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Method and device for recycling arsenic from high arsenic smoke

A technology for arsenic fume and recovery of arsenic, which is applied in the directions of combined devices, separation methods, chemical instruments and methods, etc., can solve the problems of high arsenic hazard, difficult separation, and can not achieve the separation of arsenic trioxide, etc., and achieves less impurity content and improved purity. , the effect of low environmental impact

Pending Publication Date: 2020-07-24
河南昌宜有色金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that, in view of the high hazard and difficult separation of arsenic, the arsenides and the compounds of lead and zinc that are too late to react in the general reduction roasting dearsenication process will volatilize with the flue gas, and cannot reach The purpose of completely separating arsenic trioxide from valuable metals is that high-purity arsenic trioxide cannot be obtained directly

Method used

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  • Method and device for recycling arsenic from high arsenic smoke
  • Method and device for recycling arsenic from high arsenic smoke
  • Method and device for recycling arsenic from high arsenic smoke

Examples

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Effect test

Embodiment 1

[0055] This embodiment provides a device for recovering arsenic from high-arsenic smoke and dust. figure 2 Shown: It includes a roasting furnace 3, a combustion furnace 5, a settling chamber 9, a dust collector 10, a spray tower 12, and an external chimney 13 which are connected in sequence; among them, the roasting furnace 3 includes a furnace and the material containing high arsenic smoke and dust is introduced into the furnace. In the continuous feeding device for internal roasting, a mixing bin 1 is arranged above the continuous feeding device.

[0056] The continuous feeding device includes a steel belt for conveying materials containing high arsenic smoke and dust, and a sealing cover located above the steel belt. The sealing cover is filled with protective gas. The mixing bin 1 includes a batching bin located at the upper part and a distributor located at the lower part Among them, the distributor is filled with protective gas, and the protective gas is nitrogen, which is ...

Embodiment 2

[0060] The main components of the high arsenic smoke and dust treated in this embodiment are calculated as mass percentage: As30.25%, Pb28.45, Cu3.02%, Zn4.21%, S4.23%, Sb1.46% and Fe26.35% , The phase XRD data such as image 3 Shown.

[0061] The method for recovering arsenic from high-arsenic fumes in this embodiment adopts the device in Example 1 for recovery and includes the following steps:

[0062] Mix 500kg of the above-mentioned smoke dust with 50kg of activated carbon powder (based on 10% of the smoke and dust mass, particle size ≤0.15mm), 2.5kg of limestone (based on the mass of smoke and dust 0.5%) in the mixing bin, then enter the distributor, and protect it with nitrogen. The distributor makes the material evenly distributed on the steel belt of the steel belt baking furnace. With the operation of the steel belt, the high-arsenic fume mixture material enters the well-sealed steel belt electric heating and evaporation furnace furnace, fills the furnace chamber with nit...

Embodiment 3

[0065] The main components of the high arsenic smoke and dust treated in this embodiment are as follows: As25.46%, Pb24.35%, Cu3.14%, Zn3.18%, S2.06%, Sb0.95% and Fe26.26 %.

[0066] The method for recovering arsenic from high-arsenic fumes in this embodiment adopts the device in Example 1 for recovery and includes the following steps:

[0067] Mix 500kg of the above-mentioned smoke dust with 60kg of biomass charcoal powder (calculated by the mass of smoke and dust, particle size ≤0.10mm), 1.5kg of lime (calculated by the mass of smoke and dust 0.3%) in the mixing bin, then enter the distributor and pass nitrogen Sealing and protecting the distributor makes the material evenly distributed on the steel belt of the steel belt baking furnace. With the running of the steel belt, the high-arsenic fume mixture material enters the well-sealed steel belt electric heating evaporating furnace hearth, fills the hearth with nitrogen, and maintains the pressure in the furnace at -0.6kPa. The s...

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Abstract

The invention discloses a method for recycling arsenic from high arsenic smoke. The method comprises the steps that the high arsenic smoke and a carbon reducing agent are mixed to obtain a high arsenic smoke mixed material, and the high arsenic smoke mixed material is roasted in an inert atmosphere or a reducing atmosphere to obtain arsenious tail gas and high-lead ash residue; the arsenious tailgas is introduced into a combustion furnace, an activating agent is injected into the combustion furnace through a pulse powder injection valve for combustion, and high-temperature flue gas is obtained; and the high-temperature flue gas is condensed to obtain arsenic trioxide. A device for recycling arsenic from high arsenic smoke comprises a roasting furnace, the combustion furnace, a settling chamber, a dust remover, a spray tower and an externally-discharging chimney which sequentially communicate with one other; and the roasting furnace comprises a hearth and a continuous feeding device for guiding the high arsenic smoke into the hearth for roasting, and a material mixing cabin is arranged above the continuous feeding device. According to an arsenic removal technology, the arsenic removal selectivity and stability are good, the arsenic removal efficiency reaches up to 96.0% and above, and arsenic compounds obtained by purification reach 98.0% and above.

Description

Technical field [0001] The invention belongs to the technical field of comprehensive recycling and utilization of metallurgical solid waste, and in particular relates to a method and device for recovering arsenic from high-arsenic dust. Background technique [0002] The high arsenic fume mainly originates from the roasting and smelting process of copper, lead, zinc and other metallic minerals. Copper, lead, zinc and other metals are generally associated with arsenic, and arsenic cannot be completely removed during the beneficiation process. Therefore, a certain amount of arsenic will enter the smelting process with these metals and enter the smoke and smelting slag. There are various forms of arsenic in high-arsenic dust, mainly in the form of oxides, arsenates, arsenides and a small amount of arsenic sulfide. Every year in my country, a large amount of high-arsenic smoke and dust is hoarded and stored in the form of arsenic-containing tailings and tailings in the mining, proces...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B30/04C22B13/00C01G28/00B01D50/00
CPCC22B7/02C22B30/04C22B7/001C22B13/00C01G28/005B01D50/20Y02P10/20
Inventor 李立清王富源苏长青王朝
Owner 河南昌宜有色金属有限公司
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