CN1080568A

CN1080568A - Flotation method for reducing content of iron and titanium impurities in bauxite

Info

Publication number: CN1080568A
Application number: CN 92105205
Authority: CN
Inventors: 黄利明; 扬井刚; 张宝丽; 曲立
Original assignee: Beijing General Research Institute of Mining and Metallurgy
Current assignee: Beijing General Research Institute of Mining and Metallurgy
Priority date: 1992-06-30
Filing date: 1992-06-30
Publication date: 1994-01-12
Anticipated expiration: 2007-06-30
Also published as: CN1029546C

Abstract

The present invention features that after sulfuric acid is used to clean the surface impurity of finely ground ore, Na is used to clean the surface impurity₂SiF₆As inhibitorsWith polyvalent metal cations, e.g. Cu⁺⁺、Pb⁺⁺、Fe⁺⁺、Ca⁺⁺When used as activator, styrene phosphonic acid is used as collector of fine-grain ferrotitanium impurity mineral to make the process flow of primary roughing, secondary concentration and tertiary scavenging, so that the titanium impurity in bauxite can be reduced to meet the requirement for producing high-grade aluminium refractory material.

Description

A kind of floatation that reduces ferrotitanium impurity content in the bauxite

The present invention relates to the beneficiation method of bauxite, particularly relate to a kind of floatation that reduces iron, titanium impurity content in the bauxite, be used for the processing of bauxite mineral.

Titanium impurity has a strong impact on the high-temperature behavior of refractory material in the bauxite, obtain high-quality refractory material, at first will remove iron, titanium impurity in the bauxite.Iron, titanium impurity mainly exist with mineral such as rutile, anatase, ilmenite, bloodstone in the bauxite, so these impurity might be removed by beneficiation method.But iron, titanium impurity is all with atomic fine granularity, is to contaminate the bauxite removal of impurities that evenly distributes of shape or disperse shape and become general election mine disaster topic.

The domestic report that has not yet to see iron, titanium impurity method in the relevant reduction bauxite.Abroad once reported and utilize the selective flocculation method to remove ferrotianium impurity in the bauxite.United States Patent (USP) 3.826.365 reported, and utilized multivalent metal cation to make activator, and high molecular polymer makes flocculant, when PH is 8.5-9, and titanium, iron tramp mineral are optionally flocculated.Then, make ore pulp remove ferrotitanium impurity floc sedimentation by intensity magnetic separator.This method, technology are comparatively complicated, and are difficult to remove non-magnetic impurity mineral such as rutile, anatase.

The present invention is intended to adopt simple effective method to remove ferrotianium impurity in the bauxite, satisfies the requirement of refractory industry to high-purity alum clay ore deposit.

Fig. 1 is an ore-dressing technique closed-circuit test flow chart of the present invention.

As shown in Figure 1, ore is milled to-0.038 millimeter with ball mill and accounts for 80%-95%, add the industrial concentrated sulfuric acid (concentration 84%) stirring and washing mineral surfaces impurity, add certain water gaging after, make that pulp density reaches 20～25%, pH value is about 4, place in the flotation cell, add Na₂SiF ₆And copper sulphate, stir, adding styryl phosphonic acid stirs again, add then foaming agent (such as terpenic oil, higher alcohols etc.) carry out flotation operation (or claiming to roughly select), obtain rough concentrate and thick mine tailing, then rough concentrate is adopted various medicaments and the similar interpolation method of roughly selecting, control its certain consumption and mixing time (see figure 1) and carry out again the 1st selected operation, obtain again the concentrate and tailings of primary cleaning, again 1 selected concentrate (adding as shown in Figure 1 medicament) is carried out the recleaning operation, can obtain ilmenite concentrate, the mine tailing of roughly selecting is scanned (operating condition and medicament addition are seen Fig. 1) operation through three times and is obtained except the titanium mine tailing, this mine tailing is as final products of the present invention, for the production of aluminous refractory.

The invention is characterized in the ore grinding, preliminary treatment, one roughing, the recleaning that comprise employing, scan technological process and operating condition three times:

1. ore grinding: because the disseminated grain size of ferrotianium impure mineral is very thin in the bauxite, must be through fine grinding, just can make the ferrotianium impure mineral reach necessary monomer dissociation, general mog need reach-0.038 millimeter and account for 80～95%, the best accounts for about 90% for-0.038 millimeter, and pulp density is 30～35%.

2. give processing: carry out pickling with sulfuric acid, clean mineral surfaces, strengthen the floatability difference of impure mineral and other mineral.Is 30～35% ore pulp with sulfuric acid with concentration, and transferring to pH value is about 2, stir 5-10 minute by force after, after the clear water dilution, dehydration makes pulp PH value about 4, concentration is between 20～25%.

3. roughly select: use Na ₂SiF ₆Make inhibitor, suppress diaspore and kaolinite, Na ₂SiF ₆Consumption be 200～600 gram/tons; Make activator with multivalent metal cation, activation iron, titanium impure mineral, activator level is 50～200 gram/tons.The metal ion that can make activator has: Cu ⁺⁺, Pb ⁺⁺, Fe ⁺⁺, Ca ⁺⁺Adding activator and inhibitor is in order to enlarge the floatability difference of impure mineral and bauxite, optionally to remove the ferrotitanium impure mineral to reach.

