阅读说明：本技术 一种锰硅渣制备多孔轻质细集料和微粉的方法及应用 (Method for preparing porous light fine aggregate and micro powder from manganese-silicon slag and application ) 是由 莫军红 乌鹏飞 张素娴 张思奇 倪文 杨佳庆 张彦斌 于 2020-12-03 设计创作，主要内容包括：本发明涉及一种锰硅渣制备多孔轻质细集料和微粉的方法,将锰硅合金热熔渣经过水淬处理、干燥处理、粉碎、多级筛分后得到细度模数为3.0-1.5的细集料和锰硅粉末；将前述细集料和锰硅粉末用作混凝土掺和料,有效降低混凝土的质量,有效减少资源浪费,具有良好的节能环保效果,同时为土木建筑工程施工所需的细集料提供了新的原料来源,具有良好的经济效益。(The invention relates to a method for preparing porous light fine aggregate and micro powder from manganese-silicon slag, which comprises the steps of carrying out water quenching treatment, drying treatment, crushing and multi-stage screening on manganese-silicon alloy hot-melt slag to obtain fine aggregate and manganese-silicon powder with fineness modulus of 3.0-1.5; the fine aggregate and the manganese-silicon powder are used as concrete admixture, so that the quality of concrete is effectively reduced, the waste of resources is effectively reduced, the energy-saving and environment-friendly effects are good, a new raw material source is provided for the fine aggregate required by civil engineering and building construction, and the economic benefit is good.)

1. A method for preparing porous light fine aggregate and micropowder by using manganese-silicon slag is characterized by comprising the following preparation processes:

s1, carrying out water quenching treatment on the manganese-silicon alloy hot slag and then drying the manganese-silicon alloy hot slag;

s2, sending the dried manganese-silicon alloy hot-melt slag into a double-roll crusher for primary crushing to obtain primary crushed materials;

s3, feeding the primary crushed aggregates obtained in the step S2 into a first drum screen for primary screening, returning the products on the screen to a roller crusher for secondary crushing, and feeding the products under the screen into secondary screening operation;

s4, sequentially passing the undersize products obtained by primary screening in the step S3 through a plurality of second drum screens with gradually increased meshes for multi-stage screening, feeding the oversize products obtained by each stage of screening into a corresponding aggregate collecting bin for later use, and feeding the undersize products obtained by the last stage of second drum screen into a pulverizer for full grinding to obtain the undersize products with the specific surface area of 400m²/kg-600m²Per kg of manganese-silicon slag micro powder;

s5, grading the corresponding oversize products obtained by multi-stage screening in the step S4 according to a certain proportion to obtain fine aggregates with a certain fineness modulus.

2. The method for preparing porous light fine aggregate and micropowder from manganese silica slag according to claim 1, characterized in that: the aperture of the first trommel in the step S3 is 9.5 mm.

3. The method for preparing porous light fine aggregate and micropowder from manganese silica slag according to claim 1, characterized in that: the aperture of the second trommel sieve in the step S4 is 4.75mm, 2.36mm, 1.18mm, 600 μm, 300 μm and 150 μm in sequence, the particle size of the corresponding product on the sieve is 4.75mm, 2.36mm, 1.18mm, 600 μm, 300 μm and 150 μm in sequence, and the particle size of the product under the sieve obtained by the last stage of second trommel sieve is less than 150 μm.

4. The method for preparing porous light fine aggregate and micropowder from manganese silica slag according to claim 1, characterized in that: the fineness modulus of the fine aggregate obtained in the step S5 is 3.0-1.5.

5. The method for preparing porous light fine aggregate and micropowder from manganese silica slag according to claim 1, characterized in that: when the step S1 is carried out, the manganese-silicon slag is used with the flow rate not less than 965mm³Water quenching is carried out on the water flow per hour to obtain 20-50mm of burst-shaped porous structure materials.

6. Use of porous lightweight fine aggregates prepared by the method of claim 1, characterized in that: the fine aggregate is used in mortar or concrete for civil engineering and construction engineering to replace river sand or washed sand.

7. Use of porous lightweight fine aggregates according to claim 6, characterized in that: the fine aggregate is used for preparing the mortar, the mortar comprises a cementing material, porous light fine aggregate with fineness modulus of 3.0-1.5, a water reducing agent and water, the mass ratio of the cementing material to the porous light fine aggregate is 1: 1-1:4, and the mass ratio of the added water to the cementing material is 0.2-0.6.

