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Method for removing fluorine ion from manganese sulfate solution for producing electrolytic manganese metal

A technology of manganese sulfate solution and electrolytic metal manganese, which is applied in the direction of photographic process, instrument, photographic auxiliary process, etc., can solve the problems of inability to produce, reduce current efficiency, corrode anode plate, etc., achieve strong operability and improve utilization rate , the effect of reducing investment

Inactive Publication Date: 2012-07-18
广西靖西市一洲锰业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the existing sulfide impurity removal process, only copper, cobalt, nickel, lead, iron), and zinc can be removed, and fluorine cannot be removed by sulfide impurity removal.
The manganese sulfate solution produced by using manganese carbonate, manganese dioxide ore and pyrite ore and the manganese sulfate solution produced by two-mine one-step method (pyrite and manganese dioxide ore) have a fluoride ion content of more than 150ppm. During the production process, if the fluoride ion content in the manganese sulfate solution is too high (F-≥90ppm), the corrosion of the anode plate will be accelerated, the current efficiency will be reduced, and the product quality will be affected. In severe cases, the production cannot be carried out.
[0003] In the existing industrial production, the method for removing fluorine in the known and commonly used manganese sulfate solution is to carry out by adding milk of lime, which is to make calcium hydroxide and fluoride ions form insoluble calcium fluoride, and absorb it by silicon dioxide in the solution. The disadvantage of the method is that in the process of adding gray milk, the local pH value of the solution will be greater than 7, resulting in the loss of manganese sulfate, and the insoluble calcium fluoride formed when the pH is less than 6 will reverse dissolve, resulting in the removal of fluoride ions in the form of ions. The form exists in the solution, and the silica content in the manganese sulfate solution cannot be added from the outside, and it is difficult to remove the fluoride ion in the manganese sulfate solution when it reaches 100ppm
It cannot meet the requirement of fluoride ions in manganese sulfate solution ≤60ug / g in electrolytic metal production

Method used

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  • Method for removing fluorine ion from manganese sulfate solution for producing electrolytic manganese metal
  • Method for removing fluorine ion from manganese sulfate solution for producing electrolytic manganese metal
  • Method for removing fluorine ion from manganese sulfate solution for producing electrolytic manganese metal

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Embodiment 1

[0021] Add manganese carbonate ore, manganese dioxide ore, pyrite, and sulfuric acid to the leaching tank (7 meters in diameter and 6.5 meters in height) to react and leach manganese sulfate solution, and add calcium carbonate and diatomaceous earth (2:1) as a defluoridation agent For the removal of fluoride ions, see Table 1-1 for the dosage of various raw materials, among which the calcium content in calcium carbonate is ≥50%, the silicon dioxide content in diatomite is ≥90%, and the calcium content is ≤5%.

[0022] After adding the fluoride removal agent, the temperature of the manganese sulfate solution is controlled at 50° C., the pH is controlled at 3.0, and the reaction time is controlled at 50 minutes.

[0023] After the fluorine is removed from the manganese sulfate solution according to the above conditions, the subsequent process is operated according to the original electrolytic manganese metal process to prepare a qualified manganese sulfate solution for the produc...

Embodiment 2

[0034] Add manganese carbonate ore, manganese dioxide ore, pyrite, and sulfuric acid to the leaching tank (7 meters in diameter and 6.5 meters in height) to react and leach manganese sulfate solution, and add calcium carbonate and diatomaceous earth (2:1) as a defluoridation agent For the removal of fluoride ions, see Table 2-1 for the dosage of various raw materials, among which the calcium content in calcium carbonate is ≥50%, the silicon dioxide content in diatomite is ≥90%, and the calcium content is ≤5%.

[0035] After adding the fluoride removal agent, the temperature of the manganese sulfate solution is controlled at 60° C., the pH is controlled at 4.0, and the reaction time is controlled at 40 minutes.

[0036] After the fluorine is removed from the manganese sulfate solution according to the above conditions, the subsequent process is operated according to the original electrolytic manganese metal process to prepare a qualified manganese sulfate solution for the produc...

Embodiment 3

[0048] Add manganese carbonate ore, manganese dioxide ore, pyrite, and sulfuric acid to the leaching tank (7 meters in diameter and 6.5 meters in height) to react and leach manganese sulfate solution, and add calcium carbonate and diatomaceous earth (2:1) as a defluoridation agent For the removal of fluoride ions, see Table 3-1 for the dosage of various raw materials, among which the calcium content in calcium carbonate is ≥50%, the silicon dioxide content in diatomite is ≥90%, and the calcium content is ≤5%.

[0049] After adding the fluoride removal agent, the temperature of the manganese sulfate solution is controlled at 70° C., the pH is controlled at 5.0, and the reaction time is controlled at 35 minutes.

[0050] After removing fluorine from the manganese sulfate solution according to the above conditions, the follow-up process is operated according to the original electrolytic manganese metal process to prepare a qualified manganese sulfate solution for the production of...

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Abstract

The invention provides a method for removing fluorine ion from manganese sulfate solution for producing electrolytic manganese metal, which comprises the following step of: when the manganese sulfate solution for producing the electrolytic manganese metal is prepared from rhodochrosite, pyrolusite, pyrite and vitriol, adding fluorine removing agent calcium carbonate and kieselguhr to remove the fluorine ion from the solution, so that the fluorine ion content in the manganese sulfate solution is less than or equal to 60mug / g. The method is simple to operate, the loss of the manganese in the solution can be avoided when the fluorine ion is removed, a cathode can not be corroded when a metal sheet is produced by the fluorine ion-free manganese sulfate solution in an electrolysis way, and the single plate is high in yield.

Description

technical field [0001] The invention relates to the production of electrolytic metal manganese, in particular to a method for removing fluoride ions in a manganese sulfate solution for electrolytic metal manganese production. Background technique [0002] In the existing industrial production of electrolytic manganese metal, an aqueous solution of manganese sulfate and sulfuric acid is used as the electrolyte. The stainless steel plate is used as the cathode, and the lead-antimony-tin-silver quaternary alloy is used as the anode. The manganese sulfate solution in the electrolyte comes from manganese carbonate and manganese dioxide. The manganese sulfate solution used in conventional production of electrolytic manganese metal generally adopts the manganese sulfate solution produced by manganese carbonate ore and sulfuric acid. With the expansion of the production capacity of electrolytic manganese metal, the demand for manganese carbonate ore is increasing day by day, resulti...

Claims

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Application Information

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IPC IPC(8): C25C1/10
Inventor 曹世文李鹏唐巍
Owner 广西靖西市一洲锰业有限公司
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