KR100383074B1 - Production method for coarse calcareous manure using waste lime - Google Patents

Abstract

The present invention relates to a method for producing granulated fertilizer using waste lime, and more particularly, to prepare granulated calcified fertilizer by properly treating waste lime generated as a by-product in the sodium carbonate (Na ₂ CO ₃ ) manufacturing process. It is about a method.

Thus, the method for producing coarse lime fertilizer using the waste lime of the present invention comprises a washing step of washing the waste lime 100, which is a waste generated in the workplace using the washing machine 110;

A sieve separation process of separating the washed waste lime into the product 130 and the contaminant 200 using the sieve separator 120;

Precipitation separation process for precipitating and separating the sieve separated product 130 to concentrate first;

A dewatering process of recovering the lime fertilizer 160 by dehydrating the first concentrated waste lime with a vacuum dehydrator 150;

An assembly manufacturing process of adding the lime fertilizer 160 to the assembly manufacturing unit 170 to produce a product having a predetermined size, shape, and moisture; And

Drying the granulated calcined fertilizer 190, which is a final product containing 10-15% moisture by injecting the product produced through the granulator 170 into the dryer 180;

Characterized in that consists of.

Description

Production method of coarse lime fertilizer using waste lime {PRODUCTION METHOD FOR COARSE CALCAREOUS MANURE USING WASTE LIME}

The present invention relates to a method for producing granulated calcareous fertilizer by appropriately treating waste lime generated as a by-product in various workplaces, in particular, sodium carbonate (Na ₂ CO ₃ ) manufacturing process.

As is well known to those skilled in the art, sodium carbonate (Na ₂ CO ₃ ) can be prepared by reacting sodium chloride (NaCl) in seawater with carbon dioxide (CO ₂ ) obtained by calcining the mineral lime (CaCO _3, calcium carbonate). Can be reacted at this time

2NaCl + CaCO ₃ + H ₂ O → Na ₂ CO ₃ + CaCl ₂ + H ₂ O

or

2NaCl + 2NH ₄ OH + CO ₂ → Na ₂ CO ₃ + 2NH ₄ Cl + H ₂ O

Also limestone (CaCO ₃ ) is reacted as follows.

CaCO ₃ → CaO + CO ₂

In this process, by reaction of NH ₄ Cl, CaO, etc. generated as by-products

2NH ₄ Cl + CaO + H ₂ O → 2NH ₃ + CaCl ₂ + 2H ₂ O

Various by-products are formed, such as CaCO ₃ → CaO + CO ₂ .

The by-products generated at this time are produced by the reaction of water with unreacted sodium chloride (NaCl), uncalcined limestone (CaCO ₃ ), calcined limestone (CaO) produced by heating calcined limestone, and the quicklime with water. Calcined lime (Ca (OH) ₂ ), calcium chloride (CaCl ₂ ) and other compounds can be formed.

In order to analyze the composition of the chemical composition of the waste and to examine its applicability to using the chemical component in order to construct a method that can be utilized as a useful resource by appropriately treating such waste, the chemicals of the waste lime generated in the workplace are usually used. As a result of investigating the components, it can be seen that most of them are composed of inorganic materials as shown in the following <Table 1>. Especially, even in the case of dehydration treatment, the water content is 40% because the inorganic particles are very small. .

Table 1

Chemical Composition of Waste Lime

Chemical composition Composition (wt%) Remarks CaCO ₃ 24.1 Produced by not firing in the calcining stage of limestone, and quicklime formed by reaction with carbon dioxide CaO 10.9 Formed by calcining limestone, mostly lime MgO 4.6 Contained in limestone and seawater CaCl ₂ 5.8 Formed by reaction CaSO ₄ 3.5 Formed by reaction Fe ₂ O ₃ 1.2 Incorporation from raw materials such as limestone Al ₂ O ₃ 2.3 Incorporation from raw materials such as limestone NaCl 3.6 Presence of mixed and unreacted substances in sea water SiO ₂ 4.0 Incorporation from raw materials such as limestone moisture 40.0 Dehydrated but remaining after reaction

Among these chemical components, such as sodium chloride (NaCl), calcium chloride (CaCl ₂ ) components have a very bad effect on the crops, it is necessary to remove them completely if you want to use for fertilizers of the crop.