8. Use of porous lightweight fine aggregates according to claim 6, characterized in that: the fine aggregate is used for preparing concrete, and the concrete comprises a cementing material and has a specific surface area of 400m²/kg-600m²The manganese-silicon slag-based composite material comprises, by mass, per kg of manganese-silicon slag micro powder, porous light fine aggregate with a fineness modulus of 3.0-1.5, a water reducing agent and coarse aggregate, wherein the tailings, the waste rock and water are used as the water, the mass ratio of the water to the cementing material is 0.32-0.48, the mass ratio of the water reducing agent to the cementing material is 0.1-0.7%, the mass ratio of the porous light fine aggregate to the aggregate is 0.3-0.6, and the addition amount of the manganese-silicon slag micro powder is 0-40%.

9. The application of the manganese-silicon slag micro powder prepared by the method of claim 1 is characterized in that: the manganese-silicon slag micro powder is used as a cement mineral admixture to prepare a cementing material according to the proportion of 0-30% by weight.

Technical Field

The invention belongs to the technical field of manganese-silicon slag treatment, and particularly relates to a method for preparing porous light fine aggregate and micro-powder from manganese-silicon slag and application of the porous light fine aggregate and the micro-powder.

Background

The manganese-silicon alloy is a common compound deoxidizer for steel making, almost all steel grades need to be deoxidized by manganese, the yield of pig iron and crude steel in China is increasing since 2018, and the demand for the manganese-silicon alloy is high. The manganese-silicon alloy slag is blast furnace slag formed by water quenching high-temperature slag discharged in the manganese-silicon alloy smelting process, 1.2-1.3 tons of manganese-silicon alloy slag are generated every 1 ton of manganese-silicon alloy, and a large amount of solid waste becomes a large household with great environmental pollution.

The radioactivity and heavy metal ions of the manganese-silicon slag exceed the standard seriously, so that the comprehensive utilization efficiency is restricted, but with the enhancement of the metallurgical technology, the radioactivity and the radioactivity of the manganese-silicon slag meet the relevant standards, and a prerequisite is provided for the comprehensive utilization of the manganese-silicon slag. In view of the current situation, the comprehensive utilization directions of manganese-silicon alloy slag are various, for example, the doping amount of the manganese-silicon slag in cement production is only 8%, and technologies for producing high-value-added products such as mineral wool and the like are popularized and applied, but are limited in that the manganese-silicon slag consumed by industries is only a small part of the total discharge amount due to factors such as market saturation and the like, but the technologies do not fundamentally consume a large amount of the manganese-silicon slag, so that a large approach for utilizing the manganese-silicon slag is found, and the problem is urgently needed to be solved.

Manganese-silicon slag is used for replacing soil and stone materials to build highway subgrade, subbase, base course and road surface at home and abroad, so that the problem of manganese-silicon slag accumulation can be solved, the exploitation of stone materials can be reduced, the soil and vegetation can be kept, the manganese-silicon slag is used as a fine aggregate in civil engineering construction, and an effective way for utilizing the manganese-silicon slag in large quantities is limited.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a method for preparing porous light fine aggregates and micro powder from manganese-silicon slag, which is used for crushing manganese-silicon slag, then performing multi-stage screening to obtain fine aggregates and manganese-silicon powder with different particle sizes, and performing grading according to different requirements to apply the fine aggregates and manganese-silicon powder to civil engineering and building engineering so as to realize resource utilization of manganese-silicon slag, save energy, protect environment and save economic cost, and an application thereof.

The technical scheme of the invention is as follows:

a method for preparing porous light fine aggregate and micropowder by using manganese-silicon slag comprises the following preparation processes:

s1, carrying out water quenching treatment on the manganese-silicon alloy hot slag and then drying the manganese-silicon alloy hot slag;

s2, sending the dried manganese-silicon alloy hot-melt slag into a double-roll crusher for primary crushing to obtain primary crushed materials;

s3, feeding the primary crushed aggregates obtained in the step S2 into a first drum screen for primary screening, returning the products on the screen to a roller crusher for secondary crushing, and feeding the products under the screen into secondary screening operation;

s4, sequentially passing the undersize products obtained by primary screening in the step S3 through a plurality of second drum screens with gradually increased meshes for multi-stage screening, feeding the oversize products obtained by each stage of screening into a corresponding aggregate collecting bin for later use, and feeding the undersize products obtained by the last stage of second drum screen into a pulverizer for full grinding to obtain the undersize products with the specific surface area of 400m²/kg-600m²Per kg of manganese-silicon slag micro powder;

s5, grading the corresponding oversize products obtained by multi-stage screening in the step S4 according to a certain proportion to obtain fine aggregates with a certain fineness modulus.

