Normal temperature de-arsenic agent

A technology for removing arsenic at room temperature, applied in other chemical processes, chemical instruments and methods, etc., can solve the problems of low arsenic capacity and low arsenic removal efficiency of the arsenic removal agent, and achieve high arsenic removal efficiency, large specific surface area, and improved dispersion degree of effect

Active Publication Date: 2014-01-29
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] What the present invention aims to solve is the problem of low arsenic capacity and low arsenic removal efficiency of the prior art arsenic removal agent, and further provides a room temperature arsenic removal agent with high arsenic capacity, especially manganese dioxide and ferric oxide as the main Normal temperature arsenic removal agent with arsenic removal active component

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Mix 32kg of ferrous sulfate powder with 12kg of sodium hydroxide evenly, wherein the molar ratio of iron to hydroxide is 1:2.8; put the above mixed material into a kneader and knead for 3 hours to complete the solidification between the above reactants. Reaction, then the above reaction product is placed in the air to dry, in order to facilitate the full completion of the above reaction.

[0018] Stir the dried material with water first, and wash repeatedly until the obtained filtrate has no sulfate radicals (usually tested with barium chloride), and then use a centrifuge to filter the above washing liquid.

[0019] The above washed and filtered solid was dried at a drying temperature of 80° C. and a drying time of 3 hours to obtain amorphous iron oxyhydroxide. Calcining the above-mentioned amorphous iron oxyhydroxide at 320° C. for 6 hours can obtain ferric oxide.

[0020] Weigh 20kg of manganese dioxide obtained by roasting manganese carbonate at 320°C in the presenc...

Embodiment 2

[0022] Mix 64kg of ferrous sulfate powder and 21.2kg of sodium hydroxide evenly, wherein the molar ratio of iron to hydroxide is 1:2.4; put the above mixed material into a kneader, and knead for 0.5h to complete the reaction between the above reactants. The solid-phase reaction was carried out, and then the above reaction product was air-dried.

[0023] Stir the dried material with water first, and wash repeatedly until the obtained filtrate has no sulfate radicals (usually tested with barium chloride), and then use a centrifuge to filter the above washing liquid.

[0024] Amorphous iron oxyhydroxide can be prepared by naturally drying the above-mentioned washed and filtered solid at a drying temperature of -5°C and a drying time of 10 h. Calcining the above-mentioned amorphous iron oxyhydroxide at 330° C. for 5.5 hours can obtain ferric oxide.

[0025] Weigh 55kg of manganese dioxide obtained by roasting manganese carbonate at 330°C in the presence of water vapor, 35kg of fe...

Embodiment 3

[0027] Mix 34.2kg of ferrous nitrate powder and 23.4kg of potassium hydroxide evenly, wherein the molar ratio of iron to hydroxide is 1:2.0; put the above mixed material into a kneader and knead for 1.0h to complete the reaction of the above reactants The solid-phase reaction between them was carried out, and then the above-mentioned reaction product was placed in the air to dry.

[0028] Stir the dried material with water first, and wash repeatedly until the obtained filtrate has no sulfate radicals (usually tested with barium chloride), and then use a centrifuge to filter the above washing liquid.

[0029] Amorphous iron oxyhydroxide can be obtained by naturally drying the above-mentioned washed and filtered solid at a drying temperature of 45° C. and a drying time of 3 hours. Calcining the above-mentioned amorphous iron oxyhydroxide at 340° C. for 5 hours can obtain ferric oxide.

[0030]Weigh 55kg of manganese dioxide prepared by roasting manganese carbonate at 340°C in t...

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PUM

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Abstract

The invention relates to a normal temperature dearsenifying agent, which consists of active components and a carrier, wherein the carrier is clay; and the active components comprise manganese dioxide and ferric oxide. Particularly, the dearsenifying agent consists of the following components in percentage by weight: 20 to 55 weight percent of manganese dioxide, 10 to 45 weight percent of ferric oxide, and 10 to 35 weight percent of the carrier. Based on the dearsenifying agent, the invention further discloses a method for preparing the dearsenifying agent, and the dearsenifying agent prepared by the method has higher arsenic capacity.

Description

technical field [0001] The invention relates to a normal temperature arsenic removal agent with high arsenic capacity, which belongs to the technical field of arsenic removal and purification. Background technique [0002] In recent years, with the rapid development of my country's coal chemical technology, a new process of ammonia synthesis by pressurized gasification of coal water slurry has been introduced. Since the raw coal used contains arsenic compounds, there will also be a small amount of arsenic compounds in the synthesis gas, which will lead to permanent poisoning of the cobalt-molybdenum sulfur-tolerant shift catalyst in the ammonia synthesis process. Similarly, arsenic also exists in the petrochemical deep processing process, and its existence will also cause poisoning of many catalysts used in the process. Since arsenic has a strong ability to combine with the active components of the catalyst, and its damage to the catalyst is irreversible and permanent poiso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/06B01J20/30
Inventor 冯续蒲延芳闻学兵王宏伟刘彦芳
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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