Clean utilization method of siderite reinforced iron-based cyanidation tailings

A technology for cyanide tailings and siderite, applied in the direction of iron oxide/iron hydroxide, iron oxide, process efficiency improvement, etc., can solve the problems of high treatment cost, occupying land, polluting the environment, etc., and reduce hazardous waste. The effect of output, reduced use, and increased economic benefits

Active Publication Date: 2021-05-25
NORTHEASTERN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Cyanide tailings are mostly discharged in the form of tailings stockpiles, and their long-term stockpiling not only occupies land but also pollutes the environment
[0003] Existing cyanide tailings treatment technologies, such as hydrogen peroxide oxidation method, biological method, inco method, cyanide reduction precipitation method, chlorine oxidation method and other cyanide reduction treatment technologies can only reduce the cyanide content to the storage standard , or expensive to process
At present, most of the cyanide tailings produced in the gold and other precious metal industries are still stored in the tailings pond, and a small part is reprocessed because it contains recyclable value elements. However, the transportation operation during the reprocessing process must strictly follow the national hazardous waste regulations. The transportation is carried out according to the standard, and there is a high risk

Method used

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  • Clean utilization method of siderite reinforced iron-based cyanidation tailings
  • Clean utilization method of siderite reinforced iron-based cyanidation tailings
  • Clean utilization method of siderite reinforced iron-based cyanidation tailings

Examples

Experimental program
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Effect test

Embodiment 1

[0089] The clean utilization method of siderite enhanced iron-based cyanide tailings, the overall process flow chart is as follows figure 1 Shown, this example feeds the tailings that adopts whole mud cyanidation leaching gained tailings of a gold mine in Shanxi Province, wherein TFe content is 25.8%, (iron-containing minerals in the cyanide tailings are mainly limonite and hematite) The theoretical distribution rate of iron in limonite is 80%, and the gangue minerals are mainly mica, dolomite, calcite, and quartz) and the content of cyanide is 450mg / l. The required siderite is taken from the nearby gold mine. Concentrator (iron-containing minerals in siderite mainly exist in the form of siderite and hematite, and the distribution rates of iron in siderite and hematite are 91.20% and 7.91% respectively)

[0090] Step 1, material preparation: select the cyanidation tailings with a TFe content of 25% for pressure filtration dehydration to obtain tailings with a TFe content of 30...

Embodiment 2

[0105] The ore feeding of this example is the tailings obtained by the whole mud cyanidation leaching of a gold mine in a certain place in Yunnan Province, wherein the TFe content is 28%, and the cyanide content is 310mg / l, (iron-containing minerals in the cyanide tailings are mainly limonite) form, the theoretical distribution rate of iron in limonite is 95%, and the gangue minerals are mainly mica, dolomite, quartz) The required siderite is taken from the nearby ore processing plant (iron-containing minerals in siderite It mainly exists in the form of siderite and hematite, and the distribution rates of iron in siderite and hematite are 85.70% and 13.42% respectively)

[0106] Step 1, material preparation: select the cyanidation tailings with TFe content 28% to carry out pressure filtration dehydration, obtain TFe content 32%, water content 10% tailings, tailings after treatment -0.043mm particle size mass content more than 85% The obtained siderite ore is crushed and ground...

Embodiment 3

[0124] In this example, the ore feed is the tailings obtained by cyanidation leaching of a gold mine in a certain place in Henan Province, wherein the TFe content is 23.54%, (the iron-containing minerals in the cyanide tailings mainly exist in the form of limonite and goethite, The gangue minerals are mainly mica, dolomite, calcite, and quartz) with a cyanide content of 450 mg / l, and the required siderite is taken from a beneficiation plant near the gold mine (the iron-containing minerals in siderite are mainly siderite and red It exists in the form of iron ore, and the distribution rates of iron in siderite and hematite are 89.17% and 7.91%, respectively)

[0125] Step 1, material preparation: select cyanidation tailings with a TFe content of 23.54% for pressure filtration dehydration to obtain tailings with a TFe content of 28% and a water content of 8%. After the tailings are treated, the mass content of -0.043mm particle size is more than 95%; The obtained siderite ore is cr...

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Abstract

The invention discloses a clean utilization method of siderite reinforced iron-based cyanidation tailings, and belongs to the field of mineral processing technologies and environments. The method comprises the following steps: preparing iron-based cyanidation tailings meeting corresponding requirements, and roasting to complete material dehydration, detoxification and cyanogen breaking; discharging, by a dehydration cyclone system, water vapor generated after passing through an oxidizing roasting system; adding siderite; feeding the product together with oxidized iron-based cyanidation tailings into a suspension roasting system, and controlling the corresponding reducing atmosphere and temperature; and performing two-stage cooling on the reduced material to room temperature, and performing two-stage magnetic separation to obtain high-grade iron ore concentrate and tailings which can be used as building materials such as cement. The method has the advantages that cyanogen breaking and detoxification of the cyanidation tailings are completed through the high-temperature oxidizing atmosphere, and iron mineral pore cracking active sites are enhanced, meanwhile, the siderite is adopted for completing conversion of iron minerals in the iron-based cyanidation tailings to magnetite, and a new way is developed for clean recycling of the iron-based cyanidation tailings.

Description

Technical field: [0001] The invention belongs to the technical field, and in particular relates to a method for clean utilization of siderite-enhanced iron-based cyanide tailings. Background technique: [0002] Gold and other precious metal smelting enterprises discharge a large amount of cyanide tailings every year, which contain valuable metals such as gold, silver, copper, iron, zinc, etc., especially iron-based cyanide tailings, because of the economic value of precious metals And because of the limitations of the sorting process, a large amount of iron-containing minerals exist in the cyanide tailings in the form of tailings, and the iron content in some cyanide tailings is as high as 40%. Cyanide tailings are mostly discharged in the form of stockpiling in tailings ponds. The long-term stockpiling not only occupies land, but also pollutes the environment. [0003] Existing cyanide tailings treatment technologies, such as hydrogen peroxide oxidation method, biological ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06C22B1/02
CPCC01G49/06C22B1/02Y02P10/20
Inventor 李文博韩跃新李朋超李艳军
Owner NORTHEASTERN UNIV
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