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Copper extraction and iron removal method of copper ore acid leaching liquid

A technology of leachate and slag, applied in crucible furnaces, electric furnaces, rotary drum furnaces, etc., can solve the problems of consumption of large oxidants and neutralizers, high investment and production costs, and large loss of copper with slag, and achieves low environmental protection pressure. , The effect of comprehensive utilization is good, and the consumption of oxidant is small.

Active Publication Date: 2014-12-24
HENAN GONGXIN ENVIRONMENTAL PROTECTION & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional oxidation neutralization and iron removal and jarosite iron removal methods all need to consume a large amount of oxidants and neutralizers, the amount of slag is large and the loss of copper with the slag is large, the investment and production costs are high, and the slag Subsequent processing is difficult, and environmental protection pressure is relatively high

Method used

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  • Copper extraction and iron removal method of copper ore acid leaching liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: A method for extracting copper and removing iron from a copper ore acid leaching solution, comprising the following steps:

[0039] (1) Heap leaching: collect the low-grade secondary copper oxide ore and secondary copper sulfide ore produced in the process of copper ore hydrometallurgy, break them into pieces of 10-30mm in size, and then press the secondary copper oxide ore and copper sulfide ore in a ratio of 0.2~5:1 (according to the ratio of copper, iron and sulfur), transported to the storage yard for wet heap leaching; use dilute sulfuric acid as leaching agent for spraying Leaching to obtain a weakly acidic leaching solution containing 0.2-10g / L copper, 0.5-30g / L iron, and pH 1-3; send the obtained leaching solution to the copper extraction process;

[0040] (2) Copper extraction process: Extract copper from the leaching solution to obtain a copper-enriched solution containing 30-60g / L copper and less than 500mg / L iron, and obtain a copper-deficient s...

Embodiment 2

[0045] Example 2: The method for extracting copper and removing iron of copper ore acid leaching solution, operation is the same as example 1, and difference is:

[0046] (1) Heap leaching: Mix evenly according to the ratio of 0.2~1 of secondary oxide copper ore and copper sulfide ore, transport to the storage yard for wet heap leaching; use dilute sulfuric acid as leaching agent to spray and leaching to obtain 0.2~3g of copper / L, iron 0.5~10g / L, pH1~3 weakly acidic leaching solution; the obtained leaching solution is sent to the copper extraction process;

[0047] (2) Copper extraction process: copper is extracted from the leaching solution to obtain a copper enriched solution containing 30-60g / L copper and less than 500mg / L iron; the copper-poor solution after extraction contains Cu0.5g / L, Fe 2+ 14.3g / L, Fe 3+ 1.1g / L, pH1.2, the copper-poor solution is sent to the iron removal process;

[0048] (3) Iron removal process: preheat the copper-poor liquid to 90-98°C with ste...

Embodiment 3

[0050] Example 3: The method for extracting copper and removing iron of copper ore acid leaching solution, operation is the same as example 1, and difference is:

[0051] (1) Heap leaching: Mix evenly according to the ratio of 3~5:1 of secondary oxide copper ore and copper sulfide ore, transport to the storage yard for wet heap leaching; use dilute sulfuric acid as leaching agent to spray and leaching to obtain copper-containing 5 ~10g / L, iron 10~30g / L, pH 1~3 weakly acidic leachate;

[0052] (2) Copper extraction process: The leaching solution obtained by heap leaching is subjected to ion exchange adsorption through resin to obtain a copper-enriched solution containing 30-60 g / L of copper and less than 500 mg / L of iron; the obtained copper-poor solution contains Cu1. 2g / L, Fe 2+ 23.7g / L, Fe 3+ 0.8g / L, pH3.0, the copper-poor solution is sent to the iron removal process;

[0053] The copper-poor liquid is sent to the storage yard for leaching after being oxidized with an a...

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Abstract

The invention discloses a copper extraction and iron removal method of copper ore acid leaching liquid. The method comprises the following steps: breaking secondary copper oxide ore and secondary copper sulfate ore, mixing and performing wet-process dump leaching; using dilute sulphuric acid as a leaching agent for conducting spraying and leaching to obtain faintly acid leaching liquid; extracting copper from the leaching liquid through extraction or ion exchange to obtain copper-rich liquid and copper-deficient liquid; electrodepositing the copper-rich liquid to obtain cathode copper; performing high-temperature high-pressure continuous iron removal on the copper-deficient liquid in an oxidizing atmosphere to obtain ore pulp, filtering to obtain hematite slag, acidifying and oxidizing part of the copper-deficient liquid, and feeding to a stock dump for cyclic leaching. According to the method, iron ions and the copper sulfate ore are subjected to oxidative reduction in the dump leaching process; iron ions in the dump leaching liquid mainly exist in the form of divalent iron ions, so that the step of reducing divalent iron ions is removed for subsequent copper extraction; iron is removed by a high-temperature high-pressure process, so that the slag yield is low, the environmental protection pressure is small, and the iron slag can be reutilized; sulfuric acid generated in the iron removal process does not need to be neutralized and directly returns to the stock dump for cyclic leaching, so that the comprehensive utilization effect is good.

Description

technical field [0001] The invention relates to a treatment method for copper ore acid leaching liquid in a wet copper smelting process, in particular to a method for extracting copper and removing iron from copper ore acid leaching liquid. Background technique [0002] Low-grade refractory secondary copper oxide ores and secondary sulfide ores are leached out of copper by heap leaching, column leaching, tank leaching and other leaching processes in the traditional wet copper smelting process, and the leaching solution is extracted and back-extracted to obtain The copper-rich solution is sent to the electrowinning process, and a large amount of iron and other impurities in the raffinate need to be treated before being discharged or reused up to the standard. Conventional oxidation neutralization and iron removal and jarosite iron removal methods all need to consume a large amount of oxidants and neutralizers, the amount of slag is large and the loss of copper with the slag i...

Claims

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Application Information

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IPC IPC(8): C22B15/00C22B3/08C22B3/44
Inventor 王向阳孙伟郭志文陈永丰田兴堂曹全红
Owner HENAN GONGXIN ENVIRONMENTAL PROTECTION & TECH CO LTD
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