Blended fertilizer based on steel production waste and preparation method thereof

Abstract

The invention discloses a blended fertilizer based on steel production waste and a preparation method thereof. The blended fertilizer is prepared by mixing 1-10 parts of steel making byproduct steel slag, 5-15 parts of waste powder formed by drying sintering flue gas ammonia desulfurization waste mud, and 3-6 parts of potassium fertilizer, wherein the total nutrient weight content of N, P and K is not lower than 35%. The preparation method comprises the following steps: preparing steel slag fine powder, waste powder and potassium fertilizer according to parts by weight, detecting to determine that the total nutrient weight content of N, P and K is not lower than 35%, and evenly mixing. The blended fertilizer disclosed by the invention contains sufficient nitrogen, phosphorus, potassium and microelements, and can sufficiently satisfy the nutrient requirements for plant growth without adding any microelement or fertilizer synergist, thereby achieving the synergistic and yield increase effects; the blended fertilizer has uniform and fine particle size, thereby avoiding soil salinization and hardening; and the invention recycles steel waste resources, thereby greatly lowering the production cost.

Description

technical field [0001] The invention relates to the field of agricultural fertilizers, in particular to a blended fertilizer based on iron and steel production waste and a preparation method thereof. Background technique [0002] Various fertilizers have been widely used in agricultural production, such as urea, ammonium bicarbonate, ammonium bisulfate, ammonium chloride, superphosphate, potassium fertilizer, and compound fertilizers containing nitrogen, phosphorus, potassium and various elements. These fertilizers are all processed through certain processes and have played an important role in my country's agricultural production. Among them, blended fertilizers, also known as dry blended fertilizers, are chemical fertilizers containing any two or three of the three nutrients nitrogen, phosphorus, and potassium. They are made from unit fertilizers or compound fertilizers through simple mechanical mixing. There is no significant chemical reaction during the mixing process, a...

AI Technical Summary

Problems solved by technology

[0003] The blended fertilizers currently used in agricultural production are mainly products made by blending large-grained urea, ammonium phosphate, and large-grained potassium fertilizers. The raw materials of these blended fertilizers are relatively expensive and the production cost is high; in addition, the shape of the blended fertilizer particles And the difference in particle size is large, and the blended fertilizer is affected by factors such as raw materials, technology, soil area, and climate. Long-term use of some fertilizers will easily lead to soil salinization and compaction, destroying the soil structure; at the same time, the lack of trace elements is also It will lead to an increase in crop diseases and insect pests, resulting in reduced crop yields

In the prior art, there are few reports on the use of iron and steel production waste to prepare blended fertilizers. Among them, the Chinese invention patent application publication with the publication number CN101265136A introduces a method for preparing solid calcium magnesium titanium iron sulfur nitrogen silicon compound fertilizer by quenching blast furnace slag with water. method, the method involves 200-500°C high temperature and other process conditions, and the operation is difficult; moreover, the method has very high requirements on the composition and properties of the raw materials, and the production cost is correspondingly increased; In terms of the required multi-nutrition, it is not ideal, and its scope of application is limited