Background and overview[1][2]
Ba(PO3)2=295.27, white powder. Insoluble in water, slowly soluble in acid. Used in the glass, enamel and porcelain industries.
Preparation[1]
The production process principle is as follows:
1. Use barium hydroxide to produce barium hydroxide using recrystallization method and the impurities iron, copper, nickel, manganese and cobalt in barium hydroxide are all less than 0.0003%;
2. React with GR grade phosphoric acid to generate barium hydrogen phosphate, the chemical reaction formula is as follows:
3. Add deionized water to barium hydrogen phosphate to prepare a mixed solution with a solid content of 35% to 40%, and perform centrifugal spray drying to prepare barium metaphosphate.
The specific production process of the present invention is as follows:
1. Place barium hydroxide in a stainless steel reaction vessel, add deionized water and 0.01% activated carbon, stir, heat at 100-120°C to fully dissolve it until the specific gravity is 1.05-1.10, and let it stand for 16 hours or above, filter, and control the iron, copper, nickel, manganese, and cobalt to be less than 0.0003% respectively, to obtain refined barium hydroxide, and put it into another stainless steel reaction vessel.
2. While stirring, add GR grade or superior grade phosphoric acid to the refined barium hydroxide until the pH value is 4 to 5; then add refined barium hydroxide to adjust the pH value of the reactant to 9 to 11 , to obtain barium hydrogen phosphate precipitate.
3. Add deionized water to the above barium hydrogen phosphate precipitate and dilute it until the solid content of barium hydrogen phosphate is 35-40% to obtain a barium hydrogen phosphate mixed slurry.
4. Spray dry the barium hydrogen phosphate mixed slurry at high temperature in a centrifugal spray drying tower to condense it into barium metaphosphate.
During production, the temperature of the nozzle of the spray drying tower is 100~150℃, the temperature of the upper part of the spray drying tower is 100~120℃, the temperature of the middle part is 80~85℃, the temperature of the lower part is 70~75℃, the outlet temperature is 60~65℃, drying Dehydration capacity 185kg/hour.
Apply[3-5]
CN201610602873.9 relates to an inorganic material modified polyvinyl chloride, including the following raw material components: polyvinyl chloride long fiber modified polyvinyl chloride, modified polyvinyl chloride, polyvinylidene chloride, originally imported from Germany, PVC long fiber modified polyvinyl chloride is produced by the reaction of polyvinyl chloride long fiber, polyvinyl chloride, modified ferrous oxide, calcium hydroxide, barium metaphosphate and aminopropyltriethoxysilane. Vinyl chloride is produced by the reaction of copper ferrite, polyvinyl chloride, ferrous oxide, barium metaphosphate and aminopropyltriethoxysilane. Modified ferrous oxide is produced by the reaction of ferrous oxide, aminopropyltriethoxysilane and It is produced by the reaction of ethanol. Ferrous oxide is produced by the reaction of ferrous chloride, ammonia, carbon aerogel, polyvinyl alcohol and ethanol. Copper ferrite is produced by the reaction of sodium copper ethylenediaminetetraacetate, sodium iron ethylenediaminetetraacetate, water. , prepared by the reaction of ethanol and carbon aerogel. The invention has the advantages of excellent mechanical properties, hydrophobicity, self-cleaning property, flame retardancy, anti-fungal performance, aging resistance, low water vapor transmission rate, compatibility and other advantages.
CN201510404970.2 discloses a kind of glass beads used for reflective film of road traffic signs and a preparation method thereof. It is made of the following raw materials by weight: quartz sand 41-57, yellow sand 32-46, aragonite 24-38, illite 15-25, nickel oxide 3-6, potassium fluorosilicate 6-12, barium metaphosphate 5-10, pebble chips 25-40, sodalite 18-33, basic bismuth nitrate 7 -11, bone carbon powder 5-9, activated clay 10-15, gallium oxide 3-5, additives 8-14. The glass beads produced by the invention are made from quartz sand, yellow sand, aragonite, illite, barium metaphosphate, pebble chips, sodalite, bismuth subnitrate activated clay, gallium oxide and other raw materials, which not only have a high refractive index , has good reflective effect, and has excellent weather resistance, heat resistance, light resistance, oxidation resistance and durability. It fully meets the requirements for the use of reflective films for road traffic signs and is safe and reliable.
CN201511016297.1 discloses a high wet compressive strength green sand for iron castings and a preparation method thereof. It is made of the following raw materials by weight: montmorillonite 38-52, natural manganese sand 42-64, calcium silicate Slag 24-36, titanium pyroxene 19-31, granite waste 16-24, asbestos wool 10-15, calcinite 15-25, sillimanite 11-19, barium metaphosphate 8-12, polyester propylene glycol 6- 9. Polyamide epichlorohydrin resin 5-7, modifier? 510-570. The invention’s natural manganese sand, calcium silicate slag, asbestos wool, barium metaphosphate, polyester propylene glycol, polyamide epichlorohydrin resin and other raw materials can significantly improve the wet compressive strength of the molding sand on the basis of ensuring that the molding sand has good air permeability. It can effectively avoid box collapse, expansion and leakage. The molding sand prepared by the invention has the advantages of high wet compressive strength, good air permeability, good plasticity, etc., is suitable for iron castings, and has broad application prospects.
Main reference materials
[1] Dictionary of Chemical Substances
[2] [China invention, China invention authorization] CN200410073595.X Production process of barium metaphosphate
[3] CN201610602873.9 An inorganic material modified polyvinyl chloride and its preparation method
Non-foaming surfactant
[4] CN201510404970.2 Glass microbeads used for reflective films on road traffic signs and preparation method thereof
[5] CN201511016297.1 High wet compressive strength green sand for iron castings and preparation method thereof
