Heavy metal waste slag treatment method and sulfur building material prepared thereby
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A treatment method and technology for heavy metals, applied in the field of environmental engineering, to reduce environmental damage, facilitate harmless treatment, and increase utilization value
Active Publication Date: 2010-11-17
CENT SOUTH UNIV
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[0003] At present, there is no method that can not only deal with heavy metal waste residues, but also generate building materials.
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Embodiment 1
[0026] Step 1. Retrieve the slag of the polluted acid system produced by a smelter, including heavy metal waste slag and gypsum slag. The specific operation is as follows: the flue gas generated in the roasting section of the lead-zinc smelter is sent to the acid production section through pipelines, and the flue gas Part of the soot that has not been cleaned in the dust collection stage will form dirty acid after washing with water, and the dirty acid will form heavy metal waste residue after sulfide precipitation, and the supernatant will be neutralized and precipitated to obtain gypsum slag, the main component of which is CaSO 4 2H 2 O.
[0027] The leaching toxicity test of heavy metal waste slag and gypsum slag was done, and the results are shown in Table 1.
[0028] Table 1 The leaching toxicity of heavy metal waste slag and gypsum slag
[0029] Unit: mg / L (-- means not detected)
[0030]
[0031] It can be seen from Table 1 that most of the heavy metals in the hea...
Embodiment 2
[0041] Step 1, according to the method of step 2 in Example 1, soak 100 g of heavy metal waste slag with 400 ml of 1mol / L sodium sulfide solution, and stir for 24 hours by mechanical stirring, filter out the slag sample, and place the gypsum slag in an oven to dry at the same time. Grind finely and pass through a 100-mesh sieve.
[0042] Step 2: Weigh 27.5g of heavy metal waste slag, 12.5g of sulfur, and 10g of gypsum slag after the pre-sulfurization treatment, mix them evenly, place the mixture in a mold, and heat it in a heating furnace within the range of 140-150°C, constantly stirring Rod stirring, during the heating process, the sulfur gradually melts and the slag sample forms a sticky shape. After 20-40 minutes, the mold is taken out of the heating furnace, compacted with a compacting rod, cooled, and demoulded to obtain sulfur building materials.
[0043] Step 3: Do a compression test on the sulfur building material, and the strength can reach 21.9Mpa. The building mat...
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Abstract
The invention discloses a heavy metal waste slag treatment method and a sulfur building material prepared thereby. The method comprises: soaking heavy metal waste slag in solution of sodium sulfide to pre-vulcanize excessive heavy metal ions in the waste slag into metal sulfides; drying the metal sulfides, grinding the metal sulfides and sieving the ground metal sulfides with a 100 mesh sieve; mixing the powder with sulfur uniformly, adding gypsum slag into the powder and the sulfur to obtain a mixture; filling the mixture in a mold, and placing the mold in a heating furnace to heat the mold at 140 to 150 DEG C with constant stirring till the sulfur melts and the heavy metal waste slag turns viscous; and taking the mold out 20 to 40 minutes later, compacting the mixture in the mold, cooling the mold and removing the mold to obtain the sulfur building material. The method can prevent the damages of freely discharged industrial waste slag with high heavy metal content to the environment by covering the heavy metal slag with sulfur to make the sulfur building material; and thus, the harmless treatment of industrial heavy metal waste slag is realized, the heavy metal waste slag is recycled and the utilization rate of the heavy metal waste slag is improved. The extraction procedure toxicity of the prepared sulfur building material is in complete accordance with the standards of Identification Standard for Hazardous Wastes-Identification for Extraction Procedure Toxicity (GB 5085.3-2007). The method can be used for high, medium and low content heavy metal waste slag.
Description
technical field [0001] The invention belongs to the field of environmental engineering, and in particular relates to a treatment method for heavy metal waste residue and sulfur building materials produced by the treatment method. Background technique [0002] The output of non-ferrous metals in my country ranks first in the world. However, with the rapid development of the non-ferrous industry, a large amount of heavy metal smelting waste is discharged into the environment, causing irreversible damage to the environment and seriously affecting human life. Heavy metals are persistent pollutants in the environment, with high toxicity and serious pollution. Heavy metals such as mercury, lead, zinc, cadmium, copper, chromium, and nickel will seriously endanger human health. [0003] At present, there is no method that can not only deal with heavy metal waste slag, but also generate building materials. The present invention mainly pre-vulcanizes the heavy metal waste slag into a...
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