CN108017297B

CN108017297B - Cement grinding method and cement grinding aid

Info

Publication number: CN108017297B
Application number: CN201610964504.4A
Authority: CN
Inventors: 钱文斌
Original assignee: Hunan Chang Di Environmental Technology Co Ltd
Current assignee: Hunan Chang Di Environmental Technology Co Ltd
Priority date: 2016-10-28
Filing date: 2016-10-28
Publication date: 2019-12-27
Anticipated expiration: 2036-10-28
Also published as: CN108017297A

Abstract

The invention provides a cement grinding method and a cement grinding aid, wherein the method comprises the following steps: grinding the cement to-be-ground material and the cement grinding aid together; wherein the cement grinding aid contains saponified waste lye of cyclohexanone prepared by oxidizing cyclohexane. The cement grinding method provided by the invention can be used for grinding cement by taking the saponified waste alkali liquor generated in the process of preparing cyclohexanone by oxidizing cyclohexane as a grinding aid.

Description

Cement grinding method and cement grinding aid

Technical Field

The invention relates to a cement grinding method and a cement grinding aid.

Background

The building material is an important basic raw material industry supporting the social and economic development, wherein cement and concrete are indispensable basic materials for building engineering and various structures, and the building material has wide application, large consumption, stable performance and durability. Taking cement production as an example, the existing cement production process is 'two-mill one-burning', namely, grinding, calcining and cement finish grinding of raw materials. The devices for grinding are roller presses, vertical mills and ball mills, the energy consumed by the grinding process in the cement production process is very high, and the utilization rate of the energy is very low, so that the energy consumption of cement production per year is very large. In the modern cement industry, the cement grinding aid has become one of the effective measures for improving the grinding output efficiency, reducing the grinding power consumption, improving the cement strength, improving the building material performance and reducing the production cost in the production of cement and the like. Grinding aid is added in the grinding process of cement, so that powder agglomeration can be prevented, ball wrapping is effectively weakened or prevented, and the grinding efficiency of cement is improved; can improve the quality of cement and the grade of products.

Cyclohexanone is a basic raw material for producing nylon, and a large amount of waste water is produced in the production process, and is called 'saponification waste lye' in the industry. The total amount of the wastewater in the country is about 80 ten thousand tons/year (by 50 percent concentration), the COD is high, and the biochemical treatment cannot be directly carried out. The currently widely adopted incineration method has the disadvantages of large investment, large energy consumption, certain environmental influence and resource waste. Therefore, the treatment of the saponified waste lye is a great problem in the current nylon raw material industry.

Disclosure of Invention

The invention aims to provide a cement grinding method and a cement grinding aid.

In order to achieve the above object, the present invention provides a method for cement grinding, comprising: grinding the cement to-be-ground material and the cement grinding aid together; wherein the cement grinding aid contains saponified waste lye of cyclohexanone prepared by oxidizing cyclohexane.

Preferably, the saponified waste lye of cyclohexane oxidation cyclohexanone contains 30-90 wt.% of water, based on the weight of the saponified waste lye of cyclohexane oxidation cyclohexanone.

Preferably, the saponified waste lye of cyclohexane oxidation cyclohexanone contains 0.3-5 wt.% of sodium hydroxide, based on the weight of said saponified waste lye of cyclohexane oxidation cyclohexanone.

Preferably, the process for preparing cyclohexanone by oxidizing cyclohexane is at least one selected from a cobalt salt catalytic oxidation method, a boric acid catalytic oxidation method, a titanium silicalite molecular sieve catalytic oxidation method and a catalyst-free oxidation method.

Preferably, the grinding aid also contains a pH value regulator, and the addition amount of the pH value regulator is based on the regulation of the pH value of the grinding aid to 7-14.

Preferably, the pH adjustor is at least one selected from the group consisting of hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, carbonic acid, formic acid, acetic acid, oxalic acid, propionic acid, malonic acid, butyric acid, succinic acid, valeric acid, glutaric acid, caproic acid, adipic acid, hydroxycaproic acid, polycarboxylic acid, and sulfonic acid.

