Preparation method of solid cement grinding aid

Abstract

The invention discloses a preparation method of a solid cement grinding aid, and belongs to the technical field of cement admixtures. The dust waste residue limestone powder in the raw materials contains CaO and SiO2, the waste residue aluminum-magnesium silicate contains MgAl2SiO6, an interlayer on the surfaces of the three raw materials is combined with hydrochloric acid, the chemical modification and activation effects can be achieved, and the formed solid grinding aid has good grinding-aiding, yield-increasing and enhancing effects in cement production; organic molecules of the activated solid grinding aid are coated on the surfaces of cement clinker, volcanic ash and gypsum particles and can be in direct contact with molecular films among the cement clinker, volcanic ash and gypsum particles, so that the decomposition effect of the solid grinding aid on C3S and C3A in cement in the cement grinding and hydration process is achieved; the solid grinding aid relatively adsorbed on the surfaces of C3S and C3A can further accelerate the hydration reaction, so that the yield, strength, compatibility, setting time, water demand and the like of the cement are effectively improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cement admixtures, and particularly relates to a preparation method of a solid cement grinding aid. BACKGROUND

[0002] In the field of cement production, the application of grinding aids has been extremely wide, which plays a key role in improving the grinding efficiency of cement and improving the performance of cement. However, the current preparation of grinding aids often takes triethanolamine as the main raw material, which brings many problems. In recent years, the market price of triethanolamine continues to rise, which directly leads to a substantial increase in the cost of liquid grinding aids, and further makes the manufacturing cost of cement products of cement plants continue to rise, which brings great economic pressure to enterprises. In addition, the liquid grinding aid itself has obvious defects, and its water content is relatively large, which often leads to poor effect in actual application. When it is added to cement, the quality improvement effect is not obvious, and sometimes it even interferes with the normal operation of the mill, reduces the output of the mill, and affects the stability of the quality of cement. Therefore, the cement industry urgently needs to find a non-triethanolamine grinding aid substitute to effectively reduce the manufacturing cost of grinding aids and cement, while ensuring the efficiency of the cement production process and the stability of the product quality, and promoting the sustainable development of the cement industry. SUMMARY

[0003] To solve the above technical problems, the application provides a preparation method of a solid cement grinding aid.

[0004] To achieve the above-mentioned purpose, the application provides the following technical scheme:

[0005] The application provides a solid cement grinding aid, which comprises the following raw materials in percentage by weight: dust waste residue limestone powder 85-90%, waste residue magnesium aluminum silicate 5-12%, and hydrochloric acid 3-5%.

[0006] Technical principle: the dust waste residue limestone powder in the raw material of the application contains CaO and SiO2, the waste residue magnesium aluminum silicate contains MgAl2SiO6, and the surface barrier of the three combined with hydrochloric acid can play a role of chemical modification and activation. The formed solid grinding aid plays a good grinding and production increasing and strengthening role in cement production, so that the activated solid grinding aid organic molecules are wrapped on the surface of cement clinker, pozzolan and gypsum particles, can directly contact the molecular film between the cement clinker, pozzolan and gypsum particles, and achieve the decomposition effect of the solid grinding aid on C3S and C3A in the cement in the cement grinding and hydration process. The solid grinding aid adsorbed on the surface of C3S and C3A will further accelerate the hydration reaction, so that the yield, strength, compatibility, setting time and water requirement of cement are effectively improved.

[0007] Further, the mass content of CaO in the dust waste residue limestone powder is 18.61%, and the mass content of SiO2 is 16.52%.

[0008] Further, the mass content of MgAl2SiO6 in the waste residue magnesium aluminum silicate is 76.31%.

[0009] Further, the mass content of HCl in the hydrochloric acid is 36.5%.

[0010] Further, the mass content of HCl in the new mineral composition formed by the solid cement grinding aid is 1.1-1.83%, and the mass content of activated free water is 1-3%.

[0011] Further, the solid cement grinding aid comprises the following raw materials in percentage by weight: dust waste residue limestone powder 86-90%, waste residue magnesium aluminum silicate 5-10%, and hydrochloric acid 4-5%.

