CN1569770A - Process for producing organic compound fertilizer using papermaking waster liquid - Google Patents

Abstract

The invention discloses a process for producing organic compound fertilizer from paper-making waste liquid. The paper-making waste liquid is waste liquid from wheatgrass ammonium pulping and paper-making. The process is a closed-circuit circulation process. The specific process steps are as follows: It is concentrated by pipe spraying and sent to the thermal insulation storage tank; then, the concentrated solution is sprayed onto an organic carrier for granulation, and dried and crushed to form a solid dry powder; then, nitrogen, phosphorus, potassium, and medium and micronutrients are added Elements and conditioning agents; finally, the product is made by mixing, spraying and granulating, drying and cooling, coating and sieving. It has the characteristics of less investment, fast start-up, labor saving, water saving, no pollution, environmental friendliness, turning waste into wealth and reducing costs.

Description

Process of producing organic compound fertilizer from papermaking waste liquid

technical field

The invention belongs to the technical field of preparing organic compound fertilizers, and relates to a process for producing organic compound fertilizers by using papermaking waste liquid, in particular to a process for producing organic compound fertilizers by using wheatgrass ammonium pulping and papermaking waste liquids.

Background technique

Wheatgrass ammonium pulping and papermaking waste liquid contains 0.45% of organic nitrogen, 0.74% of inorganic nitrogen, 0.65% of potassium oxide, 4-5% of organic matter and 0.35% of residual ammonium.

There are more than 2,000 local small and medium-sized papermaking enterprises in China. Generally, the daily discharge of waste liquid is calculated as at least about 300 tons. The nitrogen content in it is equivalent to 7.5-8 tons of urea, and the content of K ₂ O is equivalent to 3.5-4 tons of potassium sulfate. It contains organic matter equivalent to 15-18 tons of wheat straw, more than 1 ton of residual ammonium, and a small amount of phosphorus, silicon and micronutrients.

If these nutrient-rich waste liquids are directly discharged into rivers, it will not only waste resources, but also cause eutrophication of water bodies, leading to serious deterioration of the ecological environment. If the farmland is directly irrigated, due to the imbalance of the nutrient elements contained in it and the excessive content of reducing substances, it will cause physiological toxicity of crops and lead to a significant reduction in agricultural production.

The ecological environment pollution caused by the discharge of waste liquid in the paper industry occurs from time to time. In order to protect the environment, some enterprises have been forced to stop production one after another, which directly affects the development of the paper industry and the revitalization of the local economy.

Contents of the invention

The purpose of the present invention is to provide a process for producing organic compound fertilizer by using papermaking waste liquid, so as to help the papermaking industry rationally process waste liquid, solve the problem of waste liquid discharge, and at the same time turn waste into treasure, and use papermaking waste liquid to produce organic compound fertilizer . The invention can achieve zero discharge of papermaking waste liquid, recycle and reuse 70-80% of water, and realize zero-cost treatment of papermaking waste liquid.

The above-mentioned purpose of the present invention is achieved like this: a kind of papermaking waste liquid is produced the technique of organic compound fertilizer, and this papermaking waste liquid is wheat grass imonium pulping and papermaking waste liquid, and this technique is a closed loop flow process technology, is characterized in that, has The following process steps:

First, the waste liquid is concentrated by pipe spraying and sent to the thermal insulation storage tank;

Next, spray the concentrated solution onto an organic carrier for granulation, and dry and pulverize to form a solid dry powder;

Then, add nitrogen, phosphorus, potassium, medium and micronutrient elements and conditioning agents;

Finally, the product is made by mixing, spraying and granulating, drying and cooling, coating and sieving.

The process of the present invention is characterized in that: the solid content in the concentrated solution is 30-50%, and the organic carrier is any one or any combination of peat, weathered coal, and fermented straw.

The process of the present invention is characterized in that: the organic carrier is a powder smaller than 1 mm.

The process of the present invention is characterized in that: the crushing is super-speed blade crushing.