Preferably, the grinding aid also contains waste liquid from the preparation of caprolactam from cyclohexanone, and the waste liquid from the preparation of caprolactam from cyclohexanone contains waste liquid from the preparation of cyclohexanone oxime by oximation of cyclohexanone and/or waste liquid from the preparation of caprolactam by rearrangement of cyclohexanone oxime; wherein the weight ratio of the saponified waste lye to the waste liquid from the preparation of caprolactam from cyclohexanone is 100: (0-1000).

Preferably, the waste liquid from the production of caprolactam from cyclohexanone contains 0.1-15 wt% of caprolactam, preferably 1-15 wt% of caprolactam.

Preferably, the grinding aid further comprises a cement enhancing agent comprising at least one member selected from the group consisting of an alcamines additive, a sodium and/or calcium salt additive, a cyanamide additive, and a polyol ether additive.

Preferably, the alkanolamine additive accounts for 10-90 wt% of the grinding aid by weight, and is at least one selected from the group consisting of triethanolamine, triisopropanolamine, tricyclohexanolamine, diethanol monoisopropanolamine, diethanol monocyclohexanolamine, diisopropanol monoethanolamine, diisopropanol monocyclohexanolamine, dicyclohexylalcohol monoethanolamine and dicyclohexylalcohol monoisopropanolamine.

Preferably, the sodium salt and/or calcium salt additive accounts for 1-90 wt% of the grinding aid by weight, and the sodium salt and/or calcium salt additive is at least one selected from sodium thiocyanate, sodium phosphate, sodium chloride, calcium sulfate, calcium chloride, sodium fluorosilicate, sodium sulfate and sodium nitrate.

Preferably, the polyol ether additive comprises at least one selected from the group consisting of polyols, polyol ethers and sugars, the polyols comprise at least one selected from the group consisting of ethylene glycol, propylene glycol, glycerol, polyethylene glycol, triglycerol and polypropylene glycol, the polyol ethers comprise polyethylene glycol ethers and/or polypropylene glycol ethers, and the sugars comprise at least one selected from the group consisting of white sugar, glucose and molasses, in a proportion of 1 to 90% by weight, preferably 1 to 50% by weight, of the grinding aid.

Preferably, the cyanamide additive accounts for 10-90 wt% of the grinding aid, and the cyanamide additive comprises at least one selected from melamine, sulfonated melamine, cyanamide and tricyanamide.

Preferably, the grinding aid further comprises a defoamer; the defoaming agent accounts for 0.01-0.5 wt% of the grinding aid by weight, and comprises an organic silicon defoaming agent and/or a polyether modified silicon additive.

Preferably, the grinding aid further comprises a cement accelerator which is at least one selected from the group consisting of aluminum salts, magnesium salts, carbonates, and silica salts.

Preferably, the cement grinding aid accounts for 0.01 to 0.3 weight percent of the total weight of the cement grinding aid and the material to be ground.

Preferably, the cement abrasive comprises cement clinker, including or not including building materials; the cement clinker is a calcined product of a calcareous raw material, and the calcareous raw material is at least one selected from limestone, marl, chalk, shells and coral; the building material is at least one selected from fly ash, slag, furnace slag, volcanic ash, sandstone, quartz sand, clay, shale, gypsum, iron ore powder, kaolin and bauxite.

The invention also provides a cement grinding aid which contains the saponified waste alkali liquid obtained by oxidizing cyclohexane to prepare cyclohexanone.

The method of the invention uses the saponification waste lye of cyclohexanone prepared by cyclohexane oxidation as a cement grinding aid to carry out cement grinding, which not only can solve the problem of reasonable treatment of the saponification waste lye of cyclohexanone prepared by cyclohexane oxidation, achieve the purposes of cleanness, environmental protection, low cost and comprehensive utilization of resources, but also has good grinding-aid effect, improves the material fluidity in the grinding process, reduces the 45 micron screen residue and improves the specific surface area of the product obtained by grinding without influencing the final construction performance and mechanical performance of cement.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Detailed Description

The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

The invention provides a cement grinding method, which comprises the following steps: grinding the cement to-be-ground material and the cement grinding aid together; wherein the cement grinding aid contains saponified waste lye of cyclohexanone prepared by oxidizing cyclohexane.