Different types of fertilizers are used depending on the crops to nourish the plants or to help cultivate the plant. Among them, lime fertilizer is cheaper than other fertilizers. It is lowered and the seeds are also unsatisfactory, so it is widely used for high-cultivation and vegetable cultivation.

Lime has been recorded for the first time in Greek agriculture, and it has been established as a common sense of agriculture in European societies that inherited the technology. Lime is combined with the three elements of fertilizer, nitrogen (N), phosphoric acid (P), and potassium (K). Also, lime is referred to as four element of fertilizer. It is also called a large element because it is absorbed by crops with Goto. have.

Calcite fertilizer was first defined in May 1950 in Japan, and was designated as a landfill cultivation material in May 1953, but was treated as a soil improvement material in May 1984. It is not included in the soil improvement materials, but is referred to as an earthwork fertilizer material together with inorganic phosphate fertilizer, koto fertilizer and siliceous fertilizer, and has established the process standard in the fertilizer regulation law. In some cases, due to acid rain, all soils such as agricultural soils and forest soils tend to be acidified, so the government recommends the use of alkaline lime fertilizer as a basic fertilizer and supports a part of the cost for the purchase of agricultural lime fertilizer. For forest soils that are not agricultural lands, there is no use of these neutralizing fertilizers. It becomes.

In the case of agricultural calcareous fertilizers in Korea, many kinds of fertilizers such as quicklime, fertilizer, limestone, fossil fertilizer, Busan lime and fertilizer are specified. It is the same, it is also an object of the present invention to purify the waste lime to produce a fertilizer having a quality in accordance with the provisions of Table 2.

Table 2

Types and specifications of calcareous fertilizer

The waste-related law of our country for such waste lime is classified as workplace waste and prescribed by the business owner to process it by itself, or to entrust it to a waste treatment company, a recycling treatment company or a company that installs and operates a waste treatment facility. However, as these by-products are not being properly disposed, more than 3 million tons of wastes are left at this time, and more than 100,000 tons of wastes are generated every year. Should be.

Until now, in order to utilize such waste lime properly, lightweight building materials using waste lime according to Korean Patent Application No. 1997-0052642, building materials composition using waste lime according to Korean Patent Application No. 2000-0008258 and manufacturing method It suggests or attempts to suggest the use of sidewalk blocks, bricks, road foundations, landfills as landfills, and some of them have been implemented, but they are completely different from the present invention, and also the coal ash of Korean Patent Application No. 1997-0052335 Organic and inorganic compound fertilizers and their manufacturing method, or soil fertilizer for fertilization by using steelworks by-products of the Republic of Korea Patent Application No. 1996-067563, but the content is different from the manufacturing technology of granulated fertilizers like the present invention Therefore, the manufacturing method of the coarse lime fertilizer of the present invention is not yet developed new .

The present invention has been made to solve the conventional problems as described above, the main object of the present invention is to satisfy the conditions and conditions available through the 100% separation and sorting of waste lime generated as a by-product of industrial processes To provide a method for producing a granulated calcareous fertilizer product.

Another object of the present invention is to prevent the pollution of the natural environment by converting and utilizing waste lime for other uses.

Another object of the present invention is to improve the resource efficiency through the recycling of resources by utilizing waste lime converted to other uses, such as civil engineering, building materials.

Still another object of the present invention is to provide a method capable of mass processing and minimizing treatment costs for waste lime waste which is left in the workplace and is present in large quantities.

Another object of the present invention is to mix the livestock manure and the like to absorb the water of the manure and use it as a fertilizer.

1 is an overall process diagram showing a method for producing granulated calcite fertilizer using waste lime of the present invention.

