Method for preparing active silicon@active humic acid composite fertilizer from inferior coal, and composite fertilizer obtained by using same

Abstract

The invention provides a method for preparing an active silicon@active humic acid composite fertilizer from inferior coal, and the active silicon@active humic acid composite fertilizer prepared by using the same. The method comprises the following steps: crushing the inferior coal, successively adding an oxidizing agent and water-soluble silicate, and carrying out grinding so as to obtain a composite fertilizer. According to the invention, the method does not use water as a solvent, so the effect of saving water and energy is significant; meanwhile, the extraction rate of a humic acid component in the inferior coal and the yield of a product are significantly improved; the product is easily dissolved and dispersed in water; and the use requirements of facility agriculture for a foliar silicon fertilizer or a flush silicon fertilizer are effectively met. The method provided by the invention has strong adaptability to inferior coal raw materials with different sources, is extensively-available in raw materials, prominent in atomic economy and low in processing and manufacturing cost, and has the product facilitating promotion and utilization.

Description

Technical field [0001] The invention relates to the technical field of compound fertilizers, in particular to a method for preparing active silicon@active humic acid compound fertilizer from low-quality coal, and a compound fertilizer containing active silicon and active humic acid obtained by the method. Background technique [0002] As we all know, nitrogen, phosphorus, and potassium are the three essential nutrient elements for crops, and silicon as an important medium element for crop growth, its application in agriculture has received increasing attention at home and abroad. For example, 70%-80% of the farmland in Japan has been applied with silicon fertilizer, and the area using silicon fertilizer in South Korea, the United States, Australia, and Taiwan has reached more than 50%. Silicon fertilizer is the fourth element in addition to nitrogen, phosphorus and potassium. It cannot replace compound fertilizer, but it can balance the absorption of nitrogen, phosphorus and pota...

AI Technical Summary

Problems solved by technology

Although the foliar fertilizer obtained by this invention can combine humic acid and silicon fertilizer, and improve the extraction rate of humic acid in weathered coal, in this method, the amount of water added is 30-50 times that of weathered coal and it needs to be heated It takes a long time to react at about 80°C; it needs to be separated by filtration to obtain liquid fertilizer, which is not only cumbersome to operate and consumes a lot of energy; moreover, in the obtained product, the content of active components such as fulvic acid and silicate ion is relatively low. Low, directly increases the preparation cost and use cost of fertilizer

In addition, this method has a low extraction rate for low-quality coal with a humic acid content of less than 55%, poor product quality and unsatisfactory use effects, etc., making it difficult to popularize and apply; it also makes the humic acid extraction technology that uses coal as raw material so far and product application development are severely constrained

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