Process for abstracting bismuth by low-temperature alkaline fusion metallurgy of bismuth clean ore

A bismuth refining and alkali process technology, applied in the field of low-temperature alkaline smelting bismuth concentrate to extract bismuth, can solve the problems of bad operating conditions, high energy consumption and high cost, and achieve the advantages of improving the bismuth recovery rate, reducing the smelting temperature and eliminating pollution. Effect

Inactive Publication Date: 2008-10-22
CENT SOUTH UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0002] Traditional bismuth metal smelting is divided into wet method and fire method; 3 Leaching-iron powder replacement method, FeCl 3 Leaching-diaphragm electrode method, FeCl 3 Leaching-hydrolysis bismuth precipitation method, chlorine selective leaching method, hydrochloric acid-nitrous acid leaching method, chlorination-hydrolysis method, ore slurry electrolysis method, etc. The wet method of bismuth smelting process has large investment and high cost, especially producing a large amount of waste residue and wastewater , great harm, need to control environmental pollution
Pyrochemical bismuth smelting mainly uses reverberatory furnace smelting, that is, bismuth concentrate is mixed with reducing agent coal powder, iron filings, flux soda ash and other ingredients, and then added to reverberatory furnace for smelting to produce slag, matte and rough bismuth. The melting temperature is as high as 1300~ 1350°C, the smelting time is more than 10 hours, the energy consumption is large, the operating conditions are harsh, and a large amount of low-concentration sulfur dioxide is discharged to pollute the environment

Method used

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  • Process for abstracting bismuth by low-temperature alkaline fusion metallurgy of bismuth clean ore

Examples

Experimental program
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Effect test

Embodiment 1

[0022] A: Alkaline smelting of bismuth concentrate

[0023] Dissolve 10 grams of caustic soda in 15ml of water in advance to make a concentrated alkali solution, then knead it evenly with 100 grams of A# bismuth concentrate, place it on the bottom of a graphite crucible, cover it with 147 grams of soda ash, and then melt it, adding it 20 minutes before the melting time reaches 5 grams of NaNO3 were smelted at 700°C for 60 minutes and kept at 750°C for 30 minutes; the weight of crude bismuth gold was 24.78g, the direct yield of bismuth was 97%, and the slag and matte were 211.74g.

[0024] B: ball milling leaching

[0025] Add 211.74 grams of slag and matte, 850 grams of steel balls, and 500 mL of water to a 1000 mL ball mill, grind and soak at 90°C for 4 hours, then filter, wash the slag with 100 mL of hot water for 3 times, the pH value is 7.5, and the dry weight of the filter residue is 59.1 grams , filtrate 560mL, containing Na 2 CO 3 148.5g / L, NaOH4.1g / L, NaOH 2 SO 4...

Embodiment 2

[0029] Taking B# bismuth concentrate as the sample, the scale is 1000g concentrate / time,

[0030] A: Alkaline smelting of bismuth concentrate

[0031] Dissolve 100 grams of caustic soda in 150ml of water in advance to make a concentrated alkali solution, then mix and knead evenly with 1000 grams of B# bismuth concentrate, place it on the bottom of a graphite crucible, cover it with 1470 grams of soda ash, and then smelt it. Add it 20 minutes before the smelting time reaches 50 grams of NaNO3 were smelted at 650°C for 60 minutes and kept at 700°C for 60 minutes; the weight of crude bismuth gold was 236.4g, the direct yield of bismuth was 96.5%, and the slag and matte were 2167.4g.

[0032] B: ball milling leaching

[0033] Add 2,167.4 grams of slag and matte, 9,000 grams of steel balls, and 6,000 mL of water to a 10-liter ball mill, grind and immerse at 90°C for 5 hours, then filter, wash the slag with 1,000 mL of hot water for 5 times, the pH value is 7.2, and the dry weight ...

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Abstract

The invention provides a method for extracting bismuth from low temperature caustic fusion bismuth refined ores. In the method, under conditions of the low temperature of between 600 and 900 DEG C and the alkalinity, crude bismuth is extracted from bismuth refined ores by smelting and fusion, and sodium carbonate is leached out by ball-milling slag and sulphonium. The method comprises main steps of the caustic fusion, the milling-leaching and the regeneration of alkali. Due to the adoption of the caustic fusion, the method of has the advantages that the temperature of smelting bismuth is greatly lowered, iron filings and reduction coal are not necessary to add, and particularly low-priced sodium carbonate replaces the majority of sodium hydroxide which lowers smelting cost; directly smelting crude bismuth and regenerating sodium hydroxide greatly simplify the whole process and improve the recovery rate, and the environmental pollution of sulfur dioxide is eliminated. The method is very important to the bismuth smelting and the energy conservation and emission reduction.

Description

[technical field] [0001] The invention relates to a method for extracting bismuth by low-temperature alkaline smelting bismuth concentrate and belongs to the field of pyrometallurgy. [Background technique] [0002] Traditional bismuth metal smelting is divided into wet method and fire method; 3 Leaching-iron powder replacement method, FeCl 3 Leaching-diaphragm electrode method, FeCl 3 Leaching-hydrolysis bismuth precipitation method, chlorine selective leaching method, hydrochloric acid-nitrous acid leaching method, chlorination-hydrolysis method, ore slurry electrolysis method, etc. The wet method of bismuth smelting process has large investment and high cost, especially producing a large amount of waste residue and wastewater , harmful, need to control environmental pollution. Pyrochemical bismuth smelting mainly uses reverberatory furnace smelting, that is, bismuth concentrate is mixed with reducing agent coal powder, iron filings, flux soda ash and other ingredients, ...

Claims

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Application Information

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IPC IPC(8): C22B30/06
CPCY02P10/20
Inventor 唐朝波唐谟堂肖剑飞杨建广何静杨声海鲁君乐
Owner CENT SOUTH UNIV
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