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Improved soda lime sintering method for processing aluminum-containing raw material

A technology of soda lime and sintering method, which is applied in the direction of alumina/hydroxide, etc., can solve the problems of large consumption of limestone, large utilization of tailings, high sintering temperature, etc., and achieve high resource utilization efficiency, reduction of tailings, and high sintering temperature low effect

Active Publication Date: 2011-06-29
昊青薪材(北京)技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The limestone sintering method belongs to the alkali-free system. Although the clinker has the characteristics of self-powdering, there are problems such as high sintering temperature, large consumption of limestone, large amount of tailings (a mixture of dicalcium silicate and calcium carbonate), and difficulty in utilization.

Method used

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  • Improved soda lime sintering method for processing aluminum-containing raw material
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  • Improved soda lime sintering method for processing aluminum-containing raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Aluminum-containing raw material 1: Potassium-rich rock filter residue, the chemical composition is as follows (%):

[0026]

[0027] Among them, the A / S of potassium-rich rock potassium extraction filter residue is 0.75. Accurately take by weighing 1000g nepheline syenite potassium extraction filter residue, 665.3g industrial soda ash (purity is 99%) and 554.7g limestone (purity is 98%), mix and ball mill 1h in experimental ball mill, obtain raw meal powder; The raw material powder is filled in an alumina crucible, and placed in an experimental electric furnace at a constant temperature of 1050 ° C for 2 hours. After the reaction, the clinker is cooled to room temperature with the furnace; the sintered clinker is crushed into a sintered clinker powder, which is required to pass 120 mesh standard sieve; experimentally measured Al in sintered clinker 2 o 3 The standard dissolution rate is 95.2%.

Embodiment 2

[0029] Aluminum-containing raw material 2: Potassium feldspar desiliconization filter cake, the chemical composition is as follows (%):

[0030]

[0031] Among them, the A / S of the potassium feldspar desiliconization filter cake is 0.70. Accurately weigh 1000g potassium feldspar desiliconization filter cake, 733.1g industrial soda ash (purity is 99%) and 572.3g limestone (purity is 98%), mix and ball mill 1h in experimental ball mill, obtain raw meal powder; The raw material powder is filled in an alumina crucible, and placed in an experimental electric furnace at a constant temperature of 1150 ° C for 2 hours. After the reaction, the clinker is cooled to room temperature with the furnace; Mesh standard sieve; experimentally measured Al in sintered clinker 2 o 3 The standard dissolution rate is 96.8%.

Embodiment 3

[0033] Aluminum-containing raw material 3: desiliconized fly ash, the chemical composition is as follows (%):

[0034]

[0035]Among them, the A / S of desiliconized fly ash is 1.68. Accurately weigh 1000g of desiliconized fly ash, 1162.0g of industrial soda ash (purity is 99%) and 571.2g of limestone (purity is 98%), and mix ball milling in experimental ball mill for 1h to obtain raw meal powder; The body is filled in an alumina crucible, and placed in an experimental electric furnace at a constant temperature of 1000 ° C for 2 hours. After the reaction, the clinker is cooled to room temperature with the furnace; sieve; experimentally measured Al in sintered clinker 2 o 3 The standard dissolution rate is 93.7%.

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Abstract

The utility model discloses an improved soda lime sintering method for processing aluminum-containing raw material, and relates to the technical field of aluminum oxide production with a sintering method. The aluminum-containing raw material, limestone and soda ash are evenly mixed in a ball-milling manner according to a raw meal formula of the improved soda lime sintering method, thereby acquiring qualified raw meal; the raw meal is sintered at a high temperature, thereby acquiring sintered clinker; the sintered clinker is dissolved out, desiliconized, resolved and roasted; and an aluminum oxide product can be finally acquired. The raw meal formula of the improved soda lime sintering method is that the sum of the amount of Al2O3, the amount of Fe2O3 and the amount of SiO2 divided by the sum of the amount of Na2O and the amount of K2O is equal to 1.0 plus or minus 0.1 (a molar ratio), and the sum of the amount of SiO2 and the amount of TiO2 divided by CaO is equal to 1.0 plus or minus0.1 (the molar ratio). Compared with the prior art, the improved soda lime sintering method disclosed by the invention has great adaptability to aluminum-containing raw material in various grades, and has the advantages that the addition quantity of burdening lime stone is small, the resource utilization efficiency is high, the sintering temperature is low, the firing energy consumption is low, the firing temperature range is wide, and the industrialization is easy to implement.

Description

technical field [0001] The invention relates to a method for improving soda lime sintering in the alumina production process, in particular to the improvement of the raw material formula and the sintering system in the sintering process. Background technique [0002] The sintering method is one of the main production methods of alumina industry in the world at present. my country's sintering method was first introduced from the former Soviet Union. After more than half a century of theoretical research and production practice, it has gradually improved and formed the traditional soda lime sintering method well known in the industry. [0003] The core content of the traditional soda lime sintering method is: the oxides in the raw meal are converted into sodium aluminate (Na 2 O·Al 2 o 3 ), sodium ferrite (Na 2 O Fe 2 o 3 ), dicalcium silicate (2CaO SiO 2 ) and calcium titanate (CaO·TiO 2 ). The raw material formula of the traditional soda lime sintering method is: ...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 杨雪邹丹刘浩马鸿文
Owner 昊青薪材(北京)技术有限公司
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