CN1149005A

CN1149005A - Iron and titanium removing process for coal series hard kaolinite by magnetic method

Info

Publication number: CN1149005A
Application number: CN 96109831
Authority: CN
Inventors: 郑水林; 杜玉成; 李杨; 夏巧玲; 邢东海
Original assignee: BEIJING GRADUATE STUDENT DEPARTMENT WUHAN POLYTECHNICAL UNIV
Current assignee: BEIJING GRADUATE STUDENT DEPARTMENT WUHAN POLYTECHNICAL UNIV
Priority date: 1996-09-19
Filing date: 1996-09-19
Publication date: 1997-05-07
Anticipated expiration: 2016-09-19
Also published as: CN1057943C

Abstract

A process for magnetically removing Fe and Ti from coal-measure hard kaolinite ore includes crushing said hard kaolinite ore, water grinding to obtain slurry containing water content of 60% and particles less than 30 microns, middle-speed stirring for 5-15 min while adding disperser which may be sodium pyrophosphate, sodium metaphosphate or water glass, regulating Ph value to 5-8, addition of artificial or natural magnetic seeds, strong stirring for 2-5 min, and magnetic separation under action of magnetic field (1-1.8 Teslas) for 2-40 seconds in high-gradient magnetic separator. The contents of Fe2O3 and TiO2 are reduced respectively by 40-50% and more than 40%.

Description

Coal series hard kaolinite by magnetic method deironing, titanium technology

The present invention is a kind of coal series hard kaolinite by magnetic method deironing, titanium technology, belongs to Mineral Processing Engineering.

Coal series hard kaolinite is a kind of and the aluminium silicate mineral coal symbiosis, be present in the coal measure strata, have for the base plate in coal seam or top board, what also have is clipped in the coal seam, be dirt band and exist, these ores generally contain kaolinite more than 90%, pair product in the normally coal mining process, get through picking, also can exploit separately.The Raolinite raw ore can obtain papermaking through coarse crushing, in small, broken bits, purification, calcining, ultra-fine grinding etc., and high-grade filler or pigment that coating, plastics, rubber industry are used have good development prospect.But because ubiquity Fe in the coal series kaolin rock ₂O ₃, TiO ₂Composition influences the whiteness of final products, and has limited the extensive use of this resource, therefore, how to remove the Fe in the coal series kaolin rock effectively ₂O ₃, TiO ₂Impurity becomes the key problem in technology problem of this area.Be generally limonite with iron, the titanium mineral of coal series hard kaolinite symbiosis; bloodstone; pyrite; weak magnetic such as ilmenite or nonmagnetic mineral; and its iron, titanium mineral are microfine more or contaminate shape embedding cloth; adopt conventional ore dressing method of purification,, can't capture iron, titanium mineral effectively as classification, gravity treatment, magnetic separation, flotation etc.

Task of the present invention is the problem at above-mentioned coal series hard kaolinite deironing, titanium difficulty, according to electrochemical theory, regulate desire and remove the surface electrical behavior of purpose mineral, add the microfine magnetic seeds, by physics and the chemical action of itself, the magnetic kind is optionally adhered on the purpose mineral surfaces of desire removal, improve its magnetic, adopt magnetic selection method to be separated then, the high magnetic method deironing of a kind of efficient, titanium technology are provided.

Before narration the present invention, earlier that the concept explanation of zero point that the present invention mentioned and magnetic kind is as follows:

Zero point, have potential difference between mineral surfaces and the solution in the ore pulp, be called surface potential again, the concentration of location ion is closely related in its current potential φ 0 and the solution, the negative logarithm of locating ion concentration when φ 0 is zero in the solution is zero point (representing with PZC), is H as the location ion ⁺Or OH ^-The pH value of solution was exactly a zero point when then φ 0 was zero, under this PH condition, the charge density of mineral surfaces is zero, and promptly surface electrical behavior is zero, every kind of mineral all have its specific zero point (PZC), as limonite, iron ore, bloodstone three zero point is between 6.5～6.7, when PH in the ore pulp＞PZC, mineral surfaces bear electricity, when PH in the ore pulp＜PZC, mineral surfaces lotus positive electricity, during PH=PZC, mineral surfaces electrically is zero, and zero point that can be specific according to certain mineral (PZC) is worth for this reason, changes the pH value size of ore pulp, make PH greater than, be less than or equal to PZC, thereby reach the purpose of regulating the mineral surfaces charge.

The magnetic kind for having the minuteness particle of magnetic, optionally is adsorbed onto the purpose mineral surfaces, the purpose mineral zone is magnetic, and the magnetic kind has the branch of natural magnetic kind and artificial magnet's kind, and natural magnetic kind is to be purified and get through levigate and magnetic separation by natural magnetic iron ore, the grade of iron is more than 70%, fineness≤6 μ m.It is by Fe that the artificial magnet plants ³⁺And Fe ²⁺By a certain percentage, make the ferrite that is synthesized under the condition of cushioning liquid at ammoniacal liquor.