Make the collecting agent of particulate ferrotianium impure mineral with styryl phosphonic acid, the molecular formula of styryl phosphonic acid is:

After adding styryl phosphonic acid, stir more than 3 minutes, the longer the better for mixing time, and the consumption of this vinylphosphonic acid is 1500～2500 gram/tons, and the best is 2000 gram/tons.

4. selected: as in the concentrate of roughly selecting acquisition, to add Na ₂SiF ₆, that copper sulphate, styryl phosphonic acid and foaming agent (as the pine camphor wet goods) carry out the first time is selected, dosing is the 1/3-1/7 when roughly selecting, then the concentrate to primary cleaning carries out concentrate second time, condition and the selected basic identical (see figure 1) first time.

Processing technology of the present invention is simple, and is easy and simple to handle, and it is better to remove the ferrotianium effect, and processing cost is low, applicable to sorting of titaniferous, bauxite that iron is high.

Embodiment 1:

Contain TiO in the bauxite ore of Yangquan, Shanxi ₂2.8%, Fe ₂O ₃1.5%.Titanium mineral is microfine dip-dye shape or disperse shape and is scattered in the bauxite mainly with anatase, rutile etc., and average disseminated grain size is 3 microns.

To be milled to-0.038 millimeter to the ore deposit and account for 97%, and then ore pulp be fed in the tank diameter, and add 11 kilograms/ton sulfuric acid, strong agitation was carried out acid treatment in 10 minutes, and this moment, ore pulp PH was about 2.Dewater after adding the clear water dilution again, make ore pulp PH about 4, concentration is at 20-25%.Then ore pulp is fed in the tank diameter and size mixing, at first add prodan 375 gram/tons and copper sulphate 63 gram/tons and stirred 5 minutes, add collecting agent styryl phosphonic acid 250 gram/tons and foaming agent 36 gram/tons again, stir and roughly select after 5 minutes.Roughly select 7 minutes time.Roughly select the back and add prodan 230 gram/tons and copper sulphate 32 gram/tons, stir after 3 minutes, add styryl phosphonic acid 375 gram/tons and foaming agent (as terpenic oil, higher alcohols etc.) 8 gram/tons and carry out scanning the first time.Carry out behind the once purging selection scanning the second time, the condition of scanning is for the second time scanned identical with the first time.Roughly select and foam that twice selected is merged into concentrate, sweep that product is a true tailings in the groove for the second time.

Table 1 open-circuit test result

Name of product	Productive rate %	Ti0 ₂%	Fe ₂O ₃%
				Concentrate	53.44	3.53	2.10
Mine tailing	46.56	1.84	0.75
				Add up to	100.00	2.74	1.47

As adopt one roughing, and to scan for three times, the flow process of recleaning is carried out closed-circuit test, and the result is as follows for its closed-circuit test,

Table 2 closed-circuit test result

Name of product	Productive rate %	Ti0 ₂%	Fe ₂O ₃%
				Concentrate	19.80	6.50	4.32
Mine tailing	80.20	1.88	0.78
				Add up to	100.00	2.79	1.48

Claims

1, a kind of floatation that reduces iron in the bauxite, titanium impurity content, its inventive features is to comprise following technical process:

a。Ore grinding: account for 80%～95% to-0.038 millimeter with raw ore is levigate, pulp density is 30～35%;

b。Preliminary treatment: add the sulfuric acid cleaned mineral surfaces in ore pulp, making pulp PH value is 2, stirs after 5～10 minutes, and after the clear water dilution, it is between 20～25% that dehydration makes pulp density, and pH value is about 4;

c。Roughly select: pretreated ore pulp is added in the flotation cell, and in groove, add Na2SiF ₆, consumption is ore 200～600 grams per ton, adds copper sulphate or other metal ions such as Cu ⁺⁺, Pb ⁺⁺, Fe ⁺⁺, Ca ⁺⁺Make activator, consumption is ore 50～200 grams per ton, adds the collecting agent that styryl phosphonic acid is made particulate ferrotianium impure mineral, and consumption is that ore deposit per ton adds 1500～2500 grams;

d。Scan: in the mine tailing of roughly selecting the back acquisition, add Na2SiF ₆After the copper sulphate stirring, adding styryl phosphonic acid and foaming agent (as terpenic oil, higher alcohols etc.) carries out scanning the first time, carry out behind the once purging selection scanning the second time, scan for the second time condition and scan the first time identically, then scanned the gained mine tailing second time and scan for the third time;

e。Selected: as in the concentrate of roughly selecting acquisition, to add Na2SiF ₆, that copper sulphate, styryl phosphonic acid and foaming agent carry out the first time is selected, dosing is 1/3～1/7 when roughly selecting, it is selected then the concentrate of primary cleaning to be carried out second time, condition is selected basic identical with the first time.

2, floatation according to claim 1, its grinding particle size the best accounts for about 90% for-0.038 millimeter.

3, floatation according to claim 1, its styrene acid consumption the best of roughly selecting interpolation is ore 2000 grams per ton.