Method for achieving stabilized solidification of high-concentration arsenic soda slag
An arsenic-alkali slag and stabilization technology is applied in the field of stabilization and solidification of arsenic-alkali slag and high-concentration arsenic-alkali slag. To achieve good removal effect, simplify steps, and promote the effect of precipitation
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Embodiment 1
[0031] Preparation of oxidant: After diluting to 2% with commercially available 30% hydrogen peroxide, it is uniformly mixed with sodium persulfate at a molar ratio of 2:1 to prepare an oxidant;
[0032] Stabilizer preparation: Mix ferrous sulfate heptahydrate and polyferric sulfate according to the mass ratio of 5:1 to form the stabilizer;
[0033] Conditioner preparation: mix 15% red mud, 78% kaolin or attapulgite, and 7% fly ash, and pass through a 100-mesh sieve to obtain conditioner powder; thermal activation treatment of the conditioner: roast the obtained conditioner powder, The calcination temperature is 630°C, the calcination time is 60min, and it can be used after cooling.
Embodiment 2
[0035] The medicament in Example 1 was used for arsenic-alkali slag treatment.
[0036] Take 500g of arsenic pollution concentration of 21520mg / kg arsenic-alkali slag, add 1.5% oxidant and stir for 10min, then add 15% stabilizer and stir for 10min, finally add 10% conditioner and stir for 10min, then maintain at room temperature for 5d, measure the arsenic leaching concentration . The water immersion concentration of arsenic dropped from 1950mg / L before treatment to 0.93mg / L after treatment. The water immersion concentration of arsenic in the treated arsenic-alkali slag is less than 2.5mg / L, which is lower than the control limit value for the hazardous waste allowed to enter the landfill area in the "Hazardous Waste Landfill Pollution Control Standard" (GB18598-2001).
Embodiment 3
[0038] The medicament in Example 1 was used for arsenic-alkali slag treatment.
[0039] Take 500g of arsenic-alkali slag with an arsenic pollution concentration of 30550mg / kg, add 2% oxidant and stir for 15 minutes, then add 20% stabilizer and stir for 15 minutes, finally add 12% conditioner and stir for 15 minutes, then maintain at room temperature for 7 days, and measure the concentration of arsenic leaching . The water immersion concentration of arsenic dropped from 2625mg / L before treatment to 1.53mg / L after treatment. The water immersion concentration of arsenic in the treated arsenic-alkali slag is less than 2.5mg / L, which is lower than the control limit value for the hazardous waste allowed to enter the landfill area in the "Hazardous Waste Landfill Pollution Control Standard" (GB18598-2001).
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