Technological management of cement grinding system for roller press

Comparing with ball mill, roller press has obvious energy saving effect and is the advanced representative of grinding technology in 1980s. The technical advantages of roller press make it widely used in grinding of cement, raw meal, slag and so on. In our country, roller grinding system is used for grinding cement rapidly. 
The efficiency of roller mill cement grinding system is inseparable from scientific technology management. This paper introduces the experience of process technology management in cement grinding system of roller press (except final grinding) from the aspects of personnel training, material quality, measurement requirements, ball mill accessories, system ventilation, grinding temperature and operation of main equipment. 
1 conduct comprehensive training for operators. 
1) Operators should be familiar with the process flow and equipment specifications and performance, understand the working principle, learn the normal operation methods and have the general fault diagnosis ability and accident prevention knowledge and skills. 
2) Understand various rules and regulations, rules and regulations, rules and methods, clear job records, reporting system and responsibilities, grasp its spiritual essence, grasp the key points to strictly implement. 
3) Master the operation and control parameters of the system, understand the relationship between the parameters and the quality, output, safety, environmental protection. At the same time, it is necessary to know the relationship between the quantity of various materials and the current change of measuring instruments, which is the basis for the adjustment of Kanban operation. 
2 Effect of material quality on cement production and quality 
Understand and master the quality of clinker, mixtures and proportions, and gypsum quality on the impact of extrusion and grinding, while doing as much as possible to reduce the size of materials (grain size, temperature, moisture) work, especially pay attention to the temperature of clinker into grinding. The practice of direct grinding of hot clinker in the warehouse of Jingyang Plant and grinding of cool clinker in the yard proves that the output of the former should be reduced by 5.81%. At the same time, attention is paid to the construction performance of cement, so as to rationally formulate the quality control indicators of different cement varieties, and create conditions for systematic increase in production and consumption. 
3 requirements for metrology 
Before metering and debugging, the measuring instruments of the system are calibrated and calibrated in an all-round way. After the load is used, it is confirmed and recorded for the record. 
1) first requires adjustable stability, followed by the accuracy of absolute or relative values. 
2) Secondly, it is necessary to make all measuring instruments in the system can be compared with the relative value of accuracy, and then the absolute value allocation accounting. 
3) Record the current of each equipment when no-load running and under different loads, find out the relationship between load change and current value, the relationship between current value and various materials proportion (that is, the relationship with some quality indicators changes), as the judgment basis of Kanban management of technical personnel
4 complete the grate and weld the seam. 
The partition plate is the mill with its own components, its type and structure is mill manufacturer fixed, production enterprises according to the requirements of the mill installation on the line, so it is generally not very important. But for the mill, the influence of partition plate structure, type, distribution and width of grate slot and the filling rate of grate slot on the mill output and quality is very obvious. 
4.1 structure and type of partition board 
At present, the type and structure of partition board have been developed from the old double-deck partition board with full blind to the double-deck partition board with coarse and fine sieve board, without blind plate and screen mesh between the two-deck partition board, medium and high material level without blind board, and double-deck partition board with sieving device. In a word, the mill manufacturer designs partition boards of different forms and structures for mills equipped with different production processes. At the same time, many improvements have been made to the outlet sieve boards, which can be used with different process mills. 
4.2 complete the grate plate and weld the seam. 
When installing the grate plate, the gap between the grate plate should be uniform, the bolt should be soldered after several times, and at the same time, the gap gap of the grate plate should be soldered carefully to prevent the grate plate from moving in operation; if the area of the grate plate is too large, the grate joint should be welded and repaired to reduce the amount of the gap between the grate plate, so as to prevent the grinding body and material particles from stringing. Warehouse and control material flow rate. 
4.3 the size of the grate board, the area of the grate plate, and the residual sieve before and after the partition board. 
At present, the width of the double-layer grate is 6 mm to 8 mm, the width of the coarse sieve plate is 10 mm, and the width of the outlet grate plate is 4 mm to 6 mm. The grate plate material rate (%) of different grinding processes and the sieve residue (%, 0.08mm) of the baffle plate are shown in Table . 
If it is found that the sieve residual drop before and after the baffle plate is very small, it indicates that the grinding body gradation and the grinding body gradation are not suitable, and the ball diameter is small and the grinding body gradation is low, it is necessary to adjust the gradation and deal with the grate gap; the sieve residual drop of the baffle plate is reasonable or large, indicating that the grinding body gradation is appropriate, the grinding body gradation is appropriate, and the grinding system output is also similar. If the residual sieve drop appears inverted hanging phenomenon, the ball diameter may be larger or smaller, the grate discharge rate may be larger or smaller, according to the specific situation.