Manganese sulfate production process, what is the color of manganese sulfate

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Electrolysis method can be used to prepare manganese metal by electrolysis of manganese sulfate solution by direct current electrolysis. This method is more costly, but the finished product is of good purity.

The preparation solution is heated by reaction of manganese ore powder and inorganic acid to prepare manganese salt solution, ammonium salt is added to the solution as a buffer, iron is removed by oxidizing and neutralizing by oxidant, heavy metals are removed by vulcanization purification agent, and then filtered and separated, and electrolytic additives are added to the solution as an electrolytic solution. The method of manganese smetic acid leaching is widely used in industrial production to prepare electrolyte, and the method of electrolysis of manganese metal by electrolysis of manganese chloride salt solution has not yet formed large-scale production.

The manganese ore powder used in the preparation of manganese sulfate is divided into two types: rhodochrosite and pyrolite. The main chemical reactions of manganese sulfate from rhodochrosite powder are:

To produce manganese sulfate from pyromanganese ore, the pyromanganese ore must first be reduced to manganese monoxide, and then leached with sulfuric acid, and its main chemical reaction is:

Electrolysis operation process. The water-soluble electrolyte of manganese sulfate containing ammonium sulfate is injected into the mold separation electrolytic cell, and the direct current is turned on to produce electrolysis, and the metal manganese is precipitated on the cathode plate, and oxygen is precipitated from the anode plate. The chemical equation is:

The cathode plate is periodically replaced, and the electrolysis products are passivated, washed, dried, peeled and other treatments to obtain manganese metal products. Laboratory preparation can be made by pyrometallurgical manganese, which includes silicon reduction (electrosilicon thermal) and aluminum reduction (thermite).

1. Aluminum reduction method (thermite method).

The thermite method is a method of producing manganese metal by using aluminum as a reducing agent and using the chemical heat released by reducing manganese oxide for smelting. The specific heat effect of MNO is small, and the reaction cannot actually be carried out; However, the specific heat effect of MNO2 is large, the content of reactive oxygen species is too large, and the reaction is almost explosive. Therefore Mn3O4 is best.

The equation for the reaction is:

Since the aluminum reduction method cannot remove impurities, it is necessary to use a purity of 8al+3mn3o4==9mn+4al2o3

High pyro-manganese ore (MNO2) is even used as a raw material for electrolytic manganese dioxide. The AL reduction method requires high aluminum cost, but it has the advantages of intense reaction process, relatively simple production equipment and process. However, even if the raw material with a particularly high manganese content is used for smelting, the alloy is still mixed with harmful impurities such as phosphorus and aluminum, and this method is rarely used to produce manganese metal.

2. Silicon reduction method (electrosilicon thermal method).

The main advantage of this method is that the production cost is relatively low, but compared with the electrolysis method, the manganese ore grade requirements are relatively high, and the purity of the manganese metal obtained is not high, with a manganese content of 94% and 98%. When smelting with silicon-manganese ore: MnO2 is decomposed into Mn3O4 and O2 at a high temperature of 1000 In the melting slag, Mn3O4 is decomposed by Si displacement

MNO is finally rereduced to manganese metal by Si. Reduction with silicon (Si) or low-carbon silicon-manganese, the calorific value is small, and it must be carried out in the electric furnace, and the process reaction is:

The above reaction is a reversible reaction, and lime needs to be added to make SiO2 slag, so that the reaction is carried out to the right.

The first floor is talking about potassium permanganate.

Manganese sulfate solids are white to light red fine crystals or powders.

The solution is very light pink or flesh-colored. (Color only occurs when it is very strong).

Manganese sulfate. Appearance and properties: white to light red fine crystals or powder.

Manganese ions are generally pale purplish red to pink, and the color of different manganese salts will be slightly different.

Dull black solid fuchsia solution

The valencies of manganese are: 0 Mn Manganese element +1 K5[mn(CN)6] +2 mnSO4 +3 K3[mn(CN)6] +4 mnO2 +5 Na3mnO4 +6 K2mnO4 +7 KMNO4 Among them, the secondary school range is: 0, +2, +4, +6, +7 The valency of chlorine elements is:

From -1 to +7 valence -1 valence HCL, CuCl2, etc. 0 valence Cl2 +1 valence HClL (.3573

This is very simple, that is, according to the proportion of manganese sulfate tetrahydrate to calculate the amount of the substance that is needed, and then calculate the mass of the corresponding manganese sulfate monohydrate with the amount of this substance, and add it to OK

In principle, sulfuric acid first reacts with sodium chloride to form hydrochloric acid, and hydrochloric acid reacts with manganese dioxide to form chlorine gas.