CN110642545A - Preparation method of open-graded steel slag aggregate - Google Patents
Preparation method of open-graded steel slag aggregate Download PDFInfo
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- CN110642545A CN110642545A CN201911049694.7A CN201911049694A CN110642545A CN 110642545 A CN110642545 A CN 110642545A CN 201911049694 A CN201911049694 A CN 201911049694A CN 110642545 A CN110642545 A CN 110642545A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention relates to a preparation method of open-graded steel slag aggregate, which comprises the following steps: s01, carrying out magnetic separation on the steel slag with the particle size of 0-40 mm after primary crushing and iron selection by using a jaw crusher; s02, classifying the non-magnetic separated part by a vibrating screen, and sending steel slag particles with the particle size of 5-10 mm to the next working procedure for processing; s03, carrying out stability inspection on the steel slag particles with the particle size of 5-10 mm, jumping to S05 if the steel slag particles are qualified, and carrying out S04 if the steel slag particles are unqualified; s04, stabilizing the steel slag particles of 5-10 mm to ensure that the f-CaO is fully digested; s05, cleaning the obtained steel slag particles of 5-10 mm to obtain steel slag aggregate; s06, screening the cleaned steel slag aggregate to remove irregular particles, wherein the oversize material is the open-graded steel slag aggregate. Compared with the conventional steel slag aggregate, the porosity is reduced by 20 percent.
Description
Technical Field
The invention relates to the field of solid waste resource utilization, in particular to a preparation method of open-graded steel slag aggregate.
Background
Sponge city construction is an important development direction of national city construction, according to the planning of the Ministry of civil construction, the sponge city transformation is completed in 20% of the built-up areas of the national cities in 2020, and the transformation is completed in 80% of the built-up areas of the national cities in 2030. Permeable paving materials such as permeable bricks and the like are widely applied to sponge city construction, and the market has a strong demand for open-graded broken stone aggregates.
In recent years, with the gradual increase of national environmental protection requirements, behaviors of destroying natural environments such as mountain mining and stone mining are greatly limited, and meanwhile, the price of the crushed stone raw material in infrastructure construction is increased, and the high-quality crushed stone resource presents a situation of short supply and short demand in the market.
On the other hand, steel enterprises in China generate more than 1 hundred million tons of steel slag every year, the effective resource utilization rate is less than 30 percent, a large amount of steel slag is accumulated like a mountain, land is occupied, and the environment is polluted. After the steel slag is treated by the working procedures of crushing, iron selection, screening and the like, a large amount of granular materials with irregular shapes are formed. Wherein the part with certain size can be used as aggregate to replace broken stones or pebbles.
A large number of documents report that the steel slag is used as the aggregate for producing the water permeable brick, but relevant researches mainly focus on how to prepare the water permeable brick product by using the steel slag as the raw material to replace the crushed stone and mixing the crushed stone with other raw materials, and the secondary processing of the steel slag aggregate raw material and the quality problem research of the open-graded steel slag aggregate raw material are less.
The cement-based water permeable brick is a porous material and comprises aggregates, a cementing material, an additive and the like, the quality and the manufacturing cost of the cement-based water permeable brick have a great relationship with the aggregates, and high-quality aggregates can not only improve the product strength and the water permeability of the water permeable brick, but also reduce the using amount of the cementing material and the additive with higher cost, and are very important for the product quality and the manufacturing cost of the water permeable brick.
The bulk porosity of the aggregate is defined as (1-bulk density/bulk density) × 100%, and characterizes whether the material particles are packed tightly, the closer the material is packed, the smaller the gaps between the particles, and the lower the porosity of the aggregate, while if the material is difficult to achieve tight packing, the greater the porosity between the inner particles. When the concrete product is prepared, aggregates are tightly stacked, the porosity is low, the quantity of cementing materials required for preparing the product with the same strength grade is relatively small, and the cost of the product is favorably reduced.
