| The inartificial rutile in which the TiO2 is great grade and the impurity is low, so it is the perfect material to produce titanic and sponge titanium.How to make the rutile ores to be well used, to break through in mineral processing methods is the key. The thesis summarized a great amount of literature about titanium processing and checked the flowsheet of the 200t/d gravity concentration in ShanXi ShangNan. In basis of them, the thesis carried out that the gravity flowsheet is not fit for processing the fine/micro-fine rutile ores and the floatation flowsheet is the best choice.In the thesis, the rutile mineral in ShanXi ShangNan is made to be as a research object,why it is difficult to concentrate is analysed in basis of the study of the process mineralogy. The single mineral floatation experiment and the dispersion experiments for the single mineral of rutile, chlorite, plagioclase and the mixedture of them have carried on. the basic condition of floating the rutile has been gained. In basis of them, with the fine/micro-fine rutile ores, the research of the distribution floatation theoretic which "redirect float sliming after depressing the rutile, in following, direct float the rutile which be activated" is carried out.the experiment basis is that:Using Al2 (SO4)3, the rutile can be depressed but the chlorite and the plagioclase will be activated. Pb(NO3)2can activate the rutile which be depressed by Al2(SO4)3, RCONHONa can float the rutile which be activated by Pb(NO3)2. Under the alkaline condition, there. are some Al2(SO4)3 in the system, The rutile will be dispersive but the chlorite and the plagioclase will be agglomerate if sodium oleate is acceded to the mixedture system.After the distribution floatation theoretic have been carried out, which is set out from the actual mineral's investigate experiment, the distribution floatation flowsheet research has been carried on.In the process, comparing the direct floatation with the distribution floatation, making the experiment with other typical mineral kinds, the characteristics of the distribution floatation flowsheet is outstanding. In basis of the technological research, the theoretic research is studied.the main contents and the results are that:(1) In the actual mineral's investigate experiment, Al2(SO4)3is used to depress the rutile, the collectors-sodium oleate is used to redirect float the gangue minerals, then Pb(NO3)2can be used to activate the rutile which be depressed by Al2(SO4)3, RCONHONa can float the rutile. the rough concentrate grade is 18.76%, the recovery is 81.52%,as well as the slime in -0.010mm can be slimed about 74.79% by redirect floatation. It can explain that it is reasonable and viable to concentrate the rutile ores in the flowsheet of the distribution floatation.(2) When Al2(SO4)3 is used to depress the rutile and the collectors -sodium oleate is used to redirect float the gangue minerals, with jioning the sodium oleate by starvation reagent feeding, The foam can polished 31.41% by redirect floatation. The grade of the rutile in the foam is 0.38%, the lost rate is only 6.12%. The grade of the rutile in the trough is up to 2.67% from 1.96%.(3) After being redirect floated, make the pH=8.5 using Na2CO3, depress the gangue minerals using the combination of CMC and Na2SiF6, activate the rutile using Pb(NO3)2, the collectors RCONHONa and C6H5CH2AsO3H2, one-floatation the rough concentrate grade is 20.30%, the recovery is 83.88%. In this flowsheet, the rutile's recovery is high and the enrichment ratio is also high.(4) comparing with the direct floatation, the distribution floatation flowsheet is the better in the floatation index and floatation rate, The characteristic is that:a. The rutile's enrichment ratio, its recovery and its floatation rate are all increased.b. In the redirect floatation processing, the sliming rate is good. It makes the condition for the rutile's direct floatation. It is good for the great floatation index.c. With jioning the sodium oleate by starvation reagent feeding, the polishing foam is about 30%, but the lost rate of the rutile is low.d. The reagent system is simple, but it achieves the pre-concentration polishing and sliming. As the same time, the reagent consumption is reduced in direct floatation the rutile.e. The effect of Al2(SO4)3 in processing is great that:the Al2(SO4)3 is used for depressing the rutile and activating the silicate gangue in redirect floatation processing. In the direct floatation process, the remanent Al2(SO4)3 in company with Na2SiF6 and CMC get the good floatation index and rate.(5) The good index is also gained in the test research of the rutile in which the distribution floatation was used in HaNan FangCheng and ShanXi AnKang. It shows that the distribution floatation is worth for processing the fine /micro-fine rutile in our country and has the great theoretics meaning and application value.