阅读说明：本技术 一种硅酸镁组分胶凝材料熟料及其制备方法和应用 (Magnesium silicate component cementing material clinker as well as preparation method and application thereof ) 是由 罗利明 彭同江 孙红娟 唐颂 于 2021-09-22 设计创作，主要内容包括：本发明提供了一种硅酸镁组分胶凝材料熟料及其制备方法和应用,所述制备方法包括：将第一配料和第二配料分别进行干燥、破碎和粉磨处理,分别获得第一粉粒体和第二粉粒体,其中,第一配料为含有蛇纹石矿物的原料,第二配料为石灰质原料和黏土质原料中的至少一种；按预定质量比混合第一粉粒体和第二粉粒体,混合均匀后再次粉磨,获得混合物料；煅烧混合物料,获得硅酸镁组分胶凝材料熟料。所述熟料采用如上所述的制备方法制备获得。本发明首次采用纹石矿物为主体组分的原料制备硅酸镁组分胶凝材料熟料,可降低水泥用量,有助于减少碳排量和环境污染,实现含蛇纹石矿物固废的资源化利用。(The invention provides a magnesium silicate component cementing material clinker, a preparation method and an application thereof, wherein the preparation method comprises the following steps: respectively drying, crushing and grinding a first ingredient and a second ingredient to obtain a first powder particle and a second powder particle, wherein the first ingredient is a raw material containing serpentine minerals, and the second ingredient is at least one of a calcareous raw material and a clayey raw material; mixing the first powder and the second powder according to a predetermined mass ratio, uniformly mixing, and then grinding again to obtain a mixed material; calcining the mixed material to obtain the magnesium silicate component cementing material clinker. The clinker is prepared by the preparation method. According to the invention, the magnesium silicate component cementing material clinker is prepared by using the raw material with the serpentine mineral as the main component for the first time, so that the cement consumption can be reduced, the carbon emission and the environmental pollution can be reduced, and the resource utilization of the serpentine mineral-containing solid waste can be realized.)

1. The preparation method of the clinker of the magnesium silicate component cementing material is characterized by comprising the following steps of:

respectively drying, crushing and grinding a first ingredient and a second ingredient to obtain a first powder particle and a second powder particle, wherein the first ingredient is a raw material containing serpentine minerals, and the second ingredient is at least one of a calcareous raw material and a clayey raw material;

mixing the first powder and the second powder according to a predetermined mass ratio, uniformly mixing, and then grinding again to obtain a mixed material;

calcining the mixed material to obtain the magnesium silicate component cementing material clinker.

2. The method for producing a clinker of a magnesium silicate constituent cementitious material according to claim 1, characterised in that the raw material containing serpentine mineral includes at least one of serpentine, serpentine mill tailings, serpentine gangue, chrysotile mill tailings, ultrabedrock type metal mineral mill tailings;

the limestone raw material comprises at least one of sedimentary limestone, metamorphic rocks of sedimentary limestone, sedimentary limestone and tailings formed by the metamorphic rocks of the sedimentary limestone in the process of mine development and processing, wherein the sedimentary limestone comprises at least one of limestone with calcite as a main mineral, siliceous limestone, argillaceous limestone and dolomite to limestone, and the metamorphic rocks of the sedimentary limestone comprise at least one of calcite marlite, dolomite-containing marlite, quartz-containing marlite and limestone-containing marlite;

the clay raw material comprises at least one of tailings and tailings formed in the mine development and processing process of clay rocks, sand-containing clay rocks, mudstone, shale, loess, clay rocks and clay mineral-containing rocks, wherein the clay rocks comprise at least one of kaolin clay rocks, montmorillonite clay rocks and illite clay rocks.

3. The method for preparing the clinker of the magnesium silicate component cementing material according to the claim 1, characterized in that the drying temperature is 60-105 ℃; the adsorbed water content in the first powder and the second powder after drying is lower than 5%.

4. The method for preparing a clinker of a magnesium silicate component cementitious material according to claim 1, wherein the drying, crushing and grinding are performed in a negative pressure environment at a pressure of 5 to 10Pa lower than the external atmospheric pressure.

