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4N tellurium preparation method based on alkaline electro-deposition process

A technology of electrodeposition and process, applied in the field of electrochemical purification and refining of scattered metal tellurium, can solve the problems of low deposition current density, high comprehensive cost, and low deposition efficiency, and achieve environmentally friendly industrialization, high deposition current density, and easy The effect of industrialization

Active Publication Date: 2017-12-15
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current electrodeposition process for preparing 4N refined tellurium also has a low deposition current density (50A / m 2 ), low deposition efficiency (80%), long production cycle (discharging in 3 days), poor density of tellurium products (poor adhesion on the electrode plate, easy to drop to the bottom of the electrolytic cell), low utilization rate of the electrolyte, comprehensive The high cost is not conducive to the industrialization of 4N refined tellurium and the development of related industries

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  • 4N tellurium preparation method based on alkaline electro-deposition process

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preparation example Construction

[0023] The invention discloses a method for preparing 4N tellurium based on an alkaline electrodeposition process, comprising the following steps:

[0024] Step 1. Weighing: Weigh the following components in parts by weight: 1 part of sodium hydroxide tablet, 2 to 6 parts of ultrapure water, and 1 to 5 parts of coarse tellurium dioxide powder;

[0025] Step 2, at room temperature, add the weighed sodium hydroxide tablet into ultrapure water, stir and dissolve completely to obtain hot lye; add the weighed coarse tellurium dioxide powder into the hot lye for reaction, during the reaction The temperature is controlled at 70-90°C to prepare the pre-electrolyte solution; the purity of tellurium in the crude tellurium dioxide powder is ≥60%, and the water content is 15-20%;

[0026] Step 3, adding a purifier to purify the pre-electrolyte solution, controlling the temperature at 70-90°C during the treatment, and filtering to prepare an electrolyte; wherein the purifier accounts for 1...

Embodiment 1

[0035] The steps and processing conditions of the present embodiment are as follows:

[0036] Add 100g of sodium hydroxide tablets into 200g of ultrapure water, stir to dissolve completely, and obtain hot lye. Add 200g of crude tellurium dioxide (60% tellurium, 15% water) powder into the hot lye, control the temperature at 80°C during the reaction, and obtain the pre-electrolysis solution after the reaction. Add 3g of sodium sulfide to the pre-electrolysis solution for purification, control the temperature at 90°C during treatment, and filter to obtain the electrolyte solution after treatment. Cool the electrolyte to room temperature, add 0.5g of gelatin, stir and dissolve completely, and then conduct a constant voltage pre-deposition treatment on the electrolyte at 0.8V for 1h, then at 85A / m 2 Constant current electrodeposition under high current density for 30h, the electrodeposited product tellurium blocks were obtained. After stripping the tellurium block from the electrod...

Embodiment 2

[0041] Add 120g of sodium hydroxide tablets into 300g of ultrapure water, stir and dissolve completely to obtain hot lye. Add 230g of crude tellurium dioxide (60% tellurium, 15% water) powder into the hot lye, control the temperature at 90°C during the reaction, and obtain the pre-electrolysis solution after the reaction. Add 5g of ammonium thiocyanate to the pre-electrolysis solution for purification, control the temperature at 85°C during treatment, and filter to obtain the electrolyte solution after treatment. Cool the electrolyte to room temperature, add 3g of polyacrylamide, stir and dissolve completely, and conduct constant voltage pre-deposition treatment on the electrolyte at 0.75V for 8h, then at 90A / m 2 Constant current electrodeposition under high current density for 25h, the electrodeposited product tellurium blocks were obtained. After stripping the tellurium block from the electrode plate, wash it several times with ultrapure water, then dry it, and take a sampl...

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Abstract

The invention discloses a 4N tellurium preparation method based on an alkaline electro-deposition process. The method includes the following steps that a sodium hydroxide piece is added into ultrapure water at an indoor temperature, stirring and dissolving are conducted, and hot alkaline liquor is obtained; crude tellurium dioxide powder is added into the hot alkaline liquor for reacting, and electrolysis ex-liquid is obtained through preparation; a purifying agent is added so that the electrolysis ex-liquid can be purified and filtered, and an electrolyte is obtained through preparation; the electrolyte is cooled to the indoor temperature, an addition agent is added, the electrolyte is subjected to constant voltage pre-deposition treatment after stirring and dissolving are completed, and then constant current electro-deposition treatment is conducted so that electro-deposition product tellurium blocks and electrolysis post-liquid can be obtained; and after the tellurium blocks are stripped from a plate electrode, washing with the ultrapure water is performed for several times, and then drying is conducted so that 4N tellurium can be prepared. The preparation method disclosed by the invention has the advantages that the deposition electric current density is large, deposition efficiency is high, the preparation period is short, the tellurium product compactness is good, the electrolyte can be recycled, cost is low, the environment is friendly and industrialization is can be facilitated; and the 4N tellurium preparation method can be effectively applied to alkaline electro-deposition for preparing the 4N tellurium.

Description

technical field [0001] The invention belongs to the technical field of electrochemical purification and refining of scattered tellurium metal, and in particular relates to a preparation method of 4N tellurium based on an alkaline electrodeposition process. Background technique [0002] Scattered metal tellurium is a precious strategic resource, known as the "vitamin" of modern industry, national defense and cutting-edge technology, and an important supporting material for contemporary high-tech and new materials, widely used in metallurgy, petroleum, chemical industry, electronics, electrical , ceramics, pigments and medicine and other fields. The main source of tellurium is the by-product anode slime of copper refinery, in which the tellurium content is usually less than 10%; other sources are the slurry of sulfuric acid plant, lead anode slime, bismuth tellurium concentrate and electrostatic precipitator of sulfuric acid plant and smelter. dust etc. The purity of telluri...

Claims

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Application Information

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IPC IPC(8): C25B1/00
CPCC25B1/00
Inventor 王瑞林王刚陈金伟钟静范金龙李庆
Owner SICHUAN UNIV
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