Method for efficiently recycling ferro-aluminium from bauxite tailings and synchronously preparing high siliceous residues

A bauxite and aluminum recovery technology, applied in the direction of improving process efficiency, can solve the problems of no thermal activation, low recovery rate of leachables, large amount of residue, etc., and achieve the effect of wide application range of raw materials

Inactive Publication Date: 2013-12-04
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

The above patents provide a new technical method for preparing chemical products from low-grade bauxite or bauxite tailings, but there are problems such as low recovery rate of leachate or large amount of residues, etc. Therefore, the present invention proposes bauxite tailings The method of high-efficiency recovery of aluminum and iron from ore and synchronous preparation of high silicic acid slag, its technical characteristics are: the tailings are not thermally activated, after drying and grinding, 98% sulfuric acid is directly added to form balls, and they are roasted in a fixed bed device at 250-300 °C 0.5~1h, add concentrated sulfuric acid directly from the top of the material during the roasting process, the acid mist is discharged after being absorbed by the alkali; the roasted product is directly added with washing liquid to dissolve the acid-soluble matter, and the yield of iron and aluminum can reach 99% and 97%

Method used

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  • Method for efficiently recycling ferro-aluminium from bauxite tailings and synchronously preparing high siliceous residues

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Effect test

Embodiment approach 1

[0035] Implementation mode one: if figure 1 As shown, the method for the high-efficiency recovery of aluminum and iron from the bauxite beneficiation tailings of the present embodiment to simultaneously prepare high silicic acid slag is:

[0036] (1) Dry and grind the bauxite tailings until the 100-mesh sieve balance is less than 5%, add concentrated sulfuric acid and mix evenly, and make according to the mass ratio of tailings powder and concentrated sulfuric acid 1:1.2 The sphere is then heated to 250°C for roasting. During the roasting process, concentrated sulfuric acid is continuously added to keep the concentrated sulfuric acid liquid from flowing out of the bauxite tailings sphere. The total amount of sulfuric acid added is 1.2 times the theoretical acid consumption of aluminum and iron oxides in bauxite tailings, and roasted under the above conditions for 0.5h; bauxite tailings are solid waste after bauxite wet beneficiation , the main chemical composition Al in the b...

Embodiment approach 2

[0039] Implementation mode two: if figure 1 As shown, the method for the high-efficiency recovery of aluminum and iron from the bauxite beneficiation tailings of the present embodiment to simultaneously prepare high silicic acid slag is:

[0040] (1) Dry and grind the bauxite tailings until the 100-mesh sieve balance is less than 5%, add concentrated sulfuric acid to mix evenly and make a sphere, then heat to 300°C and roast. Concentrated sulfuric acid is continuously added during the process to shorten the acid addition time while keeping the concentrated sulfuric acid liquid from flowing out of the bauxite tailings sphere. The acid addition time is 15 minutes in total. The total amount of concentrated sulfuric acid added is The theoretical acid consumption of aluminum and iron oxides is 1 time, roasted under the above conditions for 0.8h; the main chemical composition of bauxite tailings is Al 2 o 3 , Fe 2 o 3 , SiO 2 、TiO 2 , MgO, and CaO are respectively: 38.88%, 26....

Embodiment approach 3

[0043] Implementation mode three: if figure 1 As shown, the method for the high-efficiency recovery of aluminum and iron from the bauxite beneficiation tailings of the present embodiment to simultaneously prepare high silicic acid slag is:

[0044] (1) Dry and grind the bauxite tailings until the 100-mesh sieve balance is less than 5%, add concentrated sulfuric acid to mix evenly and make a sphere, then heat to 260°C and roast. Concentrated sulfuric acid is continuously added during the process to shorten the acid addition time while keeping the concentrated sulfuric acid liquid from flowing out of the bauxite tailings sphere. The total amount of concentrated sulfuric acid added is the theoretical consumption of aluminum and iron oxides in the bauxite tailings 1.4 times the amount of acid, roasted under the above conditions for 1 hour; the tail gas produced by roasting the bauxite tailings spheres is absorbed by the lye and discharged. Main chemical composition Al in bauxite ...

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Abstract

The invention relates to a method for efficiently recycling ferro-aluminium from bauxite tailings and synchronously preparing high siliceous residues, and belongs to the technical field of waste comprehensive utilization and mineral resource processing. The method comprises the following steps: drying and grinding bauxite tailings, adding concentrated sulfuric acid, uniformly mixing, making into spheres, then heating and calcining, continually adding concentrated sulfuric acid during the calcining process, adding cleaning solution and leaching calcined bauxite tailings spheres, filtering, and gaining filter liquor, namely acid leaching initial liquid, gaining filter residue from filter cake to gain filter residue, namely high siliceous residue, and taking the gained cleaning solution as leaching agent of bauxite tailings spheres for next calcining to use; neutralizing the acid leaching initial liquid by grinding tailings, filtering, and gaining filter liquor, namely solution containing aluminum sulfate and ferric sulfate. The method realizes enrichment and edulcoration of silicon, and the recycle of silicon from the acid leaching residue or the preparation of silicate products is facilitated.

Description

technical field [0001] The invention relates to a method for synchronously preparing high silicic acid slag by recycling aluminum and iron from bauxite dressing tailings, and belongs to the technical fields of waste comprehensive utilization and mineral resource processing. Background technique [0002] Bauxite is a multi-mineral mixture mainly composed of gibbsite, diaspore and other hydrous alumina minerals, and also contains kaolinite, opal, hematite and other components. The mineral raw material of aluminum cement, the chemical formula is Al 2 o 3 ·nH 2 O is mainly used to produce alumina, which accounts for more than 90% of the world's total bauxite production. [0003] The vast majority of bauxite in my country belongs to the diaspore type with high aluminum, high silicon and low iron, and more than 80% of the bauxite has an aluminum-silicon ratio between 5 and 8, so the more economical conventional Bayer can not be used. production of alumina. According to the cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B21/00C22B1/06C22B3/08
CPCY02P10/20
Inventor 夏举佩张召述刘成龙
Owner KUNMING UNIV OF SCI & TECH
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