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Prepn process of Bayer process leaching additive

An additive, the technology of Bayer method, applied in the field of preparation of Bayer method dissolution additive, can solve the problems such as complex preparation process and complicated preparation method of additives, and achieve the effect of simplifying the preparation process, simplifying the preparation process and reducing the ratio of sodium to silicon

Active Publication Date: 2007-01-03
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Description
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Problems solved by technology

However, the preparation method is complicated, and iron ore and limestone need to be sintered at a sintering temperature of 1160-1260°C for 60-90 minutes to obtain 2CaO Fe 2 o 3 , the calcined dicalcium ferrite is prepared according to the proportion of CaO and calcium ferrite as 1:1, adding lime at a certain temperature (25-60°C) under the condition of lye concentration (30-80g / l), a certain solid content (200-300g / L) react for 6-8 hours to hydrate to obtain calcium ferrite hydrate, which has a hexagonal crystal structure. Since iron hydration garnet has a cubic crystal structure, it needs to be heated again at a higher temperature and a higher alkali Under the condition of concentration, the cubic crystal structure is formed after phase inversion treatment, so that it can be used as a dissolution additive to achieve the purpose of reducing alkali consumption and improving the recovery rate of alumina. The additive preparation process is very complicated

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Dicalcium ferrite is obtained by burning iron ore and limestone at 1180°C for 90 minutes. The ratio of CaO to calcium ferrite is 1:1, and lime is added for phase inversion treatment. The phase inversion condition is lye N k It was 260g / L, the solid content was 80g / L, the reaction temperature was 150°C, and the additive was obtained after 2 hours of reaction. Then use the evaporated mother liquor on the industrial site to dissolve the Henan Pu Aluminum Mine with an aluminum-silicon ratio of 6, and hydrate the garnet 3CaO Fe according to the generated iron hydration 2 o 3 · nSiO2 2 ·(6-2n)H 2 The coefficient in O is n=2.0, and the additive calcium ferrite hydrate 3CaO·Fe is added 2 o 3 ·6H 2 O, the leaching was carried out at a temperature of 260°C for 45 minutes, the aluminum-silicon ratio of the leached red mud was 0.73, and the sodium-silicon ratio was 0.20.

Embodiment 2

[0016] Dicalcium ferrite is obtained by burning iron ore and limestone at 1180°C for 90 minutes. The ratio of CaO to calcium ferrite is 1:1, and lime is added for phase inversion treatment. The phase inversion condition is lye N k It was 260g / L, the solid content was 80g / L, the reaction temperature was 160°C, and the additive was obtained after 1 hour of reaction. Then use the evaporated mother liquor on the industrial site to dissolve the Henan Pu Aluminum Mine with an aluminum-silicon ratio of 6, and hydrate the garnet 3CaO Fe according to the generated iron hydration 2 o 3 · nSiO2 2 ·(6-2n)H 2 The coefficient in O is n=2.0, and the additive calcium ferrite hydrate 3CaO·Fe is added 2 o 3 ·6H 2 O, the leaching was carried out at a temperature of 260°C for 45 minutes, and the aluminum-silicon ratio of the leached red mud was 0.67, and the sodium-silicon ratio was 0.21.

Embodiment 3

[0018] Dicalcium ferrite is obtained by burning iron ore and limestone at 1180°C for 90 minutes. The ratio of CaO to calcium ferrite is 1:1, and lime is added for phase inversion treatment. The phase inversion condition is lye N k It was 260g / L, the solid content was 180g / L, the reaction temperature was 130°C, and the additive was obtained after 4 hours of reaction. Then use the evaporated mother liquor on the industrial site to dissolve the Henan Pu Aluminum Mine with an aluminum-silicon ratio of 6, and hydrate the garnet 3CaO Fe according to the generated iron hydration 2 o 3 · nSiO2 2 ·(6-2n)H 2 The coefficient in O is n=2.0, and the additive calcium ferrite hydrate 3CaO·Fe is added 2 o 3 ·6H 2 O, the leaching was carried out at a temperature of 260°C for 45 minutes, the aluminum-silicon ratio of the leached red mud was 0.68, and the sodium-silicon ratio was 0.19.

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Abstract

The preparation process of Bayer process leaching additive of hydrated calcium ferrite, 3CaO .Fe2O3 .6H2O, includes the following steps: 1. baking iron ore and limestone to produce dicalcium ferrite, 2CaO .Fe2O3; and 2. adding lime for phase change according to the equal material ratio between CaO and calcium ferrite at the conditions of alkali concentration Nk of 100-300 g / L, solid content of 50-300 g / L, temperature of 80-160 deg.c and reaction time of 0.5-16 hr, to obtain the additive. The Bayer process leaching additive has lowered Al / Si ratio and Na / Si ration of the leached red mud.

Description

technical field [0001] A method for preparing a Bayer dissolution additive, which relates to the preparation of a dissolution additive for reducing the aluminum-silicon ratio and sodium-silicon ratio in the dissolved red mud during the Bayer dissolution process using diaspore-type bauxite Preparation method, especially Bayer process dissolution additive calcium ferrite hydrate 3CaO·Fe 2 o 3 ·6H 2 O preparation method. technical background [0002] In the Bayer dissolution process of processing diaspore bauxite, lime is usually added as a dissolution additive at 5% to 8% of the dry ore amount. The addition of lime can increase the dissolution rate of alumina and reduce the alkalinity. However, under normal circumstances, the aluminum-silicon ratio of the dissolved red mud is 1.5-2.0, and the sodium-silicon ratio is about 0.6. If this part of the dissolved red mud is not recycled, it will cause a large loss of alkali and reduce the utilization rate of ore; if it is recycle...

Claims

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Application Information

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IPC IPC(8): C22B3/04C22B1/16
CPCY02P10/20
Inventor 李新华尹中林王亚东邓平武国宝
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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