According to the invention, the process for preparing cyclohexanone by oxidizing cyclohexane has more research and faster development since the industrialization in 1961. According to different catalysts, including cobalt salt catalytic oxidation, boric acid catalytic oxidation, titanium silicalite catalytic oxidation and catalyst-free oxidation, although the technological processes have various characteristics, the basic principle and the reaction flow are the same, and the specific reaction flow can be shown as the following formula:

in the first step, cyclohexane is oxidized with an oxidizing agent (e.g., oxygen) in the presence or absence of a catalyst to form cyclohexyl hydroperoxide. For example, the reaction temperature is 160 ℃, the pressure is about 1.08MPa, 5 kettles are connected in series for reaction for 1h, the conversion rate of cyclohexane is controlled to be about 5 weight percent by contacting with air, and the selectivity of cyclohexyl hydroperoxide is about 95 weight percent.

In the second step, alkali, such as sodium hydroxide solution, is added into the product obtained in the first step, the function of the alkali is to decompose peroxide, and cobalt naphthenate with the weight of 0-10ppm relative to the weight of the reaction liquid can be added to catalyze and promote the decomposition of cyclohexyl hydroperoxide according to the process condition, so that cyclohexanone is obtainedAnd cyclohexanolMainly organic phase and aqueous phase saponification waste lye. The saponified waste lye is generally a black liquid or a liquid containing a portion of solids, and has a relative density of generally 1.05 to 1.25 g/ml, and may contain 30 to 90% by weight of water, 0.3 to 5% by weight of sodium hydroxide, salts, organic substances, and the like, based on the weight of the saponified waste lye.

According to the invention, the saponified waste lye of cyclohexanone prepared by oxidizing cyclohexane can be directly used as a grinding aid for grinding without any pretreatment, and the effect of adding the adjusting additive is better. The adjusting additive refers to a component which is added into the grinding aid and is helpful for improving grinding and enhancing effects, and the composition and the addition amount of the adjusting additive are not limited in the invention, and the adjusting additive can be added as a single component or a conventional grinding aid in the form of an additive. For example, the conditioning additive may include at least one selected from a pH adjuster, a cement enhancer, a defoamer, and a cement accelerator, and may further include at least one of urea, a lignin salt, and calcium formate, and other addable components known to those skilled in the art. The weight ratio of the saponification waste lye of the cyclohexanone prepared by cyclohexane oxidation and the adjusting additive can be 100: (0-1000), preferably 100: (1-400).

According to the invention, because the saponified waste alkali liquor contains excessive alkali, in order to avoid adverse effects on the construction strength of building materials such as cement and the like and improve the grinding effect, a pH value regulator can be added into the saponified waste alkali liquor to regulate the pH value of the grinding aid, the addition amount of the pH value regulator is not particularly limited, and the pH value of the grinding aid can be regulated to 7-14. The composition of the pH adjustor is also not particularly limited in the present invention, and may be, for example, at least one selected from the group consisting of hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, carbonic acid, formic acid, acetic acid, oxalic acid, propionic acid, malonic acid, butyric acid, succinic acid, valeric acid, glutaric acid, caproic acid, adipic acid, hydroxycaproic acid, polycarboxylic acid, and sulfonic acid.

According to the invention, the process for preparing caprolactam by oximation and rearrangement reaction of cyclohexanone comprises a plurality of product refining steps such as extraction, back extraction, ion exchange, rectification and the like besides the two main reactions due to the byproduct of inorganic salts such as ammonium phosphate, ammonium sulfate, sodium nitrate and the like, and the steps can generate respective waste liquid when the product is refined, such as caprolactam and ammonium sulfate refined by an extraction method, the extraction waste liquid can carry waste liquid containing chemical components of caprolactam and ammonium sulfate, the waste liquid is collectively called the waste liquid of caprolactam prepared from cyclohexanone, the national total amount of the waste liquid is about 50 ten thousand tons/year (by 50 weight percent concentration), COD is high, and biochemical treatment cannot be directly carried out. The currently widely adopted incineration method has the disadvantages of large investment, large energy consumption, certain environmental influence and resource waste.

