Method for removing arsenic hydride in tail gas of iron making blast furnace by wet process

An iron-smelting blast furnace and wet purification technology, applied in chemical instruments and methods, separation methods, arsenate/arsenite, etc., can solve the problems of secondary pollution, complex preparation process, high catalyst regeneration cost, and achieve Low cost, good removal effect, simple effect of purification equipment and purification process

Inactive Publication Date: 2012-03-28
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] There are problems in the above methods: (1) The research focus is on the development and preparation of catalysts, the preparation process is compli...

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  • Method for removing arsenic hydride in tail gas of iron making blast furnace by wet process

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Embodiment 1

[0016] Under normal temperature and pressure and airtight conditions, take 4.8 kg of commercially available granular NaOH with a purity of 96%, add 87.36 kg of distilled water, mix well, and prepare a NaOH alkali cleaning solution with a mass percentage of 5%; store the 0.63 m 3 Cl 2 (equivalent to a mass of 2kg of chlorine gas) through a gas meter into 951.5kg of distilled water to make HClO, the ClO introduced in this step 2 Amount and distilled water mass ratio are 2:951.5, and the HClO content in the prepared solution is 1.5kg; Get the 5% NaOH solution of 46kg and the HClO solution that has prepared and mix uniformly to get NaClO solution, put into reaction tower for subsequent use, the HClO:NaOH=1:1 in the solution, the available chlorine content is 0.1%, and the pH of the solution is 7. The arsine content is 800mg / m 3 The iron-making blast furnace tail gas passes through water washing, alkali washing, primary sodium hypochlorite reaction tower and secondary sodium h...

Embodiment 2

[0019] Under normal temperature and pressure and airtight conditions, take 7.08kg of commercially available granular NaOH with a purity of 96%, add 60.89kg of distilled water, mix well, and prepare a 10% NaOH alkaline cleaning solution by mass percentage; 0.5m 3 (converted to chlorine gas with a mass of 1.6kg) of Cl 2 Pass the gas meter into 962kg of distilled water to make HClO, the introduced Cl 2 Amount and distilled water mass ratio are 1.6:962, and the HClO content in the prepared solution is 1.2kg; Get the 10% NaOH solution prepared by 34kg and the HClO solution that has been prepared and mix to get NaClO solution, put into reaction tower for subsequent use, In this solution, HClO:NaOH=1:1, the available chlorine content is 0.08%, and the pH of the solution is 9. The arsine content is 1200mg / m 3 The iron-making blast furnace tail gas passes through water washing, alkali washing, primary sodium hypochlorite reaction tower and secondary sodium hypochlorite reaction to...

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PUM

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Abstract

The invention discloses a method for removing arsenic hydride in tail gas of an iron making blast furnace by a wet process. In the method, the tail gas of the iron making blast furnace is subjected to water washing and alkali washing to remove dust and acidic gas, then the tail gas is introduced into a reaction tower containing sodium hypochlorite, the arsenic hydride in the tail gas is removed by the strong oxidation action of sodium hypochlorite, and the thus, the tail gas is purified. With simple process and low treatment cost, the method is not limited by field, can treat complexly composed tail gas containing arsenic hydride and is suitable for industrial application.

Description

technical field [0001] The invention relates to a wet method for purifying arsine gas in tail gas of an ironmaking blast furnace, and belongs to the technical field of waste gas treatment and chemical industry. Background technique [0002] Arsine is a colorless gas and is a highly toxic gas, which is a waste gas produced in the production process of some industries. In industrial production, such as mining and non-ferrous metal smelting, various metals (such as zinc, tin, antimony, lead, copper, etc.) ores often contain arsenic compounds. When these ores encounter acids (sulfuric acid, hydrochloric acid) during smelting, processing, and storage, they can produce hydrogen sulfide, arsine, and phosphine. In addition, the manufacture of calcium carbide, the production and use of acetylene, the production of synthetic dyes, and the extraction of gold and silver by cyanide can all produce arsine, so arsine can be found in various industries, and the metallurgical industry is th...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/40B01D53/62B01D53/64C01G28/02
Inventor 宁平贾丽娟瞿广飞
Owner KUNMING UNIV OF SCI & TECH
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