KR100416474B1 - The method of making filler for bituminous paving mixtures and construction materials using rock fine sludge. - Google Patents

Abstract

The present invention relates to a bitumen packing filler using rock fine powder sludge, and a method for manufacturing the same, and a composition of cement mortar prepared by using the same. Particularly, the present invention is a by-product during the manufacture of crushed sand using rocks, causing pollution. By providing a method for using bitumen fine sludge as a raw material for bitumen packing and building materials, it eliminates the cause of pollution and at the same time provides it as a raw material for building materials such as bitumen packing sieve and cement brick, which is set by the Korean Industrial Standard. .

The present invention for this purpose is to cut the finely divided rock fine sludge cake of 20 to 30% moisture content generated from the crushed sand manufacturing process with a compressed feeder into the rotary kiln and dried to less than 1% moisture content It is crushed by the hammer crusher, which is an impact type crusher, and then classified into an airseperator using a scrub conveyor and a bucket aerator. The method is to produce bitumen packing materials and building materials.

Description

Filler for bitumen packing using rock fine sludge, and a method for manufacturing the same, and a composition of cement mortar prepared using the same {The method of making filler for bituminous paving mixtures and construction materials using rock fine sludge.}

The present invention relates to a bitumen packing filler using rock fine powder sludge generated from a process of manufacturing artificial crushed stone as a rock, and a method of manufacturing the same and a composition of cement mortar prepared using the same. Most of the sludge produced in the manufacturing process of artificial crushed sand (crushed sand) shows the particle size distribution, and also contains a large amount of silicic acid (SIO2) powder of 400 mesh or less, The present invention relates to a method for manufacturing a bitumen packing material and construction material in accordance with the Korean Industrial Standard.

As is well known, bitumen packing fillers are specified in Korean Industrial Standards as limestone powder, portland cement, slaked lime, fly ash, recovered dust, furnace steelmaking dust, casting dust, powders of various incineration ashes and other mineral substances. It is said to be free of harmful substances such as dust, mud, organic matter and agglomerated particulates.

Limestone powder used in the prior art has to be prepared by crushing, crushing and classifying limestone to produce a filling material, and thus, there is no hard material due to high production cost, and cement and slaked lime are also inadequate to be used as a filling material.

Pulaies and dusts contain unburned charcoal and usually have a calorie of 500 to 1,000 calories, which is expensive due to excessive treatment cost and causes many problems in practical use such as causing pollution by scattering in the atmosphere of dust.

Dust used in steelmaking is used as a filling material. Patents related to this are Korean Patent Nos. 91-6004, 96-0012716, and Patent Publication No. 2000-0036361. A first step of heating the dust to 800 ° C. or more to remove the carbon powder in the dust, a second step of mixing the dust from which the carbon content is removed with an aswald at a temperature of 140 to 160 ° C., and the mixture; It is a method for producing ascone by mixing aggregates such as stone powder sand gravel. This method describes the process of heating dust to 800 degreeC or more, removing a carbon content, mixing dust with an aswald at the temperature of 140-160 degreeC, obtaining a mixture, and mixing with aggregate.

Patent No. 98-0012716 refers to a sample of steelmaking dust used in an Ascon factory, which is used to heat the dust at a temperature of 200 ° C. to 600 ° C. or higher when it is inconvenient and inadequate to use a pass product by performing a quality test of the filling material. It is described. All of these have energy-consuming problems and are cumbersome to perform analytical tests every time they are used. In addition, generally, steel ash dust is mainly made of iron in raw ore and is a minor component of zinc, cadmium, lead, and chromium. Heavy metals, such as copper and copper, are scattered in the steelmaking process and mixed in dust. Of course, there are no heavy metals or few raw ores, but most of them are heavy metals, so they are not chemically safe fillers. Therefore, when making asphalt using this irregular dust, it is not environmentally safe to be exposed to heavy metals when the asphalt is worn out due to aging and scattered with dust.

In other words, dust produced in the steelmaking and steelmaking processes is collected in dust collectors during the static electrostatic precipitating process in furnaces or electric furnaces. Thus, the collected dust contains a large amount of iron oxide (Fe2o3), zinc oxide (Zno), silica (Sio2), It is composed of calcium oxide (Cao), taso powder and some sulfur, and harmful substances include lead (Pb), cadmium (Cd), chromium (Cr), and copper (Cu).

Patent Publication No. 2000-0036361 describes the use of an appropriate amount of steelmaking dust and incineration materials in a weight ratio.

As mentioned above, ash from ash and incinerator generated during steelmaking and steelmaking is used as a filling material for Aswald. The composition, physical properties, and chemical properties vary depending on the source and the raw material minerals. It is safe and cumbersome to use afterwards.

