Method for producing liquid fertilizer
A technology of liquid fertilizer and manufacturing method, which is applied in the directions of liquid fertilizer, inorganic fertilizer, fertilizer mixture, etc., can solve the problems of difficult liquid fertilizer and the like, and achieve the effect of low cost
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no. 1 approach
[0042] First, the first embodiment will be described.
[0043] figure 1 It is a step diagram showing the first embodiment of the manufacturing method of the liquid fertilizer of the present invention. figure 2 This is a graph schematically showing the relationship between the pH of the liquid phase at the end of the first precipitation step and the final recovery rate of phosphorus.
[0044] The method for producing a liquid fertilizer of the present invention is a method for producing a liquid fertilizer in which phosphorus is dissolved, and is characterized by comprising the steps of: mixing an acidic liquid with an object to be treated containing phosphorus and heavy metals, and making the object to be treated contain The first dissolution step of dissolving phosphorus and heavy metals; the first solid-liquid separation step of separating the first liquid in which phosphorus and heavy metals are dissolved from solid components; the heavy metal removal step of removing hea...
no. 2 approach
[0175] Next, a second embodiment of the present invention will be described. In the following description, points that are different from those of the above-mentioned embodiment will be mainly described, and descriptions about the same matters will be omitted. image 3 It is a process diagram showing the second embodiment of the manufacturing method of the liquid fertilizer of the present invention.
[0176] The manufacturing method of the liquid fertilizer of this embodiment has the following steps: a first dissolving step; a first solid-liquid separation step; a heavy metal removal step; a second precipitation step of precipitating phosphorus from a liquid in which phosphorus is dissolved; The fourth solid-liquid separation step of separating the second solid from the liquid; the third dissolution step of dissolving the second solid in the liquid containing nitric acid; the K component addition step; the N component addition step; the Mg component addition step and pH adjust...
Embodiment 1
[0263] First, sludge ash was prepared and dried at 110° C. for 2 hours so that the water content was 0%. This sludge ash contains Fe, Al, and Mg in addition to phosphorus and heavy metals.
[0264] Next, 200 mL of 1M hydrochloric acid was put into a 300 mL Erlenmeyer flask and heated at 80° C., then 10 g of sludge ash was added to the Erlenmeyer flask, and stirred for 40 minutes using a magnetic stirrer. Thus, phosphorus oxide in the sludge is eluted into phosphate ions (first dissolution step).
[0265] After stirring for 60 minutes, a filter paper was put in the filter, and solid-liquid separation was performed (first solid-liquid separation step).
[0266] Using a 500-mL volumetric flask, the first liquid, which is a filtrate (liquid phase) obtained after solid-liquid separation, was diluted (messup) in the volumetric flask to prepare a sample liquid.
[0267] Dilute the sample solution, measure the concentration of phosphorus by molybdenum blue absorptiometry, and calcul...
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