Precipitation desulfurization method of high-sulfur bauxite leachate

A high-sulfur bauxite and leaching solution technology, which is applied in the purification of aluminate/alumina/aluminum hydroxide, preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problem of bauxite leaching solution containing High-efficiency and rapid desulfurization effect, which is conducive to large-scale application and low toxicity

Active Publication Date: 2022-01-11
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for precipitation desulfurization of high-sulfur bauxite leaching solution, in order to solve the problem of high sulfur content in bauxite leaching solution

Method used

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  • Precipitation desulfurization method of high-sulfur bauxite leachate

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Embodiment 1

[0022] In this embodiment, different precipitants and different concentrations are used to remove sulfur ions in the sodium aluminate solution after the leaching of high-sulfur bauxite, including the following steps:

[0023] (1) After the high-sulfur bauxite leaching tail liquid passes 25V direct current for 6 hours, take the positive part of the solution as the feed liquid,

[0024] (2) Weigh different precipitants to prepare a precipitant solution, add it dropwise to 1L feed solution, and stir to form a precipitate.

[0025] (3) Heating and boiling the precipitation solution for 0.5-1 hour, and stirring in due course during the heating period.

[0026] (4) cooling and filtering the heated solution, washing the precipitate twice with water to obtain a sulfur-containing filter residue, and retaining the original filtrate to determine the sulfur-containing ions in the filtrate.

[0027] To the former filtrate in step (4) utilize iodine-sodium thiosulfate titration to measure,...

Embodiment 2

[0033] In this embodiment, different concentrations of the same precipitating agent are used to remove sulfur ions in the sodium aluminate solution after the leaching of high-sulfur bauxite, including the following steps:

[0034] (1) After the high-sulfur bauxite leaching tail liquid passes 25V direct current for 6 hours, take the positive part of the solution as the feed liquid,

[0035] (2) Weigh the precipitant to prepare precipitant solutions with different concentrations, add it dropwise to 1L feed solution, and stir to form a precipitate.

[0036] (3) Heating and boiling the precipitation solution for 0.5-1 hour, and stirring in due course during the heating period.

[0037] (4) cooling and filtering the heated solution, washing the precipitate twice with water to obtain a sulfur-containing filter residue, and retaining the original filtrate to determine the sulfur-containing ions in the filtrate.

[0038] To the former filtrate in step (4) utilize iodine-sodium thiosu...

Embodiment 3

[0044] In this embodiment, whether the leaching solution of high-sulfur bauxite is electrified and whether a precipitant is added is used to remove sulfur ions in the sodium aluminate solution after leaching of high-sulfur bauxite, including the following steps:

[0045] (1) One part of high-sulfur bauxite leaching tail liquid is passed through 25V direct current for 6 hours, and then the positive electrode part solution is taken as feed liquid, and one part of high-sulfur bauxite leaching tail liquid is not energized as raw material liquid

[0046] (2) Take a certain amount of precipitant to prepare a solution, add it dropwise to 1L of feed liquid or raw material liquid, stir to form a precipitate,

[0047] (3) Heating and boiling the precipitation solution for 1 hour, stirring in due course during the heating period;

[0048] (4) cooling and filtering the heated solution, washing the precipitate twice with water to obtain a sulfur-containing filter residue, and retaining the...

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Abstract

The invention discloses a precipitation removal method for sulfur in Bayer process leachate of high-sulfur bauxite, and belongs to the technical field of aluminum smelting. The method comprises the following steps: putting the high-sulfur bauxite leachate into a U-shaped container, electrifying direct current for 5-6 hours, and taking out feed liquid connected to one end of a positive electrode; dissolving a precipitant in water according to the proportion of 5-50g/L, dropwise adding the precipitant solution into the feed liquid, and stirring the mixture to fully precipitate the material; heating and boiling the obtained mixed solution for 0.5-1 hour, and continuously stirring the solution; and cooling and filtering the heated solution, washing the precipitate with water to obtain sulfur-containing filter residues, and feeding the filtrate to a subsequent aluminum smelting process. The method is easy to operate and high in separation efficiency, the follow-up treatment burden of the leaching tail liquid can be relieved, and the production cost is reduced.

Description

technical field [0001] The invention relates to a precipitation desulfurization method of high-sulfur bauxite leachate, which belongs to the technical field of aluminum smelting. Background technique [0002] As my country's demand for metal aluminum has increased in recent years, it has become extremely critical to increase the output of alumina, the raw material for aluminum production. Bauxite is the main source of alumina, but there is a sulfur content in bauxite. The bigger problem is that when using it to produce alumina, there is a large amount of S in the sodium aluminate solution after the high-sulfur bauxite is leached by the Bayer method. 2- , SO 3 2- , S 2 o 3 2- , the content of sulfur-containing ions in the leaching solution is about 3g / L, which increases the viscosity of the leaching solution, affects the production process of alumina and leads to a decrease in the output of alumina. In the immersion environment, sulfide ions and alkali generate sodium su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/47
CPCC01F7/47C01P2006/80Y02P10/20
Inventor 字富庭王海文胡显智陈云龙
Owner KUNMING UNIV OF SCI & TECH
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