A method for clean utilization of siderite-enhanced iron-based cyanide tailings

A technology for cyaniding tailings and siderite, applied in iron oxide/iron hydroxide, iron oxide, process efficiency improvement, etc., can solve the problems of high processing cost, land occupation, environmental pollution, etc., and reduce hazardous waste Effects on output, reduction in use, and increase in economic benefits

Active Publication Date: 2022-04-08
NORTHEASTERN UNIV LIAONING
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  • Description
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Problems solved by technology

Cyanide tailings are mostly discharged in the form of tailings storage. The long-term storage 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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  • A method for clean utilization of siderite-enhanced iron-based cyanide tailings
  • A method for clean utilization of siderite-enhanced iron-based cyanide tailings
  • A method for clean utilization of siderite-enhanced iron-based cyanide tailings

Examples

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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 450mg / 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 c...

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Abstract

The invention relates to a clean utilization method of siderite-enhanced iron-based cyanide tailings, which belongs to the field of mineral processing technology and environment. The steps include: preparing the iron-based cyanide tailings according to the requirements, dehydrating the material after roasting, and detoxifying and breaking the cyanide; the water vapor generated after the oxidation and roasting system is discharged by the dehydration cyclone system, adding siderite, and the oxidized iron The base cyanide tailings enter the suspension roasting system together, and the corresponding reducing atmosphere and temperature are controlled; the reduced material is cooled to room temperature in two stages, and separated by two-stage magnetic separation to obtain high-grade iron concentrate and can be used as building materials such as cement tailings. The invention has the advantages of using high-temperature oxidative atmosphere to complete the cyanide breaking and detoxification of cyanide tailings, and the enhancement of iron mineral pore cracking active sites, and simultaneously uses siderite to complete the conversion of iron minerals in iron-based cyanide tailings to magnetite, It opens up a new way for the clean recycling of ferricyanide 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 tailings stockpiles. 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 method, in...

Claims

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Application Information

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Patent Type & Authority Patents(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 LIAONING
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