JPS61234334A - Automatic analysis of particurate manure - Google Patents

Abstract

PURPOSE:To enable fully automatic analysis with a quick processing, by finely crushing particulate manure under the atmosphere with the humidity of below 60% using an impact crusher to be dissolved in a solvent and then introduced into an automatic manure analyzer. CONSTITUTION:Particulate manure with the particle size of 1-4mm based on nitrogen, phosphoric acid or the like is finely crushed and the fine powder thus obtained is dissolved in a solvent to be introduced into an automatic manure analyzer such as auto-analyzer for analysis. Here, an impact crusher is used and it is such a type that particulate manure is made to bit a crushing chamber wall surface to crush by a centrifugal force with a high-speed rotary blade under the atmosphere with the humidity of below 60% and the fine crushing is done at 5,000-25,000rpm of the rotary blade. The manure crushed is dissolved in a solvent. Thus, uniform fine powder can be obtained in a short time while this method eliminates the biasing of components or the like thereby being incorporated into a fully automatic analysis process as one process.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a completely automated method for the analysis of granular fertilizers.

[Conventional technology]

The method for analyzing granular fertilizers involves pulverizing the granular fertilizers and dissolving them in a solvent using an automatic fertilizer analyzer, which is not a complete automatic analysis method.

In addition, as a method that does not require the pulverization of granular fertilizers, a method has been proposed in which granular fertilizers are directly dissolved in a solvent and introduced into an automatic fertilizer analyzer. There are inconveniences such as a long time and a long time required, and especially when lumpy, poorly soluble components are mixed in the granular fertilizer, it is not easy to dissolve them and complete automatic analysis is difficult.

[Problem that the invention seeks to solve]

The present inventors conducted a study considering that uniform pulverization of granular fertilizers is essential in order to perform fully automatic analysis of granular fertilizers.

This fine pulverization is: ■ It is a step in fully automatic analysis υ, so it can be done quickly to keep up with other steps, and ■ No separation of components occurs during the division and weighing of the pulverized powder. So that there is no
All of the components must be uniformly ground to the desired particle size; ■ The powder must be as finely ground as possible so that it dissolves quickly in the solvent; ■ There should be no mixing with the next sample to be analyzed. It is required that no powder remains in the pulverizer after pulverization is complete.

The inventors of the present invention have conducted extensive research in order to meet the above requirements, and have found that when pulverization is carried out using a specific pulverizer under specific conditions, it is possible to uniformly pulverize granular fertilizer. The present invention was completed by confirming that the sample can be easily dissolved in a solvent without the need for heating, and that a fully automatic analysis can be performed by combining this with conventionally known automatic analysis operations.

[Means for solving problems]

The purpose of the present invention is to completely automatically analyze granular fertilizers.The purpose of the present invention is to pulverize granular fertilizers using an impact pulverizer in an atmosphere with a humidity of 60% or less, and to use the resulting fine powder in a solvent. This is achieved by dissolving and introducing into a fertilizer automatic analyzer.

The present invention will be explained in more detail below.

The granular fertilizer targeted by the present invention is a fertilizer based on the Fertilizer Control Law and is in the form of granules or lumps with a particle size of 44 ml. In terms of fertilizer ingredients, nitrogen fertilizer, phosphate fertilizer,
Examples include potassium fertilizer, first-class compound fertilizer, calcareous fertilizer, silicic acid fertilizer, magnesium fertilizer, manganese fertilizer, porous fertilizer, and trace element compound fertilizer. Natural products can also be targeted.

The impact crusher is preferably an impact crusher that has a rotor such as a rotor, an impact plate, or an impact column that rotates at high speed, and crushes the crushed fertilizer by colliding it against the wall surface of the crushing chamber using centrifugal force.

What is the rotation speed of the rotor blade? r,000~2! r, 000 r
pm, preferably to, ooo to 0,000 rp
It is ra. If the rotational speed is too low, sufficient pulverization will not be possible.

Furthermore, there is no particular need to increase the rotational speed any further.

The pulverized powder is transported by the airflow generated inside the pulverizing chamber.
It is best to take it out through a screen. The particle size of the resulting powder can be determined by selectively using screens of various openings.

