A kind of manufacturing method of hematite powder pellet
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A manufacturing method and technology of hematite powder, which is applied in the field of manufacturing hematite powder pellets, can solve the problems of increasing production costs, easy ring formation in rotary kilns, etc., and achieve the effect of reducing preheating temperature and roasting temperature
Active Publication Date: 2011-12-07
SHANXI TAIGANG STAINLESS STEEL CO LTD
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Problems solved by technology
This method can only improve the strength of the preheated pellets, but when roasting in the rotary kiln, the roasting temperature is still very high, and the rotary kiln is easy to form rings
In addition, because of the increase of the secondary combustion furnace, the production cost is also increased.
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Embodiment 1
[0028] In this example, hematite powder pellets were prepared by pretreatment with high-pressure roller mills.
[0029] The concrete steps of this embodiment are as follows:
[0030] (1) Iron carbonate ore powder grinding pretreatment:
[0031] Selected raw materials: Daixian iron carbonate ore powder, the burning loss is 31%, the content of particle size less than 0.074mm is 67%, and the moisture content of iron carbonate ore powder is 8.5%;
[0032] After the iron carbonate ore powder is dried in the drum dryer and reaches a suitable moisture content of 6.5%, it is sent to the moistening mill for pretreatment of moistening and grinding;
[0033] When leaving the mill, the proportion of iron carbonate powder smaller than 0.074mm increased from 67% to 73%;
[0034] (2) Ingredients:
[0035] The ferric carbonate powder, hematite powder and bentonite after the moistening pretreatment carry out batching according to following weight percentage:
[0036] Iron Carbonate Powder ...
Embodiment 2
[0049] In this example, hematite powder pellets were prepared by pretreatment with high-pressure roller mills.
[0050] The concrete steps of this embodiment are as follows:
[0051] (1) Iron carbonate ore powder grinding pretreatment:
[0052] Selected raw materials: Daixian iron carbonate ore powder, the burning loss is 31%, the content of particle size less than 0.074mm is 67%, and the moisture content of iron carbonate ore powder is 8.5%;
[0053] After the iron carbonate ore powder is filtered and reaches a suitable moisture content of 6.5%, it is sent to a moistening mill for pretreatment of moistening and grinding;
[0054] When leaving the mill, the proportion of iron carbonate powder smaller than 0.044mm increased from 67% to 75%;
[0055] (2) Ingredients:
[0056] The ferric carbonate powder, hematite powder and bentonite after the moistening pretreatment carry out batching according to following weight percentage:
[0057] Iron Carbonate Powder 9%
[0058] Hema...
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Abstract
The invention relates to a method for preparing hematite powder pellets. The method comprises the steps of proportioning, mixing, pelletizing and roasting, and is characterized in that: iron carbonate ore powder in weight ratio of 5-15 percent, which is subjected to damp-mill pretreatment, is added during proportioning of hematite powder and bentonite. The method comprises the following specific steps of: I, performing damp-mill pretreatment on the iron carbonate ore powder: filtering the iron carbonate ore powder with water content of not more than 8.5 percent or drying in a rotary drum dryer to keep the water content of the iron carbonate ore powder not more than 6.5 percent, and feeding the iron carbonate ore powder into a damp mill to perform the damp-mill pretreatment; II, proportioning: proportioning the iron carbonate ore powder, the hematite powder and the bentonite in the following percentage by weight: 5-15 percent of iron carbonate ore powder, 83.5-93 percent of hematite powder and 0.5-2 percent of bentonite; III, pelletizing: uniformly mixing the components, adding the components into a pan pelletizer and replenishing water for pelletizing to produce pellets; and IV, roasting: distributing and roasting on a chain grate machine-rotary kiln to obtain finished product pellets. The hematite powder pellets prepared by using the method disclosed by the invention has the advantages of low preheating combustion temperature and high strength.
Description
technical field [0001] The invention relates to a method for manufacturing hematite powder pellets. Background technique [0002] In recent years, with the development of my country's iron and steel industry, many new grate-rotary kiln production lines have been newly built. Compared with the traditional shaft furnace pellet production process, the quality of the pellets produced by the grate-rotary kiln process is better, which ensures the stable operation of the blast furnace to a certain extent. At present, there are mainly two kinds of iron ore powder used in the production of pellets, one is magnetite powder and the other is hematite powder. After the magnetite powder is pelletized, when the grate-rotary kiln process is used for roasting, the preheating roasting temperature is generally around 900-950°C. At this time, the strength of the pellets can reach the 400N / 个球团 For the above strength requirements, after the preheated ball enters the rotary kiln and is fired at...
Claims
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