The process of the present invention is characterized in that: the pulverization is closed negative pressure pulverization, the granulation is spray drum granulation, and the drying is jet vortex hot air drying.

The present invention will be further described in detail below in conjunction with specific embodiments.

Detailed ways

Example 1

First, the waste liquor from wheatgrass pulping and papermaking is concentrated by means of heat pipe spraying, so that the solid content in the concentrate reaches a concentration of 40%, and then the concentrate is sent to the thermal insulation storage tank;

Next, spray the concentrated solution onto the peat powder with a diameter of 0.25-1 mm for granulation. The weight percentage of the concentrated solution and peat is controlled at 2:1, and dried in a rotary drying kiln, and then crushed with an ultra-speed blade pulverizer. form a solid dry powder;

Then, add 5% ammonium sulfate, 20% urea, 15% monoammonium phosphate, 5% calcium magnesium phosphate fertilizer, 15% potassium sulfate, 1.% manganese sulfate, 0.5% ammonium molybdate and 5% attapulgite powder as conditioning agent;

Finally, it is stirred and mixed by a vertical mixer, and then transported to the drum granulator, and the concentrated waste liquid with a pressure of 0.4mPa is used for spraying and drum granulation. It is dried by the airflow of 240 degrees Celsius in the rotary drying kiln, and cooled by cold air in the rotary cooler. , and then the finished product is atomized and coated by 0.4mPa pressure spray n-butyl stearate in the wrapping machine, and finally, sieved to make the product.

The invention can produce products containing nitrogen, phosphorus and potassium ≥ 40% (15-7-8), organic matter ≥ 20%, and trace elements ≥ 0.2%.

Example 2

Firstly, the waste liquid from wheatgrass pulping and papermaking is concentrated by hot plate spraying, so that the solid content in the concentrated liquid reaches a concentration of 40%, and then the concentrated liquid is sent to the thermal insulation storage tank;

Next, the concentrated solution is sprayed onto fermented straw powder with a diameter of 0.25-1 mm for granulation, the weight percentage of the concentrated solution and the fermented straw is controlled at 1:1, and the vortex hot air is sprayed and dried by a belt fluidized bed dryer. Immediately crush it with a ball mill to form a solid dry powder;

Then, add 10% ammonium sulfate, 15% urea, 16% superphosphate, 10% potassium chloride, 1.0% zinc sulfate and 5% zeolite powder as conditioning agents;

Finally, it is stirred and mixed by a horizontal flap mixer, then transported to the drum granulator, and the concentrated waste liquid with a pressure of 0.6mPa is used for spraying and drum granulation, and is dried by airflow at 270 degrees Celsius in a rotary drying kiln. After being cooled by the intercooler, the finished product is atomized and coated by spraying hard 15% n-butyl fatty acid at a pressure of 0.8mPa in the wrapping machine, and finally sieved to make the product.

The invention can produce products containing nitrogen, phosphorus and potassium ≥ 25% (12-6-7), organic matter ≥ 20%, and trace elements ≥ 0.2%.

Example 3

Firstly, the waste liquor from wheatgrass pulping and papermaking is concentrated by hot pipe spraying or hot plate spraying, so that the solid content in the concentrated liquid reaches 50% concentration, and then the concentrated liquid is sent to the thermal insulation storage tank ;

Next, spray the concentrated liquid onto the weathered coal powder with a diameter of 0.25-0.5 mm for granulation, the weight percentage of the concentrated liquid and the organic carrier is controlled at 1:1, and dry through a rotary drying kiln, a belt type or a plate type fluidized bed Machine jet vortex hot air drying, then crushed by ultra-speed blade, steel mill, ball mill pulverizer to form solid dry powder;

Then, add 5% ammonium sulfate, 10% urea, 20% monoammonium phosphate, 8% calcium magnesium phosphate fertilizer, 15% potassium sulfate, 4% potassium chloride, and 1.0% borax (or boric acid), zinc sulfate 0.5% molybdenum Conditioning agents such as ammonium acid and 5% attapulgite powder or zeolite powder;

Finally, it is stirred and mixed by a vertical mixer or a horizontal flap mixer, and then transported to a drum granulator, and the concentrated waste liquid with a pressure of 0.4-0.6mPa is used for spray drum granulation, and passed through a rotary drying kiln at 240-270 °C. It is air-dried at high temperature, cooled by cold air in the rotary cooler, and then the finished product is atomized and coated by spraying n-butyl stearate at a pressure of 0.4-0.8mPa in the wrapping machine, and finally sieved to make the product.

