Method for comprehensively recovering Fe, Cu and Si from copper smelting slag

A technology of copper smelting slag and copper slag, which is applied in the field of copper, separation of iron, and silicon dioxide, can solve the problems of low utility, low resource utilization rate, and difficult separation of existing technologies, and achieve resource integration The effect of high utilization rate, high product added value and short process flow

Inactive Publication Date: 2009-10-14
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0003] At present, the biggest difficulties are: copper, iron, and silicon inlaid in copper slag are extremely fine and evenly distributed, and various minerals are wrapped with each other, making the structure dense and hard, with stable chemical properties. The existing technology is difficult to separate, and the utilization rate of resources is low Low; copper slag mainly consists of iron silicate, magnetic iron oxide, fayalite (2FeO.SiO 2 ), magnetite (Fe 3 o 4 ) and some amorphous glass composed of gangue. The larger the proportion of weakly magnetic fayalite, the more difficult it is to reduce silicon by magnetic separation, which limits its direct application in ironmaking production. The surface of copper slag is similar to glass. It is difficult for the agent to act on the copper element wrapped in it, resulting in low effectiveness of the existing beneficiation method

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  • Method for comprehensively recovering Fe, Cu and Si from copper smelting slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Grind the copper slag to below 5mm and weigh 100g for use, prepare 600ml with industrial hydrochloric acid at 35wt%, put it in a 1000ml beaker, then place it on an adjustable electric furnace and heat it to 50°C, turn on the stirrer and adjust it to 60r / min, slowly add Copper slag (solid-to-liquid ratio is controlled at 6:1), and the final acid concentration of the reaction is controlled to be PH<4. After 15 hours of reaction, the filter cake is washed three times through a centrifugal filter (4000 rpm, 3 minutes), and the filter cake is dried to obtain Finished white carbon black (silicon recovery rate reaches 88%, and purity is 85%); 1.2 times of iron powder amount of copper ion concentration is added in the filtrate, and through 30 minutes of replacement reaction filtration recovery metallic copper (copper recovery rate reaches 76%); Add alkali (lime water) to the filtrate to adjust the pH value to 6-7, filter through a centrifugal filter after 10 minutes of precipita...

Embodiment 2

[0024] Grind the copper slag to below 0.6mm and weigh 100g for use, prepare 1000ml with industrial hydrochloric acid at 50Wt%, put it in a 2000ml beaker, then place it on an adjustable electric furnace and heat it to 85°C, turn on the stirrer and adjust it to 500r / min, slowly Add copper slag (solid-liquid ratio is controlled at 10:1), and after 30 minutes of reaction, control the final acid concentration of the reaction to PH≤2, age for 20 minutes, and wash the filter cake three times by centrifugation (2500rpm, 5 minutes), filter The cake is dried to obtain the finished white carbon black (silicon recovery rate reaches 89%, and the purity is 91%); alkali (lime water) is added to the filtrate to adjust the pH value to 67, and after 20 minutes of precipitation, it is filtered through a centrifugal filter, and then passed through Drying, crushing, and magnetic separation are used to obtain iron oxide finished products (iron recovery rate is 85%), and copper recovery rate is up to...

Embodiment 3

[0026] Grind the copper slag to below 0.6mm and weigh 100g for use, prepare 2000ml with industrial hydrochloric acid at 40Wt%, put it in a 2500ml beaker, then place it on an adjustable electric furnace and heat it to 95°C, turn on the stirrer and adjust it to 300r / min, slowly Add copper slag (solid-liquid ratio is controlled at 20:1), and after 60 minutes of reaction, control the final acid concentration of the reaction to PH<4, age for 20 minutes, pass through a centrifugal filter (2500rpm, 5 minutes) and wash the filter cake three times, The filter cake is dried to obtain the finished white carbon black (silicon recovery rate reaches 92%, and the purity is 93%); alkali (lime water) is added to the filtrate to adjust the pH value to 7-9, and after 20 minutes of precipitation, it is centrifuged and filtered. The cake is dried, crushed and separated by magnetic separation to obtain iron oxide finished product (the iron recovery rate is 87%), and the copper recovery rate reaches ...

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Abstract

The invention discloses a method for comprehensively recovering iron, copper and silicon dioxide from copper smelting slag. The method takes copper smelting slag as a raw material, and comprehensively recovers Fe, Cu and Si in copper slag by adopting wet chemistry metallurgical technology. A muriatic acid and an inorganic acid are mainly adopted for leaching the copper smelting slag, the leaching acid concentration, the solid to liquid ratio, the leaching temperature and the leaching time are selected according to the quality requirement of silicon dioxide products under certain conditions, and silicon dioxide is firstly separated through filtering and drying to prepare silica pigment; the leaching filtered liquid is counteracted, settled, filtered, dried and ground, and ferric oxide phase and copper-bearing phase are selectively separated by adopting a conventional mineral processing method.

Description

technical field [0001] The invention relates to a method for separating three components of iron, copper and silicon dioxide from copper smelting slag, in particular to a method for comprehensively recovering Fe, Cu and Si from copper smelting slag. It belongs to wet chemical metallurgy technology. Background technique [0002] Copper smelting slag mainly comes from fire-based smelting processes, such as reverberatory furnace smelting, flash furnace smelting, Noranda method, Esa method, etc. According to statistics, my country's annual output of copper slag is more than 1.5 million tons, and the current cumulative copper slag has exceeded 25 million tons. Due to different production processes, the chemical composition of copper slag also has certain differences. Copper slag contains a large amount of valuable metal elements, especially Cu (Wcu=0.35~4.6%) and Fe (WFe22~63%). Moreover, the phases in copper slag mainly include iron silicate, iron oxide, copper matte (Cu 2 S-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B3/10C22B3/06C01B33/12C01G49/06C01F11/24
CPCY02P10/20
Inventor 陈茂生
Owner KUNMING UNIV OF SCI & TECH
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