A kind of method utilizing shell to prepare calcium hydrogen phosphate
A technology of calcium hydrogen phosphate and shells, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of low resource utilization and pollution, and achieve the goals of improving the economic benefits of enterprises, reducing environmental pollution, and saving mineral resources Effect
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[0032] (2) Preparation of calcium carbonate or calcium oxide suspension
[0033] adding water to the pretreated shell powder obtained in step (1) to prepare a 20-35% shell powder suspension;
[0034] (3) At room temperature, add 40-60% phosphoric acid drop by drop to the shell powder suspension while stirring in proportion. After the dropwise addition, continue stirring for 30-60 minutes to make it fully react.
[0035] (4) After the reaction is completed, let the reaction solution stand for 30-60 minutes, remove the supernatant for later use, stir the precipitate evenly, vacuum filter, combine the filtrate with the removed supernatant, and then wash the precipitate until the pH of the washing solution is constant. The precipitate is calcium hydrogen phosphate.
[0036] (5) Dry the calcium hydrogen phosphate filter cake obtained in step (4) at 80-100°C to obtain feed grade calcium hydrogen phosphate, which contains P≥20%, Ca≥27%, and F≤0.15%. The content of calcium hydrogen ...
Embodiment 1
[0040] 1) Soak the shells in an acid solution with a mass concentration of 1-4% for 1-5 hours, wash the acid on the surface of the shells with pure water, brush off other impurities on the surface of the shells, dry and take 2000g of shells, and crush them into shells of 100-200 mesh The powder is the pretreated shell powder for subsequent use;
[0041] The acid solution may be hydrochloric acid, acetic acid or formic acid.
[0042] 2) Take 20g of the above shell powder, add 5ml of water, stir evenly, and make a 25% shell powder suspension;
[0043] 3) Add 15ml of 85% phosphoric acid to a 100ml beaker, add 10.5ml of purified water, that is, 50% phosphoric acid solution;
[0044] 4) Add 25.5ml of the 50% phosphoric acid solution prepared in step 3) dropwise to the shell powder suspension prepared in step 2) while stirring, to make it fully react. After adding the 50% phosphoric acid solution, continue stirring for 30 minutes;
[0045] 5) Let the above reaction solution stand ...
Embodiment 2
[0053] The difference from Example 1 is that the process conditions such as the ratio of calcium to phosphorus have been changed, see Table 2 for details.
[0054] Table 2 utilizes the conditions for preparing calcium hydrogen phosphate from different shell powders
[0055]
PUM
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