Slow-release phosphate fertilizer regenerated from phosphorus-containing waste residue

Abstract

The invention relates to a slow-release phosphate fertilizer regenerated from phosphorus-containing waste residue, which realizes the purposes of slowing the release of phosphate fertilizer and prolonging the fertilizer efficiency period. The slow-release phosphate fertilizer is formed by drying, mixing and crushing 6-8 parts of phosphate ore tailing sand by weight, 2-4 parts of phosphate residue by weight, and 0.5-1 part of phosphorus mud residue by weight. The slow-release phosphate fertilizer regenerated from phosphorus-containing waste residue disclosed by the invention effectively utilizes phosphorus industrial waste residue, as well as is low in raw material cost, slow to release available phosphorus, long and stable in fertilizer efficiency period, low in application amount, and capable of effectively reducing soil hardening, thus effectively utilizing the phosphorus industrial waste residue and preventing excessive phosphorus which cannot be absorbed by plants in the phosphate fertilizer from being washed away with rainwater to pollute the water source of brooks, and then being beneficial to environmental protection.

Description

[0001] The invention belongs to the chemical fertilizer formulation technology, in particular to the long-acting phosphate fertilizer formulation technology capable of slowly releasing effective phosphorus nutrients in soil. Background technique [0002] Phosphate fertilizer is a popular chemical fertilizer, mainly quick-acting phosphate fertilizer, and the raw material comes from phosphate rock. Quick-acting phosphate fertilizers cannot be absorbed by plants in a short period of time in the soil, and flow into river ditches with rainwater, polluting water sources. Due to the frequent application, it is easy to cause soil compaction, and the economic cost also increases due to the large amount of use. [0003] Chinese patent ZL2005100486491 discloses a long-acting mixed phosphate fertilizer, which is 20%-30% by weight of phosphogypsum, 10%-20% of calcium-magnesium blast furnace waste, and the balance is secondary phosphate rock powder, sprinkled with 0.003% sub- Isobutyl diure...

AI Technical Summary

Problems solved by technology

[0004] Isobutylidene diurea is an expensive chemical. For every ton of fertilizer produced, 0.03KG of isobutylidene diurea is used, which increases the cost of the mixed phosphate fertilizer produced by this patented technology by 150 yuan per ton.