JP2012020257A - Sintered material generation method and sintered material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sintered material generation method capable of using waste etc. more effectively, and a sintered material.SOLUTION: The method includes mixing sludge containing organic materials, crushed slag, and soil for adjusting the sintering which adjusts the sintering of sludge in the existence of water (S4, 5, 6), granulating the mixture (S7), and sintering the granulated mixture (S9).

Description

  The present invention relates to a method for producing a sintered product by sintering a waste material and reusing the waste material, and a sintered product.

  With increasing environmental awareness, waste is being treated and reused to reduce the burden on the environment. For example, sludge (sludge) deposited on rivers, lake bottoms, and the like, which is an example of waste, is decomposed by microorganisms and is reused for fertilizers and construction materials. Sludge such as animal manure from the livestock industry is also reused as fertilizer. In addition, slag discharged in large quantities from steelworks etc. is reused for road paving materials and bricks.

  Regarding the decomposition of sludge, Patent Document 1 discloses that the blast furnace granulated slag is not directly subjected to excessive processing, and even in the hydrogen sulfide atmosphere of sludge (sludge), directly to the sludge deposited on the bottom of the water without providing a nutrient source. There has been proposed a method for decomposing sludge that can act and decompose in a short time.

JP 2008-246324 A

  However, although the technique described in Patent Document 1 is effective for water quality maintenance, it is difficult to use for the treatment of sludge that has been dredged, and for the treatment of a large amount of residual soil generated from a construction site. It was unsuitable. As described above, in the prior art, the scope of application to waste and the like is often limited, and the waste and the like cannot be effectively used.

  This invention is made | formed in order to solve the said subject, and makes it a subject to provide the sintered compact production | generation method which can utilize a waste etc. more effectively, and a sintered compact.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a sludge containing organic matter, a pulverized slag, and a soil for adjusting the sintering for adjusting the sintering of the sludge, A mixing step for mixing in the presence, a granulating step for granulating the mixture in the mixing step, and a sintering step for sintering the granulated mixture.

  The invention described in claim 2 is characterized in that, in the sintered product generation method according to claim 1, a pH adjusting agent for adjusting the pH of the mixture is further added in the mixing step.

  Invention of Claim 3 is a sintered compact production | generation method of Claim 1 or Claim 2, In the said sintering step, the said granulated mixture is made into the 800-900 degreeC medium-high temperature area | region. It is characterized by sintering.

  According to a fourth aspect of the present invention, in the sintered product production method according to any one of the first to third aspects, the sintered product produced by sintering the mixture in the sintering step. It further comprises a microorganism adsorption step for adsorbing microorganisms.

  According to the fifth aspect of the present invention, a mixture obtained by mixing sludge containing organic matter, crushed slag, and soil for adjusting the sintering for adjusting the sintering of the sludge in the presence of water is baked. Conclude.

  The invention described in claim 6 is characterized in that the sintered product according to claim 5 is sintered by further adding a pH adjusting agent for adjusting the pH of the mixture.

  According to the present invention, sludge containing organic matter, crushed slag, and soil for adjusting sintering for adjusting sintering of sludge are mixed in the presence of water, and the mixed mixture is granulated. By sintering and sintering, the amount of organic matter in which pores are formed after combustion can be adjusted at the time of sintering, so that a sintered product having a mineral ratio of a mineral can be produced with an adjusted porous ratio. This sintered product can be used effectively, for example, minerals can be adjusted and microorganisms can be adsorbed by the sintered product or can be suspended in water due to the adjusted porosity.

It is a schematic diagram which shows the example of a schematic structure of the sintered compact production | generation system which concerns on embodiment of this invention. It is a flowchart which shows the procedure of the production | generation of the sintered compact in the sintered compact production | generation system of FIG.

  First, the structure and outline | summary function of the sintered compact production | generation system which concern on one Embodiment of this invention are demonstrated using FIG.

  FIG. 1 is a schematic diagram illustrating a schematic configuration example of a sintered product generation system 1 according to an embodiment of the present invention.

  As shown in FIG. 1, a sintered product generation system 1 includes a pulverizer 10 for pulverizing a slag discharged from a steel mill, a vibration sieving machine 11 for sieving the slag crushed by the pulverizer 10, and a construction Vibrating sieve 12 for sieving residual soil, etc., mixer 13 for mixing sludge such as dredged from rivers, etc., pulverized mines and construction residual soil, etc., and granulator 14 for granulating the sludge mixture A dryer 15 for drying the granulated sludge mixture, a sintering machine 16 for sintering the granulated sludge mixture, and a microorganism adsorption tank 17 for adsorbing microorganisms to the sintered product. .

