Electric calcination furnace and application of electric calcination furnace in preparing industrial-grade phosphoric acid

Abstract

The invention relates to the field of production devices of industrial-grade phosphoric acid, in particular to an electric calcination furnace adopted in the process for producing industrial-grade phosphoric acid by using low-grade phosphate rock. A specific application method of the electric calcination furnace adopted in the process of preparing the industrial-grade phosphoric acid comprises the steps as follows: firstly, the temperature inside the furnace is set to be 100 DEG C, then a rotating tube is started and preheated for one hour, the temperature inside the furnace is heated to 250 DEG C, and the rotating tube is preheated for half an hour again; and materials are uniformly fed, solid materials are directly rolled into a hydrolyzing barrel, gaseous materials enter a fluorine recycling barrel from six gas collecting pipes at the top, pyrophosphoric acid and iron-aluminum oxides are solidified after the materials are calcinated, the spilt gas is hydrogen fluoride, and the temperature is controlled to be 100 DEG C during discharging. The electric calcination furnace is adopted for preparing the industrial-grade phosphoric acid and is low in energy consumption, simple in process, easy to operate, low in cost and capable of effectively saving energy.

Description

technical field [0001] The invention relates to the field of industrial-grade phosphoric acid production equipment, in particular to an electric calciner used in the production of industrial-grade phosphoric acid using low-grade phosphate rock. [0002] [0003] Background technique [0004] In the prior art, there are two production methods of industrial-grade phosphoric acid, one is thermal phosphoric acid: because more impurities such as iron, aluminum, calcium, and magnesium are contained in phosphate rocks in my country, P 2 o 5 The phosphate rock with a mass percentage of more than 27% is heated to about 1350°C by electric heating method to generate P-containing steam, which is then calcined with oxygen to produce phosphoric acid and then phosphate. This method consumes high energy and is Pollution is large, and it is a project to be phased out. The other is wet-process phosphoric acid: this method will produce impurities such as aluminum oxide, iron oxide, and calc...

AI Technical Summary

Problems solved by technology

More than 60% of the phosphate rocks in my country are low-grade phosphate rocks, most of which are less than 25%. To use wet acid production, this part of phosphate rocks must be washed before use, which increases production costs and causes a lot of waste of resources.

The kiln method to produce industrial-grade phosphoric acid technology has not been applied in industrial production, and there are still technologies that have not been broken

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