At present, crushing and magnetic separation processes are generally adopted in secondary processing of steel slag in China, and because a part of metal such as particle steel, slag steel and the like is contained in raw steel slag, the shell of a crusher is easy to clamp, a jaw crusher which is easy to maintain and high in material adaptability is often adopted as primary crushing equipment to crush large steel slag (>40mm), after magnetic separation and screening, a cone crusher with low energy consumption is adopted as secondary crushing (10-40 mm) equipment to perform secondary magnetic separation and screening, the obtained magnetic separation material is returned to be used in a sintering or steelmaking process, and tailings are sold for treatment. As the jaw crusher and the cone crusher both belong to extrusion type crushing, the equipment structure and the crushing principle determine that a large amount of needle sheet-shaped irregular particles inevitably exist in materials crushed by the crusher, the irregular particles are quite unfavorable for accumulation, and when the particles are used as aggregate, the steel slag has high aggregate porosity and poor aggregate quality, and is used for preparing water permeable bricks, so that the problems that the strength of the water permeable bricks is difficult to reach the standard, the using amount of cementing materials is large, the cost is high and the like are easily caused.
In addition, f-CaO exists in the steel slag, and needs to be properly treated before being used as aggregate, so that the poor stability of the permeable brick product is avoided; meanwhile, the surface of the steel slag should be cleaned to reduce the mud content of the steel slag.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of open-graded steel slag aggregate to overcome the defects in the prior art.
The technical scheme for solving the technical problems is as follows: a preparation method of open-graded steel slag aggregate comprises the following steps:
s01, carrying out magnetic separation on the steel slag with the particle size of 0-40 mm after the steel slag is subjected to primary crushing and iron selection by a jaw crusher, and returning the selected magnetic separation material to the sintering or steel-making process for use;
s02, classifying the non-magnetic separated part by a vibrating screen, and sending steel slag particles with the particle size of 5-10 mm to the next working procedure for processing;
s03, carrying out stability inspection on the steel slag particles with the particle size of 5-10 mm, jumping to S05 if the steel slag particles are qualified, and carrying out S04 if the steel slag particles are unqualified;
s04, stabilizing the steel slag particles of 5-10 mm to ensure that the f-CaO is fully digested;
s05, feeding the obtained steel slag particles of 5-10 mm into a log washer for cleaning to obtain steel slag aggregate;
s06, screening the cleaned steel slag aggregate to remove irregular particles, wherein the oversize material is the open-graded steel slag aggregate.
On the basis of the technical scheme, the invention can be further improved as follows.
In the above scheme, in S01, the magnetic separation is a combination of belt magnetic separation and belt conveyor head wheel magnetic separation.
In the scheme, in the step S02, steel slag particles with the particle size of more than 10mm are sent to a counterattack type crusher to be crushed for the second time, and the crushed materials are returned to be magnetically separated; steel slag particles with the particle size of less than 5mm are sent into a tailing pond.
In the above embodiment, the stabilizing treatment in S04 is one of an autoclave method, a carbonization method, and an acid hydrolysis method.
In the above scheme, in S06, the device used for screening the cleaned steel slag aggregate is a bar screen.
In the above scheme, the cross section of the screen bar in the bar screen is in one of a rectangular shape, a circular shape, a trapezoidal shape and a Y-shaped shape.
In the scheme, the height of the screen bars in the bar screen is 2-3 mm, the width of the screen bars is 2-3 mm, and the gap between every two adjacent screen bars is 3 mm.
In the scheme, the sieve bars in the bar-shaped sieve are arranged in parallel and welded on the reinforcing ribs below the sieve bars, the cross sections of the reinforcing ribs are rectangular or circular, the height of the reinforcing ribs is 3-5 mm, the width of the reinforcing ribs is 3-5 mm, the reinforcing ribs and the sieve bars are arranged in parallel, and gaps among the reinforcing ribs are 20-40 mm.
