Method for preparing organic fertilizer by using aminonitrile waste liquid

[0033] Example 1:

[0034] Add 50kg of sodium hydroxide to 1000kg of iminodiacetonitrile production waste liquid (total cyanide 50000mg/kg), mix evenly, use a pump to send the waste liquid to a heater for heating, adjust the steam feed volume, and heat it to 85°C , Enter the mixing reactor, control the pressure at 0.3MPa, then add 800kg of straw powder, stir and mix for 30 minutes to prepare 1850kg of base fertilizer, and send it to the base fertilizer warehouse.

[0035] Add 5000kg of base fertilizer to the fermentation tank, stir in 500kg of bran, 50kg of monoammonium phosphate, 50kg of potassium chloride, add tap water, adjust the moisture to about 45%, adjust the pH to 6 with sulfuric acid, and make the starting mixture by heating or cooling The temperature was 15°C, then 11kg of coryneform bacteria were added, mixed evenly and placed for fermentation. After 10 days, the fermentation was completed, and the fermented product was 6200kg, which contained 11.5% humic acid and 6.5% total nitrogen.

[0036] Add 2000kg of fermented product into the hydrolysis kettle, start stirring, then heat to 110℃, then add 60kg of sulfuric acid at a constant rate within 30min, heat up to 150℃ for 30min and continue the reaction for 120min, after the reaction is over, then neutralize the hydrolysis process with phosphate rock powder The excess acid in the phosphate reaches a pH of about 6.5, which is the raw material fertilizer for organic fertilizers. Then add 100kg of urea, 150kg of potassium chloride, 150kg of monoammonium phosphate, and 140kg of bentonite, then granulate, dry, and package to produce 2300kg of green organic fertilizer. The synthetic putrescine organic fertilizer contains a total of 16.1% of nitrogen, phosphorus, and potassium. %), the organic content is 30.7% (% by mass), total cyanide is not detected, and the product meets the national fertilizer standard GB18877~2002.

[0037]Example 2:

[0038] Add 55kg of sodium hydroxide to 1000kg of ethylenediaminetetraacetonitrile production waste liquid (total cyanide 42000mg/kg), mix evenly, use a pump to send the waste liquid to the heater for heating, adjust the steam feed volume, and heat to 70 After ℃, enter the mixing reactor, the pressure is controlled at 0.1MPa, and then 850kg of straw powder is added, and after mixing and reacting for 30 minutes, 1900kg of base fertilizer is prepared and sent to the base fertilizer warehouse.

[0039] Add 5000kg of base fertilizer to the fermentation tank, add 500kg of bran, 50kg of monoammonium phosphate, 50kg of potassium chloride, add tap water, adjust the moisture to about 48%, adjust the pH to 6.2 with sulfuric acid, and start by heating or cooling The temperature of the mixture was 25°C, and 11kg of coryneform bacteria were added, mixed evenly and placed for fermentation. After 8 days, the fermentation was completed to obtain 6250kg of fermented product, containing 11.4% of humic acid and 6.7% of total nitrogen.

[0040] Add 2000kg of fermented product to the hydrolysis kettle, start stirring, then heat to 105℃, then add 60kg of sulfuric acid at a constant rate within 30min, heat up to 145℃ for 30min and continue the reaction for 125min, then use phosphate rock powder to neutralize the hydrolysis process The excess acid in the organic fertilizer reaches a pH of 7, which is the raw material fertilizer for organic fertilizer. Then add 100kg of urea, 150kg of potassium chloride, 150kg of monoammonium phosphate, and 140kg of bentonite, then granulate, dry, and package to produce 2330kg of green organic fertilizer. The synthetic putrescine organic fertilizer contains a total of 15.9% of nitrogen, phosphorus, and potassium. (% by mass), organic matter content of 30.5% (% by mass), no total cyanide has been detected, and the product meets the national fertilizer standard GB18877-2002.

[0041] Example 3:

[0042] The iminodiacetonitrile production waste liquid (total cyanide 48000mg/kg) is continuously sent to the heater to be heated by the waste liquid pump at a rate of 1000kg/h. By adjusting the size of the steam feed volume, it is heated to 80°C, and 30kg After mixing with ammonia per hour, it enters the mixing reactor and mixes with 800kg of straw powder for 10 minutes, the pressure is controlled at 0.2MPa, and the material is discharged continuously to obtain 1830kg of base fertilizer and send it to the base fertilizer warehouse.

[0043] Add 5000kg of the prepared base fertilizer to the fermentation tank, add 500kg of bran, 50kg of monoammonium phosphate, 50kg of potassium chloride, add tap water, adjust the moisture to about 42%, adjust the pH to 6.5 with sulfuric acid, and heat or cool down The temperature of the starting mixture was 25° C., 11 kg of coryneform bacteria were added, and the mixture was evenly mixed and allowed to stand for fermentation. After 8 days, the fermentation was completed to obtain 6250 kg of fermented product, containing 11.4% humic acid and 7.2% total nitrogen.

[0044] Add 2000kg of fermented product in the hydrolysis kettle, start stirring, then heat to 110℃, then add 60kg of sulfuric acid at a constant rate within 30min, heat up to 140℃ for 30min and continue the reaction for 120min, the reaction is over, and then use phosphate rock powder to neutralize the hydrolysis process The pH of the excess acid is 7, which is the raw material fertilizer for organic fertilizer. Then add 100kg of urea, 150kg of potassium chloride, 150kg of monoammonium phosphate, 140kg of bentonite, and then granulate, dry, and package to produce 2340kg of green organic fertilizer. The synthetic putrescine organic fertilizer contains a total of 15.7% of nitrogen, phosphorus, and potassium. (% by mass), 30.2% of organic matter (% by mass), no total cyanide was detected, and the product complies with the national fertilizer standard GB18877-2002.

[0045] According to the above embodiment, the economic benefit analysis is as follows:

[0046] The workshop cost for treating 1 ton of imino waste liquid by the method of the present invention is 3588 yuan, and the market value of the obtained product organic fertilizer is 4,516 yuan. After deducting the processing cost, the gross profit is 928 yuan/ton of waste liquid. The ammonia diacetonitrile waste liquid is profitable, and the incineration and biochemical methods to treat the iminodiacetonitrile waste liquid cost as much as 3000 yuan/ton. Taking the production of 20kt/a iminobisacetonitrile and the production of 10kt/a imino waste liquid as an example, the use of the method of the present invention for resource treatment will have a profit and tax of nearly 9 million yuan, and the cost of treatment required by incineration and biochemical methods is 2000 More than 10,000 yuan, it can be seen that the social, economic and environmental benefits of treating imino waste liquid with the method of the present invention are significant.