Special cement development report during the 13th Five-Year Plan period

Fourth, continue to build a standard system

In order to support the continuous R&D innovation and high-quality development of the special cement industry, the standard system of special cement is also continuously updated, for innovative special cement varieties, formulate national/industry standards, for the quality improvement of existing varieties, revise national/industry standards, and improve the corresponding technical requirements and testing methods. From 2016 to 2020, a total of 5 national standards have been formulated and 4 national standards revised; Completed building materials industry standard formulation 1, building materials industry standard revision 1. As of December 2020, 3 national standard systems/revisions and 3 building materials industry standard systems/revisions are being carried out.

Five, carbon neutral carbon emission and low-carbon special cement varieties

The main CO2 emission sources in cement production are:

1) Carbonate decomposition in raw materials;

2) Combustion of fuel;

3) Power consumption of each process equipment.

About 60% of the CO2 emitted in the production of general purpose Portland cement comes from carbonate decomposition, and about 40% comes from fuel combustion and power consumption. The C3S mineral content in general Portland cement clinker is generally about 60%, and because the C3S firing temperature is higher, and the proportion of calcium carbonate in the ingredients is larger, the production energy consumption is higher, and the emissions of CO2 and NOx are also larger. Therefore, to achieve the low-carbon production of cement, the following two technical approaches can be adopted:

First, reduce the amount of CO2 generated by energy consumption, that is, within the scope of the general Portland cement system and its mineral composition, improve the production process and equipment level by regulating the flammability and grindability of raw materials, and reduce the energy consumption of the cement production process;

The second is to reduce the amount of CO2 produced by carbonate decomposition, that is, break through the limitations of the existing Portland cement clinker mineral system and its mineral composition range, reduce the content of high calcium minerals and increase the content of low calcium minerals or introduce other low calcium mineral components, and research and develop a new low-carbon cement system.

At present, the cement industry in the first way has made good progress, a series of energy saving and emission reduction technology has been widely used, under the existing technology conditions, relying on process technology and equipment level transformation to further achieve energy saving and emission reduction has been very difficult, and the research and development of low-carbon cement varieties has become a hot spot in the field of cement material science.

Low-carbon special cement products mainly include:

1) High Belite Portland cement (low-heat Portland cement, referred to as "low-heat cement");

2) sulfoaluminate (ferric) cement;

3) Portland cement with low clinker coefficient and specific properties, that is, Portland cement clinker, special Portland cement made by mixing materials with specific properties, the mixing amount of mixed materials can be up to 70%, such as slow setting Portland cement for road base, Marine Portland cement, low-heat micro-expansion cement, etc.

Sixth, the "14th Five-Year Plan" period of special cement industry challenges and opportunities coexist

The 14th Five-Year Plan period is the first five years in which China, after completing the building of a moderately prosperous society in all respects and achieving the first centenary goal, embarked on a new journey to fully build a modern socialist country and march toward the second centenary goal. "14th Five-Year Plan" period of special cement industry challenges and opportunities coexist.

1. From the perspective of challenges:

Cement industry is still resource-based, high energy consumption and consumption of environmental resources more industry, the state advocates the concept of green development, emphasizing that "green water and green mountains is gold and silver mountains". As part of the cement industry, special cement also has social responsibility requirements and also faces the same or even more stringent challenges.

(1) The future environmental requirements will be more stringent on the existing basis, a number of provinces and autonomous regions have issued ultra-low emission policy requirements, and special cement will no longer enjoy special treatment, technology, equipment, environmental protection and other requirements have reached the advanced level of the industry, as the entire industry is facing "carbon peak" "carbon neutral" tremendous pressure.

(2) The difficulty and cost of obtaining resources are getting higher and higher. Mine acquisition cycle is long, many links, complicated procedures, more and more difficult, and mine resources continue to auction high prices, the cost of resources will be higher and higher.