阅读说明：本技术 一种水泥助磨剂及其制备方法 (Cement grinding aid and preparation method thereof ) 是由 刘品 张桂 于 2019-11-27 设计创作，主要内容包括：本发明公开了一种水泥助磨剂,其以三乙醇胺、多元醇、改性单氰胺、纸浆、糖蜜、生化废液、表面活性剂、硅酸镁以及水作为原料制备,制备时先将水、三乙醇胺、改性单氰胺加入反应釜内搅拌反应后加入多元醇继续搅拌得到混合物；然后向混合物中加入纸浆、糖蜜以及硅酸镁,将反应釜控制在75~80℃、600~900r/min的条件下,搅拌后保温静置,加入生化废液、表面活性剂搅拌反应10~15min后得到水泥助磨剂。本发明制作成本低,可以明显提高磨机系统的粉磨效率,诱导水泥的水化反应,提高水泥各龄期强度。(The invention discloses a cement grinding aid which is prepared by taking triethanolamine, polyalcohol, modified cyanamide, paper pulp, molasses, biochemical waste liquid, a surfactant, magnesium silicate and water as raw materials, adding the water, the triethanolamine and the modified cyanamide into a reaction kettle for stirring reaction, then adding the polyalcohol for continuous stirring to obtain a mixture, then adding the paper pulp, the molasses and the magnesium silicate into the mixture, controlling the reaction kettle at the temperature of 75 ~ 80 ℃ and the temperature of 600 ~ 900r/min, stirring, then keeping the temperature and standing, adding the biochemical waste liquid and the surfactant for stirring reaction for 10 ~ 15min to obtain the cement grinding aid.)

1. The cement grinding aid is characterized by comprising the following raw materials in percentage by mass:

triethanolamine 17 ~ 22%

15 percent of polyol 15 ~ 20 percent

Modified cyanamide 5 ~ 10%

Paper pulp 8 ~ 12%

Molasses 8 ~ 10%

15% of biochemical waste liquid 15 ~ 20%

Surfactant 5 ~ 8%

Magnesium silicate 3 ~ 5%

The balance of water.

2. The cement grinding aid as claimed in claim 1, wherein the pulp is waste paper pulp obtained after waste paper recovery processing, and the content of fiber solids in the pulp is 15 ~ 18%.

3. The cement grinding aid according to claim 1, wherein the surfactant is a mixture of any one or more of disodium lauryl sulfosuccinate, disodium cocomonoethanolamide sulfosuccinate, and monolauryl phosphate.

4. The cement grinding aid as claimed in claim 1, wherein the biochemical waste liquid is waste fermentation liquid of forest waste.

5. The cement grinding aid as claimed in claim 1, wherein the biochemical waste liquid is a biochemical waste liquid modified by a sodium hydroxide solution.

6. The cement grinding aid according to claim 1, wherein the polyol is a mixture of any one or more of ethylene glycol, glycerol and pentaerythritol.

7. The cement grinding aid as claimed in claim 1, wherein an antifoaming agent is added to the cement grinding aid in an amount of 0.1 ~ 0.3.3% based on the total amount of raw materials.

8. The cement grinding aid as claimed in claim 1, wherein the cement grinding aid is added in use in a weight ratio of 0.05% ~ 0.1.1% of the raw material of the cement powder.

9. A preparation method of a cement grinding aid is characterized by using the components of claim 1 in parts by mass as raw materials for preparation, and specifically comprises the following operation steps:

s1, adding water, triethanolamine and modified cyanamide into a reaction kettle, stirring for 30 ~ 40min at the rotating speed of 150 ~ 300r/min, then adding polyol, and stirring for 90 ~ 120min at the rotating speed of 600 ~ 900r/min to obtain a mixture;

s2, adding paper pulp, molasses and magnesium silicate into the mixture obtained in the S1, controlling the reaction kettle at 75 ~ 80 ℃ and 600 ~ 900r/min, stirring for 90 ~ 120min, then keeping the temperature and standing for 60 ~ 90min, adding biochemical waste liquid and surfactant, stirring and reacting for 10 ~ 15min, and obtaining the cement grinding aid.

Technical Field

The invention relates to the field of additives in cement production technology, in particular to a cement grinding aid and a preparation method and application thereof.