However, the filling material of the present invention is a rock fine powder generated in the process of manufacturing a generally used aggregate, and its physical and chemical properties have the same physical and chemical properties as those of the aggregate used for the production of asbalt. There is a characteristic. That is, the general chemical composition of rock fine sludge consists mainly of Sio2, Al2o3, and is composed of minor components of Fe2o3, Cao, Mgo, K2o, Na2o, and trace amounts of Tio2, Mno, P2o5. Therefore, it is a safe material without heavy metals.

Rock powder sludge is classified into sand by hydro-cyclone in the process of wet sand crushing, and it is dehydrated and discarded as a cake press with a water content of 25-30% by filter press. Although it is disposed of after disposal, it is the cause of pollution such as collapse of structure due to the flow of the ground when the structure is built on the surface of soil and scattered by dry ground, and the chemical composition is the same as raw material rock of aggregate. Therefore, no pollution such as leachate will be different from steel and steel steel dust containing heavy metals.

It is an object of the present invention to provide a method and process for producing a bitumen packing filler using low cost, efficient and environmentally friendly rock fine sludge. It is another object of the present invention to provide a composition and a method for preparing cement block raw material, which is a building finishing material and cement secondary product using rock fine powder sludge.

To this end, the present invention is difficult to recycle other than landfill in the present state of sludge which is compression-computed in the state of a 25m to 30% plate cake of 1.2m in width 5cm thickness. The rock fine powder sludge has a water content of about 30% and the particle size distribution has a particle size of 99.35% at 30 mesh, 95.35% at 50 mesh, 81.85% at 100 mesh, and 51.20% at 200 mesh as shown in FIG. In order to recycle it, the water content is 1.0% or less, which is the quality requirement of bitumen packing material, and the pass rate of each bond at granularity is 100% through 30 mesh, 95% or more through 50 mesh, and 90% or more through 100 mesh. In other words, the technical problem of making the material meet the Korean industrial standard passing more than 70% in 200 mesh must be solved.

The present invention is suitable for rock fine powder sludge to meet the quality standards of bitumen packing fillers, and easy to mix materials such as aggregates and cement of cement products, and dry treatment rock fine powder sludge aggregates, cement, dry rock fine powder It is possible to mix and mix water, and the wet treated fine powder sludge has been devised to solve the process as shown in Fig. 1. Technical composition of the present invention for this, a) water content of 5 to 30% by weight of wet Storing the sludge cake in a hopper and then feeding the dry sludge using a cutter device at the end of feeding the sludge cake to a compressed feeder; And b) drying the sludge cake cut and supplied in step a) while partially crushing the dried slag cake in a drying process with a dryer rotary kiln; And c) crushing and pulverizing the sludge cake mass dried in the step b) with an impact crusher such as a compressed raymond mill, a hammer crusher, a pin crusher, etc .; And d) a process of manufacturing a closed circuit from the process of drying with a dry kiln after step c) includes a plurality of screw conveyors and a bucket for transferring raw materials to a plurality of screw conveyors and bucket elevators and pulverized fine sludge. Transferring using an elevator or the like; And e) the cut point of the cut point with an air classifier using centrifugal force and gravity inertia, such as dry cyclone and air classifier, which was transferred using the closed circuit in step d). Classifying to 200 mesh; And f) collecting the rock fine powder classified in step e) with a back filter; And g) storing 2 ~ 3% of water content of rock fine powder collected in step f), 150 ~ 200 mesh of particle size, and passing rate of 70 ~ 80% in a ore bin and then shipping them in packaging or bulk. step; H) Filling materials for bitumen packing, including rock fine powder collected by cyclone and lump filter in the screening process, by screening the rock fine powder produced through the dry process of each step and the crushed sand manufacturing process. It is characterized in that it comprises a. The machine and apparatus for preparing bituminous packaging filler using rock fine powder sludge by the process method as shown in Figure 1 of the present invention is as follows: a) Hopper for storing and supplying the sludge cake ( hopper); And b) a compressed feeder in which the sludge stored in the hopper of step a) is cut at the end of the hopper; And c) a conveyor for transporting the sludge supplied in step b); And d) a dry kiln conveyed and dried in step c). And e) a plurality of screw conveyors and bucket elevators for transferring raw materials to prevent undispersed from the process of drying with a dry kiln in step d) to prevent undispersed; and f) of step e). Screw conveyors or bucket elevators compressed raymond mills or impact hammer crushers or pin crushers (aka cage mills) for crushing and disintegrating dried sludge transported; And g) a dry cyclone or an air crater for conveying and classifying the sludge pulverized and crushed in the step f) into a bucket error elevator; And h) a back filter for collecting the rock fines classified in step g); I) a reservoir for storing the fine rock collected in the step h); J) When the dry fine powder is manufactured using the above series of processes, the dry cyclone of step g) and the screen are used as a closed circuit when classifying the crushed sand into the vibrating screen before the wet treatment of the crushed sand manufacturing process. A machine and apparatus for producing a bituminous pavement material comprising the steps of: h) collecting the fines using a back filter and storing and shipping them in a reservoir in step i. A feature of the present invention is a rock fine powder having a water content of less than 30%. The sludge cake was dried and crushed into sand and the sludge cake was mixed with impurities such as rock fragments, fine aggregates and fine powder into impact and compression shredders, and the air classifier using centrifugal force and gravity inertia. It is a simple process to classify at ~ 300 mesh classification point to manufacture bitumen filler and to make steel asdust. As described above, the carbon is removed by heat treatment at a temperature of 200 ° C. or more and 800 ° C., or heated to 140 to 160 ° C., and not mixed with asbalt, and heated in a general asbalt manufacturing process without heating the rock fine powder prepared in the above process. (140-160 ° C) It is characterized by being able to mix asbestos and aggregate with rock fine powder of about 4%.

