cement will be implemented on June 1, in which the cement composition, strength and fineness have been adjusted. With the approaching of time, cement enterprises have also begun to adjust the formula to wash the cement silo and adapt to the market promotion.
So why is the cost of cement production increased after the implementation of the new national standard? In the following, we analyze from the three aspects of composition, strength and fineness:
1. This is a mandatory requirement for cement composition, and there is a mandatory minimum requirement for clinker + gypsum ratio. In the past, only the strength was required to meet the standard, and there was no mandatory requirement for composition. This makes some cement enterprises increase the amount of clinker to meet the requirements of the new standard, and increasing the amount of clinker is to increase the cost of cement.
For example, for P.O425 cement varieties with the largest production usage at present, the new standard requires that the ratio of clinker + gypsum components should not be less than 80%, the amount of gypsum is generally about 5%, and the amount of clinker should not be less than 75%, which requires increasing the ratio of clinker for some cement enterprises with large amount of mineral powder (slag) in the past. It is understood that in some areas with abundant mineral powder (slag) resources, the amount of P.O42.5 cement mineral powder is mostly more than 10%, and the amount of individual enterprises is more than 15% or even more. For these enterprises, it is necessary to improve the clinker ratio to ensure that the total ratio of clinker and gypsum is more than 80%. Similarly, for P.F32.5 and P.P32.5 grade cement, At present, the proportion of clinker and gypsum is required to be no less than 60%. It is known that the proportion of some small grinding stations is far below this standard in the past, and the strength can meet the requirements. After the implementation of the new standard, the amount of clinker must be increased, and the cost will be increased accordingly. The new national standard of
2、 also has strict requirements on the composition of the components. It does not allow the use of cheap admixture resources such as steel slag, manganese slag and lithium slag, which were previously used in some areas. It must be replaced by admixture materials such as mineral powder (slag), fly ash, pozzolana and limestone, which are allowed by the new national standard. This will also increase the cost of cement production. The new national standard of
3、 has improved the three-day strength of some cements, for example, the three-day strength of P.F32.5 and P.P32.5 cements has been improved from 10 MPa to 12 MPa, so it is necessary to increase the clinker addition to meet the standard requirements. The fineness of
4、 to ordinary Portland cement, Portland slag cement, Portland fly ash cement, Portland pozzolana cement and composite Portland cement shall be represented by the residue on the 45 μm square sieve, which shall not be less than 5%. In this way, some cement enterprises are prevented from improving the strength by grinding more finely, so as to achieve the purpose of saving the use of clinker, thus indirectly increasing the use of clinker and increasing the production cost of cement.
Summary: After the implementation of the new national standard, the cement production cost of most enterprises will definitely increase, but the specific amount of increased cost depends on the factory and the variety, and there will be a big difference according to the price of mixed materials and the manufacturing cost of clinker in different places. From a nationwide perspective, it is estimated that the manufacturing cost of cement per ton for most manufacturers will increase by 10-30 yuan.
Actively promoting the upgrading of large-scale production equipment and actively promoting the energy-saving technological innovation and environmental protection upgrading and transformation of the cement industry have immeasurable strategic significance and practical effectiveness for enhancing the core competitiveness of cement enterprises and realizing the grand blueprint of sustainable development of the cement industry.
To this end, China Cement Network will hold the 11th China Cement Energy Conservation and Environmental Protection Technology Exchange Conference-Equipment Renewal Forum in Nanjing, Jiangsu Province on June 13-14 . This forum will gather government leaders, industry technical specialist, scientific research institutions, universities, cement enterprises and equipment suppliers to discuss and analyze the practical path of equipment renewal and green upgrading in the cement industry, so as to promote the industry to move towards a more energy-efficient, greener and environmentally friendly future.
