Method for separating ferrum, copper and silicon components from copper smelting residues

A copper smelting slag and separation technology, applied in the field of metallurgical production, can solve the problems of low utility, limited direct application, and difficulty in acting on copper elements, etc., and achieve high comprehensive utilization of resources, high added value of products, and low processing costs Effect

Inactive Publication Date: 2010-11-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The larger the proportion of fayalite with weak magnetism, the separation of silicon by magnetic separation cannot be realized, which limits its direct application in ironmaking production, resulting in a great waste of iro

Method used

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  • Method for separating ferrum, copper and silicon components from copper smelting residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Grind the copper slag to below 1.0mm, weigh 40g and mix it evenly with sodium hydroxide according to the slag-alkali weight ratio of 1:0.37, place it in a muffle furnace and heat it to 550°C, keep the temperature constant for 3 hours, and wait until the temperature drops to Take it out at about 150°C and place it in hot water (400ml) for water immersion (2 hours), through precipitation and solid-liquid separation. After washing the filter cake twice, use dilute sulfuric acid to carry out acid leaching to extract copper (copper sulfate solution is obtained, the copper recovery rate is 85%); and then filtered, washed, and dried to obtain iron oxide products (iron recovery rate is 92%). Add acid to neutralize the filtrate by water immersion to adjust pH = 4.5. After precipitation and solid-liquid separation, the filter cake is washed twice, and the filter cake is dried to obtain finished white carbon black (silicon recovery rate reaches 92%); the filtrate is conc...

Embodiment 2

[0019] Example 2: Grind copper slag to below 0.6mm and weigh 40g, mix evenly with sodium hydroxide at a slag-to-alkaline weight ratio of 1:2.5, place in a muffle furnace and heat to 350°C, and react at a constant temperature for 2 hours. When it drops to about 150°C, take it out and put it in hot water (400ml) for water immersion (1 hour), through precipitation and solid-liquid separation; after the filter cake is washed twice, use dilute sulfuric acid to carry out acid leaching to extract copper (copper sulfate solution is obtained). , the copper recovery rate is 90%), and then filtered and dried to obtain iron oxide products, and the iron recovery rate is 95%. Add hydrochloric acid to the water leaching filtrate to neutralize and adjust pH = 3, separate the solid and liquid, wash the filter cake twice, and dry the filter cake to obtain the finished white carbon black (silicon recovery rate reaches 96%); the filtrate is concentrated to saturation to obtain chlorinated Sodium ...

Embodiment 3

[0020] Example 3: Weigh 40g of powdered copper slag, mix it evenly with potassium hydroxide at a slag-to-alkaline weight ratio of 1:0.6, place it in a muffle furnace and heat it to 500°C, keep the temperature constant for 3 hours, and wait until the temperature drops to about 200°C Take out and be placed in hot water (400ml) and carry out water immersion (2 hours), through precipitation, solid-liquid separation; After the filter cake is washed twice, acid leaching extracts copper with dilute sulfuric acid (copper sulfate solution is obtained, and the copper recovery rate is 88%), and then filtered and dried to obtain an iron oxide product iron recovery rate of 95%. Add hydrochloric acid to the filtrate to neutralize and adjust the pH value to 6. After solid-liquid separation, the filter cake is washed twice, and the filter cake is dried to obtain finished white carbon black (silicon recovery rate reaches 94%); the filtrate is concentrated to saturation to obtain potassium chlor...

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Abstract

The invention discloses a method for separating components, i.e. ferrum, copper, silicon, and the like, from copper smelting waste residues, which comprehensively recovers Si, Cu, Fe, and the like contained in the copper residues by using the copper smelting waste residues as raw materials and adopting thermal chemical reaction, water leaching and acid leaching or the conventional beneficiation technology so as to realize the resource recycling of the copper smelting waste residues. The method comprises the following steps of: mainly mixing alkali and the copper smelting waste residues according to a certain proportion to carry out heating reaction; selecting residue-alkali ratio, heating temperature and heat reaction time according to copper residue composition, and then firstly separating silicon dioxide entering a liquid phase in terms of sodium (potassium) silicate through the water leaching, filtering and washing; carrying out further acid (hydrochloric acid or sulfuric acid) adding treatment on a silicate solution so as to obtain a finished product of white carbon black through sedimentation, filtering and the drying of filter residues; concentrating filter liquor so as to obtain a saturated sodium (potassium) chloride/sodium (potassium) sulfate solution (recycled for recycling in an alkali industry); and further separating water leaching residues through acid leaching or the conventional beneficiation method so as to recover copper, ferrum, and the like.

Description

technical field [0001] The invention relates to the field of metallurgical production, in particular to a technical process for resource utilization of copper smelting slag. Background technique [0002] Copper smelting waste mainly comes from pyrometallurgy processes, such as reverberatory furnace smelting, flash furnace smelting, Noranda method, Isa method, electric furnace, etc. According to statistics, my country's annual output of copper slag is more than 8 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 SiO 2 (W SiO2 =22~40%), Cu(W Cu =0.5~5% and Fe(W Fe 22~63%). Moreover, the phases in copper slag are mainly fayalite, glass, iron oxide, copper matte (Cu 2 S-FeS solid solution) feldspar and a very small amount of metallic iron and metallic copper. The existing main treatment method is to stack these waste residues ...

Claims

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Application Information

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IPC IPC(8): C22B7/04
CPCY02P10/20
Inventor 陈茂生韩子荣陈锦
Owner KUNMING UNIV OF SCI & TECH
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