Further, the aperture of the first trommel in the step S3 is 9.5 mm.

Further, in the step S4, the aperture of each of the second trommel sieves is 4.75mm, 2.36mm, 1.18mm, 600 μm, 300 μm, and 150 μm in sequence, the particle size of the corresponding product on the sieve is 4.75mm, 2.36mm, 1.18mm, 600 μm, 300 μm, and 150 μm in sequence, and the particle size of the product under the sieve obtained by the last stage of second trommel sieve is smaller than 150 μm.

Further, the fineness modulus of the fine aggregate obtained in the step S5 is 3.0 to 1.5.

Further, when the step S1 is performed, the manganese-silicon slag is used at a flow rate of not less than 965mm³Water quenching is carried out on the water flow per hour to obtain 20-50mm of burst-shaped porous structure materials.

Use of a porous light fine aggregate prepared by the aforementioned method for substituting river sand, washed sand, etc. in mortar or concrete for civil engineering and construction.

Further, the fine aggregate is used for preparing the mortar, the mortar comprises a cementing material, porous light fine aggregate with fineness modulus of 3.0-1.5, a water reducing agent and water, and the mass of the cementing material and the porous light fine aggregate is 1: 1-1:4, and the mass ratio of the added water to the cementing material is 0.2-0.6.

Further, the fine aggregate is used for preparing concrete, the concrete comprises a cementing material, manganese-silicon slag micro powder with the specific surface area of 400m2/kg-600m2/kg, porous light fine aggregate with the fineness modulus of 3.0-1.5, a water reducing agent, coarse aggregate and water, the mass ratio of the water to the cementing material is 0.32-0.48, the mass ratio of the water reducing agent to the cementing material is 0.1-0.7%, the mass ratio of the porous light fine aggregate to the aggregate is 0.3-0.6, and the addition amount of the manganese-silicon slag micro powder is 0-40%.

The application of the manganese-silicon slag micro powder prepared by the method is that the manganese-silicon slag micro powder is used as a cement mineral admixture to prepare a cementing material according to the weight percentage of 0-30%.

Compared with the prior art, the invention has the beneficial effects that:

1. the manganese-silicon slag is subjected to water quenching, primary screening and multistage secondary screening according to requirements to prepare fine aggregates, and the fine aggregates are graded according to requirements and then applied to civil engineering and constructional engineering, so that the phenomena of bleeding, segregation, slurry non-coating and the like in the construction process can be effectively avoided, and the quality of concrete is reduced on the whole;

2. the manganese-silicon slag is subjected to water quenching, primary screening and multistage secondary screening according to requirements to obtain an ultimate undersize product, and the ultimate undersize product is sufficiently ground to obtain manganese-silicon powder which is used as a cementing material to be added into concrete or used as a cement mineral admixture, so that the strength of the concrete can be improved to a certain extent;

3. the product obtained after the manganese-silicon slag is treated by the method provided by the invention is used as the raw material of concrete for secondary utilization, so that the resource waste is effectively reduced, the energy-saving and environment-friendly effects are good, a new raw material source is provided for fine aggregates required by civil and architectural engineering construction, and the economic benefit is good;

4. because the fine aggregate accounts for 30-50% of the total amount of the mortar and the concrete, after the manganese-silicon alloy hot-melting slag is fully treated, the oversize fine aggregate is used as the aggregate of the mortar and the concrete, and the undersize product is used as the mineral admixture of the cementing material, so that the comprehensive utilization rate of the manganese-silicon alloy hot-melting slag is effectively improved, and the problem of industrial solid waste stockpiling is effectively solved; in addition, in the whole treatment process of the manganese-silicon alloy hot slag, no secondary solid waste is generated, the environment is not damaged, the mountain excavation and gravel mining are reduced, and the ecological environment is effectively protected.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A method for preparing porous light fine aggregate and micropowder by using manganese-silicon slag comprises the following preparation processes:

s1, carrying out water quenching treatment on the manganese-silicon alloy hot slag and then drying the manganese-silicon alloy hot slag;

s2, sending the dried manganese-silicon alloy hot-melt slag into a double-roll crusher for primary crushing to obtain primary crushed materials;