The invention has the beneficial effects that:
the steel slag aggregate obtained by the invention has the advantages of low needle and sheet contents, low porosity, good stability, low mud content and the like, compared with the conventional steel slag aggregate, the porosity is reduced by 20 percent, and the steel slag aggregate is used for preparing water permeable brick products, and under the conditions of the same specification and the same mixing ratio, the compressive strength of finished products of the water permeable bricks can be improved by 5-8 Mpa, and the quality is high;
the open-graded steel slag aggregate can replace the conventional open-graded broken stone to prepare the water permeable brick, the price of the steel slag aggregate is far lower than that of the conventional high-quality broken stone, the economic benefit is good, and solid waste resources are also consumed and utilized;
the process is simple, the equipment investment is small, the quality of the steel slag aggregate is improved by optimizing the crushing and screening process, no wastewater is generated in the whole process flow, all materials can be utilized, and no secondary pollution is caused;
the steel slag is used for construction of permeable bricks and sponge cities through a simple secondary processing technology, so that stacking and irregular discharge of solid wastes of the steel slag are reduced, the use of natural resources such as broken stones is reduced, and good social, economic and environmental effects are achieved.
Drawings
FIG. 1 is a flow chart of the method for preparing open-graded steel slag aggregate according to the present invention;
FIG. 2 is a flow chart of a typical steel slag one-time crushing magnetic separation process;
FIG. 3 is a top view of a bar screen;
fig. 4 is a side view of a bar screen.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, fig. 2, fig. 3 and fig. 4, a preparation method of open-graded steel slag aggregate comprises the following steps:
s01, carrying out magnetic separation on the steel slag with the particle size of 0-40 mm after the steel slag is subjected to primary crushing and iron selection by a jaw crusher, and returning the selected magnetic separation material to the sintering or steel-making process for use;
s02, classifying the non-magnetic separated part by a vibrating screen, and sending steel slag particles with the particle size of 5-10 mm to the next working procedure for processing;
s03, carrying out stability inspection (YB/T4228) on the steel slag particles with the particle size of 5-10 mm, jumping to S05 if the steel slag particles are qualified, and carrying out S04 if the steel slag particles are not qualified;
s04, stabilizing the steel slag particles of 5-10 mm to ensure that the f-CaO is fully digested;
s05, feeding the obtained steel slag particles of 5-10 mm into a log washer for cleaning to obtain steel slag aggregate;
s06, screening the cleaned steel slag aggregate to remove irregular particles, wherein the oversize material is the open-graded steel slag aggregate.
In step S01, the steel slag is preferably converter slag or electric slag, the steel slag is solid waste of metallurgical slag obtained by treating hot slag in a steel making process through slag treatment processes such as a hot splashing method, a hot braising method and a roller method and cooling, and in step S01, the magnetic separation is a combination of belt magnetic separation and belt conveyor head wheel magnetic separation.
In the S02, steel slag particles with the particle size of more than 10mm are sent to a counterattack type crusher through a belt for secondary crushing, and the crushed materials are magnetically separated again before returning to a magnetic separation belt; steel slag particles with a particle size of less than 5mm are fed into a tailings silo, and the vibrating screen is usually a square-hole screen.
In S04, the stabilizing treatment is one of an autoclave method, a carbonization method, and an acidolysis method.
In S06, the equipment used for screening the cleaned steel slag aggregate is a strip-shaped sieve, and in addition, in S06, the waste material is arranged below the strip-shaped sieve and is sent to a tailings warehouse. The grain size of the open-graded steel slag aggregate in S06 is 5-10 mm, the open-graded steel slag aggregate is mainly used for preparing water permeable bricks, and tailings, tailings and waste materials obtained in other steps can be sent to a cement plant to be used as raw materials.
