Method for preparing fulvic acid calcium magnesium fertilizers

Abstract

The invention discloses a method for preparing fulvic acid calcium magnesium fertilizers. The method includes the steps that 1, raw humic acid powder or sodium humate is added into gulonic acid mother liquor, the mixture is sufficiently stirred for 1 hour and centrifugally filtered, and filter liquor is collected; 2, ferrous sulfate is added into the filter liquor to be stirred, the mixture and oxalic acid generate ferrous oxalate, and filter liquor is collected after filtering is carried out; 3, the pH value of the obtained filter liquor is adjusted through calcium oxide to 2 to 4, the filter liquor is neutralized through magnesium hydrate till the pH value of the filter liquor ranges from 4 to 5, filtering is carried out, and filter liquor is collected; 4, the collected filter liquor is neutralized through potassium hydroxide till the pH value of the collected filter liquor ranges from 6 to 6.5, and fulvic acid calcium magnesium fertilizer intermediate products are obtained; 5, nutrients are added into the intermediate products, the mixture is mixed, dissolved and filtered, and filter liquor is prepared into the fulvic acid calcium magnesium fertilizers. According to the method, fulvic acid which can be conveniently absorbed by plants is generated after scientific harmless treatment is carried out on the gulonic acid mother liquor, the functional fulvic acid calcium magnesium fertilizers are prepared through the chelation performance of the fulvic acid, and the fulvic acid calcium magnesium fertilizers have the effects of resisting drought and diseases, promoting growth of crops and improving soil.

Description

technical field [0001] The invention relates to the technical field of novel fertilizers, in particular to a preparation method of calcium magnesium fulvic acid fertilizer. Background technique [0002] Fulvic acid has the unique effects of small molecular weight, high active gene, improving soil, increasing ground temperature, promoting root system development, effectively adjusting soil pH, and solving soil compaction. In the case of dry climate, it can reduce the stomatal opening of crops and has the effect of drought resistance. Fulvic acid is used in conjunction with other inorganic fertilizers (such as nitrogen, phosphorus, potassium, etc.), which can fix nitrogen, decompose phosphorus, and release potassium slowly, promote the transformation of active ingredients, be absorbed and utilized by crops as soon as possible, and improve the utilization rate of various active ingredients. [0003] The application of fulvic acid in vegetables: mainly to prevent the pollution ...

AI Technical Summary

Problems solved by technology

Some people have used guronic acid waste liquid to produce oxalic acid by oxidation method, but because the process involves sulfuric acid cycle and nitric acid cycle, the equipment requirements are high, the investment is large, and it will also produce secondary wastewater pollution and possible NO, NO 2 Such waste gas pollution caused secondary damage to the environment, so many similar projects were shelved; some people used its organic matter and acidity to make soil improvers, but due to the influence of the bacteria carried by gulonic acid, the beneficial bacteria in the soil were destroyed, making the Its application is limited

Therefore, the harmless treatment and rational utilization of gulonic acid mother liquor has become a technical problem restricting the development of the Vc industry