Method for producing iron fine powder from sulfuric acid slag
A technology of sulfuric acid slag and iron fine powder, applied in the field of chemical treatment of sulfuric acid slag, can solve the problems of low iron grade, harmful element content, waste of iron resources, environmental pollution, etc., achieve high recovery rate, improve grade and recovery rate , the effect of improving the utilization rate
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Embodiment 1
[0038] Take a kind of sulfuric acid slag, and the mass fractions of various elements are as follows: 52.48% iron, 1.80% sulfur, 0.12% arsenic, 1.18% zinc, 0.66% lead, and 6.21% calcium. Then arbitrarily get 500g of sulfuric acid residue, add 2500g of hydrochloric acid with a mass fraction of 5%, control the temperature at 80 degrees and normal pressure, stir for 60min, filter to separate solid and liquid, obtain filter residue, add 1000g of water in filter residue, normal temperature and pressure Stir at low temperature for 5 minutes, filter to separate solid and liquid, and obtain water-washed slag, add 1000 g of sodium hydroxide with a mass fraction of 5% to the obtained water-washed slag, stir at normal temperature and pressure for 60 minutes, filter to separate solid-liquid, and obtain iron concentrate powder , Among them, the mass fraction of elements contained in iron concentrate powder is: iron 60.75%, sulfur 0.24%, arsenic 0.0035%, zinc 0.76%, lead 0.49%, calcium 1.37%....
Embodiment 2
[0040]Get the sulfuric acid residue 500g of embodiment one, add 1500g mass fraction and be 5% hydrochloric acid, temperature is controlled at 80 degrees and under normal pressure, stir 60min, filter and make solid-liquid separation, obtain filter residue, add 1000g water in filter residue, normal temperature Stir under normal pressure for 5 minutes, filter to separate solid and liquid, and obtain washed slag, add 1000 g of sodium hydroxide with a mass fraction of 5% to the obtained washed slag, stir at normal temperature and pressure for 60 minutes, filter to separate solid and liquid, and obtain iron Concentrated powder, wherein, the mass fraction of elements contained in iron fine powder is: iron 62.61%, sulfur 0.21%, arsenic 0.0038%, zinc 0.82%, lead 0.54%, calcium 0.46%. The iron recovery rate reached 88.84%.
Embodiment 3
[0042] Take the sulfuric acid slag, and the mass fractions of various elements contained in the test are: 48.24% iron, 3.26% sulfur, 0.24% arsenic, 1.62% zinc, 0.57% lead, and 5.77% calcium. Then arbitrarily get 500g of sulfuric acid residue, add 2000g of hydrochloric acid with a mass fraction of 6%, control the temperature at 50 degrees and normal pressure, stir for 90min, filter to separate the solid and liquid, obtain the filter residue, add 750g of water in the filter residue, and Stir at lower temperature for 4 minutes and filter for solid-liquid separation to obtain water-washed slag, add 1500 g of potassium hydroxide with a mass fraction of 20% to the obtained water-washed slag, stir for 90 minutes at normal temperature and pressure, filter to separate solid-liquid to obtain iron concentrate powder, The mass fraction of elements contained in the prepared iron concentrate powder is 58.46% iron, 0.28% sulfur, 0.0054% arsenic, 0.91% zinc, 0.45% lead, and 1.24% calcium. The...
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