The invention can produce products containing nitrogen, phosphorus and potassium ≥ 30% (10-10-10), organic matter ≥ 20%, and trace elements ≥ 0.2%.

Example 4

Firstly, the waste liquid from pulping and papermaking of wheatgrass is concentrated by hot pipe spraying or hot plate spraying, so that the solid content in the concentrated liquid reaches a concentration of 40%, and then the concentrated liquid is sent to the thermal insulation storage tank ;

Next, spray the concentrated solution onto the mixed organic powder of 0.25-1 mm diameter peat and 50% weathered coal for granulation, the weight percentage of the concentrated solution and the organic carrier is controlled at 1.5:1, and pass through a rotary drying kiln , belt-type or plate-type fluidized bed dryer spray vortex hot air drying, and then crush it with ultra-speed blade type, steel mill, ball mill pulverizer to form solid dry powder;

Then, add 5% ammonium sulfate, 15% urea, 14% monoammonium phosphate, 18% potassium sulfate, 5% potassium chloride, and 0.5% borax or boric acid, 0.5% zinc sulfate and manganese sulfate and 5% attapulgite Or conditioners such as zeolite powder;

Finally, it is stirred and mixed by a vertical mixer or a horizontal flap mixer, and then transported to a drum granulator, and the concentrated waste liquid with a pressure of 0.4-0.6mPa is used for spray drum granulation, and passed through a rotary drying kiln at 240-270 °C. It is air-dried at high temperature, cooled by cold air in the rotary cooler, and then the finished product is atomized and coated by spraying n-butyl stearate at a pressure of 0.4-0.8mPa in the wrapping machine, and finally sieved to make the product.

The invention can produce products containing nitrogen, phosphorus and potassium ≥ 30% (12-6-12), organic matter ≥ 20%, and trace elements ≥ 0.2%.

Example 5

Firstly, the waste liquid from pulping and papermaking of wheatgrass is concentrated by hot pipe spraying or hot plate spraying, so that the solid content in the concentrated liquid reaches a concentration of 40%, and then the concentrated liquid is sent to the thermal insulation storage tank ;

Next, spray the concentrated liquid onto the weathered coal with a diameter of 0.25-1 mm and 50% of the mixed organic powder of fermented straw for granulation, the weight percentage of the concentrated liquid and the organic matter carrier is controlled at 1.5:1, and is rotated and dried Kiln, belt or plate fluidized bed dryer jet vortex hot air drying, then crushed by ultra-speed blade type, steel mill, ball mill pulverizer to form solid dry powder;

Then, add 10% ammonium sulfate, 14% urea, 10% monoammonium phosphate or double superphosphate, 6% calcium magnesium phosphate fertilizer, 10% potassium sulfate, 5% potassium chloride, and 0.5% borax (or boric acid), Conditioning agents such as 0.75% manganese sulfate, 0.05% ammonium molybdate and 5% attapulgite powder or zeolite powder;

Finally, it is stirred and mixed by a vertical mixer or a horizontal flap mixer, and then transported to a drum granulator, and the concentrated waste liquid with a pressure of 0.4-0.6mPa is used for spray drum granulation, and passed through a rotary drying kiln at 240-270 °C. It is air-dried at high temperature, cooled by cold air in the rotary cooler, and then the finished product is atomized and coated by spraying n-butyl stearate at a pressure of 0.4-0.8mPa in the wrapping machine, and finally sieved to make the product.

The invention can produce products containing nitrogen, phosphorus and potassium ≥ 25% (12-5-8), organic matter ≥ 20%, and trace elements ≥ 0.2%.

