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Method for preparing water-soluble fertilizer by recycling waste concentrated acid solution in photovoltaic industry and application thereof

A solution recovery and industrial technology, applied in liquid fertilizer, nitrate fertilizer, sewage/sludge fertilizer, etc., can solve problems such as difficult chlorophyll generation and crop yield reduction

Pending Publication Date: 2019-10-22
安徽至臻科技股份有限公司
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

If the supply of Mg is insufficient, chlorophyll will be difficult to produce, photosynthesis will no longer be carried out, resulting in crop yield reduction

Method used

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  • Method for preparing water-soluble fertilizer by recycling waste concentrated acid solution in photovoltaic industry and application thereof
  • Method for preparing water-soluble fertilizer by recycling waste concentrated acid solution in photovoltaic industry and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Get 100 parts of photovoltaic industry waste concentrated acid solutions (F7.5 parts, N5 parts), add 32.8 parts of potassium hydroxide (K 2 (25.9 parts) adjust the pH of the solution to about 10.3, add 49.44 parts of calcium nitrate (Ca7.91 part, N5.68 part), the reaction time is 40min, the reaction temperature is 30 ℃, and the standing time is 70min after filtration;

[0026] (2) Get 50 parts of (1) filtrate (Ca0 part, N4.49 part, K 2 (010.87 parts) in a stirred reaction vessel, add 25.0 parts of calcium nitrate (4 parts of Ca, 2.87 parts of N), stir for 30 minutes at about 25°C;

[0027] (3) Slowly add 64.52 parts of magnesium nitrate (6 parts of Mg, 6.9 parts of N) to (2), stir for 30 minutes at about 25°C, adjust the pH to 3-5 with 0.1mol / L dilute nitric acid solution to obtain a water-soluble fertilizer, Where: Ca:Mg:N:K 2 O=0.67:1:2.38:1.81, Ca+Mg=101g / L, N=143.94g / L, K 2 O=109.47g / L. Fluorine (F) = 0.2 mg / L, mercury (Hg) = 0.03 mg / L, arsenic (As), cadmium...

Embodiment 2

[0029] (1) Get 100 parts of photovoltaic industry waste concentrated acid solutions (F7.5 parts, N5 parts), add 33.76 parts of potassium hydroxide (K 2 (26.67 parts) adjust the pH of the solution to about 11.6, add 54.82 parts of calcium nitrate (Ca8.77 parts, N6.3 parts,), the reaction time is 30min, the reaction temperature is 20 ℃, and the standing time is 60min after filtration;

[0030] (2) Get 50 parts of the filtrate (0.35 parts of Ca, 4.63 parts of N, K 2 (010.93 parts) into a stirred reaction vessel, add 35.32 parts of calcium nitrate (5.65 parts of Ca, 4.06 parts of N), stir for 30 minutes at about 25°C;

[0031] (3) Slowly add 43.02 parts of magnesium nitrate (4 parts of Mg, 4.6 parts of N) to (2), stir for 30 minutes at about 25°C, adjust the pH to 3-5 with 0.1mol / L dilute nitric acid solution to obtain a water-soluble fertilizer, Where: Ca:Mg:N:K 2O=(1.5:1:3.32:2.73), Ca+Mg=106g / L, N=140.76g / L, K 2 O=115.75g / L. Fluorine (F) = 0.1 mg / L, mercury (Hg) = 0.02 mg / L...

Embodiment 3

[0033] (1) Get 100 parts of photovoltaic industry waste concentrated acid solutions (F7.5 parts, N5 parts), add 34.81 parts of potassium hydroxide (K 2 (27.49 parts) adjust the pH of the solution to about 12.2, add 59.82 parts of calcium nitrate (Ca9.57 parts, N6.87 parts), the reaction time is 30min, the reaction temperature is 20 ℃, and the standing time is 60min after filtration;

[0034] (2) Get 50 parts of the filtrate (0.64 parts of Ca, 4.64 parts of N, K 2 (010.74 parts) into a stirred reaction vessel, add 38.50 parts of calcium nitrate (Ca6.16 parts, N4.42 parts), at about 25 ° C, stir for 30 minutes;

[0035] (3) Slowly add 18.3 parts of magnesium nitrate (1.70 parts of Mg, 1.95 parts of N) to (2), stir for 30 minutes at about 25°C, and adjust the pH of the solution to 3-5 with 0.1mol / L dilute nitric acid solution to obtain Water-soluble fertilizer, of which: Ca:Mg:N:K 2 O=(4:1:6.47:6.31), Ca+Mg=106.1g / L, N=137.29g / L, K 2 O = 133.89 g / L. Fluorine (F) = 0.2 mg / L, m...

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Abstract

The invention discloses a method for preparing a water-soluble fertilizer by recycling a waste concentrated acid solution in photovoltaic industry and application thereof. Under certain conditions, sedimentation defluorination treatment is carried out on the waste concentrated acid solution in the photovoltaic industry by using calcium nitrate as a precipitant, a calcium fluoride precipitate is generated, fluorine ions inside the solution are removed, and then magnesium nitrate and calcium nitrate are added into an obtained filter liquor to prepare and obtain the water-soluble fertilizer. In the obtained water-soluble fertilizer, the total quantity of calcium and magnesium is greater than or equal to 100 g / L, the proportion of calcium to magnesium is adjustable, the quantity of nitrogen isgreater than or equal to 130 g / L, the quantity of potassium (K2O) is greater than or equal to 105 g / L, the quantity of fluorine is smaller than or equal to 2 mg / L, the quantity of mercury is smallerthan or equal to 3 mg / L, the quantity of arsenic is smaller than or equal to 5 mg / L, the quantity of cadmium is smaller than or equal to 5 mg / L, the quantity of lead is smaller than or equal to 5 mg / L, and the quantity of chromium is smaller than or equal to 5 mg / L. Seed soaking treatment is carried out on wheat, corn and rice by using the water-soluble fertilizer, equivalent clean water is takenas a reference, and the germination rate, germination potential, germination index, vital index, seedling length, seedling fresh weight, root fresh weight, peroxidase activity and catalase activity ofeach crop are improved in different degrees.

Description

technical field [0001] The invention relates to a chemical fertilizer, in particular to a method for preparing a water-soluble fertilizer from a waste concentrated acid solution in the photovoltaic industry and its application. Background technique [0002] The photovoltaic industry refers to the application and development of a series of silicon-based raw materials. The photoelectric conversion industry chain formed as a strategic emerging industry is developing rapidly. In the photovoltaic industry, fluorine-containing materials such as hydrofluoric acid will be used in the process of silicon material cleaning and battery preparation. Substances, this process has brought a waste concentrated acid solution containing a large amount of hydrofluoric acid, and in the waste concentrated acid solution, in addition to fluoride ions, there is also nitrogen, an essential nutrient element for plants, and the conventional method of removing fluoride is to use lime (containing calcium)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00A01C1/00
CPCC05C5/00A01C1/00C05G5/23C05C5/04C05F7/00Y02P60/12
Inventor 韩效钊郭婷婷常道春黄晗达邓小楠刘昆张旭徐超
Owner 安徽至臻科技股份有限公司
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