5. The method for producing a clinker of a magnesium silicate-based cementitious material according to claim 1, wherein the predetermined mass ratio of the powder containing a serpentine mineral, the calcareous raw material powder and the argillaceous raw material powder is 1: (0.1-0.45): (0.05-0.35).

6. The method for preparing a clinker of a magnesium silicate component cementitious material according to claim 1, wherein the calcination temperature is 850 ℃ to 1200 ℃ and the calcination time is 3min to 2.0 h.

7. The method for producing a clinker of a magnesium silicate constituent-based cementitious material according to claim 1, wherein the particle diameters of the first powder and the second powder are both 45 μm to 20 cm; the particle size of the mixed material is 2-100 μm.

8. A magnesium silicate component cement clinker obtained by the production method of the magnesium silicate component cement clinker according to any one of claims 1 to 7.

9. The magnesium silicate component cement clinker of claim 8, wherein the magnesium silicate component cement clinker comprises 25-40% MgO, 38-45% SiO by mass₂、2％～25％CaO、2％～15％Fe₂O₃And 5 to 15 percent of Al₂O₃。

10. Use of the clinker of magnesium silicate cement according to claim 8 as raw material for the preparation of magnesium silicate cement.

Technical Field

The invention relates to the technical field of cementing materials of building material processes, in particular to a magnesium silicate component cementing material clinker, a preparation method of the magnesium silicate component cementing material clinker and application of the magnesium silicate component cementing material clinker.

Background

The magnesium silicate component gel material is a powder material which takes magnesium silicate as a main component and has gelling performance, and plays an important role in the building industry. Such as magnesium silicate cement binding material, is widely applied to civil buildings and common industrial buildings. The implementation of the national novel urbanization plan can continuously promote the application of green building materials, and the utilization of solid waste resources is the key direction for developing the green environment-friendly building material industry.

The magnesium silicate gel material can be prepared by compounding silica fume and magnesium oxide or by using soluble SiO₂Formed by reaction with magnesium oxide. Or by calcining minerals containing oxides of silicon and magnesium, e.g. by calcining magnesite tailings to obtain magnesium oxide, which is further mixed with active SiO₂And preparing the magnesium silicate gel system cement by using a series of additives. The above methods all have problems that magnesium oxide or SiO with high purity and good activity is required in the production process of magnesium silicate gel powder₂As raw materials, the raw materials have high market price, and the production of the raw materials also needs a large amount of energy consumption, thus being not in accordance with the concept of green environmental protection.

Disclosure of Invention

The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, an object of the present invention is to provide a method for producing a low-cost clinker of a magnesium silicate-containing cementitious material, while improving the current situation of the mass accumulation of serpentine-containing mineral solid wastes.

In order to achieve the above object, the present invention provides, in one aspect, a method for preparing a clinker of a magnesium silicate component cementitious material, the method comprising the steps of:

respectively drying, crushing and grinding a first ingredient and a second ingredient to obtain a first powder particle and a second powder particle, wherein the first ingredient is a raw material containing serpentine minerals, and the second ingredient is at least one of a calcareous raw material and a clayey raw material;

mixing the first powder and the second powder according to a predetermined mass ratio, uniformly mixing, and then grinding again to obtain a mixed material;

calcining the mixed material to obtain the magnesium silicate component cementing material clinker.

In one exemplary embodiment of the method for producing a clinker of a magnesium silicate component cementitious material of the present invention, the serpentine mineral-containing raw material may include at least one of serpentine, serpentine mill tailings, serpentine gangue, chrysotile mill tailings, ultrabedrock type metal mineral mill tailings;

the limestone base material soluble comprises at least one of sedimentary limestone, metamorphic rock of sedimentary limestone, sedimentary limestone and tailings formed by metamorphic rock of sedimentary limestone in the process of mine development and processing, wherein the sedimentary limestone comprises at least one of limestone with calcite as a main mineral, siliceous limestone, argillaceous limestone and dolomite to limestone, and the metamorphic rock of sedimentary limestone comprises at least one of calcite marlite, dolomitic marlite, quartz-containing marlite and wollastonite-containing marlite;

the clay raw material is soluble and comprises at least one of tailings and tailings formed in the mine development and processing process of clay rocks, sand-containing clay rocks, mudstone, shale, loess, clay rocks and clay mineral-containing rocks, wherein the clay rocks comprise at least one of kaolin clay rocks, montmorillonite clay rocks and illite clay rocks.