According to the invention, the waste liquid from the production of caprolactam from cyclohexanone can contain the waste liquid from the production of cyclohexanone oxime from the oximation of cyclohexanone and/or the waste liquid from the production of caprolactam from rearrangement of cyclohexanone oxime, preferably, the weight ratio of the waste liquid from the production of cyclohexanone oxime from the oximation of cyclohexanone to the waste liquid from the production of caprolactam from rearrangement of cyclohexanone oxime in the waste liquid from the production of caprolactam from cyclohexanone is (0-30): (70-100).

According to the present invention, cyclohexanone may be oximated with hydroxylamine or the like to produce cyclohexanone oxime, and the process may include at least one selected from the group consisting of raschig method (HSO method), nitric oxide method (NO method), hydroxylamine phosphate method (HPO method), and ammoximation method (HAO method), and for example, the specific process steps of ammoximation method may be represented by the following formula:

in the process of preparing cyclohexanone oxime by oximating cyclohexanone, acid-base salt wastewater is generated by a water phase and a cleaning filter, the wastewater is called waste liquid for preparing cyclohexanone oxime by oximating cyclohexanone, and the main components of the waste liquid are water and ammonium salts such as ammonium phosphate, sodium nitrate, sodium phosphate and the like.

According to the present invention, cyclohexanone oxime may be subjected to intramolecular rearrangement in the presence of sulfuric acid or oleum or a catalyst (e.g., a titanium silicalite molecular sieve) to obtain caprolactam, which is referred to as beckmann transposition rearrangement reaction. When fuming sulfuric acid is used, the fuming sulfuric acid is generally neutralized with ammonia water after rearrangement, and a large amount of ammonium sulfate is produced as a by-product. In order to improve the yield of caprolactam and ensure the quality, ammonium sulfate solution is extracted subsequently, and the caprolactam crude product generated by rearrangement is extracted and back-extracted, wherein solvents such as benzene and toluene are generally adopted for extraction. In addition, after extraction, the caprolactam is subjected to anion-cation exchange process to remove residual inorganic salts such as ammonium sulfate and the like. The waste liquid after extraction, the waste liquid after back extraction and the waste liquid after ion exchange, which are generated in the product refining steps, are called the waste liquid for preparing caprolactam through cyclohexanone-oxime rearrangement, and are called the waste liquid for oxime rearrangement for short. The waste liquid from caprolactam rearrangement production comprises main organic components such as caprolactam, o-cyclohexanediol, o-hydroxycyclohexanone, hexanal and the like, and main inorganic components such as sodium nitrate, ammonium sulfate, sodium thiocyanate and the like. The specific reaction process steps can be shown as follows:

according to the invention, the waste liquid from the production of caprolactam from cyclohexanone preferably contains 0.1-15 wt.% of caprolactam, 30-80 wt.% of water and 2-60 wt.% of inorganic salts, more preferably contains 1-15 wt.% of caprolactam, 30-80 wt.% of water and 5-60 wt.% of inorganic salts. The caprolactam contributes to the strength of the cement product, and the inorganic salt may include at least one selected from the group consisting of sodium nitrate, sodium sulfate, sodium thiocyanate, sodium chloride, sodium carbonate, ammonium nitrate, and ammonium sulfate. The weight ratio of the saponification waste lye to the waste liquid of the caprolactam preparation from cyclohexanone can be 100: (0-1000), preferably 100: (1-400).

According to the present invention, the cement reinforcing agent may include at least one selected from the group consisting of an alcamines additive, a sodium and/or calcium salt additive, a cyanamide additive, and a polyol ether additive.

