Pseudo goethite method for removing iron in zinc leaching solution

A technology for goethite and leaching solution, applied in the field of removing iron in zinc smelting leachate by goethite method, can solve the problems of strict operating process conditions, long reaction and settling time, and high energy consumption, and achieves good filtration performance and improved The effect of reaction speed and energy consumption reduction

Inactive Publication Date: 2013-12-25
HUBEI DABEIJIANG ENVIRONMENTAL TECH CO LTD
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Problems solved by technology

The advantage of the traditional goethite method is good filtration performance; the disadvantages are: (1) the solution needs to be raised to a higher temperature, and the energy consumption is high; (2) the operating process conditions are strict, and the reaction and sedimentation when using air or oxygen as the oxidant It takes a long time, or in order to increase the reaction speed and improve efficiency, it needs to spend huge sums of money to build multiple continuous reaction tanks; (3) The use of neutralizing agent lime water will also cause the problem of pipeline blockage

Method used

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Embodiment Construction

[0022] The technical solutions in the present invention will be described in more detail below in combination with specific implementation methods.

[0023] The false goethite method provided by the present invention removes iron in the leach solution of zinc smelting, and has the following steps: under normal temperature conditions, the pH value of the leach solution is adjusted to 4.5 to 5 with calcium carbonate; hydrogen peroxide is slowly added to the solution, and the addition speed of the hydrogen peroxide is To keep the concentration of ferric iron in the solution less than 1 g / L, the total amount added is 2.2 times the mass of ferrous iron in the leaching solution. During the settlement process of goethite, the pH value of the leachate is always kept in the range of 4.5 to 5 by adjusting the amount of calcium carbonate added; finally, the goethite sediment is removed by filtration, and the process of iron removal and purification of the zinc smelting leachate is complet...

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Abstract

The invention provides a pseudo goethite method for removing iron in a zinc leaching solution. The method comprises the following steps: adjusting the PH of leachate to be 4.5-5 by using calcium carbonate at room temperature; adding oxydol into the leachate to enable ferrous iron ions to be removed in a manner of goethit, and keeping the pH to be 4.5-5 by adding calcium carbonate; lastly, filtering to remove goethit precipitation. According to the method, a heating process is eliminated, the setting velocity of iron is improved, energy consumption is effectively reduced, and moreover, the production efficiency is improved.

Description

[0001] technical field [0002] The invention relates to the field of impurity removal of leachate in hydrometallurgy process, in particular to the removal of iron in zinc smelting leachate by adopting goethite method. [0003] Background technique [0004] In the hydrometallurgical industry, the leachate of ore often contains more impurity metal ions, and the electrolysis process has extremely strict requirements on the content of impurities in the working liquid, so the deep removal of impurities in the leachate before electrolysis is an essential step. The leaching solution of zinc smelting often contains a certain amount of iron ions, and iron exists in the form of divalent and trivalent. Iron removal is an important process for the purification of leaching solution. [0005] At present, domestic iron removal methods mainly include ferric hydroxide method, jarosite method, and goethite method. The ordinary ferric hydroxide method is to oxidize the ferric ions in the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B3/04
CPCY02P10/20
Inventor 安源水张亨峰苏晓亮
Owner HUBEI DABEIJIANG ENVIRONMENTAL TECH CO LTD
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