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Roasting gas-based reduction arsenic removal method for arsenic-containing copper slag

A copper slag and roasting technology, which is applied in the preparation/purification of sulfur, can solve the problems of excessive arsenic content, achieve the effect of reducing economic benefits and preventing re-oxidation

Active Publication Date: 2020-09-11
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above analysis, the embodiment of the present invention aims to provide a method for air-based reduction and dearsenization of arsenic-containing copper slag roasting to solve the problem of excessive arsenic content in reduced iron products in the prior art

Method used

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  • Roasting gas-based reduction arsenic removal method for arsenic-containing copper slag

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Experimental program
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Effect test

Embodiment 1

[0074] The raw material used in this embodiment is arsenic-containing copper slag, and the slag sample is depleted copper slag obtained by grinding and flotation of flash smelting slag. Its main chemical composition and mass percentage are: TFe 41.03%, SiO 2 33.00%, As 0.30%, Pb0.88%, Zn 2.28%, Cu 0.35%, the content of arsenate is 0.069%, the content of arsenic sulfide is 0.165%, and the content of arsenic oxide is 0.066%.

[0075] Grind arsenic-containing copper slag, select 50g of slag powder with a particle size of 75-100μm, and pre-dry the slag powder at 100-105°C for 3 hours to ensure that most of the free water in the slag powder is removed. The slag powder is placed in a desiccator and cooled to room temperature for later use.

[0076] Put the dried slag sample into the furnace and start to feed argon gas, set the flow rate of argon gas to 3L / min, raise the temperature to 700°C with the furnace, keep it warm for 30min, after the time is up, take a sample of the slag sa...

Embodiment 2

[0079] The raw material of this embodiment adopts arsenic-containing copper slag, and the slag sample is depleted copper slag obtained by grinding and flotation of flash smelting slag. Its main chemical composition and mass percentage are: TFe 41.03%, As 0.30%, wherein The content of arsenate is 0.069%, the content of arsenic sulfide is 0.165%, the content of arsenic oxide is 0.066%,

[0080] Grind the arsenic-containing copper slag, select 50g of 75-100μm slag powder, and dry it at 100-105°C for 3 hours in advance to ensure that most of the free water is removed, and place it in a desiccator to cool to room temperature for later use. Put the dried slag sample into the furnace and start to feed argon gas, set the flow rate of argon gas to 3L / min, heat up to 900°C with the furnace, keep it warm for 90min, after the time is up, take a sample to test the slag sample for arsenic sulfide and arsenic oxide and recovered products The content of metal in the medium; then start to pass...

Embodiment 3

[0083] The raw material used in this example is arsenic-containing copper slag, and the slag sample is depleted copper slag obtained by grinding and flotation of flash smelting slag. Its main chemical composition and mass percentage are: TFe 41.03%, As 0.30% , wherein the content of arsenate is 0.069%, the content of arsenic sulfide is 0.165%, and the content of arsenic oxide is 0.066%.

[0084] Grind the arsenic-containing copper slag, select 50g of 75-100μm slag powder, and dry it at 100-105°C for 3 hours in advance to ensure that most of the free water is removed, and then cool it to room temperature in a desiccator for later use. Put the dried slag sample into the furnace and start to feed argon gas, set the flow rate of argon gas to 3L / min, heat up to 1150°C with the furnace, and keep it warm for 120min. After the time is up, take samples to test the slag samples for arsenic sulfide and arsenic oxide and recovered products The content of metal in the medium; then start to...

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Abstract

The invention relates to a roasting gas-based reduction arsenic removal method for arsenic-containing copper slag, and belongs to the field of solid waste treatment and utilization in the non-ferrousmetallurgy industry. The problem that an arsenic content in a reduced iron product exceeds the standard in the prior art is solved. The roasting gas-based reduction arsenic removal method for the arsenic-containing copper slag comprises the following steps of 1, grinding the arsenic-containing copper slag, and drying slag powder to remove free water, and specifically, the arsenic-containing copperslag contains arsenic oxide, arsenic sulfide and arsenate; 2, carrying out high-temperature roasting on the slag powder, introducing inert gas in a high-temperature roasting process, carrying out high-temperature roasting decomposition on the arsenic oxide and the arsenic sulfide in the arsenic-containing copper slag, then volatilizing in a gas form, and forming arsenic roasting slag from non-volatile components; and 3, continuously introducing reducing gas into the arsenic roasting slag for 40-100 minutes at the reducing temperature of 650-1200 DEG C, and gasifying and removing the arsenatein the arsenic roasting slag to obtain arsenic-removed slag charge of the arsenic-containing copper slag. According to the roasting gas-based reduction arsenic removal method, the arsenic content in the slag can be obviously reduced, and raw material with the qualified arsenic content is provided for subsequent continuous treatment of the copper slag.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment and utilization in the non-ferrous metallurgy industry, in particular to an air-based reduction and dearsenization method for arsenic-containing copper slag roasting. Background technique [0002] 90% of my country's copper output is produced by pyrotechnics. The smelting process is accompanied by the production of a large number of high-arsenic-containing materials, mainly including slag, smoke, anode slime and electrolyte. In order to reduce the accumulation of arsenic in the copper smelting system, reduce or eliminate The impact of "arsenic damage" on the quality of smelting products or the smelting process, arsenic-containing fume, arsenic-containing electrolyte, arsenic-containing blister copper and arsenic-containing anode slime have been studied in depth, and arsenic-containing copper slag has been mainly used In recent years, with the rise of copper slag resource utilization re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/11C22B30/04C01B17/06
CPCC01B17/06C22B1/02C22B1/11C22B30/04
Inventor 万新宇齐渊洪王锋高建军严定鎏林万舟
Owner CENT IRON & STEEL RES INST
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