Method for preparing boric acid and sodium nitrate by processing native borax with nitric acid

A technology of sodium nitrate and borax ore, which is applied in the preparation of alkali metal nitrates and boron oxides, etc., can solve the problems of high energy consumption, achieve the effects of reducing energy consumption, reducing raw material costs, and saving equipment investment

Active Publication Date: 2014-04-09
NANYANG ORIENTAL APPL CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The above two patent technologies also have the problem that the preparation of sodium nitrate needs to evaporate the mother liquor of boric acid, and the evaporation process consumes a lot of energy.

Method used

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  • Method for preparing boric acid and sodium nitrate by processing native borax with nitric acid
  • Method for preparing boric acid and sodium nitrate by processing native borax with nitric acid
  • Method for preparing boric acid and sodium nitrate by processing native borax with nitric acid

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Embodiment 1

[0039] Such as image 3 Shown the present invention prepares the method for boric acid and sodium nitrate with nitric acid treatment borax mine, prepares by following steps:

[0040] Mix 1000kg of borax ore (containing 77% of borax decahydrate) and 5000L of boric acid mother liquor (co-saturated solution of boric acid and sodium nitrate at 20°C) in a immersion tank, heat to 90°C under stirring, and then time Heat preservation and leaching for 30 minutes. After leaching, pump the ore slurry into a filter press for filtration to obtain borax solution and boron mud. The borax solution is filtered twice, and the borax solution filtered twice is sent to the neutralization reactor. The temperature of the borax solution is controlled at 60°C, and 600L of nitric acid with a concentration of 45% is added under stirring conditions to control the end point of the neutralization reaction. The pH value of the reaction is 1.5, and then the neutralized liquid is sent to a cooling crystalliz...

Embodiment 2

[0043] Such as image 3 Shown the present invention prepares the method for boric acid and sodium nitrate with nitric acid treatment borax mine, prepares by following steps:

[0044] Mix 1000kg borax ore (containing 60% borax decahydrate) and 5500L boric acid mother liquor (co-saturated solution of boric acid and sodium nitrate at 23°C) in a immersion tank, heat to 93°C under stirring, and then time Heat preservation and leaching for 50 minutes. After leaching, pump the ore slurry into a filter press to filter to obtain borax solution and boron mud. Filter the borax solution twice, and send the second-filtered borax solution into the neutralization reactor, control the temperature of the borax solution at 70°C, add 280L of nitric acid with a concentration of 60% under stirring conditions, and control the end point of the neutralization reaction The pH value of the reaction is 3.5, and then the neutralized liquid is sent to a cooling crystallizer for crystallization. The crys...

Embodiment 3

[0047] Such as image 3 Shown the present invention prepares the method for boric acid and sodium nitrate with nitric acid treatment borax mine, prepares by following steps:

[0048] Mix 1000kg borax ore (containing 57% borax decahydrate) and 6000L boric acid mother liquor (co-saturated solution of boric acid and sodium nitrate at 25°C) in a immersion tank, heat to 95°C under stirring, and then time Heat preservation and leaching for 60 minutes. After leaching, pump the ore slurry into a filter press to filter to obtain borax solution and boron mud. Filter the borax solution twice, and send the second-filtered borax solution into the neutralization reactor, control the temperature of the borax solution at 85°C, add 290L of nitric acid with a concentration of 65% under stirring conditions, and control the end point of the neutralization reaction The pH value of the reaction is 2.0, and then the neutralized liquid is sent to a cooling crystallizer for crystallization. The crys...

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Abstract

A disclosed method for preparing boric acid and sodium nitrate by processing native borax with nitric acid comprises the following steps: (1) taking native borax as a raw material, preparing a material in a leaching tank by employing native borax and a circulation boric acid mother solution according to a mass volume ratio of 1:5-1:6; (2) with stirring, controlling the leaching temperature at 85-100 DEG C and the leaching time at 30-60 min; (3) filtering the slurry finishing leaching to obtain boron mud and a borax solution; (4) sending the borax solution into a neutralizing reaction container, adding nitric acid for neutralizing, so as to enable borax therein to convert into boric acid and sodium nitrite; (5) cooling the neutralized solution, crystallizing to prepare a mixed crystal slurry of boric acid and sodium nitrite; (6) putting the mixed crystal slurry of boric acid and sodium nitrite in a sodium-boron separator, performing gravity separation, dewatering, washing and drying to prepare boric acid product and sodium nitrite product; and (7) enabling the boric acid mother solution to be cycled and used for leaching material-preparing of raw native borax. The reaction is stable and reliable, the raw material cost is low, and the boric acid mother solution does not need evaporating, so that the production cost of boric acid is reduced.

Description

technical field [0001] The invention belongs to the field of inorganic chemical industry, and in particular relates to a method for preparing boric acid and sodium nitrate by treating borax ore with nitric acid. Background technique [0002] There are one-step and two-step methods for producing industrial boric acid in my country. The one-step method is a method of directly producing boric acid by treating boron-containing compounds with sulfuric acid or hydrochloric acid, and the mainstream process is the sulfuric acid method. The sulfuric acid method also includes the magnesium sulfate boronite method, the sodium borate limestone method, the borax sulfate method, and the like. Others such as the hydrochloric acid method, the ammonium bicarbonate method, and the sodium polyborate method have not been industrialized although there have been reports. The two-step method is a method for preparing industrial boric acid by reacting sulfuric acid or nitric acid with industrial ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/10C01D9/04
Inventor 肖建楠郭捷陈居玲夏娇彬胡彩华王卫东
Owner NANYANG ORIENTAL APPL CHEM RES INST
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