Method and equipment for preparing yellow phosphorus or phosphoric acid with vertical enclosed tobacco-partition kiln

Abstract

Discloses are a method and a device which adopt the vertical closed smoke separate kiln furnace to produce yellow phosphorus or phosphoric acid. The prepared ball material is added to the vertical closed smoke separate kiln furnace from the upper part; the ball material moves downwards due to the gravity of the ball material in the continuous discharge process on the lower part of the kiln furnace while the temperature is increased gradually; the reaction is processed to generate phosphor vapor and carbon dioxide; the kiln gas contains phosphoric anhydride is absorbed by the circulation acid spraying to obtain the high concentration phosphoric acid. The method and a device which adopt the vertical closed smoke separate kiln furnace to produce yellow phosphorus or phosphoric acid have the advantages that no wrapping agent is needed on the surface of the material, so as to simplify the process, reduce the cost and eliminate the weight of the wrapping agent which accounts on the ball material so that the phosphor yield rate of the ball material in unit weight; the reduction ambience and oxidation ambience of the vertical closed smoke separate kiln furnace is separated by the heating area of the smoke separate combustion; the problem that the carbon substance of the mixture ball material is oxidized in advance in the temperature increasing process is solved; the dosage of carbon reducing agent in the composite pellet is reduced; the production efficiency is improved.

Description

technical field [0001] The invention relates to a method for producing yellow phosphorus or phosphoric acid with a vertical closed smoke-insulated kiln; the invention also relates to a vertical airtight smoke-insulated kiln used in the process of producing yellow phosphorus or phosphoric acid with a vertical closed smoke-insulated kiln . Background technique [0002] Phosphoric acid production technology has been developed so far, and there are two main processes: (1) Wet method: use sulfuric acid to decompose medium and high-grade phosphate rock to produce phosphoric acid. , wet-process phosphoric acid has high impurity content, complex purification process, high cost, and the current domestic sulfur price continues to be high, resulting in a sharp increase in the cost of wet-process phosphoric acid; (2) thermal method: use electric furnace method to reduce phosphate rock to produce elemental yellow Phosphorus is then burned and absorbed in the combustion tower to produce ...

AI Technical Summary

Problems solved by technology

[0006] The main difficulties of the rotary kiln are ring formation at the kiln head, high outlet temperature, large dust and high cost of chemical protection; the main difficulties of the tunnel kiln are the high temperature resistance and anti-corrosion requirements of the green body protection materials, and the low thermal efficiency of the tunnel kiln, etc.

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