<Explanation of symbols for the main parts of the drawings>

100 Waste Lime 110 Washing Machine

120 product 130 screen

140 Sedimentation and Separation Tank 150 Dehydrator

160 Lime Fertilizer 170 Assembly Machine

180 Dryer 190 Granulated Fertilizer

200 Miscellaneous 210 Granulator

In order to achieve the above object, the method for producing coarse lime fertilizer using the waste lime of the present invention, as shown in the accompanying drawings, Figure 1, the waste lime 100, which is a waste generated in the workplace washing machine 110 Washing process to remove chloride which is a soluble component in water by using; and a sieve separation process for separating the product 130 and the contaminant 200 using a sieve separator 120 having a predetermined size of the washed waste lime Precipitating separation process to precipitate and separate the separated product 130 and the sieve through the sedimentation separation tank 140 to concentrate primarily; and dehydrated the first concentrated waste lime with a vacuum dehydrator (150) ) Dehydration process to recover the; and the granulation fertilizer 160 is put into the assembly manufacturing unit 170 to make a product having a certain size, shape and moisture; and the product produced through the assembly manufacturing unit 170 dryer Put into 180 final It characterized by consisting of; pumin calcareous fertilizer assembly 190 is that the drying step so that it contains 10 to 15% of water.

DETAILED DESCRIPTION OF THE INVENTION The present invention configured as described above will be more apparent with reference to the accompanying drawings.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

As shown in FIG. 1, the waste lime 100, which is a waste generated in a soda ash (sodium carbonate) manufacturing plant, is washed and removed using the washing machine 110.

Since the waste lime contains chlorides such as sodium chloride (NaCl) and calcium chloride (CaCl ₂ ), which are harmful factors for use as fertilizers as shown in Table 1, they cannot be manufactured as fertilizers. We tried to elute the components that are well soluble in water by using a powerful mixing washer.The concentration of salinity (chlorine component (Cl-)) for the sample remaining after elution was measured by Cl-electrode method (device analysis) and gravimetric method (AgCl precipitation weight analysis). ), Argento-metric Method (standard method, AgCl end point is measured by the color change due to the generation of Ag ₂ CrO ₄ ), etc. It was put in 200ml and stirred for 10 minutes to wash, ② sample: water = 20: 200 (10 times), 10: 200 (20 times), 4: 200 (50 times), 2: 200 (100 times) The chlorine ion concentration contained in each leaching water was measured.

The following <Table 3> shows the chlorine ion concentration of the elution sample, the washing conditions are ① put the sample dried at 110 ℃ in distilled water 200ml, stirred for 10 minutes and washed with ② filter paper Re-inserted into 200ml of distilled water and washed for 2 minutes by stirring for 10 minutes. ③ After filtration with filter paper and put into 200ml of distilled water and stirring for 10 minutes, the chlorine ion concentration of each filtrate was measured. . Repeating the washing experiment was to determine and determine how much washing water has the appropriate chlorine ion removal ability.

Table 3

Determination of Chlorine Ion Concentration in Washing Water

Method cleaning Electrode method Weight analysis Titration Total amount (mg) Concentration (ppm) Total amount (mg) Concentration (ppm) Total amount (mg) Concentration (ppm) 1st wash water 84.9 283 91.8 306 82.4 275 2nd wash water 4.23 14.1 3.34 11.1 4.75 15.8 3rd wash water 0.33 1.09 0.89 2.97 1.05 3.50

As shown in Table 3, the concentration of chlorine ion eluted at the time of one wash using 10-fold dilution water with respect to the sample is 8.49 wt%. It can be interpreted that it has a chloride concentration of about 14 wt%.

When the sample and water ratio were 10-fold and washed twice, the concentration of chlorine ion in the elution water was reduced to 0.283 wt%. At this time, the concentration of chloride contained in the sample was interpreted as 0.46 wt%. In the case of the third wash again, it showed a sharp decrease to 0.014 wt%. These results indicate that the high solubility of chloride is excellent even if washed once with more than about 10 times of washing water, and most of the chlorides are removed when washing twice with 10 times of water. .

