three preparation methods of titanium phosphate_industrial additives

background and overview^[1]

as a new type of inorganic chemical product, titanium phosphate has the advantages of non-toxic, strong covering power, strong adhesion, strong uv reflection ability, heat resistance and flame retardancy. it can be used as a pigment and filler in color paste manufacturers. in industries such as coatings, plastics, rubber and papermaking, titanium phosphate can complex metal ions with a large radius and can also be used as a water treatment agent.

preparation^[1-3]

report 1,

weigh a certain amount of titanium dioxide waste acid and add it to the five-necked flask, then heat it to 80°c with a heating mantle, and pump it in with a peristaltic pump to a mass concentration of 5% (nh₄) ₂hpo₄ solution, complete within 5 minutes. the mass ratio of titanium dioxide mass to diammonium hydrogen phosphate in the titanium dioxide waste acid is 1:2.5. mix thoroughly and stir, keep warm for 5 minutes, slightly after cooling, filter and wash once with 200ml desalted water, then analyze the titanium content in the filtrate, and put the filter residue into a constant temperature oven at 105oc for 2 hours;

finally, grind the dried filter residue into fine pieces and put it into a crucible for calcination. the calcination temperature is 800°c and the calcination time is 2 hours to obtain the titanium phosphate product.

the performance of this group of filtrate and filter residue reaches the following indicators:

after analysis, the titanium content in the filtrate was 0.5%, and the removal rate of titanium was about 80%. x-ray analysis of the calcined sample showed that a large amount was titanium phosphate with a small amount of impurities.

report 2,

a method of producing titanium phosphate flame retardant by using titanium dioxide waste acid, which is characterized by adding phosphoric acid with a weight percentage concentration of 85% to waste sulfuric acid containing tio₂ to generate hydrated titanium phosphate. the mass ratio of phosphoric acid to tio₂ is 3:1; the generated hydrated titanium phosphate is washed with desalted water, precipitated and iron removed, dried at 105°c, and then roasted at 450°c for 2 hours. , after cooling, crush it to obtain white powder, which is the flame retardant titanium phosphate;

the reaction formula to generate hydrated titanium phosphate is as follows:

tioso₄+2mh₃po₄+nh₂o→tio₂·mp₂o₅·nh₂o↓+h₂so₄.

report 3,

use a plate and frame filter press to press and separate the acid residue mixture containing wet phosphoric acid to obtain a solid sedimentation residue filter cake (wet process phosphoric acid sedimentation residue), and then press the solid (filter cake) to liquid mass volume ratio of 1:1 add water and carry out cracking treatment. the cracked filter cake material is added to the reactor with pre-added water at a stirring speed of rpm and room temperature, and the total solid (filter cake) to liquid mass volume ratio is maintained at 1:5. , then add concentrated sulfuric acid to adjust the ca:h₂so₄ molar ratio in the material to 1:1.6. after reacting at room temperature for 6 hours, vacuum filtration separates to obtain the leachate; add the supersaturated solution of titanium sulfate to the leachate at a stirring speed of 300 rpm and room temperature, so that ti⁴⁺ and po₄^{3- is 3:4. after 4 hours of reaction, titanium phosphate precipitate is generated. the mixed material is separated by vacuum filtration to separate the solid material. after filtration, the filter residue is washed 5 times with water twice the volume of the solid material, and then heated at 120°c. after drying for 6 hours, a titanium phosphate product was obtained; the sample was analyzed to be amorphous titanium phosphate, containing 7.31% ti₂ and 23.48% p2.}