(6) After one roughing, one scavenging and two contentrating, the rough concentrate with the grade 48.13%, the recovery 80.76% can be gained. The eligibility concentrate is not gained by the distribution floatation flowsheet, but the rutile's enrichment ratio and its recovery are both increased, the sliming foam is about 30%. So the distribution floatation can be the roughing flowsheet of the rutile.(7) In pH=8.5, Al3+is being in form of Al(OH)- in liquor, Ti-OH will bring about the chemical reaction with Al(OH)3 because of its activity. Ti-O-Al is gained to hide Ti and Al(OH)3 in surface layer of the rutile. The rutile is depressed by its surface layers strong hydrophilicity. The chlorite and the plagioclase are activated by the specific adsorption of Al3+. After the Pb(NO3)2 is jioned the rutile which has been depressed, Pb2+replace Al3+ to make a new coordination with Ti4+, the new chemisorption is being in the surface layer by Pb2+. Because of it, The action of the titanium particle and the collector becomes obviously strong, The rutile becomes easily activated.(8) In the basis of EDLVO theory, in alkaline condition, there are some Al2 (SO4)3 in the system, the chlorite and plagioclase bring about the agglomerate, but the rutile is dispersive. The result is that in the processing of redirect floating the silicate gangue while depressing the rutile. The sodium oleate can also be used to float the slime which is agglomerate. It is the use of sliming by redirect floatation.(9) In the basis of the before-mentioned distribution floatation theoretic and technological research, the pilot test which is in the method of the distribution floatation was researched to concentrate the rutile. The result shows that:about 12.88% is polishing by the high-frequency fine screen in the processing of selective grinding, redirect floatation sliming 27.61%. Only about 59.51% is jioned in the processing, the grade of the rutile in the through is up to 3.01% from 1.96%. The cost is quitely decreased. After one roughing, one scavenging and two concentrate, the rough concentrate with the grade 48.5%, the recovery 80.19% can be gained. In count of the 200t/d flowsheet, the concentrate one is that the grade is 92.23%, the recovery is 43.10%, the concentrate two is that the grade is 85.12%, the recovery is 24.40%. the general recovery is 67.50%, comparing with the old 200t/d gravity flowsheet, the recovery increased 26.04% as well as the grade is same. The pilot test shows that the distribution floatation flowsheet has great application value in production of developing the rutile in ShanXi ShangNan.The distribution floatation theoretic which "redirect float sliming after depressing the rutile, in following, then direct float the rutile which be activated" are carried out In the premise of making sure the low lost, the efficacious polishing and sliming is achieved, the rutile's floatation index and rate are increased, the reagent consumption is reduced in direct floatation the rutile. The flowsheet has some innovation in the theory and the practice. The dimensions of the pilot test is up to 1.5t/h and the floatation index is all right. It shows that the research has the precursor in concentrating the rutile ores. The main products are that:(1) the culling grinding'using:there're large numbers of sheet gangue minerals. The culling grinding is distinct. The steel rod is used as grinding medium in the pilot test. About 12.88% is thrown away by the high-frequency fine screen in the processing of the culling grinding. The rutile's lost rate is low.(2) Because of the use of the distribution floatation flowsheet, the efficiency sliming is gained in redirect floatation the fine/micro-fine rutile:The sliming rate is high and the lost of rutile is low in redirect floatation processing, which can supply a new blinkered for processing the fine/micro-fine rutile.(3) The sodium oleate's selectivity is increased as a result of jioning the sodium oleate by starvation reagent feeding and using to detract the air bubble. The sodium oleate's collecting power is strong but its selectivity power is not strong. it has frothing capability but its power is not stabilization. by starvation reagent feeding and joining oil No.2, the dispersion becomes better and the selectivity power becomes stronger. It is showed in the low lost rate of the rutile which has been gained in redirect floatation.(4) The floatation reagents'reasonable choice and the combination use:The effect of Al2 (SO4)3 in the distribution floatation processing is great. It is used for depressing the rutile and activating the silicate gangue in redirect floatation processing. In the direct floatation process, the remanent Al(SO4)3 in company with Na2SiF6 and CMC get the good floatation index and rate. RCONHONa is used for the main collectors and the rutile's floatation in alkaline condition has been gained. |
