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Treatment method of gold tailings

A treatment method and technology of gold tailings, applied in the field of comprehensive utilization of solid waste resources, can solve problems such as difficulties in the comprehensive utilization of gold tailings, complex recycling process, etc., and achieve industrial application, good treatment effect, and high value-added utilization Effect

Pending Publication Date: 2021-07-13
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a treatment method for gold tailings, which effectively solves the difficult problems of complex gold tailings valuable metal recovery process and difficult comprehensive utilization of gold tailings

Method used

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  • Treatment method of gold tailings

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Effect test

Embodiment 1

[0060] The present embodiment provides a method for treating gold tailings, and the gold tailings to be treated are gold tailings in the Jiaolai area of ​​Shandong, and the components are shown in Table 1;

[0061] Table 1 Composition of gold tailings in Jiaolai area, Shandong, wt%

[0062] Tailings Field SiO 2

Al 2 O 3

CaO MgO Fe 2 O 3

TiO 2

K 2 O

Na 2 O

Au(g / t) Shandong Jiaolai 69.9 15.9 1.96 0.49 1.02 0.24 5.43 4.19 0.2～0.6

[0063] like figure 1 As shown, the specific processing method includes the following steps:

[0064] Step (1): with the gold tailings to be treated and the chlorinating agent CaCl 2 Mix evenly at a mass ratio of 10:1; add binder water to the mixed material, roll forming, control water content ≈ 20%, ball diameter 10±2mm, take the pellet and place it at 250 ℃ to dry for 2 hours; dry ball The moisture content of pellets is less than 0.5%, and the strength of dry pellets is 60-70...

Embodiment 2

[0073] The present embodiment provides a method for treating gold tailings, which differs from Embodiment 1 only in that steps (2) and (3) are different, as follows:

[0074] Step (2): the calcine and the waste limestone (the mass fraction of CaO in the waste limestone is 95%) are uniformly mixed at a mass ratio of 2:1, and the acidity coefficient of the mixture is 1.71; Steel coke; smelting at 1000-1600 °C to obtain high temperature flue gas and molten tailings;

[0075] Step (3): Utilize described molten tailings to prepare fiber cotton, specifically as follows:

[0076] The molten tailings flow out from the slag outlet, and are spun into fibers by a three-roll centrifuge. process to obtain slag wool board.

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Abstract

The invention relates to the field of comprehensive utilization of solid waste resources and particularly relates to a treatment method of gold tailings. The treatment method comprises the following steps: mixing the gold tailings to be treated with a chlorinating agent and a binder, rolling and forming, drying, and then chloridizing and roasting to obtain metal flue gas and roasted sand, wherein the chlorinating agent is selected from one or several of CaCl2, MgCl2, NaCl and KCl. The problem that pollutants contained in the gold tailings are complex and are difficultly treated is solved; the treatment method of the gold tailings is provided; the method can effectively recycle valuable metals (especially precious metals) in the gold tailings; the problem that the extracted tailings are difficultly used after the valuable components are separated and extracted is solved; high value-added utilization of the tailings is realized; and the method has a wide application prospect.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of solid waste resources, in particular to a method for treating gold tailings. Background technique [0002] Gold tailings are waste residues discharged from gold-bearing ore after extracting gold concentrate. Gold tailings are alkaline (pH>10) and have more SiO 2 , AlO 3 , while containing a certain amount of Fe 2 O 3 , Al 2 O 3 , MgO and a small amount of precious metals (such as Au, Ag), heavy metals (such as Cu, Pb, Zn). Gold production generally adopts the cyanidation gold extraction method, in which cyanide must be added, so a certain amount of cyanide remains in the gold tailings. At present, the vast majority of gold mining enterprises carry out stockpiling treatment of tailings, occupying a large amount of land, and the annual cost of 300-400 km 2 The rate increases, destroying large amounts of agricultural and forest land. Gold tailings recovery rates are generally l...

Claims

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Application Information

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IPC IPC(8): C22B1/08C22B7/00C22B7/02C21B13/00C22B11/02C22B26/10C03C13/06C03C10/06
CPCC03C10/0063C03C13/06C21B13/0006C21B13/0066C22B1/08C22B7/002C22B7/02C22B11/021C22B26/10Y02P10/20
Inventor 王习东陈为彬刘丽丽王昊
Owner PEKING UNIV
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