Comprehensive utilization method of cyanidation tailings

A technology for cyaniding tailings and filter residues, which is applied in the field of metallurgy and can solve problems such as high energy consumption, incomplete treatment, and secondary waste residue pollution

Active Publication Date: 2014-09-17
SHAANXI LONGMEN IRON & STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the characteristics of cyanide tailings and the current situation of high energy consumption, incomplete treatment, and serious secondary waste pollution in existing treatment methods, a new process for comprehensive utilization of valuable components in molten salt treatment of cyanide tailings resources is proposed. The application of the new process will effectively solve the heavy pollution problem of cyanidation tailings widely existing in the existing gold smelting production, and will also provide relevant ideas and methods for the efficient recovery of valuable metals in waste residues in non-ferrous metallurgy processes

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Examples

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Embodiment 1

[0029] The molten salt system selected in this example is NaOH-NaCl-NaNO 3 , the molar ratio of each component in the molten salt system is 2:1:1, the molar ratio of Si and Na is 1:2, the cyanide tailings and molten salt are fully mixed and placed in a muffle furnace for roasting, the roasting temperature 700°C, calcination time 1h, water immersion, liquid-solid ratio 4:1, leaching time 20h, the leaching rate of SiO in cyanide tailings after liquid-solid separation reaches 84.5%.

[0030] Carry out conventional cyanide leaching to filter residue (leaching condition is liquid-solid ratio is 5:1, leaching time is 24h, the mass percentage concentration of cyanide (NaCN) is 0.5%), the recoveries of gold and silver are respectively 90.2% and 83.9% , and the TFe grade in the remaining slag reaches 50%, realizing the comprehensive recovery of valuable elements in the cyanide tailings.

Embodiment 2

[0032] Combined with the accompanying drawings, the molten salt system selected in this example is NaOH-NaF-NaNO 3 , the molar ratio of each component in the molten salt system is 2.2:1:1, the molar ratio of Si and Na is 1:5, the cyanide tailings and molten salt are fully mixed and placed in a muffle furnace for roasting, the roasting temperature 200°C, 4 hours after calcination, water immersion, liquid-solid ratio 6:1, leaching time 10 hours, SiO in cyanide tailings after liquid-solid separation 2 The leaching rate reaches 80.4%.

[0033] Carry out conventional cyanide leaching to filter residue, leaching condition is that liquid-solid ratio is 5:1, and leaching time is 24h, and the concentration of cyanide mass percentage is 0.5%, and the recoveries of gold and silver are respectively 81.7% and 79.4%, and TFe in the remaining slag The grade reaches 49%, which can basically realize the comprehensive recovery of valuable elements in cyanide tailings.

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Abstract

The invention relates to a comprehensive utilization method of cyanidation tailings. The method comprises the steps of roasting cyanidation tailings in which molten salt is added to obtain a roasted product, wherein the molten salt is a mixture of NaOH, NaCl and NaNO3 or a mixture of NaOH, NaF and NaNO3; carrying out water immersion on the roasted product, and then, carrying out solid-liquid separation to obtain filtrate and filter residues; respectively recovering valuable elements in the filtrate and the filter residues. According to the invention, SiO2 in the cyanidation tailings is converted into soluble silicate in a roasting way by taking the cyanidation tailings as raw materials and the molten salt as a medium, so that the comprehensive utilization of a Si element in the cyanidation tailings is realized; meanwhile, the Au and Ag packages are opened, and the valuable elements such as Fe, Au, Ag and the like are enriched; in addition, the comprehensive utilization of all the valuable elements in the cyanidation tailings can be realized through conventional cyanide leaching and iron selection methods.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a comprehensive utilization method of cyanidation tailings. Background technique [0002] There are many gold metallurgical enterprises in my country, and a large amount of cyanide tailings will be discharged during production. Statistics show that my country has become the world's largest gold producer for five consecutive years, and the output in 2011 exceeded 360 tons; however, the environmental pressure and water pollution incidents brought about are shocking, such as: roasting pretreatment - cyanide gold extraction process tailings output The amount of cyanide tailings is about 30,000 t / t Au. Based on the national gold production in 2011, the annual discharge of cyanide tailings has exceeded 10 million t. For a long time, due to technical and production cost reasons, a large amount of cyanide tailings have been discarded and piled up like mountains, which not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B1/02
CPCY02P10/20
Inventor 张朝晖刘佰龙鲁慧慧
Owner SHAANXI LONGMEN IRON & STEEL
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