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Method for arranging in piles the tailings generated by iron ore processing

A technology for iron ore and tailings, which is used in the field of dry stacking treatment of tailings in iron ore beneficiation processes, and can solve the problems of not providing long-term stacking stability opinions and structural parameters.

Pending Publication Date: 2021-12-24
VALE LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The document also does not provide opinions and construction parameters regarding long-term stacking stability

Method used

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  • Method for arranging in piles the tailings generated by iron ore processing
  • Method for arranging in piles the tailings generated by iron ore processing
  • Method for arranging in piles the tailings generated by iron ore processing

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Embodiment

[0084] Iron ore tailings treatment trials were carried out at a pilot plant to assess the technical and operational feasibility of dry-stacking tailings. Tailings from the processing of compact-structured ilmenite ore from iron mining operations in the Quadrilátero Ferrífero region (Minas Gerais, Brazil) were used for the test.

[0085] Table 1 lists the average chemical composition of the tailings sand and the ultrafine tailings used in the pilot plant tests.

[0086] Table 1 - Chemical composition of iron ore tailings

[0087]

[0088] The first step consists in thickening the ultrafine tailings in a high density thickener (HD-High Density). The obtained underflow solid mass concentration is 45%-55%.

[0089] The second step involves thickening the tailing sands in a conventional thickener. A conventional thickener with a diameter of 8.2 meters was used, with a processing capacity of 110 tons / hour and a unit area of ​​0.020 square meters / ton / day. Since it is possible ...

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Abstract

The present invention discloses a method for arranging in piles, instead of in dams, the tailings generated by iron ore processing, said method comprising the steps of thickening the ultrafine tailings, thickening the sandy tailings, mixing the tailings at a ratio of 80-90% sandy tailings to 10-20% ultrafine tailings by weight, adding coagulant, adding flocculent, filtering the mixture and piling the filtered tailings. Unlike the traditional methods, the present invention provides an economically and technically viable method for arranging tailings in piles, which can be used in any conventional iron ore concentration plant without having to alter the process flows in any way.

Description

technical field [0001] The invention relates to a method mainly used in the mining industry for dry-stacking the tailings in the iron ore beneficiation process. Background technique [0002] The iron ore beneficiation process aims to separate and enrich the required materials with high iron content and high economic added value from the materials produced by (mining ore) extraction. The most commonly used processes in the mining industry include several stages consisting of a single operation of crushing (crushing and grinding), particle size classification, and separation and enrichment (flotation and magnetic separation) of mined ore. The beneficiation process also produces tailings materials with low iron content and low economic added value. As the ore beneficiation process typically involves the addition of water, tailings are typically produced as a slurry and disposed of in tailings storage dams. [0003] Currently, the mining industry generates hundreds of millions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14B03D1/08B03D1/10B09B3/00C02F103/10
CPCB03D1/08B03D1/10B03D1/087B03D2201/002B03D2203/02C02F11/121C02F11/14C02F2103/10B09B3/25B01D21/01B01D2221/04B03D3/06C02F11/143C02F11/147B09B3/70Y02W30/52
Inventor N·C·托尔夸托W·P·达席尔瓦
Owner VALE LIMITED
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