Preparation method of formed coke used for smelting-reduction ironmaking
A technology of coke powder and fat coal, which is applied in the field of coke preparation, can solve problems such as waste, achieve high value, reduce costs, and reduce risks
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Embodiment 1
[0017] Such as figure 1 Shown, a method for preparing molded coke for smelting reduction ironmaking, comprising the following steps:
[0018] Step 1, select coke powder and fat coal whose particle size is less than 10mm, and the dry basis ash content of the fat coal is A d =8~10%, the dry base volatile matter VM of the fat coal d =15~25%;
[0019] Step 2: Mix coke powder and fat coal and pulverize to obtain a coke powder and fat coal mixture with a particle size of less than 1mm. In the mass percentage of the coke powder and fat coal mixture, coke powder accounts for 85-91%, and fat coal accounts for 9-15% , put the pulverized coke powder, fat and coal mixture into a drying oven to dry to control the moisture content below 2%;
[0020] Step 3: Add the binder to the mixture of coke powder, fat and coal for mixing and stirring. After stirring, it is observed that no local bonding occurs and the particle size distribution is uniform. Put the stirred material into the molding m...
Embodiment 2
[0025] A method for preparing molded coke for smelting reduction ironmaking, the difference between Example 2 and Example 1 is that the selected particle size is less than 10mm, A d =9%, VM d =20% fat coal and coke powder with a particle size of less than 10mm are configured to form a coke powder and fat coal mixture with a fat coal content of 12%. The coke powder and fat coal mixture is crushed with a pulverizer to a particle size of less than 1mm, and placed in a drying oven for drying Add 8% binder, the binder is a mixture of water glass: hydroxymethyl cellulose = 1:2, fully mix and stir, put it into the molding machine, and cold press it under 1.2MPa pressure to form a mold block. Put the block into a carbonization furnace and carbonize at 870°C for 50 minutes. After carbonization, take out the sample and cool it naturally in the air. The performance test results are as follows: TMS+10 is 25.42, TMS-2 is 17.20, RI is 32.15, and RSI is 41.25 Both meet the coal requirements...
Embodiment 3
[0027] A method for preparing molded coke for smelting reduction ironmaking, the difference between embodiment 3 and embodiment 1 is that the selected particle size is less than 10mm, A d =10%, VM d =20% fat coal and coke powder with a particle size of less than 10mm are configured to form a coke powder and fat coal mixture with a fat coal content of 15%. The coke powder and fat coal mixture is crushed with a pulverizer to a particle size of less than 1mm, and placed in a drying oven for drying Add 10% binder, the binder is a mixture of water glass: hydroxymethyl cellulose = 4:7, fully mix and stir, put it into the molding machine, and cold press it under 1.2MPa to form a mold block. Put the block into a carbonization furnace and carbonize at 900°C for 60 minutes. After carbonization, take out the sample and cool it naturally in the air. The performance test results are as follows: TMS+10 is 25.57, TMS-2 is 16.84, RI is 32.47, and RSI is 41.19 Both meet the coal requirements ...
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