Settling agent for wet phosphoric acid refining desulfuration and using method thereof

A wet-process phosphoric acid and sedimentation agent technology, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of slow filtration speed, short time spent on filtration speed, long time spent on filtration, etc. Fast, time-consuming effect

CN102267691BActive Publication Date: 2013-01-23武汉睿远昌科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2013-01-23
Patent Text Reader

Abstract

The invention discloses a settling agent for wet phosphoric acid refining desulfuration. The settling agent is 0.1 to 1 mass percent aqueous solution; and the solute of the settling agent comprises nonionic flocculating agent and anionic surfactant in a mass ratio of 1: (0-75). A using method of the settling agent comprises the following steps of: adding barium salt into 75 percent phosphoric acid which is at the temperature of 60 DEG C and refined by extracting, wherein the stoichiometric ratio of the barium element in the barium salt to sulfate radicals in the phosphoric acid is 1:1; and continuously stirring the solution for 2 hours, adding the settling agent in a volume which is 0.05 to 1 percent of the volume of the phosphoric acid with stirring, continuously stirring the solution for 5 minutes to obtain phosphoric acid solution, putting the phosphoric acid solution into a settling tank, settling for 4 hours, filtering clear solution and settling slag respectively, delivering thetotal filtrate obtained by filtration to a concentration device, and performing concentration to obtain 85 percent industrial phosphoric acid. The using method is short in time, high in filtration speed, good in desulfuration effect and low in cost.
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Description

technical field

[0001] The invention relates to a desulfurization process of wet-process phosphoric acid, in particular to a sedimentation agent used for refining and desulfurization of wet-process phosphoric acid and a method for using the same, and is particularly suitable for desulfurizing 75% phosphoric acid after extraction and refining to obtain 85% industrial Phosphoric acid. Background technique

[0002] At present, in the process of purifying wet-process phosphoric acid by solvent extraction, a small amount of sulfate radicals brought by ortho acid will be extracted and cannot be completely removed, and a part will remain in the stripping liquid after stripping, which is concentrated after concentration. , will make the sulfate content in the industrial 85% phosphoric acid exceed the standard. To this end, barium salts must be added to cause the sulfate radical to form barium sulfate precipitation and be removed. Barium sulfate is a white solid that is insoluble i...

Examples

Embodiment 1

[0046] A method of using a sedimentation agent for wet-process phosphoric acid refining and desulfurization, which comprises the following steps in turn:

[0047] The first step: in the extracted and refined 75% phosphoric acid whose liquid temperature is not lower than 60 °C, first measure the content of sulfate in the phosphoric acid, and then add barium salt, sulfate and barium in the barium salt under stirring. The stoichiometric ratio is 1:1, then continue to stir for 2 hours to obtain the mixed solution;

[0048] The second step: firstly add the sedimentation agent to the above mixed solution under stirring, the volume of the sedimentation agent is 0.5‰ of the volume of phosphoric acid, and then continue to stir for 5 minutes to obtain the phosphoric acid feed solution, and then put the phosphoric acid feed solution into the sedimentation tank subsidence;

[0049] The third step: after 4 hours of sedimentation, collect the clear liquid on the upper part of the phosphori...

Embodiment 2

[0052] Step is with embodiment 1, difference is: the volume of sedimentation agent is 0.8‰ of phosphoric acid volume, clear liquid accounts for 85% of phosphoric acid feed liquid total volume, and filtration rate is 26M 3 / dM 2 , the sedimentation agent is an aqueous solution with a mass percentage concentration of 3‰, and the mass ratio of non-ionic flocculant to anionic surfactant is 1:15.

Embodiment 3

[0054] Step is with embodiment 1, difference is: the volume of sedimentation agent is 1‰ of phosphoric acid volume, clear liquid accounts for 90% of phosphoric acid feed liquid total volume, and filtration rate is 25M 3 / dM 2 , the sedimentation agent is an aqueous solution with a mass percentage concentration of 5‰, and the mass ratio of non-ionic flocculant to anionic surfactant is 1:25.