CN102249571A - Energy-saving composite white cement - Google Patents

Abstract

The application discloses an energy-saving composite white cement, which belongs to the field of building materials, and is composed of calcined and bleached white Portland cement clinker, raw gypsum and quicklime accounting for 5-10% of the total weight of white cement, accounting for 5% to 10% of the total weight of white cement. 20-30% by weight of white electric furnace reduced slag or white granulated blast furnace slag or white electric furnace reduced slag and white granulated blast furnace slag, and talcum powder accounting for 5-10% of the total weight of white cement are jointly ground. The white cement has the advantages of low production cost, low production energy consumption and light environmental pollution.

Description

A kind of energy-saving composite white cement

technical field

This application belongs to building materials.

Background technique

At present, the raw materials and production process of white Portland cement (hereinafter referred to as white cement) are as follows:

1. Mix the crushed limestone and dried clay according to the proportion;

2. After batching, enter the raw material mill for grinding, grind into raw material, and then send it to the rotary kiln for calcination, and burn it into white cement clinker;

3. After the white cement clinker leaves the kiln, immediately bleach it with cold water;

4. Crush the bleached white cement clinker and mix it with high-quality raw gypsum according to a certain ratio;

5. After batching, it is sent to the cement mill for grinding, and it is ground into white cement, which is packaged and shipped.

It can be seen from the above-mentioned white cement production process that almost all white cement products are white cement clinker sintered at high temperature, with only a small amount of gypsum. Therefore, white cement production consumes a lot of energy and causes serious environmental pollution, which is not conducive to energy saving. To reduce emissions, it is necessary to change the composition of white cement products and produce energy-saving white cement.

Contents of the invention

The object of the present invention is: to produce energy-saving and emission-reducing white cement, make full use of cheap materials, and reduce production cost, and its technical scheme is:

In cement raw material and production process 4, in addition to calcined bleached white cement clinker and raw gypsum, quicklime, talcum powder, white electric furnace reduced slag or white granulated blast furnace slag or white electric furnace reduced slag and white granulated slag are added in the batching process Blast furnace slag, the total amount of which is 20-40% of the total weight of white cement, including 5-10% quicklime, 5-10% talcum powder, white electric furnace reduced slag or white granulated blast furnace slag or white electric furnace reduced slag and white granular The blast furnace slag accounts for 20-30%, and the specific mixing ratio can be adjusted according to the quality of the fired white cement clinker and the label requirements of the white cement product.

Compared with the traditional white cement, this kind of white cement is mixed with quicklime, talc powder, white electric furnace slag and white granulated blast furnace slag, which significantly reduces the production energy consumption, so it is named as an energy-saving type. Composite white cement.

Advantages of the invention

The production of this variety of white cement can effectively utilize industrial waste residues such as white electric furnace reduction slag and white granulated blast furnace slag, and make full use of cheap materials such as quicklime and talcum powder to significantly reduce white cement production energy consumption and reduce white cement production costs. Reduce environmental pollution.

Claims (1)

1. energy-saving compound white cement; it is white portland cement clinker, plaster stone after being bleached by calcining and the unslaked lime that accounts for white portland cement gross weight 5～10%; account for white electric arc furnace restored slag or white granulated blast-furnace slag or the white electric arc furnace restored slag and the white granulated blast-furnace slag of white portland cement gross weight 20～30%; comprise that also its feature accounts for the talcum powder of white portland cement gross weight 5～10%, common grinding forms.