In an exemplary embodiment of the method for preparing the clinker of the magnesium silicate component cementitious material of the present invention, the drying temperature may be 60 to 105 ℃; the adsorbed water content in the first powder and the second powder after drying is lower than 5%.

In an exemplary embodiment of the method for preparing the clinker of the magnesium silicate component cementing material, the drying, crushing and grinding treatment can be completed in a negative pressure environment with the pressure 5-10 Pa lower than the external atmospheric pressure.

In an exemplary embodiment of the method for producing a clinker of a magnesium silicate component cementitious material of the present invention, the predetermined mass ratio of the serpentine mineral-containing powder, the calcareous raw material powder and the argillaceous raw material powder may be 1: (0.1-0.45): (0.05-0.35).

In one exemplary embodiment of the method for preparing the clinker of the magnesium silicate component cementitious material of the present invention, the calcination temperature may be 850 ℃ to 1200 ℃ and the calcination time may be 3min to 2.0 h.

In one exemplary embodiment of the method for manufacturing a clinker of a magnesium silicate component cement of the present invention, the first powder and the second powder may have a particle size of 45 μm to 20cm, and the mixed material may have a particle size of 2 μm to 100 μm.

The invention also provides a clinker of the magnesium silicate component cementing material, which is prepared by the preparation method of the clinker of the magnesium silicate component cementing material.

In an exemplary embodiment of the magnesium silicate component cement clinker of the present invention, the magnesium silicate component cement clinker may include 25% to 40% MgO, 38% to 45% SiO, in mass percentage₂、2％～25％CaO、2％～15％Fe₂O₃And 5 to 15 percent of Al₂O₃。

In a further aspect, the invention provides the use of the clinker of magnesium silicate cement as described above as a raw material for the preparation of magnesium silicate cement.

Compared with the prior art, the beneficial effects of the invention comprise at least one of the following:

(1) the invention carries out phase detoxification treatment on dangerous solid waste containing serpentine minerals, and carries out roasting and phase inversion detoxification treatment on asbestos-containing waste, thereby realizing resource utilization of various asbestos-containing waste, and having important ecological and sustainable development significance on resource protection, saving and high-value utilization;

(2) the invention carries out waste treatment on dangerous solid waste containing serpentine minerals, and has important ecological and environmental significance on the safety of tailings reservoirs, environmental protection, utilization of waste resources and the like;

(3) the production process is simple, safe and environment-friendly, the components, the structure, the appearance and the performance of the asbestos mineral are completely changed by heating and calcining the dangerous solid waste containing the serpentine mineral, and the asbestos mineral is prepared into the clinker of the magnesium silicate component cementing material, so that the waste is changed into valuable;

(4) the magnesium silicate component cementing material clinker is used, so that the source and the range of the cementing material are expanded, the domestic infrastructure construction is promoted, the increasingly tense contradiction of building materials in the urbanization process is effectively relieved, the application of the magnesium cementing material is promoted, and the solid waste material recycling policy advocated and popularized by the nation is responded actively;

(5) according to the invention, the magnesium silicate component cementing material clinker is prepared by using the raw material with the serpentine mineral as the main component for the first time, so that the cement consumption can be reduced, the carbon emission and the environmental pollution can be reduced, the resource utilization of the serpentine mineral-containing solid waste can be realized, the environment can be protected, the land resource can be saved, a new thought can be provided for the non-toxic and harmless treatment of the hazardous waste, and the important ecological, environmental, economic and social benefits can be realized.

Detailed Description

Hereinafter, the magnesium silicate component cement clinker of the present invention, its preparation method and use will be described in detail with reference to the exemplary examples.

It should be noted that "first," "second," and the like are merely for convenience of description and for ease of distinction, and are not to be construed as indicating or implying relative importance. For those of ordinary skill in the art, the term "pressure" in part herein corresponds to pressure.

