Comprehensive utilization method of zinc-containing dust mud of steel plant
A technology of iron and steel plant and dust sludge, which is applied in the field of comprehensive utilization of zinc-containing dust and sludge in iron and steel plants, to achieve high economic value, high feasibility, and high value realization
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[0037] Example 1
[0038] Take a sample of 50kg of zinc-containing dust ash from the No. 1 blast furnace of a steel plant. First, leaching with dilute hydrochloric acid solution. Add the zinc-containing dust ash and dilute hydrochloric acid solution to the anticorrosive ball mill for edge grinding and leaching, and then pump to the stirred leaching tank to continue leaching. The leaching end point is ph2.4. After the leaching is completed, the solid-liquid is separated. Obtain the leaching residue and the zinc, calcium and magnesium solution; after adding the zinc, calcium and magnesium solution to the milk of lime and stirring, the end point ph is controlled to 7, and the solid and liquid are separated to obtain zinc hydroxide and the calcium and magnesium solution; the calcium and magnesium solution is added to the milk of lime to control the pH Scope 9.5 After stirring, the solid-liquid is separated to obtain magnesium hydroxide and calcium-containing solution; after the calci...
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[0045] Example 2
[0046] Take a sample of 50kg of wet dust filter mud from a steelmaking converter in a steel plant. First, leaching with dilute hydrochloric acid solution, adding the dust-removing filter mud and dilute hydrochloric acid solution to the anticorrosive ball mill for edge grinding and leaching, and pumping to the stirred leaching tank to continue leaching. The leaching end point is ph2.2. After the leaching is completed, solid-liquid separation is obtained. The leaching residue and the solution containing zinc, calcium and magnesium; the solution containing zinc, calcium and magnesium is added to the milk of lime and stirred to control the end point ph at 7.5, and the solid-liquid separation is used to obtain zinc hydroxide and the solution containing calcium and magnesium; the solution containing calcium and magnesium is added to the milk of lime to control the pH range 10 After stirring, the solid and liquid are separated to obtain magnesium hydroxide and calcium...
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[0053] Example 3
[0054] Take a sample of 50kg of dust from a steelmaking electric furnace in a steel plant. Firstly, leaching with dilute hydrochloric acid solution. Add the dust-removing ash and dilute hydrochloric acid solution to the anticorrosive ball mill for edge grinding and leaching. Pump to the stirred leaching tank to continue leaching. The leaching end point is ph2.8. After the leaching is completed, solid-liquid separation is obtained to obtain leaching Slag and zinc-calcium-magnesium solution; after the zinc-containing calcium-magnesium solution is added to the milk of lime and stirred, the end point ph is controlled to be 7.2, and the solid-liquid separation obtains zinc hydroxide and the calcium-magnesium solution; the calcium-magnesium solution is added to the milk of lime to control the pH range of 10 After stirring, the solid and liquid are separated to obtain magnesium hydroxide and calcium-containing solution; after the calcium-containing solution detects it...
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