Therefore, it can be seen that the salt contained in the waste lime can be easily removed by washing. As shown in the diagram, as shown in <Figure 1>, washing more than two washing processes using 10 times of water is actually performed. Since the salt removal ability did not change significantly, it was concluded that more than 10 times of washing water was used for washing, and that excellent salt removal could be obtained by the second washing.

<Figure 1> Dilution ratio and residual chlorine of wash water for desalination

Separation process to separate the product 130 or less 100 mesh and the contaminants 200 or more by using the vibration screen 120 having a 100 mesh (mesh) size of the waste lime washed through the washing process as described above Has

By removing various impurities and particles with large impurities in the waste lime washed through the sieve separation process, the product 130 of 100 mesh or less can be obtained, and the chemical composition of the product 130 is shown in the following <Table 4>. As in, it can be confirmed that the calcium oxide component contains 42.63wt%, which is determined to be in a mixed state of quicklime (CaO), limestone (CaCO ₃ ) and calcined lime (Ca (OH) ₂ ).

Table 4

Composition of Main Chemical Components of Waste Lime as Product of 100 Mesh or Less

Chemical composition moisture CaO MgO Fe ₂ O ₃ SiO ₂ CaSO ₄ NaCl ig. loss Composition (wt%) 44.5 42.63 18.56 1.35 5.23 3.20 0.46 28.54

As can be seen from the above table, in particular, the magnesium oxide (MgO) component has a high content of 18.56wt%, which is more than 15wt% oxidation based on the lime lime fertilizer of Table 2 above. It can be seen that the content of the magnesium (MgO) and the particle size criteria are met, and therefore, the product 130 has a quality that can be used as lime lime fertilizer.

The contaminants 200 of 100 mesh (0.14㎜) or more separated by the sieve separation process generate about 2 to 5wt%, and the difference in chemical composition is not so much, so that the building materials, soil stabilizers, ground stabilizers or landfills are separated from the fertilizer. It is judged that there will be no big problem even if used as a filling material.

The sieve separated product 130 is precipitated and separated through the sedimentation tank 140, and has a precipitation separation process to concentrate first.

The sedimentation separation tank 140 may use a method using gravity or a method of adding an additive or forcibly settling and separating.

The sedimentation separated primary concentrated lime lime has a dehydration process of dehydrating water to 50% or less using the vacuum dehydrator 150.

The dehydration process is to facilitate the introduction into the process for granulation, which is the next process by lowering the moisture content of the waste lime, and also to fully dehydrate the fine waste lime has a problem of cost. The vacuum dehydrator 150 may use another type of dehydrator as long as it satisfies the required moisture content.

Through the dehydration process it is possible to obtain a lime fertilizer (160) having a certain water content and available as a lime high-fertilizer, such a lime fertilizer (160) is stored in a separate container or immediately after the assembly manufacturing unit (170) Can be committed to.

The calcareous fertilizer 160 is put into the assembly manufacturing unit 170 to have an assembly manufacturing process of making a product having a certain size and shape.

The assembly manufacturing unit 170 is a conventional injection molding machine having an input container that can easily accept the lime-containing fertilizer 160 in the slurry state containing water to be manufactured in a constant size through a kneading process using a screw or the like. Can be used.

Products manufactured through the assembly manufacturing unit 170 can be variously changed according to the use of the fertilizer products to be used, for example, for agricultural fertilizers are manufactured with a particle size of 2 to 4 mm, such as conventional urea and compound fertilizers. In order to use it for forestry, it is manufactured in circular or cylindrical shape with the size of 10 ~ 20mm. In order to manufacture for the forest in the above may be subjected to a separate process, such as a granulator (210) in order to circularize the shape of the calcareous fertilizer (160) passed through the assembly maker 170.

The present invention does not use a separate caking agent for agglomeration of the lime fertilizer 160 in the slurry state in the granulation process as described above, thereby making it possible to make an environment-friendly product without any discharge of environmental pollutants.

