Analysis of factors affecting cement clinker strength and effective ways to improve its strength Henan Hongxing

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Analysis of factors affecting cement clinker strength and effective ways to improve its strength

At present, cement production is generally adopted New dry process cement production process In this process, the strength of cement clinker is an important index of its production. In this paper, the factors of applying cement clinker strength are analyzed, and the effective measures to effectively improve the clinker strength are proposed.

 New dry process cement production process

Analysis of factors affecting cement clinker strength

1. Saturation ratio of raw meal into kiln

With the increase of the saturation ratio of raw meal, although the content of C3S in the clinker out of the kiln is increased, the calcination is difficult, the heat consumption is increased, the crust at the kiln tail is aggravated, and the ventilation in the kiln is not good. In addition, the free calcium content of the clinker is correspondingly increased from less than 1.5% to about 1.8%, resulting in the decrease of 28d compressive strength.

2. Clinker granulation

Clinker granulation is not good, and there are more fly sand materials Rotary kiln The ventilation resistance in the kiln reduces the combustion space of pulverized coal and the intensity of flame, which leads to the poor sintering condition of clinker, and finally leads to the decrease of 28d clinker strength.

3. Cooling effect of cooler

Because C3S is stable in the temperature range of 1250-2065 ℃, decomposition will occur below or above this range, which will affect the 28d strength of clinker.

4. Influence of MgO in clinker

High MgO content will reduce the calcining temperature, reduce the melting point of materials and increase the liquid volume, which is beneficial to the calcination of materials; however, it may lead to the reduction of coal feeding amount and the decrease of calcination temperature, which makes the formation of C3S relatively difficult due to lack of heat and affects the strength of clinker.

5. Influence of reducing atmosphere in rotary kiln

Ways to improve the strength of cement clinker

Through the above analysis of the factors affecting the strength of cement clinker, we put forward the effective ways to improve the strength of cement clinker

1. Pre homogenization control of raw materials

To control the Cao and MgO content of limestone, in addition to the calorific value and internal water content of bituminous coal, the total sulfur in bituminous coal has a greater impact on the calcination and clinker, so it is necessary to strengthen the control of total sulfur in bituminous coal.

2. Determine the reasonable proportioning scheme

The key to the proportioning scheme is whether it can be well implemented. If the actual rate fluctuates greatly, no matter how good the proportioning scheme is, it will not produce good clinker. The premise of high-strength kiln is to sum up the conditions of clinker burning.

At the same time, if the sintering conditions permit, the silicate rate and silicate mineral content should be appropriately increased. After the implementation of this proportioning scheme, the kiln firing condition is good, the strength is stable, and the average value of 28 days is 58.9mpa.

3. Strictly control pulverized coal

Because of the long black head, in order to speed up the combustion speed and fully burn the pulverized coal, the fineness of the pulverized coal is 6.0% and the moisture content is 2.0%.

4. Reasonable control of ventilation in kiln

Good ventilation in the kiln is an important condition to ensure the clinker calcination. The sintering temperature of clinker is about 1450 ℃, that is to say, white flame should be seen when looking at the kiln head. Higher calcination temperature makes the crystal structure of clinker more reasonable, which is more conducive to C2S absorption of calcium oxide. However good raw meal has low kiln temperature, it is also difficult to form C3S, which is very important but often ignored.

5. Strengthen the management of calcination and cooling process

The calcination atmosphere in the kiln directly affects the strength of clinker. By reducing the fineness of pulverized coal, adjusting the opening of tertiary air duct, and controlling the temperature of secondary and tertiary air, the complete combustion of pulverized coal is ensured without reducing atmosphere. In addition, the stability of raw material feeding into the kiln is the premise to ensure the stability of raw material.

To ensure the clinker rapid cooling is also an essential condition to ensure the stability of clinker strength. We adopt the method of intermediate layer thickness and appropriately reduce the proportion of liquid phase in the clinker, improve the silica rate, avoid clinker agglomeration, make the clinker particles small, easy to cool, make the clinker quench, the mineral crystal development of clinker is good, so that the early and late strength of clinker and 3-28 days increase rate are better.

6. Pay attention to the maintenance and overhaul of main thermal equipment

Grate cooler is the core equipment to ensure the rapid cooling of clinker. The premise is to ensure the normal operation of fan and the good working condition of grate plate. Especially the ventilation of grate plate and grate joint in extremely cold area. The roots blower should not be changed at will according to the design power. It mainly monitors the load of Roots blower to ensure the stability of load and reflects the uniform conveying of pulverized coal in the kiln.

In a word, equilibrium and stability is the key to improve clinker strength. In today's energy-saving construction, improving clinker strength is of far-reaching significance. The cement equipment produced by our company is advanced, which can ensure the strength of cement clinker, Welcome to buy

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