Technology for preparing high-purity manganous-manganic oxide with manganous sulfate solution

Abstract

The invention discloses a technology for preparing high-purity manganous-manganic oxide with a manganous sulfate solution. The technology is characterized by comprising the following steps that the manganous sulfate solution is heated; the temperature is controlled to be 50-90 DEG C; ammonia water is added to the manganous sulfate solution, and stirred; a PH (potential of hydrogen) value of the solution is controlled to be 9.5; stirring is continued for 1-2h after the ammonia water is stopped; filtering is performed; a manganous hydroxide filter cake is obtained; the manganous hydroxide filter cake is activated in a drying oven; deionized water is added to the activated manganous hydroxide filter cake; a solution is prepared; air is supplied for oxidation; after the PH value of the solution is 6.5, and no manganous ion is detected from the solution, the stirring is continued for 1-2h; cooling to a room temperature is performed; the filtering is performed; the filter cake is washed by the deionized water; the filtered filter cake is a manganous-manganic oxide precursor; manganous-manganic oxide is heated, dried, roasted and cooled; and high-purity manganous-manganic oxide is obtained. The technology is simple to operate and low in production cost; and produced manganous-manganic oxide is high in purity and large in specific surface area.

Description

technical field [0001] The invention belongs to the technical field of manganese compound preparation, in particular to a process for preparing high-purity trimanganese tetraoxide with sulfate. Background technique [0002] High-purity manganese manganese tetroxide is a high-tech product that the state encourages and gives priority to development. It is listed as a high-tech industrialization project that is currently prioritized and supported by the Ministry of Science and Technology, the Ministry of Finance, and the State Administration of Taxation. Trimanganese tetroxide is a black square crystal, which is crystallized by burning, and belongs to the spinel category. Trimanganese tetroxide is one of the important raw materials for the preparation of manganese zinc ferrite and other soft magnetic materials. Manganese zinc ferrite has narrow remanence induction, very low power loss and high initial permeability, making it widely used It is used in aerospace, communication,...

AI Technical Summary

Problems solved by technology

[0003] Trimanganese tetroxide started to be produced in China in 1997, and has now formed an annual production scale of nearly 40,000 tons. However, due to poor quality, the products are mainly supplied to the domestic market, and only a small part is exported.

The main problems of the current technology are: low technical content; high production cost, about 13,000 yuan per ton, and the price is about 15,000 yuan per ton, which is almost unprofitable; uneven particle size, large particle size, about more than 2mm; the content of various impurities is generally high, and only ordinary grade products can be produced

[0004] The existing preparation process of trimanganese tetraoxide includes: (1) two-stage oxidation method to prepare high-purity trimanganese tetraoxide, which cannot be completely oxidized in the liquid phase, and needs to be converted into trimanganese tetraoxide by solid phase oxidation below 300°C; ( 2) Manganese sulfate is directly pyrolyzed at high temperature to prepare trimanganese tetraoxide, and sulfur dioxide and sulfur trioxide gas will be produced during the roasting process; (3) Manganese metal air oxidation method is used to prepare high-purity trimanganese tetraoxide, but there are still some problems. Heat control and reaction conditions are not easy to control, the product contains a lot of manganese dioxide and manganese trioxide, the conversion rate of manganese tetraoxide is not high, and the specific surface area is small, which is difficult to meet the needs of the development of the electronics industry and new energy industry

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