At present, domestic construction is in vogue, a large amount of inorganic cementing materials are needed, domestic mainstream inorganic cementing materials are mainly calcium cementing materials, and the product type is single. The magnesium gel material represented by magnesium silicate has excellent service performance, but the market price of the raw materials for preparing the magnesium gel material is higher, and a large amount of energy consumption is required for producing the raw materials, so that the magnesium gel material does not accord with the concept of environmental protection.

Meanwhile, the accumulation of a large amount of domestic serpentine mineral-containing solid wastes brings serious influence and harm to the environment, and the serpentine mineral is an important raw material of the magnesium silicate cementing material, so that a large amount of land resources are occupied while the accumulation of the serpentine mineral is carried out, and idle waste of resources is also caused.

In order to change the current situation, the invention provides a method for preparing a clinker of a magnesium silicate component cementing material by using a raw material with serpentine mineral as a main component. The method not only can improve the current situation of mass accumulation of the serpentine mineral-containing solid wastes, but also can produce the magnesium silicate component cementing material clinker with low price, thereby providing a new idea for preparing the magnesium silicate cementing material.

In order to achieve the above object, the present invention provides, in one aspect, a method for preparing a clinker of a magnesium silicate component cementitious material.

In one exemplary embodiment of the method for preparing a clinker of magnesium silicate component cement of the present invention, a method for preparing a clinker of magnesium silicate component cement may include the steps of:

(1) and respectively drying, crushing and grinding the first ingredient and the second ingredient to respectively obtain a first powder particle and a second powder particle. Wherein the first ingredient is a raw material containing serpentine minerals, and the second ingredient comprises a calcareous raw material and a clayey raw material. That is, after drying, crushing and grinding, a serpentine mineral-containing powder, a calcareous material powder and a argillaceous material powder can be obtained, respectively.

The raw material containing the serpentine mineral can comprise at least one of serpentine, serpentine tailings, serpentine waste rock, chrysotile tailings and super-bedrock metal mineral tailings.

The main mineral composition of the obtained serpentine mineral-containing powder and granule is serpentine, and the serpentine contains a small amount of but not limited to talc, magnetite, chlorite, magnesite, olivine, pyroxene and the like. The serpentine mineral-containing powder can comprise 25-40% of MgO and 35-40% of SiO by mass percentage₂、2％～10％CaO、5％～15％Fe₂O₃、1％～5％Al₂O₃And 8% -15% of H₂O⁺. The particle size of the serpentine mineral-containing powder can be 45-20 cm.

The limestone raw material soluble comprises at least one of sedimentary limestone taking calcium carbonate as a main component, metamorphic rock of the sedimentary limestone, sedimentary limestone and tailings formed in the process of mine development and processing of the metamorphic rock of the sedimentary limestone. Wherein the sedimentary limestone comprises at least one of limestone with calcite as a main mineral, siliceous limestone containing impurities, argillaceous limestone and dolomite to limestone. The metamorphic rock of sedimentary limestone includes at least one of calcite marble rock, dolomite marble rock, quartz marble rock, and wollastonite marble-containing marble rock. The particle size of the calcareous raw material powder can be 45-20 cm.

The clay raw material is soluble and comprises at least one of clay rock taking clay minerals as main components, sand-containing clay rock containing more clay minerals, mudstone, shale, loess, clay rock and tailings formed in the mine development and processing process of the rock containing more clay minerals. Wherein the clay mineral-based clay rock comprises at least one of kaolin clay rock, montmorillonite clay rock and illite clay rock. The particle size of the clay raw material powder can be 45-20 cm.

Before crushing, drying treatment is carried out, wherein the drying temperature can be 60-105 ℃, so as to remove the adsorption water of the raw material containing serpentine minerals, the calcareous raw material and the clay raw material. The content of adsorbed water in the dried powder is less than 5%. Excessive water is not beneficial to further crushing and smashing of the sample, especially clay raw materials, and excessive water can lead the clay raw materials to be wrapped on crushing and smashing equipment, so that the crushing and smashing effect is seriously affected. The adsorption water content is lower than 5%, which is beneficial to crushing and roasting detoxification of tailings in the roasting process; if the water content of the adsorbed water exceeds 5%, the water is evaporated to consume heat, thereby affecting the combustion effect of the mixed material in the calcining furnace in the step (2).