The calcined fertilizer 160 containing a certain size, shape and moisture produced by the granulator 170 is put into the dryer 180 using a transfer means, and the granulated fertilizer 190, which is a final product, is 10-15. It has a drying process to contain% water.

The dry granulated fertilizer 190, which is dried in the above, may be mixed with livestock manure to dry the manure, and may be utilized as a fertilizer through an appropriate process.

The dryer 180 may select a dryer having various characteristics such as a dryer type such as a rotary type or a belt type and a drying type such as a batch type or a continuous type. The heat source for drying may be used as long as there is no problem in the properties of the product such as electricity and gas.

In the present invention, when using the process of completely dehydrating and drying the fine waste lime, it takes a lot of process cost, and then granulated in a certain form using an injection machine (kneader) in the state that already contains water and then dried Technology has been used to facilitate the process operation and improve the drying efficiency.

For reference, the following <Figure 2> and <Figure 3> is an embodiment of the granulated fertilizer (190), the final product produced after the drying process as described above.

<Figure 2> Prefabricated Calcium Fertilizer for Forestry

<Figure 3> Prefabricated Lime Fertilizer for Agriculture

The present invention can be variously modified and can take various forms and only the specific embodiments thereof are described in the detailed description of the invention. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.

According to the present invention provides a method for making granulated lime fertilizer at a minimum cost that satisfies the available quality and conditions through 100% separation screening and titration treatment of a large amount of waste lime generated as by-products in the workplace and the method It must be a useful invention having an effect that can be usefully used in agriculture and forestry by producing a product through.

In addition, by converting waste lime into other uses such as civil engineering and building materials, it improves resource effectiveness through recycling of resources and recycles discarded wastes.

In addition, by mixing waste lime with livestock manure, it is possible to easily treat livestock waste and to utilize it as a fertilizer, which has the effect of environmental pollution and resource recycling.

Claims (7)

In the manufacturing method of the calcareous fertilizer using waste lime, Washing the waste lime 100, which is a waste generated at the workplace, by using the washing machine 110 to increase the ratio of waste lime and water by 10 times and washing each time twice to remove chlorides that are well soluble in water in the waste lime; Separating process for separating the product 130 and the contaminant 200 using the washed waste lime using a vibrating sieve 120 having a mesh size of 100; Precipitation separation step of precipitating and separating the sieve separated product 130 through the sedimentation separation tank 140 to concentrate first; A dewatering process of recovering the lime fertilizer 160 by dehydrating the first concentrated waste lime to 50% or less with a vacuum dehydrator 150; An assembly manufacturing process of adding the lime fertilizer 160 to the assembly manufacturing unit 170 to produce a product having a predetermined size, shape, and moisture; And A drying step of putting the product produced through the granulation maker 170 into the dryer 180 so that the granulated fertilizer 190 as a final product contains 10 to 15% of water; Method for producing coarse lime fertilizer using waste lime, characterized in that consisting of. delete The method according to claim 1, The granulator Manufacture 170 is a granulated fertilizer using waste lime, characterized in that a conventional injection machine is used to produce a slurry of lime-containing fertilizer (160) in a predetermined size through a kneading process is used. Manufacturing method. The method according to claim 1, A method for producing coarse lime fertilizer using waste lime, characterized in that the size of the product manufactured through the granulation maker 170 is used as an agricultural fertilizer. The method according to claim 1, The manufacturing method of the granulated lime fertilizer using waste lime, characterized in that the size of the product manufactured through the granulation maker 170 is used as a forest fertilizer. The method according to claim 1, A method for producing coarse lime fertilizer using waste lime, characterized in that the product manufactured by the granulator 170 is spherical using a granulator. The method according to claim 1, Dryer 180 is assembled using waste lime, characterized in that carried out by selecting any one of the continuous type (belt type) and batch type (rotary type) of rotary type (batch type) Method for preparing calcified fertilizer.