The cross section of each screen bar in the bar-shaped screen is rectangular, circular, trapezoidal and Y-shaped, the height of each screen bar in the bar-shaped screen is 2-3 mm, the width of each screen bar is 2-3 mm, the gap between every two adjacent screen bars is 3mm, the screen bars are arranged in parallel in the bar-shaped screen and welded on the reinforcing ribs below the screen bars, the cross sections of the reinforcing ribs are rectangular or circular, the height of each reinforcing rib is 3-5 mm, the width of each reinforcing rib is 3-5 mm, the reinforcing ribs are arranged in parallel with the direction of the screen bars, and the gaps between the reinforcing ribs are 20-40 mm.
The impact crusher adopts the impact crusher as secondary crushing process equipment, the impact crusher utilizes the plate hammer on the rotor rotating at high speed to impact and crush the materials fed into the crushing cavity at high speed, the impact crusher belongs to impact type crushing, the materials are discharged after being impacted by the plate hammer for multiple times, and needle and flaky particles are not easy to generate. The jaw crusher mainly utilizes two jaw plates to extrude a material to form crushing, belongs to extrusion type crushing, is easy to generate needle and flaky particles in the extrusion process, and has the inherent defects of the jaw crusher, but the jaw crusher has high yield, wide adaptability and low energy consumption, is suitable for primary coarse crushing, utilizes impact crushing to secondarily crush steel slag particles of the steel slag after jaw crushing, and simultaneously has good reshaping effect on the steel slag particles.
The national standard GB/T14685 defines that needle-shaped particles are formed when the length of aggregate particles in the aggregate is 2.4 times larger than the average particle size of the corresponding size fraction to which the particles belong, flaky particles are formed when the thickness of the aggregate particles is 0.4 times smaller than the average particle size, the average particle size of the aggregate particles in the size fraction of 5-10 mm is 7.5mm, the spacing between the screen bars of the bar-shaped screen is 3mm, the spacing between the reinforcing ribs is 20-40 mm, the needle-shaped and flaky particles in the aggregate can be effectively filtered, and the level of the needle-shaped and flaky particles in the aggregate is further reduced.
Example 1:
the steel slag raw material is converter slag, the converter slag is treated by a hot splashing method, the cooled raw slag is subjected to magnetic separation to separate large slag steel, and the large slag steel is subjected to primary crushing by a jaw crusher and then is classified (a typical process is shown in figure 2) to obtain the steel slag with the thickness of 0-40 mm.
The steel slag stabilizing process is an autoclave method and adopts the principle that high-pressure steam is utilized to quickly react f-CaO in the steel slag with H2Reaction of O to Ca (OH)2To realize the digestion of the aggregate, thereby improving the volume stability of the aggregateAnd (4) sex.
A preparation method of open-graded steel slag aggregate comprises the following steps:
1) carrying out magnetic separation on the steel slag with the particle size of 0-40 mm after primary crushing by using a belt magnetic separation and belt conveyor head wheel magnetic machine through a belt, and returning the selected magnetic separation material to the sintering or steelmaking process for use;
2) grading the part which is not magnetically separated by a vibrating screen (a square hole screen), conveying the particles with the particle size of more than 10mm into a reaction crusher by a belt for secondary crushing, and returning the crushed material to the front of a magnetic separation belt; feeding particles with the particle size of less than 5mm into a tailing pond; 5-10 mm of particles are sent to the next working procedure for processing;
3) stabilizing the steel slag by adopting a pressure steaming process, sending 5-10 mm steel slag particles into a steam kiln for treatment, wherein the steam pressure is 2.0Mpa, the pressure steaming time is 3 hours, so that f-CaO is fully digested, and taking the steel slag out of the steam kiln after the pressure steaming is finished;
4) conveying the steel slag with the thickness of 5-10 mm obtained in the last step into an ore washer for cleaning, conveying cleaning wastewater into a sedimentation tank, returning supernatant after sedimentation to the ore washer for utilization, taking out bottom tailing mud through a grab bucket, and conveying the bottom tailing mud to a tailing pond;
5) enabling the cleaned steel slag aggregate to pass through a bar-shaped sieve, wherein the cross section of each sieve bar in the bar-shaped sieve is circular, the diameter of each sieve bar is about 2.5mm, the gap between the sieve bars is 3mm, the cross section of each reinforcing rib is circular, the diameter of each reinforcing rib is about 4mm, and the gap between the reinforcing ribs is 25 mm; conveying the oversize materials to a product warehouse through a belt;
6) collecting the oversize material of the bar-shaped sieve, namely the open-graded steel slag aggregate.