[0012] The application provides a preparation method of the solid cement grinding aid as described in the above technical solution, comprising the following steps: mixing dust waste residue limestone powder, waste residue magnesium aluminum silicate, and hydrochloric acid, stirring, and stacking and activating to obtain the solid cement grinding aid.

[0013] Further, the stirring speed is 125 r / min, and the stirring time is 3 min; and / or,

[0014] The stacking and activating temperature is room temperature, and the stacking and activating time is 24 h.

[0015] The application also provides an application of the solid cement grinding aid as described in the above technical solution in cement production.

[0016] Further, the incorporation amount of the solid cement grinding aid is 1-5% of the mass of cement.

[0017] Compared with the prior art, the application has the following advantages and technical effects:

[0018] The application forms a new solid cement grinding aid composed of minerals by using hydrochloric acid, dust waste residue limestone powder, and waste residue magnesium aluminum silicate to mix and activate neutralization chemical reaction, thereby providing a path for the effective use of dust waste residue limestone powder discharged every year, providing a new product for the grinding aid industry, providing an excellent grinding aid product for the cement industry to increase production, save energy, improve product quality and economic benefits, saving production costs for grinding aid enterprises and cement enterprises, and improving yield and quality.

[0019] The main raw material of the solid cement grinding aid is dust waste residue limestone powder and waste residue magnesium aluminum silicate, waste is turned into treasure, compared with liquid cement grinding aids made of 100% natural materials and other expensive products on the market, the manufacturing cost is significantly reduced, can be widely used in cement products, realizes energy saving and emission reduction, reduces the emission of harmful gases such as CO2 and CS2, and protects the ecological environment.

[0020] The solid cement grinding aid product points out the direction for efficient resource utilization and upgrading of the grinding aid industry, and helps the development of the grinding aid industry, can replace the traditional liquid grinding aid by 100% in cement products, has the advantages and characteristics of high grinding efficiency, high cement hydration strength, low water demand, normal or slightly fast setting time, low dry shrinkage, qualified stability, large cement mortar fluidity and the like.

[0021] The quality technical index of the solid cement grinding aid provided by the application is that the grinding effect is 45um sieve residue of 6.5-10.0, the water requirement of standard consistency is 0.1-0.18%, the initial setting time is 10-16min, the final setting time is 12-17min, and the boiling safety is qualified; the cement mortar fluidity is 103-115%, the mortar dry shrinkage is 0.011-0.015% for 28 days, the chloride ion content is 0.01%, the pH value is 8.6-8.7, and the odor is qualified; the cement mortar compressive strength is 108-117% for 3 days and 109-117% for 28 days. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the application, not all. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the application.

[0023] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the application will be further described in detail below with specific embodiments.

[0024] The embodiment of the application provides a solid cement grinding aid, which comprises the following raw materials in percentage by weight: dust waste residue limestone powder 85-90%, waste residue magnesium aluminum silicate 5-12% and hydrochloric acid 3-5%; further preferably: dust waste residue limestone powder 86-90%, waste residue magnesium aluminum silicate 5-10% and hydrochloric acid 4-5%.

[0025] In the preferred embodiment, the mass content of CaO in the dust waste residue limestone powder is 18.61%, and the mass content of SiO2 is 16.52%. The dust waste residue limestone powder in the application is derived from the waste residue discharged in the dust collection during the mining process of the mine resource limestone mechanism sand, which is used for the preparation of the solid cement grinding aid, realizes the comprehensive utilization and environmental protection disposal of the waste residue, can not only reduce the waste residue stacking pressure and environmental risk, but also realizes the recycling of resources, and significantly reduces the manufacturing cost.

[0026] In the preferred embodiment, the mass content of MgAl2SiO6 in the waste residue magnesium aluminum silicate is 76.31%. The waste residue magnesium aluminum silicate in the application is derived from the waste residue discharged during the production of magnesium aluminum silicate products, which is used for the preparation of the solid cement grinding aid to realize the waste utilization, reduce the emission of harmful gases such as CO2 and CS2, and protect the ecological environment.