  The pulverizer 10 includes, for example, a hammer crusher and a roller rolling machine, and after pulverization with a hammer crusher, the pulverizer 10 is further finely pulverized with a roller rolling machine and pulverized to a diameter of 1 mm or less. In order to increase the reactivity, 0.5 mm or less is preferable. The pulverizer 10 may be a ball mill.

  The crusher 10 also crushes aluminum dross (aluminum dross) generated when aluminum is melted. Almidros is used for pH adjustment.

  Here, the iron ore is a mixed oxide residue generated by the action of a solvent when a metal is smelted from ore, and steel slag containing iron (Fe) is preferable. This slag contains calcium oxide (CaO), magnesium oxide (MgO), etc., and is strongly alkaline (for example, pH 12-14).

  The vibration sieving machine 11 has a sieve of about 24.5 mesh (1 mm of mesh), and takes out the slag having a diameter of 1 mm or less from the slag crushed by the pulverizer 10.

  The vibration sieving machine 12 sifts dry construction residual soil and takes out soil of 5 mm or less. Here, the soil is an example of a soil for adjusting the sintering for adjusting the sintering of the sludge, and includes clay and silt components necessary for the sintering. In addition, when there are many clay and silt components in sludge, sand may be used instead of soil.

  The mixer 13 is a container having a stirrer (not shown). The stirrer has a stirring blade (impeller) driven by a motor. The mixing machine 13 is charged with the slag from the vibrating screen 11 and the soil for adjusting the sintering for adjusting the sintering from the vibrating screen 12 and stirred in a powder state. Sludge whose moisture has been adjusted is charged, and the mixture is kneaded by a stirring blade.

  Here, sludge is sludge drowned from rivers or the seabed, sludge collected from sewage treatment plants, factory wastewater treatment facilities, etc., animal manure generated from livestock farming, and the like. These sludges have organic matter and water. In some cases, these sludges contain heavy metals such as zinc, arsenic, mercury, and cadmium.

  The granulator 14 is a machine that granulates the sludge mixture, and forms the sludge mixture into pellets such as a spherical shape, a cylindrical shape, and a chip shape by extrusion from a hole, rolling, and compression. In the case of a spherical shape, the granulator 14 is formed into pellets having a diameter of about 10 mm.

  The dryer 15 is a kiln dryer, and heats the kiln while rotating to dry the granulated sludge mixture. The dryer 15 may be a machine that dries a mixture of sludge granulated by microwaves, air blowing, or natural drying.

  The sintering machine 16 is a firing furnace that sinters a mixture of granulated sludge in a medium to high temperature range of 800 to 900 ° C. in a state where oxygen is present by combustion of gas or petroleum or electricity. The granulated sludge mixture is baked and solidified by the sintering machine 16, and the heavy metal contained in the soil for sintering adjustment and the heavy metal in the sludge are detoxified by the iron component contained in the ore.

  The microorganism adsorption tank 17 is a water tank in which microorganisms useful for soil improvement are propagated. A sintered product sintered by the sintering machine 16 is put into the microorganism adsorption tank 17, and microorganisms are adsorbed to the sintered product.

Next, operation | movement of the sintered compact production | generation system 1 is demonstrated using figures.
FIG. 2 is a flowchart showing a procedure for generating a sludge sintered product in the sintered product generating system 1.

  As shown in FIG. 2, first, a precipitation flocculant is introduced into and mixed with sludge (step S1). Specifically, after the sludge containing moisture is put into a settling tank (not shown), a settling coagulant is put and mixed while stirring. The supernatant water is removed so that the sludge settles and the amount of water in the sludge becomes an appropriate amount.

  Here, as the precipitation aggregating agent, for example, a precipitation aggregating agent obtained by adding a shell fossil (a stone formed by depositing shellfish, mosses, etc.) to an inorganic aggregating agent such as calcium sulfate or calcium carbonate. It is done.

  In the case of dried sludge and sludge with a low water content, it is not necessary to add a precipitation flocculant. Conversely, it is easy to mix slag and sludge, or with heavy metals of slag and sludge. Water may be added to make it easier to react.

  Next, the sludge is analyzed (step S2). Specifically, component analysis such as analysis of sludge pH, amount of organic matter, amount of moisture, amount of silt and clay content is performed. Analysis of pH is performed with a normal pH meter or pH test paper.

  Next, the pulverizer 10 pulverizes the iron ore (step S3). Specifically, the slag is pulverized by the hammer crusher of the pulverizer 10 and further finely pulverized by the roller rolling machine of the pulverizer 10. In order to make it easier for the heavy metals in the sludge and iron to combine, the slag is finely crushed.