Example 2:
the steel slag raw material is converter slag, the converter slag is treated by a hot-braising method, the cooled raw slag is subjected to magnetic separation to separate large slag steel, and the large slag steel is subjected to primary crushing by a jaw crusher and then is classified (the typical process is shown in figure 2) to obtain the steel slag with the thickness of 0-40 mm.
The steel slag stabilizing process is a carbonization method, and the principle is that CO is utilized for a slightly humid steel slag sample2The gas pair reacts with f-CaO in the steel slag rapidlyTo CaCO3The digestion is realized, and the volume stability of the aggregate is improved.
A preparation method of open-graded steel slag aggregate comprises the following steps:
1) carrying out magnetic separation on the steel slag with the particle size of 0-40 mm after primary crushing and iron selection by using a belt magnetic separation and belt conveyor head wheel magnetic machine, and returning the selected magnetic separation material to the sintering or steel-making process for use;
2) grading the part which is not magnetically separated by a vibrating screen (a square hole screen), conveying the particles with the particle size of more than 10mm into a reaction crusher by a belt for secondary crushing, and returning the crushed material to the front of a magnetic separation belt; feeding particles with the particle size of less than 5mm into a tailing pond; 5-10 mm of particles are sent to the next working procedure for processing;
3) stabilizing the steel slag by adopting a carbonization process, spraying water to wet 5-10 mm steel slag particles, sending the steel slag particles into a carbonization chamber, closing a chamber door, and introducing CO2Gas, make CO2Partial pressure reaches 0.2Mpa, carbonization time is 2.5h, f-CaO is fully digested, and after carbonization is finished, the steel slag is taken out of a carbonization chamber;
4) conveying the steel slag with the thickness of 5-10 mm obtained in the last step into an ore washer for cleaning, conveying cleaning wastewater into a sedimentation tank, returning supernatant after sedimentation to the ore washer for utilization, taking out bottom tailing mud through a grab bucket, and conveying the bottom tailing mud to a tailing pond;
5) enabling the cleaned steel slag aggregate to pass through a bar-shaped sieve, wherein the cross section of each sieve bar in the bar-shaped sieve is rectangular, the width of each sieve bar is about 2mm, the height of each sieve bar is 3mm, the gap between the sieve bars is 3mm, the cross section of each reinforcing rib is square, the side length of each reinforcing rib is about 5mm, and the gap between the reinforcing ribs is 30 mm; conveying the oversize materials to a product warehouse through a belt;
6) collecting the oversize material of the bar-shaped sieve, namely the open-graded steel slag aggregate.
Example 3:
the steel slag raw material is converter slag, the converter slag is treated by a roller method, the cooled raw slag is subjected to magnetic separation to separate large slag steel, and the large slag steel is subjected to primary crushing by a jaw crusher and then is classified (the typical process is shown in figure 2) to obtain the steel slag with the thickness of 0-40 mm.
The steel slag stabilizing process is an acidolysis method, and the principle is that weak acid is utilized to accelerate the hydration of the steel slag and convert the steel slag into salt, for example, dilute sulfuric acid can be used to enable f-CaO in the steel slag to rapidly react to generate CaSO4The mother liquor can be evaporated and crystallized to obtain gypsum, the acid liquor can be recycled, and the volume stability of the aggregate after the steel slag is digested is improved.
