Settling agent in wet-method phosphoric acid concentration processing process

Abstract

An excellent settling agent used for processing the concentration of wet-method phosphoric acid is prepared by sending 40-93 parts by mass of an anionic flocculating agent, 1-30 parts by mass of a non-ionic flocculating agent, 1-40 parts by mass of an adsorbent and 0-20 parts by mass of a fluorine removal agent to a stirring tank, controlling the temperature of the stirring tank in a range of 60-80DEG C through heating and heat insulation via a jacket, and allowing the solution obtained after stirring ending to stand for 10-40min. The excellent settling agent has the advantages of low prices and easy purchasing of the above used raw materials, simple preparation, less consumption, obvious shortening of the settling time of the concentration of wet-method phosphoric acid, effective reduction of the fluorine content, reduction of the contents of cations comprising Al<3+>, Fe<3+>, Ca<2+>, Mg<2+>, Si<4+> and the like, and realization of the clear texture and low impurity content of the produced concentrated wet-method phosphoric acid, and provides a high-quality raw material for subsequent production.

Description

technical field [0001] The invention relates to the technical field of sedimentation and impurity removal production of concentrated wet-process phosphoric acid, in particular to an excellent settling agent in the concentration treatment process of wet-process phosphoric acid. Background technique [0002] At present, the wet-process phosphoric acid obtained by leaching phosphate rock with sulfuric acid is concentrated and then naturally settled in a settling tank to obtain a finished product. Due to the high viscosity of the concentrated wet-process phosphoric acid, the shear stress suffered during the natural sedimentation process is relatively large, which increases the internal friction of the fluid, hinders the sedimentation rate of phosphoric acid, reduces production efficiency, and increases production costs. [0003] The use of wet-process phosphoric acid settling agent can significantly shorten the settling time, improve the settling efficiency, reduce the number of...

AI Technical Summary

Problems solved by technology

[0006] At present, the current status of phosphorus chemical production, the grade of phosphate rock is relatively low, and the concentration of concentrated wet-process phosphoric acid produced is 46~48%P 2 o 5 Left or right, the viscosity is relatively high, the solid content and impurity ion content are high, the time required for natural sedimentation is long, the number of storage tanks is large, the space occupied is large, the production efficiency is low, and the concentrated wet-process phosphoric acid produced is The quality of the product is not high, which increases the difficulty of subsequent processing and affects the quality of downstream products