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

A technology for recovering pyrite and aluminum, applied to chemical instruments and methods, silicon oxide, silicon dioxide, etc., can solve the problems of public safety hazards, environmental pollution, land occupation, etc., and achieve shortened synthesis time, excellent performance, Effects that speed up generation

Active Publication Date: 2012-04-11
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 safet

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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

Examples

Experimental program
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Example Embodiment

[0032] Example 1

[0033] The flotation tailings are first oxidized and calcined at a calcination temperature of 1050°C and a calcination time of 15 minutes. The flue gas generated during the calcination process is discharged after desulfurization; the tailings calcination with a fineness of -0.074mm is dissolved in caustic soda. The temperature is 140℃, the dissolution time is 30min, the concentration of dissolved sodium hydroxide is 140g / L, and the mass ratio of dissolved liquid is 10:1. Under these conditions, the dissolution rate of silica is 53.67%, which 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.

Example Embodiment

[0034] Example 2

[0035] The flotation tailings are first oxidized and calcined at a calcination temperature of 1100°C and a calcination time of 15 minutes. The flue gas generated during the calcination process is discharged after desulfurization; the tailings calcination with a fineness of -0.074mm is dissolved with caustic soda. The temperature is 140℃, the dissolution time is 30min, the concentration of dissolved sodium hydroxide is 140g / L, and the mass ratio of dissolved liquid is 10:1. Under these conditions, the dissolution rate of silica is 70.99%, which 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.

Example Embodiment

[0036] Example 3

[0037] The flotation tailings are first oxidized and calcined at a calcination temperature of 1150°C and a calcination time of 15 minutes. The flue gas generated during the calcination process is discharged after desulfurization; the tailings calcination with a fineness of -0.074mm is dissolved with caustic soda. The temperature is 140℃, the dissolution time is 30min, the concentration of dissolved sodium hydroxide is 140g / L, and the mass ratio of dissolved liquid is 10:1. Under these conditions, the dissolution rate of silica is 72.97%, which 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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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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