of 20% H 2 SO 4 Adjust the pH to 5.8. The amount of unsaturated fatty acid (saponification) in the flotation agent is 6%; the amount of tea saponin is 8%. Relative to 100 parts by weight of iron and steel factory zinc dust, the amount of flotation agent is 0.5 parts by weight. The pH value of the flotation is 5.8, the temperature of the flotation is 35° C., and the flotation time is 2 hours. The final f...

Embodiment 2

[0058] A method for simultaneously comprehensively recycling iron and steel plant zinc ash and high-arsenic zinc oxide, firstly using camellia oleifera meal extract as a flotation agent to recover iron in the zinc ash by flotation. The preparation method of the camellia oleifera meal extract is as follows: dissolving the camellia oleifera meal in water (the liquid-to-solid weight ratio is 2:1 when dissolving), and performing saponification with 1% NaOH at 80°C for 2 hours. After filtration, the filtrate was concentrated to half of the original volume and washed with an appropriate amount of 20% H 2 SO 4 Adjust the pH to 5.5. The amount of unsaturated fatty acid (saponification) in the flotation agent is 7%; the amount of tea saponin is 9%. Relative to 100 parts by weight of iron and steel factory zinc dust, the amount of flotation agent is 0.5 parts by weight. The pH range of flotation is 5.5; the temperature of flotation is 37°C, and the flotation time is 3 hours. The soli...

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Abstract

The invention provides a method for simultaneously and comprehensively recycling zinc ash and high-arsenic zinc oxide in an iron and steel plant. A great deal of iron in the zinc ash is recycled by using unsaturated fatty acid (saponified) and tea saponin intermixture in tea-oil dregs in a flotation manner; the zinc ash (subjected to flotation) and the high-arsenic zinc oxide in the iron and steel plant are respectively leached by using sulfuric acid; As<3+> in the high-arsenic zinc oxide is rapidly oxidized by using peroxy-sodium carbonate; corresponding indissolvable arsenate is generated after As<3+> is oxidized into As<5+> in the presence of Fe<3+> and Fe<2+>, and arsenic in the solution is eliminated by virtue of a secondary arsenic elimination method; zinc powder is purified to generate zinc sulfate, and the purpose that two varieties of waste slags are simultaneously and comprehensively recycled is achieved.

Description

technical field [0001] The invention relates to a method for comprehensively recycling iron and steel plant zinc dust and high-arsenic zinc oxide at the same time. Background technique [0002] Iron and steel plants will produce a large amount of zinc dust during the steelmaking process, in which the zinc content is about 30%, and the iron content is as high as more than 40%. With the rapid development of my country's iron and steel industry, the annual production of zinc ash continues to increase. If it is directly used as returned ore, it will have a negative impact on blast furnace smelting. Most manufacturers now adopt stacking treatment, which leads to occupying a large amount of land, pollutes the surrounding environment, and also causes waste of zinc and iron resources contained in zinc ash. How to dispose of the zinc ash economically and simply is a key issue for recycling zinc and iron resources. Generally, the processes for treating zinc-containing materials mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/06B03D1/008
Inventor 邓培红张复兴杜红张军
Owner HENGYANG NORMAL UNIV
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