The used artificial magnet of this method plants building-up process:

Take by weighing 17.9 gram Fe ₂SO ₄.7H ₂O and 31.72 gram FeCl ₃.6H ₂O puts into the beaker of 400ml, adds the 200ml deionized water, and fully dissolving stirs, and adds to be ready to the NH that concentration is 28% 61.2ml28% in advance under strong agitation ₄OH solution, can synthesize dry weight is that particle diameter is less than the magnetic colloid particle of 1 μ m, i.e. artificial magnet's kind about 15 grams.Get a small amount of colloid and weigh, filtration drying is weighed again, can calculate its contents on dry basis.

Below detailed description of the present invention is as follows by technological process:

(1) the hard Raolinite is pulverized, added water mill, make moisture 60% stand-by ore pulp carefully to particle diameter≤30 μ m; Reach and make iron, titanium impure mineral and kaolinite monomer separation;

(2) stand-by ore pulp is added dispersant under 400～500 rev/mins middle intensity mixing speed, material as dispersant has 3 kinds, and a. calgon, dosage are 0.1～0.3%, b. waterglass, dosage is 0.1～0.3%, and C. sodium pyrophosphate, dosage are 0.5～0.7%, the amount that adds dispersant, with the pulp amount waiting to add in the ore pulp is benchmark, this moment ore pulp moisture is 65～70%, mixing time is 5～15 minutes;

(3) adopting acid, alkali to adjust the pulp PH value scope is 5～8, and acid can be adopted hydrochloric acid, sulfuric acid, and alkali can adopt NH ₄OH;

(4) add the magnetic kind, magnetic kind consumption a. is 0.1～0.2% as planting 0.05～0.30% optimum range that is incorporated as the breeze amount with the artificial magnet.B. as being 0.1～0.8% of breeze amount with natural magnetic kind addition, optimised quantity is 0.2～0.5%, when adding the magnetic kind, requires to carry out strong agitation, and rotating speed is 1400～1700 rev/mins, and mixing time is 2～5 minutes.

(5) high gradient magnetic separator is used in magnetic separation, and magnetic field intensity is 1.0～1.8 teslas, and ore pulp action time in magnetic field was 20～40 seconds.

Advantage of the present invention is:

This method adopts magnetic method relatively with single, and list is used magnetic method, and the highest of deironing rate reaches 15%, removes the titanium rate and is up to 10%.With the deironing of the inventive method magnetic method, titanium technology, iron, Ti content rate of descent are: Fe ₂O ₃40%-50%, TiO ₂Be more than 40%.

Below be embodiments of the invention:

Example 1, certain hard Raolinite, its chemical composition is as follows:

????SiO ₂	????Al ₂O ₃	????Fe ₂O ₃	???TiO ₂	????MgO	????K ₂O	Burn and lose
????SiO ₂	????Al ₂O ₃	????Fe ₂O ₃	???TiO ₂	????MgO	????K ₂O	Burn and lose	??47.63％	???35.91％	???1.18％	??0.89％	??0.31％	??0.45％	??15.1％

The iron, the titanium mineral that are present in this Raolinite are limonite, pyrite, and bloodstone contains reinforcing nigrine, is present in the Raolinite with microfine (≤10 μ m) dip-dye owing to contain the mineral of ferrotitanium, adopts methods of purification such as common magnetic separation, and final index can only reach Fe ₂O ₃≤ 1.0%, TiO ₂≤ 0.8%.Adopt above-mentioned magnetic kind partition method technology, the levigate Raolinite ore pulp that will contain pulp 500 grams, fineness was 500 mesh sieves, moisture 70%, put in the XFD3-65 type agitator, stirred 5 minutes, sodium pyrophosphate 0.35 gram (ratio in 0.7% is added) of adding dissolving in advance is 5.5～6.5 with hydrochloric acid adjustment PH, stirred 5 minutes, natural or the artificial magnet who add to disperse plants 0.5 gram (adding by 0.1% ratio) (1400 rev/mins) stirring 3 minutes at a high speed, pour in the VP-φ 125 type high gradient magnetic separators, field intensity is 1.7 teslas, and medium is a steel wool, adding running water adjusting concentration to solid content is 10%, 10 liters/minute of flow rate of pulp, 3 minutes magnetic separation time, test parameters and result are as follows: contain Fe originally ₂O ₃1.18%, TiO ₂0.89%, use artificial magnet's kind, handle the Fe of back Raolinite ₂O ₃Content is 0.78%, TiO ₂0.50%; With natural magnetic kind, handle the Fe of back Raolinite ₂O ₃Content is 0.75%, TiO ₂0.54%.