[0027] In the preferred embodiment, the mass content of HCl in the hydrochloric acid is 36.5%. The application improves the phenomenon of cracking of cement products caused by high alkali content in cement by using hydrochloric acid with a mass content of HCl of 36.5%.

[0028] In the preferred embodiment, the mass content of HCl in the new mineral composition formed by the solid cement grinding aid is 1.1-1.83%, and the mass content of activated free water is 1-3%.

[0029] The application provides a preparation method of the solid cement grinding aid as described in the above technical solution, which comprises the following steps: mixing dust waste residue limestone powder, waste residue magnesium aluminum silicate and hydrochloric acid, stirring, and stacking and activating to obtain the solid cement grinding aid.

[0030] In the preferred embodiment, the stirring speed is 125 r / min, and the stirring time is 3 min. The purpose of stirring in the application is to realize the organic activation chemical reaction between the materials.

[0031] In the preferred embodiment, the stacking and activation temperature is room temperature, and the stacking and activation time is 24 h. The application forms new hydration minerals and new activated free water through the reaction between the materials by stacking and activation, which is helpful to obtain the cement grinding aid with excellent performance.

[0032] The application also provides an application of the solid cement grinding aid as described in the above technical solution in cement production.

[0033] In the preferred embodiment, the cement is selected from Portland cement, ordinary cement, slag cement, fly ash cement, pozzolanic cement or composite cement.

[0034] In a preferred embodiment, the incorporation amount of the solid cement grinding aid is 1-5% of the mass of the cement.

[0035] The raw materials in the embodiments of the present application are all purchased through the market route unless otherwise specified.

[0036] In the following examples and comparative examples, the dust waste residue limestone powder is purchased from Xuyi County Mining Company Limited, the waste residue magnesium aluminum silicate is purchased from Huai'an Jing Shen Company Limited, and the hydrochloric acid is purchased from Yixing Chemical Company Limited.

[0037] Example 1

[0038] A solid cement grinding aid is composed of the following raw materials in weight percentage: dust waste residue limestone powder 85%, waste residue magnesium aluminum silicate 12%, and hydrochloric acid 3%; wherein the mass content of CaO in the dust waste residue limestone powder is 18.61%, the mass content of SiO2 is 16.52%; the mass content of MgAl2SiO6 in the waste residue magnesium aluminum silicate is 76.31%; and the mass content of HCl in the hydrochloric acid is 36.5%.

[0039] The preparation method of the above-mentioned solid cement grinding aid has the following specific steps: the dust waste residue limestone powder, the waste residue magnesium aluminum silicate, and the hydrochloric acid are put into a mixing stirrer, stirred at 125 r / min for 3 min to prepare solid cement grinding aid fine particles, then stacked and activated at room temperature for 24 h to obtain a new solid cement grinding aid with a mass content of HCl of 1.1% and a mass content of activated free water of 1.1%.

[0040] The solid cement grinding aid in Example 1 is used in the production of Portland cement, ordinary cement, slag cement, fly ash cement, pozzolan cement, and composite cement respectively according to an incorporation amount of 1%, and then detected according to the technical requirements in the national cement grinding aid GB / T26748-2011 standard, and the detection results are shown in Table 1.

[0041] Table 1

[0042]

[0043]

[0044] Example 2

[0045] A solid cement grinding aid is composed of the following raw materials in weight percentage: dust waste residue limestone powder 85%, waste residue magnesium aluminum silicate 12%, and hydrochloric acid 3%; wherein the mass content of CaO in the dust waste residue limestone powder is 18.61%, the mass content of SiO2 is 16.52%; the mass content of MgAl2SiO6 in the waste residue magnesium aluminum silicate is 76.31%; and the mass content of HCl in the hydrochloric acid is 36.5%.

[0046] The preparation method of the solid cement grinding aid is as follows: the dusted waste residue limestone powder, the waste residue magnesium aluminum silicate and hydrochloric acid are put into a mixing stirrer, stirred at 125 r / min for 3 min to prepare solid cement grinding aid fine particles, and then the solid cement grinding aid fine particles are stacked and activated at room temperature for 24 h to obtain the solid cement grinding aid with the mass content of HCl in the new mineral composition being 1.46% and the mass content of activated free water being 1.9%.

