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Control method for desulfurization of manganous dithionate in manganese oxide ore

A technology of manganese dithionate and manganese oxide ore, which is applied in the direction of chemical instruments and methods, separation methods, process efficiency improvement, etc., can solve the problems of unfavorable subsequent utilization of manganese sulfate purity, impact, and high processing cost

Pending Publication Date: 2021-06-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method also produces manganese dithionate (MnS 2 o 6 ), the content is 8-10g / L, which has a negative impact on the purity of manganese sulfate and the subsequent utilization of manganese sulfate
Therefore, this method is difficult to produce continuously in industrial application
For example, the patent No. 2019108092343 discloses a high-efficiency decomposition method of manganese dithionate based on the catalytic oxidation of manganese dioxide, but this method is a post-processing method, and requires relatively harsh operating conditions, and the processing cost is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A control method for desulfurizing manganese dithionite from manganese oxide ore, comprising the following steps:

[0039] Step 1: In the manganese ore desulfurization reactor, add 100g of manganese oxide and 1000mL of anolyte that have passed through a 200-mesh sieve to prepare ore slurry, and the liquid-solid ratio is 10:1;

[0040] Step 2: Add 0.95 g of ferric sulfate to the pulp obtained in Step 1 to obtain a desulfurization solution;

[0041] Step 3: Pass the sulfur dioxide-containing flue gas into the desulfurization liquid obtained in step 2, and fully react; during the reaction, control the pH to 2, the temperature to 60°C, and the desulfurization reaction time to 2h. Control flue gas flow rate 10L / min, SO 2 Content 1%, O 2 The content is 10%.

[0042] After the desulfurization reaction was completed, the MnS in the solution was measured 2 o 6 The content is 2.22g / L, the desulfurization rate is 55%, and the manganese leaching rate is 43%.

[0043] Under th...

Embodiment 2

[0045]A control method for desulfurizing manganese dithionite from manganese oxide ore, comprising the following steps:

[0046] Step 1: In the manganese ore desulfurization reactor, add 50g of manganese oxide and 500mL of anolyte that have passed through a 200-mesh sieve to prepare ore-forming slurry, and the liquid-solid ratio is 10:1;

[0047] Step 2: Add 2.93g / L iron oxide slag (45% iron content) to the pulp obtained in step 1 to obtain desulfurization liquid;

[0048] Step 3: Pass the sulfur dioxide-containing flue gas into the desulfurization liquid obtained in step 2, and fully react; during the reaction, control the pH to 2, the temperature to 60°C, and the desulfurization reaction time to 2h. Control flue gas flow rate 5L / min, SO 2 Content 1%, O 2 The content is 10%.

[0049] After the desulfurization reaction was completed, the MnS in the solution was measured 2 o 6 The content is 0.85g / L, the desulfurization rate is 60%, and the manganese leaching rate is 56%. ...

Embodiment 3

[0052] A control method for desulfurizing manganese dithionite from manganese oxide ore, comprising the following steps:

[0053] Step 1: In the manganese ore desulfurization reactor, add 100g of manganese oxide and 1000mL of anolyte that have passed through a 200-mesh sieve to prepare ore slurry, and the liquid-solid ratio is 10:1;

[0054] Step 2: adding 4.76g of ferric sulfate to the pulp obtained in step 1 to obtain a desulfurization solution;

[0055] Step 3: Pass the sulfur dioxide-containing flue gas into the desulfurization liquid obtained in step 2, and fully react; during the reaction, control the pH to 2.2, the temperature to 80°C, and the desulfurization reaction time to 2h. Control flue gas flow rate 10L / min, SO 2 Content 1%, O 2 The content is 10%.

[0056] After the desulfurization reaction was completed, the MnS in the solution was measured 2 o 6 The content is 0.65g / L, the desulfurization rate is 47%, and the manganese leaching rate is 63%.

[0057] Unde...

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Abstract

The invention discloses a control method for desulfurization of manganous dithionate in manganese oxide ore. The control method for desulfurization of the manganous dithionate in the manganese oxide ore comprises the following steps of 1, fully mixing manganese oxide with a solution to prepare ore pulp, wherein the content of the manganese oxide in the ore pulp is 20 to 150g / L; 2, adding a ferric iron-containing raw material into the ore pulp obtained in the step 1 to obtain a desulfurization solution, wherein the mass ratio of manganese to iron is (3: 1) to (10: 1); and 3, introducing flue gas containing sulfur dioxide into the desulfurization solution obtained in the step 2, and fully reacting, wherein in the reaction process, the pH is controlled to be 1 to 3, and the temperature is 50 to 90 DEG C. By adopting the control method for desulfurization of the manganous dithionate in the manganese oxide ore provided by the invention, the content of manganese sulfate mother liquor in the desulfurized desulfurization solution can be ensured, meanwhile, the content of byproduct manganous dithionate is controlled to be very low, the subsequent treatment of the manganese dithionate is not needed, the method is directly applied to the production of industrial manganese sulfate or electrolytic manganese, the subsequent resource recycling of the manganese sulfate is not influenced, and valuable utilization of manganese resources in manganese ore is realized while sulfur dioxide pollution treatment is realized.

Description

technical field [0001] The invention relates to the fields of environmental protection, energy saving and hydrometallurgy, in particular to a control method for desulfurizing manganese dithionite from manganese oxide ore. Background technique [0002] Manganese ore desulfurization technology has been developed rapidly in recent years. This technology uses manganese oxides in natural manganese ore and sulfur dioxide to remove sulfur dioxide from flue gas through redox reaction, and then oxidizes to obtain manganese sulfate solution. This technology effectively solves the disadvantages of traditional flue gas desulfurization, and does not produce by-products that cause secondary pollution. Compared with the utilization of manganese resources in leaching manganese ore by reducing and roasting, this technology simplifies the leaching process of manganese in manganese ore, and has a good effect on low-grade manganese ore, while avoiding reduction and calcination flue gas emission...

Claims

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Application Information

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IPC IPC(8): C22B47/00C22B3/06B01D53/50B01D53/80
CPCB01D53/507B01D53/80B01D2258/0283C22B3/08C22B47/00Y02P10/20
Inventor 杨林蒋文举姚露江霞蒲鹏燕
Owner SICHUAN UNIV
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