SU1355614A1 - Method of obtaining manganese dioxide with increased bulk density - Google Patents

Abstract

This invention relates to methods for producing manganese dioxide with an increased bulk density used to make chemical current sources. The aim of the invention is to increase the apparent density of the target product and to simplify the Process. The method is carried out as follows. Manganese dioxide to be compacted is mixed with an aqueous solution of manganese nitrate at t not more than 140 ° C. The resulting paste is fed to a kiln, the temperature in which is maintained within the range of .150-300 °. The calcination is carried out until the release of nitrogen dioxide stops. The product obtained after roasting is crushed and manganese dioxide is obtained with a higher bulk density. In the event that the desired saturation density is not achieved in a single treatment treatment (when compacting light varieties), the process of mixing the obtained product with a new portion of manganese nitrate, heat treatment, and grinding is repeated. The method allows increasing the bulk density of various grades of manganese dioxide by 19.4-255% - (depending on the total density of the original product). It is advisable to treat the initial manganese dioxide with a 30-62.4% solution of Mn (NO /,) at a mass ratio of MnOj:: Mn (NO g), 1: (0.2-1, 6). 1 z.p, f-ly. 4 tab. I (L 00 ate JV O5

Description

The invention relates to methods for producing manganese dioxide used to make chemical current sources. The bulk density of a commercial product is one of the most important indicators of its quality, with other constant conditions increasing the bulk density leads to a proportional increase in the energy capacitance of sources.

The aim of the invention is to increase the apparent density of manganese dioxide and to simplify the process.

Take 100–200 g of manganese dioxide to be compacted, mix in a porcelain dish with 20–160 g of a solution of manganese nitrate (based on 100% Mn (NO) 2) and pereimeivagot to obtain a homogeneous mass. The mass, together with the porcelain cup, is placed in a muffle cabinet heated to 150-500 ° C, and calcined ... until the release of the brown nitrogen dioxide vapor {for 0.5-5 h) stops. The mass after heat treatment is cooled to 30-60 ° C and then transferred to a porcelain mortar and ground. The bulk density of the resulting manganese dioxide is determined. If necessary, further compaction of the crushed manganese dioxide after the first treatment is subjected to repeated treatment until the required natural density is obtained or filled, and the product density from the last two treatments does not match, which indicates the impossibility of further compaction of manganese dioxide. .

The resulting manganese dioxide is used as a finished product without any additional processing,

The mass ratio of MnOj (source): Mn (W5) ,; (equal to 1: 0.02: 1, 6) is determined by the type of raw manganese dioxide used for compaction. A quantity of manganese nitrate, equal to 0.2, is advisable to be used to compact the least porous manganese dioxide (electrolytic manganese dioxide (ed))

five

0

6:

five

g

0

five

0

five

14.2

i, 6 - for the most porous (waste vitamin production) (ORP), intermediate amounts for manganese dioxide with medium porosity (powdered manganese dioxide (PDM; manganese dioxide, obtained by roasting manganese carbonate (KDM)).

When the amount of manganese nitrate is less than 0.2 mass fractions per 1 mass fraction to be compacted, the degree of compaction is lower than that of the prototype, with an amount of more than 1.6, there is practically no further compaction of the product.

The results of compaction of EDM, PDM, OZP and KDM are given in Table. 1-4, respectively. Nasypnzs .; The density of the feedstock is as follows, kg / m. for EDM 2010; for PDM 1230; for ORP 560; for Kda 1430.

The maximum degree of compaction under the conditions of the proposed method is%: for EDM 9.4; for PDM 65.8; for ORP 255; for KDM 57.3.

According to the known seal off. subjected to only KDM with a degree of compaction of 15.3%.

Claims (2)

Invention Formula one . Method of heat (rot of manganese dioxide with a high bulk density, including treating manganese dioxide with a lower bulk density with a solution containing nitrate ions, heat treating the resulting mass at 150-300 ° C, and grinding the product, characterized in that, in order to increase product and simplify the process, the processing of the original manganese dioxide lead aqueous solution of manganese nitrate. 2. The method according to claim 1, differs from the fact that the treatment of the initial dioxide: manganese is carried out with a solution of manganese nitrate with a concentration of 30-62.4% and with a mass ratio of MnO 2 to Mn (NO) equal to 1: (0.2 -1.6). Table I 200 45.1 40 1: 0,2 100 45.1 100 A5.1 45.1 160 180 1: 1.6 300 1: 1.8 300. 10,100 62.4 100 11,200 65.8 40 : 0.2 250 1 12,100 65,8 100 13,200 56Z HNO, 100 g HNO, 6lit2 215 1700 Conditions of the proposed method 150 140 1990 Also  . five one five 165 173 138 217 141 19 2040 2030 1920 1620 1630 1250 The increase in the bulk density of the product as compared with experience does not occur, the ratio No. Oi: Mn {NO,) 7 3 J below optimal Conditions of the proposed method Low bulk density of the product, manganese nntrate concentration is higher than optimal Also Prototype processing Table3 Table