Further, the drying temperature can be 90-105 ℃; the content of the absorbed water in the dried powder containing serpentine minerals, the calcareous raw material powder and the argillaceous raw material powder can be 0.5-1%.

In addition, the drying, crushing and grinding treatment can be completed in a negative pressure environment with the pressure 5-10 Pa lower than the external atmospheric pressure, and the pollution to the external air is avoided. The negative pressure can let the fresh air of workshop outside flow in, and the dust that contains asbestos fibre in the workshop discharges fixed place through special dust extraction, can not discharge outside the workshop to reduce environmental pollution. If the negative pressure is more than 10Pa, the negative pressure environment can affect the health of staff, and meanwhile, the air flowing speed in a workshop is increased, so that dust is easy to fly, and indoor air cannot be supplemented in time, so that the negative pressure environment is in a slight vacuum state. If the negative pressure is less than 5Pa, the negative pressure effect is poor.

(2) Mixing a first powder (namely, a powder containing serpentine minerals) and a second powder (namely, a calcareous material powder and a argillaceous material powder) according to a predetermined mass ratio, uniformly mixing, and then grinding again to obtain a mixed material.

Wherein the granularity of the required ingredients is matched with the granularity of the clinker of the magnesium silicate component cementing material, and the specific mesh number is-500 meshes to-100 meshes. If the particle size of the clay raw material powder is too large, the gelation performance of clinker is influenced, and if the particle size of the lime raw material and the serpentine-containing mineral raw material is too large, the use effect of subsequent products, such as flatness and the like, is influenced; if the particle size is too small, the requirements on ore grinding equipment and ore grinding environment are high, the cost is high, and if the particle size of the calcareous raw material and the serpentine-containing mineral raw material is too small, the mechanical property of the material is poor. Here, plus minus or plus sign before a mesh indicates whether or not the mesh of the mesh can be missed, minus number indicates that the mesh of the mesh can be missed, i.e. the particle size is smaller than the mesh size, plus number indicates that the mesh of the mesh cannot be missed, i.e. the particle size is larger than the mesh size; for example, -100 mesh means 100 mesh or less.

The particle size of the obtained mixture is 2 μm to 100 μm, for example, the particle size of the mixture may be 5 μm, 20 μm, 50 μm, 70 μm, 85 μm, 95 μm, or the like.

The predetermined mass ratio of the serpentine mineral-containing powder, the calcareous raw material powder and the argillaceous raw material powder may be 1: (0.1-0.45): (0.05-0.35). For example, the predetermined mass ratio of the serpentine mineral-containing powder, the calcareous material powder, and the argillaceous material powder may be set to 1: 0.1: 0.1, 1: 0.2: 0.15, 1: 0.3: 0.1, 1: 0.1: 0.25, 1: 0.4: 0.3, etc. The best gelling performance can be achieved by matching the calcareous raw material and the clay raw material, and if the calcareous raw material and the clay raw material are lower than the lower limit of a parameter range (for example, when the predetermined mass ratio of the powder containing serpentine mineral, the powder of the calcareous raw material and the powder of the clay raw material is 1: 0.05: 0.01), the prepared magnesium silicate component gelling material has poor clinker performance and cannot meet industrial application; if the usage amount of the calcareous material and the argillaceous material exceeds the upper limit of the parameter range (for example, when the predetermined mass ratio of the powdery particles containing the serpentine mineral, the powdery particles of the calcareous material and the powdery particles of the argillaceous material is 1: 0.9: 0.81), the utilization rate of tailings or tailings resources containing the serpentine mineral is low, and the large-scale comprehensive utilization of the tailings or tailings resources cannot be realized.

(3) Calcining the mixed material to obtain the magnesium silicate component cementing material clinker.

The calcining furnace can comprise a vertical kiln, a rotary kiln, a predecomposition kiln, a suspension kiln and the like, the calcining temperature can be 850-1200 ℃, and the calcining time can be 3 min-2.0 h. For example, the calcination temperature may be 900 deg.C, 1000 deg.C, 1100 deg.C, 1200 deg.C, etc., and the calcination time may be 5min, 15min, 35min, 45min, 60min, 75min, 90min, 105min, etc.

