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A method for recovering nickel-chromium metal in metallurgical tailings

A technology for metallurgical tailings and recovery methods, which is applied in the improvement of process efficiency, grain processing and other directions to achieve the effects of improving processing capacity, saving energy, and improving recovery rate

Active Publication Date: 2018-12-25
CITIC HEAVY INDUSTRIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for recovering nickel-chromium metal in metallurgical tailings to solve the problem of recycling metal nickel and chromium in large-scale metallurgical tailings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: the present invention provides a kind of metallurgical tailings nickel-chromium metal recovery method, comprises the following steps:

[0023] Step 1: Send the metallurgical tailings containing nickel-chromium metal after dry or wet treatment into a semi-autogenous mill, and add water to the semi-autogenous mill to adjust the concentration of the material to 70% before grinding, until the grinding is completed After that, it is discharged from the semi-autogenous mill; because the unrecovered lumps and granular nickel-chromium metal objects contained in the metallurgical tailings are difficult to grind due to their hardness in dry or other wet processes, so the "grinding completed" mentioned therein It means that the materials that can be ground in the metallurgical tailings are ground to a particle size below 0.5mm;

[0024] Step 2: The material discharged from the semi-autogenous mill enters the screening machine. The screen aperture of the screening mac...

Embodiment 2

[0034] Embodiment 2: a kind of metallurgical tailings nickel-chromium metal recovery method comprises the following steps:

[0035] Step 1: Send the metallurgical tailings containing nickel-chromium metal after dry or wet treatment into the semi-autogenous mill, and add water to the semi-autogenous mill to adjust the concentration of the material to 75% before grinding, and the grinding is completed After that, it is discharged from the semi-autogenous mill; because the unrecovered lumps and granular nickel-chromium metal objects contained in the metallurgical tailings are difficult to grind due to their hardness in dry or other wet processes, so the "grinding completed" mentioned therein It means that the materials that can be ground in the metallurgical tailings are ground to a particle size below 0.5mm;

[0036] Step 2: The material discharged from the semi-autogenous mill enters the screening machine. The screen aperture of the screening machine is 8mm × 8mm. After screeni...

Embodiment 3

[0046] Embodiment 3: a kind of metallurgical tailings nickel-chromium metal recovery method, comprises the following steps:

[0047] Step 1: Send the metallurgical tailings containing nickel-chromium metal after dry or wet treatment into the semi-autogenous mill, and add water to the semi-autogenous mill to adjust the concentration of the material to 72% before grinding, and the grinding is completed After that, it is discharged from the semi-autogenous mill; because the unrecovered lumps and granular nickel-chromium metal objects contained in the metallurgical tailings are difficult to grind due to their hardness in dry or other wet processes, so the "grinding completed" mentioned therein It means that the materials that can be ground in the metallurgical tailings are ground to a particle size below 0.5mm;

[0048] Step 2: The material discharged from the semi-autogenous mill enters the screening machine. The screen aperture of the screening machine is 8mm × 8mm. After screen...

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PUM

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Abstract

The invention discloses a recovering method for nickel-chromium metal in metallurgical tailings. The recovering method comprises the following steps: grinding the metallurgical tailings which are treated by a dry method or a wet method and contain nickel-chromium metal by a semi-autogenous mill; screening the ground metallurgical tailings by a screening machine; grading the screened metallurgical tailings by a screw conveyor, then enabling small particulates to enter a magnetic separation system for separating, and enabling large particulates to enter a ball mill for further grinding; after the grinding is finished, stripping slag from metal, then enabling a mixture of the metal and the slag serving as purified materials to sequentially enter a purifying machine (the formula is shown in the description) for carrying out segmented purification, and recovering metal; enabling purified impurities to enter the magnetic separation system for separating; concentrating, dehydrating and drying slag slurry subjected to magnetic separation, namely finishing a recovering operation. According to the method, the recovery rate of the nickel-chromium metal can be effectively improved, and the problem of the recovery of the nickel-chromium metal in large-scale metallurgical tailings is solved.

Description

technical field [0001] The invention relates to the field of comprehensive treatment of industrial solid waste, in particular to a method for recovering nickel-chromium metal from metallurgical tailings. Background technique [0002] Nickel-chromium slag and stainless steel slag generally contain about 6%-12% metal substances. At present, the treatment is mostly limited to the crushing of hot slag after slow cooling or the recovery of massive or granular metals from the raw slag after the hot slag is sprayed and digested. A large amount of tailings with low metal content after recovery are disposed of by discarding or stockpiling. G in part of tailings r The compound can dissolve out strong toxicity G during long-term storage r 6+ , endangering the environment and human safety. At the same time, the loss of nickel and chromium precious metals in the tailings will cause economic losses. [0003] The amount of metallurgical nickel-chromium tailings is large, the metal con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C21/00B02C23/14B02C23/00C22B7/04C22B23/00C22B34/32
CPCB02C21/00B02C23/00B02C23/14B02C2201/06C22B7/005C22B7/04C22B23/00C22B34/32Y02P10/20
Inventor 李葆生李泽理闫昊天
Owner CITIC HEAVY INDUSTRIES CO LTD