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Technological method for preparing boric acid, calcium carbonate and sodium nitrate by decomposing ulexite mine with nitric acid

A technology of sodium borate stone and process method, which is applied in the field of chemical engineering disciplines, can solve problems such as environmental pollution and waste of resources, and achieve the effects of low temperature, low corrosion, and easy reaction equipment

Inactive Publication Date: 2015-04-08
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process only uses the boron element in the sodium borate, and the calcium and sodium elements in it are not used as waste, which not only wastes resources but also pollutes the environment.

Method used

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  • Technological method for preparing boric acid, calcium carbonate and sodium nitrate by decomposing ulexite mine with nitric acid
  • Technological method for preparing boric acid, calcium carbonate and sodium nitrate by decomposing ulexite mine with nitric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Composition 250kg into B 2 o 3 31%, CaO11.81%, Na 2 O6.90% and Cl4.6% sodium borate ore is ground on a ball mill for 0.5h, and the ore powder screened by a 100-mesh standard sieve is placed in a 2m 3 In the acid hydrolysis reaction tank, add 0.77m 3 Boric acid washing water, 0.40m 3 Sodium nitrate mother liquor and 0.080m 3 68% concentrated nitric acid, acid hydrolysis reaction at liquid-solid ratio 5:1 and 70°C for 40 minutes, cooled to 30°C to crystallize, and separated to obtain 82.6kg of boric acid and 1.1m of boric acid mother liquor 3 ;At 30°C, add 56kg of sodium carbonate to the boric acid mother liquor, precipitate for 30 minutes, and obtain 51.1kg of spherical calcium carbonate; evaporate the mother liquor of separated calcium carbonate to 40 Baume degrees, cool down to 40°C for crystallization, and separate 90kg of nitric acid by flotation Sodium product, 13.7kg crude boric acid and 0.40m 3 Mother liquor, crude boric acid and mother liquor return to acid...

Embodiment 2

[0024] Composition 240kg into B 2 o 3 33%, CaO12.01%, Na 2 O7.50% and Cl5.60% sodium borate ore was ground on a ball mill for 1.5 hours, and the ore powder sieved by a 200-mesh standard sieve was placed in a 2m 3 In the acid hydrolysis reaction tank, add 0.87m 3 Boric acid washing water, 0.50m 3 Sodium nitrate mother liquor and 0.072m 3 68% concentrated nitric acid, after acid hydrolysis reaction at liquid-solid ratio 6:1 and 50°C for 50 minutes, cool down to 30°C to crystallize and separate boric acid 87.6kg and boric acid mother liquor 1.25m 3 ;At 50°C, add 60kg of sodium carbonate to the boric acid mother liquor, precipitate for 50 minutes, and obtain 49.7kg of spherical calcium carbonate; evaporate the mother liquor of separated calcium carbonate to 45 degrees Baume, cool down to 35°C to crystallize, and flotation to separate 87.5kg Sodium nitrate product, 14.2kg crude boric acid and 0.50m 3 Mother liquor, crude boric acid and mother liquor return to acid hydrolysis ...

Embodiment 3

[0026] Composition 200kg into B 2 o 3 39.00%, CaO13.27%, Na 2 O5.61% and Cl0.60% 120-mesh sodium borate concentrate is placed in 2m 3 In the acid hydrolysis reaction tank, add 0.36m 3 Boric acid washing water, 0.35m 3 Sodium nitrate mother liquor and 0.089m 3 68% concentrated nitric acid, after acid hydrolysis at 4:1 liquid-solid ratio and 60°C for 80 minutes, cool down to 25°C to crystallize and separate boric acid 98.6kg and boric acid mother liquor 0.69m 3 ;At 40°C, add 55kg of sodium carbonate to the boric acid mother liquor, precipitate for 40 minutes, and obtain 47.1kg of spherical calcium carbonate; evaporate the mother liquor of separated calcium carbonate to 37 Baume degrees, cool down to 30°C for crystallization, and separate 102kg of nitric acid by flotation Sodium product, 12.5kg crude boric acid and 0.35m 3 Mother liquor, crude boric acid and mother liquor return to acid hydrolysis batching.

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Abstract

The invention discloses a technological method for preparing boric acid, calcium carbonate and sodium nitrate by decomposing a ulexite mine with nitric acid, and belongs to the field of chemical engineering disciplines. The method comprises the steps that the ulexite mine is used as a raw material; under the conditions that the dosage of nitric acid is 50-110% of the theoretical dosage, a liquid-to-solid ratio is (3-8):1, and a reaction temperature is 50-90 DEG C, 50-350 meshes of ulexite mine containing 20-42wt% of B2O3 is subjected to a leaching reaction for 30-120min; boric acid is separated out by crystallization when a leaching liquid is cooled to 20-40 DEG C; at 30-90 DEG C, sodium carbonate and calcium nitrate in a mother liquid of boric acid are subjected to a precipitation reaction for 20-35min; spherical calcium carbonate powder with the granularity of 0.5-50 micrometers is separated out; sodium nitrate and boric acid are separated out by the crystallization when a mother liquid of calcium carbonate is cooled to 20-40 DEG C after separated, evaporated and concentrated; sodium nitrate is separated from boric acid by a flotation method; and separated crude boric acid and the mother liquid return to a leaching procedure to be recycled. The method has the characteristics that sodium, calcium and boron in the mine can be used comprehensively, and the production cost of boric acid is lowered.

Description

technical field [0001] The invention relates to a process for preparing boric acid, calcium carbonate and sodium nitrate by decomposing sodium borate ore with nitric acid, belonging to the field of chemical engineering. Background technique [0002] Boric acid is a basic boron chemical with a wide range of uses, mainly used in ceramics, enamel, alkali-free glass fiber, high borosilicate glass, metallurgy, nuclear energy and other industries (Liu Ran et al., Materials Herald, 20(6), 2006 ). In addition, boric acid can also be used as a raw material for other borides, such as boron carbide, boron nitride, zinc borate, calcium borate, borax, borate, etc. These boron derivatives are widely used in abrasives, high-temperature ceramics, lubricating oil, resistance fuel, high-energy fuel, polymer composite engineering materials, medicine, aerospace and other fields (Nizamettin Demirkiran, Hydrometallurgy, (95), 2009). [0003] At present, at home and abroad, natural boron ore res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/10C01F11/18C01D9/02
Inventor 仲剑初朱军王洪志
Owner DALIAN UNIV OF TECH
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