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Bauxite iron-removing technology

A bauxite and process technology, applied in the direction of aluminum silicate, aluminum sulfate, ferric sulfate, etc., can solve the problems of high aluminum loss and long time consumption, and achieve the effect of small loss, short time consumption and high efficiency

Inactive Publication Date: 2011-08-17
SHANDONG SANFENG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been found through experiments that when iron and other active metal elements are removed in this scheme, the loss of aluminum is also high, and the process takes a relatively long time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The bauxite iron removal process is carried out according to the following steps:

[0014] a. Use 500 grams of 10% dilute hydrochloric acid, and 100 grams of bauxite powder passed through a 60-mesh sieve according to the liquid-solid mass ratio of 5:1, add it to the slurry tank, and use the reaction exhaust to preheat the slurry to about 80 ° C. Stir for about 10 minutes, the dilute hydrochloric acid will quickly dissolve the iron oxide, and the iron oxide will release Fe 3+ Ions, the slurry is slightly yellow;

[0015] b. After fully reacting, filter through a 60-mesh sieve to separate the solid from the liquid. The separated solid is stirred and washed with clean water for about 5 minutes, and then filtered to separate the bauxite after iron removal. Put it into the reaction kettle to react with concentrated sulfuric acid under pressure; return the filtrate to the slurry tank, and recycle it to remove iron. When EDTA titration removes Fe in sulfuric acid solution 3...

Embodiment 2

[0018] 100 grams of bauxite powder 100 grams through a 60 mesh sieve and 300 grams of dilute sulfuric acid with a mass fraction of 12%, according to the mass ratio of dilute sulfuric acid: bauxite powder=3: 1, mixed and stirred for 15 minutes at 80 ° C, and then Solid-liquid separation, the separated solid is washed with water and then press-filtered again, and the obtained solid is bauxite after iron removal.

[0019] After testing, the bauxite powder weighed 100 grams before acid treatment, including 45.94 grams of alumina and 2.66 grams of iron oxide. After the iron removal process, the weight of bauxite powder was 94.8 grams, 45.19 grams of alumina, and 121 grams of iron oxide. . It is calculated that alumina loss is 1.63%, and iron oxide is removed by 54.51%.

Embodiment 3

[0021] The bauxite powder 100 grams that crossed 60 mesh sieves and mass fraction are 400 grams of dilute sulfuric acid of 12%, according to mass ratio dilute sulfuric acid: bauxite powder=4: 1, mix and stir reaction 15min at 90 ℃, then Solid-liquid separation, the separated solid is washed with water and then press-filtered again, and the obtained solid is bauxite after iron removal.

[0022] After testing, the bauxite powder weighed 100 grams before acid treatment, including 45.94 grams of alumina and 2.66 grams of iron oxide. After the iron removal process, the weight of bauxite powder was 94.5 grams, 44.69 grams of alumina, and 1.37 grams of iron oxide. . It is calculated that the loss of alumina is 2.72%, and 48.50% of iron oxide is removed.

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PUM

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Abstract

The invention discloses a bauxite iron-removing technology and relates to an iron-removing method in the production of aluminum sulfate. The bauxite iron-removing technology is characterized by including the steps as follows: mixing bauxite powder passing through a 60-mesh screen with diluted acid with a mass fraction of 10-15% at the temperature of 80-90 DEG C according to the mass ratio of the diluted acid to the bauxite powder which is equal to 2-5:1 and reacting for 10-20min; then conducting solid-liquid separation; and washing separated solid with clear water and then conducting the solid-liquid separation again, and obtaining a solid, namely the bauxite after iron removal. Compared with the prior art, the bauxite iron-removing technology has the advantages as follows: the loss of aluminum is about 1.63% so that the loss amount is litter; the removal rate of iron is up to 54.51%, so that the iron-removing effect is obvious and the industrial requirements can be met; and simultaneously, the whole bauxite iron-removing process only needs 10-15min so that the expending time is short, and the iron-removing efficiency is high.

Description

technical field [0001] The invention relates to a bauxite iron removal process, which belongs to the field of sulfate production, and specifically relates to an iron removal method in the production of aluminum sulfate. Background technique [0002] The production process of aluminum sulfate mostly uses raw materials such as bauxite, kaolin, clay, and coal gangue. After leaching with sulfuric acid, the leachate is obtained, and then the aluminum sulfate solution is obtained after impurity removal. The main impurity affecting the quality of aluminum sulfate is iron ion. Many manufacturers at home and abroad are committed to research on the removal of iron ions in aluminum sulfate. For example, the oxidation precipitation method is used: using hydrogen peroxide (H 2 o 2 ), potassium persulfate (K 2 S 2 o 8 ), after oxidizing divalent iron to ferric iron, limestone is used as a precipitant to remove trivalent iron ions, resulting in the introduction of a large amount of c...

Claims

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Application Information

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IPC IPC(8): C01B33/26C01G49/14C01F7/74
Inventor 宋军孙海洋
Owner SHANDONG SANFENG GROUP