Production process of industrial grade and edible grade sodium hexametaphosphate

The production process of industrial grade and edible grade sodium hexametaphosphate

I. production principle

(1) phosphorus pentoxide method (anhydride method)

Yellow phosphorus was oxidized into phosphorus pentoxide (phosphoric anhydride), and then mixed with soda ash.

(2) sodium dihydrogen phosphate method

After calcining, dehydration and melting of sodium dihydrogen phosphate. Industrial grade sodium hexametaphosphate can be obtained by rapid cooling. For example, sodium dihydrogen phosphate is first purified by adding alkali sulfide to remove impurities such as arsenic and aluminum. After calcining, dehydration, melting and rapid cooling, food grade sodium hexametaphosphate can be obtained.

2. Raw material consumption

Raw material                                   specification                                     quantity (kg/t)

Sodium dihydrogen phosphate, phosphorus pentoxide process

Yellow phosphorus              industrial products                                  32.0                      359.0

caustic   soda                    industrial products                                  415.0

soda ash                           industrial products                                                             549.0

3. Operating process

(1) phosphorus pentoxide method

The yellow phosphorus is melted by the melting tank and then flows into the combustion furnace. After oxidation, it is cooled by the sedimentation chamber to obtain phosphorus pentoxide. It is stirred and mixed with soda ash in a ratio of 1:0.8, placed in a graphite crucible, melt-polymerized at 750-850 ° C, and then quickly taken out and cooled in a cooling tray to obtain a transparent glassy sodium hexametaphosphate. .

(2) sodium dihydrogen phosphate method

The sodium dihydrogen phosphate is dried and dehydrated, then placed in a graphite crucible and heated at a temperature of 700-800 ° C for 1-5 hours. Finally, it is rapidly cooled to obtain industrial grade sodium hexametaphosphate. For example, sodium hexametaphosphate can be used to purify and remove impurities such as arsenic and lead.

Zhengzhou Yucai Phosphate Chemical Factory specializes in the production of industrial grade sodium hexametaphosphate. It has a large number of stocks all year round, with a content of 68% high purity and instant dissolution. It can be used as a softener, corrosion inhibitor and dispersant. Industrial applications such as metal surface treatment agents, detergent builders, and cement hardening accelerators.

Packed in film bags, each bag has a net weight of 25 kg. Variety, specifications Qi [customizable]

Recruitment agent, the price is stable and the floating is small.