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High-purity barium metaphosphate and preparation method thereof

A technology of pure barium metaphosphate and barium carbonate, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of increased production cost, complex production process, and high production cost of barium metaphosphate, and achieves small investment in equipment, The effect of simple process

Pending Publication Date: 2022-01-04
GUIZHOU REDSTAR DEVING
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Problems solved by technology

[0004] Because the first two preparation methods of barium metaphosphate have high production cost, unstable yield and product quality, and complicated production process, they are not suitable for large-scale application
Compared with the first two methods, the third preparation method of barium metaphosphate has the advantages of simple production process and low product impurity content. However, in the process of converting barium hydrogen phosphate into barium metaphosphate, the method adopts a centrifugal spray drying tower , which undoubtedly increases the production cost
Moreover, in the third method, the waste liquid is not effectively recycled, which is not only uneconomical, but also unfriendly to the environment

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  • High-purity barium metaphosphate and preparation method thereof

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preparation example Construction

[0028] Concrete, the preparation method of high-purity barium metaphosphate of the present invention comprises:

[0029] (1) add phosphoric acid solution as bottom liquid in reactor, and heat;

[0030] (2) get phosphoric acid solution in addition, make it and barium carbonate slowly add in the described reactor in proportion, heat, stir, obtain solid and filtrate through solid-liquid separation after reaction finishes;

[0031] (3) adding the filtrate to the reactor as the bottom liquid for recycling, drying the solid, and then washing it with water after burning to constant weight;

[0032] (4) drying again to obtain high-purity barium metaphosphate.

[0033] The preparation method of the high-purity barium metaphosphate of the present invention has the advantages of simple technological process, small equipment investment, economy and environmental protection, and conforms to the concept of green chemistry. It has been proved by practice that the present invention can obta...

Embodiment 1

[0068] Concentrated phosphoric acid (85%, 14.6mol / L, Fe content is 1.2ppm) 3420mL is fixed to 6000mL (solution concentration is 8.32mol / L), the reaction vessel is placed in 80 ℃ constant temperature water bath, pre-charged to the reaction vessel Add 2400mL of phosphoric acid solution (40%), after the temperature of phosphoric acid solution in the reaction vessel rises to 80°C, use a constant flow pump to add the remaining 3600mL of phosphoric acid solution while adding 3000g of high-purity barium carbonate to carry out the synthesis reaction. The added phosphoric acid and barium carbonate The molar ratio was 29.9:15.20, the two were fed simultaneously at a rate of about 120mL:100g, and the stirring was started at 500r / min at the same time. After the feeding was completed, the reaction was continued for 1h, and centrifuged to obtain a crystal wet weight of 4380g, a filtrate of 4320mL, and an acidity of 4.15mol / L.

[0069] After the crystals were dried at 100°C, they were burned ...

Embodiment 2

[0071] Recover 4300ml of the filtrate reacted in Example 1 (phosphoric acid concentration 2.96mol / L, acidity 4.15mol / L), add it as the reaction bottom liquid in the reaction vessel, place the reaction vessel in a constant temperature water bath at 85°C, and wait for the reaction After the temperature of the solution in the container rises to 85°C, use a constant flow pump to add 2070mL of concentrated phosphoric acid (85%, AR) and 3000g of high-purity barium carbonate to carry out the synthesis reaction at the same time. 500r / min, the reaction was continued for 1.5h after feeding, and centrifuged to obtain a crystal wet weight of 5500g, a filtrate of 4600mL, and an acidity of 4.02mol / L.

[0072] After the crystals were dried at 100°C, they were burned in a high-temperature furnace at 580°C for 6 hours. Then wash the burned sample once: the ratio of material to water is 1:2, the washing temperature is 60°C, the washing time is 1h, and after washing with water, dry it at 100°C f...

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Abstract

The invention belongs to the technical field of inorganic phosphorus chemical industry, and particularly relates to high-purity barium metaphosphate and a preparation method thereof. The preparation method of the high-purity barium metaphosphate comprises the following steps: (1) adding a phosphoric acid solution as a base solution into a reactor, and conducting heating; (2) taking another phosphoric acid solution, slowly adding the phosphoric acid solution and barium carbonate into the reactor in proportion, conducting heating, conducting stirring, and carrying out solid-liquid separation after the reaction is finished to obtain a solid and filtrate; (3) adding the filtrate into the reactor to be recycled as a base solution, drying the solid, conducting firing to constant weight, and conducting washing with water; and (4) conducting drying again to obtain the high-purity barium metaphosphate. The preparation method of the high-purity barium metaphosphate is simple in technological process, low in equipment investment, economical and environment-friendly, and conforms to the green chemistry concept.

Description

technical field [0001] The invention belongs to the technical field of inorganic phosphorus chemical industry, and in particular relates to a high-purity barium metaphosphate and a preparation method thereof. Background technique [0002] Metaphosphate is the most stable phosphate among dibasic phosphates, and is the basic raw material for making phosphate glass. Due to its excellent light transmission properties, high-purity metaphosphate can not only be used as an important raw material for laser glass in high-power lasers, but also an important raw material for some advanced optical equipment such as camera lenses, high-definition cameras, smartphone lenses and mobile phone panel substrates. Due to the existence of transition metals Fe, Co, Ni, etc., metaphosphate glass will produce strong absorption in the near ultraviolet to infrared region, which will affect the optical properties of the glass. Therefore, the preparation of high-purity metaphosphate raw materials has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/44
CPCC01B25/44C01P2006/80
Inventor 梁启波万洋曾开文
Owner GUIZHOU REDSTAR DEVING
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