Preparation process of cold-pressed red mud pellets as well as product and application of cold-pressed red mud pellets
A preparation process and technology of red mud, which is applied in the field of smelting additives, can solve the problems of low compressive strength and high energy consumption of red mud pellets, and achieve the effects of reducing porosity, accelerating evaporation rate, and increasing the contact surface between particles
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Embodiment 1
[0055] A slag pressing agent, by weight, raw materials include 55.00% of red mud, 3.00% of mineral heating agent, 42.00% of dedusting ash. Among them, the red mud is Bayer process red mud, and the main components are Fe 2 o 3 32.66%, Al 2 o 3 20.30%, SiO 2 13.21%, Na 2 O 7.43% and CaO 2.01%; the water content in red mud is 24%. The dedusting ash is a blast furnace dedusting ash, and its main components are C 29.56%, T-Fe (total iron) 32.37%, Al 2 o 3 3.17%.
[0056] The specific preparation process of the above-mentioned slag pressing agent is as follows: figure 1 As shown, the details are as follows:
[0057] ① Prepare red mud and dust removal ash that meet the particle size requirements. The red mud is crushed and sieved. The red mud passes through a 3mm sieve, so that the red mud particles smaller than 2mm account for more than 90%, and the dust is passed through a 0.106mm sieve.
[0058] ② Evenly mix the red mud, mineral heating agent and dedusting ash in ...
Embodiment 2
[0063] A slagging agent, by weight, raw materials include 87.00% red mud, 6.00% mineral heating agent, 7.00% dedusting ash. Among them, the red mud is Bayer process red mud, and the main components are Fe 2 o 3 32.66%, Al 2 o 3 20.30%, SiO 2 13.21%, Na 2 O 7.43% and CaO 2.01%; the water content in red mud is 23%. The dedusting ash is a blast furnace dedusting ash whose main components are C 29.56%, T-Fe 32.37%, Al 2 o 3 3.17%; Mineral exothermic agent consisting of 50.00 CaO and 50.00% MgO.
[0064] The specific preparation process of the above-mentioned slag removing agent is as follows: figure 2 As shown, the details are as follows:
[0065] ① Prepare red mud and dust removal ash that meet the particle size requirements. The red mud is crushed and sieved. The red mud passes through a 3mm sieve, so that the red mud particles smaller than 2mm account for more than 90%, and the dust is passed through a 0.106mm sieve.
[0066] ② Evenly mix the red mud with the ma...
Embodiment 3
[0072] The difference between this embodiment and embodiment 1 is that the composition and proportion of raw materials and process parameters are different, and the rest are the same as embodiment 1, and the specific differences are set as follows:
[0073] The difference in the composition and ratio of the raw materials is as follows: the raw materials include 52.00% red mud, 2.00% mineral heating agent, and 46.00% dust removal ash; the mineral heating agent includes 40.00 CaO and 60.00% MgO.
[0074] The difference in process parameters is as follows: the curing time is 16 hours to reduce the water content to 6.9%; the porosity of the material entering in the pre-pressing and emptying step is 45%, and the porosity of the material in the minimum gap area between the two rolls is 17%; In the pressure treatment step, the maximum pressure between the pair of rollers is 900t, the maximum linear pressure ratio is 9t / cm, and the line speed is 0.6m / s.
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Abstract
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