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Extraction of sulfur from flue gas desulfurization waste slag slurry with solvent method
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A technology of desulfurization waste residue and solvent method, which is applied in the direction of sulfur compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of large energy consumption, achieve low energy consumption, simple and easy method, and realize the effect of rational utilization
Inactive Publication Date: 2012-03-21
SHENYANG INST OF ENG +1
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Although this route can obtain sulfuric acid products, it consumes a lot of energy
Method used
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Embodiment 1
[0023] 1. Dissolve (or extract)
[0024] (1) Weigh 25 g of the above solid (or 62.5 g of a solid-liquid mixture with a solid content of 40%) and place it in a 500 ml three-necked flask. Then, add carbon disulfide 100ml (126g) in this three-neck flask.
[0025] (2) Place the three-necked flask in a constant temperature water bath with a water temperature of 35°C, insert a stirrer with a rubber stopper in the middle port of the three-necked flask, insert a thermometer with a rubber stopper in one port, and seal the other port with a rubber stopper.
[0026] (3) When the thermometer in the three-necked flask reads 35°C, start the stirring and start timing, the stirring speed is 200rpm, and after 30min, turn off the stirring.
[0027] 2. Filtration and crystallization
[0028] (1) While the dissolution process is in progress, install a filtration system consisting of a Buchner funnel, a vacuum pump, and a suction filter bottle, and spread filter paper into the bottom of the Buch...
Embodiment 2
[0035] 1. Dissolve (or extract)
[0036] (1) Weigh 25 g of the above solid (or 62.5 g of a solid-liquid mixture with a solid content of 40%) and place it in a 500 ml three-necked flask. Then, 186 ml (300 g) of tetrachlorethylene was added to the three-necked flask.
[0037] (2) Place the three-necked flask in a constant temperature water bath with a water temperature of 70°C, insert a stirrer with a rubber stopper in the middle of the three-necked flask, insert a thermometer with a rubber stopper in one port, and seal the other port with a rubber stopper.
[0038] (3) When the thermometer in the three-necked flask reads 70°C, start the stirring and start timing, the stirring speed is 300 rpm, and after 120 minutes, turn off the stirring.
[0039] 2. Filtration and crystallization
[0040] (1) While the dissolution process is in progress, install a filtration system consisting of a Buchner funnel, a vacuum pump, and a suction filter bottle, and spread filter paper into the bo...
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Abstract
A solvent method for extracting sulfur from waste residue or sludge through flue gas desulfurization relates to a method for extracting the sulfur from the waste residues or the waste sludge. The invention discloses two methods for extracting the sulfur from wastes. In the method, the high-quality sulfur is recycled from the waste residue or the waste sludge through the flue gas desulfurization and biological treatment; a solid-liquid mixture (or is dehydrated and dried to be a drysolid) is added to a solvent-carbon bisulfide (or tetracarp) according to the drysolid and the mass ratio of the solvent of 1:1-1:5; at the mixture temperature of 10 to 45 DEG C (the tetracarp temperature of 20 to 90 DEG C), the mixture is stirred and extracted for 5min to 3h; then the extracted solid-liquid mixture is filtered at a constant temperature; then after cooling crystallization or evaporation crystallization, a filter liquor is filtered to obtain solid sulfur; and then the solid sulfur is dried toobtain a sulfur product. The invention has the advantages that the method is simple and practical, and the solvent can be recycled; and under the condition of lower energy consumption, the sulfur product with higher purity can be obtained, so as to realize the reasonable utilization of the wastes.
Description
technical field [0001] The invention relates to a method for extracting sulfur from waste residue or waste pulp, in particular to a method for extracting sulfur from waste residue and waste pulp obtained after a series of treatments such as flue gas desulfurization and biological treatment by using a solvent. Background technique [0002] The solid and liquid mixtures after flue gas desulfurization and biological treatment are generally disposed of in a waste way, which wastes the high content of sulfur resources and pollutes the environment. Now, some people collect this part of the waste slurry, dehydrate, dry and then burn it to produce sulfuric acid. Although this route can obtain sulfuric acid product, it will consume a lot of energy. Based on this situation, the present invention adopts a new process route for obtaining high-quality sulfur products by means of low energy consumption, so as to solve the above-mentioned utilization problem of waste residue slurry. Con...
Claims
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