A preparation method of open-graded steel slag aggregate comprises the following steps:
1) carrying out magnetic separation on the steel slag with the particle size of 0-40 mm after primary crushing and iron selection by using a belt magnetic separation and belt conveyor head wheel magnetic machine, and returning the selected magnetic separation material to the sintering or steel-making process for use;
2) grading the part which is not magnetically separated by a vibrating screen (a square hole screen), conveying the particles with the particle size of more than 10mm into a reaction crusher by a belt for secondary crushing, and returning the crushed material to the front of a magnetic separation belt; feeding particles with the particle size of less than 5mm into a tailing pond; 5-10 mm of particles are sent to the next working procedure for processing;
3) stabilizing the steel slag by adopting an acidolysis process, feeding 5-10 mm steel slag particles into an acid leaching tank, diluting the acid leaching tank by using a byproduct, namely waste sulfuric acid generated by a sintering flue gas activated carbon desulfurization process, as a raw material, adding water to the acid leaching tank until the pH value is about 2-3, keeping the acidity, allowing the steel slag particles to stay in the acid leaching tank for 15min, and feeding the steel slag subjected to acidolysis into a cleaning process; mother liquor in the acid leaching tank is sent into an evaporation crystallizer to obtain gypsum crystals, and evaporated water vapor returns to the acid leaching tank after being cooled to prepare dilute sulfuric acid for use;
4) conveying the steel slag with the thickness of 5-10 mm obtained in the last step into an ore washer for cleaning, conveying cleaning wastewater into a sedimentation tank, returning supernatant after sedimentation to the ore washer for utilization, taking out bottom tailing mud through a grab bucket, and conveying the bottom tailing mud to a tailing pond;
5) enabling the cleaned steel slag aggregate to pass through a bar-shaped sieve, wherein the cross section of a sieve bar in the bar-shaped sieve is trapezoidal, the top width is 3mm, the bottom width is 2mm, the height is 3mm, a gap between the sieve bars is 3mm, the cross section of a reinforcing rib is rectangular, the width is 5mm, the height is 3mm, and a gap between the reinforcing ribs is 35 mm; conveying the oversize materials to a product warehouse through a belt;
6) collecting the oversize material of the bar-shaped sieve, namely the open-graded steel slag aggregate.
Example 4:
the steel slag raw material is electric furnace slag, the electric furnace slag is treated by a hot splashing method, the cooled raw slag is subjected to magnetic separation to separate large slag steel, and the large slag steel is subjected to primary crushing by a jaw crusher and then is classified (a typical process is shown in figure 2) to obtain the steel slag with the thickness of 0-40 mm.
Because the electric furnace slag has no bad stability, the electric furnace slag is not treated by a stabilizing process.
A preparation method of open-graded steel slag aggregate comprises the following steps:
1) carrying out magnetic separation on the steel slag with the particle size of 0-40 mm after primary crushing and iron selection by using a belt magnetic separation and belt conveyor head wheel magnetic machine, and returning the selected magnetic separation material to the sintering or steel-making process for use;
2) grading the part which is not magnetically separated by a vibrating screen (a square hole screen), conveying the particles with the particle size of more than 10mm into a reaction crusher by a belt for secondary crushing, and returning the crushed material to the front of a magnetic separation belt; feeding particles with the particle size of less than 5mm into a tailing pond; 5-10 mm of particles are sent to the next working procedure for processing;
3) conveying the steel slag with the thickness of 5-10 mm obtained in the last step into an ore washer for cleaning, conveying cleaning wastewater into a sedimentation tank, returning supernatant after sedimentation to the ore washer for utilization, taking out bottom tailing mud through a grab bucket, and conveying the bottom tailing mud to a tailing pond;
4) enabling the cleaned steel slag aggregate to pass through a bar-shaped sieve, wherein the cross section of a sieve bar in the bar-shaped sieve is Y-shaped, the top width is 3mm, the bottom width is 2mm, the height is 3mm, a gap between the sieve bars is 3mm, the cross section of a reinforcing rib is circular, the diameter is about 4mm, the gap between the reinforcing ribs is 25mm, and after steel slag particles pass through the sieve surface, irregular particles are leaked from sieve holes and are sent to a tailings warehouse as waste materials; conveying the oversize materials to a product warehouse through a belt;
5) collecting the oversize material of the bar-shaped sieve, namely the open-graded steel slag aggregate.
