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Calcium aluminate slag containing sodium oxide and titanium oxide

A technology containing sodium oxide and calcium aluminate is applied in the fields of calcium aluminate slag containing titanium oxide and sodium oxide, which can solve the problems of low alumina leaching rate from the slag, and achieve the effects of improving economic benefits and increasing production.

Inactive Publication Date: 2013-10-23
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the calcium aluminate slag used as the raw material for alumina extraction contains a certain amount of sodium oxide and titanium oxide, resulting in a low leaching rate of slag alumina, and then provide a high alumina leaching rate. Calcium aluminate slag of sodium and titanium oxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1: slag composition is proportioned by mass percentage, wherein, Na 2 O1.96%, TiO 2 3.93%, CaO56.60%, SiO 2 20.64%, Al 2 o 3 16.87%, totaling 100%. Al in the prepared material 2 o 3 with SiO 2 The mass ratio of CaO is 0.8; the total amount of CaO added meets the three requirements, first of all, it meets the requirements of SiO 2 The reaction generates 2CaO. SiO 2 requirements, and secondly to meet the requirements of Al 2 o 3 The reaction produces 12CaO. 7Al 2 o 3 The amount of CaO required, but also to meet the requirements of TiO 2 Calcium content, for TiO 2 The mass percentage of CaO allocated is 2.24%, and this part of CaO and TiO 2 The mass ratio of the substance is converted into a molar ratio of 0.8.

[0010] The above-mentioned materials are smelted at 1550°C for 1 hour, then cooled to 1200°C at a cooling rate of 4-5°C / min, and then naturally cooled to room temperature to obtain calcium aluminate slag.

[0011] The alumina leaching ...

Embodiment 2

[0012] Embodiment 2: slag composition is proportioned by mass percentage, wherein, Na 2 O1.87%, TiO 2 5.61%, CaO56.76%, SiO 2 19.67%, Al 2 o 3 16.08%, totaling 100%. Al in the prepared material 2 o 3 with SiO 2 The mass ratio of CaO is 0.8; the total amount of CaO added meets the three requirements, first of all, it meets the requirements of SiO 2 The reaction generates 2CaO. SiO 2 requirements, and secondly to meet the requirements of Al 2 o 3 The reaction produces 12CaO. 7Al 2 o 3 The amount of CaO required, but also to meet the requirements of TiO 2 Calcium content, for TiO 2 The mass percentage of CaO allocated is 5.25%, and this part of CaO and TiO 2 The mass ratio is converted into a material molar ratio of 1.25.

[0013] The above materials were smelted and cooled under the same process conditions as in Example 1 to obtain calcium aluminate slag.

[0014] Alumina leaching condition is identical with embodiment 1, Al 2 o 3 The leaching rate was 84.1%....

Embodiment 3

[0015] Embodiment 3: slag composition is proportioned by mass percentage, Na 2 O3.82%, TiO 2 3.82%, CaO54.50%, SiO 2 18.94%, Al 2 o 3 18.94%, for a total of 100%. Al in the prepared material 2 o 3 with SiO 2 The mass ratio of the substance is 1.0; the total amount of CaO added meets the three requirements, first of all, it meets the requirements of SiO 2 The reaction generates 2CaO. SiO 2 requirements, and secondly to meet the requirements of Al 2 o 3 The reaction produces 12CaO. 7Al 2 o 3 The amount of CaO required, but also to meet the requirements of TiO 2 Calcium content, for TiO 2 The CaO mass percentage that is allocated is 1.4%, this part CaO and TiO 2 The mass ratio of the substance is converted into a molar ratio of 0.5.

[0016] The above materials were smelted and cooled under the same process conditions as in Example 1 to obtain calcium aluminate slag.

[0017] Alumina leaching condition is identical with embodiment 1, Al 2 o 3 The leaching rate...

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Abstract

The invention relates to a calcium aluminate slag containing sodium oxide and titanium oxide which has a high alumina leaching rate. The slag comprises the following proportioning materials, by mass, 1.5% to 4% of Na2O, 23.5% to 6% of TiO, 54 to 57% of CaO, 17 to 21% of SiO2, 16 to 20% of Al2O3 and the total of 100%. The mass ratio of Al2O3 to SiO2 in the materials is 0.8 to 1.0. The total amount of CaO meets the following three requirements: the first requirement that CaO reacts with SiO2 to produce 2CaO. SiO2 is met; the second requirement of needed CaO amount to produce 12CaO. 7Al2O3 by reacting with Al2O3 is met; and the third requirement of needed CaO amount to have a molar ratio of 0.5 to 1.25 with TiO2 on the basis of the Na2O and TiO2 content in the slag is met. The alumina leaching rate of the slag increases to more than 83% compared with the initial 78%.

Description

technical field [0001] The invention relates to a calcium aluminate slag used for extracting alumina, in particular to calcium aluminate slag containing sodium oxide and titanium oxide with high alumina leaching rate. Background technique [0002] Lime sintering method is one of the methods for industrial production of alumina. Calcium aluminate slag is obtained by sintering aluminum-containing materials through lime, and calcium aluminate slag is the raw material for extracting alumina. The main phase of calcium aluminate slag is 12CaO. 7Al 2 o 3 , 2CaO. SiO 2 , 12CaO in calcium aluminate slag. 7Al 2 o 3 Alumina is extracted by leaching with sodium carbonate solution. Therefore, in the traditional lime sintering process, the amount of CaO added in addition to meeting the SiO 2 The reaction generates 2CaO. SiO 2 In addition to the requirements of Al 2 o 3 The reaction produces 12CaO. 7Al 2 o 3 The amount of calcium required, that is, the total amount of CaO a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/16C01F7/18
Inventor 佟志芳李英杰廉丽秀
Owner JIANGXI UNIV OF SCI & TECH
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