The calcination temperature is 850-1200 ℃, and the calcination time is 3 min-2.0 h. In the temperature range, a better sintering effect can be achieved, so that the product obtained after calcination has high activity and good gelling property. When the temperature is lower than the above temperature (for example, when the calcination temperature is 400 ℃), the calcination effect is poor, the activity of the product is low, and the gelling property is poor, whereas when the temperature is higher than the above temperature (for example, when the calcination temperature is 1600 ℃), the energy is easily consumed, the activity of the powder is reduced, and the product performance and the use quality are poor, so that the above-mentioned optimal calcination temperature range exists. The same is true for the calcination time, and if the calcination time is too low (for example, the calcination time is 1 min), the calcination effect cannot be achieved; the too long time (for example, when the calcination time is 4 h), energy consumption is caused, the over calcination is easily caused, the activity of the powder is reduced, and the optimal effect is not achieved.

In still another exemplary embodiment of the method for preparing a clinker of magnesium silicate component cement of the present invention, a method for preparing a clinker of magnesium silicate component cement may comprise the steps of:

(1) and respectively drying, crushing and grinding the first ingredient and the second ingredient to respectively obtain a first powder particle and a second powder particle. Wherein the first ingredient is a raw material containing serpentine minerals, and the second ingredient is a calcareous raw material. That is, after drying, crushing and pulverizing, a powdery or granular body containing a serpentine mineral and a powdery or granular body of a calcareous material can be obtained, respectively.

(2) Mixing the powder containing the serpentine mineral and the calcareous raw material powder according to a preset mass ratio, uniformly mixing, and then grinding again to obtain a mixed material with the particle size of 2-100 mu m. The predetermined mass ratio of the serpentine mineral-containing powder to the calcareous material powder to the argillaceous material powder may be 1: (0.1-0.45).

(3) Calcining the mixed material to obtain the magnesium silicate component cementing material clinker. The calcining temperature can be 850-1200 ℃, and the calcining time can be 3 min-2.0 h.

In still another exemplary embodiment of the method for preparing a clinker of magnesium silicate component cement of the present invention, a method for preparing a clinker of magnesium silicate component cement may include the steps of:

(1) and respectively drying, crushing and grinding the first ingredient and the second ingredient to respectively obtain a first powder particle and a second powder particle. Wherein the first ingredient is a raw material containing serpentine minerals, and the second ingredient is a clay raw material. That is, after drying, crushing and pulverizing, a powder containing serpentine mineral and a clay-based raw material powder can be obtained, respectively.

(2) Mixing the powder containing the serpentine mineral and the clay raw material powder according to a preset mass ratio, uniformly mixing, and then grinding again to obtain a mixed material with the particle size of 2-100 mu m. The predetermined mass ratio of the serpentine mineral-containing powder to the argillaceous raw material powder may be 1: (0.05-0.35).

(3) Calcining the mixed material to obtain the magnesium silicate component cementing material clinker. The calcining temperature can be 850-1200 ℃, and the calcining time can be 3 min-2.0 h.

The invention relates to a method for preparing serpentine mineral waste, which comprises serpentine, serpentine mineral processing tailings, serpentine waste rock stripped in a chrysotile mining process, tailings discharged in a chrysotile mineral processing process and ultrabasic rock type metal mineral processing tailings, belongs to national hazardous solid waste treatment, carries out resource development on hazardous solid waste, and has multiple meanings of environmental protection, tailing warehouse safety regulation, new material industry development, social economy development and the like. Meanwhile, the calcareous raw materials and the argillaceous raw materials are both raw ores or tailings generated in the production process, belong to resource recycling of industrial solid wastes, are low in cost, solve series problems of tailing accumulation, tailing pond safety and the like, and accord with the national green environmental protection concept.

The invention also provides a magnesium silicate component cementing material clinker.

In an exemplary embodiment of the magnesium silicate component cement clinker of the present invention, the magnesium silicate component cement clinker is prepared by the above-mentioned method for preparing the magnesium silicate component cement clinker.

