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A method for preparing boric acid and sodium nitrate by treating borax ore 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, saving equipment investment, and reducing raw material costs

Active Publication Date: 2016-01-06
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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  • A method for preparing boric acid and sodium nitrate by treating borax ore with nitric acid
  • A method for preparing boric acid and sodium nitrate by treating borax ore with nitric acid
  • A method for preparing boric acid and sodium nitrate by treating borax ore with nitric acid

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Effect test

Embodiment 1

[0038] like 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:

[0039] 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 crystallizer ...

Embodiment 2

[0042] like 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:

[0043] 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 crystal...

Embodiment 3

[0046] like 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:

[0047] 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 crystal...

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Abstract

The invention discloses a method for preparing boric acid and sodium nitrate by treating borax ore with nitric acid. (2) Under stirring conditions, control the soaking temperature to 85-100°C, and the soaking time to 30-60 minutes; (3) Filter the soaked slurry to obtain boron mud and Borax solution; (4) Send the borax solution into the neutralization reactor, add nitric acid for neutralization, and convert the borax into boric acid and sodium nitrate; (5) Cool and crystallize the neutralized solution to obtain boric acid and sodium nitrate Mix crystal slurry; (6), put boric acid and sodium nitrate mixed crystal slurry into sodium boron separator, and obtain boric acid and sodium nitrate products through gravity separation, dehydration, washing and drying; (7), boric acid mother liquor circulation for borax Raw ore leaching ingredients; stable and reliable reaction, low cost of raw materials, boric acid mother liquor does not need to be evaporated, reducing boric acid production costs.

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 Patents(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