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Treatment method for double-salt crystals during manganese electrolysis

A processing method and technology for crystals, applied in the field of double salt crystals processing, can solve problems such as land occupation, environmental risk resource waste, etc., and achieve the effects of reducing land occupation, saving the cost of clearing, transporting and stacking, and improving the utilization rate.

Inactive Publication Date: 2018-08-14
NINGXIA TIANYUAN MANGANESE LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, since ammonium sulfate cannot be recycled at present, it is necessary to establish a special solid waste dump to ensure the safe disposal of ammonium sulfate, which not only occupies a large amount of land, but also causes environmental risks and a large amount of waste of resources

Method used

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Embodiment Construction

[0020] A treatment method for the double salt crystals of the electrolytic manganese process, comprising the steps of:

[0021] (1) The double salt crystals produced in the electrolytic manganese production process are dissolved to a saturated solution with water at 40°C; the double salt crystals include ammonium sulfate, magnesium sulfate, manganese sulfate, wherein the content of ammonium sulfate is 38%, The content of magnesium sulfate is 32%, the content of manganese sulfate is 5%;

[0022] (2) Transport the saturated solution to the sedimentation tank and adjust the pH value to 6.5-8.5 with ammonia water;

[0023] (3) Filter the neutralized solution, and send the obtained filtrate into the carbonization tower to deal with the CO in the kiln desulfurization flue gas during manganese slag treatment. 2 The gas reacts and produces manganese carbonate precipitates, wherein the temperature in the carbonization tower is 40°C to 50°C, CO 2 The gas concentration is 30% to 60%; ...

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Abstract

The invention belongs to the technical field of chemical engineering, and relates to a treatment method for double-salt crystals generated during manganese electrolysis. The method includes the stepsthat 1, the double-salt crystals generated during manganese electrolysis are dissolved into a saturated solution with water at 40 DEG C; 2, the pH value is regulated to 6.5-8.5 with ammonium hydroxide; 3, filtering is carried out, and filter liquor is reacted with CO2 gas to generate settled manganese carbonate; 4, solid-liquid separation is carried out on the settled manganese carbonate, and filter residues are washed by water till the content of manganese carbonate is greater than 92%; 5, magnesium oxide is added into filter liquor obtained after washing to react to generate magnesium sulfate and ammonium hydroxide; 6, reaction products are conveyed to a deamination tower, and ammonium hydroxide is turned into gas to be removed; and 7, a solution obtained after deamination is subjected to crystal separation to obtain magnesium sulfate crystals. By means of the method, resource utilization of the double-salt crystals generated during manganese electrolysis is realized, circular economy development of manganese electrolysis is realized, the clearing and stacking cost is saved, land occupation and environment pollution are reduced, and good social and economical benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering and relates to a method for treating double salt crystals produced in the process of manganese electrolysis. Background technique [0002] Existing electrolytic manganese often adopts wet smelting technology, which mainly uses sulfuric acid in the anolyte to convert the Mn in the manganese carbonate ore 2+ The ions are leached out, then add a vulcanizing agent to remove impurities, add ammonia water to adjust the pH value of the solution, and finally remove the impurity precipitate by pressure filtration. At the same time, ammonium sulfate will be generated to increase the conductivity of the electrolyte and play a buffer role. . [0003] During the electrolysis process, the anolyte dissolves the active ingredients in the ore to produce electrolytic manganese. Since the anolyte is used in a closed circuit, the magnesium ions in the qualified liquid will rise by about 2g / L every time ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/22C22B3/44C25C1/10C25C7/06
CPCC22B3/44C22B26/22C25C1/10C25C7/06Y02P10/20
Inventor 贾天将张志华段锋宋正平刘宁田祯张博周杰
Owner NINGXIA TIANYUAN MANGANESE LIMITED
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