CN1632141A - Method for acid ammonia extraction of zinc from high silicon high iron low grade zinc oxide ore - Google Patents

Abstract

A method for acid ammonia extraction of zinc from high silicon high iron low grade zinc oxide ore is characterized in that said method comprises (1) grinding to obtaion mineral powder, then (2) adding acids to the mineral powder at normal temperature for a conversion, and (3) adding alkalis or calcarea lime for a neutralization, and (4) adding ammonia therein for a leaching, and (5) liquid solid separating, and (6) obtaining a manipulation solution containing 100-150g/L Zn after multistage leaching, and then (7) after routine fine purification, electrolyzing them into zinc ingots or preparing zinc oxide products. Said method resolves the existing technological difficult problems that it is difficult to filtrate through acid method due to generation of silica gel and the recovery rate is low through ammonia process leaching, and is characterized by the following points: without silica gel generation, it is easy to filtrate; the zincic leach recovery rate is high, equal to or higher than 80%, yielding good economic returns; high silicon high iron low grade zinc oxide ores containing SiO2 higher than 30%, Fe higher than 10% and Zn higher than 10% can be thoroughly utilized, turning rubbish into treasure.

Description

The acid-ammonia extraction of high silicon high iron low grade zinc oxide ore zinc

The present invention relates to the leaching novel method of high silicon high iron low grade zinc oxide ore zinc.

The leaching of existing high silicon high iron low grade zinc oxide ore zinc has acid system and ammonia process, adopts acid system, stripping when silicon-dioxide leaches at ore, produce silicic acid and become the silicon gel, when causing zinc sulfate from ore pulp, to separate, filtration difficulty, make and contain silicon-dioxide and can't carry out industrial production greater than 20% zinc oxide ore, and the acid system of external usefulness, technical process is tediously long, the equipment complexity, and need to add a large amount of Tai-Ace S 150 cohesion silicic acid, cost height; Adopt ammonia process then to leach the rate of recovery and only be 7.15%-12%, leaching yield is low, and is of poor benefits, do not reach the industrial production requirement.

The object of the present invention is to provide a kind of silica gel that do not generate, be easy to filter the acid-ammonia extraction of the high silicon high iron low grade zinc oxide ore zinc that leaching yield is high.

The present invention adopts following manner to achieve the goal:

This acid-ammonia extraction is:

(1) ore grinding gets breeze;

(2) breeze normal temperature adds the acid conversion;

(3) add the neutralization of alkali or lime

(4) ammonification lixiviate;

(5) liquid-solid separation;

(6) must contain Zn100-150g/l operation liquid through the multistage lixiviate;

(7) after routine purifies, send and be electrolyzed to produce zinc ingot metal or produce zinc oxide.

Characteristics of the present invention: the one, do not generate silica gel, be easy to filter; The 2nd, the leaching rate of recovery height of zinc is equal to or higher than 80%, and is good in economic efficiency; The 3rd, contain sio ₂＞30%, Fe＞10%, the high silicon high iron low grade zinc oxide ore of Zn＞10% can be fully used, and turns waste into wealth.

Non-limiting examples of the present invention:

The acid-ammonia extraction of example 1 high silicon high iron low grade zinc oxide ore zinc:

This acid-ammonia extraction is:

(1) ore grinding is milled to 60-200 order＞75% with ball mill;

(2) under the normal temperature breeze with filtering the wash heat water (original ore powder: water=1: 0.1-1) of in steel basin, sizing mixing, under agitation add industrial sulphuric acid again, the acid amount of adding is that breeze contains 1-3 that Zn, Ca, Fe consume sour theoretical amount doubly, stir under the sulfuric acid self-heating 1h (hour) more than;

(3) add the neutralization of alkali or lime, under agitation add milk of lime, make PH＞1, and feed more than the pressurized air stirring 1h, place more than the 6h;

(4) ammonification lixiviate under agitation adds solid-to-liquid ratio 1: 2-3 and drops into waste electrolyte or combination liquid, or reclaims ammoniacal liquor combination liquid in leaching vat, and adding the ammonia amount is [Zn (NH ₃) ₄] ^{+ 2}The 1-3 of amount times, not enough number is supplied by feeding liquefied ammonia and (is contained NH as producing electrolytic zinc with the combination ammoniacal liquor ₄The Cl3-6 mole; Combination ammoniacal liquor as oxygenerating zinc contains NH ₄HCO ₃The 4-7 mole);

(5) liquid-solid separation, supernatant liquor is directly discharged in the groove, and slag inclusion liquid filters through pressure filter;

(6) go out to contain the operation liquid (or claiming rich zinc liquid) of Zn100-150g/l through the multistage lixiviate, supernatant liquor and pressing filtering liquid are joined in the material of second groove that added milk of lime, PH 〉=7.5, again through the ammonification lixiviate, liquid-solid separation, get supernatant liquor and pressing filtering liquid, so circulation, the zinc liquid through extracted many times goes out just can reach the operation liquid that contains Zn100-150g/l;

(7) operation liquid send electrolysis system zinc ingot metal after routine purifies, or send the oxygenerating zinc product.

Claims (2)

1, a kind of acid-ammonia extraction of high silicon high iron low grade zinc oxide ore zinc is characterized in that this method is:

(1) ore grinding gets breeze;

(2) breeze normal temperature adds the acid conversion;

(3) add the neutralization of alkali or lime;

(4) ammonification lixiviate;

(5) liquid-solid separation;

(6) must contain Zn100-150g/l operation liquid through the multistage lixiviate;

(7) after routine purifies, send and be electrolyzed to produce zinc ingot metal or produce zinc oxide.

2, the acid-ammonia extraction of the basic described high silicon high iron low grade zinc oxide ore of claim 1 zinc is characterized in that this method concrete operations method is:

(1) ore grinding is milled to 60-200 order＞75% with ball mill;

(2) under the normal temperature breeze with filtering the wash heat water (original ore powder: water=1: 0.1-1) of in steel basin, sizing mixing, under agitation add industrial sulphuric acid again, the acid amount of adding is that breeze contains 1-3 that Zn, Ca, Fe consume sour theoretical amount doubly, stir under the sulfuric acid self-heating 1h (hour) more than;

(3) add the neutralization of alkali or lime, under agitation add milk of lime, make PH＞1, and feed more than the pressurized air stirring 1h, place more than the 6h;

(4) ammonification lixiviate under agitation adds solid-to-liquid ratio 1: 2-3 and drops into waste electrolyte or combination liquid, or reclaims ammoniacal liquor combination liquid in leaching vat, and adding the ammonia amount is [Zn (NH ₃) ₄] ^{+ 2}The 1-3 of amount times, not enough number is supplied by feeding liquefied ammonia and (is contained NH as producing electrolytic zinc with the combination ammoniacal liquor ₄The Cl3-6 mole; Combination ammoniacal liquor as oxygenerating zinc contains NH ₄HCO ₃The 4-7 mole);

(5) liquid-solid separation, supernatant liquor is directly discharged in the groove, and slag inclusion liquid filters through pressure filter;

(6) go out to contain the operation liquid (or claiming rich zinc liquid) of Zn100-150g/l through the multistage lixiviate, supernatant liquor and pressing filtering liquid are joined in the material of second groove that added milk of lime, PH 〉=7.5, again through the ammonification lixiviate, liquid-solid separation, get supernatant liquor and pressing filtering liquid, so circulation, the zinc liquid through extracted many times goes out just can reach the operation liquid that contains Zn100-150g/l;

(7) operation liquid send electrolysis system zinc ingot metal after routine purifies, or send the oxygenerating zinc product.