s3, feeding the primary crushed aggregates obtained in the step S2 into a first drum screen for primary screening, returning the products on the screen to a roller crusher for secondary crushing, and feeding the products under the screen into secondary screening operation;

s4, sequentially passing the undersize products obtained by primary screening in the step S3 through a plurality of second drum screens with gradually increased mesh numbers for multi-stage screening, feeding the oversize products obtained by each stage of screening into a corresponding aggregate collecting bin for later use, feeding the undersize products obtained by the last stage of second drum screen screening into a vertical pulverizer for full grinding for 40-90min to obtain the undersize products with the specific surface area of 400m²/kg-600m²Per kg of manganese-silicon slag micro powder;

s5, grading the corresponding oversize products obtained by multi-stage screening in the step S4 according to a certain proportion to obtain fine aggregates with a certain fineness modulus.

In this embodiment, the aperture of the first trommel in step S3 is 9.5 mm.

In this embodiment, in step S4, the aperture of each of the second trommel sieves is 4.75mm, 2.36mm, 1.18mm, 600 μm, 300 μm, and 150 μm in sequence, the particle size of the corresponding product on the sieve is 4.75mm, 2.36mm, 1.18mm, 600 μm, 300 μm, and 150 μm in sequence, and the particle size of the product under the sieve obtained by the last stage of second trommel sieve is smaller than 150 μm; in specific implementation, the following multi-stage screening mode is adopted:

enabling the undersize product obtained by primary screening to enter a drum screen with 4.75mm screen holes along an inclined hopper, enabling the oversize product to enter an aggregate collection bin, and enabling the undersize product to enter a 2.36mm drum screen along the inclined hopper; the oversize product obtained by screening through a 2.36mm rotary screen enters an aggregate collection bin, and the undersize product enters a 1.18mm rotary screen along an inclined hopper; the oversize product obtained by screening through a 1.18mm rotary screen enters an aggregate collection bin, and the undersize product enters a 600 mu m rotary screen along an inclined hopper; the oversize product obtained by sieving through a 600 mu m rotary screen enters an aggregate collection bin, and the undersize product enters a 300 mu m rotary screen along an inclined hopper; the oversize product obtained by screening through a 300 mu m rotary screen enters an aggregate collection bin, and the undersize product enters a 150 mu m rotary screen along an inclined hopper; the oversize product obtained by screening through a 300 mu m rotary screen enters an aggregate collection bin, and the undersize product enters a 150 mu m rotary screen along an inclined hopper; the oversize product obtained by screening through a 150 mu m rotary screen enters an aggregate collection bin, and the undersize product conveying device enters a pulverizer. .

In this embodiment, the fineness modulus of the fine aggregate obtained in step S5 is 3.0 to 1.5.

In this embodiment, when the step S1 is performed, the Mn-Si slag is used at a flow rate of not less than 965mm³Water quenching is carried out on the water flow per hour to obtain 20-50mm of burst-shaped porous structure materials.

The application of the manganese-silicon slag prepared by the method in preparing porous light fine aggregate, wherein the fine aggregate is used in mortar or concrete for civil engineering and building engineering to replace river sand, washed sand and the like.

The application of the manganese-silicon slag prepared by the method to preparing the porous light fine aggregate is characterized in that the manganese-silicon slag micro powder is used as a cement mineral admixture to prepare a cementing material according to the proportion of 0-30% by weight.

The manganese-silicon slag-based porous lightweight aggregate has the characteristics of light weight, reduction in dead weight of mortar and concrete, good heat preservation and heat insulation effects, internal curing effect, capability of increasing the strength of the mortar or the concrete under the same mixing ratio, reduction in engineering shrinkage cracks and the like; the manganese-silicon slag micro powder is used as a mineral admixture to be added into mortar or concrete, and can improve the strength of the concrete to a certain extent, mainly because a large amount of Ca (OH) is generated when cement is hydrated₂The cement contains 3 to 5 percent of dihydrate gypsum, and the excitants and the manganese-silicon slag ultrafine particles generate secondary reaction to generate a plurality of new substances, so that the strength of the concrete is greatly improved; in addition, the unhydrated ultrafine particles can fill gaps among cement particles and between the cement particles and the fine aggregate, so that the total porosity of the concrete is reduced, the compactness is improved, the strength of the concrete is increased, the dosage of cement in the cementing material is reduced on the premise of ensuring the stability, and the purposes of saving cost and fully utilizing resources are achieved.

