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Method for comprehensively recycling valuable metal from copper nickel slag

A valuable metal, copper-nickel slag technology, applied in the direction of improving process efficiency, can solve problems such as poor operation safety, difficult solid-liquid separation, and turning into hydrogels

Inactive Publication Date: 2014-05-21
斯莱登(北京)化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chlorination leaching method generally uses hypochlorite to generate chlorine gas, and then reacts the chlorine gas with copper-nickel slag to leach the valuable metals in the slag. This method produces chlorine gas that pollutes the environment and has poor operational safety, which is not conducive to large-scale safety. production; the direct acid leaching method is to directly add acid and water for a period of time according to a certain proportion, and then separate the solid from the liquid. Liquid separation is very difficult, and the silicon content in the filtrate is very high. When the concentration exceeds a certain level, the filtrate will become hydrogel and cannot be processed later.

Method used

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  • Method for comprehensively recycling valuable metal from copper nickel slag
  • Method for comprehensively recycling valuable metal from copper nickel slag

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Experimental program
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Effect test

Embodiment 1

[0063] The copper-nickel slag used in this embodiment mainly includes the following components Cu0.25wt%, Ni0.23wt%, Co0.08wt%, Fe40.7wt%, SiO 2 35wt%.

[0064] Step 1: adopt the closed-circuit grinding scheme, feed the copper-nickel slag through the vibrating feeder, and send it into the mill by the belt conveyor; after reaching the particle size requirement of 70-75%-80 mesh, it is lifted by the screw conveyor and bucket The machine is lifted to the powder silo for standby. Weigh the copper waste slag that has been ground in the powder silo and add it to the first-stage leaching tank. At the same time, add water and sulfuric acid in proportion. The amount of sulfuric acid added is 1.1 times the theoretical molar amount of iron in the copper-nickel slag. The mass percentage concentration of medium acid concentration is 80%, leaching for 30min at a temperature of 50°C; put the ore pulp leached in the first stage directly into the second-stage stirring leaching tank, and add w...

Embodiment 2

[0068] The copper-nickel slag used in this embodiment mainly includes the following components Cu0.30wt%, Ni0.25wt%, Co trace, Fe44wt%, SiO 2 40wt%.

[0069] Step 1: adopt the closed-circuit grinding scheme, feed the copper-nickel slag through the vibrating feeder, and send it into the mill by the belt conveyor; after reaching the particle size requirement of 70-75%-200 mesh, it is lifted by the screw conveyor and bucket The machine is lifted to the powder silo for standby. Weigh 100kg of the ground copper waste slag in the powder silo and add it to the first-stage leaching tank. At the same time, add water and hydrochloric acid in proportion. The amount of hydrochloric acid added is 0.9 times the theoretical molar amount of iron in the copper-nickel slag. The mass percentage concentration of acid in the pulp is 35%, and it is leached for 30 minutes at a temperature of 70°C; the pulp that has been leached in the first stage is directly poured into the second-stage stirring le...

Embodiment 3

[0073] The copper-nickel slag used in this embodiment mainly includes the following components Cu0.27wt%, Ni0.23wt%, Co0.09wt%, Fe45wt%, SiO 2 30wt%.

[0074] Step 1: adopt the closed-circuit grinding scheme, feed the copper-nickel slag through the vibrating feeder, and send it into the mill by the belt conveyor; after reaching the particle size requirement of 80-85%-325 mesh, it is lifted by the screw conveyor and bucket The machine is lifted to the powder silo for standby. Weigh 100kg of copper waste slag that has been ground in the powder silo and add it to the first-stage leaching tank. At the same time, add water and nitric acid in proportion. The amount of nitric acid added is 1.4 times the theoretical molar amount of iron in the copper-nickel slag. The mass percent concentration of acid in the pulp is 50%, and it is leached for 90 minutes at a temperature of 70°C; the pulp that has been leached in the first stage is directly poured into the second-stage stirring leachi...

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Abstract

The invention discloses a method for comprehensively recycling valuable metal from copper nickel slag. The method comprises the following steps: leaching iron out of raw material copper nickel slag by a step-by-step concentration difference leaching method, carrying out flotation enrichment on the leaching slag to prepare copper cobalt nickel bulk concentrate; selectively extracting iron from the leaching liquid by an extraction method to prepare iron oxide red, or precipitating the leaching liquid to prepare refined iron powder and water glass. By the method, high-grade copper cobalt nickel bulk concentrate, powdered iron, high-purity iron oxide red, high-modular water glass and other products are prepared with low cost. The method is environment-friendly and easy to operate and can realize continuous industrial production.

Description

technical field [0001] The invention relates to a comprehensive utilization method of copper-nickel slag, which belongs to the technical field of resource chemistry and environmental engineering. Background technique [0002] Copper-nickel slag is an industrial waste slag after copper extraction, and its main components include fayalite, magnetite, copper matte and valuable metals such as nickel and cobalt. China's copper output is more than 4 million tons, second only to Chile, ranking second in the world. The production of one ton of copper produces 212 tons of copper-nickel slag. At present, there are more than 10 million tons of copper-nickel slag in my country alone. A large amount of copper-nickel slag not only occupies a large area of ​​land, but also pollutes the environment. my country's copper ore resources are characterized by many associated ores and low grade. In this huge amount of copper-nickel slag, there are a large number of secondary resources that can be...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B15/00C22B23/00C03C6/10
CPCY02P10/20
Inventor 莫红兵段金城刘耀驰
Owner 斯莱登(北京)化工科技有限公司
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