CN101451195A

CN101451195A - Technology process of extracting copper from copper oxide ore

Info

Publication number: CN101451195A
Application number: CNA200710171670XA
Authority: CN
Inventors: 孙华信
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-12-03
Filing date: 2007-12-03
Publication date: 2009-06-10

Abstract

Cupric oxide is an important composition of copper ore resources. Because the cupric oxide is difficult in ore dressing, a plurality of cupric oxide ores including large, medium and small-size oxidized and vulcanized mixed copper ores with lower grade and complex compositions are not rationally exploited. The invention solves a plurality of problems during exploitation of the cupric oxide ores. A solvent used is neutral, has extremely high efficiency in dissolving the cupric oxide, is nontoxic, harmless and pollution-free, and does not chemically react with elements such as calcium, magnesium and iron. The method is simple and convenient to operate, can dissolve more than 90 percent of the cupric oxide in the ores by crushing or grinding the ores into proper granularity, loading the ores into a special container and adding the solvent for circulating infiltration or stirring leaching, and reduces copper ions in the solution into 'electrolytic copper' through 'electrodeposition'. The price of the solvent is lower, and the commodity supply is sufficient; and the economic benefit, the resource benefit and the environmental benefit are all high.

Description

From contain copper oxide ore, extract the processing method of copper

Oxidized ore is the important component part of copper ore resource, accounts for more than 1/3 of total amount.Oxidized ore is owing to exist certain difficulty aspect the selected enrichment, dosage is big in the ore dressing, and the rate of recovery is low, the cost of winning height, and therefore many oxidized ores comprise that those grades are lower, composition is complicated " oxidation of sulfureted " mixes the ore deposit, do not obtain rational exploitation and utilization as yet.

The invention solves the many difficult problems in the oxidized ore exploitation.Solvent for use is neutral, nontoxic, harmless, pollution-free, three-waste free discharge.Copper-bearing minerals such as a solvent dissolved oxygen copper, native copper, brass not with multiple element generation chemical reactions such as calcium, magnesium, iron, but can not dissolve cupric sulfide.

The extraction of cupric oxide is divided into leaches and two processes of reduction.

(1) leaches and to soak and stir two kinds of forms with the pond.

1, soak in the pond: ore is crushed to suitable particle size (puts into rectangle soaking pit (as figure) as 0.2～4mm).Solvent is put into opening for feed successively by 3～5 times of consumptions of ore copper content, add that water cycle is molten and soak (adding water for the first time must pour in down a chimney).Solution usage and ore in sand form volume ratio 1:1.When leach liquor cupric concentration reaches 1.5g/1 when above, just can send electrodeposition workshop electrodeposition to get copper through precipitation.Add soaking pit with clear water or electrodeposition tail washings (hereinafter to be referred as tail washings) and continue molten the soaking of circulation ... up to the cupric oxide in the pond is molten most, copper concentration is till below the 0.3g/1.

Every pond should be able to be leached the cupric oxide more than 90% about 10 days as adorning 200～800T ore in sand form.Leaching velocity and ore grain size, ore grade, electrodeposition efficient, strength of solution, circulation, ventilative etc. all multifactor relevant.So-called " breathing freely " is exactly every day 1～2 time the solution in the pond all to be drained, and then opens that the valve feed liquor is molten to be soaked and circulate.

2, agitation leach: this technology is used for " oxidation, sulfuration " mixed copper ore.

Earlier ore is worn into 200 purpose fine sands, the special container that threading can be stirred, solvent is put into by 3～5 times of consumptions of ore in sand form cupric, the water that adds ore in sand form volume 1/2～2/3 stirs and becomes pasty state half an hour, slaking 1～2 hour adds the water or the tail washings continuously stirring of 1～2 times of mineral aggregate volume, when leach liquor copper concentration reaches 1.5g/1 when above, solid-liquid separation, leach liquor send the electrodeposition workshop to get copper; Add tail washings and continue to stir, copper concentration reaches 1.5g/1 when above, solid-liquid separation ...

Test slag: when cupric oxide content was reduced to no utility value, the washing ore in sand form was sent into next program " flotation ", extracts cupric sulfide.

The cycle of agitation leach, it was crucial fully effectively stirring about 6～20 hours.Can be designed to full-automatic or semi-automatic production line.Develop, manage with delicacy and to shorten the time diligently, raise the efficiency.

(2) reduction: copper-containing solution is reduced into copper powder through electrodeposition.

Equipment is identical with potroom, just will regularly shut down and get copper, can clean copper powder with 0.1～1% dilute hydrochloric acid solution, dries vacuum-drying again.

This processing method is operated at normal temperatures and pressures, as long as there is water to exist, produces and just can carry out.Solvent for use is the carbon ammonium, does not need any additives.The carbon ammonium has another name called bicarbonate of ammonia, is a kind of nitrogenous fertilizer that small-sized fertilizer plant produces.Cheap, the resource abundance.Auxiliary agent is a sodium bicarbonate, is used in the electrodeposition workshop.Slack-off when electrodeposition speed, when electrolytic deposition process is difficult to proceed, in Winning cell, add a little sodium hydrogen carbonate solutions, the electrodeposition program will be recovered as before, and tail washings concentration can be reduced to 0.1g/1.Improved the transporting capacity of solvent greatly.

Requirement to ore is: sulphur content is unsuitable too high.If it is acid that the infusion of ore in sand form is, perhaps have the solid sulphur powder to exist, then must desulfurization after molten again soaking.

Accompanying drawing is (cupric oxide) ore soaking pit sketch.Opening for feed is the place, colvent inlet.

Claims

From contain copper oxide ore, extract the processing method of copper, it is characterized in that:

1, ore is pulverized or be milled down to suitable particle size, the container of packing into molten the soaking or agitation leach of dedicated solvent circulation, makes that the cupric oxide 90% or more is dissolved out in the ore, passes through " electrodeposition " again, and the cupric ion in the solution is reduced into " electrolytic copper ".
2, solvent for use is " a carbon ammonium ", does not need any additives.Ore grade difference, solvent-oil ratio are also different.

Contained in the ore " copper " is 1:3～5 with the ratio of solvent,

Solution and ore in sand form volume ratio are 1:1

Auxiliary agent " sodium bicarbonate " is with helping cupric ion reduction, and consumption is few, no fixed proportion, but can not completely without.
3, this solvent is neutral, and is nontoxic, harmless, pollution-free, and not with element generation chemical reactions such as calcium, magnesium, iron.Price is lower, and economic benefit, economy of resources and environmental benefit are all very high.