JPS6018631B2 - silicic acid fertilizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a poppy and acidic fertilizer containing phosphoric acid.

Conventionally, poppy and acid fertilizers that meet the standards stipulated by the Fertilizer Control Law have been commercially available.

The poppy and acid fertilizers stipulated in this standard are used to neutralize the poppy, acid content, and acidity of the soil, and these are all three elements of fertilizer. Nitrogen, phosphoric acid, and potassium are not included. These poppy seeds and acid fertilizers are obtained by crushing ore produced in the smelting of metals and non-ferrous metals, or in the phosphorus manufacturing industry, and the ingredients they should contain are as described above. It is defined as the minimum amount% of the main components that should be included in the specifications,
Regarding the grain size, a 2000 micron steel section is passed through, and 5
It is determined that 60% or more of the light passes through 90 microns.

The specifications for this fertilizer component are shown in Table 1.

Table 1 However, despite these standards, only a small amount of these by-products are used as fertilizers, and their use is desired.

On the other hand, phosphoric acid solution cannot be used directly as a fertilizer due to its strong acidity, so there are other ways to use it, such as neutralizing it with ammonia to make ammonium phosphate fertilizer, or using it as heavy superphosphate lime or mixed phosphorus fertilizer. There wasn't.

In addition, there are eight types of phosphoric acid fertilizers, which are known as poppy and acidic fertilizers, according to the name and manufacturing method as standards stipulated in the Fertilizer Control Law. There are no fertilizers other than those listed in Table 2 that have the same or greater effect. 2. In addition to the standard, there is a mixture of phosphorus containing lime and bitter minerals, condensed phosphorus, and a mixture of phosphorus and phosphoric acid solution.

These fused phosphorus fertilizers, phosphorous phosphorus fertilizers, and winged phosphorus all consume a large amount of energy in the production process, and their costs have gradually increased due to the recent rise in energy prices.

The present inventor focused on these facts and conducted research on a new phosphoric acid fertilizer that combines acid fertilizer and phosphoric acid solution, and a method for producing the same, and as a result, the present invention was achieved. .

The present invention solves these drawbacks by producing a new poppy and acidic fertilizer from Renai acidic fertilizer and phosphoric acid solution, thereby making it possible to effectively utilize poppy and acidic fertilizers that have not been used in the past, and to use them as they are. The purpose of the present invention is to provide a method for easily converting unusable phosphoric acid solution into poppy acid fertilizer containing phosphoric acid without resorting to complicated treatment methods.

That is, in the present invention, the phosphoric acid content is 10 to 5 as P2Q.
It is a powdered poppy and acidic fertilizer containing 0% by weight, and its particle size is 2000 microns throughout, and more than 590 microns passes through the nodes 6 by weight.

The fertilizer of the present invention is mined so that the phosphoric acid content is 10 to 50% by weight as P205, and the particle size obtained by adding a phosphoric acid solution is 2000 micron particles, and 590 micron particles 6. Powdered poppy, which passes more than % by weight, is an acidic fertilizer.

The poppy acid fertilizer of the present invention contains a large amount of phosphoric acid compared to conventional ones, so it can be used as a simple fertilizer or as a raw material for compound fertilizers and mixed fertilizers, and it can also be used as a raw material for compound fertilizers and mixed fertilizers. Effective use of sashimi, low energy consumption,
It has more advantages.

Next, the manufacturing method will be explained. As mentioned above, most of the poppies and acid fertilizer used in the present invention are metals,
The use of poppy seeds made from by-products of non-ferrous metal factories and acid fertilizer standards is not limited to this, and the products manufactured by the method of the present invention comply with the standards of the Fertilizer Control Law. It is fine as long as it becomes something useful. A commercially available phosphoric acid solution is used, but the commercially available phosphoric acid solution is usually about 70% by weight as horse P04, and in the present invention, this is diluted with water and used as an acid fertilizer. It is added according to the alkaline content, and 1 is added as P205 to the poppy and acid fertilizer.
The content should be 0 to 50% by weight.