Example 2: certain hard Raolinite, its chemical composition is as follows:

????SiO ₂	????Al ₂O ₃	????Fe ₂O ₃	???TiO ₂	????MgO	????K ₂O	Burn and lose
????SiO ₂	????Al ₂O ₃	????Fe ₂O ₃	???TiO ₂	????MgO	????K ₂O	Burn and lose	????52.56	????28.99	????2.17	????1.09	????0.98	????2.08	????12.44

It is carried out the magnetic separation of magnetic kind partition method, and its process of the test and technological process add 0.1% with example 1 with artificial magnet's kind, and other handles back Fe with example 1 ₂O ₃1.15%, TiO ₂0.64%; With natural magnetic kind 0.3%, all the other are the same, handle back Fe ₂O ₃1.24%, TiO ₂0.7%.

Example 3: certain hard Raolinite, its chemical composition is as follows:

????SiO ₂	????Al ₂O ₃	????Fe ₂O ₃	????TiO ₂	????MgO	????K ₂O	Burn and lose
????SiO ₂	????Al ₂O ₃	????Fe ₂O ₃	????TiO ₂	????MgO	????K ₂O	Burn and lose	????43.10	????38.76	????0.92	????0.72	????0.38	????0.01	????11.10

It is carried out the magnetic separation of magnetic kind partition method, and its process of the test and technological process are with example 1,2, and the magnetic kind is all used 0.1% artificial magnet's kind, use the dispersant difference, when a. makes dispersant with 0.3% waterglass, handle back Fe ₂O ₃0.5%, TiO ₂0.42%.When b. making dispersant, handle back Fe with calgon ₂O ₃Be 0.50%, TiO ₂Be 0.42%.

More than three embodiment show, use the magnetic separation partition method, deironing, titanium impurity are very effective, under similarity condition, adding the artificial magnet plants the effect ratio to add natural magnetic kind effective, when three kinds of above-mentioned dispersants, consumption control good, effect is all better, it needs to be noted: these three kinds of dispersants are minimum with pyro acid sodium price, effect, six meta-acids are received effective, but the price height is unsuitable for adopting.

Claims

1. a coal series hard kaolinite by magnetic method deironing, titanium technology is characterized in that:

(1), makes moisture 60% stand-by ore pulp with hard Raolinite crushing raw ore and add water mill carefully to particle diameter≤30 μ m;

(2) stand-by ore pulp adds dispersant under 400～500 rev/mins middle intensity mixing speed, and the ore pulp water content is adjusted to 65～70%, and mixing time is 5～15 minutes;

(3) with acid, alkali is adjusted pulp PH value to 5～8;

(4) add a certain amount of artificial or natural magnetic kind, carry out strong agitation simultaneously, mixing speed is 1400～1700 rev/mins, and mixing time is 2～5 minutes;

(5) use the high gradient magnetic separator magnetic separation, magnetic field intensity is 1～1.8 tesla, and ore pulp action time in magnetic field is 20～40 seconds kinds.

2. according to claim 1, described coal series hard kaolinite by magnetic method deironing, titanium technology is characterized in that described dispersant is a sodium pyrophosphate, and addition is 0.5～0.7% of a pulp.

3. coal series hard kaolinite by magnetic method deironing according to claim 1, titanium technology is characterized in that described dispersant is a sodium metaphosphate, and the sodium metaphosphate dosage is 0.1～0.3% of a pulp.

4. coal series hard kaolinite by magnetic method deironing according to claim 1, titanium technology is characterized in that described dispersant is a waterglass, and the waterglass addition is 0.1～0.3% of a pulp.

5. coal series hard kaolinite by magnetic method deironing according to claim 1, titanium technology is characterized in that the acid of described adjustment pH value, and alkali is hydrochloric acid, sulfuric acid or ammoniacal liquor.

6. coal series hard kaolinite by magnetic method deironing according to claim 1, titanium technology, it is characterized in that described natural magnetic kind is to use magnetic iron ore, purifying through levigate and magnetic separation requires to reach, and the grade of iron is Fe% 〉=70%, fineness is≤6 μ m, and addition is 0.1～0.8% of a pulp.

7. coal series hard kaolinite by magnetic method deironing according to claim 6, titanium technology is characterized in that described natural magnetic kind optimum amount is 0.2～0.5% of a pulp amount.

8. coal series hard kaolinite by magnetic method deironing according to claim 1, titanium technology, it is as follows to it is characterized in that described artificial magnet plants building-up process: with 17.9 gram Fe ₂SO ₄, 7H ₂O and 31.72 gram FeCl ₃.6H ₂O puts into the 400ml beaker, adds the 200ml deionized water dissolving, stirs, and adds 3 grams and be ready to the NH that concentration is 28% 61.2ml under strong agitation ₄The synthetic dry weight of OH solution is 15 grams, and particle diameter is less than the magnetic kind particle of 1 μ m.

9. coal series hard kaolinite by magnetic method deironing according to claim 1, titanium technology is characterized in that described adding artificial magnet kind scope is 0.05%～0.3%.

10. coal series hard kaolinite by magnetic method deironing according to claim 1, titanium technology is characterized in that the optimum range that described adding artificial magnet plants is 0.1～0.2%.