CN111116080A

CN111116080A - Calcium carbonate special grinding aid and preparation method thereof

Info

Publication number: CN111116080A
Application number: CN201911376945.2A
Authority: CN
Inventors: 柳玉强; 黄遵运
Original assignee: HANGZHOU SMART BUILDING MATERIAL TECHNOLOGY CO LTD
Current assignee: HANGZHOU SMART BUILDING MATERIAL TECHNOLOGY CO LTD
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-05-08

Abstract

The invention relates to a cement additive. The grinding aid provided by the invention can greatly improve the mixing amount of calcium carbonate mixed materials in cement, reduce the consumption of clinker and reduce the production cost; the preparation method provided has simple steps and convenient operation. The technical scheme is as follows: the special grinding aid for calcium carbonate is characterized by being prepared from the following raw materials in percentage by weight: 10-30% of an alkanolamine compound; 5-10% of sodium fatty acid; 15-25% of sodium thiocyanate; 5-10% of sodium sulfate; 5-10% of sugar density; the balance of water; the alkanolamine compound is one or a mixture of more of triethanolamine, triisopropanolamine, diethanol monoisopropanolamine, propylene glycol, ethylene glycol and glycerol in any proportion.

Description

Calcium carbonate special grinding aid and preparation method thereof

Technical Field

The invention relates to a cement additive, in particular to a special grinding aid for calcium carbonate and a preparation method thereof.

Background

With the continuous deepening of the national industrial policy, cement is listed as a key energy consumption industry and is also listed as an industry for restricting the development of the country. The national requirement is that under the condition of maintaining the current capacity unchanged, the energy consumption is reduced by 5 percent every year, so that the energy conservation and consumption reduction in the cement industry are urgently required. The best way for saving energy and reducing consumption of cement production enterprises is to develop or use more cement mixing materials, and particularly, during cement production, the cement enterprises hope to use less clinker and more mixing materials. However, with the annual increase of cement output in China, the resources of the active mixed materials (mainly slag) which are the first choice are limited, the supply is increasingly tense, and the resources of some mixed materials with lower activity, such as waste limestone and other calcium carbonate raw materials, are relatively rich, so that the active mixed materials have the advantages of low price, short transportation distance, less water content, easy acquisition and the like compared with other mixed materials, and most cement enterprises in areas where the active mixed materials of cement are in shortage hope of using more limestone in the cement to meet the requirements of production and cost reduction. If the cement admixture can be used in the cement in a mixing amount, the problems of shortage of the produced cement admixture and comprehensive utilization of mine resources can be well solved, and good economic benefits and social benefits are brought to cement enterprises.

Calcium carbonate is an inorganic compound commonly known as limestone, calcium carbonate,stone powderMarble, etc., and has a wide industrial application. In cement production, because the activity of calcium carbonate is very low, the mixing amount of calcium carbonate is generally only about 10% in order to meet the requirement of cement strength. The existing cement grinding aid has no obvious effect of enhancing calcium carbonate, and the aim of doping a large amount of calcium carbonate in cement production cannot be fulfilled. Therefore, how to increase the calcium carbonate content in the cement becomes a research hotspot in the field.

Disclosure of Invention

The invention aims to overcome the defects of the background technology and provides the special grinding aid for calcium carbonate and the preparation method thereof, and after the grinding aid provided by the invention is used, the mixing amount of calcium carbonate mixed materials in cement can be greatly increased, the clinker consumption is reduced, and the production cost is reduced; the preparation method provided has simple steps and convenient operation.

The technical scheme adopted by the invention is as follows:

the special grinding aid for calcium carbonate is characterized by being prepared from the following raw materials in percentage by weight:

10-30% of alkanolamine compound

5-10% of sodium fatty acid

15-25% of sodium thiocyanate

5 to 10 percent of sodium sulfate

5 to 10 percent of sugar density

The balance of water;

the alkanolamine compound is one or a mixture of more of triethanolamine, triisopropanolamine, diethanol monoisopropanolamine, propylene glycol, ethylene glycol and glycerol in any proportion.

Preferably, the alkanolamine compound is one or more of triethanolamine, triisopropanolamine, diethanolisopropanolamine and glycerol in any proportion.

The preparation method of the special grinding aid for calcium carbonate comprises the following steps:

adding sodium aliphatate, sodium thiocyanate and sodium sulfate into water, and stirring until the sodium aliphatate, the sodium thiocyanate and the sodium sulfate are completely dissolved; adding alkanolamine compound and sugar syrup, and stirring to obtain the final product.

In the raw materials of the formula, the molecules of the alcohol amine compound contain amino and hydroxyl, so that the alcohol amine compound has the comprehensive performance of amine and alcohol, has good dispersibility when used as a surfactant, and can also be used as an early strength agent to improve the early strength of cement; the diethanol monoisopropanolamine can ensure the early strength of the cement and improve the later strength of the cement; the sodium thiocyanate, the sodium sulfate and the sodium fatty acid can improve the early and later strength in the cement, and the addition of the saccharides can obviously improve the filling amount of calcium carbonate and greatly improve the doping amount of calcium carbonate in the cement.

The invention has the beneficial effects that:

1. the raw materials in the grinding aid provided by the invention act synergistically, so that the doping amount of calcium carbonate in cement can be greatly increased (the doping amount of calcium carbonate in cement can be increased to 25%), and the dosage of clinker is reduced; meanwhile, the early and later strength of the cement can be improved (according to estimation, the compressive strength is improved by 7-16%).

