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Method for producing potassium manganite or sodium manganate

A technology for the production of potassium manganate and sodium manganate, applied in the direction of manganate/permanganate, etc., can solve the problems of high requirements on equipment structure and compressive performance, unsuitable manganese carbonate ore resources, etc., to shorten the production cycle , good adaptability, the effect of improving conversion rate

Inactive Publication Date: 2013-01-30
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
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Problems solved by technology

[0004] Chinese patent 200810056602.3 discloses a method for producing potassium manganate. At high temperature, the mixture of manganese ore powder and potassium hydroxide solution is subjected to gas-liquid co-current oxidation treatment with oxygen-containing gas, although the reaction time is shortened and the alkali resistance is reduced. Consumption, but need 0.2~0.5MPa reactor upper pressure
[0006] Both of the above two methods need to be reacted under high pressure conditions, which require high equipment structure and compressive performance. In addition, the existing patents only introduce the process of using manganese oxide ore to produce potassium (sodium) manganate, which is relatively rich in my country. The manganese carbonate resources are not applicable

Method used

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  • Method for producing potassium manganite or sodium manganate

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Comparison scheme
Effect test

Embodiment 1

[0023] (1) Crush 500g of pyrolusite with a manganese content of 35% to -200 mesh and account for 70% of the content, weigh 392g of potassium hydroxide, add 350ml of water, stir to dissolve the potassium hydroxide, in which the alkali concentration is 53%, add manganese ore Powder and stir to form a paste, put it into a roasting furnace, and sinter at 400°C for 1h, and the manganese-alkali molar ratio of the pyrolusite to potassium hydroxide is 1:2.2;

[0024] (2) Pulverizing the sintered ore obtained in step (1), so that the -200 mesh content accounts for 70%;

[0025] (3) Put the fine-grained powder ore in the step (2) into a fluidized bed reactor, feed air to keep the material in a suspended state, and keep the water content in the air at 50g / m 3 , Oxidative roasting at 220 ° C for 2h.

[0026] (4) Dissolving the roasted product in the step (3), the amount of water added is twice the mass of the roasted product, the stirring speed is 10r / min, the stirring time is 10min, and...

Embodiment 2

[0028] (1) Grind 500g of pyrolusite with a manganese content of 50% until the -200 mesh content accounts for 72%, weigh 473g of sodium hydroxide, stir and mix the two materials, put them in a roaster, and sinter at 350°C for 1h , the manganese alkali mol ratio of described pyrolusite and sodium hydroxide is 1:2.6;

[0029] (2) Pulverizing the sintered ore obtained in step (1), so that the -200 mesh content accounts for 70%;

[0030] (3) Put the fine-grained powder ore in the step (2) into a fluidized bed reactor, feed oxygen to keep the material in a suspended state, and keep the water content in the oxygen at 100g / m 3 , Oxidative roasting at 240 ° C for 1 h.

[0031] (4) Dissolving the roasted product in the step (3), the amount of water added is 2.5 times the quality of the roasted product, the stirring speed is 10r / min, the stirring time is 10min, and the solid-liquid separation is carried out. The obtained solid phase is mainly un The manganese dioxide of reaction, the g...

Embodiment 3

[0033] (1) Crush 650g of manganese carbonate with a manganese content of 30% to -200 mesh and account for 75%, weigh 556g of potassium hydroxide, add 550ml of water, and stir to dissolve the potassium hydroxide. The alkali concentration is 50%, and add manganese ore Powder and stir to form a paste, put it into a roasting furnace, and sinter at 800°C for 1.5h, and the manganese-alkali molar ratio of the manganese carbonate to potassium hydroxide is 1:2.8;

[0034] (2) Pulverizing the sintered ore obtained in step (1), so that the -200 mesh content accounts for 75%;

[0035] (3) Put the fine-grained powder ore in the step (2) into a fluidized bed reactor, feed in heated chlorine gas to keep the material in a suspended state, and keep the volume fraction of nitrogen in the chlorine gas at 70%, at 250°C Oxidation roasting 1h.

[0036] (4) Dissolve the roasted product in the step (3), add water 3 times the mass of the roasted product, stir at a speed of 10r / min, stir for 15min, an...

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Abstract

The invention belongs to the field of production of potassium (sodium) manganite. In the method, a mixed calcining material of manganese mineral powder and potassium (sodium) hydrate is oxidized by using an oxidizing gas, and the potassium (sodium) manganite is produced intermittently by adopting a gas-solid fluidized bed reactor. The method comprises the following steps of: (1) adding potassium (sodium) hydrate into manganese mineral powder serving as a raw material, stirring and calcining to obtain sintering charge; (2) milling the obtained sintering charge; (3) adding the obtained powder into the gas-solid fluidized reactor, introducing the oxidizing gas, regulating the ventilation amount to keep the powder to be in a fluidized state, keeping the temperature in the reactor to be between 220 DEG C and 300 DEG C, and reacting for 0.5-3 hours to obtain a potassium (sodium) manganite product; and (4) dissolving, stirring and standing the sintering product, performing solid-liquid separation to obtain a liquid phase which is a potassium (sodium) manganite solution and a solid phase which is unreacted manganese ore, and returning to the step (1). The method has the advantages of short process flow, simple equipment, high oxidation speed, short production period and capability of remarkably increasing the transformation rate of potassium (sodium) manganite.

Description

technical field [0001] The invention belongs to the technical field of production of potassium manganate (sodium), uses oxidizing gas to oxidize the mixed roasting material of manganese ore powder and potassium hydroxide (sodium), and uses a gas-solid fluidized bed reactor to intermittently produce potassium manganate or manganese Sodium acid method. Background technique [0002] Potassium manganate (sodium) is an important chemical product. It is an intermediate product that must be experienced in the production of potassium permanganate or sodium permanganate. Because of its strong oxidizing properties, it is widely used in organic synthesis, medicine and health , petrochemical, water treatment and other industries. [0003] The production of potassium manganate (sodium) is mainly realized by reacting manganese oxide ore with potassium hydroxide (sodium) in an oxidizing environment. Its preparation process can be divided into solid-state roasting method and liquid phase ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/12
Inventor 冯雅丽李浩然王纪学
Owner UNIV OF SCI & TECH BEIJING
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