Cement preparation method

Abstract

A cement preparation method comprises the following steps: 1, removing partial magnetic substance from a blocky mixture and a retarder through using a first permanent magnetic iron separator, crushing to the particle size of the blocky mixture to below 40mm through using a crusher (2), and respectively storing in storage warehouses; 2, directly putting a clinker and the obtained particulate or granular mixture in a storage warehouse; 3, allowing cement raw materials in the storage warehouses, comprising the clinker, the mixture and the retarder to enter a burdening system, removing partial magnetic substances from the obtained burdened mixture through using a second permanent magnetic iron separator, sending to a vertical mill, and pre-grinding; 4, further removing partial magnetic substances from the obtained pre-ground powder through using a third permanent magnetic iron separator, and sending to a powder separator for powder grading; and 5, sending the separated fine powder to a tube mill for cement final-grinding, returning the obtained coarse powder to the vertical mill for cycle grinding, directly sending the obtained powdery mixture and the retarder to the tube mill, and grinding the powdery mixture, the retarder and the separated fine powder in the tube mill to form cement.

Description

technical field [0001] The invention relates to a cement preparation process, in particular to a cement powder grinding process. Background technique [0002] In the field of cement grinding, due to the low energy utilization rate and grinding efficiency of the tube mill, it is gradually replaced by high-efficiency grinding equipment in terms of energy-saving grinding. It is superior and cannot be replaced by other high-efficiency grinding equipment at present. Therefore, roller presses, vertical mill pre-grinding and semi-final grinding systems have become the mainstream of development. [0003] The force body of the vertical mill is a column-plate, and the energy utilization rate of the column-plate is relatively high. Using the vertical mill to replace the first chamber crushing function of the tube mill has achieved very good results in cement grinding, so the vertical mill pre The grinding system has been developed, but the vibration of the vertical mill has always bee...

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Problems solved by technology

[0002] In the field of cement grinding, due to the low energy utilization rate and grinding efficiency of the tube mill, it is gradually replaced by high-efficiency grinding equipment in terms of energy-saving grinding. It is superior and cannot be replaced by other high-efficiency grinding equipment at present. Therefore, roller presses, vertical mill pre-grinding and semi-final grinding systems have become the mainstream of development.

[0003] The force body of the vertical mill is a column-plate, and the energy utilization rate of the column-plate is relatively high. Using the vertical mill to replace the first chamber crushing function of the tube mill has achieved very good results in cement grinding, so the vertical mill pre The grinding system has been developed, but the vibration of the vertical mill has always been a problem that plagues its stable operation. When there are large particles and metal impurities in the material entering the vertical mill, the vertical mill will vibrate with a large amplitude, and in severe cases, the vertical mill will vibrate. Stopping will not only affect the stable operation of the vertical mill, but also metal and other difficult-to-grind impurities will cause damage to the roller surface and grinding disc of the vertical mill

[0004] There are many kinds of mixed materials used in the preparation of cement, with different properties. Some mixed materials have a large metal content. These metals have poor grindability and high hardness, and are difficult to grind, and they are more harmful to wear-resistant parts such as grinding rollers and grinding discs of vertical mills. Large, greatly reducing the service life of the vertical mill wear parts; Difficult-to-grind metals will intensify the vibration of the vertical mill after entering the vertical mill, and in severe cases will cause vertical mill vibration stop, wear parts cracking and deformation, etc. In the large material, it is difficult to remove the iron remover at one time. After the large block is crushed and crushed, the internal metal of the large material can come out of the large block. It needs two or more times to remove the magnetic substance.

[0005] Furthermore, reducing the particle size of the material entering the tube mill plays an important role in increasing the output and reducing consumption of the vertical mill pre-grinding system. However, due to the characteristics of the vertical mill itself, there is still a considerable amount of material that has been crushed once by the vertical mill. Part of the large particles, if these particles enter the tube mill, it will seriously affect the grinding efficiency of the tube mill, which is not conducive to increasing production and reducing consumption

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