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A method for extracting high-purity manganese from manganese slag

A manganese slag and high-purity technology, which is applied in the field of extracting high-purity manganese, can solve the problems of inability to use continuous purification reaction devices, long oxidation reaction time, and low production efficiency, and achieve the goals of reducing economic costs, simple steps, and improving production efficiency Effect

Active Publication Date: 2020-09-22
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] 3. Due to the long time of oxidation reaction, continuous purification reaction device cannot be used, only intermittent purification device can be used, resulting in high cost and low production efficiency;

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 1kg of manganese slag into 1L of water, soak and filter to obtain Mn-containing 2+ The waste liquid with a content of 3.2g / L contains CaSO as an impurity 4 , MgSO 4 , (NH 4 ) 2 SO 4 etc., add 14 mmol of potassium permanganate to the above filtrate, and mix well. Add Mg(OH) to the above mixture 2 , adjust the pH of the solution to be 10.3, filter and collect the precipitate after reacting for 2 minutes, and analyze the Mn element content in the precipitate by XRF to be 58%, and no Mn can be detected in the filtrate 2+ , can meet emission standards. Add 70mmol of dilute sulfuric acid 100ml and 20mmolNa to the precipitate 2 SO 3 , after stirring for 5 minutes, a manganese sulfate solution was obtained, and the purity of the manganese sulfate in the solute was 97%.

Embodiment 2

[0035] Wash 1kg of manganese slag with 1L of water, and the eluent must contain Mn 2+ The waste liquid with a content of 3.1g / L contains CaSO as an impurity 4 , MgSO 4 , (NH 4 ) 2 SO 4 etc., add 10mmol sodium percarbonate to the eluent above, and mix well. Add Ca(OH) to the above mixture 2 , adjust the pH of the solution to be 9.8, filter and collect the precipitate after reacting for 3 minutes, and analyze the Mn element content in the precipitate by XRF to be 59%.

Embodiment 3

[0037] Wash 1kg of manganese slag with 2L of water, and the eluent must contain Mn 2+ The waste liquid with a content of 1.6g / L contains CaSO as an impurity 4 , MgSO 4 , (NH 4 ) 2 SO 4Etc., add 5mmol sodium percarbonate to the above eluent, and mix well. MgO was added to the above mixed solution to adjust the pH of the solution to 10.7, and the precipitate was collected by filtration after reacting for 5 minutes, and the Mn element content in the precipitate was analyzed by XRF to be 61%.

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PUM

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Abstract

The invention discloses a method for extracting high-purity manganese from manganese slag, and relates to the field of resource utilization of the manganese slag and manganese-containing wastewater. The method includes the following steps that 1, water is added into the manganese slag, soluble salt in the manganese slag is washed out through soaking or leaching, and then filtering is conducted toobtain manganese-containing waste liquid; 2, an oxidizing agent is added into the manganese-containing waste liquid and uniformly stirred; and 3, after step 2, a precipitator is added to adjust the pHvalue of the solution to be 8.5-12 for reaction, then filtering is conducted, and precipitate is collected. The content of the manganese element recycled through the method in all elements can reach45-75%, the purity is high, the steps are simple, the reaction time is short, the cost is low, and the method has good industrial application prospects.

Description

technical field [0001] The invention relates to the field of resource utilization of manganese slag and manganese-containing wastewater, in particular to a method for extracting high-purity manganese from manganese slag. Background technique [0002] Manganese is an essential trace element for the human body, but excessive intake of manganese can cause harm to the human body. Manganese pollution is mainly caused by manganese-related enterprises, including manganese mining enterprises and electrolytic manganese production enterprises. The pollution sources mainly include manganese slag and manganese-containing wastewater. Manganese slag contains some substances such as manganese sulfate, calcium sulfate, magnesium sulfate and ammonium sulfate. Due to the low grade of manganese, it is often directly discarded by the electrolytic manganese industry. According to statistics, as of 2017, only about 15.8 million tons of manganese slag have been piled up by manganese-related enter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B47/00
CPCC22B7/006C22B47/00Y02P10/20
Inventor 王焱良李军汪迪王亚普苏玉忠洪艳珍
Owner XIAMEN UNIV
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