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Novel bismuth smelting separation method

A new method, the technology of bismuth oxide, is applied in the direction of elements such as selenium/tellurium, which can solve the problems of low recovery rate, high cost, and environmental pollution, and achieve the effects of increasing bismuth content, reducing energy consumption, and improving purity

Inactive Publication Date: 2012-07-04
SIHUI CITY HONGMING PRECIOUS METALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large volume and high water content of bismuth compounds, the direct smelting slag rate is high, the cost is high, the recovery rate is low, and it will produce toxic gases and pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 8 tons of bismuth compound, its composition is: bismuth 56.40wt%, tellurium 1.51wt%, moisture 35.22wt%.

[0014] (1) Add the bismuth compound to the stirred reactor, add tap water according to the solid-to-liquid mass ratio of 1:1, start the machine and stir until the bismuth compound becomes a slurry, and add it to the reactor according to the ratio of mass ratio bismuth: sodium hydroxide = 1:0.5 Solid sodium hydroxide, after adding alkali, control the reaction temperature at 90-95°C, stir and react for 1 hour, so that bismuth is converted into bismuth oxide, tellurium is dissolved into the alkali solution, and then bismuth oxide and tellurium-containing alkali solution are separated by pressure filtration Obtain bismuth oxide and tellurium lye respectively, and wash the bismuth oxide with water.

[0015] (2) The main components of the bismuth oxide obtained by adding alkali are: bismuth 78.45wt%, tellurium 0.10wt%, water 13.41wt%. Bismuth oxide is uniformly mixed acc...

Embodiment 2

[0018] 10 tons of bismuth compound, its composition is: bismuth 54.64wt%, tellurium 1.43wt%, water 30.25wt%.

[0019] (1) Add the bismuth compound to the stirred reactor, add tap water according to the solid-to-liquid mass ratio of 1:1.5, start the machine and stir until the bismuth compound becomes a slurry, and add it to the reactor according to the mass ratio of bismuth: sodium hydroxide = 1:0.6 Solid sodium hydroxide, after adding alkali, control the reaction temperature at 90-95°C, stir and react for 1.4 hours to convert bismuth into bismuth oxide, tellurium dissolves into the alkali solution, and then separate the bismuth oxide and tellurium-containing alkali solution through pressure filtration Obtain bismuth oxide and tellurium lye respectively, and wash the bismuth oxide with water.

[0020] (2) The main components of the bismuth oxide obtained by adding alkali are: bismuth 77.13wt%, tellurium 0.10wt%, water 14.81wt%. Bismuth oxide is uniformly mixed according to the...

Embodiment 3

[0023] 9.5 tons of bismuth compound, its composition is: bismuth 53.10wt%, tellurium 1.02wt%, water 27.32wt%.

[0024] (1) Add the bismuth compound to the stirred reactor, add tap water according to the solid-to-liquid mass ratio of 1:2, start the machine and stir until the bismuth compound becomes a slurry, and add it to the reactor according to the mass ratio of bismuth: sodium hydroxide = 1:0.8 Solid sodium hydroxide, after adding alkali, control the reaction temperature at 90-95°C, and stir for 2 hours to convert bismuth into bismuth oxide, tellurium dissolves into the alkali solution, and then separate bismuth oxide and tellurium-containing alkali solution through pressure filtration Obtain bismuth oxide and tellurium lye respectively, and wash the bismuth oxide with water.

[0025] (2) The main components of the bismuth oxide obtained by adding alkali are: bismuth 75.69wt%, tellurium 0.08wt%, water 14.85wt%. Bismuth oxide is uniformly mixed according to the mass ratio o...

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Abstract

The invention discloses a novel bismuth smelting separation method. According to the method, bismuth compounds and water are mixed and stirred to a slurry state according to a mass ratio being 1:(1-2) to form a slurry mixture, then, sodium hydroxide is added into the slurry mixture according to the bismuth to sodium hydroxide mass ratio being 1:(0.5-0.8), the temperature is controlled to be 90 to 95 DEG C, the materials are stirred for reaction for 1 to 2 hours so that the bismuth is converted into bismuth tellurium oxides to be dissolved into aqueous alkali, then, the filtering is carried out so that bismuth oxides and tellurium-containing solution are separated to respectively obtain bismuth oxides and tellurium lye, the bismuth oxides are washed by water, and the bismuth oxides are reduced and smelted to produce bismuth metal. The novel bismuth smelting separation method has the advantages that the bismuth compounds are converted into the bismuth oxides though alkaline addition, the bismuth oxides have small size, low moisture content and high bismuth content, the smelting energy consumption is reduced, only the bismuth oxides are produced, negative ions such as nitrate radicals, chlorine radicals and carbonic acid radicals are eliminated, poisonous gas generated in the smelting process is eliminated, the bismuth oxides are thoroughly separated from tellurium, nitrate radicals and the like after being filtered and washed, the impurity tellurium is eliminated, the bismuth purity is improved, the bismuth metal is produced through reduction and smelting, and the recovery rate of the bismuth reaches 99 percent.

Description

Technical field: [0001] The invention relates to a precious metal smelting method, in particular to a new bismuth smelting and separation method. Background technique: [0002] The way to recover bismuth from the alloy liquid produced by existing hydrometallurgy is generally to first adjust the pH to sink bismuth, and the compound of sinking bismuth is smelted to produce rough bismuth. Bismuth precipitation by pH generally produces bismuth compounds such as bismuth hydroxide, bismuth oxychloride or bismuth subcarbonate, and simultaneously precipitates tellurium. Due to the large volume and high water content of bismuth compounds, the direct smelting slag rate is high, the cost is high, the recovery rate is low, and it will produce toxic gases and pollute the environment. Invention content: [0003] The purpose of the present invention is to provide a new bismuth separation and smelting method with small volume, low water content, high bismuth content, low smelting energy ...

Claims

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Application Information

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IPC IPC(8): C22B30/06C01B19/02
Inventor 江继明江启明黄明程兰
Owner SIHUI CITY HONGMING PRECIOUS METALS
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