[0047] The solid cement grinding aid in Example 2 is used in the production of Portland cement, ordinary cement, slag cement, fly ash cement, pozzolanic cement and composite cement respectively according to the mixing amount of 3%, and then detection is carried out according to the technical requirements in the national cement grinding aid GB / T26748-2011 standard, and the detection results are shown in Table 2.

[0048] Table 2

[0049]

[0050]

[0051] Example 3

[0052] A solid cement grinding aid is composed of the following raw materials in percentage by weight: dusted waste residue limestone powder 90%, waste residue magnesium aluminum silicate 5% and hydrochloric acid 5%; wherein the mass content of CaO in the dusted waste residue limestone powder is 18.61%, the mass content of SiO2 is 16.52%; the mass content of MgAl2SiO6 in the waste residue magnesium aluminum silicate is 76.31%; and the mass content of HCl in the hydrochloric acid is 36.5%.

[0053] The preparation method of the solid cement grinding aid is as follows: the dusted waste residue limestone powder, the waste residue magnesium aluminum silicate and hydrochloric acid are put into a mixing stirrer, stirred at 125 r / min for 3 min to prepare solid cement grinding aid fine particles, and then the solid cement grinding aid fine particles are stacked and activated at room temperature for 24 h to obtain the solid cement grinding aid with the mass content of HCl in the new mineral composition being 1.83% and the mass content of activated free water being 2.9%.

[0054] The solid cement grinding aid in Example 3 is used in the production of Portland cement, ordinary cement, slag cement, fly ash cement, pozzolanic cement and composite cement respectively according to the mixing amount of 5%, and then detection is carried out according to the technical requirements in the national cement grinding aid GB / T26748-2011 standard, and the detection results are shown in Table 3.

[0055] Table 3

[0056]

[0057]

[0058] From Table 1 to Table 3, it can be seen that the solid cement grinding aid provided by the application can replace liquid grinding aids in the market for the production of cement, and has good grinding effect, high cement strength, small water demand, normal or slightly fast setting time, large fluidity and small dry shrinkage, and the quality exceeds the technical requirements of national standard grinding aids.

[0059] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any changes or replacements within the technical scope disclosed by the present application can be easily thought of by those skilled in the art, and should be covered within the protection scope of the present application.

Claims

1. A solid cement grinding aid, characterized in that, The raw materials include the following weight percentages: 85-90% limestone powder, 5-12% magnesium aluminum silicate, and 3-5% hydrochloric acid.

2. The solid cement grinding aid according to claim 1, characterized in that, The limestone powder in the dust waste residue contains 18.61% CaO and 16.52% SiO2 by mass.

3. The solid cement grinding aid according to claim 1, characterized in that, The mass content of MgAl2SiO6 in the waste magnesium aluminum silicate is 76.31%.

4. The solid cement grinding aid according to claim 1, characterized in that, The hydrochloric acid contains 36.5% HCl by mass.

5. The solid cement grinding aid according to claim 1, characterized in that, The new mineral composition formed by the solid cement grinding aid has an HCl content of 1.1-1.83% and an activated free water content of 1-3%.

6. The solid cement grinding aid according to claim 1, characterized in that, The solid cement grinding aid comprises the following raw materials by weight percentage: 86-90% limestone powder (dust and waste residue), 5-10% magnesium aluminum silicate (waste residue), and 4-5% hydrochloric acid.

7. A method for preparing a solid cement grinding aid as described in any one of claims 1 to 6, characterized in that, Includes the following steps: The solid cement grinding aid is obtained by mixing limestone powder, magnesium aluminum silicate, and hydrochloric acid, followed by stirring and activation by stacking.

8. The method for preparing the solid cement grinding aid according to claim 7, characterized in that, The stirring speed is 125 r / min, and the stirring time is 3 min; and / or, The temperature for the stacking activation is room temperature, and the stacking activation time is 24 hours.

9. The application of the solid cement grinding aid as described in any one of claims 1 to 6 in cement production.

10. The application according to claim 9, characterized in that, The amount of the solid cement grinding aid added is 1-5% of the cement mass.

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