Extraction method of valuable elements from acid mud produced in sulfuric acid production by copper smelting flue gas

A technology of valuable elements and extraction methods, applied in the direction of element selenium/tellurium, improvement of process efficiency, etc., can solve the problem of low recovery rate of selenium, and achieve good and efficient separation effects

Inactive Publication Date: 2014-01-22
HUNAN RES INST FOR NONFERROUS METALS
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  • Extraction method of valuable elements from acid mud produced in sulfuric acid production by copper smelting flue gas

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Embodiment 1

[0050] Dry the acid mud and crush it to 120 mesh. The main components in the acid mud are calculated as (%) by mass percentage: Pb37.40, Se40.74, As3.14, Hg2.25. Take by weighing lime powder 28.4g, 50% lime powder is added in the selenium acid mud of 50g above-mentioned composition, mix homogeneously, place in the muffle furnace after remaining lime content is covered on the mixture surface, control roasting temperature is 450°C, roasting time 8h, after reaching the reaction time, weigh after cooling, the mercury-removed slag weighs 82.2g, and its main components are (%) by weight: Se24.8, As1.85, Hg0.14. The volatilization rates of Se, Hg, and As are 0, 99%, and 2.95%, respectively.

[0051] Use concentrated sulfuric acid with a mass fraction of 98% to prepare 120mL of a sulfuric acid solution with a concentration of 300g / L, add 20g of roasted slag under the condition of a stirring speed of 90r / min to obtain a mixed solution, and keep the temperature at 80°C for 4 hours in a ...

Embodiment 2

[0055] Dry the acid mud and crush it to 160 mesh. The main components in the acid mud are calculated as (%) by mass percentage: Pb37.40, Se40.74, As3.14, Hg. Take by weighing lime powder 61g, add 50% lime powder in the selenium acid mud of 50g above-mentioned composition, mix well, place in the muffle furnace after remaining lime content is covered on the mixed material surface, control roasting temperature is 700 ℃, roasting time 10h, after reaching the reaction time and weighing after cooling, the mercury removal slag weighs 112.59g, and its main components are calculated as mass percentages (%): Se18.09, As1.36, Hg<0.02; Se, Hg , As volatilization rates were 0, 99%, 2.46%.

[0056] Use concentrated sulfuric acid with a mass fraction of 98% to prepare 200mL of a sulfuric acid solution with a concentration of 324g / L, add 20g of mercury removal slag at a stirring speed of 100r / min to obtain a mixed solution, and keep the temperature at 80°C for reaction in a water bath 6h, du...

Embodiment example 3

[0060] Dry the acid mud and crush it to 200 meshes. The main components in the acid mud are (%): Pb37.40, Se40.74, As3.14, Hg. Take by weighing lime powder 35g, add 60% lime powder in the selenium acid mud of 50g above-mentioned composition, mix well, place in the muffle furnace after remaining lime content is covered on the mixed material surface, control roasting temperature is 850 ℃, roasting time 12h, after reaching the reaction time and weighing after cooling, the mercury-removed slag weighed 82.4g, and its main components were calculated as mass percentages (%): Se24.7, A1.86, Hg0.013; Se, Hg , As volatilization rates were 0, 99%, 2.44%.

[0061] Use concentrated sulfuric acid with a mass fraction of 98% to prepare 120mL of a sulfuric acid solution with a concentration of 400g / L, add 20g of mercury removal slag at a stirring speed of 120r / min to obtain a mixed solution, and keep the temperature at 85°C for reaction in a water bath 5h, during the leaching process, add ni...

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Abstract

The invention discloses an extraction method of valuable elements from acid mud produced in sulfuric acid production by copper smelting flue gas. Selenium-containing acid mud is treated by a process combining a fire method and a wet method. The technology process includes temperature-control solid selenium reconstruction, oxidation leaching, and reduction to precipitate selenium. The extraction method has a reasonable technology design, and fully utilizes properties of elements and chemical compounds in specific conditions, and achieves efficient separation and recovery of Hg, Se, As, Pb and other elements in the selenium-containing acid mud. The extraction method has high economic benefit. No "three waste discharge" is existed in the process. The extraction method is an environmental-friendly treating method with high resource utilization rate and low energy consumption. The extraction method solves a problem of recovery difficulty of the mercury and the selenium from the acid mud, a problem of environment pollution by arsenic due to easy dispersion, and the like. The extraction method improves the comprehensive metal recovery rate, and reduces environment pollution. The extraction method is suitable for treatment of high-mercury high-selenium and high-lead materials, and is a new technology process. In addition, the method is suitable for treatment of other materials containing selenium, mercury and arsenic. The extraction method is environmental friendly and has industrialized application value.

Description

technical field [0001] The invention relates to a method for extracting valuable elements in acid mud produced by producing sulfuric acid from copper smelting flue gas, and belongs to the technical field of resource utilization. Background technique [0002] In the copper smelting process, most of the selenium in the pyrite raw material enters the flue gas scrubber in the form of selenium dioxide in the oxidation smelting process along with the sulfur dioxide flue gas. In the scrubber, SeO 2 H formed when dissolved in water 2 SeO 3 By SO 2 It is reduced to crude selenium and settles together with the dust to form selenium-containing mud. The production conditions and raw materials of each factory are different, and the composition and phase of the acid mud obtained are also different. Even if the production conditions are the same, the composition of the acid mud is also quite different at different time periods. [0003] The main components of selenium-containing mud pr...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/44C01B19/02
CPCY02P10/20
Inventor 陈海清谭令苏莎路文殊魏威
Owner HUNAN RES INST FOR NONFERROUS METALS
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