Method for comprehensively utilizing low-grade aluminum resource

A low-grade, resource-based technology, applied in the preparation of alumina/aluminum hydroxide, alkali metal aluminate/alumina/aluminum hydroxide, calcium/strontium/barium oxide/hydroxide, etc., to improve economic benefits , reduce the amount of lime added, reduce the effect of energy consumption

Active Publication Date: 2019-11-12
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned problems existing in the existing lime sintering process, the present invention provides a method for comprehensive utilization of low-grade aluminum resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for improving the dissolution rate of alumina in low-grade aluminum resources and comprehensively utilizing low-grade aluminum resources, comprising the following steps:

[0026] S1: The Bayer process high-speed iron red mud (chemical composition: Al 2 O 3 16.99%, SiO 2 10.47%, Fe 2 O 3 24.39%, TiO 2 2.79%, CaO 30.8% and Na 2 O 0.74%, the rest are impurities that do not affect the subsequent reaction) crushed to a particle size of ≤75μm and the content of the components accounted for more than 90%, according to C / A=1.0, C / S=1.0 and F / S=1:3 to mix lime and calcium ferrite, the mass percentage of each element in lime is: CaO 50.9%, MgO 1.2%, and the rest are impurities. The above raw materials are uniformly mixed and prepared into pellets with a diameter of 1-1.2 cm, which are calcined at 1350° C. for 120 min to obtain sintered clinker, which is taken out and rapidly cooled in air.

[0027] S2: The cooled clinker is dissolved in 1.0 mol / L sodium carbona...

Embodiment 2

[0030] A method for improving the dissolution rate of alumina in low-grade aluminum resources and comprehensively utilizing low-grade aluminum resources, comprising the following steps:

[0031] S1: The high-speed iron fly ash is subjected to pre-desilication treatment in a 3 mol / L NaOH solution, and the chemical composition of the obtained desiliconized fly ash is Al 2 O 3 70.38%, SiO 2 20.32%, Fe 2 O 3 5.26%, and the rest are impurities that do not affect subsequent reactions. Take desiliconized fly ash, calcium ferrite and lime as raw materials, mix materials according to C / A=1.05, C / S=1.05 and F / S=1:3.2, and add 2% binder by mass of the mixture , and prepared into 1.0cm pellets after mixing, dried at 120°C for 6.0h and calcined at 1375°C for 120min to obtain sintered clinker, which was taken out for rapid cooling in the air.

[0032]S2: After cooling, the clinker is dissolved in 1.0 mol / L sodium carbonate solution for alumina dissolution, the temperature is 70 °C, ...

Embodiment 3

[0035] A method for improving the dissolution rate of alumina in low-grade aluminum resources and comprehensively utilizing low-grade aluminum resources, comprising the following steps:

[0036] S1: Take high iron bauxite (chemical composition: Al 2 O 3 33.25%, Fe 2 O 3 40.32%, SiO 2 18.26, the rest are impurities that do not affect the subsequent reaction), according to C / A=1.05, C / S=1.05 and F / S=1:3.2, add lime and calcium ferrite, the mass percentage of each element in the lime is: CaO 51.75%, MgO 0.8%, and the rest are impurities that do not affect subsequent reactions. The above raw materials were mixed uniformly and prepared into pellets with a diameter of 1.0 cm, which were calcined at 1375° C. for 100 min to obtain sintered clinker, which was taken out and rapidly cooled in air.

[0037] S2: The cooled clinker is subjected to alumina dissolution in a 1.0 mol / L sodium carbonate solution, the temperature is 70 °C, and the time is 45 min. After the dissolution is c...

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Abstract

The invention relates to the technical field of alumina production, and specifically discloses a method for comprehensively utilizing a low-grade aluminum resource. The method comprises the followingsteps: mixing the low-grade aluminum resource with lime and calcium ferrite, performing roasting dissolution to obtain a dissolution crude slag and a dissolution liquid, and performing impurity removal, carbonation decomposition and calcination on the dissolution liquid to obtain alumina; and performing smelting and refining on the dissolution crude slag and a carbonaceous reducing agent to obtaina ferrosilicon alloy. The provided method for improving a dissolution rate of alumina in the low-grade aluminum resource uses the low-grade aluminum resource as a raw material, a phase composition ofa clinker is changed by adding calcium ferrite, a lime compounding amount, sintering energy consumption and a slag discharge amount are reduced, a dissolution rate of alumina is 92% or more, and theferrosilicon alloy is also prepared while alumina is prepared.

Description

technical field [0001] The invention relates to the technical field of alumina production, in particular to a method for comprehensively utilizing low-grade aluminum resources. Background technique [0002] Low-grade bauxite (Al 2 O 3 / SiO 2 mass ratio less than 5), high-speed iron bauxite, high-alumina fly ash, nepheline, kaolinite, Bayer process red mud and other aluminum-containing resources. Among them, the grades of aluminum and iron cannot meet their respective industrial requirements, but the total content of aluminum and iron is considerable, and it is also rich in elements such as V, Ti, and Ni. The use of lime sintering to treat low-grade high-iron bauxite to produce alumina and iron oxide is an economical and feasible process at present. [0003] At present, the traditional lime sintering method utilizes Ca 12 Al 14 O 33 Good activity and Ca in sodium carbonate solution 2 SiO 4 Alumina is extracted from clinker with good pulverization performance after β-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/14C01F11/02C22C28/00C22C38/02
CPCC01F7/02C01F7/14C01F11/02C22C38/02C22C28/00
Inventor 张迪冯捷王波孙会兰
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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