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Method for preparing phosphoric acid by adding reaction promoters

A reaction accelerator, phosphoric acid technology, applied in phosphoric acid, phosphorus oxyacid, etc., can solve problems such as furnace body corrosion, high reaction temperature, and raw material melting

Active Publication Date: 2009-12-09
HUBEI XINGFA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction temperature of kiln-process phosphoric acid is too high, which may easily cause corrosion of the furnace body and the melting of raw material, which affects the continuous production of kiln-process phosphoric acid.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Hubei Wawu Phosphate Mine 250 copies (P 2 o 5 25.63%, CaO 38.69% Fe 2 o 3 1.54%), 170 parts of bituminous coal, 7 parts of ammonium chloride, ground to 80% and passed 200 mesh, stirred evenly, added 45 parts of water, and pressed into strips. Send it into a high-temperature roasting kiln, add a small amount of air in nitrogen, raise the temperature to 1250°C, and heat for 90 minutes. The P generated after the roasting oxidation reaction 2 o 5 The gas is sent to the absorption equipment to absorb P 2 o 5 Preparation of phosphoric acid. Obtain about 90 parts (concentration 85.12% H 3 PO 4 ) of phosphoric acid.

Embodiment 2

[0023] Hubei Wawu Phosphate Mine 250 copies (P 2 o 5 20.39%, CaO 29.14% Fe 2 o 3 2.37%), 80 parts of silica, 49 parts of anthracite, 3.4 parts of sodium sulfate. Grind until 80% passes through 200 meshes, stir evenly, add 50 parts of water, and press into blocks. Send it into a high-temperature roasting kiln, use 4A molecular sieve to remove most of the oxygen in the air, then send it into a high-temperature roasting kiln, raise the temperature to 1280°C, and heat for 90 minutes. The P generated after the roasting oxidation reaction 2 o 5 The gas is sent to the absorption equipment to absorb P 2 o 5 Preparation of phosphoric acid. Obtain about 70.6 parts (concentration 85.02% H 3 PO 4 ) of phosphoric acid.

Embodiment 3

[0025] Hubei Wawu Phosphate Mine 250 copies (P 2 o 5 25.63%, CaO 38.69% Fe 2 o 3 1.54%), 170 parts of bituminous coal, and 7 parts of ammonium chloride, ground to 80% and passed 200 mesh, stirred evenly, added 50 parts of water, and pressed into a spherical shape. Send it into a high-temperature roasting kiln, add a small amount of air in nitrogen, raise the temperature to 1230°C, and heat for 90 minutes. The P generated after the roasting oxidation reaction 2 o 5 The gas is sent to the absorption equipment to absorb P 2 o 5 Preparation of phosphoric acid. Obtain about 85 parts (concentration 85.05% H 3 PO 4 ) of phosphoric acid.

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Abstract

The invention discloses a method for preparing phosphoric acid by adding reaction promoters; salt or nitrogen-containing organic compound reaction promoters are added in rock phosphate powder, silica powder, carbonaceous reducing agents (silica process), or in rock phosphate powder, limestone powder and carbonaceous reducing agents (calcium process) and are molded by mixing; the mixture is sent into a kiln and is heated up to reaction temperature by pre-heating and heating-up; the produced phosphorus steam is made into high-concentration phosphoric acid after air oxidation and hydration adsorption. By adopting the method, P2O5 content is high, the reaction temperature is reduced by 100 DEG C, the reaction time is shortened, and high reduction ratio of phosphorite is kept within a wider temperature range. The method solves the problem of temperature difference in an industrial reactor, and greatly reduces the energy consumption, solves the softening and melting problem of molding material and lays a foundation for the large-scale industrial production. In addition, the production efficiency is high, the energy consumption is low and the equipment investment is low.

Description

technical field [0001] The invention relates to a method for producing phosphoric acid, in particular to a method for preparing phosphoric acid by adding a reaction accelerator. Background technique [0002] There are currently three production processes for phosphoric acid. (1) Wet phosphoric acid method, that is, extracting phosphate rock with sulfuric acid to generate calcium sulfate crystals and phosphoric acid. This method requires high-grade phosphate ore ore-beneficiated phosphate concentrate, and must have sulfur resources to produce sulfuric acid. The biggest problem is that phosphogypsum cannot be recycled in large quantities, and it will cause environmental pollution after being discarded, and there are environmental protection problems. (2) Electric furnace yellow phosphorus method, that is, use electric furnace to produce yellow phosphorus, and then use air to burn yellow phosphorus to produce P 2 o 5 , and then absorbed by circulating acid to produce high-c...

Claims

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Application Information

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IPC IPC(8): C01B25/18
Inventor 明兵袁兵殷宪国宁培栋余有平罗光典向正海
Owner HUBEI XINGFA CHEM GRP CO LTD
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