Method for recovering valuable metals by cooperatively disposing copper-nickel-cobalt smelting slag and gypsum slag

A valuable metal and co-processing technology, which is applied to the improvement of process efficiency and cement production, can solve the problems of low cost of natural gypsum mining, unstable quality of industrial by-product gypsum, and low comprehensive utilization rate of industrial by-product gypsum. Achieve the effects of improving kinetic mass transfer conditions, avoiding pollution, and strengthening the reaction process

Inactive Publication Date: 2015-03-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the unstable quality of industrial by-product gypsum and the low cost of mining natural gypsu...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Copper-nickel-cobalt smelting slag and gypsum slag co-processing to recover valuable metals, using 500g copper-cobalt sulfide ore flash blowing slag as raw material, its chemical composition is Cu 1.40%, Co 0.70%, Fe 38.73%, S 0.51% , SiO 2 24.19%, CaO 5.36%, Au 140g / t, Ag 230g / t. Put the smelting slag into the depleted electric furnace, turn on the electricity to raise the temperature and keep it at 1250°C; add 20% phosphogypsum (chemical composition is SO 3 38.92%, CaO 28.23%, SiO 2 4.31%, Al 2 o 3 0.88%, Fe 2 o 3 0.34%, P 2 o 5 1.21%) and 2% quartz sand (chemical composition SiO 2 92%, Fe 0.71%, CaO 0.25%, Al 2 o 3 3.53%, MgO 0.63%) after mixing and ball milling, together with 8% coke powder and nitrogen gas as the carrier, it is sprayed into the depleted electric furnace. After calculation, the recovery rates of copper, cobalt, gold and silver are 96.07%, 93.26%, 92.87% and 95.04% respectively.

Embodiment 2

[0034] Copper-nickel-cobalt smelting slag and gypsum slag are co-processed to recover valuable metals. 500g of high-cobalt matte blowing slag is used as raw material, and its chemical composition is Cu 1.21%, Co 1.25%, Ni 3.19%, Fe 45.09%, S 0.69%, SiO 2 26.73%, CaO 0.87%, Au 115g / t, Ag 380g / t. Put the blowing slag into the depleted electric furnace, turn on the electricity to raise the temperature and keep it at 1100°C; add 30% desulfurized gypsum (chemical composition is SO 3 41.12%, CaO 38.34%, SiO 23.83%, Al 2 o 3 0.65%, Fe 2 o 3 0.73%, MgO 0.43%) and 4% quartz sand (chemical composition SiO 2 92%, Fe 0.71%, CaO 0.25%, Al 2 o 3 3.53%, MgO 0.63%) after mixing and ball milling, and 18% coal powder are sprayed into the depleted electric furnace with nitrogen as the carrier, heat preservation and standing for 4.5h to produce copper-cobalt-nickel matte and depleted slag. After calculation, the recovery rates of copper, cobalt, nickel, gold and silver are 94.15%, ...

Embodiment 3

[0036] Copper-nickel-cobalt smelting slag and gypsum slag co-processing to recover valuable metals, using 1000g of laterite ore reduction smelting slag as raw material, its chemical composition is Ni 1.05%, Fe 33.03%, S 0.43%, SiO 2 30.57%, CaO 0.78%, Al 2 o 3 1.91%. Put the smelting slag into the depleted electric furnace, turn on the electricity to raise the temperature and keep it at 1300°C; add 15% citrate gypsum and fluorine gypsum 1:1 mixture (chemical composition is SO 3 40.50%, CaO 32.83%, SiO 2 1.38%, Al 2 o 3 1.04%, Fe 2 o 3 0.36%, CaF 2 2.27%) and 9% iron oxide concentrate (TFe 64.5%, SiO 2 5.26%, CaO 3.57%, Al 2 o 3 1.05%, S<0.1%, P<0.1%), after mixing and ball milling, together with 6% coke powder and nitrogen as a carrier, spray into the depleted electric furnace, keep warm and stand for 3 hours to produce nickel matte and depleted scum. After calculation, the nickel recovery rate is 90.25%.

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Abstract

The invention provides a method for recovering valuable metals by cooperatively disposing copper-nickel-cobalt smelting slag and gypsum slag. The method comprises: firstly adding solid or liquid copper-nickel-cobalt smelting slag into a slag-cleaning electric furnace, powering on for heating and constantly keeping a certain temperature scope, taking nitrogen as a carrier and spraying a reducing agent, the gypsum slag and a flux into the slag-cleaning electric furnace, so as to product a metal sulfonium phase and cleaned furnace slag through a reduction sulfuration reaction; and keeping warm, standing, sending the metal sulfonium phase to a fire-process blowing system through a siphon port for further recovering valuable metals, discharging the cleaned furnace slag from a slag discharge port and directly performing water quenching, so as to obtain the water-quenched slag which is applicable as a raw material for producing cement. By cooperatively disposing the copper-nickel-cobalt smelting slag and the industrial byproduct gypsum slag, efficient enriching recovery of copper, nickel, cobalt, gold, silver and other valuable metals in the smelting slag is realized, also an effective comprehensive utilization approach is provided for gypsum slag, and environmental pollution is avoided.

Description

technical field [0001] The invention provides a method for co-processing copper-nickel-cobalt smelting slag and gypsum slag to recover valuable metals, and belongs to the technical field of comprehensive utilization of metallurgy and industrial solid waste resources. Background technique [0002] Copper, cobalt, and nickel pyrometallurgical smelting process will produce a large amount of smelting slag, such as matte blowing slag, cobalt matte or nickel matte blowing slag, laterite or copper oxide ore reduction smelting slag, etc. These smelting slags contain valuable metals such as Cu, Co, Ni, Pb, Zn, Cd, Au, Ag, etc. If they are not comprehensively recycled, it will not only cause waste of resources, but also cause ecological environment pollution if they are stored for a long time in nature. [0003] The main components of copper-cobalt-nickel smelting slag are fayalite and a small amount of magnetite, and the contents of copper, nickel and cobalt in it are 1-10%, 0.5-4% a...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B15/00C22B11/00C22B23/00C04B7/147
CPCY02P10/20Y02P40/10
Inventor 陈永明唐朝波李云杨声海何静刘恒郭路路宣曹成
Owner CENT SOUTH UNIV
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