The reason for this is that if a substance outside this range is used, the phosphoric acid content added to the fertilizer cannot be used effectively, and the produced product cannot be used as a fertilizer.

In the present invention, poppies, acid fertilizer and phosphoric acid solution are mixed,
After sufficient reaction, the resulting product is crushed, dried, pulverized, or other suitable means to make it conform to fertilizer standards.

The reaction mechanism is thought to be as follows. When poppy/acidic fertilizer and phosphoric acid solution are mixed, the alkaline content starts a neutralization reaction with P04, generates heat, and reduces P07 to water-soluble monocalcium phosphate C.
a (Japanese 2P04)2 and water-insoluble but 2% citric acid soluble (<soluble) dicalcium phosphate Ca2HP04, tricalcium phosphate Ca3 (P04)2, etc. gradually.

In this case, the phosphoric acid content in the phosphoric acid solution to be added is 1 as P2Q.
The reduction reaction of the phosphoric acid, which is less than 0%, progresses too much, and not only does the hydrolyzed phosphoric acid content disappear, but also the phosphoric acid content in an insoluble, inactive state increases, which is undesirable. On the other hand, when P2Q exceeds 50%, unreacted phosphoric acid increases, and the product becomes strongly acidic and hygroscopic, making it unusable as fertilizer. Reference Example: In the method of the present invention, the amount of phosphoric acid solution added to poppy and acid fertilizers depends on the amount of phosphoric acid contained in the phosphoric acid solution and the desired fertilizer components, but usually, poppy and acid fertilizers are added. Theoretically, 13.
It is sufficient to add 8 to 6% by weight, but it is difficult to specify because it varies depending on the composition of the acidic fertilizer, the quality of the phosphoric acid solution, etc.

Specifically, pot oaks, tin sashimi produced by adding at least an amount of phosphoric acid that neutralizes the alkaline content of the powder, and P in the powder.
What is necessary is just to make it contain 10-50 weight% of 205 minutes.

The present invention will be explained below with reference to Examples.

Example 1 Guaranteed ingredients Soluble poppy, acid 30.0, alkaline content 40.0
,〈Takeshi, acid fertilizer (Silical) manufactured by crushing soluble bitter 1.0 steel slag 685 evening to day 3P04 minute 53
A phosphoric acid solution of 546% was added thereto, mixed, crushed, dried, and then crushed again to obtain lk9, which passed completely through a 2000 micron node and 60% or more passed through a 590 micron node.

The analytical values were as follows. 2.5% water, 20.7% soluble phosphoric acid, 6.5% soluble phosphoric acid, 20.2% soluble poppy, acid 1.2%. Example 2 When the same treatment as in Example 1 was carried out by adding 840% phosphoric acid solution of 3P04 and 61% as in Example 1, the water content was 2.8%, soluble phosphoric acid was 36.4%, and water soluble. phosphoric acid 24
．． A product of 8% soluble poppy and 13.5% acid was obtained.

In a porcelain beaker of Reference Example 300, Nippon Kical powder (Si02 32.76%, Ca0 42.2
7%, Mg07.69%), and add a phosphoric acid solution (76% product as 3P04, adjusted with water) at a specified concentration to form a slurry for 1 hour in a hot bath at a temperature of 800°. Made it react.

This was dried and analyzed. These conditions and results are shown in the table. Table According to the present invention, by adding a phosphoric acid solution to the poppy and acid solubility of the poppy/acid fertilizer, the fertilizer is made to dissolve more than pseudo% in a 2% citric acid solution. Even when used in soil with a high pH, it is more easily decomposed than conventional poppy or acidic fertilizers and exhibits excellent fertilizer effects.

Claims (1)

[Claims] 1. A powdered silicic acid fertilizer containing 10 to 50% by weight of phosphoric acid as P_2O_5 and having a particle size that passes through a 2000 micron sieve and 60% by weight or more of a 560 micron sieve.