Method for comprehensively recovering valuable metals from low-grade tellurium slag
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A valuable metal, low-grade technology, used in non-metallic elements, selenium/tellurium compounds, chemical instruments and methods, etc., can solve the problems of prolonged metal recovery period, large metal loss, low tellurium leaching rate, etc. The effect of operability, reducing the amount of slag returned, and improving the direct yield
Active Publication Date: 2011-04-06
ZHUZHOU SMELTER GRP
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The process of extracting tellurium from tellurium slag is tellurium slag crushing-ball milling-water immersion-neutralization-calcination-electrolysis-refined tellurium. In this process, the leaching rate of tellurium is low, and the tellurium content in water leaching residue is still as high as 3-7 %, and the content of metal copper, antimony, and bismuth is also very high, the slag is returned to the converter for smelting, and re-enriched with anode slime to form slag, which leads to low direct recovery rate of tellurium, high energy consumption, large metal loss, and prolonged metal recovery cycle Valuable metals such as copper, bismuth and antimony have not been directly recovered
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[0035] Take 200g of low-grade tellurium slag containing Te4.41%, Cu9.41%, Sb8.93%, and Bi34.09%, and grind it to a particle size of 100% below 80 mesh. Ratio of 7:1, stirring speed 150r / min under the conditions of leaching 2hr filtration, sulfuric acid leaching solution 1.5L, containing Cu11.91g / L, Te0.3g / L, acid leaching residue after drying weighed 158g, its composition (% ): Contains Te5.16, Cu0.96, Sb12.67, Bi41.88, Cu leaching rate is 93.4% during sulfuric acid leaching. Copper is recovered from sulfuric acid leaching solution by conventional methods.
[0036] Sulfuric acid leaching residue 100g, after leaching for 4 hours under the conditions of volume 600mL, hydrochloric acid concentration 6mol / L, temperature 85°C, stirring speed 150r / min, cool to room temperature and filter, hydrochloric acid leaching solution 710mL, its composition (g / L) Te6.9 . Bi96.9. The leached slag is returned to the converter for smelting.
[0041] Take 200g of low-grade tellurium slag containing Te6.64%, Cu9.64%, Sb9.71%, and Bi27.69%, and grind it to a particle size of 100% or less than 80 mesh. The ratio was 7:1, the stirring speed was 150r / min, leached for 1.5hr and filtered, the sulfuric acid immersion solution was 1.36L, containing Cu13.61g / L, and the acid leaching residue was weighed 151.2g after drying, and its composition (%): containing Te8.58, Sb12.49, Bi35.89, Cu leaching rate is 96% during sulfuric acid leaching. Copper is recovered from the sulfuric acid leaching solution, and the sulfuric acid leaching residue is carried out to the next process.
[0042] Sulfuric acid leaching residue 100g, after leaching for 4 hours under the conditions of volume 600mL, hydrochloric acid concentration 8mol / L, temperature 85°C, stirring speed 150r / min, cool to room temperature and filter, hydrochloric acid leaching solution 610mL, its composition (g / L) Te14. 03. Sb19.57, Bi58.25, acid leaching residue weighed 8g af...
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Abstract
The invention discloses a method for comprehensively recovering valuable metals from low-grade tellurium slag, and aims to provide the method for comprehensively recovering the valuable metals from the low-grade tellurium slag. The method is characterized by comprising the following steps of: A, crushing and grinding the tellurium slag until the tellurium slag is below 80 meshes, stirring and leaching with a sulfuric acid and filtering to obtain sulfuric acid leach liquor and sulfuric acid leach residue; B, stirring and leaching the sulfuric acid leach residue obtained in the step A with a hydrochloric acid, cooling and filtering to obtain hydrochloric acid leach liquor and hydrochloric acid leach residue; C, stirring the hydrochloric acid leach liquor obtained in the step B, and adding alkali to precipitate tellurium and antimony so as to obtain liquor obtained after tellurium and antimony precipitation and tellurium and antimony slag; D, leaching the tellurium and antimony slag obtained in the step C with sodium hydroxide for 2 to 4 hours and filtering to obtain alkaline leach liquor and antimony slag; and E, adding the alkali into the liquor obtained after tellurium and antimony precipitation obtained in the step C to precipitate bismuth, settling and filtering to obtain bismuth chloride slag and recovering the bismuth. The method is mainly used for comprehensively recovering the valuable metals such as copper, bismuth, antimony, tellurium and the like from the low-grade tellurium slag.
Description
technical field [0001] The invention relates to a method for comprehensively recovering valuable metals, in particular to a method for comprehensively recovering valuable metals from low-grade tellurium slag. technical background [0002] Tellurium is a kind of scattered metal, which is relatively dispersed in the earth's crust, and it is difficult to form deposits. It is mainly enriched and recovered from electrolytic anode slime of copper, lead and bismuth, acid mud for sulfuric acid production, and washing mud for pulp production. At present, in the process of pyroprocessing anode sludge, soda ash is added to produce tellurium slag, and tellurium is enriched in tellurium slag, which is an important raw material for extracting tellurium. In addition, the tellurium slag produced in the alkaline refining process of crude bismuth is also one of the important raw materials for extracting tellurium. The process of extracting tellurium from tellurium slag is tellurium slag crus...
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