According to the invention, the alcohol amine additive is helpful for eliminating static electricity, improving grinding effect and improving product strength, the proportion of the alcohol amine additive in the grinding aid can be 10-90 wt%, and the alcohol amine additive can be at least one selected from triethanolamine, triisopropanolamine, tricyclohexylamine, diethanol monoisopropanolamine, diethanol monocyclohexanolamine, diisopropanol monoethanolamine, diisopropanol monocyclohexanolamine, dicyclohexylethanolamine and dicyclohexylalcohol monoisopropanolamine.

According to the present invention, the sodium salt and/or calcium salt additive can improve the grindability and fluidity of the cement to be ground and enhance the strength of the cement product. The grinding aid comprises a grinding aid, a sodium salt and/or calcium salt additive and a grinding aid, wherein the sodium salt and/or calcium salt additive accounts for 1-90 wt% of the grinding aid by weight, and the sodium salt and/or calcium salt additive can be at least one selected from sodium thiocyanate, sodium phosphate, sodium chloride, calcium sulfate, calcium chloride, sodium fluosilicate, sodium sulfate and sodium nitrate.

According to the invention, the polyol ether additive is helpful for eliminating static electricity, improving the grinding effect and improving the strength of cement products. The proportion of the grinding aid additive by weight may be 1-90 wt%, preferably 1-50 wt%, based on the grinding aid, and the polyol ether additive may include at least one selected from the group consisting of polyols, polyol ethers, and sugars, the polyols may include at least one selected from the group consisting of ethylene glycol, propylene glycol, glycerol, polyethylene glycol, triglycerol, and polypropylene glycol, the polyol ethers may include polyethylene glycol ethers and/or polypropylene glycol ethers, and the sugars may include at least one selected from the group consisting of white sugar, glucose, and molasses.

According to the invention, the cyanamide additive is helpful for eliminating static electricity, improving grinding effect and improving the strength of cement products, the proportion of the cyanamide additive in the grinding aid can be 10-90 wt%, and the cyanamide additive can comprise at least one selected from melamine, sulfonated melamine, cyanamide and tricyanamide.

According to the invention, the defoaming agent can be used for reducing the surface tension of the grinding aid, inhibiting the generation of foam or eliminating the generated foam, thereby improving the grinding aid effect. The defoaming agent accounts for 0.01-0.5 wt% of the grinding aid, the defoaming agent can comprise a silicone defoaming agent and/or a polyether modified silicone additive, the silicone defoaming agent can be at least one selected from polydimethylsiloxane, fluorosilicone and ethylene glycol siloxane, and can also be a special defoaming agent for commercially available concrete, such as building material industry defoaming agents of Dongguan Defeng defoaming agent company Limited, and product models of 'DF-179' and 'DF-175'.

According to the invention, the grinding aid may also contain a cement accelerator, which may be at least one selected from the group consisting of aluminum salts, magnesium salts, carbonates, and silica salts.

According to the invention, the grinding aid can be used for grinding cement to-be-ground materials in an internal mixing amount of 0.01-0.3 wt% so as to improve the grinding efficiency and the performance of the obtained ground product.

The cement abrasive material is generally cement clinker, which is a calcined product of a calcareous raw material containing calcium carbonate as a main component and is used for preparing cement powder after grinding, and the cement powder is a product obtained by mixing clinker with other mixed materials and grinding, namely, components forming the cement, for example, the method of the invention can be used for preparing various grades of cement, such as final cement powder for preparing PO42.5, PI 42.5 or PC32.5R cement. The calcareous material may be a material selected from limestone, marl, chalk, shells and corals. Wherein, the main mineral of the limestone is calcite, the pure limestone contains CaO about 56 percent and the loss on ignition is about 44 percent; the marlite is uniformly mixed sedimentary rock formed by simultaneously depositing calcium carbonate and clay, the main mineral of the marlite is calcite, the CaO content of high-calcium marlite is more than or equal to 45 weight percent, and the CaO content of low-calcium marlite is less than 45 weight percent; the chalk is a substance formed by stacking marine organism shells and shells, and the main component of the chalk is calcium carbonate with the content of 80-90 percent; the calcium carbonate content of the shell and coral raw materials is about 90 percent.

