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A cleaning process for value-added utilization of pentlandite slag

A pyrite and process technology, applied in the field of cleaning processes, can solve the problems of poor environment and low comprehensive utilization rate, and achieve the effects of simple process flow, strong adaptability of raw materials and heavy pollution.

Active Publication Date: 2017-12-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at a series of defects such as poor environment and low comprehensive utilization rate in the existing pyrite slag treatment process, the purpose of the present invention is to provide a clean and environmentally friendly, high comprehensive recovery rate, short process flow, simple operation and low cost. A cleaning process for cleaning and recovering iron and nickel from pentlandite-containing slag; this process can effectively overcome the current situation of long process, low recovery rate and heavy pollution in the existing technology, and can realize cleaning from pentlandite-containing slag Recycling iron, nickel, etc., to achieve the purpose of energy saving, emission reduction, consumption reduction and value-added

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The composition of pentlandite cinder provided by a company in Hunan is: Fe 42.5%, Cu 0.9%, Zn 1.34%, Pb 1.1%, Ni 1.8%, Au 5.2g / t, Ag 122.4g / t, SiO 2 10.6%, of which the gold contents wrapped in sulfide state and silicate state are 2.1g / t and 0.9g / t respectively.

[0042] The anionic membrane used in the examples is prepared by a sol-gel method using tetramethoxysilane and N-trimethoxysilylpropyl-N,N,N-trimethylammonium chloride as precursors.

[0043] An example of the specific preparation process is: take 30g of tetramethoxysilane and 45g of N-trimethoxysilylpropyl-N,N,N-trimethylammonium chloride, add 90g of toluene as a solvent, and stir evenly Finally, add 3g of triisobutylaluminum and react at 25°C for 6h to obtain a polymeric sol of tetramethoxysilane and N-trimethoxysilylpropyl-N,N,N-trimethylammonium chloride , apply it to a fiberglass cloth support. Then put it into a vacuum drying oven, and dry at 30° C. for 12 hours to obtain an anion membrane.

[0044] ...

Embodiment 2

[0048] The composition of pyrite slag provided by a company in Guangxi is: Fe 38.1%, Cu 1.3%, Pb 2.4%, Ni 2.1%, Au 4.1g / t, Ag 158g / t, SiO 2 14.2%, of which the gold content wrapped in sulfide state and silicate state are 1.7g / t and 0.7g / t respectively.

[0049] Get above-mentioned pyrite slag 1000g, in FeCl 3 -Dissolve in the HCl system, the dissolution temperature is controlled at 50°C, and the pH value of the solution at the end of the dissolution is controlled at 2, Fe 3+ / (Fe 2+ +Fe 3+ ) = 0.08. Afterwards, separate by filtration, combine the washing liquid and the filtrate, dry and weigh the filter residue. Analysis of the iron, copper, lead, and nickel contents in the filtrate and filter residue showed that the leaching rates of iron, copper, lead, and nickel were all over 98%, and the gold contents wrapped in sulfide state and silicate state were reduced to 0.05g / t and 0.05g / t respectively. 0.09g / t, the enrichment rate of gold, silver, etc. in the slag is close to...

Embodiment 3

[0053] The composition of pyrite slag provided by a company in Hunan is: Fe 41.2%, Cu 1.1%, Pb 0.4%, Sn 2.1%, Ni 1.9%, Au 3.8g / t, Ag 171g / t, SiO 2 12.7%.

[0054] Get above-mentioned pyrite slag 2500g, in FeCl 3 - Leaching in HCl system, the dissolution temperature is controlled at 60°C, and the pH value of the solution at the end of dissolution is controlled at 1, Fe 3+ / (Fe 2+ +Fe 3+ ) = 0.1. Afterwards, separate by filtration, combine the washing liquid and the filtrate, dry and weigh the filter residue. Analyze the iron, copper, lead, tin, and nickel contents in the filtrate and filter residue, and the leaching rates of iron, copper, lead, tin, and nickel are all over 95%, and the enrichment rates of gold, silver, etc. in the residue are close to 100% .

[0055] The iron plate is used as the anode, the cathode is titanium plate, the effective area ratio of the anode and the cathode is 8:1, and the leaching solution is treated by means of "sacrificial" anode electric...

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Abstract

The invention discloses a cleaning process for value adding utilization of nickel-contained pyrite burning slag. The process firstly performs efficient leaching for the nickel-contained pyrite burning slag to obtain leaching liquid and leaching slag containing iron and nickel; and then, the sacrifice anode electric reinforcing reduction purification is performed for the leaching liquid, so that impurity elements in the leaching liquid are deeply reduced into reduction purification slag through an electric reinforcing reduction method. The process realizes the value adding utilization of the pyrite burning slag. A new technological process is a closed cycle, and a leaching agent can be recycled, so that the cleaning process preferably solves such problems as heavy pollution and low metal recovery rate generally generated in a traditional pyrite burning slag treatment process, is suitable for treating other various wastes containing iron and nickel, and has the prominent advantages of high adaptability to raw materials, simple technological process, high recovery rate of valuable elements, cleanness and environmental protection.

Description

technical field [0001] The invention relates to a cleaning process for value-added utilization of pentlandite slag, which belongs to the field of hydrometallurgy. Background technique [0002] Pyrite slag is industrial waste slag, which is produced from pyrite as raw material and is boiled and roasted to produce sulfuric acid. It is also called sulfuric acid slag, pyrite slag, and slag. [0003] The sulfuric acid produced by pyrite accounts for about 75% in my country, and usually 0.8 to 1 ton of cinder will be produced for every 1 ton of sulfuric acid produced, and the annual discharge of pyrite cinder is about 20 million tons. If such huge iron resources can be effectively utilized, it will be of great significance to alleviate the tight supply of iron ore in my country's iron and steel industry. The grade of foreign pyrite is generally high, the S content reaches 45%-50%, the total Fe content of the slag roasted by fluidized bed furnace is basically higher than 60%, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/24
CPCC25C1/24Y02P10/20
Inventor 杨建广吕元录史伟强李树超陈冰
Owner CENT SOUTH UNIV
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