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Method for reducing arsenic content in copper smelting soot leaching slag

A technology for copper smelting soot and leaching slag, which is applied to chemical instruments and methods, arsenic oxide/arsenic hydroxide/oxyacid arsenic, arsenic compounds, etc. It can solve the problems of low reaction rate, low leaching rate, and high arsenic grade , to achieve the effect of simple process flow, avoiding secondary pollution and reducing arsenic content

Active Publication Date: 2020-06-30
BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the soot in industrial production is mostly treated by acid leaching. During the process, most of the copper, zinc, etc. are leached into the solution, and less attention is paid to arsenic. The leaching of arsenic is not complete. The salt form remains in the leaching slag, and due to the low reaction rate, the arsenic grade in the slag is higher
This part of the arsenic is difficult to leach, and needs to be carried out under high acid conditions, and the leaching rate is not high
In order to increase the leaching rate of valuable metals in industrial production, high acid is often used for leaching, but it still cannot meet the requirements of high-efficiency leaching of arsenic, and it also brings certain problems to the subsequent solution treatment. Copper in the leaching solution is mostly replaced by iron powder, Recycled by electrowinning processes, arsenic is mainly removed in the form of iron arsenate, calcium arsenate, etc. Due to the high acidity of the leaching solution, zinc is mostly not recovered, and it is directly neutralized and sent to the wastewater treatment system for treatment
The leached slag is recovered by blast furnace reduction smelting to recover lead and bismuth or sent to the lead smelter for batching treatment, and there is a certain problem of arsenic secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The main components of copper smelting soot are: Cu 9.73%, As 8.15%, Zn 3.67%, Pb 23.64%, leaching at room temperature, liquid-solid ratio 4, pH = 2 for 1 hour, the leaching rates of copper, zinc and arsenic are respectively 94.11%, 96.63% and 52.01%, the leaching residue is subjected to two-stage leaching, the leaching liquid-solid ratio is 4:1, the initial pH=2, the reaction temperature is 85°C, slowly add sodium sulfite 1.5 times the theoretical amount, and simultaneously add sulfuric acid dropwise to control the process pH =1.5~2, the reaction time is 1h, after two stages of leaching, the leaching rates of copper, zinc and arsenic are 99.20%, 98.90% and 90.65% respectively.

Embodiment 2

[0017] The main components of copper smelting soot used in the test are: Cu 13.31%, Zn 2.44%, As 11%, Pb 19.88%. The leaching rate of copper, zinc and arsenic were 93.65%, 96.80% and 72.35% respectively under the conditions of 4:1 liquid-solid ratio, room temperature and dropwise addition of sulfuric acid to control the initial pH=2. After the slurry is filtered, the leaching residue is slurried for secondary closed leaching, the liquid-solid ratio is controlled at 4:1, the reaction temperature is 85°C, the initial pH of the slurry is adjusted to 2, and sulfur dioxide gas is slowly introduced. The gas consumption is 1.2 times the theoretical amount, and the reaction time is After 1 hour, after two stages of leaching, the leaching rates of copper, zinc and arsenic were 98.67%, 98.90% and 92.65% respectively.

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PUM

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Abstract

The invention discloses a method for reducing the arsenic content in copper smelting soot leaching slag, and belongs to the technical field of wet process metallurgy. Copper smelting soot is subjectedto weak acid leaching, the final pH value of a leaching solution is controlled to be 2 or below, the leaching slag is subjected to secondary reducing leaching at 50-115 DEG C, the initial pH value ofthe solution is controlled to be about 2, slow leading-in of sulfur dioxide or adding of sodium sulfite+sulfuric acid and the like is conducted, arsenate in the slag is leached out and enters the solution, the arsenic content in the slag is reduced, and copper, zinc, arsenic and the like are comprehensively recycled from the primary leaching solution. The method for reducing the arsenic content in the copper smelting soot leaching slag is provided, the system acid concentration can be effectively reduced, later solution treatment is facilitated, meanwhile, the arsenic content in the slag is reduced, and secondary pollution of the arsenic is avoided.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and relates to a method for reducing the arsenic content in copper smelting soot leaching slag, in particular to a method for reducing the arsenic content in copper smelting soot leaching slag by low-acid leaching, which can effectively reduce the output solution Acidity is convenient for subsequent solution treatment and recovery of valuable metals. Background technique [0002] Melting pool smelting is an important process of copper smelting, accounting for about 60% of my country's blister copper production capacity, mainly including bottom blowing, side blowing and top blowing processes. Melting pool smelting is to add air or industrial oxygen to the melt while adding fine sulfide concentrate to the melt, and carry out intensive smelting in a violently stirred molten pool. This method does not have high requirements for furnace materials and is suitable for processing various Low-gra...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B30/04C22B15/00C22B19/30C22B19/20C22B13/00C22B30/06C01G28/00
CPCC01G28/005C22B7/007C22B7/02C22B13/045C22B15/0071C22B19/22C22B19/30C22B30/04C22B30/06Y02P10/20
Inventor 王玉芳王海北刘三平周起帆郑朝振秦树辰
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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