2. The calcium carbonate has rich resources, easily obtained raw materials and low price; the mixing amount is increased, and the cost of cement can be greatly reduced.

3. The preparation method provided by the invention has simple steps and is convenient and easy to operate.

Detailed Description

The present invention will be further described with reference to the following examples, but the present invention is not limited to these examples.

Example 1

Weighing the following raw materials in percentage by weight: 18% of triethanolamine, 10% of glycerol, 5% of sodium fatty acid, 5% of sodium sulfate, 15% of sodium thiocyanate, 10% of molasses and the balance of water;

adding water into a reaction kettle, sequentially adding sodium aliphatate, sodium sulfate and sodium thiocyanate, stirring until the sodium aliphatate, the sodium sulfate and the sodium thiocyanate are completely dissolved, then adding triethanolamine, glycerol and molasses, and uniformly stirring to obtain a finished product.

Example 2

Weighing the following raw materials in percentage by weight: 16% of diethanol monoisopropanolamine, 10% of glycerol, 10% of sodium fatty acid, 7% of sodium sulfate, 15% of sodium thiocyanate, 5% of molasses and the balance of water;

adding water into a reaction kettle, sequentially adding sodium fatty acid, sodium sulfate and sodium thiocyanate, stirring until the sodium fatty acid, the sodium sulfate and the sodium thiocyanate are completely dissolved, then adding diethanol monoisopropanolamine, glycerol and molasses, and uniformly stirring to obtain a finished product.

Example 3

Weighing the following raw materials in percentage by weight: 5% of triethanolamine, 5% of diethanol monoisopropanolamine, 8% of sodium fatty acid, 8% of sodium sulfate, 25% of sodium thiocyanate, 10% of molasses and the balance of water;

adding water into a reaction kettle, sequentially adding sodium fatty acid, sodium sulfate and sodium thiocyanate, stirring until the sodium fatty acid, the sodium sulfate and the sodium thiocyanate are completely dissolved, then adding triethanolamine, diethanol monoisopropanolamine, glycerol and molasses, and uniformly stirring to obtain a finished product.

Example 4

Weighing the following raw materials in percentage by weight: 5% of triisopropanolamine, 8% of diethanol monoisopropanolamine, 10% of glycerol, 5% of sodium fatty acid, 5% of sodium sulfate, 25% of sodium thiocyanate, 5% of molasses and the balance of water;

adding water into a reaction kettle, sequentially adding sodium fatty acid, sodium sulfate and sodium thiocyanate, stirring until the sodium fatty acid, the sodium sulfate and the sodium thiocyanate are completely dissolved, then adding triisopropanolamine, diethanolisopropanolamine, glycerol and molasses, and uniformly stirring to obtain a finished product.

Example 5

Weighing the following raw materials in percentage by weight: 5% of triethanolamine, 13% of triisopropanolamine, 12% of glycerol, 5% of sodium fatty acid, 5% of sodium sulfate, 15% of sodium thiocyanate, 10% of molasses and the balance of water;

adding water into a reaction kettle, sequentially adding sodium aliphatate, sodium sulfate and sodium thiocyanate, stirring until the sodium aliphatate, the sodium sulfate and the sodium thiocyanate are completely dissolved, then adding triisopropanolamine, triethanolamine, glycerol and molasses, and uniformly stirring to obtain a finished product.

Example 6

Weighing the following raw materials in percentage by weight: 13% of triisopropanolamine, 10% of glycerol, 5% of sodium fatty acid, 10% of sodium sulfate, 15% of sodium thiocyanate, 10% of molasses and the balance of water;

Composition and performance comparison table of grinding aid used in examples 1-6 of the invention and unused cement

Sample name	Clinker	Gypsum plaster	Limestone	Granulated slag	Time of day	Fineness of 0.045	The blending amount is%	3d resistance to compression	28d resistance to compression
										Blank space	65	5	25	5	33	10.32	0.01	21.3	34.1
Example 1	65	5	25	5	30	10.28	0.01	24.9	36.5
										Example 2	65	5	25	5	30	9.59	0.01	24.4	37.7
Example 3	65	5	25	5	30	9.24	0.01	23.7	37.4
										Example 4	65	5	25	5	30	9.39	0.01	24.4	37.1
Example 5	65	5	25	5	30	9.7	0.01	24.2	37.4
										Example 6	65	5	25	5	30	10.1	0.01	24.7	37.6

From the data in the above table, it can be seen that: compared with the conventional method of mixing untreated (same proportion) limestone, the compressive strength of the invention is improved by 7-16%.

Claims

1. The special grinding aid for calcium carbonate is characterized by being prepared from the following raw materials in percentage by weight:

10-30% of alkanolamine compound

5-10% of sodium fatty acid

15-25% of sodium thiocyanate

5 to 10 percent of sodium sulfate

5 to 10 percent of sugar density

The balance being water.

2. The professional grinding aid for calcium carbonate according to claim 1, wherein the grinding aid is characterized in that: the alkanolamine compound is one or a mixture of more of triethanolamine, triisopropanolamine, diethanol monoisopropanolamine, propylene glycol, ethylene glycol and glycerol in any proportion.

3. The professional grinding aid for calcium carbonate according to claim 2, wherein the grinding aid comprises: the alkanolamine compound is one or a mixture of more of triethanolamine, triisopropanolamine, diethanol monoisopropanolamine and glycerol in any proportion.

4. The preparation method of the calcium carbonate professional grinding aid as claimed in claim 1, which is characterized in that: