Method for purifying zinc sulfate solution and removing cobalt by using arsenic ash lixivium

A technology of zinc sulfate solution and leaching solution, which is applied in the direction of improving process efficiency, etc., can solve problems such as arsenic soot polluting the environment, and achieve the effect of solving environmental pollution

Active Publication Date: 2011-03-30
ZHUZHOU SMELTER GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a method for purifying zinc sulfate solution and removing cobalt with arsenic soot leaching solution, which not only solves the problem of environmental pollution caused by arsenic soot produced by lead-zinc smelters, but also solves the problem of purifying zinc sulfate solution with zinc powder-arsenic salt Purchasing and transporting highly toxic arsenic salt (AS) during the process of removing Co and Ni 2 o 3 arsenic) difficulty

Method used

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  • Method for purifying zinc sulfate solution and removing cobalt by using arsenic ash lixivium
  • Method for purifying zinc sulfate solution and removing cobalt by using arsenic ash lixivium

Examples

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Embodiment 1

[0041] Adopt the present invention to the zinc sulfate solution of wet method zinc smelting i.e. middle and supernatant 12M 3 Purify, the main impurity components in the supernatant are: Cu0.80g / L, Co0.010g / L, Ni0.010g / L, Cd0.01g / L. Follow these steps:

[0042] Step 1: Add zinc powder to remove Cu. The temperature is 70°C. Add zinc powder to the supernatant under constant stirring, and the reaction time is 60 minutes to obtain 150 mg / L of Cu in the liquid after copper removal.

[0043] Step 2: Four purification tanks are used for purification and cobalt removal, and the effective volume of each purification tank is 1m 3 , add copper removal solution, zinc powder and arsenic soot leaching solution to the purification tank at the same time under the condition of constant stirring. 3 / h, the weight of As in the arsenic soot leaching solution is half of the weight of Cu in the solution after copper removal plus the sum of the weight of Co and Ni, the potential of 1# tank is -550...

Embodiment 2

[0047] Adopt the present invention to hydrometallurgy zinc sulfate solution namely medium supernatant 12M 3 Purify, the main impurity components in the supernatant are: Cu1.2g / L Co0.025g / L, Ni0.023g / L, Cd0.05g / L. Follow these steps:

[0048] Step 1: Add zinc powder to remove Cu. The temperature is 70°C. Add zinc powder to the supernatant under constant stirring, and the reaction time is 50 minutes to obtain 200 mg / L of Cu in the liquid after copper removal.

[0049] Step 2: Four purification tanks are used for purification and cobalt removal, and the effective volume of each purification tank is 1m 3 , add copper removal solution, zinc powder and arsenic soot leaching solution to the purification tank at the same time under the condition of constant stirring. 3 / h, the weight of As in the arsenic soot leaching solution is half of the weight of Cu in the solution after copper removal plus the sum of the weight of Co and Ni, the potential of 1# tank is -550mV, the potential of...

Embodiment 3

[0053] Adopt the present invention to hydrometallurgy zinc sulfate solution namely medium supernatant 19.2M 3 After purification, the main impurities in the supernatant are: Cu1.50g / L, Co0.034g / L, Ni0.31g / L, Cd0.08g / L. Follow these steps:

[0054] Step 1: Add zinc powder to remove Cu. The temperature is 70°C. Add zinc powder to the supernatant under constant stirring, and the reaction time is 40 minutes to obtain 220 mg / L of Cu in the liquid after copper removal.

[0055] Step 2: Four purification tanks are used for purification and cobalt removal, and the effective volume of each purification tank is 1m 3 , add copper removal solution, zinc powder and arsenic soot leaching solution into the purification tank at the same time under the condition of constant stirring. 3 / h, the weight of As in the arsenic soot leaching solution is half of the weight of Cu in the solution after copper removal plus the sum of the weight of Co and Ni, the potential of 1# tank is -555mV, the pote...

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Abstract

The invention discloses a method for purifying a zinc sulfate solution and removing cobalt by using arsenic ash lixivium. The invention aims at providing a method for purifying the zinc sulfate solution and removing the cobalt by using the arsenic ash lixivium, which is characterized by comprising the following steps of: A, adding zinc powder to remove copper: adding the zinc powder in a ZnSO4 solution to remove the copper, filtering to obtain copper residue and a copper-removed solution, controlling the copper content of the copper-removed solution to 150-300mg / L; B, removing cobalt and nickel: adding the zinc powder and arsenic ash lixivium into the copper-removed solution obtained in the step A to remove the cobalt and the nickel, filtering to obtain a cobalt-removed solution and cobalt and nickel purified residue; and C, removing cadmium: adding the zinc powder into the cobalt-removed solution obtained in the step B to remove the cadmium, stirring and filtering to obtain a new solution, recovering zinc from the new solution and recovering the cadmium from the cadmium residue . The invention is mainly used for purifying the zinc sulfate solution and removing the cobalt in a wet-process zinc-smelting plant.

Description

technical field [0001] The invention relates to a method for purifying zinc sulfate solution to remove cobalt, in particular to a method for purifying zinc sulfate solution to remove cobalt by using arsenic soot leaching solution. technical background [0002] In the process of zinc hydrometallurgy, cobalt is one of the most important impurities that harm the electrowinning of zinc. When the cobalt content in the electrolytic solution reaches a certain level, it will precipitate on the cathode and form a micro-battery with zinc, so that the zinc will be discharged into the solution, which not only reduces the current efficiency of the zinc electrowinning, but also causes double-hole-shaped " burning board” phenomenon. Zinc electrowinning has very strict requirements on the content of impurities in the electrowinning solution. If the impurity content in the electrowinning solution exceeds the standard, zinc electrowinning cannot be carried out normally. The control of cobalt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B19/00
CPCY02P10/20
Inventor 林文军窦传龙刘一宁赵为上廖贻鹏魏文武袁建明
Owner ZHUZHOU SMELTER GRP
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