Cement plant to improve late strength analysis of clinkerDate: 2019-06-24 Views:
According to the actual situation of cement plant production, the following analysis is made on how to improve the strength of clinker in the later stage:
1. Analysis of clinker mineral strength
First, clinker is a multi - mineral crystalline fine artificial rock.
According to the theory of single mineral strength development, C3S is the mineral that contributes the most to the strength of clinker.
1.1 reasonable batching scheme
From most cement plant batching plans to see a big difference, "three high" batching, "two high and one medium" batching, "one high and one low" batching, more schemes, but the impact on the strength of clinker is relatively small, most of these batching plans after the implementation of 28 days can be burned in the strength of 55MPa above the clinker.
The mixing scheme must serve the calcination of the kiln, and a good kiln condition is the prerequisite for firing high strength clinker.
1.2 control of clinker index
The best control value of free calcium is between 0.5% and 1.5%, but less than 0.5%.
Vertical lifting weight is an important index to reflect the physical properties of clinker.
2. Attach importance to ventilation in kiln
Good ventilation in the kiln is an important condition to ensure the calcination of clinker. The temperature of the clinker is about 1450℃.
To ensure the ventilation in the kiln, a strict cleaning system should be formulated for the smoke chamber at the end of the kiln and the shrinkage of the decompression furnace to reasonably control the distribution of kiln skin. The adjustment of kiln wind should be timely adjusted according to the condition of kiln skin to ensure the balance of kiln wind.
In addition, attention should be paid to the wear condition of the air valve for three times. Large wear will lead to large air volume for three times and a reducing atmosphere will be generated in the kiln. Similarly, large amount of material accumulated in the air pipe for three times will lead to insufficient air volume in the decomposition furnace, which will affect the decomposition efficiency of materials.
3 Control the quality of raw fuel
The harmful components in raw fuel should be controlled within a reasonable range and the incorporation of harmful elements should be reduced as much as possible. These elements can theoretically reduce the minimum eutectic temperature of clinker, but have a great impact on the hydration rate of minerals, kiln conditions, etc., and also have an impact on the strength of clinker.
Ensure that each batch of raw materials have sufficient quantity, in order to carry out a reasonable homogenization.
4 Effect of magnesium oxide on strength of clinker
Magnesium oxide content in the thermal system will be affected the stove, if high magnesium oxide content in the thermal system is stable, but the stove clinker strength is not affected, after calcined magnesium oxide can form solid solution in the glass phase, information studies prove about solid solution in 2.0% or so, it is under the influence of cooling condition is very big, when the calcined magnesia material, must ensure the clinker cooling, the more the magnesia clinker exists in the form of tiny crystals or vitreous, to minimize the impact of magnesium oxide.
5 The influence of raw coal on the strength of clinker
Raw coal must first provide enough heat, and then fully combustion in the rotary kiln, which is closely related to the process management of each company and the use of equipment, especially the burner.
The above points are my summary of improving clinker strength.