New low-carbon cement reduces carbon emissions by more than 50%

Wuhan University of Technology recently revealed that Professor Lin Zongshou’s technology at the school’s School of Materials Science and Engineering can significantly reduce carbon emissions from cement production. According to reports, traditional cement production processes consume large amounts of energy and emit large amounts of carbon dioxide. Prof. Lin Zongshou's low-carbon cement production technology can significantly reduce carbon emissions and reduce cement production costs without affecting cement performance. At present, this technology has been promoted in seven cement plants in Hunan, Yunnan, Jiangxi and Shanxi provinces.

Prof. Lin Zongshou introduced to reporters that low-carbon cement technology replaces clinker with industrial waste (such as steel slag, slag, fly ash, etc.) that have been treated with process technology during the grinding of cement clinker to reduce the clinker content of cement. , thereby reducing energy consumption and carbon emissions in the cement production process. Because in the cement production process, high energy consumption and carbon emissions are mainly generated during the firing of clinker, the amount of cement clinker is reduced, which in turn reduces its energy consumption and carbon emissions.

Low-carbon cement is not a single type of cement. Prof. Lin began research in 85 years. After more than 30 years of experimental research and development, he has successfully developed a series of low-carbon cements: high-performance low-cement cement, steel slag-based low-carbon cement. , Phosphogypsum-based steel slag cement, limestone-based calcined low-carbon cement, waste concrete-based recycled cement, removal of gypsum-based steel slag slag cement. The phosphogypsum cement can be used directly without clinker, and it can be processed directly with the processed slag grinding. Once it is popularized and applied, it will completely break the “two-burning and one-burning” of the traditional cement process, and can be produced only by “one grinding”. Low-carbon and environmentally friendly cement. Since the cement without clinker is a brand-new breed, the country has not yet issued relevant standards. Prof. Lin presided over the compilation of its standards and has been listed in the national “863” plan.

Compared with traditional cement, low-carbon cement has the following characteristics and advantages:

1. Reduction of carbon emissions by more than 50% It is understood that in general cement production technology, P. C32.5 cement clinker content is more than 50%, P. O42.5 cement clinker content is more than 80%, and P. O52.5 grade cement mortar dosage is as high as 95%. However, after the application of low-carbon cement technology, the clinker content of 15% can reach P. C32.5 cement grade; clinker content 25%, can reach P. O42.5 cement grade; clinker content 35%, can reach P. O52.5 cement grade. It can be seen that when producing cement of the same grade, the amount of low-carbon cement clinker is greatly reduced, with a reduction of more than 50%. Because cement clinker production and carbon dioxide emissions are basically 1..1, this means that carbon dioxide emissions are reduced by more than 50%, and the effect of energy conservation and emission reduction is very significant.

2. Significantly reduce production costs Prof. Lin Zongshou pointed out that the cement performance produced by using low-carbon cement technology is basically the same as that of traditional cement, and it conforms to various technical standards set by the state and is widely used. Due to the high production cost of cement clinker, the cost of industrial waste slag is very low. Low-carbon cement uses industrial waste slag to replace clinker, which greatly reduces the cost of cement production while saving energy and reducing emissions: P. The cement cost of C32.5 decreased by 40-60 yuan/ton, P. O 42.5 cement costs have dropped 80-150 yuan / ton. The overcapacity in the cement industry is serious. In many regions, competition is fierce. The price war has intensified and the cost of low-carbon cement has drastically decreased, which has greatly increased the competitiveness of cement companies.

3. The convenience of the transformation of the production line Professor Lin said: When using low-carbon cement technology, there is no need to build a new supporting cement plant, which can be directly transformed in the traditional cement production line, mainly to modify the cement grinding equipment, and the clinker production line remains unchanged. It costs only a few hundred thousand. At present, this technology has been promoted in seven cement plants in Hunan, Yunnan, Jiangxi, and Shanxi provinces, of which two are new cement production lines, and the remaining five are directly put into production after transformation and have achieved good results. .

At present, the cement industry has a serious surplus of production capacity and the development prospects are not very clear. In view of the development of the cement industry, Dean Liu Changfa of the Planning and Research Institute of Building Materials Industry of China once pointed out that only deep farming and intensive cultivation of products and markets can solve the current difficulties of the cement industry. Professor Lin Zongshou's low-carbon cement is the result of more than 30 years of his deep plowing of cement technology, which has played a powerful role in the transformation, upgrading, and reform of the cement industry.