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Method for producing micron-sized bismuth manganate powder

A technology of high-grade bismuth manganate and its production method, which is applied in chemical instruments and methods, manganate/permanganate, manganese compounds, etc., and can solve the difficult large-scale industrial production of bismuth manganate, preparation equipment and operators High requirements, low yield and other problems, to achieve the effect of being suitable for large-scale industrial production, reducing the cost of tail gas treatment, and wide application value

Inactive Publication Date: 2019-02-15
FIRST RARE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The product synthesized by hydrothermal method has excellent performance, but it has high requirements for preparation equipment and operators, low yield, large investment and high production cost, so it is difficult to apply to large-scale industrial production of bismuth manganate

Method used

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  • Method for producing micron-sized bismuth manganate powder
  • Method for producing micron-sized bismuth manganate powder

Examples

Experimental program
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preparation example Construction

[0015] The invention proposes a preparation method of micron bismuth manganate powder, which comprises the following steps.

[0016] S1, put Bi 2 o 3 Soluble in HNO 3 solution, forming the first mixed solution under the condition of heating in a water bath.

[0017] S2. Add ammonia water to the first mixed solution to adjust the pH to form a precipitate, age, filter and clean the precipitate Bi(OH) 3 , followed by drying.

[0018] S3, the Bi(OH) 3 with MnCO 3 Put it into a roller ball mill with a molar ratio of 1:2, mix it evenly, and then calcine it. After cooling in the furnace, you can get micron-sized bismuth manganate powder.

[0019] In some embodiments of the present invention, the heating temperature of the water bath in S1 is 60-90°C.

[0020] In some embodiments of the invention, the HNO in S1 3 The molar concentration of the solution is 1-7 mol / L.

[0021] In some embodiments of the present invention, the concentration of ammonia water in S2 is 1-13 mol / L. ...

Embodiment 1

[0028] Weigh 46.6g Bi 2 o 3 Transfer to 100ml of HNO with a molar concentration of 7mol / L 3 In the solution, stir continuously in a water bath at 60°C until it is completely dissolved to form the first mixed solution; add 6mol / L ammonia water to the first mixed solution until the pH=9, age for 1h, and wait until the Bi in the solution is completely Precipitate as Bi(OH) 3 , filter Bi(OH) 3 Precipitated and washed 3 times with distilled water, dried at 80°C; by molar ratio Bi(OH) 3 : MnCO 3 =1:2 Weigh 46.1g MnCO 3 powder, the dried Bi(OH) 3 and MnCO 3 Put the powder into a roller ball mill to mix evenly, transfer to a muffle furnace for calcination at 700°C for 2 hours, and obtain a black powder after cooling in the furnace.

Embodiment 2

[0030] Weigh 46.6g Bi 2 o 3 Transfer to 80ml of HNO with a molar concentration of 7mol / L 3 In the solution, stir continuously in a water bath at 70°C until it is completely dissolved to form the first mixed solution; add 1mol / L ammonia water to the first mixed solution until the pH=9.5, and age for 2h until the Bi in the solution is completely Precipitate as Bi(OH) 3 , filter Bi(OH) 3 Precipitated and washed 3 times with distilled water, dried at 60°C; molar ratio Bi(OH) 3 : MnCO 3 =1:2 Weigh 46.1g MnCO 3 powder, the dried Bi(OH) 3 and MnCO 3 Put the powder into a roller ball mill to mix evenly, transfer to a muffle furnace for calcination at 500°C for 10 hours, and obtain a black powder after cooling in the furnace.

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Abstract

The invention relates to a method for producing micron-sized bismuth manganate powder. The method comprises the following steps: S1, dissolving Bi2O3 in an HNO3 solution, forming a first mixed solution after heating in water bath; S2, adding ammonia water into the first mixed solution to adjust pH and form precipitates, ageing, filtering and cleaning the precipitates Bi(OH)3, and then drying; andS3, placing Bi(OH)3 and MnCO3 into a roller at a molar ratio of 1: 2 for ball-milling and mixing uniformly, calcining, and cooling together with a furnace to obtain the micron-sized bismuth manganatepowder. The method uses bismuth oxide and manganese carbonate as raw materials to prepare the micron-sized bismuth manganate powder; the prepared powder has a relatively large particle size, and has awider application value in the field of pigments; and the method reduces corrosion of exhaust gas to equipment and exhaust gas treatment costs due to no release of harmful nitrogen oxide gas during calcination, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of pigment preparation, in particular to a production method of micron bismuth manganate powder. Background technique [0002] With the continuous progress of society, the public has higher and higher environmental protection requirements for architectural pigments. Bismuth manganate (Bi 2 mn 4 o 10 ) as a new type of black pigment has simple synthetic raw materials, relatively low cost, stable optical properties, and does not contain heavy metal elements that are harmful to the environment. At the same time, bismuth manganate has a strong reflection of near-infrared light in sunlight It is beneficial to improve the reflection of sunlight on the surface of buildings and reduce the absorption of solar radiation energy by buildings, thereby helping to alleviate the urban heat island effect. Therefore, bismuth manganate has attracted the attention of many pigment manufacturers. [0003] Currently, Bi 2 mn 4 o 10 T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/12
CPCC01G45/1285C01P2004/61
Inventor 刘佳朱刘王艳王权王春泉
Owner FIRST RARE MATERIALS CO LTD
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