The chemical composition of rock fine sludge is safe from heavy metals such as Cu, Cd, Pb, Cr, etc., and the fine powder sludge by-produced from the process of manufacturing artificial crushed sand with the components and composition ratios as shown in Table 1 It is formed by the blending ratio.

TABLE 1

Experimental results of rock fine sludge produced by the above process were tested according to the provisions of the KS F3501 and KS F 4419 interlocking blocks and KS F 4004 cement bricks of bitumen packing fillers. It will be described in detail by.

<< Example 1 >>

In the process of manufacturing crushed sand with chemical granite stones as shown in Table 1, the fine powdered sludge cake with 30% water content and 200 mesh passing rate 51,20% was dried in a drying furnace with 0.3% water content in a drying furnace and The particle size and physical properties of the finely divided sludge samples collected by the pulverized filter were classified by air classifier that synthesized centrifugal force and gravity after crushing to 200 mesh classification point according to KS F3501-'95 and F2303,2304-'95. The physical properties were tested and the results are shown in Table 2.

<< Example 2 >>

Fine sludge cake with 30% water content and 81.85% by-pass rate of by-products produced during the manufacture of crushed sand from mixed aqueous rocks such as sandstone, silt rock, and sail having chemical composition as shown in Table 1 KS F3501-'95 and F 2303, 2304- sample prepared by drying with a water content of 0.1% and then crushed with a hammer crusher were classified into dry cyclones and collected with a bag filter to be suitable for bitumen packing fillers. Physical properties were tested by the test method according to '95 and the results are shown in Table 2.

<Table 2>

<< Example 3 >>

It is a block manufacturing experiment example of cement secondary products using the rock fine powder produced by the manufacturing process of the present invention as an aggregate raw material.

In order to utilize aggregate 30% of rock fine powder sludge cake by-produced in artificial crushing stone manufacturing process as a substitute for aggregate, the fine powder classified by dry crushing in the manufacturing process of the present invention was changed by changing the type of aggregate, mortar mixing ratio, and rock powder replacement rate. Was carried out. Combination design with the weight ratio as shown in Table 3 was carried out to manufacture concrete inlocking blocks and cement blocks for sidewalks according to KS F4419 and KS F 4004. The flexural strength, water absorption, compressive strength, specific gravity, and water absorption were measured.

KS F4419 has a water to cement ratio of 25% by weight, but generally exceeds the weight of water. Therefore, in this test, the mixing ratio of cement and aggregate was fixed, and the block was manufactured by changing the substitution rate of water: cement ratio and aggregate into rock fine powder, and the flexural strength and compressive strength were tested.The highest strength was measured when the water: cement ratio was 45% by weight. In the embodiment of the present invention, the water: cement ratio was changed to 45% by weight, 55% by weight, 65% by weight, and 70% by weight, as shown in Table 3, in order to meet the proper strength of the dough based on this result. The mixing ratio of the aggregate was 1 to 4 and 1 to 6, and the aggregate was 100% of the crushed sand. The aggregate was 100% by weight and these aggregates were 5% by weight, 10% by weight, 15% by weight, 20% by weight, and 30% by rock fine powder. 100% by weight, 50% by weight and 100% by weight, respectively, for 1 minute of dry beams, 1 minute of water mixed beams, 90 seconds of stationary, 90 seconds of revival, and put into the basic block type I mold of KS F4419. 28 days of curing in a 20 ° C water bath under pressure The results of measuring the flexural strength, compressive strength, dry weight, dry weight and water absorption are shown in Table 3. KS F 4419 specifies the flexural strength of interlocking block over 60kg / ㎠ and absorption rate less than 7%. On the basis of this, when the differential substitution rate is less than 20% by weight, it can be confirmed that both flexural strength and water absorption meet the criteria of KS F4419, but when it exceeds 20%, the absorption rate is measured as 7% or more, which is not suitable as an interlocking block. can do.

