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Novel process for separating zinc and cobalt from nickel and cobalt slag from zinc smelting and purification

A nickel-cobalt slag and zinc smelting technology, applied in the field of comprehensive recycling of nickel-cobalt slag, can solve environmental pollution, no separation technology, large zinc powder and other problems, and achieve the effect of solving industry problems

Active Publication Date: 2012-07-04
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because cobalt, cadmium and other metals in nickel-cobalt slag are also easily dissolved by acid, therefore, pickling can only add a small amount of acid to leach a small part of the metal zinc in nickel-cobalt slag, recover a small part of the zinc, and pickle The slag is stockpiled or sold at a low price, and most of the sold part is purchased by small-scale zinc salt preparation enterprises. Due to the small scale and incomplete environmental protection facilities, serious pollution to the environment is caused when the nickel-cobalt slag is processed (in recent years, the cadmium pollution incident are closely related to this kind of slag transfer treatment, such as Hunan Xiangtan, Guangdong Shaoguan)
There is a patent for leaching valuable heavy metals in zinc hydrometallurgical purification waste slag by pressurized oxidative acid leaching (Chinese patent, application number 200810103261.0). The separation technology of zinc, cobalt and cadmium in the solution after leaching, cadmium is easily replaced by zinc powder from the leach solution, cobalt is not easy to be replaced by zinc powder, and a large amount of zinc powder is required. At the same time, this technology has no industrial application

Method used

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  • Novel process for separating zinc and cobalt from nickel and cobalt slag from zinc smelting and purification
  • Novel process for separating zinc and cobalt from nickel and cobalt slag from zinc smelting and purification
  • Novel process for separating zinc and cobalt from nickel and cobalt slag from zinc smelting and purification

Examples

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Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: see figure 1 A zinc-cobalt separation process for purifying nickel-cobalt slag produced by zinc smelting, the steps are:

[0022] (1) One-stage leaching: Slurry the nickel-cobalt slag with water and add it to the leaching tank. The leaching tank is equipped with a natural exhaust pipe, and then sulfuric acid is added. The initial concentration of sulfuric acid in the reaction solution is controlled at 120-130g / L. The solid ratio is 3 / 1, stirred, the heating temperature is 70-75°C, the reaction time is 110 minutes, and then filtered to obtain a section of leaching solution and a section of leaching residue;

[0023] (2) Second-stage leaching: Slurry the first-stage leaching residue with water and add it to the leaching tank. The leaching tank is equipped with a natural exhaust pipe, and then sulfuric acid is added. The initial concentration of sulfuric acid in the reaction solution is controlled at 195-200g / L. The liquid-solid ratio is 3 / 1, stirred, the heati...

Embodiment 2

[0034] Example 2: see figure 1 A zinc-cobalt separation process for purifying nickel-cobalt slag produced by zinc smelting, the steps are:

[0035] (1) One-stage leaching: Slurry the nickel-cobalt slag with water and add it to the leaching tank. The leaching tank is equipped with a natural exhaust pipe, and then sulfuric acid is added. The initial concentration of sulfuric acid in the reaction solution is controlled at 130-135g / L. The solid ratio is 4 / 1, stirred, the heating temperature is 75-80°C, the reaction time is 90 minutes, and then filtered to obtain a section of leaching solution and a section of leaching residue;

[0036] (2) Second-stage leaching: Slurry the first-stage leaching residue with water and add it to the leaching tank. The leaching tank is equipped with a natural exhaust pipe, and then sulfuric acid is added. The initial concentration of sulfuric acid in the reaction solution is controlled at 195-200g / L. The liquid-solid ratio is 4 / 1, stirring, the heati...

Embodiment 3

[0048] Embodiment 3: see figure 1 , step is the same as embodiment 2, but described activator is made up of following components by weight percentage: ZnO 33%, Na 2 o 2 32%, Na 2 SO 4 35%.

[0049] The inorganic coagulant consists of the following components by weight percentage: ZnCO 3 2Zn(OH) 2 ·H 2 O60%, NaOH 40%.

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Abstract

The invention relates to a process for separating zinc and cobalt from nickel and cobalt slag from zinc smelting and purification, which comprises: separating cobalt from lixivium of nickel and cobalt slag by using a cobalt activation inorganic flocculation method, enriching the cobalt, recovering cobalt, removing cadmium from the cobalt-free lixivium by using the conventional zinc replacement method, obtaining sponge metal cadmium, delivering the sponge metal cadmium to a zinc smelting copper and cadmium processing step to recover metal cadmium. After cobalt and cadmium are removed, the lixivium is returned to a leaching step in a main zinc smelting system for recovering zinc. Thus, metals such as zinc, cobalt, cadmium and the like are recovered from the nickel and cobalt slag; meanwhile, the environmental pollution influence of the long-term piled up slag and the risk of irregular transfer of heavy metal pollutants such as cadmium in the zinc industry are eliminated, the closed-circuit operation of the recycling of the slag is realized, discharge of waste water and gas is avoided, valuable metals are comprehensively recovered, the requirement on pollution-free production is met and the problem of the industry is solved.

Description

technical field [0001] The invention belongs to the field of comprehensive recovery and utilization of metal smelting, and in particular relates to a process technology for comprehensive recovery and utilization of nickel and cobalt slag produced in the purification process of zinc hydrometallurgy. Background technique [0002] The zinc hydrometallurgy process is roasting zinc concentrate, leaching zinc from the calcined sand, purifying and removing impurities from the zinc leaching solution, and electrowinning zinc from the zinc purification solution. The purification and impurity removal process of zinc leaching solution will produce a slag material containing zinc, cobalt, cadmium and other metals, commonly known as nickel-cobalt slag. [0003] At present, the wet zinc smelting enterprises only carry out simple pickling and selective leaching of the nickel and cobalt slag produced. Because cobalt, cadmium and other metals in nickel-cobalt slag are also easily dissolved b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/08C22B23/00C22B19/00
CPCY02P10/20
Inventor 何国才程亮马绍华马进郭昇贡大雷李玉胡双丽易超李俞良
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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