A comprehensive utilization method of blast furnace gas ash
A technology for blast furnace gas ash and ammonia water, which is applied in the field of comprehensive utilization of blast furnace gas ash, can solve the problems of polluting the environment, wasting resources, and the consumption of blast furnace gas ash cannot offset the output.
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Embodiment 1
[0074] according to figure 1 The flow chart shown in the figure deals with the blast furnace gas ash (derived from the blast furnace process inside the iron and steel enterprise):
[0075] Concentrate the coking waste ammonia water (from the coking process inside the iron and steel enterprise), and the NH in the obtained concentrated coking waste ammonia water 3 ·H 2 The concentration of O is 2mol / L, and the concentrated coking waste ammonia water is mixed with blast furnace gas ash (in terms of mass content, blast furnace gas ash contains about 31.08% iron, about 16.28% carbon, and about 12.99% zinc, and the remaining ingredients are mainly Oxygen; NH in coking waste ammonia 3 ·H 2 The molar ratio of O to zinc oxide in blast furnace gas ash is 60:1), leached at 300r / min and 30°C for 120min, centrifuged after leaching to obtain leaching slag and leaching solution; the leaching solution was tested, the results showed that About 55% of zinc is extracted from blast furnace ga...
Embodiment 2
[0084] The coking waste ammonia water is concentrated, and the NH in the obtained concentrated coking waste ammonia water 3 ·H 2 The concentration of O is 6mol / L, and the concentrated coking waste ammonia water is mixed with blast furnace gas ash (in terms of mass content, the blast furnace gas ash contains about 31.08% of iron, about 16.28% of carbon, and about 12.99% of zinc, and the remaining ingredients are mainly Oxygen; NH in coking waste ammonia 3 ·H 2 The molar ratio of O to zinc oxide in the blast furnace gas ash is 60:1), leached for 140min at 400r / min and 50°C, and plate and frame press filter after the leaching, to obtain leaching slag and leaching solution; the leaching solution was detected, The results showed that about 71% of the zinc was extracted from the blast furnace gas ash;
[0085] The leached slag is dried and sintered as a sintering raw material to obtain sintered ore (used as a raw material for a blast furnace) and sintering flue gas, and the sinte...
Embodiment 3～6
[0089] The content of this embodiment is basically the same as that of Example 2, except that the first additive is added to the concentrated coking waste ammonia water and then mixed with blast furnace gas ash for leaching; the type and amount of the first additive and the leaching rate of zinc are as follows: Table 1 shows.
[0090] The type, amount and zinc leaching rate of the first additive added to concentrated coking waste ammonia water in Table 1 Examples 3-6
[0091]
[0092] It can be seen from Table 1 that the first additive is added to the concentrated coking waste ammonia water and then mixed with blast furnace gas ash for leaching. The first additive is conducive to improving the complexing ability of the concentrated coking waste ammonia water and increasing the leaching rate of zinc.
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