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Method for preparing boric acid from boron ore

A technology of boric acid and boron ore, which is applied in the direction of chemical instruments and methods, boron compounds, boron oxide compounds, etc., can solve the problems of poor operability, inability to recycle, and large dosage, so as to improve gloss and quality, reduce Extraction cost, the effect of not polluting the environment

Inactive Publication Date: 2019-01-01
衡阳市大宇锌业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN200910058548.0 discloses an industrial waste adsorbent used for crystallization control and whitening control method of boric acid production, which adopts activated carbon adsorbent to adsorb iron ions, but the decolorization cost of activated carbon adsorption is high, the consumption is large, and it cannot be recycled , the operability is not strong, so that the industrial application is limited

Method used

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  • Method for preparing boric acid from boron ore
  • Method for preparing boric acid from boron ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing boric acid from boron ore, comprising the following:

[0026] (1) Ore crushing: Use an ore crusher to crush the ore to a crushing degree of 300 mesh, add 70% sulfuric acid to the mineral powder according to the ratio of material to liquid of 1:3, add sulfuric acid while stirring, and raise the temperature. Acid hydrolysis at 90°C for 1.5 hours, the pH of acid hydrolysis is 4; the first filtration is performed after acid hydrolysis, the filtrate after the first filtration enters the next process, and the rinse solution formed after the filter residue is washed with water is returned to the acid hydrolysis solution further acid hydrolysis;

[0027] (2) First-stage purification: Add 2 times the volume of hydrogen peroxide and 30% sodium sulfide to the filtrate of step (1), and react at a temperature of 90°C for 12 minutes to make the manganese, arsenic and Part of the aluminum ions and iron ions are precipitated; after the first level of purificatio...

Embodiment 2

[0034] A method for preparing boric acid from boron ore, comprising the following:

[0035] (1) Ore crushing: Use an ore crusher to crush the ore to a crushing degree of 200 mesh, add 80% sulfuric acid to the mineral powder according to the ratio of material to liquid of 1:2, add sulfuric acid while stirring, and raise the temperature. Acid hydrolysis at 100°C for 1 hour, the pH of the acid hydrolysis is 5; after the acid hydrolysis, the first filtration is carried out, and the filtrate after the first filtration enters the next process, and the washing liquid formed after the filter residue is washed with water is returned to the acid hydrolysis solution for further Acid hydrolysis;

[0036] (2) First-stage purification: Add 3 times the volume of hydrogen peroxide and 40% sodium sulfide to the filtrate of step (1), and react at a temperature of 100°C for 10 minutes to make the manganese, arsenic and Part of the aluminum ions and iron ions are precipitated; after the first le...

Embodiment 3

[0043] A method for preparing boric acid from boron ore, comprising the following:

[0044] (1) Ore crushing: use an ore crusher to crush the ore to a degree of 250 mesh, add 75% sulfuric acid to the ore powder according to the ratio of material to liquid of 1:3, add sulfuric acid while stirring, increase the temperature, and the temperature is Acidolysis at 95°C for 1 hour, the pH of acidolysis is 4; after acidolysis, the first filtration is performed, the filtrate after the first filtration enters the next process, and the rinsing solution formed after the filter residue is rinsed with water is returned to the acidolysis solution for further acidolysis;

[0045] (2) First-stage purification: add 2 times the volume of hydrogen peroxide and sodium sulfide with a concentration of 35% to the filtrate in step (1), and react at a temperature of 95 ° C for 10 minutes to make manganese, arsenic and arsenic in the filtrate. Part of the aluminum ions and iron ions are precipitated; t...

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Abstract

The invention discloses a method for preparing boric acid from boron ore. The method comprises the following steps: ore smashing, acidolysis, first filtering, first purification, secondary filtering,concentrating, crystallizing, first centrifugation, flotation separation, secondary centrifugation and freeze-drying, thereby obtaining the boric acid product. The method is characterized in that thesecondary purification is added between the secondary filtering and the concentrating; an organic complexing agent is adopted for complexing iron ions and aluminum ions during the secondary purification; the organic complexing agent is used for precipitating iron ions and aluminum ions, so as to form an iron-organic complexing sediment and an aluminum-organic complexing sediment. The method can beused for effectively removing iron ions, is capable of eliminating the influence of iron ions on the glossiness of the finished product of boric acid and has simple process, high operability, high cyclic utilization rate of filtrate, low cost and high extraction ratio of boric acid.

Description

technical field [0001] The invention relates to the technical field of boric acid extraction, in particular to a method for preparing boric acid from boron ore. Background technique [0002] The method of domestic production of boric acid mainly adopts the sulfuric acid method to decompose magnesium ore to produce boric acid. The main process is crushing boron magnesium ore→adding sulfuric acid and water to acidify the mineral powder→filtering to remove the filter residue→cooling and crystallization→centrifuging to discharge the mother liquor and harvesting wet boric acid →washing with water→centrifugal throwing dry→dry to obtain boric acid product. The mother liquor is finally discharged. The mother liquor may contain impurities such as heavy metals and concentrated acids. Direct discharge will cause environmental pollution, and will cause a large loss of boron, reducing the extraction rate of boric acid. [0003] During the production of boric acid, since boron ore contai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/10
CPCC01B35/1063
Inventor 颜昌军
Owner 衡阳市大宇锌业有限公司
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