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Method for selectively removing arsenic and recycling valuable metals from white smoke dust

A technology for recovery of valuable metals, applied in chemical instruments and methods, arsenic compounds, arsenic oxide/arsenic hydroxide/oxyacid arsenic, etc., can solve the problem of lack of perfect treatment process, low arsenic removal rate, and poor process versatility and other problems, to avoid long wet treatment process, high arsenic removal selectivity, and strong adaptability of raw materials

Inactive Publication Date: 2020-01-10
云南锡业研究院有限公司 +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing white soot resource treatment processes mainly include wet method, fire method, and fire-wet (wet-fire) method combined process. No perfect treatment process
For example, the water leaching arsenic removal process (a method for pre-removing arsenic from arsenic-containing soot disclosed in Chinese patent CN201610998354.9), uses one-stage hot water leaching and two-stage alkali leaching to remove arsenic. The two-stage arsenic removal rate can reach Up to 98%, can get a higher rate of arsenic removal, but there are problems of high cost of arsenic removal and large amount of wastewater treatment
Another example is the acid leaching arsenic removal process (Qin Yongning, arsenic-containing smoke wet extraction white smoke process, 2003, 6 (3): 37-40), this method uses 35g / LH 2 SO 4 Sulfuric acid solution, 8.5:1 liquid-solid ratio, leaching at 75°C for 60 minutes, yields arsenic trioxide, and the arsenic removal rate is 58.91%.
Fire (wet) method-wet (fire) method combined process (Liu Zhiming, analysis and suggestions on comprehensive recovery process of copper smelting fume and dust. China Nonferrous Metallurgy, 2015, 5: 44-48). Leach copper, zinc and arsenic, and then use the blast furnace to recover lead and bismuth. The disadvantage of this method is that the rate of wet arsenic removal is low, the circulation of arsenic in the system is large, the direct recovery rate of tin, lead and bismuth in the blast furnace process is low, and the valuable metals are dispersed. , indium cannot be recycled
In conclusion, among the current arsenic-containing material treatment processes, the wet process has a high recovery rate of valuable metals, but has the disadvantages of long process, large amount of wastewater treatment, and high cost. Although the pyroprocess is short and simple, it has disadvantages Dispersion of valence metals and low recovery rate

Method used

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  • Method for selectively removing arsenic and recycling valuable metals from white smoke dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) 500kg of arsenic-containing copper smelting smoke and dust, 75kg of additive sulfur and mix evenly, add 85L of sulfuric acid and stir in the acidification tank;

[0037] 2) Put the acidified material into 30cm×20cm×10cm iron pan and stack it on the material rack, put it into the muffle furnace flue gas hood and heat it up to 500°C for 3 hours, and discharge the material; the arsenic-containing smoke generated by roasting Collected by the dust collection system and sold as arsenic trioxide;

[0038]3) Add water to the roasted slag at a solid-to-liquid ratio of 1:6, leach in a stirring tank, adjust the leaching pH to ≤4 with sulfuric acid, control the leaching temperature at 80-95°C, and leaching for 3 hours. After the leaching is completed, plate and frame filtration;

[0039] 4) The filtrate is replaced with zinc powder to recover copper, the copper removal solution is concentrated to recover zinc sulfate, and valuable metals such as tin, lead and bismuth are recover...

Embodiment 2

[0042] 1) 500kg of arsenic-containing copper smelting smoke and dust, 230kg of additive pyrite and mixing, add 145L of sulfuric acid and stir in the acidification tank;

[0043] 2) Put the acidified materials into 30cm×20cm×10cm iron pans and stack them on the material rack, put them into the muffle furnace flue gas hood and heat up to 575°C for 5 hours, and discharge the materials; the arsenic-containing smoke generated by roasting Collected by the dust collection system and sold as arsenic trioxide;

[0044] 3) Add water to the roasted slag according to the solid-to-liquid ratio of 1:7, leaching in the stirring tank, and adjust the leaching pH to ≤5 with sulfuric acid, control the leaching temperature at 90-95°C, leaching for 4 hours, and filter the plate and frame after the leaching is completed;

[0045] 4) The filtrate is replaced with zinc powder to recover copper, the copper removal solution is concentrated to recover zinc sulfate, and valuable metals such as tin, lead ...

Embodiment 3

[0048] 1) Mix 500kg of arsenic-containing copper smelting dust, 45kg of additive charcoal powder, add 100L of sulfuric acid and stir in the acidification tank;

[0049] 2) Put the acidified materials into 30cm×20cm×10cm iron pans and stack them on the material rack, put them into the muffle furnace flue gas hood and heat up to 425°C for 4 hours, and discharge the materials; the arsenic-containing smoke generated by roasting Collected by the dust collection system and sold as arsenic trioxide;

[0050] 3) Add water to the roasted slag according to the solid-to-liquid ratio of 1:4, leaching in the stirring tank, and adjust the leaching pH to ≤6 with sulfuric acid, control the leaching temperature at 80-95°C, leaching for 4 hours, and filter the plate and frame after leaching;

[0051] 4) The filtrate is replaced with zinc powder to recover copper, the copper removal solution is concentrated to recover zinc sulfate, and valuable metals such as tin, lead and bismuth are recovered ...

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Abstract

The invention discloses a method for selectively removing arsenic and recycling valuable metals from white smoke dust. The method comprises the following steps: mixing and acidifying arsenic-containing white smoke dust generated by copper smelting, sulfuric acid and an additive in a ratio of white smoke dust to sulfuric acid to the additive being 1 to (0.1-1) to (0.01-0.5); roasting the mixed acidified materials for 1-6 hours at a temperature of 250-600 DEG C, violating and introducing arsenic in the white smoke dust into smoke dust in the form of arsenic trioxide, roasting and transforming valuable metals into sulfate or metal oxides or sulfide for slagging, and realizing separation of arsenic and valuable metals, thereby accomplishing arsenic removal; adding water into roasted slag for leaching in a solid-to-liquid ratio being 1 to (2-7), controlling the pH value of leach liquor to be smaller than or equal to 7 at a leaching temperature being 80-95 DEG C, stirring and leaching for 2-4 hours, and filtering; and recycling copper and zinc from filtrate, and recycling other metals from filter slags. The method disclosed by the invention is good in universality, is wide in raw material adaption, is good in value metal and arsenic separation effect, and is simple in value metal recycling process.

Description

technical field [0001] The invention relates to the technical field of resource utilization methods for white smoke and dust in the copper smelting industry. Background technique [0002] The white fumes produced in copper smelting production contain more valuable metals. Different raw materials and smelting processes result in large differences in the composition of white fumes such as arsenic, copper, tin, and lead. The current treatment methods for these arsenic-containing hazardous waste materials There are mainly harmless, resourceful and source reduction treatment. [0003] The existing white soot resource treatment processes mainly include wet method, fire method, and fire-wet (wet-fire) method combined process. There is no perfect treatment process. For example, the water leaching arsenic removal process (a method for pre-removing arsenic from arsenic-containing soot disclosed in Chinese patent CN201610998354.9), uses one-stage hot water leaching and two-stage alka...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B30/04C22B1/06C22B15/00C22B19/20C22B19/30C01G28/00C01G9/06
CPCC01G9/06C01G28/005C22B1/06C22B7/007C22B7/02C22B15/0071C22B19/22C22B19/30C22B30/04Y02P10/20
Inventor 季登会孙磊袁海滨黄迎红刘会讲蔡兵何宗航刘国辉
Owner 云南锡业研究院有限公司
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