Example 5:
the steel slag raw material is converter slag, the converter slag is treated by a fourth generation pressure waste heat thermal stewing method, the cooled raw slag is subjected to magnetic separation to separate large slag steel, and the large slag steel is subjected to primary crushing by a jaw crusher and then is classified (a typical process is shown in figure 2) to obtain the steel slag with the thickness of 0-40 mm.
Because the fourth generation pressure waste heat thermal stewing method has higher treatment efficiency on the f-CaO in the steel slag, the stability of the steel slag with the thickness of 5-10 mm is detected according to YB/T4228 before the stabilization treatment process, and the result is qualified, so the stabilization process treatment is not adopted
A preparation method of open-graded steel slag aggregate comprises the following steps:
1) carrying out magnetic separation on the steel slag with the particle size of 0-40 mm after primary crushing and iron selection by using a belt magnetic separation and belt conveyor head wheel magnetic machine, and returning the selected magnetic separation material to the sintering or steel-making process for use;
2) grading the part which is not magnetically separated by a vibrating screen (a square hole screen), conveying the particles with the particle size of more than 10mm into a reaction crusher by a belt for secondary crushing, and returning the crushed material to the front of a magnetic separation belt; feeding particles with the particle size of less than 5mm into a tailing pond; 5-10 mm of particles are sent to the next working procedure for processing;
3) conveying the steel slag with the thickness of 5-10 mm obtained in the last step into an ore washer for cleaning, conveying cleaning wastewater into a sedimentation tank, returning supernatant after sedimentation to the ore washer for utilization, taking out bottom tailing mud through a grab bucket, and conveying the bottom tailing mud to a tailing pond;
4) enabling the cleaned steel slag aggregate to pass through a bar-shaped sieve, wherein the cross section of each sieve bar in the bar-shaped sieve is circular, the diameter of each sieve bar is about 2.8mm, the gap between the sieve bars is 3mm, the cross section of each reinforcing rib is circular, the diameter of each reinforcing rib is about 4mm, and the gap between the reinforcing ribs is 30 mm; conveying the oversize materials to a product warehouse through a belt;
5) collecting the oversize material of the bar-shaped sieve, namely the open-graded steel slag aggregate.
Comparative example:
the steel slag raw material is converter slag, the converter slag is treated by a fourth generation pressure waste heat thermal stewing method, the cooled raw slag is subjected to magnetic separation to separate large slag steel, and the large slag steel is subjected to primary crushing by a jaw crusher and then is classified (a typical process is shown in figure 2) to obtain the steel slag with the thickness of 0-40 mm.
The steel slag aggregate preparation process by utilizing the steel slag and the conventional method comprises the following steps:
1) carrying out magnetic separation on the steel slag with the particle size of 0-40 mm after primary crushing and iron selection by using a belt magnetic separation and belt conveyor head wheel magnetic machine, and returning the selected magnetic separation material to the sintering or steel-making process for use;
2) grading the part which is not magnetically separated by a vibrating screen (a square hole screen), sending the particles with the particle size of more than 10mm into a cone crusher by a belt for secondary crushing, and returning the crushed material to the front of a magnetic separation belt; feeding particles with the particle size of less than 5mm into a tailing pond; further processing the particles with the particle size of 5-10 mm;
3) conveying the steel slag with the thickness of 5-10 mm obtained in the last step into an ore washer for cleaning, conveying cleaning wastewater into a sedimentation tank, returning supernatant after sedimentation to the ore washer for utilization, taking out bottom tailing mud through a grab bucket, and conveying the bottom tailing mud to a tailing pond;
4) and collecting the cleaned steel slag particles of 5-10 mm to obtain the steel slag aggregate prepared by the conventional method.