Background

With the implementation of the strategy of sustainable development, the development of the cement industry is greatly restricted by the problems of resources, energy and environment. When cement is produced by cement production enterprises, in order to solve the problems of over-high power consumption and low grinding efficiency in the cement production process, a cement grinding aid is usually added during cement grinding to aid grinding, the cement grain gradation can be improved by a small amount of the cement grinding aid, the grinding efficiency and the cement quality index are improved, and meanwhile, the grinding aid also has the effects of improving the cement strength and reinforcing the performance in a certain aspect, the use amount of cement clinker is reduced, the energy consumption is reduced, and the emission of atmospheric pollutants is reduced.

At present, the cement grinding aids researched and applied in China mainly comprise amines, alcohols, alcamines, lignosulphonates, fatty acids and salts thereof and alkyl sulfonate substances, and have unstable quality, large mixing amount and poor strength stability. Meanwhile, the problem of higher purchase price exists, and the production cost control of the cement grinding aid is restricted.

Therefore, the research and development of the cement grinding aid which has high performance and good stability, can improve the energy utilization rate and the cement strength is very important.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a cement grinding aid and a preparation method thereof, so as to solve the defects in the background technology.

The technical problem solved by the invention is realized by adopting the following technical scheme:

the cement grinding aid comprises the following raw materials in percentage by mass:

triethanolamine 17 ~ 22%

15 percent of polyol 15 ~ 20 percent

Modified cyanamide 5 ~ 10%

Paper pulp 8 ~ 12%

Molasses 8 ~ 10%

15% of biochemical waste liquid 15 ~ 20%

Surfactant 5 ~ 8%

Magnesium silicate 3 ~ 5%

Balance of water

By way of further limitation, the pulp may be used as a waste paper pulp after a waste paper recycling process, and the content of fiber solids in the pulp is not less than 10%, preferably 15 ~ 18%.

As a further limitation, the surfactant is a mixture of any one or more of disodium lauryl sulfosuccinate, disodium cocomonoethanolamide sulfosuccinate, and monolauryl phosphate.

For further limitation, the biochemical waste liquid is preferably waste fermentation liquid of forest waste, that is, waste fermentation liquid obtained by landfill fermentation of parts of woody plants with high lignin content, such as roots, stems, branches and the like.

As a further limitation, the biochemical waste liquid may be modified by mixing with a sodium hydroxide solution.

As a further limitation, the polyhydric alcohol is any one or a mixture of more of ethylene glycol, glycerol and pentaerythritol.

As a further limitation, the cement grinding aid can also be added with an antifoaming agent accounting for 0.1 ~ 0.3.3 percent of the total amount of raw materials to reduce the generation of foams.

In the invention, when the cement grinding aid is used, the cement grinding aid is added according to the weight ratio of 0.05 percent to ~ 0.1.1 percent of the raw material of cement powder, and then the cement powder is ground.

The preparation method of the cement grinding aid comprises the following specific operation steps:

s1, adding water, triethanolamine and modified cyanamide into a reaction kettle, stirring for 30 ~ 40min at the rotating speed of 150 ~ 300r/min, then adding polyol, and stirring for 90 ~ 120min at the rotating speed of 600 ~ 900r/min to obtain a mixture;

s2, adding paper pulp, molasses and magnesium silicate into the mixture obtained in the S1, controlling the reaction kettle at 75 ~ 80 ℃ and 600 ~ 900r/min, stirring for 90 ~ 120min, then keeping the temperature and standing for 60 ~ 90min, adding biochemical waste liquid and surfactant, stirring and reacting for 10 ~ 15min, and obtaining the cement grinding aid.

Has the advantages that: the cement grinding aid disclosed by the invention is low in raw material cost, overcomes the problems that the water demand of cement is increased, the strength is reduced, the compatibility of the cement and a water reducing agent is poor, the production cost is high and the like in the conventional grinding aid, can be stored for a long time, is used for producing general portland cement with different grades, can effectively improve the yield of a mill, can effectively reduce the over-grinding phenomenon, optimizes the cement particle size distribution, improves the flowability of the cement, improves the grinding fineness and the specific surface area of the cement powder, effectively eliminates the phenomena of electrostatic adsorption and ball coating and pasting of cement fine particles, and has an obvious effect of enhancing the compressive strength of the cement in two hardening stages (3 days and 28 days).

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.