KR20000020548A - Manufacturing method of powdery silicate fertilizer not being hardened - Google Patents

Abstract

PURPOSE: Provided is the manufacturing method of powdery silicate fertilizer not being hardened which solves the problem, that the caking property and the hydraulic property of slag minute powder are increasing as its size is decreasing, by the first grinding, the ageing, and the second grinding of the slag. CONSTITUTION: After the first grinding of the slag, its ageing for the suitable period results in the hardening of the slag because the main component of the slag, CaO reacts with moisture in the air or water and the slag is hydraulic. The second grinding of the hydraulic slag prevents the slag from being hardened for the long time. In the first grinding process, the blast furnace slag is grinded into less than 3 mm for the granulated blast furnace slag and less than 100 mm for the ground blast furnace slag. The grinded slag is aged for 2 days - 2 months until it is hardened. In the second grinding process, the hardened slag is grinded into less than 3 plus or minus 1 mm. To generate the silicate fertilizer, 20-95% of particles (0-0.15 mm) and 40-20% of particles (0.15-0.5 mm) are removed, and 0-7% of water is added.

Description

Method for manufacturing powdery siliceous fertilizer that does not harden

The present invention relates to a method for producing a powdery siliceous fertilizer that does not harden. More specifically, the finely divided slag powder exhibits more cohesiveness and hydrophobicity as it is finely divided. When the particles are entangled and hardened by using the hydraulic property, they are crushed again, ie, the crushing process. CaO in the slag reacts with moisture or water in the air and shows a hydration reaction with Ca (OH) ₂. If the fine powder is removed and packaged again in the second crushing process, it does not harden even after long-term preservation, and the high fine powder is removed when it is sprayed into the soil, so there is no loss rate and it is not a granulation product using a caking agent. Silicate fertilizer of powder state to be able to do It relates to a method.

Generally, a large amount of slag is generated in the process of smelting iron through iron ore or scrap metal in a steel mill, and the slag generated in a large amount is chemical as shown in Table 1 below. As it has a component, it is recycled to various fields as shown in Table 2.

Table 1 Chemical Composition Analysis Table by Type

Class Ingredient SiO₂ CaO Al ₂ O₃ T-Fe MgO MnO S TiO₂ Blast furnace slag 33.5 41.8 13.6 0.4 6.4 0.5 One 1.3 Converter slag 14.8 46.1 1.5 16.4 6.3 5.4 0.08 1.5

* Including FeO, Fe ₂ O _3, etc.

(Table 2) Main uses of blast furnace slag

Slow cooling slag Road auxiliary base material, coarse aggregate for concrete, port material, siliceous fertilizer, slag wool Quenching slag Blast Furnace Cement Raw Material, Soil Enhancer, Ascon Aggregate, Silicate Fertilizer etc.

The slag that is recycled in various fields while having the chemical composition as described above is generated in a small amount in a converter or an electric furnace, and a large amount is generated in the blast furnace slag. The present invention mainly deals with blast furnace slag, but the slag produced in a converter or an electric furnace is also of the present invention. Included in use and production purposes.

The method for producing powdered siliceous fertilizer using slug and slag from the use as a siliceous fertilizer until now is crushed into pulverized blast furnace slag into fine powder using a grinder and supplied to farmers who need them in vinyl or bags to meet specifications and weight. Doing.

The siliceous fertilizers supplied to the farmers are fine powders themselves, so they can be blown well even in mild winds, and have a loss rate of about 20%. Since it hardens completely (the reason is due to CaO of the ingredients), there was always a problem, such as being unable to use and faced away from consumers.

So, to solve this problem, granular siliceous fertilizer came out. The granular siliceous fertilizer does not fly well in the wind and it does not take up much moisture even after loading, but it overcomes the above problems to some extent, but in order to manufacture the siliceous fine powder as a chemical seasoning Since about 7-15% of waste or other caking additives need to be added, the physical properties are lowered and the price is much higher, which imposes a considerable burden on the purchasing farmers, and when it is crushed during transportation, fine powder is also generated. Problems such as blowing in the wind when siliceous fertilizer is sprayed on the soil.