  And the vibration sieve machine 11 sieves the crushed slag and takes out the slag having a diameter of 1 mm or less.

  Next, the vibration sieving machine 12 sifts dry normal soil, construction residual soil (an example of soil for sintering adjustment), etc., and takes out soil of 5 mm or less. The amount of soil charged into the mixer 13 is determined by the ratio of inorganic and organic substances contained in the sludge and the ratio of inorganic and organic substances contained in the soil. This soil for adjusting the sintering adjusts the ratio of inorganic and organic substances in the mixture to be sintered. Also, the viscosity of the mixture when the soil for sintering adjustment is kneaded by the mixer 13 is adjusted.

  Next, the mixer 13 mixes the crushed slag and the soil for adjusting the sintering (step S4). Specifically, the iron ore having a diameter of 1 mm or less, which has been pulverized and sieved by the crusher 10, and the soil of 5 mm or less that has been sieved by the vibration sieve 12 are put into the mixer 13, and the mixer 13 is stirred. Stirred by wings.

  Next, the pH adjuster is charged into the mixer 13 and mixed (step S5). For example, as the pH adjuster, aluminum dross (aluminum dross) generated as an impurity in the aluminum melting step is introduced. The aluminum dross is pulverized by the pulverizer 10 and then sifted by the vibration sieving machine 11 and then charged into the mixer 13. Also, aluminum dross is acidic at about pH 2, and a mixture of sludge and slag is added so that the mixture has a pH of 6.5-9.

  Next, sludge is thrown into the mixer 13 and mixed (step S6). The sludge that has been precipitated and agglomerated in step S1 is added to the mixer 13 in which the pulverized slag and soil have been added while stirring. Then, a mixture of sludge containing water and organic matter, crushed slag, and soil for adjusting the sintering for adjusting the sintering of the sludge is mixed at a rotational speed of about 60 rpm by the stirring blade of the mixer 13. Knead together. Due to the kneading of the mixer 13, the viscosity of the mixture increases. Depending on the kneading state, water may be added to the mixer 13 to adjust the viscosity of the mixture.

  Next, the granulator 14 granulates the mixture kneaded by the mixer 13 (step S7). The granulator 14 makes spherical pellets having a diameter of about 10 mm. By making pellets, the mixture is easily dried and sintered easily.

  Next, the dryer 15 dries the mixture granulated by the granulator 14 (step S8). The dryer 15 (kiln dryer) is heated to about 350 ° C. while rotating the kiln of the dryer 15 to dry the granulated sludge mixture.

  Next, the sintering machine 16 sinters the mixture granulated in the intermediate temperature region of 800 to 900 ° C. (step S9). Preferably, the sintering machine 16 sinters the mixture at a firing temperature of 850 ° C. to generate a sintered product.

  When the sintering machine 16 sinters the mixture in the presence of oxygen, the inorganic substance contained in the mixture is sintered and the organic substance contained in the mixture burns. To the center, it can be brought close to 850 ° C medium and high temperature quickly. Also, the sintered mixture becomes porous enough to float in water. Further, at the stage of baking and solidifying the granulated sludge mixture, the iron component contained in the slag reacts with the heavy metal contained in the soil for adjusting the sintering and the heavy metal of the sludge. The vaporized heavy metal is collected by an exhaust treatment device (scrubber).

  Next, in the microorganism adsorption tank 17, microorganisms are adsorbed on the sintered product and dried (step S10). The sintered product generated in step S9 is put into the microorganism adsorption tank 17 in which microorganisms useful for soil improvement are propagated, and the microorganisms are adsorbed on the sintered product. At this time, since the porous sintered product is easily floated, a weight is placed thereon. A liquid containing microorganisms may be sprayed onto the sintered mixture by spraying. Then, after sufficiently adsorbing microorganisms, the sintered product is dried.

  As described above, according to the present embodiment, the sludge containing organic matter, the slag crushed by the pulverizer 10, and the soil for adjusting the sintering for adjusting the sintering of the sludge are present by the mixer 13. Since the amount of organic matter in which pores are formed after combustion can be adjusted during sintering by mixing the mixture under granulation and granulating the mixture mixed with the granulator 14 and sintering with the sintering machine 16, Sintered materials with mineral minerals can be produced with a controlled proportion of quality. This sintered product can be used effectively, for example, minerals can be adjusted according to the amount of iron ore, and microorganisms can be adsorbed on the sintered product or floated on water by the adjusted porosity. The sintered product becomes more porous when the mixture contains a large amount of organic matter.

