Method for producing silicon-calcium-magnesium fertilizer by using ironmaking blast furnace water-quenching slag as raw materials

Abstract

The invention discloses a method for producing a silicon-calcium-magnesium fertilizer by using ironmaking blast furnace water-quenching slag as raw materials. The method comprises the following steps of: (1) drying the water-quenching slag generated in a blast furnace ironmaking process; (2) adding 5-10wt% of quicklime in the dried water-quenching slag and delivering into a ball milling machine for ball milling; (3) adding 5-10wt% of binders and 10-15wt% of water into powder obtained after the ball milling, and granulating on a fertilizer granulating machine; and (4) drying the granulated fertilizer. The silicon-calcium-magnesium fertilizer prepared in the invention is granular and is different from a powdery silicon fertilizer produced in the past, so that the silicon-calcium-magnesium fertilizer is more convenient to apply in the fields for framers, and damages to crops because the fertilizer is attached to crop blades in a use process are also avoided. In addition, after the quicklime is added, the produced silicon-calcium-magnesium fertilizer has higher available nutrient content and has the effective silicon content capable of reaching more than 30%.

Description

technical field [0001] The invention relates to a method for producing silicon-calcium-magnesium fertilizer by using water-quenched slag of ironmaking blast furnace as raw material. Background technique [0002] Water-quenched slag is also called blast furnace slag. It is the waste slag formed by water-quenching and quenching blast furnace slag in the process of iron-making by iron and steel enterprises. Its main components are: SiO 2 , 34.9%, CaO 36.8%, A1 2 o 3 11.3%, MgO, 13.2%. [0003] The use of water-quenched slag as a fertilizer has a long history in Germany. At present, the main process of using blast furnace slag to produce silicon fertilizer in Germany is: crushing the blast furnace slag to a certain particle size and applying it directly, or crushing the blast furnace slag and mixing it with phosphate components for direct application. Japan adopts the air quenching method to rapidly cool the slag, and the primary utilization rate of heat recovery can reach ...

AI Technical Summary

Problems solved by technology

However, the above method has the disadvantages of complex production process, high processing temperature and low effective silicon content.

[0006] At present, the main problems in the research and development of silicon fertilizers: some silicon fertilizers are too expensive to be popularized and applied; some silicon fertilizers have low effective silicon content, and the effect of increasing production is not significant; some silicon fertilizers have high heavy metal content, and long-term application will increase the environmental risk of the soil

Due to cost considerations, some enterprises do not have a granulation process in the process of making silicon fertilizer. During the application of powdered silicon fertilizer, the dust phenomenon is serious, and the dust sticks to the plant body, and its alkaline substances cause damage to the plant.

Some traditional granular silicon fertilizers use water glass as a binder. The silicon fertilizer particles formed by it are hard and difficult to disperse and dissolve after being applied to the soil for a long time. It is difficult for plants to absorb the effective silicon, which greatly reduces the fertilizer efficiency of silicon fertilizers.