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Method for producing magnesium ammonium phosphate fertilizer by using light roasting powder to process phosphorus-containing and nitrogen-containing waste water

A technology of ammonium magnesium phosphate and light burning powder, which is applied in water/sewage treatment, water treatment parameter control, chemical instruments and methods, etc., can solve the problems of natural ecological environment hazards, mining cost waste, etc., and achieve good economic benefits and environmental protection Benefits, reduced production costs, and low-cost effects

Inactive Publication Date: 2017-12-12
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the recovery rate of first-grade magnesite in domestic mines is less than 50%, and the lowest is only 20%. Most enterprises produce about 2 tons of abandoned magnesite tailings for every ton of valuable magnesite ore mined. Only Liaoning The abandoned magnesite produced in the surrounding areas of Haicheng is about 36 million tons per year. Based on the mining input cost of 30 yuan / ton, plus the value of abandoned tailings at 20 yuan / ton, the direct economic loss and mining cost waste caused by 1.8 billion The waste of resources and economic losses caused by the waste of tailings will exceed 5 billion yuan, and the damage to the natural ecological environment is immeasurable.
However, the method of using the lightly burned powder obtained by calcining low-grade magnesite as an adsorption precipitant to treat phosphorus-containing and nitrogen-containing wastewater to produce magnesium ammonium phosphate fertilizer has not been reported yet.

Method used

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  • Method for producing magnesium ammonium phosphate fertilizer by using light roasting powder to process phosphorus-containing and nitrogen-containing waste water
  • Method for producing magnesium ammonium phosphate fertilizer by using light roasting powder to process phosphorus-containing and nitrogen-containing waste water
  • Method for producing magnesium ammonium phosphate fertilizer by using light roasting powder to process phosphorus-containing and nitrogen-containing waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take 100mL nitrogen-phosphorus ratio m(N):m(P)=0.4 (N concentration is 120mg / L, P concentration is 300mg / L) phosphorus-containing and nitrogen-containing simulated wastewater 6 parts respectively in 6 large beakers, of which Add 0.7g of 65% lightly burned powder to each of 3 parts, add 0.7g of 89% lightly burned powder to each of the other 3 parts, stir at a stirring speed of 150r / min for 25min, settle for 30min; take the supernatant to measure nitrogen and phosphorus content, calculate the removal rate of nitrogen and phosphorus, and at the same time take the precipitate and observe the shape of the precipitate under a microscope. The results are shown in the table below and attached figure 1 .

[0033] 65% lightly burned powder denitrification and phosphorus removal results

[0034]

[0035] 89% denitrification and dephosphorization results of lightly burned powder

[0036]

Embodiment 2

[0038] Take 100mL nitrogen-phosphorus ratio as n(N):n(P)=1.0:1.0, substance concentration is 0.1mol / L, (N concentration is 1400mg / L, P concentration is 3100mg / L) phosphorous and nitrogenous simulated wastewater Put 6 parts into 6 large beakers respectively, change the dosage of 65% lightly burned powder, stir at a stirring speed of 150r / min for 25min, and settle for 60min; take the supernatant to measure the content of nitrogen and phosphorus, and calculate the removal of nitrogen and phosphorus At the same time, the precipitate was taken to observe the shape of the precipitate under a microscope, and the results are shown in the table below.

[0039] Nitrogen and phosphorus removal results of high concentration nitrogen and phosphorus wastewater by 65% ​​lightly burned powder

[0040]

Embodiment 3

[0042] Take 10 parts of 800mL phosphorus-containing simulated wastewater with a phosphorus concentration of 300mg / L and place them in 10 large beakers respectively, 5 parts of which are added with 8g of 65% lightly burned powder, and the other 5 parts are added with 89% lightly burned powder 6.4 g, stir at a stirring speed of 150r / min for 25min, settle for 3h; take the supernatant to measure the phosphorus content, calculate the phosphorus removal rate, and take the precipitate to observe the shape of the precipitate under a microscope, and dry the precipitate for later use. The results are shown in the table below and attached drawings.

[0043]Take 8 parts of 100mL nitrogen-containing simulated wastewater with a nitrogen concentration of 150mg / L and place them in 8 large beakers respectively, of which 4 parts are added with 65% lightly burned powder to treat 0.9g of phosphorus-containing wastewater sediment, and the other 4 parts are each Add 89% lightly burned powder to tre...

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Abstract

The invention discloses a method for producing a magnesium ammonium phosphate fertilizer by using light roasting powder to process phosphorus-containing and nitrogen-containing waste water, and relates to a method for producing the magnesium ammonium phosphate fertilizer. The method comprises the following steps: using the light roasting powder obtained by calcining low-grade magnesite as a raw material, according to 10-15:1:0.6-1 of the optimal chemometry mole ratio of Mg:P:N in a mixed reaction system, adding the light roasting powder and phosphorus or nitrogen to the waste water containing the phosphorus and ammonia nitrogen, stirring in the normal temperature and pressure, stewing and precipitating, wherein the obtained precipitate is a controlled release fertilizer containing the magnesium ammonium phosphate. About the waste water which contains the phosphorus only and contains the nitrogen only, according to 10-20:1 of the optimal chemometry mole ratio of Mg:P, a certain amount of the light roasting powder is added to the waste water containing the phosphorus for recycling the phosphorus, the pH value of the reaction system is regulated, and the stirring reaction is executed in the normal temperature and pressure, the precipitate obtained by stewing and precipitating is the controlled release fertilizer containing the magnesium ammonium phosphate.

Description

technical field [0001] The invention relates to a method for producing magnesium ammonium phosphate fertilizer, in particular to a method for producing magnesium ammonium phosphate fertilizer by treating waste water containing phosphorus and nitrogen with lightly burned powder. Background technique [0002] Light-burned powder is made of magnesite as raw material, which is roasted and finely ground. It has rich raw materials and stable quality. my country is the country with the most abundant magnesite resources in the world. The total reserves of ore are 3 billion tons, accounting for 2 / 3 of the world's total. At present, the recovery rate of first-grade magnesite in domestic mines is less than 50%, and the lowest is only 20%. Most enterprises produce about 2 tons of abandoned magnesite tailings for every ton of valuable magnesite ore mined. Only Liaoning The abandoned magnesite produced in the surrounding areas of Haicheng is about 36 million tons per year. Based on the ...

Claims

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Application Information

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IPC IPC(8): C05B11/00C02F1/58C02F101/10C02F101/16
CPCC02F1/58C02F2101/105C02F2101/16C02F2209/06C05B11/00
Inventor 刘桂萍刘长风毕颖唐蕊王俊凯
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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