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Method for roasting hemimorphite and enriching zinc, lead and iron by utilizing pyrite

A technology for hemimorphite and pyrite, applied in the field of resources and environment, can solve the problems of large amount of leaching agent, many impurities, difficult recovery, etc., and achieves high lead-zinc sulfide conversion rate, high comprehensive recovery rate, and zinc-iron enrichment. high effect

Inactive Publication Date: 2016-12-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0002] Most of the lead-zinc oxide ores in my country are low-grade refractory ores, while hemimorphite Zn 4 Si 2 o 7 (OH) 2 (H 2 O) As a typical example of refractory smelting in oxidized ores, conventional wet leaching is mainly used at present. Wet leaching mainly includes acid leaching and alkali leaching. It is found through investigation that the effect of wet leaching process is not ideal and cannot fully reflect the application Requirements for effective comprehensive development of processes
The reason is: the silica gel produced during acid leaching is mixed with the recovered metal, it is difficult to separate the two, and the recovery is difficult; the alkali leaching is difficult to control the leaching liquid-solid ratio, the amount of leaching agent is large, the zinc concentration in the leaching liquid is low and there are many impurities. The leachate is difficult to handle and other reasons are difficult to popularize and apply; therefore, hemimorphite has not been well utilized, and its efficient utilization is an effective way to solve the current shortage of mineral resources

Method used

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  • Method for roasting hemimorphite and enriching zinc, lead and iron by utilizing pyrite
  • Method for roasting hemimorphite and enriching zinc, lead and iron by utilizing pyrite
  • Method for roasting hemimorphite and enriching zinc, lead and iron by utilizing pyrite

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Effect test

Embodiment 1

[0036] Example 1: Magnetic Separation-Flotation Test of Sulfidation Roasting of a Hemimorphite in Lanping, Yunnan

[0037] The main chemical composition of hemimorphite is: Zn 7.87%, Pb 6.94%, Fe 6.89%, Si 11.98%, Ca18.43%, of which Zn and Pb are mainly composed of Zn 4 Si 2 o 7 (OH) 2 h 2 O, PbCO 3 form exists. The experimental results show that the process is also effective for PbCO 3 It has better vulcanization effect.

[0038] (1) According to figure 1 According to the advanced technological process, the hemimorphite and pyrite are ground according to the mass ratio of 4:1, mixed evenly, and roasted at 900-950°C for 20-30min under the protection of nitrogen. The measured lead-zinc vulcanization rate is as high as 92% and 98%. %above. For XRD analysis of hemimorphite raw ore and sulfidation roasting products, see figure 2 .

[0039] (2) The vulcanization and roasting product is wet ball milled with water for 60-120 minutes, then ultrasonically dispersed for 20-3...

Embodiment 2

[0041] Example 2: Sulfidation Roasting Magnetic Separation-Flotation Test of a Hemimorphite in Guangxi

[0042] The chemical composition of hemimorphite is: Zn 16.23%, Fe4.64%, Pb 0.79%, Si 18.58%, Ca7.25%, among which zinc is mainly zinc silicate (Zn 2 SiO 4 ) and zinc silicate hydrate (Zn 4 Si 2 o 7 (OH) 2 h 2 O) exists.

[0043] (1) According to figure 1 According to the advanced technological process, the hemimorphite and pyrite are ground according to the mass ratio of 10:3 and mixed evenly. The temperature is controlled at 750-850°C, and the roasting time is 20-40min. The measured zinc vulcanization rate is as high as 95%. .

[0044] (2) Grind the vulcanized product first, add water and ultrasonically disperse it for 20-30 minutes, then adjust the liquid-solid ratio to 20:1, fully stir it into a slurry, and then directly perform magnetic separation. The magnetic field strength of the magnetic separation is 0.10-0.12T. Choose a time of 15 to 20 minutes. The measur...

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Abstract

The invention discloses a method for hemimorphite and enriching zinc, lead and iron by utilizing pyrite. The method comprises the following specific steps of: uniformly mixing hemimorphite and pyrite in certain proportion, and carrying out sulfidation roasting under protection of inert atmosphere for converting lead and zinc in the hemimorphite into sulfides, wherein a sulphuration rate of zinc is 92% or higher and a sulphuration rate of lead is 98% or higher; and converting iron in the pyrite into ferroferric oxide; enriching the ferroferric oxide in a product by magnetic separation, and recycling sulfides in magnetic separation tailings by floating. The method is simple to operate, can be used for sulfidation flotation recovery of lead and zinc in low-grade difficult-to-treat lead-zinc oxide ores, also can be used for recycling iron in hemimorphite and pyrite in the form of ferroferric oxide, and is also of great significance on comprehensive utilization of low-grade oxide ore resources.

Description

Technical field: [0001] The invention belongs to the technical field of resources and environment, and specifically relates to a method for utilizing pyrite sulfide-roasting hemimorphite to realize phase transformation of zinc-lead-iron, and then enriching zinc-lead-iron through magnetic separation-flotation steps. Background technique: [0002] Most of the lead-zinc oxide ores in my country are low-grade refractory ores, while hemimorphite Zn 4 Si 2 o 7 (OH) 2 (H 2 O) As a typical example of refractory smelting in oxidized ores, conventional wet leaching is mainly used at present. Wet leaching mainly includes acid leaching and alkali leaching. It is found through investigation that the effect of wet leaching process is not ideal and cannot fully reflect the application Requirements for effective comprehensive development of processes. The reason is: the silica gel produced during acid leaching is mixed with the recovered metal, it is difficult to separate the two, and ...

Claims

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Application Information

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IPC IPC(8): C22B1/06C22B19/02C22B13/00B03B7/00
CPCC22B1/06B03B7/00C22B13/00C22B19/02
Inventor 闵小波薛珂柯勇柴立元彭宁周波生
Owner CENT SOUTH UNIV
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