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Technology for removing arsenic in polyphosphoric acid

A technology for polyphosphoric acid and arsenic removal, which is applied in the field of arsenic removal technology and can solve the problem of single application range

Inactive Publication Date: 2010-03-24
胡金来
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Problems solved by technology

Mainly concentrated in some enterprises in Jiangsu and Shanghai and chemical research in Yunnan Province, the application range of products is relatively single, and the problem of low-level redundant construction is serious

Method used

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Examples

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Embodiment Construction

[0006] According to the characteristics of As energy S and the formation of insoluble compounds, by introducing hydrogen sulfide into the phosphoric acid solution or adding sulfides (such as sodium sulfide, phosphorus pentasulfide), the formation of precipitation at a certain temperature, and then by filtration to obtain low arsenic phosphoric acid . The amount of sulfide added depends on the arsenic content in the acid.

[0007] Industrially, the prepared arsenic remover is added to the reactor to react with arsenous acid in phosphoric acid to generate As 2 S 3 precipitation, then the As-containing 2 S 3 The phosphoric acid is pumped to the degassing tower for degassing (removing excess H 2 S gas), and then sent to the filter for filtration, the filtrate (phosphoric acid product) enters the finished product tank, and the filter residue (As 2 S 3 ) into the slag tube, and the exhaust gas is discharged into the atmosphere through the fan after being washed by the washing ...

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Abstract

The invention discloses a technology for removing arsenic in polyphosphoric acid, comprising the following steps: introducing hydrogen sulfide or sulfide (such as sodium sulfide, phosphorus pentasulfide and the like) into phosphoric acid solution; generating precipitate at a certain temperature; and obtaining low-arsenic phosphoric acid after filtering and separating. The low-arsenic phosphoric acid can satisfy the requirements of market and environment protection, is a key for expanding polyphosphoric acid application, and has wide market prospect.

Description

technical field [0001] The invention relates to a dearsenic process, in particular to a dearsenic process of polyphosphoric acid. technical background [0002] Thermal phosphoric acid is the basic raw material for the preparation of various industrial and agricultural phosphorus products, and is one of the important materials in the national economy. In recent years, with the increasingly serious energy shortage, the price of thermal phosphoric acid has also risen, thus causing the phosphorus chemical products that use it as raw materials to gradually lose market competitiveness. According to the constantly changing market demand, traditional industrial phosphoric acid has been difficult to adapt to the changing market demand. In order to give full play to the efficiency of the plant and make production and demand in line, it is necessary to continuously upgrade the plant products and develop new products with high added value. Combined with the characteristics of my countr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/234
Inventor 胡金来
Owner 胡金来
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