Calcium magnesium phosphate fertilizer is insoluble in water, non-toxic, non-corrosive, non-hygroscopic, non-caking, chemically alkaline fertilizer. It is widely used in various crops and acidic soils deficient in phosphorus, especially suitable for acid red loam where calcium and magnesium are leached in the south. Calcium magnesium phosphate is a gray-green or gray-brown powder with a phosphorus content of 8% to 14%. It also contains magnesium and a small amount of silicon. Silicon can promote the growth of crop fiber tissue, so that plants have better prevention of lodging and pests. ability. It is very effective as a base fertilizer when cultivating large seedlings, and plants can slowly absorb the required nutrients.
Characteristics of calcium magnesium phosphate fertilizer
1, the most suitable for deep application of base fertilizer. After the calcium magnesium phosphate fertilizer is applied to the soil, the phosphorus can only be dissolved by the weak acid, and after a certain transformation process, it can be used by the crop, so the fertilizer efficiency is slow, and it is a slow-acting fertilizer. Generally, it should be combined with deep tillage, and the fertilizer should be evenly applied to the soil to mix it with the soil layer to facilitate the dissolution of the soil acid and facilitate the absorption of the crop.
2. The southern paddy field can be used to dip the roots. The dosage per mu is about 10 kg, no harm to the seedlings, and the effect is better.
3, mixed with more than 10 times of high-quality organic fertilizer for more than 1 month, good fertilizer can be used as base fertilizer, seed fertilizer, can also be used to dip roots.
Calcium magnesium phosphate fertilizer use precautions
- Calcium, magnesium and phosphorus fertilizers are better combined with calcium and nitrogen fertilizers, but they cannot be mixed with them.
- Calcium, magnesium and phosphate fertilizers are usually not mixed with acidic fertilizers, otherwise the effect of the fertilizer will be reduced.
- The dosage of calcium magnesium phosphate should be appropriate. Generally, the dosage per acre should be controlled between 15 and 25 kg. Excessive application of calcium magnesium phosphate fertilizer will not only increase the fertilizer efficiency but also cause the problem of diminishing returns. Usually, when applying calcium and magnesium phosphate in 35 to 40 kg, it can be applied every other year.
- Calcium, magnesium and phosphorus fertilizers are most suitable for crops that have strong absorption capacity for lysible phosphorus, such as rapeseed, radish, legume green manure, legumes and melons.
- In the identification of the package identification, the product name, trademark, nutrient and its content, net weight, implementation standard number, production license number, factory name, factory address, telephone number, etc., should be on the package, and the printing should be regular and clear.
- In the identification of odor and water solubility, calcium magnesium phosphate has no odor and is insoluble in water.
- In the color and shape identification, calcium, magnesium and phosphorus fertilizers are mostly grayish white, light green, dark green and black brown, etc., which are powdery.
- In the hand-feel recognition, it can be seen that calcium, magnesium and phosphorus fertilizers are 枸-soluble phosphate fertilizers, soluble in weak acid, alkaline, and non-corrosive by hand without moisture absorption and no agglomeration.
In the industrial production of calcium, magnesium and phosphate fertilizers in China, the blast furnace method is mainly used for production. Because the blast furnace method has simple equipment, the investment is fast, and the existing ironmaking blast furnace or iron furnace can be used for production. At the same time, the blast furnace method is easy to operate, and it is easy to bloom everywhere.
There are many types of phosphate rock equipment used in phosphate rock mining, such as phosphate rock crushers, which are more commonly used. Therefore, the blast furnace method has developed more in China. However, the blast furnace method requires lump, lump coal, and coke. For the use of fine ore and pulverized coal, it should be considered to use a method of sintering agglomerates.
Production process of calcium magnesium phosphate blast furnace method
Phosphate ore, silico-magnesium minerals and coke are crushed to a certain size (generally 10 to 100 mm), and after sieving off the granules, they are matched according to a certain ratio, and they are fed to the top of the blast furnace 2 by the hoisting machine 1. The feed bell 3 is automatically dropped into the furnace. Hot air (hot air) from the hot blast stove 6 is sprayed into the blast furnace through the tuyere 4. The hot air meets the coke added to the furnace and rapidly burns to generate high temperatures.
At this time, the temperature in the high temperature zone of the furnace can be as high as 1450-1500 ° C, and the generated high temperature gas meets the charge, and the charge is gradually melted. After being fully melted and superheated in the furnace, the calcium magnesium phosphate fertilizer melt is discharged from the discharge port; at the same time, a small amount of Ni in the U ore and the serpentine (or silicon magnesium nickel ore) are combined into nickel phosphorus iron. It sinks into the bottom of the furnace, exits from the ferronickel outlet, introduces it into a nickel-phosphorus iron mold, solidifies it, and further processes it into metallic nickel.
The calcium magnesium phosphate fertilizer melt discharged from the mountain material port is sprayed with a pressure of 2-4 atmospheres of water, so that it is water-quenched into fine particles flowing into the water quenching tank, and the wet particles are sent to the hopper by a drain type hoist. Then, the hopper is sent to the rotary drying oven for drying, and the dried semi-finished product generally has a moisture content of about 0.5%. The bucket is sent to the ball mill for grinding through the bucket elevator, and the fine powder produced when the material is dried. It is drawn into the cyclone by the pumping force of the exhaust fan.
Here, the collected fine powder and the dried semi-finished product also enter the ball mill, the ball powder good powder material and the dust collected by the cyclone separator and the bag filter are all finished products and can be sent out for packaging. In the blast furnace, the blast furnace exhaust gas generated by coke combustion is discharged from the top of the furnace, and contains about 15% of carbon monoxide, which can be sent back to the hot blast stove for combustion gas after the dust is removed.
In the blast furnace, the fluoride contained in the phosphate rock will also react with water vapor to generate a small amount of hydrogen fluoride and silicon tetrafluoride gas. When the furnace gas is discharged into the atmosphere, it will pollute the environment to varying degrees, endangering humans and animals, and damaging plants. Therefore, in order to remove the fluorine-containing gas in the exhaust gas, it may be removed by a method such as washing with water, lime water or ammonia water.
The fluorine-containing gas can corrode the steel, so the temperature of the furnace gas coming out from the top of the furnace is generally controlled between 150-200 °C, so that the water vapor in the furnace gas is not condensed, so as to prevent the fluorine-containing gas from being dissolved in the condensed water and intensifying the furnace body. Corrosion of pipes.
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