The magnesium silicate component cementing material clinker comprises 25-40% of MgO and 38-45% of SiO by mass percent₂、2％～25％CaO、2％～15％Fe₂O₃And 5 to 15 percent of Al₂O₃。

The magnesium silicate component cementing material clinker is a mixture phase powder material with a main crystal phase of olivine, quartz and active silicate. The powder particles (namely the magnesium silicate component cementing material clinker) are ground, added with water and stirred uniformly, and the formed body is cured and solidified into a stone body. The powder particles (namely, the clinker of the magnesium silicate component cementing material) are ground into powder, and the particle size of the powder after grinding is required to be 2-100 mu m. The range of water addition of the powder particles (namely the magnesium silicate component cementing material clinker) is 15-35 percent, and the powder particles have the gelling property after being uniformly mixed.

Compared with the conventional product, the magnesium silicate component cementing material clinker product has the following characteristics: the product does not contain any toxic or harmful substance, does not release toxic gases such as formaldehyde and the like, and is safe and environment-friendly; meanwhile, the components of the product are mainly inorganic substances, the water resistance and the alkali resistance are good, the application field is wide, the product is uniformly solidified in water, the coating is free from obstacles, and the product has better bonding strength than the conventional product.

In a further aspect, the invention provides the use of the clinker of magnesium silicate cement as described above as a raw material for the preparation of magnesium silicate cement.

In order that the above-described exemplary embodiments of the invention may be better understood, further description thereof with reference to specific examples is provided below.

Example 1

A method for preparing a magnesium silicate component cementing material clinker comprises the following steps:

s1, selecting a first ingredient as a serpentine beneficiation tailing raw material (namely the raw material containing a serpentine mineral), selecting a second ingredient as a siliceous limestone raw material (namely a calcareous raw material) containing impurities and a kaolin clay raw material (namely a clay raw material), and drying and crushing the serpentine beneficiation tailing raw material, the siliceous limestone raw material containing impurities and the kaolin clay raw material respectively to obtain a raw material powder mainly containing serpentine beneficiation tailing, a siliceous limestone raw material powder and a kaolin clay raw material powder with the particle size of-150 mu m.

The main chemical composition of the raw material powder of the serpentine beneficiation tailings is as follows by mass percent: 30% MgO and 35% SiO₂、10％CaO、10％Fe₂O₃、5％Al₂O₃And 10% of H₂O⁺. Here, H₂O⁺To bind water.

S2, mixing the ore dressing tailing raw material powder mainly containing serpentine, the siliceous limestone raw material powder containing impurities and the kaolin clay rock raw material powder obtained in the step S1 according to the mass ratio of 1: 0.35: 0.25, mixing uniformly, and then placing the mixture into a grinding mill for grinding to obtain a mixed material with the particle size of-90 mu m. Here, -90 μm means that the particle size of the mixed material is less than 90 μm.

S3, placing the mixed material obtained in the step S2 into a rotary kiln, heating and calcining at 950 ℃ for 30min, and obtaining the magnesium silicate component cementing material clinker.

The main chemistry of the clinker of the cementing material with the magnesium calcium silicate component is calculated by mass percentageComprises the following components: 32% MgO and 35% SiO₂、15％CaO、9％Fe₂O₃And 9% Al₂O₃. The clinker is a mixture phase powder material with the main crystal phase of olivine, quartz and active silicate.

Example 2

A method for preparing a magnesium silicate component cementing material clinker comprises the following steps:

s1, selecting the first ingredient as a tailing raw material (namely a raw material containing serpentine minerals) discharged in the chrysotile beneficiation process, selecting the second ingredient as a calcite marble raw material (namely a calcareous raw material), and drying and crushing the tailing raw material and the calcite marble raw material discharged in the chrysotile beneficiation process respectively to obtain tailing powder and clay limestone raw material powder and particles with the particle size of 10cm discharged in the chrysotile beneficiation process.

