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 so

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1

[0028] Weigh 100g of phosphorus-containing sewage slag with a moisture content of 5%, and test it by electroosmosis. The total phosphorus content is 5.88%, the effective phosphorus content is 5.61%, and the water-soluble phosphorus content is 0.48%. Add 90 mL of water and After mixing well, add P while stirring 2 O 5 42g of phosphoric acid with a content of 45.5%. After the addition of phosphoric acid is completed, after stirring for 40 minutes, add 45g of nitric acid with a mass concentration of 60% while stirring. After the addition of nitric acid, after stirring for 40 minutes, a semi-finished product is obtained. Dry at 80°C to a moisture content of 8% to obtain a compound fertilizer of calcium nitrate and calcium dihydrogen phosphate. After the compound fertilizer is tested by electro-osmosis, the effective phosphorus content is 16.7% and the water-soluble phosphorus content is 12.8% , The calcium nitrate content is 22%.

Example Embodiment

[0029] Example 2

[0030] Weigh 200g of phosphorus-containing sewage slag with a moisture content of 8% and detect it by the ion exchange adsorption method. The total phosphorus content is 9.09%, the effective phosphorus content is 8.61%, the water-soluble phosphorus content is 1.26%, and the calcium oxide content Is 42%. After adding 182mL of water and mixing it evenly, add water content of 30%, P 2 O 5 168g of phosphoric acid with a content of 45.5%. After the addition of phosphoric acid is completed, after stirring for 40 minutes, 126g of nitric acid with a mass concentration of 60% is added while stirring. After the addition of nitric acid, after stirring for 43 minutes, a semi-finished product is obtained. After drying at ℃ to a moisture content of 10%, a compound fertilizer of calcium nitrate and calcium dihydrogen phosphate is obtained. After the compound fertilizer is tested by electroosmosis, the effective phosphorus content is 32%, and the water-soluble phosphorus conten...

Example Embodiment

[0031] Example 3

[0032] Weigh 100g of phosphorus-containing sewage slag with a moisture content of 10% and test it by reverse osmosis. The total phosphorus content is 7.13%, the effective phosphorus content is 6.43%, and the water-soluble phosphorus content is 0.89%. Add 88 mL of water and After mixing uniformly, add the mass concentration of 65%, P 2 O 5 115g of phosphoric acid with a content of 43%. After the addition of phosphoric acid is completed, after stirring for 48 minutes, 63g of nitric acid with a mass concentration of 64% is added while stirring. After the addition of nitric acid is completed, after stirring for 38 minutes, a semi-finished product is obtained. After drying at ℃ to a moisture content of 12%, a compound fertilizer of calcium nitrate and calcium dihydrogen phosphate is obtained. After the compound fertilizer is tested by electroosmosis, the effective phosphorus content is 28.05% and the water-soluble phosphorus content is 20.91%. The calcium nitrate co...

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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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