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Method for comprehensively recovering aluminum, silicon and titanium from pyrite tailings

A technology for pyrite and aluminum recovery, applied in chemical instruments and methods, silicon oxide, silicon dioxide, etc., can solve problems such as hidden dangers to public safety, environmental pollution, land occupation, etc., to shorten synthesis time, excellent performance, The effect of speeding up the generation

Active Publication Date: 2013-08-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of waste of aluminum, silicon and titanium resources in pyrite flotation tailings, land occupation of tailings solid waste, environmental pollution, and potential public safety hazards, and provide a pyrite A method for comprehensively recovering aluminum, silicon, and titanium from pyrite tailings for cascade separation, enrichment and value-added processing of aluminum, silicon, and titanium in flotation tailings

Method used

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  • Method for comprehensively recovering aluminum, silicon and titanium from pyrite tailings
  • Method for comprehensively recovering aluminum, silicon and titanium from pyrite tailings
  • Method for comprehensively recovering aluminum, silicon and titanium from pyrite tailings

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Embodiment 1

[0033] The flotation tailings are first oxidized and calcined, the calcining temperature is 1050°C, and the calcining time is 15 minutes. The flue gas generated during the calcining process is discharged after desulfurization; The temperature is 140°C, the dissolution time is 30min, the concentration of dissolved sodium hydroxide is 140g / L, and the mass ratio of dissolved liquid to solid is 10:1. Under these conditions, the dissolution rate of silicon dioxide is 53.67%. It is obtained by solid-liquid separation Al in alumina concentrate 2 o 3 The content is 62.43%, Al 2 o 3 with SiO 2 The mass percentage ratio A / S is 3.46.

Embodiment 2

[0035]The flotation tailings are first oxidized and calcined, the calcining temperature is 1100°C, and the calcining time is 15 minutes. The flue gas generated during the calcining process is discharged after desulfurization; The temperature is 140°C, the dissolution time is 30min, the concentration of dissolved sodium hydroxide is 140g / L, and the mass ratio of dissolved liquid to solid is 10:1. Under these conditions, the dissolution rate of silicon dioxide is 70.99%. It is obtained by solid-liquid separation Al in alumina concentrate 2 o 3 The content is 68.60%, Al 2 o 3 with SiO 2 The mass percentage ratio A / S is 5.51.

Embodiment 3

[0037] The flotation tailings are first oxidized and calcined, the calcining temperature is 1150°C, and the calcining time is 15 minutes. The flue gas generated during the calcining process is discharged after desulfurization; The temperature is 140°C, the dissolution time is 30min, the concentration of dissolved sodium hydroxide is 140g / L, and the mass ratio of dissolved liquid to solid is 10:1. Under these conditions, the dissolution rate of silicon dioxide is 72.97%. It is obtained by solid-liquid separation Al in alumina concentrate 2 o 3 The content is 69.49%, Al 2 o 3 with SiO 2 The mass percentage ratio A / S is 5.93.

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Abstract

The invention discloses a method for comprehensively recover aluminum, silicon and titanium from pyrite tailings. The method comprises the following steps: performing oxidizing roasting on the pyrite flotation tailings, adding a sodium hydroxide solution to stir and dissolve out silica in roasted tailings, performing solid-liquid separation to obtain a solid product and a liquid product, wherein the solid product is aluminum oxide concentrate and the liquid product is a solution containing silica and alkali; using the aluminum oxide concentrate as the raw material and adopting the Bayer process to extract aluminum oxide, purifying the Bayer process white clay to prepare a material with rich titanium; adding active quick lime in the solution containing silica and alkali to control the synthesis reaction of sodium silicate and calcium oxide and generate calcium silicate hydrate whisker, regenerating the sodium hydroxide solution; and sending the regenerated caustic alkali solution back to leach the new roasted tailings. By adopting the method, the step separation and concentration and value-added processing of aluminum, silicon and titanium in the pyrite resource can be realized, the problem that the solid waste of the tailings is stocked to occupy the land, pollute the environment and cuase potential public safety hazards can be solved and the economic, social and environmentalbenefits are great; and a new method is provided to realize no-waste mining.

Description

technical field [0001] The invention relates to a method for comprehensively utilizing pyrite tailings, in particular to a method for comprehensively recovering aluminum, silicon and titanium from pyrite tailings, and belongs to the technical field of mineral processing engineering. Background technique [0002] Pyrite is the main sulfur resource in my country, accounting for 80% of the total sulfur resources. At present, 40% to 50% of sulfuric acid in China is produced from pyrite. In the future, pyrite will still occupy an important position in my country's sulfuric acid production. . [0003] There are a large amount of high-alumina and high-silicon pyrite resources in my country, which is a product of (mud-containing) diaspore type bauxite undergoing alteration such as uneven pyrite mineralization. The ore has altered minerals. The disseminated structure, porphyritic structure formed by even replacement of the original rock, and the structure formed by the diaspore-type b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/02C22B3/12C22B21/00C22B34/12C30B7/10C30B29/34C01F7/02C01G23/047C01B33/12
CPCY02P10/20
Inventor 李光辉姜涛蒋昊范晓慧张元波张吉清罗骏郭宇峰杨永斌李骞陈许玲许斌朱忠平饶明军刘明霞智谦陈浩远王剑
Owner CENT SOUTH UNIV
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