Blast furnace phosphoric acid production method and equipment

Abstract

The invention provides a blast furnace phosphoric acid production and an equipment; phosphate ore is proportioned for blast-furnace processing, sludge phosphorus is recovered through blast furnace gas, the sludge phosphorus is oxidized and combusted to absorb P2O5 in circulation manner. Compared with prior art, the invention adopts the method of firstly receiving sludge phosphorus and subsequently oxidizing and combusting the sludge phosphorus, not only can utilize medium and low grade phosphorite to produce blast furnace phosphoric acid, but also can completely solve the explosion problem of prior oxidation of blast furnace phosphoric acid production, and also improves the reduced phosphor recovery rate to 98% in blast furnace phosphor acid production process; a boiling sludge phosphorus calcinator is combined with a vertical multi-smoke channel natural circulation boiler to recover heat generated by the sludge phosphorus combustion so that the invention has significant meanings on saving energy and reducing consumption of the high energy-consumption blast furnace phosphor acid process, also on further comprehensive development and utilization aspects.

Description

technical field [0001] The invention relates to the technical field of phosphoric acid, in particular to a method and equipment for producing phosphoric acid using a blast furnace. Background technique [0002] The methods of producing phosphoric acid mainly include "wet process" phosphoric acid, "wet process" phosphoric acid is based on high-quality sulfur and phosphorus resources, but as a high-quality sulfur resource, more than 90% of sulfur comes from sulfur-containing petroleum and sulfur-containing The extraction of natural gas, therefore, "wet" phosphoric acid can also be said to be based on oil and natural gas resources, and oil and natural gas are non-renewable limited resources. Relevant data show that my country's oil reserves only account for 2.3% of the world's. Natural gas is less, accounting for only 1%. Therefore, "wet process" phosphoric acid is extremely unsuitable for my country's actual national conditions of lack of oil and gas. Although "wet process" phos...

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to solve the deficiencies of the prior art, provide a new production method of blast furnace phosphoric acid, completely solve the problem that the existing blast furnace phosphoric acid is prone to explosion when it is preferentially oxidized, and reduce the total phosphorus of blast furnace phosphoric acid The recovery rate is increased to more than 80%. At the same time, the existing equipment has been improved to better recover the heat generated by the oxidation and combustion of sludge phosphorus

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