Novel phosphoric acid and polyphosphoric acid production technological method

Abstract

The invention relates to a novel phosphoric acid and polyphosphoric acid production technological method which is characterized by comprising the following two steps: combustion absorption and purification and arsenic removal; a directly connected spray gun of a phosphorus supply pump is changed to a plate-and-frame press filter by adopting the traditional production technological one-step method combustion absorption and hydration one-step method, different products adopt different structures and materials, a material 316L stainless steel jacket is adopted, an air stirrer is arranged, replacement is not needed, long-term operation can be ensured, and a transmission device for stirring is not needed; and by adopting the principle of being high in technical content, low in production cost, fewer in three wastes and easy in treatment, the invention provides a two-step technological method of combustion-hydration three-level absorption acid mist capturing and production of polyphosphoric acid.

Description

technical field [0001] The invention belongs to the phosphorus chemical industry, in particular to the phosphoric acid production method technology. [0002] technical background [0003] The preparation and production process of phosphoric acid generally has the following two types: ① thermal method yellow phosphorus is burned to form P 2 o 5 Phosphoric acid is obtained through the circulation and absorption of water or dilute phosphoric acid, and the combustion and hydration are completed in different towers; ② Wet-process phosphoric acid is extracted by sulfuric acid extraction of phosphate rock slurry and concentrated to obtain phosphoric acid. [0004] At present, thermal phosphoric acid basically uses a two-step process of yellow phosphorus combustion and hydration acid mist capture to produce 85% industrial phosphoric acid and polyphosphoric acid. [0005] Phosphorus combustion, every ton of yellow phosphorus burned produces 24392MJ (5.826x10 6 kcal) heat. In the a...

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Problems solved by technology

Usually in the process of production process control, in order to ensure that the material is not corroded, when the product is 85% industrial phosphoric acid, the acid temperature is required to be <80°C, and the water temperature is <60°C. further use

In order to ensure the flow and atomized combustion of yellow phosphorus, the melting phosphorus, phosphorus supply equipment and related pipelines in the production system require the yellow phosphorus to be in a liquid phase state, and additional coal-fired boilers need to be set up to supply steam. It is an unreasonable phenomenon that a large amount of combustion heat energy generated by itself due to heat supply cannot be rationally used and wasted

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