In the grinding of cement, artificial or natural mineral materials, called cement admixtures, which may include one or more of fly ash, slag, volcanic ash, sandstone, quartz sand, clay, shale, gypsum, iron ore powder, kaolin, and bauxite, are blended in order to improve the properties of cement, adjust the strength grade of cement, increase the yield of cement, and the like.

China is a country with large consumption of building materials, cement is taken as an example, the total yield of the cement reaches 18 hundred million tons in 2011, and about 90 million tons of grinding aids are needed according to the fact that the dosage of the grinding aids accounts for 0.05 weight percent of the cement product.

According to the invention, grinding operation by adding grinding aid can be carried out by conventional technical means in the field, such as grinding for 20-40min by using a ball mill, a roller press or a vertical mill.

The invention will be further illustrated by the following examples, but is not to be construed as being limited thereto.

In the embodiment of the invention, saponified waste alkali liquor is taken from saponified waste alkali liquor generated in a cyclohexane oxidation device of caprolactam division of the department of the country petrochemical group, holy division, on 2016 (6 months and 3 days), and a process for preparing cyclohexanone by cyclohexane oxidation is a catalyst-free oxidation method, marked as solution A, and has the following properties: the relative density was 1.197 g/cc, the water content was 42 wt% and the sodium hydroxide content was 2 wt%.

In the embodiment of the invention, the waste liquid obtained by preparing caprolactam from cyclohexanone is marked as liquid C, which is obtained from a corresponding production device of caprolactam division of Barring division of petrochemical group in China, and comprises 10 wt% of waste liquid obtained by oximation of cyclohexanone to prepare cyclohexanone oxime and 90 wt% of waste liquid obtained by rearrangement of cyclohexanone oxime to prepare caprolactam. The specific properties of the liquid C are as follows: the relative density is 1.16 g/cubic centimeter, the content of ammonium nitrate is 14 weight percent, the content of ammonium sulfate is 10 weight percent, the content of sodium thiocyanate is 11 weight percent, the content of caprolactam is 6 weight percent, the content of water is 55 weight percent, and the balance is impurities such as sodium fatty acid, paraffin oil, organosilicon and the like.

The conditioning additives used in the examples were: sulfuric acid, acetic acid, adipic acid, triethanolamine, and triglycerol, all commercially available.

The embodiment and the comparative example of the invention adopt a method in national standard GB/T26748-2011 cement grinding aid of the people's republic of China to carry out detection.

The grinding in the embodiment and the comparative example of the invention is carried out in a national standard cement test small mill which accords with the grinding-aid effect experimental method in GB/T26748-.

The comparative example DA1 and examples SA1-SA5 illustrate the effect of using only liquid A as a cement grinding aid on the grinding efficiency of cement clinker.

Comparative example DA1

The cement clinker (PO 42.5 cement) is ground, and the specific conditions and results are shown in Table 1.

Example SA1-SA5

The liquid A is mixed with cement clinker (PO 42.5 cement) in different weight proportions to be ground, and the concrete conditions and results are shown in Table 1.

Table 1: milling conditions and results for comparative example DA1 and examples SA1-SA5

As can be seen from the results in table 1: 1. after the saponified waste alkali liquor is added, the fluidity of all materials is improved; 2. after the saponified waste lye is added, the 45 micron screen residue of all the materials is reduced; 3. after the saponified waste lye is added, the specific surface areas of the materials in the examples SA1-SA5 are all increased, but excessive addition can greatly improve the fluidity of the materials, reduce the friction force between the materials and grinding media, prevent the materials from being effectively ground, and reduce the specific surface area while increasing the residue. These results show that the saponified waste lye has good grinding-aiding effect on cement clinker.

Examples SB1-SB4 illustrate the effect of using liquor A (100 parts by weight) with and without the addition of conditioning additives as a cement grinding aid on the grinding efficiency of cement clinker which was used in examples SB1-SB4 under the trade designation PO 42.5.