Example 6

Firstly, the waste liquor from wheatgrass pulping and papermaking is concentrated by hot pipe spraying or hot plate spraying, so that the solid content in the concentrated liquid reaches a concentration of 30%, and then the concentrated liquid is sent to the thermal insulation storage tank ;

Next, spray the concentrated liquid onto the peat organic matter powder with a diameter of 0.25-1 mm for granulation, the weight percentage of the concentrated liquid and the organic matter carrier is controlled at 2:1, and dry through a rotary drying kiln, a belt type or a plate type fluidized bed Machine jet vortex hot air drying, then crushed by ultra-speed blade, steel mill, ball mill pulverizer to form solid dry powder;

Then, add 5% ammonium sulfate, 20% ammonium nitrate, 12% monoammonium phosphate, 20% potassium sulfate, and 1.0% borax (or boric acid), 1.0% zinc sulfate, manganese sulfate, 0.02% ammonium molybdate and 5% Conditioning agents such as zeolite powder;

Finally, it is stirred and mixed by a vertical mixer or a horizontal flap mixer, and then transported to a drum granulator, and the concentrated waste liquid with a pressure of 0.4-0.6mPa is used for spray drum granulation, and passed through a rotary drying kiln at 240-270 °C. It is air-dried at high temperature, cooled by cold air in the rotary cooler, and then the finished product is atomized and coated by spraying n-butyl stearate at a pressure of 0.4-0.8mPa in the wrapping machine, and finally sieved to make the product.

The invention can produce products containing nitrogen, phosphorus and potassium ≥ 25% (10-5-10), organic matter 20% and trace elements ≥ 0.4%.

Example 7

Firstly, the waste liquid from wheatgrass pulping and papermaking is concentrated by hot pipe spraying or hot plate spraying, so that the solid content in the concentrated liquid reaches a concentration of 35%, and then the concentrated liquid is sent to the thermal insulation storage tank ;

Next, spray the concentrated solution onto peat with a diameter of 0.25-1mm and 50% of the mixed organic powder of fermented stalks for granulation. The weight percentage of the concentrated solution and the organic carrier is controlled at 1.5:1, and passed through a rotary drying kiln , belt-type or plate-type fluidized bed dryer spray vortex hot air drying, and then crush it with ultra-speed blade type, steel mill, ball mill pulverizer to form solid dry powder;

Then, add 10% ammonium sulfate, 8% urea, 12% superphosphate, 14% potassium sulfate and 0.5% borax (or boric acid), zinc sulfate, manganese sulfate, 0.02% ammonium molybdate and 6% attapulgite , 5% zeolite powder and other conditioners;

Finally, it is stirred and mixed by a vertical mixer or a horizontal flap mixer, and then transported to a drum granulator, and the concentrated waste liquid with a pressure of 0.4-0.6mPa is used for spray drum granulation, and passed through a rotary drying kiln at 240-270 °C. It is air-dried at high temperature, cooled by cold air in the rotary cooler, and then the finished product is atomized and coated by spraying n-butyl stearate at a pressure of 0.4-0.8mPa in the wrapping machine, and finally sieved to make the product.

The invention can produce products containing nitrogen, phosphorus and potassium ≥ 20% (8:5: 7), organic matter ≥ 20%, and trace elements ≥ 0.2%.

Example 8

Firstly, the waste liquid from wheatgrass pulping and papermaking is concentrated by hot pipe spraying or hot plate spraying, so that the solid content in the concentrated liquid reaches a concentration of 45%, and then the concentrated liquid is sent to the thermal insulation storage tank ;

Next, spray the concentrated solution onto the mixed organic powder of peat, weathered coal and fermented straw (5:3:2) with a diameter of 0.25-1 mm for granulation, and the weight percentage of the concentrated solution and the organic carrier is controlled at 1.5:1, Then it is dried by spraying vortex hot air in a rotary drying kiln, belt or plate fluidized bed dryer, and then crushed by an ultra-speed blade type, steel mill, or ball mill pulverizer to form a solid dry powder;

