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Low-temperature alkaline lead-smelting method

A lead smelting and low-temperature technology, applied in the field of metallurgy, can solve problems such as air, land and water pollution, high energy consumption, smoke pollution, etc., and achieve the effect of good environment, mild conditions and pollution elimination

Inactive Publication Date: 2010-06-09
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional lead smelting process is mainly sintering machine sintering blast furnace reduction smelting or bottom blowing furnace smelting process, both of which are carried out at a high temperature of 1250-1350 °C, which not only consumes high energy, but also has the following environmental problems that are difficult to solve: (1) The lead smelting process produces a large amount of lead vapor and dispersed lead mist, which causes serious pollution of air, land and water sources in the surrounding area of ​​the factory; low concentration SO 2 Flue gas pollution, lead matte treatment and copper recovery are currently unsolved problems

Method used

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  • Low-temperature alkaline lead-smelting method

Examples

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Effect test

Embodiment 1

[0043] Low-temperature alkaline lead smelting with 1# lead sulfide concentrate as raw material, the composition of the concentrate is (%): Pb70.12, Fe6.08, S15.04, Zn2.84, Cu0.40, SiO 2 0.79.

[0044] A. Alkaline smelting process

[0045] Weigh 21.66 grams of caustic soda and dissolve it in 30ml of water, mix with 100 grams of 1# lead concentrate and 5 grams of reduced pulverized coal, granulate, place in a graphite crucible, weigh 76.07 grams of soda ash to cover the surface of the pellets, and rise to Heat preservation and smelting at 850°C for 60 minutes; the obtained crude lead weighs 65.68g, the direct yield of lead is 92%, and the basic slag is 83.5g.

[0046] B. Water immersion process

[0047] Add 350mL of water and 82.3g of slag to a 1000ml beaker, filter at 60°C for 2 hours, wash the filter residue with 100mL of water for 3 times, and the pH value is 7.5. The dry weight of the filter residue is 31.1g, containing Pb18.04%, Zn9.13%, Cu1.29%, Fe19.55%; filtrate 500mL,...

Embodiment 2

[0057] 2# lead sulfide concentrate and lead sulfate slag are used as raw materials, and the mass ratio is 1:1. The composition of 2# lead concentrate is (%): Pb51.55, Fe5.34, S18.52, Zn11.53, SiO 2 2.69, Cu0.11; the composition (%) of lead sulfate slag is Pb65, S10.04; the mixture contains Pb58.27%, S14.28%.

[0058] A. Melting process

[0059] Weigh 34.6 grams of caustic soda and dissolve it in 30ml of water, mix it with 100 grams of mixed lead raw material and 15 grams of reduced pulverized coal, and granulate it, place it in a graphite crucible, then weigh 75.70 grams of soda ash, cover the surface of the granulated material, and raise to 850°C Heat preservation and smelting for 60 minutes; the obtained crude lead weighs 54.11g, the direct yield of lead is 92.8%, and the basic slag is 131.04g.

[0060] B. Water immersion process

[0061] Add 350mL of water into a 1000ml beaker, soak 125g of the above-mentioned slag in it, loosen it, raise the temperature to 90°C, stir an...

Embodiment 3

[0071] Still use 1# lead sulfide concentrate as raw material for low temperature alkaline lead smelting.

[0072] A. Alkaline smelting process

[0073] Weigh 40.5 grams of caustic soda and dissolve it in 50 ml of water, then weigh 56.00 grams of soda ash and 5 grams of reduced pulverized coal, mix them with 100 grams of 1# lead concentrate, place them in a graphite crucible, heat up to 650 ° C for 90 minutes, and obtain crude lead The weight is 64.61g, the direct yield of lead is 90.5%, and the basic slag is 93.8g.

[0074] B, C, D, E, F processes are as embodiment 1.

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Abstract

The invention discloses a low-temperature alkaline lead-smelting method, which is characterized by smelting lead sulphide concentrate and a secondary lead raw material at the temperature of between 600 and 900 DEG C under an alkaline condition to extract crude lead, and then using hydrometallurgy and a beneficiation method to process furnace slag to recover accompanying elements such as copper, zinc and the like and regenerate alkali for return use. The method comprises the processes such as alkaline smelting, water immersion, beneficiation of liquid leached residue, alkali regeneration from a water extract, sulfur recovery and the like. The method greatly reduces lead-smelting temperature, and reduces smelting cost due to the regeneration and the reuse of the alkali. CuS, Cu2S, ZnS, SiO2 and the like have no phase transformation during the smelting, so the beneficiation method can be used to recover the accompanying elements such as the copper, the zinc and the like, which has easy realization; and particularly, the method eliminates the pollution of lead dust, lead fog and sulfur dioxide flue gas to the environment seriously existing in conventional high-temperature lead smelting method. The method is a clean lead-smelting method with mild conditions and good environment, and has important significance and application prospect on the improvement of lead smelting technology.

Description

technical field [0001] The invention relates to a method for smelting lead with mixed alkali at low temperature, belonging to the field of metallurgy. Background technique [0002] The traditional lead smelting process is mainly sintering machine sintering blast furnace reduction smelting or bottom blowing furnace smelting process, both of which are carried out at a high temperature of 1250-1350 °C, which not only consumes high energy, but also has the following environmental problems that are difficult to solve: (1) The lead smelting process produces a large amount of lead vapor and dispersed lead mist, which causes serious pollution of air, land and water sources in the surrounding area of ​​the factory; low concentration SO 2 Smoke pollution, lead matte treatment and copper recovery are unresolved problems. Contents of the invention [0003] The object of the invention is to provide a method for smelting lead with mixed alkali at low temperature. This method greatly ...

Claims

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Application Information

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IPC IPC(8): C22B13/00C22B3/12
CPCY02P10/20
Inventor 唐朝波唐谟堂陈永明杨建广何静杨声海黄潮
Owner CENT SOUTH UNIV
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