Second, after the production of ingredients adjustment calculation and operation ΣSiO 2 means that the content of SiO 2 of all feed ingredients ash outer stone, anthracite and dusts on the SiO 2 plus 0.4 - 0.5, no detailed calculation. 2) Effective CaO of limestone Example 2: 1) The variable limestone ratio of 1 kg per 100 kg of the mixture is equivalent to 0.40 kg of effective CaO;
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After the sintering machine is put into production, the conditions in all aspects are changing. In order to maintain a certain degree of sinter alkalinity, adjustments must be made continuously, but the reasons for fluctuations should be found during adjustment. Generally, the following aspects are:
1) Fluctuation of raw material components. Mainly because of the unstable composition of TFe, SiO 2 and CaO in the incoming components, segregation of the particles in the silo makes the composition unstable.
2) The operation is unstable. Especially in the shifting class, due to the inconsistency of the three shifts, the material layer and the machine speed are adjusted at any time, so that the loading amount, the amount of returning minerals and the composition also fluctuate, which affects the stability of the ingredients. In addition, for the volumetric ingredients, the control of the amount of the disc is not uniform, and the change of the amount of the material is caused by the change of the water and the particle size, which affects the stability of the production.
3) Defects in the equipment. The disc surface is inconsistent in processing and installation, and the material pressure is unstable, which will cause fluctuations in the amount of material to be fed.
4) Error in sampling. The representativeness of the sampling is not strong or the deviation of the test results causes misunderstanding of the batcher.
5) There is a certain error between the chemical composition selected in the batching calculation and the actual chemical composition.
In order to find out the exact reasons for the factors listed above, it is necessary to make a careful examination and analysis comparison:
1) The raw materials of the previous class and the class (focusing on changes in chemical composition);
2) The operation of the previous class, pay attention to research and check the fluctuation trend of TFe, SiO 2 and CaO of the sintered raw materials;
3) Check whether the ratio of ingredients is correct;
4) Check if the blanking amount is within the allowable fluctuation range;
5) Correctly analyze the test results of the sintered ore;
6) Whether the material conveying system is mixed, the quality of the returning mine is good or bad, and the material is added and reduced.
Through the above aspects of the inspection, the comprehensive analysis of the situation, to find out whether the quality fluctuations mainly in the concentrate or flux, is caused by the outside or inside, is equipment defects or operational errors. If it is true that the raw material composition fluctuates, then the ratio should be adjusted. The adjustment calculation is as follows:
1) First find the average of several components of the mixed ore and calculate the effective SiO 2 . 
Example 1:
1) Using the average of four mixed ores SiO 2 = 10.8%, CaO = 2.8%. R = 1.0
CaO effective = 43.8-2.8 × 1.0 = 41%
3) Gray stone ratio Mixing ore ratio of 70 kg, brought into SiO 2 effective = 70 × (1 - 8.1%) × 8.0% = 5.144 kg plus anthracite and dust SiO 2 = 0.5 kg [next]
If the sinter alkalinity fluctuates upward by 0.04, how to adjust the ratio. According to the experience of production, under the above production conditions, the ratio of limestone is ±1%, and the alkalinity is ±0.04.
It can be seen from the calculation that the fluctuation of the limestone ratio of 1% on the alkalinity depends on the effective CaO of the limestone, the ore-mining rate and the SiO 2 or above empirical data for reference only.
In actual depletion, attention should be paid to a situation in which it takes 1 hour from the ingredients to the finished product to be tested. Therefore, the adjustment of the ingredients should be adjusted according to the changes of the previous samples and the conditions they have mastered.
1) After the ingredients are adjusted, the test results should be adjusted back to the normal value. For example, the sinter alkalinity requirement is 1.1, the test result exceeds the standard, such as 1.19 to be adjusted, and the adjusted alkalinity to about 1.12, it is necessary to start paying attention to the callback to avoid low alkalinity waste.
2) The adjustment of the ingredients, especially when it is required to change the alkalinity, the impact of the returning mine should be calculated, so the quality and quantity of the returning mine should be clear.
3) Stable ratio and large increase withdrawal. In normal production, the ratio should be strictly controlled according to the ratio, and the ratio should be stable. When the warehouse is dumped, the materials with close composition should be used as much as possible. The particle size of the raw materials should be used together. When making adjustments, it is necessary to make small changes to facilitate the stability of production. Sometimes in order to quickly reverse the unfavorable situation, we also adopt a method of large-scale withdrawal, but we should strengthen contact with relevant posts.
Third, the general quality accident analysis
(1) The main reason for the low or high iron is due to: 1) the grade of iron-containing raw materials is unstable. When the grade becomes high, the Fe of the sintered ore rises and the SiO 2 decreases, and the CaO is normal. When the grade is low, the Fe of the sinter decreases, the SiO 2 rises, and the CaO is normal. 2) The amount of the iron-containing raw material is unstable. When the amount of the feed is large, the sinter Fe rises, and the SiO 2 slightly rises, and the CaO decreases. When the amount of material is small, the sinter Fe decreases, SiO 2 slightly lower, CaO rises; 3) the iron-containing raw material moisture fluctuation, which is equivalent to the change of the blanking amount, that is, the increase or decrease of the water is equivalent to the decrease or increase of the blanking amount; 4) The amount of flux used, increasing the amount of flux, Fe is reduced.
(2) The reason why the alkalinity is high or low is mainly due to: 1) the grade of the iron-containing material is high or low. When the grade is high, the iron of the sinter rises, the SiO 2 decreases, and the CaO is normal, so that the alkalinity rises. When the grade is low, the iron of the sinter decreases, the SiO 2 rises, the CaO is normal, and the alkalinity decreases; 2) the amount of the flux. When the amount of material is large, the ratio is high, SiO 2 is slightly lower, iron is lowered, CaO is increased, and alkalinity is increased. The amount of material to be discharged is equivalent to a low ratio, SiO 2 is slightly lower, Fe is increased, CaO is decreased, and alkalinity is decreased; 3) the influence of the amount of iron-containing raw material being discharged. When the amount of material is large, Fe rises, SiO 2 slightly rises, CaO decreases, and alkalinity decreases. When the amount of feed is small, Fe decreases, SiO 2 decreases slightly, CaO rises, alkalinity rises; 4) CaO level in the flux. The CaO high SiO 2 does not change much, causing the alkalinity to rise. CaO decreases, SiO 2 does not change much, causing a decrease in alkalinity; 5) When other materials are mixed in the flux, CaO is greatly reduced) The alkalinity is decreased; 6) When the flux moisture changes, it is equivalent to the ratio or the amount of material to be discharged. Variety.
According to the main reasons for analyzing the quality fluctuations, corresponding measures are taken to adjust.