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Process for preparing alumina by two-component sintering method

A preparation process and alumina technology, which are applied in the preparation of alumina/hydroxide, alkali metal aluminate/alumina/aluminum hydroxide, alumina/aluminum hydroxide, etc., can solve problems such as loss and achieve The effect of improving the grade, reducing the material flow and lowering the production cost

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Problems solved by technology

[0005] The soda-lime sintering method prepares a slurry from three components of alkali, lime and ore. When the added lime is fired in the rotary kiln, it reacts with the silica in the bauxite to produce β-2CaO·SiO 2 , due to the decomposition of this substance during the clinker dissolution process, the generated Ca(OH) 2 with Al in solution 2 o 3 and SiO 2 reaction to produce hydrated garnet, the so-called secondary reaction, resulting in a part of the Al in solution 2 o 3 re-enter red mud, resulting in Al 2 o 3 Loss

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  • Process for preparing alumina by two-component sintering method

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Embodiment 1

[0022] The two-component sintering alumina preparation process of the present invention is as follows:

[0023] The chemical weight percent of the bauxite used is: SiO 2 7.19, Fe 2 o 3 5.25, Al 2 o 3 67.82, CaO 8.50, Na 2 O 0.6,K 2 O 0.55, TiO 2 2.91, other 7.18, ore burning reduction 13.55%;

[0024] The main phase weight percentage of bauxite used is: diaspore 78.5, anatase 2.8, kaolinite 3.5, quartz 1.3, hematite 4.2, others 9.7;

[0025] The slurry preparation is based on the weight ratio of bauxite and industrial alkali powder of 1:0.30, adding bauxite and industrial alkali powder to the raw material mill, and adding 1.39m of high-concentration evaporated carbon mother liquor per ton of bauxite 3 , The slurry is ground to a residue of 12% on a 120 mesh sieve.

[0026] The above slurry is sent to the rotary kiln to burn the two-component clinker. The firing temperature is 1160-1180°C. The residence time of the material in the clinker kiln is 2.0 hours. The wei...

Embodiment 2

[0032] The two-component sintering alumina preparation process of the present invention is as follows:

[0033] The chemical weight percent of the bauxite used is: SiO 2 9.19, Fe 2 o 3 5.05, Al 2 o 3 65.82, CaO 8.30, Na 2 O 0.6,K 2 O 0.54, TiO 2 2.89, other 7.18, ore burning reduced by 14%;

[0034] The slurry preparation is based on the weight ratio of bauxite and industrial alkali powder of 1:0.31, adding bauxite and industrial alkali powder to the raw material mill, and adding 1.40m of high-concentration evaporated carbon mother liquor per ton of bauxite 3 , The slurry is ground to 10% on the 120 mesh sieve.

[0035] The above slurry is sent to the rotary kiln to burn the two-component clinker. The firing temperature is 1150-1160°C. The residence time of the material in the clinker kiln is 2.5 hours. The weight percentage of the obtained two-component clinker is: SiO 2 9.88, Fe 2 o 3 3.96, Al 2 o 3 43.50, CaO 3.00, Na 2 O 34.29, K 2 O 2.20, Na 2 o S ...

Embodiment 3

[0041] The two-component sintering alumina preparation process of the present invention is as follows:

[0042] The slurry preparation is based on the weight ratio of bauxite and industrial alkali powder of 1:0.29, adding bauxite and industrial alkali powder to the raw material mill, and adding 1.44m of high-concentration evaporated carbon fraction mother liquor per ton of bauxite 3 , The slurry is ground to a residue of 14% on a 120 mesh sieve.

[0043] The above slurry is sent to the rotary kiln to burn the two-component clinker, the firing temperature is 1180-1200°C, and the residence time of the material in the clinker kiln is 2 hours to obtain the two-component clinker;

[0044] The two-component clinker is dissolved in the dissolution wet mill together with the adjustment solution, and the addition amount of the adjustment solution is 4.5m 3 / t-clinker, the dissolution temperature is 77-79°C;

[0045] After the clinker of the two components is dissolved, the liquid-sol...

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Abstract

The invention discloses a double-component sintering process to produce Alumina. Its technics include: batching, slime preparation, chamotte agglomeration, chamotte stripping, green liquor desilication and filtering to obtain aluminium hydroxide, after roasting to get Alumina. Its characters lie in that the Alumina is produced by bauxite and industrial ground caustic, two component batching. Compared with old high alumina silica ratio sintering process, grog reduced ratio reduces from 3.3-3.6 to 2.4-2.7, grog alumina grade improves from 38-40 percent to 45-50 percent, energy consumption reduces from 1,400-1,500kgbm to 1,100-1,300kgbm. Grog red mud yield reduces from 38 percent to 14 percent. The invention realizes target of little waste residue, high productivity, low cost and energy consumption and adapts to industrialized application.

Description

technical field [0001] The invention relates to a new process for preparing alumina, which is used for preparing alumina by sintering. Background technique [0002] Bauxite is currently the most important raw material in alumina production. It is divided into gibbsite type, boehmite type, diaspore type and various mixed types. Its properties and mineral composition determine alumina Currently, the production methods of alumina in the world mainly include Bayer method, sintering method and combined method. Most foreign alumina manufacturers use the Bayer method to produce alumina because they have gibbsite-type bauxite; my country is rich in bauxite resources, but most of the bauxite that has been discovered is diaspore type , There are very few gibbsite-type bauxites. Therefore, most domestic alumina production enterprises use the alkali-lime sintering method or the combined method to produce alumina. [0003] After years of research and industrial production practice since...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F7/06C01F7/08C01F7/30
Inventor 刘昌俊侯健贾海龙李文成王平升温金德任明林
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