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Method for preparing boric acid from crude boron stone through electroosmosis electrolytic method

An electrolysis method and ore technology, applied in the electrolysis process, electrolysis components, cells, etc., can solve the problems of difficult sulfate content, high ore grade requirements, and increased processing costs, and achieve wide applicability of raw materials, good economic benefits, The effect of material cost reduction

Inactive Publication Date: 2012-08-22
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the process is simple, this method has high requirements on the grade of the ore, which needs to be greater than 19%. The content of metal ions and sulfate radicals in the product is difficult to control, and the purity of boric acid is not high.
The second is a two-step method, that is, using borax to add sulfuric acid to produce boric acid. This process can effectively control the content of metal ions, but the content of sulfate radicals is still difficult to control, which affects product quality and increases processing costs.

Method used

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  • Method for preparing boric acid from crude boron stone through electroosmosis electrolytic method
  • Method for preparing boric acid from crude boron stone through electroosmosis electrolytic method

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Embodiment 1

[0026] In this embodiment, boron ore with a boron content ≥ 9% is used. After roasting at a temperature of 600° C., it is crushed and ground into ore powder with a particle size ≥ 60 mesh. Configure 10% caustic soda solution, put 400Kg of ore powder and 500Kg of caustic soda solution into the carbonization furnace, keep the temperature of the carbonization furnace at 120°C, and the pressure at 0.6MPa, and react for 7.5 hours. Filter the reacted slurry for a second time. After crystallization, the borax content in the remaining filtrate is about 5%, and put it into the anode area of ​​the electroosmotic electrolysis device, and put 6% caustic soda solution in the cathode area. The distance between the parallel electrolytic cell end plate and the ion selective permeable membrane is 2 mm, the temperature of the yin and yang areas is 50 ° C, the electrolytic DC voltage is 3.0 V, and the electrolytic reaction time is 4 hours. The detection purity reaches 99.5%.

Embodiment 2

[0028] In this embodiment, boron ore with a boron content ≥ 12% is used. After roasting at a temperature of 700° C., it is crushed and ground into ore powder with a particle size ≥ 60 mesh. Configure 20% caustic soda solution, put 1000Kg of ore powder and 1300Kg of caustic soda solution into the carbonization furnace, keep the temperature of the carbonization furnace at 130°C, and the pressure at 0.6MPa, and react for 10 hours. Filter the reacted slurry for a second time. After crystallization, the borax content in the remaining filtrate is about 12%, and put it into the anode area of ​​the electroosmotic electrolysis device, and put 9% caustic soda solution in the cathode area, and the anode and anode chambers and the cations selectively permeate the membrane phase The distance between the parallel electrolytic cell end plate and the ion selective permeable membrane is 70 mm, the temperature of the yin and yang areas is 60 ° C, the electrolytic DC voltage is 4.3 V, and the ele...

Embodiment 3

[0030] In this embodiment, boron ore with a boron content ≥ 9% is used. After roasting at a temperature of 700° C., it is crushed and ground into ore powder with a particle size ≥ 60 mesh. Configure 30% caustic soda solution, put 2000Kg of ore powder and 2800Kg of caustic soda solution into the carbonization furnace, keep the temperature of the carbonization furnace at 130°C, and the pressure at 0.7MPa, and react for 10 hours. Filter the reacted slurry for a second time. After crystallization, the borax content in the remaining filtrate is about 16%. Put it into the anode area of ​​the electroosmotic electrolysis device, and put 20% caustic soda solution in the cathode area. The distance between the parallel electrolytic cell end plate and the ion selective permeable membrane is 140mm, the temperature of the anodic and anode areas is 70°C, the electrolytic DC voltage is 5.5V, and the electrolytic reaction time is 10 hours. The detection purity reached 99.7%.

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Abstract

The invention provides a method for preparing boric acid from crude boron stones through an electroosmosis electrolytic method, which includes roasting and breaking crude boron stones and conducting carbon solution and electrolysis to obtain the boric acid. The method is wide in raw material adaptability, low in material cost and capable of simultaneously and effectively controlling content of impurity metal ions and sulfate ions, and has good economical benefits. The ore grade can be expanded to be larger than 9%, and sulfuric acid does not need to be added.

Description

technical field [0001] The invention belongs to the field of boron ore processing, in particular to a method for preparing boric acid from boron ore by electroosmotic electrolysis. Background technique [0002] At present, there are two kinds of techniques for producing boric acid from boron ore (comprising boronite and boronite ore). One is a one-step method, that is, the direct reaction of sulfuric acid and boron ore is used to produce boric acid. The process of producing boric acid and magnesium sulfate monohydrate" mentioned using this process to produce boric acid. The process is that the boron ore is roasted, matured and pulverized, then dissolved with acid, filtered, crystallized, centrifuged, washed and dried. Although this method has a simple process, it has high requirements on the grade of the ore, which needs to be greater than 19%. The content of metal ions and sulfate radicals in the product is difficult to control, and the purity of boric acid is not high. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00C25B9/10C25B9/23
Inventor 邹恩义李静静林军连志荣张金鹤
Owner DALIAN JIAOTONG UNIVERSITY
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