Comparing the steel slag aggregate obtained in the example with the steel slag aggregate obtained in the comparative example:
TABLE 1 content of acicular and flaky particles and porosity of examples and comparative examples
As can be seen from Table 1, the needle and flake contents of the steel slag aggregate obtained by the processing of the invention can be reduced to about 1%, and the stacking porosity of the aggregate can be reduced to about 40%. Compared with the conventional steel slag secondary processing method, the method has the advantages of obviously reducing the content of irregular particles such as needles, sheets and the like in the steel slag aggregate, improving the aggregate accumulation level, reducing the steel slag aggregate accumulation porosity and improving the aggregate quality.
Table 2. proportion of water permeable brick prepared by steel slag aggregate in examples and comparative examples and product quality
As can be seen from Table 2, in the examples and the comparative examples, under the same mixing ratio, the steel slag aggregate of the examples has low bulk porosity, and the strength of the obtained permeable brick product 28d is higher than that of the permeable brick product prepared by using the steel slag aggregate of the comparative example, so that the preparation of the high-quality aggregate by the invention can effectively improve the quality of the permeable brick product.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. The preparation method of the open-graded steel slag aggregate is characterized by comprising the following steps of:
s01, carrying out magnetic separation on the steel slag with the particle size of 0-40 mm after the steel slag is subjected to primary crushing and iron selection by a jaw crusher, and returning the selected magnetic separation material to the sintering or steel-making process for use;
s02, classifying the non-magnetic separated part by a vibrating screen, and sending steel slag particles with the particle size of 5-10 mm to the next working procedure for processing;
s03, carrying out stability inspection on the steel slag particles with the particle size of 5-10 mm, jumping to S05 if the steel slag particles are qualified, and carrying out S04 if the steel slag particles are unqualified;
s04, stabilizing the steel slag particles of 5-10 mm to ensure that the f-CaO is fully digested;
s05, feeding the obtained steel slag particles of 5-10 mm into a log washer for cleaning to obtain steel slag aggregate;
s06, screening the cleaned steel slag aggregate to remove irregular particles, wherein the oversize material is the open-graded steel slag aggregate.
2. The method for preparing open-graded steel slag aggregate according to claim 1, wherein in the step S01, the magnetic separation is a combination of belt type magnetic separation and belt conveyor head wheel magnetic separation.
3. The method for preparing open-graded steel slag aggregate according to claim 1, wherein in S02, steel slag particles with the particle size of more than 10mm are sent to a counterattack crusher for secondary crushing, and the crushed materials are returned for magnetic separation; steel slag particles with the particle size of less than 5mm are sent into a tailing pond.
4. The method as claimed in claim 1, wherein the stabilizing treatment in S04 is one of autoclaving, carbonization and acidolysis.
5. The method of claim 4, wherein in S06, the steel slag aggregate after washing is screened by a bar screen.
6. The method of claim 5, wherein the cross-sectional shape of the screen bar of the bar screen is one of rectangular, circular, trapezoidal and Y-shaped.
7. The method for preparing the open-graded steel slag aggregate according to claim 6, wherein the height of the screen bars in the bar screen is 2-3 mm, the width of the screen bars is 2-3 mm, and the gap between two adjacent screen bars is 3 mm.
8. The method according to claim 7, wherein the screen bars of the bar screen are arranged in parallel and welded to the reinforcing ribs thereunder, the reinforcing ribs have a rectangular or circular cross section, a height of 3 to 5mm and a width of 3 to 5mm, and are arranged in parallel with the screen bar direction, and gaps between the reinforcing ribs are 20 to 40 mm.
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