Example SB1

And (3) taking the liquid A as a grinding aid, and mixing cement clinker in a proportion of 0.05 weight percent for grinding treatment, wherein specific conditions and results are shown in a table 2.

Example SB2

Adding sulfuric acid into the solution A to adjust the pH value to 10, then using the solution A as a grinding aid, and mixing cement clinker in a proportion of 0.05 weight percent for grinding treatment, wherein specific conditions and results are shown in Table 2.

Example SB3

And adding acetic acid into the solution A to adjust the pH value to 10, adding 40 parts by weight of triethanolamine and 30 parts by weight of solution C to serve as a grinding aid, and adding cement clinker in a proportion of 0.05 wt% for grinding treatment, wherein specific conditions and results are shown in Table 2.

Example SB4

Adding adipic acid into the solution A to enable the pH value to be 10, adding 30 parts by weight of triethanolamine, 25 parts by weight of solution C and 15 parts by weight of triglycerin, then using the mixture as a grinding aid, and adding cement clinker in a proportion of 0.05 wt% for grinding treatment, wherein specific conditions and results are shown in Table 2.

Table 2: grinding conditions and results of examples SB1-SB4

As can be seen from the results in table 2: after the adjustment additive is added into the solution A for optimization, the 45-micron screen residue of all the materials is reduced and the specific surface area is increased, which shows that the adjustment additive has an optimization effect on the saponified waste lye.

Comparative example DC1

Comparative example DC1 construction performance of a cement product with the trade name PO42.5 is determined by adopting the test method standard for the performance of ordinary concrete mixture GB/T50080-2002 of the national standards of the people's republic of China, and specific test conditions and results are shown in Table 3.

Examples SC1-SC4

Examples SC1-SC4 illustrate the influence of the liquid A and the liquid A containing the adjusting additive on the cement construction performance, the grinding aid in examples SB1-SB4 is added into the cement product in a proportion of 0.05 weight percent, the brand number of the used cement product is PO42.5, the specific test method is shown in the national standard GB/T50080 and 2002 standard for the performance test method of the common concrete mixture of the people's republic of China, and the specific test conditions and results are shown in Table 3.

Table 3: comparative example DC1 and examples SC1-SC4 illustrate the effect of saponified waste lye on the workability of Cement

As can be seen from the results in Table 3, the addition of the saponified waste lye increases the water consumption for the standard consistency of cement, shortens the setting time, and has little or no influence on the mobile phase of the mortar, which both meet the national standards.

Comparative examples DD1-DD3

The cement mechanical properties of the comparative examples DD1-DD3 with the trade marks of PI 52.5, PO42.5 and PC32.5R are measured, the specific test method is shown in the national standard GB/T50081-2002 standard for testing the mechanical properties of the common concrete of the people's republic of China, and the specific test conditions and results are shown in Table 4.

Examples SD1-SD3

Examples SD1-SD3 illustrate the influence of waste saponified lye on the mechanical properties of cement, wherein the grinding aid of example SB4 is added into cement in an amount of 0.05 wt%, the brands of the used cement are PI 52.5, PO42.5 and PC32.5R, the specific test method is in the national Standard of the people's republic of China GB/T50081-2002 Standard test method for the mechanical properties of ordinary concrete, and the specific test conditions and results are shown in Table 4.

Table 4: comparative examples DD1-DD3 and examples SD1-SD3 illustrate the influence of saponified waste lye on the workability of the cements

As can be seen from the results in Table 4, the cement strength changes after the grinding aid is added are different due to different cements, so that the compressive strength of cement mortar at all ages is increased and the compressive strength meets the requirements of national standard regulations.