Description of the experimental examples:

the fine aggregate and the manganese-silicon powder prepared by the method for preparing the porous light fine aggregate and the micro powder from the manganese-silicon slag are used in the following experimental examples and are tested for corresponding performances;

experimental example 1

According to the manganese-silicon slag after crushing and screening treatment, one of the compositions shown in table 1 is selected as the fine aggregate implemented in the following cases, and the properties of the fine aggregate are detected, and the detection results are shown in table 2.

TABLE 1 manganese-silicon slag grading results

TABLE 2 manganese-silicon slag grading lightweight porous aggregate Properties

The manganese-silicon slag is screened and graded after the roller crusher is crushed, the fineness modulus after grading is 2.8, the manganese-silicon slag belongs to medium sand, and the property detection after grading meets the building sand standard and is suitable for being used as porous light fine aggregate.

Experimental example 2

Preparing the mortar, wherein the mortar comprises a cementing material, porous light fine aggregates with fineness modulus of 2.7, a water reducing agent and water, the mass ratio of the cementing material to the porous light fine aggregates is 1:2, and the mass ratio of the added water to the cementing material is 0.4, wherein the cementing material is P.O 42.5 ordinary portland cement, and the water reducing agent is a solid polycarboxylic acid type high-efficiency water reducing agent; mortar test according to the mix proportion test shown in the table above, the test block is maintained in a standard curing box to the age of 3d, 7d and 28d, and the fracture resistance and the compression strength of the test mortar block are shown in the following table:

TABLE 3 Strength results of mortar samples at various ages

According to the data, under the mixing proportion, the 28d compressive strength of the mortar block can reach 40.3Mpa, and the application requirement is met; the fluidity of the mortar test is executed according to GB/T2419-2005 'method for measuring fluidity of cement mortar', the fluidity of the mortar is 190mm, and the working performance is good.

Experimental example 3

Preparing concrete, wherein the concrete comprises a cementing material, porous light fine aggregates with fineness modulus of 2.6, a water reducing agent, and coarse aggregates, the water and the cementing material are in a mass ratio of 0.43, the water reducing agent and the cementing material are in a mass ratio of 0.5%, the porous light fine aggregates account for 0.4 of the aggregates, the cementing material is P.O 42.5 ordinary portland cement, and the water reducing agent is a solid polycarboxylic acid type high-efficiency water reducing agent; concrete test the test blocks were cured in standard curing boxes to 3d, 7d and 28d ages according to the above mix ratio test, and the compressive strength of the test concrete test blocks is shown in the following table:

TABLE 4 variation of compressive strength of concrete at different mix proportions in different ages

According to the data, the compressive strength of the concrete 28d can reach 79.34MPa under the mixing proportion, and the requirement of C80 is met; the working performance of the concrete is implemented according to GB/T50080-2011 Standard of Performance test method of common concrete mixture, the obtained slump is 185mm, the obtained expansibility is 440mm, and the working performance is good.

Experimental example 4

Preparing concrete, wherein the concrete comprises a cementing material, manganese-silicon slag micro powder with the specific surface area of 500m2/kg, porous light fine aggregates with the fineness modulus of 2.7, a water reducing agent, and coarse aggregates, wherein the coarse aggregates are tailing waste stones and water, the mass ratio of the water to the cementing material is 0.32-0.48, the mass ratio of the water reducing agent to the cementing material is 0.5%, the mass ratio of the porous light fine aggregates to the aggregates is 0.4, and the addition amount of the manganese-silicon slag micro powder is 30%, wherein the cementing material is 70% of P.O 42.5 ordinary portland cement, the water reducing agent is a solid polycarboxylic acid type high-efficiency water reducing agent, and the manganese-silicon slag micro powder is used as a mineral admixture of the cementing material; concrete test the test blocks were cured in standard curing boxes to 3d, 7d and 28d ages according to the above mix ratio test, and the compressive strength of the test concrete test blocks is shown in the following table:

TABLE 5 variation of compressive strength of concrete at different mix proportions in different ages

According to the data, the compressive strength of the concrete 28d can reach 81.56MPa under the mixing proportion, and the requirement of C80 is met; the working performance of the concrete is implemented according to GB/T50080-2011 Standard of Performance test method of common concrete mixture, the obtained slump is 220mm, the expansibility is more than 500mm, and the working performance is good.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.