Then, add 10% ammonium sulfate, 10% urea, 12% superphosphate, 12% potassium sulfate and 0.5% borax (or boric acid), 0.5% zinc sulfate, magnesium sulfate, manganese sulfate, 0.05% ammonium molybdate and 5% attapulgite powder, 5% zeolite powder and other conditioning agents;

Finally, it is stirred and mixed by a vertical mixer or a horizontal flap mixer, and then transported to a drum granulator, and the concentrated waste liquid with a pressure of 0.4-0.6mPa is used for spray drum granulation, and passed through a rotary drying kiln at 240-270 °C. It is air-dried at high temperature, cooled by cold air in the rotary cooler, and then the finished product is atomized and coated by spraying n-butyl stearate at a pressure of 0.4-0.8mPa in the wrapping machine, and finally sieved to make the product.

The invention can produce products containing nitrogen, phosphorus and potassium ≥ 20% (9:5: 6), organic matter ≥ 20%, and trace elements ≥ 0.2%.

In the waste liquid of wheatgrass pulping and papermaking, in addition to containing plant nutrients, the organic part is mainly composed of lignosulfonic acid humus. Lignosulfonic acid is a good complexing agent, and the complexation with inorganic nutrients can improve The fertilizer effect is 1-2 times. In addition, lignosulfonate is also a new type, natural, high-efficiency and broad-spectrum plant growth regulator, which can enhance photosynthesis of crops, improve tillering ability, enhance the healing ability of plant wound parts, enhance stress resistance, regulate The metabolism of active oxygen stabilizes the plant cell membrane system, and has the functions of keeping green and delaying aging.

Therefore, using the plant nutrient elements and active organic substances in the pulp waste liquid, according to the principle of scientific and balanced fertilization, other nutrients are added according to the amount to make organic fertilizers that adapt to the characteristics of local soil fertility, nutrient supply and nutrient demand during the growth period of crops. Compound fertilizers can adapt to meet the needs of agricultural production, and at the same time, can effectively improve agricultural output and quality, protect the environment and improve soil fertility, and can become pollution-free clean fertilizers.

Claims (6)

1. A process for producing organic compound fertilizers from papermaking waste liquid, the papermaking waste liquid is wheat grass imonium pulping and papermaking waste liquid, and the process is a closed loop process technology, characterized in that it has the following process steps: First, the waste liquid is concentrated by pipe spraying and sent to the thermal insulation storage tank; Next, spray the concentrated solution onto an organic carrier for granulation, and dry and pulverize to form a solid dry powder; Then, add nitrogen, phosphorus, potassium, medium and micronutrient elements and conditioning agents; Finally, the product is made by mixing, spraying and granulating, drying and cooling, coating and sieving. 2. The process according to claim 1, characterized in that: the solid content in the concentrated solution is 30-50%, and the organic matter carrier is any one of peat, weathered coal, fermentation straw or any combination. 3. The process according to claim 2, characterized in that the organic carrier is a powder smaller than 1 mm. 4. The process as claimed in claim 1, 2 or 3, characterized in that the pulverization is super-speed blade pulverization. 5. The process according to claim 1, 2 or 3, characterized in that: said pulverization is closed negative pressure pulverization, said granulation is spray drum granulation, and said drying is jet vortex hot air drying. 6. The process according to claim 1, 2 or 3, characterized in that: said nitrogen is urea, ammonium nitrate, ammonium sulfate, and its addition amount is 5%-20%, and said phosphorus is monoammonium phosphate, heavy Superphosphate, calcium magnesium phosphate fertilizer, its addition amount is 5%-15%, described potassium is potassium sulfate, potassium chloride, its addition amount is 10%-20%, described medium and micronutrient element is magnesium sulfate, The addition amount of zinc sulfate, ferrous sulfate, manganese sulfate, and ammonium molybdate is 0.05%-1%, and the conditioner is attapulgite powder, zeolite powder, bitter earth powder, and its addition amount is 1%-8%. The crushing is closed negative pressure crushing, the granulation is spray drum granulation, and the drying is jet vortex hot air drying.