Although the invention has been described in detail hereinabove by way of general description, specific embodiments and tests, it will be apparent to those skilled in the art that modifications and improvements can be made thereto or known or even established grinding aid ingredients, such as polycarboxylates, lignosulfonates, polyacrylamides, can be added based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A method of cement grinding, the method comprising: grinding the cement to-be-ground material and the cement grinding aid together; wherein the cement grinding aid contains saponified waste lye of cyclohexanone prepared by oxidizing cyclohexane; the saponification waste lye of the cyclohexanone prepared by cyclohexane oxidation contains 30 to 90 weight percent of water and 0.3 to 5 weight percent of sodium hydroxide by weight and taking the weight of the saponification waste lye of the cyclohexanone prepared by cyclohexane oxidation as a reference;

the cement abrasive to be ground comprises cement clinker, including or not including cement admixture; the cement clinker is a calcined product of a calcareous raw material, and the calcareous raw material is at least one selected from limestone, marl, chalk, shells and coral; the cement admixture is at least one selected from the group consisting of fly ash, slag, volcanic ash, sandstone, quartz sand, clay, shale, gypsum, iron ore powder, kaolin and bauxite.

2. The method of claim 1, wherein the process for preparing cyclohexanone by oxidizing cyclohexane is at least one selected from a cobalt salt catalytic oxidation process, a boric acid catalytic oxidation process, a titanium silicalite catalytic oxidation process, and a catalyst-free oxidation process.

3. The method of claim 1, wherein the grinding aid further comprises a pH adjusting agent added in an amount to adjust the pH of the grinding aid to a range of 7 to 14.

4. The method according to claim 3, wherein the pH adjustor is at least one selected from the group consisting of hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, carbonic acid, formic acid, acetic acid, oxalic acid, propionic acid, malonic acid, butyric acid, succinic acid, valeric acid, glutaric acid, caproic acid, adipic acid, hydroxycaproic acid, polycarboxylic acid, and sulfonic acid.

5. The method of claim 1 wherein the grinding aid further comprises a cement enhancing agent comprising at least one selected from the group consisting of an alcamines additive, a sodium and/or calcium salt additive, a cyanamide additive, and a polyol ether additive.

6. The method of claim 5 wherein the proportion of the alkanolamine additive is 10-90% by weight of the grinding aid, the alkanolamine additive being at least one selected from the group consisting of triethanolamine, triisopropanolamine, tricyclohexylamine, diethanolisopropanolamine, diethanolisocyclolamine, diisopropanolamine, dicyclohexylamine, and dicyclohexylamine monoisopropanolamine.

7. The method of claim 5 wherein the grinding aid is present in a ratio of 1-90% by weight of sodium and/or calcium salt additive, the sodium and/or calcium salt additive being at least one selected from the group consisting of sodium thiocyanate, sodium phosphate, sodium chloride, calcium sulfate, calcium chloride, sodium fluorosilicate, sodium sulfate and sodium nitrate.

8. The method of claim 5 wherein the proportion of grinding aid additive is 1-90% by weight, the polyol ether additive comprising at least one member selected from the group consisting of polyols, polyol ethers, and sugars, the polyols comprising at least one member selected from the group consisting of ethylene glycol, propylene glycol, glycerol, polyethylene glycol, triglycerol, and polypropylene glycol, the polyol ethers comprising polyethylene glycol ethers and/or polypropylene glycol ethers, the sugars comprising at least one member selected from the group consisting of white sugar, glucose, and molasses.

9. The method of claim 5 wherein the cyanamide additive comprises at least one member selected from the group consisting of melamine, sulfonated melamine, mono-cyanamide, and tri-cyanamide in a weight ratio of 10-90% by weight of the grinding aid.

10. The method of claim 1 wherein the grinding aid further comprises an antifoaming agent; the defoaming agent accounts for 0.01-0.5 wt% of the grinding aid by weight, and comprises an organic silicon defoaming agent and/or a polyether modified silicon additive.

11. The method of claim 1 wherein the grinding aid further comprises a cement accelerator which is at least one selected from the group consisting of aluminum salts, magnesium salts, carbonates, and silica salts.

12. The method of claim 1, wherein the cement grinding aid comprises 0.01 to 0.3 weight percent of the total weight of the cement abrasive to be ground and the cement grinding aid, based on weight.