  In addition, the iron content in the slag is combined with heavy metals such as zinc, arsenic, mercury and cadmium contained in the sludge and contaminated soil at the stage where the granulated sludge mixture is baked and solidified to stabilize the heavy metals. Let it be detoxified. This is similar to a ferrite treatment in which iron salt is added to wastewater containing heavy metals and various heavy metal ions are confined in the ferrite crystal lattice.

  Moreover, the dioxin contained in sludge etc. can be decomposed | disassembled and made harmless by sintering.

  If a strong alkali slag is put into a river or the like as it is, the water quality may be affected. However, the effect on the water quality can be reduced by sintering with sludge or soil.

  Moreover, since the mineral is confined by sintering, when the sintered product is put on the soil, the mineral can be gradually supplied to the soil. In particular, it can supply divalent iron ions and can be used to grow algae in seaweed beds such as kelp and seaweed, and plants on farms.

  In addition, if the sintered product is poured into a river or lake and submerged or floated, the microorganism can settle and propagate in the porous portion of the sintered product without adsorbing the microorganism in step S10. Can be used to improve water quality. In addition, when the sintered product is spread on the soil, microorganisms can settle and propagate in the porous part of the sintered product, so that the soil is improved and the productivity of the plant can be improved.

  Moreover, when adding the pH adjuster (for example, aluminum dross) for adjusting the pH of a mixture, pH of a sintered compact can be adjusted and the sintered compact matched with the pH of each soil can be produced | generated. In addition, as in the technique described in Patent Document 1, if the slag is put into a river or the like as it is, there is a risk of affecting the water quality, but the strong alkali slag is neutralized with acidic aluminum dross and sintered. Thus, the influence on the water quality can be further reduced.

  In addition, when the granulated mixture is sintered in a medium to high temperature range of 800 to 900 ° C., the organic matter in the mixture is carbonized and burned by oxygen, so the temperature approaches the firing temperature quickly to the center, and the firing temperature. Dioxins can be decomposed without increasing the temperature to 1000 ° C. or higher. Moreover, in order to raise the temperature to the center of the pellet to 800 ° C. or higher, which is required for the decomposition of dioxins, conventionally, the firing temperature has been required to be 1000 ° C. or higher. Since it can sinter in a field, the cost required for sintering can be reduced.

  In addition, when microorganisms are adsorbed to the generated sintered product, the microorganisms are adsorbed in the porous part of the sintered product, so the sintered product can be put into a river or lake to sink or float. Water quality can be improved. Since microorganisms are trapped in the porous portion of the sintered product, the sintered product can be continuously used for improving the water quality. Moreover, since microorganisms are easy to propagate in the porous part of a sintered compact, it can utilize for soil improvement and can aim at the improvement of plant production.

  In addition, like step S4 to step S6, after mixing the pulverized slag, soil, and the pH adjuster, the sludge containing moisture is not put in, but the sludge containing moisture is put in the mixer 13 first. The slag, ground, and pH adjusting agent pulverized while stirring may be gradually added.

  The present invention is not limited to the above embodiments. Each of the embodiments described above is an exemplification, and any configuration that has substantially the same configuration as the technical idea described in the claims of the present invention and has the same operational effects can be used. It is included in the technical scope of the present invention.

1: Sintered product generation system 10: Crusher 13: Mixer 14: Granulator 16: Sinter 17: Microbial adsorption tank

Claims (6)

A mixing step of mixing the sludge containing organic matter, the crushed slag, and the soil for adjusting the sintering for adjusting the sintering of the sludge in the presence of water;
A granulating step for granulating the mixture in the mixing step;
A sintering step of sintering the granulated mixture;
A method for producing a sinter. In the sintered compact production | generation method of Claim 1,
In the mixing step, a pH adjusting agent for adjusting the pH of the mixture is further added. In the sintered compact production | generation method of Claim 1 or Claim 2,
In the sintering step, the granulated mixture is sintered in a medium to high temperature region of 800 to 900 ° C. In the sintered compact production | generation method of any one of Claims 1-3,
A method for producing a sintered product, further comprising a microorganism adsorption step for adsorbing microorganisms to the sintered product produced by sintering the mixture in the sintering step.   A sintered product obtained by sintering a mixture obtained by mixing sludge containing organic matter, crushed slag, and soil for adjusting sintering for adjusting sintering of the sludge in the presence of water. In the sintered product according to claim 5,
A sintered product obtained by further adding and sintering a pH adjusting agent for adjusting the pH of the mixture.

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