A method for processing low-content non-ferrous metal materials to extract non-ferrous metals

A non-ferrous metal, low-content technology, applied in the direction of improving process efficiency, etc., can solve the problem of unsatisfactory economy, ecology, high efficiency and comprehensiveness, refractory mineral resources and secondary resources, rich and diverse resource sources and uncertainties and other problems, to achieve the effect of reducing the cost of tail gas treatment, high utilization rate of heat energy, and reducing the load of tail gas treatment

Inactive Publication Date: 2011-12-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Low-grade refractory mineral resources and secondary resources have the characteristics of low content of valuable metals, rich and diverse sources of resources and uncertainties, complex components and large content fluctuations, etc., resulting in the existing classical metallurgical methods unable to meet the requirements for processing such materials Basic requirements in terms of economy, ecology, efficiency and comprehensiveness

Method used

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  • A method for processing low-content non-ferrous metal materials to extract non-ferrous metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] High temperature chlorination volatilization roasting of pyrite slag:

[0055] The content (%) of valuable metals in the slag is: Cu 0.40-0.50; Pb 0.15-0.20; Zn 0.55-0.65; Ag 30-40g / ton.

[0056] The slag is ground and dried with hot tail gas (250-300°C; 30min), and processed into a mineral material with a water content of not higher than 10% and a particle size of -60 mesh; the kiln is preheated to 500°C with hot tail gas; 4~5% CaCl in slag 2 Preheat to 500°C with scorching flue gas; hot ore and hot CaCl 2 At the same time into the rotary kiln (length-to-diameter ratio 12), pulverized coal as fuel, oxygen-enriched (preheated to 500 ℃) combustion-supporting high-temperature chlorination roasting; chlorination roasting temperature 1000-1050 ℃, time 40min; roasting flue gas After cooling, Dust collection and absorption, recovery of valuable metals.

[0057] The volatilization rate (%) of each valuable element is: Cu 91.4; Pb 96.1; Zn 97.6; Ag 95.5. The capture recover...

Embodiment 2

[0059] Chloride volatilization roasting of low-grade tin ore:

[0060] The valuable metal content (%) of tin ore is: Sn 1.4~2.0; Pb 2.0~4.0; Zn 1.0~1.5;

[0061] The tin ore is ground and passed through a 60-mesh sieve; mixed with 10-12% quartz powder (-60 mesh), dried until the water content is less than 10%, and preheated to 800°C. Take 5~6% CaCl based on the amount of tin ore 2 , 4-5% pulverized coal, mixed and preheated to 800°C; hot materials are put into the rotary kiln for mixing and chlorination roasting; pulverized coal is used as fuel, oxygen-enriched (preheated to 800°C) to support combustion; chlorination roasting Temperature 1000~1050℃, time 60min; control the pressure ratio CO / CO in the furnace gas 2 is 0.5, the flue gas is cooled, settled and wet dust collected to recover valuable metals.

[0062] The volatilization rate (%) of each valuable element is: Sn 96.2; Pb 94.4; Zn 71.6; the capture recovery rate (%) of each valuable element is: Sn 94.9; Pb 93.4; Zn ...

Embodiment 3

[0064] Chlorination and volatilization roasting of bismuth-poor complex ore

[0065] The main components of poor bismuth ore (%): Bi 0.2 ~ 0.4; SiO 2 35~45; CaO 10~15; S 10~15.

[0066] Grinded (-60 mesh) bismuth-depleted ore is dried with hot tail gas (250-300°C; 30min) until the water content is not higher than 10%; it is preheated to 650°C with glowing tail gas when entering the kiln; it will be calculated as dry ore 5~6%CaCl 2 Preheat to 650°C with scorching flue gas; hot ore and hot CaCl 2 At the same time, it enters the rotary kiln (length-to-diameter ratio 12), uses pulverized coal as fuel, and carries out chlorination roasting with oxygen-enriched combustion; chlorination roasting temperature is 800-850°C, and the time is 50 minutes; the flue gas is cooled, dust is collected, and bismuth is recovered.

[0067] The volatilization rate of bismuth is 93.7%; the capture recovery rate (%) is 91.6%.

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Abstract

The invention discloses a method for processing low-content non-ferrous metal materials to extract non-ferrous metals: (1) pretreatment: processing the low-content non-ferrous metal materials into powder materials with a water content not higher than 10% and a particle size of -60 mesh; ( 2) Preheating: Preheat the mixture of reducing agent and chlorinating agent and low-content non-ferrous metal materials to 500-800°C respectively; (3) High-temperature chlorination roasting: add to the preheated low-content non-ferrous metal materials 0~6wt% reducing agent and 4~10wt% chlorinating agent, carry out the chlorination roasting of valuable metals; roasting temperature 800~1100 ℃, roasting time 30~60min; (4) Valuable metal chloride capture recovery: chlorine After the high-temperature flue gas from chemical roasting is collected to remove mineral dust, it is cooled and wet-type collected to recover valuable metal chlorides. The economical and efficient extraction of valuable metals in low-content nonferrous metal materials is realized.

Description

technical field [0001] The invention relates to a method for extracting valuable metals from complex materials with low content of nonferrous metals, belonging to the field of nonferrous metallurgy. Background technique [0002] At present, the annual output of major metal materials in my country ranks first in the world. The huge production scale of metal materials has accelerated the depletion of non-renewable mineral resources while meeting the strong demand for metal materials; the contradiction between the serious shortage of natural mineral resources and the growth of demand for metal materials has become increasingly prominent. [0003] In order to solve the increasingly serious problem of resource shortage, my country vigorously promotes investment in overseas mineral resources and relies on mineral imports to alleviate resource shortage. At the same time, rely on technological progress to deal with low-grade refractory mineral resources; vigorously develop secondar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/08C22B7/00
CPCY02P10/20
Inventor 胡启阳李新海王志兴郭华军彭文杰
Owner CENT SOUTH UNIV
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