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Manufacture of boron-containing compound using cotton balls hydrothermal method and its comprehensive utilization

A technology of soda calcium stone and boron compound, which is applied in the direction of boron oxide compound and borate, and can solve the problem of difficulty in producing pure borate calcium salt

Inactive Publication Date: 2006-10-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The common shortcoming of above-mentioned two kinds of technologies is that when using sodium borate ore powder as raw material, it is difficult to produce pure borate calcium salt due to the existence of impurities.

Method used

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  • Manufacture of boron-containing compound using cotton balls hydrothermal method and its comprehensive utilization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In an effective volume of 6 meters 3 In a pressure reaction tank equipped with a steam jacket, add 2 meters of boron-calcium washing solution and 2 meters of clear water 3 , start stirring, and add more than 95% of the 180-mesh sodium borate ore powder (containing B 2 o 3 3.8% CaO12.23% Na 2 (06.77%) 1000kg, the pipeline valve of going in and out of the reaction tank is closed, the feeding hole cover is sealed tightly, and steam is heated and boosted. When the pressure in the tank reaches 0.4Mpa, the temperature is 150°C. Keep the pressure and temperature in the tank constant, decompose for 6 hours, then feed the steam of 0.6Mpa to press the material in the tank to the filter press for liquid-solid separation, keep the inlet pressure of the filter press at 0.4Mpa, and the filtrate (polyboric acid Sodium salt solution) is collected in polyborate storage tank, until no filtrate flows out, obtains filtrate 4.03 meters 3 , specific gravity 1.06, component B 2 o 3 45g / ...

Embodiment 2

[0045] In an effective volume of 6M 3 In a pressure reaction tank equipped with a steam heating jacket, add boron-calcium washing solution 2.2M 3 , clean water 2.2M 3 . Start stirring, add more than 95% through 180 mesh clinoborite ore powder (containing B 2 o 3 44.13% CaO 14.7% Na 2 (07.86%) 1000kg, the pipeline valve of going in and out of the reaction tank is closed, the feeding hole cover is sealed tightly, and steam is heated and pressurized. When the pressure in the tank reaches 0.9Mpa, the temperature is 180°C. Keep the pressure and temperature in the tank constant and decompose for 10 hours. Then slowly open the discharge valve, press the material in the tank to the filter press for liquid-solid separation, keep the inlet pressure of the filter press at 0.4Mpa, when the pressure in the tank drops to 0.4Mpa, feed 0.6Mpa steam , continue to press the material in the tank to the filter press until the material in the tank is exhausted and the filter press emits ste...

Embodiment 3

[0047] In a volume of 6M 3 In the reaction tank with stirring, pump into the sodium polyborate solution 4.03m that obtains by example 1 3 , start stirring, drop into 127.7kg of slaked lime powder containing CaO72%, react at room temperature, react for 5 hours, stop the reaction at PH=10.5, pump the slurry to the filter press, keep the pressure before the machine at 0.4Mpa, and the filtrate flows to metaboric acid Sodium dilute liquid storage tank, after the filtrate drips out, use 0.3m 3 The filter cake is washed with water, and the washing liquid also flows into the dilute liquid tank. Finally, dry the filter cake with 0.4Mpa air until no water drops flow out. Unload the filter cake to obtain 395kg containing B 2 o 3 28.95% CaO2 3.28% wet filter cake, the wet filter cake is sent to the drying process, dried with a hollow paddle agitating dryer, keeping the material at 130°C, and staying for 2 hours to obtain B-containing 2 o3 42.46% CaO3 4.07% Na 2 O0.18% calcium metabo...

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Abstract

The invention provides a boron-containing compound prepared by ulexite hydrothermal method and the synthetic utilization thereof. And the raw material is 80-200 mesh ulexite or probertite powder containing B2O3 >=37.5 wt%, which is prepared into calcium borate product and sodium polyborate solution containing B2O3 >=40wt% and Na2O >=0.5wt%, meeting alkali free glass and boron-containing raw material requirements; synthetically utilizing the sodium polyborate solution, evaporating and concentrating, cooling and crystallizing without adding in sodium- containing alkali or salt, so as to be able to prepare borax product; adding less sulphuric acid into borax mother liquor after crystallization and separation processing to be able to prepare boric acid; adding CaO or Ca(OH)2 into the borax mother liquor or sodium-containing polyborate with borax to be able to prepare purer calcium metaborate and simultaneously sodium metaborate by-product.

Description

technical field [0001] The invention relates to a hydrothermal method for producing calcium borate, borax, boric acid and sodium metaborate by comprehensively utilizing boronite in the field of chemical industry. Background technique [0002] Soda limestone (Na 2 O 2CaO 5B 2 O3) can be directly used in glass industry and ceramic industry as boron-containing raw material, but due to containing Na 2 O, which limits the scope of its direct use. [0003] As an important raw material for the manufacture of boric acid and borax, soda limestone can be decomposed with sulfuric acid to obtain boric acid according to the following reaction: [0004] <chemistry num="001"> <chem file="200610046666_cml001.xml" / > < / chemistry> (n=10 or 16) [0005] Borax can be prepared according to the following reaction: [0006] <chemistry num="002"> <chem file="200610046666_cml002.xml" / > < / chemistry> [0007] Known by above-mentioned reaction formula, a...

Claims

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Application Information

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IPC IPC(8): C01B35/12C01B35/10
Inventor 胡德生仲剑初王斐
Owner DALIAN UNIV OF TECH
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