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Method for preparing zinc sulfate solution dechlorinating agent

A technology of zinc sulfate solution and dechlorination agent, which is applied to the improvement of process efficiency, photography process, instruments, etc., can solve the problems of poor stability of cuprous ion, limited dechlorination effect, slow speed, etc., and achieves large capacity of dechlorination agent. , the effect of high dechlorination efficiency and simple production process

Active Publication Date: 2014-03-12
LAIBIN CHINA TIN SMELTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the poor stability of cuprous ions, it is easy to be oxidized to +2-valent copper ions and easily reduced to zero-valent metallic copper. Therefore, the reaction process of forming cuprous ions is a slow and low-level process. , resulting in the dechlorination effect of the cuprous ion dechlorination method being greatly limited

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  • Method for preparing zinc sulfate solution dechlorinating agent

Examples

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no. 1 example

[0022] Present embodiment is the first example of the method for preparing zinc sulfate solution dechlorination agent of the present invention, comprises the steps:

[0023] (1) Formation of cuprous sulfide scum: Add 1.5 tons of copper-lead alloy containing Cu3% to an iron pot with a capacity of 2 tons and heat up. When the copper-lead alloy is completely melted and the temperature reaches 500 °C, add industrial sulfur 14 kg, then fully stirred for 20 minutes to obtain cuprous sulfide scum, remove the cuprous sulfide scum, put it into a special bucket, and obtain 220 kg of cuprous sulfide scum containing Cu22%, S6.1%, Pb67% ;

[0024] (2) Alkaline washing transformation: 220 kg of cuprous sulfide scum, 35 kg of sodium hydroxide, made into 1.0 cubic meters of lye, at a temperature of 25 ° C, washed for 24 hours, the final pH value was 12, filtered, and sodium sulfide was produced 0.9 cubic meters of solution, 302 kg of wet cuprous hydroxide solid filter residue, and sodium sul...

no. 2 example

[0027] Present embodiment is the second example of the method for preparing zinc sulfate solution dechlorination agent of the present invention, comprises the steps:

[0028](1) Formation of cuprous sulfide scum: add 4.0 tons of copper-lead alloy containing Cu4% to an iron pot with a capacity of 5 tons and heat up. When the copper-lead alloy is completely melted and the temperature reaches 530°C, add industrial sulfur 50 kg, then fully stirred for 25 minutes to obtain cuprous sulfide scum, remove the cuprous sulfide scum, put it into a special bucket, and obtain 595 kg of cuprous sulfide scum containing Cu26%, S6.8%, Pb63% ;

[0029] (2) Alkali washing transformation: 595 kg of cuprous sulfide scum, 112 kg of sodium hydroxide, made into 3.0 cubic meters of lye, washed at a temperature of 29 ° C for 36 hours, and the final pH value was 11.5, filtered to produce sodium sulfide 2.7 cubic meters of solution, 887 kg of wet cuprous hydroxide solid filter residue, and sodium sulfide...

no. 3 example

[0032] Present embodiment is the third example of the method for preparing zinc sulfate solution dechlorination agent of the present invention, comprises the steps:

[0033] (1) Formation of cuprous sulfide scum: Add 3.8 tons of copper-lead alloy containing 5% Cu to an iron pot with a capacity of 5 tons to heat up. When the copper-lead alloy is completely melted and the temperature reaches 550°C, add industrial sulfur 58 kg, then fully stirred for 30 minutes to obtain cuprous sulfide scum, remove the cuprous sulfide scum, put it into a special bucket, and obtain 591 kg of cuprous sulfide scum containing Cu32%, S8.4%, Pb57% ;

[0034] (2) Alkali washing transformation: 591 kg of cuprous sulfide scum, 130 kg of sodium hydroxide, made into 3.0 cubic meters of lye, washed at a temperature of 34 ° C for 48 hours, the end point pH value was 11.0, filtered, and sodium sulfide was produced 2.7 cubic meters of solution, 881 kg of wet cuprous hydroxide solid filter residue, and sodium ...

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Abstract

The invention discloses a method for preparing a zinc sulfate solution dechlorinating agent. The method comprises the following steps: adding copper-lead alloy containing 3-5 percent of Cu into an iron pot and heating; adding industrial sulphur when the alloy is completely fused and the temperature of a liquid is up to 500-550 DEG C; fully stirring for 20-30 minutes to obtain cuprous sulfide scum; washing the cuprous sulfide scum by use of a sodium hydroxide alkaline liquid under the condition that the pH value is 11-12 at the room temperature to generate a sodium sulphide solution and a cuprous hydroxide solid and filtering; drying filter slags at the temperature of 50-120 DEG C; crushing and packaging to obtain the zinc sulfate solution dechlorinating agent. The prepared dechlorinating agent is simple in production process, high in dechlorinating efficiency and high in volume of dechlorinating agent, and copper of the dechlorinating agent exists in a cuprous ion form and a dechlorinating product can be regeneratively cycled.

Description

technical field [0001] The invention relates to the field of nonferrous metal smelting, in particular to a method for preparing a zinc sulfate solution dechlorination agent. Background technique [0002] During the wet zinc smelting process, impurities such as copper, cadmium, arsenic, antimony, cobalt, nickel, fluorine, and chlorine in the zinc sulfate solution need to be removed before entering the electrolysis process to produce cathode zinc sheets. [0003] When the cationic impurities copper, cadmium, arsenic, antimony, cobalt and nickel in the solution are high, it will cause the zinc sheet to melt back and burn the plate during the electrolysis process. The most mature process for removing copper, cadmium, arsenic, antimony, cobalt, nickel and other impurities in zinc sulfate solution is the zinc powder replacement method, which uses the metal activity of zinc in zinc powder to be higher than that of copper, cadmium, and arsenic , antimony, cobalt, nickel metal activ...

Claims

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Application Information

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IPC IPC(8): C22B19/20C22B3/46C25C1/16
CPCY02P10/20
Inventor 吴鋆
Owner LAIBIN CHINA TIN SMELTING