Technology for extracting tellurium dioxide from tellurium-containing smelting slag
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A technology of tellurium dioxide and smelting slag, applied in the field of extracting tellurium dioxide
Active Publication Date: 2013-03-27
CHENZHOU CITY JINGUI SILVER IND CO LTD
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There are technical defects in the traditional alkaline leaching method. The volatilization of tellurium is large, the loss rate is high, and the energy consumption is high; in the process of alkaline leaching, the alkali consumption is large; the leaching rate of tellurium is not high, and the unleached tellurium is dispersed in each Among the products of the subsequent smelting process, it affects the subsequent process
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[0036](1) Take 100g of tellurium-containing smelting slag, add water according to the liquid-solid mass ratio of 3:1 to make slurry, control the temperature at 75°C, react for 2 hours, and the particle size is 200 mesh; immediately filter and separate the primary water immersion liquid and rich bismuth and copper , silver, gold leaching slag; obtain leaching slag 88.2g, tellurium-containing amount is 2.46%, bismuth-containing amount is 40.27%, copper-containing amount is 11.02%, and silver-containing amount is 1.367% in leaching slag;
[0037] (2) Add the primary water immersion residue obtained above into a mixed solution containing 30g / L sodium hydroxide and 10g / L sodium sulfite, under the condition of controlling the liquid-solid ratio to 3:1, the...
[0043] (1) Take 100g of tellurium-containing smelting slag, add water according to the liquid-solid mass ratio of 4:1 to make slurry, control the temperature at 90°C, react for 3 hours, and the particle size is 260 mesh; immediately filter and separate the primary water immersion liquid and rich bismuth and copper , silver, gold leaching slag; obtain leaching slag 84.5g, contain tellurium in the leaching slag and be 1.96%, bismuth-containing amount is 46.48%, copper-containing amount is 12.67%, and silver-containing amount is 1.514%;
[0044] (2) Add the primary water immersion residue obtained above into a mixed solution containing 50g / L sodium hydroxide and 20g / L sodium sulfite, under the condition that the liquid-solid ratio is controlled at 4:1,...
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Abstract
The invention relates to a technology for extracting tellurium dioxide from tellurium-containing smelting slag. The technology comprises the following steps: ball-milling tellurium slag, leaching by water, carrying out reduction alkali leaching, vulcanizing, carrying out silicon removal purification, and neutralizing to precipitate tellurium. The method has the advantages of tellurium leaching rate improvement, reduction of the alkali application amount in the leaching operation, and production cost reduction. The method is characterized in that sodium hydrosulphite is adopted as a transition agent to transit insoluble high-valence tellurium to low-valence tellurium, so the leaching rate leaching rate is increased. The total tellurium leaching rate can reach above 90% under a suitable technological condition; and after recovering tellurium through neutralizing, the TeO2 grade of the smelting slag can reach above 50%, and the content of tellurium in the waste liquid obtained after the neutralizing is 0.1-0.3g / L. The method also has the advantages of further enrichment of copper, lead, bismuth, antimony and precious metals in the leaching slag, realization of the resource reuse, production cost reduction, and energy saving, and is of great importance to the resource recovery and the environmental protection.
Description
technical field [0001] The invention relates to a process for extracting tellurium dioxide from tellurium-containing smelting slag, which belongs to the field of nonferrous metal hydrometallurgy and secondary resource recovery. Background technique [0002] Tellurium, located in the fifth cycle, group VI, is a non-metallic element. Tellurium is a rare element, and its content in the autothermal world is extremely low. According to relevant literature reports, its content in the earth's crust is 0.0006ppm, and it is scattered throughout the earth's crust, making it difficult to form mineral deposits. Tellurium has a wide range of uses, mainly used as alloy additives, brighteners in electroplating solutions, catalysts for petroleum cracking, and protective sleeves for submarine cables. With the development of science and technology, tellurium is more and more widely used in new energy and new materials. Therefore, it is known as "the vitamin of today's industry, national de...
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