The pulverization of granular fertilizer in the present invention is carried out at a humidity of 60% or less,
Preferably! ! It is best to do this at less than 1. If the humidity is too high, the pulverized powder will adhere to the walls of the pulverizing chamber, making it impossible to pulverize sufficiently, and also making it difficult to discharge the powder, making it impossible to continue stable pulverization. Although there is no particular disadvantage to lowering the humidity, it is economically disadvantageous.

Humidity can be easily adjusted using an air conditioner, but
In some cases, the purpose can be achieved simply by introducing air cooled to a temperature slightly lower than room temperature.

The particle size of the powder obtained by pulverization may be determined depending on the solubility of the sample powder in the solvent, but in the case of easily soluble powder, o
, r■ or less, preferably O, ko or less, O in the case of poorly soluble
0-- or less, preferably Q, 7a or less. Note that the particle size mentioned here does not mean the particle size of all fine powders after pulverization, but the approximate size of the fine powder.
% has a particle size of this size.

The time is 75-60 seconds.

In this way, when the residual powder is discharged, the next granular fertilizer to be tested can be ground.

The powder obtained by pulverization can be prepared by a known method, for example, by
According to the method described in i-axstr, it may be dissolved in a solvent, and the resulting solution may be suction-filtered and introduced into an automatic fertilizer analyzer for analysis.

〔Example〕

EXAMPLES The present invention will be specifically explained below with reference to examples, but the present invention is not limited to the following nine examples as long as the gist of the invention is not exceeded.

Examples/~6 and Comparative Example 1 - The internal volume of the crushing chamber is 200-, the blade diameter/JcrIK, and the number of blades in g.
Using an impact crusher with two rotary blades and a screen, granules of ammonium phosphorus sulfide fertilizer containing urea with a particle size of 1 to 2 were sampled. Grinding was carried out at 7 times of loading amount and humidity n].

The results are shown in Table 7 below.

For comparison, the internal volume/l,! The results are also shown when the above sample was pulverized at t and ooP 7 times using a rotary hammer type pulverizer having 6 of/of mallets.

As can be seen from Table 1 above, when using the method of the present invention, it is possible to reduce coarse particles of Q, j;
By dry running for 0 seconds, the amount of residue can be reduced to a level that has no substantial effect on the next analysis.

On the other hand, in the comparative example, it took a long time to grind,
Moreover, the crushed material stuck between the crushing section and the discharge section, and a large amount of residue remained even after idle rotation, so cleaning was required every time.

The pulverized sample obtained by pulverization as described above was prepared using an automated sample weighing, dissolving, and filtration device and an automatic analyzer. Add Q, 4CN-HCI Hiro 00- to the mixture, shake for 30 minutes using a shaker with a rotation speed of 30 to 200 rpm for 1 minute, add water up to the marked line, filter through dry F paper, and use a fertilizer analysis official method. Principal component analysis was performed.

The pulverized samples of Example 1, Example 1, Comparative Example 1, and Comparative Example 1 were analyzed three times, respectively.The average (X
) and deflection width (R) are shown in Table 2 below.

It can be seen from Table 1 above that there is no difference in the analytical results between the method of the present invention and the conventional method.

〔effect〕

The present invention involves pulverizing the granular compound fertilizer by a specific means, so that the granular compound fertilizer can be pulverized in a short time, the resulting powder is uniform and fine, there are no disadvantages such as fragmentation of ingredients, and it dissolves well in the solvent. Therefore, it becomes possible to perform completely automatic analysis, and the industrial value is extremely large.

Applicant: Mitsubishi Chemical Industries, Ltd. Agent Patent attorney required - 1 other person

Claims (3)

[Claims] (1) Granular fertilizer is produced by pulverizing the granular fertilizer using an impact pulverizer in an atmosphere with a humidity of 60% or less, dissolving the resulting fine powder in a solvent, and introducing it into an automatic fertilizer analyzer. Automated analysis method. (2) The impact crusher has a rotation speed of 5,000 to 25,000 r.
The automatic analysis method for granular fertilizer according to claim (1), which is an impact crusher having rotary blades of pm. (3) After pulverizing one type of granular fertilizer, the impact pulverizer is idly rotated for at least 10 seconds to discharge the residual powder inside the pulverizer.
Automated analysis method for granular fertilizers described in Section 1.