Slow release type azophoska compound fertilizer and production method thereof
A compound fertilizer, nitrogen-phosphorus-potassium technology, applied in urea compound fertilizer, nitrogen fertilizer, potash fertilizer and other directions, can solve the problems of unreasonable adjustment of fertilizer components, pollution of soil and natural environment, unsatisfactory slow-release effect, etc., and achieve low manufacturing cost. , the effect of improving soil and protecting the environment
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Embodiment 1
[0039] a. Phosphogypsum preparation: dry the phosphogypsum until the moisture content is less than 8%, crush it through a 20-mesh sieve, and set aside;
[0040] b. Preparation of phosphogypsum, fly ash sustained-release composition: according to the ratio of phosphogypsum: fly ash=1: 0.5-1 (parts by weight), accurately weigh the phosphogypsum and fly ash prepared in step a and The other components are evenly prepared and set aside;
[0041] c. Potassium ore powder is crushed, passed through a 60-100 mesh sieve, and set aside;
[0042] d. Ingredients and granulation: Accurately weigh 40 parts by weight of phosphogypsum prepared in step b, the fly ash slow-release composition, 20 parts by weight of urea, 20 parts by weight of acidified phosphate rock powder with hydrochloric acid, 1.5 parts by weight of potassium mineral powder, nitric acid 7.5 parts by weight of potassium, 6 parts by weight of potassium chloride, 1 part by weight of benzoquinone, 1 part by weight of dicyandiam...
Embodiment 2- Embodiment 6
[0046] According to the method and steps of Example 1, the slow-release nitrogen, phosphorus and potassium compound fertilizer of the present invention is prepared according to the formula in Table 1
[0047] Table 1
[0048] raw material
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