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Method for preparing compound fertilizer by utilizing phosphorus-containing sewage

A compound fertilizer and sewage technology, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of single phosphate fertilizer nutrient, water pollution, and poor fertilizer efficiency, and achieve the goal of saving phosphate rock resources, shortening reaction time, and reducing phosphorus pollution. Effect

Inactive Publication Date: 2016-03-02
GUIZHOU KAILIN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the phosphorus concentration in the water is too high, it will cause a large number of phytoplankton to multiply, make the water eutrophication, and cause the microorganisms in the water to lose balance, thereby causing water pollution. It is of great significance to alleviate the crisis of phosphorus resources
[0003] Along with industrial production, many chemical plants discharge a large amount of phosphorus-containing sewage. In order to pursue low-cost treatment of phosphorus-containing sewage, most enterprises adopt lime neutralization method to treat phosphorus-containing sewage, so that PO 4 3- 、HPO 4 2- Combining with calcium ions to form intolerant phosphate for solid-liquid separation, this method effectively removes PO in sewage 4 3- and HPO 4 2- , but phosphorus is discharged with sewage residue, which not only brings a burden to the environment, but also causes the loss of phosphorus resources
[0004] For this reason, some scholars apply phosphorus-containing sewage residues to the production of fertilizers to achieve the purpose of phosphorus recovery. They mainly prepare phosphate fertilizers by adding sulfuric acid or phosphoric acid, but this method is suitable for sewage residues with high phosphorus content. Single, the fertilizer effect is not good, and then it has little effect on actual production, and the economic prospect is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take by weighing the phosphorus-containing sewage slag 100g that moisture content is 5%, after it detects through electroosmotic method, obtain: total phosphorus content is 5.88%, and available phosphorus content is 5.61%, and water-soluble phosphorus content is 0.48%, adds 90mL water and After mixing well, add P while stirring 2 o 5 The content of phosphoric acid is 42g of 45.5%. After the phosphoric acid is added, after stirring for 40min, add 45g of nitric acid with a mass concentration of 60% while stirring. After the addition of nitric acid, stir for 40min to obtain a semi-finished product. Dry at 80°C until the moisture content is 8%, and obtain a compound fertilizer of calcium nitrate and calcium dihydrogen phosphate. After the compound fertilizer is tested by electroosmosis, the amount of available phosphorus is 16.7%, and the amount of water-soluble phosphorus is 12.8%. , the calcium nitrate content is 22%.

Embodiment 2

[0030] Take by weighing 200g of phosphorus-containing sewage residue with a moisture content of 8%, and after it is detected by ion exchange adsorption method, it is obtained that the total phosphorus content is 9.09%, the available phosphorus content is 8.61%, the water-soluble phosphorus content is 1.26%, and the calcium oxide content is 42%, add 182mL of water and mix it evenly, then add water content of 30%, P 2 o 5 The content of phosphoric acid is 45.5% phosphoric acid 168g, after treating that phosphoric acid has been added, after stirring 40min, while stirring, add the nitric acid 126g that mass concentration is 60%, after treating that nitric acid adds, after stirring 43min, obtain semi-finished product, semi-finished product is at temperature 100 Under the temperature of ℃, drying until the water content is 10%, the compound fertilizer of calcium nitrate and calcium dihydrogen phosphate is obtained, after the compound fertilizer is tested by electroosmosis, it is obt...

Embodiment 3

[0032] Take by weighing 10% phosphorus-containing sewage slag 100g with a moisture content, and after it is detected by the reverse osmosis method, it is obtained that the total phosphorus content is 7.13%, the available phosphorus content is 6.43%, and the water-soluble phosphorus content is 0.89%. After mixing evenly, add mass concentration 65%, P 2 o 5 The content of phosphoric acid is 115g of 43%. After the addition of phosphoric acid, after stirring for 48min, 63g of nitric acid with a mass concentration of 64% was added while stirring. After the addition of nitric acid, after stirring for 38min, a semi-finished product was obtained. Under the temperature of ℃, dry until the moisture content is 12%, obtain the compound fertilizer of calcium nitrate and calcium dihydrogen phosphate, after the compound fertilizer is tested by electroosmosis, obtain: the available phosphorus content is 28.05%, the water-soluble phosphorus content is 20.91%, Calcium nitrate content is 24%.

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Abstract

The invention belongs to the technical field of treatment of phosphorus-containing sewage and particularly relates to a method for preparing a compound fertilizer by utilizing phosphorus-containing sewage. In the method, sewage residue is obtained by utilizing lime to perform neutralizing treatment on phosphorus-containing sewage. According to the method, by first adding phosphoric acid and then adding nitric acid, calcium containing compounds in the sewage residue are fully converted to generate calcium nitrate and superphosphate; by the matching with quantity and concentration control over phosphoric acid and nitric acid, the content of phosphorus and water soluble phosphate is enhanced effectively, and the compound fertilizer of nitrate fertilizer and phosphorus fertilizer easily absorbed by plants is prepared. The phosphorus pollution is reduced, the loss of phosphorus resources is effectively reduced, and the compound fertilizer produced in the method contains both monocalcium phosphate and calcium nitrate and has the advantages of being low in production cost, simple in process and diversified in product nutrient.

Description

technical field [0001] The invention belongs to the technical field of phosphorus-containing wastewater treatment, and in particular relates to a method for preparing compound fertilizer from phosphorus-containing sewage residue. Background technique [0002] As a non-renewable resource, phosphorus is one of the essential nutrients for plant growth. Phosphorus can promote plant metabolism, growth and development, and plays an important role in life. However, when the phosphorus concentration in the water is too high, it will cause a large number of phytoplankton to multiply, make the water eutrophication, and cause the microorganisms in the water to lose balance, thereby causing water pollution. It is of great significance to alleviate the crisis of phosphorus resources. [0003] Along with industrial production, many chemical plants discharge a large amount of phosphorus-containing sewage. In order to pursue low-cost treatment of phosphorus-containing sewage, most enterpri...

Claims

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Application Information

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IPC IPC(8): C05G1/00
Inventor 魏发展朱飞武廖吉星何花
Owner GUIZHOU KAILIN GRP CO LTD
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