The main chemical composition of the tailing powder discharged in the chrysotile beneficiation process is as follows according to mass percentage: 31% MgO and 36% SiO₂、9％CaO、11％Fe₂O₃、4％Al₂O₃And 9% of H₂O⁺。

S2, mixing the tailing powder particles discharged in the chrysotile beneficiation process obtained in the step S1 and the calcite marble raw material powder particles according to the mass ratio of 1: 0.35, mixing, and placing in a pulverizer to grind after uniform mixing to obtain a mixed material with the particle size of-10 cm. Here, -10cm means that the particle size of the mixed material is less than 10 cm.

S3, placing the mixed material obtained in the step S2 into a pre-decomposition kiln, heating and calcining at 1150 ℃ for 120min to obtain the magnesium silicate component cementing material clinker.

The main chemical composition of the magnesium silicate calcium component cementing material clinker is as follows by mass percent: 35% MgO and 40% SiO₂、5％CaO、10％Fe₂O₃And 10% Al₂O₃. The clinker is a mixture phase powder material with the main crystal phase of olivine, quartz and active silicate.

Example 3

A method for preparing a magnesium silicate component cementing material clinker comprises the following steps:

s1, selecting the first ingredient as a super-basic rock type metal mineral separation tailing raw material (namely, a raw material containing a serpentine mineral), selecting the second ingredient as a montmorillonite clay raw material (namely, a clay raw material), and drying and crushing the super-basic rock type metal mineral separation tailing raw material and the montmorillonite clay raw material respectively to obtain granules mainly containing the serpentine mineral raw material and montmorillonite clay raw material granules with the grain diameter of-50 mu m.

The main chemical composition of the super-basic rock type metal mineral separation tailing powder particles is as follows by mass percent: 35% MgO and 40% SiO₂、5％CaO、10％Fe₂O₃、5％Al₂O₃And 5% of H₂O⁺。

S2, mixing the super-basic rock type metal mineral ore dressing tailing powder and montmorillonite clay rock raw material powder obtained in the step S1 according to the mass ratio of 1: 0.3, mixing, placing in a pulverizer to grind after even mixing, and obtaining the mixed material with the grain diameter of-50 mu m. Here, -50 μm means that the particle size of the mixed material is less than 50 μm.

S3, placing the mixed material obtained in the step S2 into a vertical kiln, heating and calcining at 1000 ℃ for 90min, and obtaining the magnesium silicate component cementing material clinker.

The main chemical composition of the magnesium silicate calcium component cementing material clinker is as follows by mass percent: 33% MgO and 35% SiO₂、24％CaO、5％Fe₂O₃And 3% Al₂O₃. The clinker is a mixture phase powder material with the main crystal phase of olivine, quartz and active silicate.

In summary, the beneficial effects of the invention include at least one of the following:

(1) the invention carries out phase detoxification treatment on dangerous solid waste containing serpentine minerals, and carries out roasting and phase inversion detoxification treatment on asbestos-containing waste, thereby realizing resource utilization of various asbestos-containing waste, and having important ecological and sustainable development significance on resource protection, saving and high-value utilization;

(2) the invention carries out waste treatment on dangerous solid waste containing serpentine minerals, and has important ecological and environmental significance on the safety of tailings reservoirs, environmental protection, utilization of waste resources and the like;

(3) the dangerous solid waste containing serpentine minerals is heated and calcined, so that the components, the structure, the appearance and the performance of the asbestos minerals are completely changed, the dangerous solid waste is prepared into the magnesium silicate component cementing material clinker, and the waste is changed into valuable;

(4) the magnesium silicate component cementing material clinker is used, so that the source and the range of the cementing material are expanded, the domestic infrastructure construction is promoted, the increasingly tense contradiction of building materials in the urbanization process is effectively relieved, the application of the magnesium cementing material is promoted, and the solid waste material recycling policy advocated and popularized by the nation is responded actively;

(5) according to the invention, the magnesium silicate component cementing material clinker is prepared by using the raw material with the serpentine mineral as the main component for the first time, so that the cement consumption can be reduced, the carbon emission and the environmental pollution can be reduced, the resource utilization of the serpentine mineral-containing solid waste can be realized, the environment can be protected, the land resource can be saved, a new thought can be provided for the non-toxic and harmless treatment of the hazardous waste, and the important ecological, environmental, economic and social benefits can be realized.

While the present invention has been described above in connection with exemplary embodiments, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.