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A method for combined treatment of acid leaching slag by separation and metallurgy

A combination of dressing and smelting, acid leaching slag technology, applied in the direction of improvement of process efficiency, etc., can solve the problems of high energy consumption of pyro-smelting process, low enrichment rate of flotation process, secondary pollution, etc., so as to achieve no secondary pollution secondary pollution, elimination of heavy metal pollution, and improvement of economic benefits

Active Publication Date: 2017-06-16
NORTHWEST RES INST OF MINING & METALLURGY INST
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Problems solved by technology

[0002] my country is currently the world's largest producer of non-ferrous metals. In 2014, my country's zinc output was 5.8269 million tons. According to 80% of the production of hydro-method zinc smelting enterprises, about 4.6 million tons of zinc was obtained by wet-method process, 100,000 t / year The annual production of acid leaching slag in the zinc hydrometallurgy system is about 35,000 tons, and the annual production of acid leaching slag in my country is about 1.61 million tons. According to the density of 2.5, it is about 644,000 m 3 Acid leaching slag is generated, and the annual construction needs to be about 210,000 m 2 Only a large slag yard can accommodate this kind of slag storage, which consumes a lot of money and land resources. The biggest problem is environmental protection. This kind of slag contains a lot of heavy metals, which is likely to cause serious environmental pollution incidents in extreme weather.
[0003] Acid leaching slag is the final slag obtained during hot acid leaching of zinc in wet smelting. The acid leaching slag contains 3.25-4.01% of valuable metals lead, 3.50-3.79% of zinc, 91-192g / t of silver, and 10-12% of sulfur. 7-12% iron, due to the complex occurrence state of its valuable metals and the difficulty in recycling, at present, domestic hydro-method zinc smelting enterprises basically use construction slag yards to stockpile, and the treatment process generally adopts a single flotation process or pyromelting process. The enrichment rate of the flotation process is low, and a large amount of flotation tailings are formed, resulting in secondary pollution; the pyro-smelting process consumes a lot of energy, and the sulfur dioxide flue gas formed is not easy to produce acid, and zinc, Some metals in lead cannot be used in secondary pyrotechnic slag

Method used

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  • A method for combined treatment of acid leaching slag by separation and metallurgy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Re-election: Put 100kg of acid leaching residue and water into a ball mill at a liquid-solid ratio of 1:1 for ball milling. After ball milling to -200 mesh accounting for 50%, add it to a drum-shaped dense medium separator for re-election. 2% ferrosilicon ore was added to the mixture, and the gravity separation time was 20 minutes to obtain heavy separation concentrate and light tailings. After the light tailings were thickened, the supernatant and silica sand were obtained. ;

[0019] (2) Acidification roasting-water washing-concentrated crystallization: mix 5% concentrated sulfuric acid into the concentrate and add it to the rotary kiln for roasting, control the roasting temperature at 700°C, roasting time for 2 hours, wash the obtained calcined sand with tap water, and wash the slag with a section of water Silver-rich lead slag and iron sulfate solution, iron sulfate solution and silver-rich lead slag are washed in two stages respectively, silver-rich lead slag i...

Embodiment 2

[0023] (1) Re-election: Put 100kg of acid leaching residue and water into the ball mill according to the liquid-solid ratio of 1:1 for ball milling. After ball milling to -200 mesh accounting for 80%, add it to the drum-shaped dense medium separator for re-election. 4% ferrosilicon ore was added to the mixture, and the gravity separation time was 50 minutes to obtain the gravity separation concentrate and light tailings. After the light tailings were dense, the supernatant and silica sand were obtained, and the gravity separation concentrate was dense to obtain the concentrate and supernatant. ;

[0024] (2) Acidification roasting-water washing-concentrated crystallization: mix 8% concentrated sulfuric acid into the concentrate and add it to the rotary kiln for roasting, control the roasting temperature at 900°C, roasting time 1.5h, wash the obtained calcined sand with tap water, and wash with water for a period of time Slag silver-rich lead slag and iron sulfate solution, iro...

Embodiment 3

[0028] (1) Re-election: Put 100kg of acid leaching residue and water into the ball mill according to the liquid-solid ratio of 1:1 for ball milling. After ball milling to -200 mesh accounting for 90%, add it to the drum-shaped dense medium separator for re-election. Add 5% ferrosilicon ore to the mixture, and the gravity separation time is 30 minutes to obtain the gravity separation concentrate and light tailings. After the light tailings are dense, the supernatant and silica sand are obtained. After the gravity separation concentrate is dense, the concentrate and supernatant are obtained. ;

[0029] (2) Acidification roasting-water washing-concentrated crystallization: mix 5% concentrated sulfuric acid into the concentrate and add it to the rotary kiln for roasting, control the roasting temperature at 1000°C, roasting time 1h, wash the obtained calcined sand with tap water, and wash the slag with a section of water Silver-rich lead slag and iron sulfate solution, iron sulfate...

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Abstract

The invention provides a method for treating acid leaching residues through a dressing-metallurgy combination method. The method for treating the acid leaching residues through the dressing-metallurgy combination method mainly comprises the following steps that the acid leaching residues are separated to obtain silica sand after ball milling and reselecting are conducted on the acid leaching residues; extraction and reverse extraction are conducted on supernatant to obtain a zinc sulfate solution, the zinc sulfate solution is sent back to a zinc smelting main system, and zinc is recovered; two stages of washing are conducted on zinc calcine after underflow is acidized and calcinated, and a zinc sulfate iron solution and a silver-rich lead concentrate are obtained; condensation and crystallization are carried out, and zinc-iron microelement fertilizer is obtained for sale; and the silver-rich lead concentrate can be sold to a pyrometallurgy lead smelting enterprise, lead bullion is obtained through pyrometallurgy, silver is concentrated to the lead bullion, the lead bullion is electrolyzed and refined to obtain electric lead, and the silver is concentrated into anode mud to be recovered. According to the method for treating the acid leaching residues through the dressing-metallurgy combination method, combination of beneficiation and metallurgy is used, valuable metal in the acid leaching residues is comprehensively recovered, the influences of long-term accumulation of the kind of acid leaching residues on the environment are eliminated, the process is clean and environment-friendly, secondary pollution is avoided, and signification is achieved on improving the circular economy benefits of the enterprise.

Description

technical field [0001] The invention belongs to the field of comprehensive recovery and utilization of secondary resources in non-ferrous metal smelting, and relates to the comprehensive recovery of lead, zinc, silver and iron metals in zinc acid leaching slag in hydrometallurgy and the resource utilization of process slag, and specifically relates to a combination of separation and smelting treatment of acid The method of leaching slag. Background technique [0002] my country is currently the world's largest producer of non-ferrous metals. In 2014, my country's zinc output was 5.8269 million tons. According to 80% of the production of hydro-method zinc smelting enterprises, about 4.6 million tons of zinc was obtained by wet-method process, 100,000 t / year The annual production of acid leaching slag in the zinc hydrometallurgy system is about 35,000 tons, and the annual production of acid leaching slag in my country is about 1.61 million tons. According to the density of 2.5,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B11/00C22B13/00C22B19/30
CPCY02P10/20
Inventor 鲁兴武陈一博李贵崔海瑞程亮李彦龙马爱军易超何国才李俞良薛莹莹纪武仁曹桂银
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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