The present invention has been made in order to solve the above problems, the finer the slag powder, the finer the nature, the greater the cohesiveness and the hydrophobicity, so in the first crushing process by removing the screen as much as possible by attaching a screen or the like in the first crushing slag while ripening in the yard When the particles are entangled and hardened by using the hydraulic property of their own, and then crushed again, the crushing process is carried out. If the fine powder is removed and packed again in the second crushing process, it does not harden even after long-term preservation.There is no loss rate because the fine powder is removed when spraying on the soil, and it is not a granulation product using a caking agent. The purpose of which is to .

In order to achieve the above object, the blast furnace slag is firstly crushed to 3 mm or less in the case of a handmade material and 100 mm or less in the case of a stiffener,

Curing the crushed slag by aging for 2 days to 2 months for a certain period of time,

The hardened slag was again crushed again, and both the wood and the aggregate were pulverized to 3 ± 1 mm or less to remove 20 to 95% of the 0 to 0.15 mm particles belonging to the fine powder, and the particles of 0.15 mm to 0.5 mm were about 40 to 20%. It is to provide a supply to those in need of siliceous fertilizer by removing and packaging with 0-7% water added.

1 is a process diagram of the present invention

Referring to the configuration and operation of the present invention in detail based on the accompanying drawings as follows.

1 illustrates a process diagram of the present invention.

Blast furnace slag is made of 3 mm or less in the case of handmade materials and 100 mm or less in the case of masonry materials,

Aging the crushed slag for 2 days to 2 months for a certain period of time, and hydrocuring;

The hydrocured slag was again crushed again, and both the lumber and the aggregate were pulverized to 3 ± 1 mm or less to remove 20 to 95% of the 0 to 0.15 mm particles belonging to the fine powder, and the particles of 0.15 mm to 0.5 mm were about 40 to 20 mm. It consists of producing siliceous fertilizer by removing% and adding 0-7% moisture.

The operation of the present invention is as follows.

The finer the slag powder, the finer the nature, the greater the cohesiveness and the hydraulic property. Therefore, the primary crushing process is primarily crushed to 3 mm or less in the case of the handicraft and 100 mm or less in the case of the aggregate.

After removing as much of the fine powder generated in the shredding process as possible, it is aged for two to two months in the yard and the particles become entangled with each other.

The particles are entangled with each other and CaO is the main component of the slag reacts with moisture or water in the air to hydrate with Ca (OH) ₂ to cure the water.

Once the fine powders are entangled with each other and become hardened, they are re-crushed and then removed from the fine powder produced in the shredding process and packed with 0 to 7% moisture.

Therefore, in the present invention, after first crushing slag, the fine powder is removed, aged, and then hardened, and then re-crushed to remove fine powder, and then added to the particle size to add 0 to 7% of moisture to be packaged for long-term conservation. It is a very useful invention in the manufacture of siliceous fertilizers that can not be hardened and can be priced at a low price because it has no loss rate and is not a granulation product using a caking agent when removing the fine powder when sprinkling.

Claims (1)

Blast furnace slag is made of 3 mm or less in the case of handmade materials and 100 mm or less in the case of masonry materials, Aging the crushed slag for 2 days to 2 months for a certain period of time, and hydrocuring; The hydrocured slag was again crushed again, and both the lumber and the aggregate were pulverized to 3 ± 1 mm or less to remove 20 to 95% of the 0 to 0.15 mm particles belonging to the fine powder, and the particles of 0.15 mm to 0.5 mm were about 40 to 20 mm. A method for producing a powdery siliceous fertilizer, which is characterized in that the composition is prepared by removing the% and adding 0 to 7% of water to produce a siliceous fertilizer.