KS F 4004 specifies concrete bricks. In particular, Class C Class 1 has a compressive strength of more than 163kg / ㎠ and absorption rate less than 7%. Class C Class 2 has a compressive strength of 82Kg / ㎠ and 10% absorption rate. Based on the following Table 3, it could be confirmed that the rock fine powder substitution rate up to 100% satisfies the class C standard of KS F4004 for both compressive strength and water absorption. In Example 3, the test was performed without using a water reducing agent. When 0.15% of a water reducing agent (AE / C) is added, the water cement ratio may be reduced, thereby increasing the strength and decreasing the water absorption rate. Shrinkage rate increases as the rock fine powder replacement rate increases, but block production brings only the shrinkage of blocks, but does not crack. In addition, as the specific gravity of cement blocks increases, the specific gravity decreases as the replacement rate of rock fine powder is reduced, making it lighter and making lighter blocks.The rock fine powder is filled in the gaps of aggregates when manufacturing interlocking blocks. It can be seen that the appropriate amount of substitution can increase the flexural strength and the compressive strength. Therefore, it can be seen that it is possible to substitute the aggregate for the manufacture of interlocking blocks and concrete blocks using rock fine powder prepared with bitumen paver.

<Table 3>

1 is a manufacturing process flow chart of a bitumen packing material.

2 is a particle size distribution diagram of a rock fine powder sludge cake.

As described above, the present invention is used for the production of bitumen packing fillers prepared using rock fine powder sludge, and the production of bitumen packing fillers using rock fine powder sludge having a water content of about 30% by using interlocking blocks and concrete bricks. It is an invention that provides a method and is also useful as a material that can substitute the bitumen paving material for the aggregate for cement brick production.

In addition, by using the finely divided rock sludge, which is classified as general industrial waste and used as a useful resource, it has side effects to reduce the cost of crushed sand manufacturing and to prevent environmental damage due to air pollution and loss of rainy weather around the sludge stockpile at the crushing plant to provide.

Claims (6)

a) storing the wet sludge cake having a moisture content of 5 to 30% by weight in a hopper and then cutting it into a dry kiln by using a cutter device at the end of feeding the wet sludge cake to a compressed feeder; Wow b) drying the sludge cake cut and supplied in step a) while partially crushing the dried slag cake with a dry rotary kiln; Wow c) pulverizing and crushing the sludge cake mass dried in the step b) with a compression and impact crusher; Wow d) The process of manufacturing a closed circuit from the process of drying with a dry kiln after step c) includes a plurality of screw conveyors, a bucket elevator, and a bucket elevator for transferring raw materials to a plurality of screw conveyors and bucket elevators. Transferring to a Bercate elevator; Wow e) 150 ~ 200 mesh cut point with air classifier using centrifugal force and gravity inertia of dry cyclone and air classifier Classifying into; Wow f) collecting the rock fine powder classified in step e) with a back filter; Wow g) storing 2 ~ 3% of water content of rock fine powder collected in step f), 150 ~ 200 mesh of particle size, and 70 ~ 80% of passing rate in a ore bin, and then shipping them in packaging and bulk. ; Wow h) Screening the rock fine powder produced by the dry process of the above-mentioned step and the process of making the sand of the sand, and the fine powder packing material including the rock fine powder collected by the cyclone and the back filter during the classification process. Step of manufacturing; Method for producing a bitumen packing filler using fine powder sludge rock comprising the. The method of claim 1, wherein the bitumen packing material is a rock fine powder of 2-3% by weight, 150-200 mesh, 70-80% of a pass rate of 70% to 80%, which is made of rock fine powder and rock fine powder sludge cake which are by-produced in the crushed sand manufacturing process. Method for producing a bituminous pavement filling material using rock fine powder sludge, characterized in that. The method of manufacturing a bitumen packing filler using rock fine powder sludge according to claim 1, wherein the raw material for the bitumen packing filler consists of only rock fine powder sludge which is by-produced in the crushed sand treatment process. A bitumen packing filler using rock fine powder sludge produced by the method of claim 1. A composition of cement mortar prepared by adding 5 to 100% by weight of the bitumen packing filler to cement mortar using the bitumen packing filler prepared by the method of claim 1. The method of claim 5 wherein The composition of the cement mortar is a composition of cement mortar, characterized in that the use of rock fine powder of water content of 2 to 50% by weight.