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Adsorbent based on waste steel slag and its preparation method and application
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A waste steel slag and adsorbent technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of high density of steel slag, fast settling speed, low removal rate of heavy metal ions, etc., and achieve easy preparation , low cost and good industrial prospects
Active Publication Date: 2020-12-08
LIAONING UNIVERSITY
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[0003] One of the objectives of the present invention is to provide a novel adsorbent prepared by making full use of discarded steel slag. The novel adsorbent is aimed at the problem of low removal rate of heavy metal ions in traditional sewage treatment. The steel slag is loose and porous, has a large specific surface area, and has a certain adsorption capacity. , and the density of steel slag is high, the sedimentation speed in water is fast, and it is easy to separate solid and liquid, so it can be used as an adsorption material to treat industrial wastewater Cr 6+ , has good industrial application prospects
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[0025] Take steel slag tailings, calcium lignosulfonate and glycerol, put the mixture in a mixer and mix evenly, add 25% water to mix, after mixing evenly, make 4~5mm steel slag particles.
[0026] The obtained steel slag particles are naturally matured for 48 hours, put into a muffle furnace and roasted at 500°C for 4 hours to obtain an adsorbent, that is, a new type of steel slag particles, which can be pickled with 10% HCl to remove Fe in the steel slag. , Mg and other metal ions.
[0027] Weigh 5g of steel slag particles in a 400mL beaker, then wei...
[0032] The sewage comes from the industrial production wastewater containing heavy metal ions in Taizihe ChromiumPlant, pH is 6.3, Cr 6+ The concentration is 142.17mg / L.
[0033] (2) The effect of the amount of adsorbent on the removal of metal ions Cr 6+ Impact
[0034] Method: Take 100ml of sewage, add respectively 0.30g, 0.35g, 0.40g, 0.45g, 0.50g, 0.55g, 0.60g of adsorbents based on waste steel slag prepared in Example 1, react for 1h, and then measure Cr in the solution 6+ content. The result is as figure 1 .
[0035] Depend on figure 1 The experimental results in 6+ The adsorption rate increases accordingly. When the amount of adsorbent based on waste steel slag is 5.0g, it has 6+ Better adsorption effect.
[0036] (3) The pH of wastewater affects the removal of metal ions Cr 6+ Impact
[0037] Method: Take 100ml of sewage, adjust the pH value to 1, 2, 3, 5, 7, 8, 9, 11, and 12 with dilute HCl and NaOH respectively, add 0.50 g of t...
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Abstract
The invention relates to an adsorbent based on waste steel slag and preparation method and application thereof, and belongs to the field of solid waste resource utilization. According the invention, during the steelmaking process, the oxidation product generated by impurities in pig iron is subjected to magnetic separation and screening to obtain steel slagtailings with the fineness less than 150meshes and an iron content less than 5%, then, 20% of aid grinding agent and 30% of surface active agent are added together for grinding, cleaning is carried out with 15% HCl to obtain a new adsorbent containing Cr6+waste water based on waste steel slag treatment. The waste steel slag is applied to the treatment of the heavy metal Cr6+waste water, the preparation is simple and convenient, the cost is low, and the removal efficiency can reach about 92%.
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