CN1618522A

CN1618522A - Method for sorting raw menakanite

Info

Publication number: CN1618522A
Application number: CN 200310112233
Authority: CN
Inventors: 孔繁逸
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-11-21
Filing date: 2003-11-21
Publication date: 2005-05-25

Abstract

A process for classifying primary ilmenite includes such steps as wet crushing, wet screen classifying by diameters, wet crushing of the returned thick blocks, mixing the finest particles with water, gravitational separation, magnetic separation, drying to obtain finished product and tailings, respectively drying the medium-diameter materials, magntic separation to obtain finished product and tailings, collecting said tailings, reduction reacting, quick cooling, sieving, magnetic separation to obtain finished product and tailings, and recovering rutile and zircon from the tailings.

Description

The method for separating of primary ilmenite

Technical field

The present invention relates to the method for separating of ilmenite, refer in particular under the higher situation of ferric oxide content in ilmenite, effectively the method for sorting.

Background technology

Along with China's progress of science and technology, the demand of titanium dioxide increases year by year, to the demand of ilmenite cost of material is gone up year by year; Except that Panzhihua, domestic a lot of middle-size and small-size mines make titanium white production enterprise raw material anxiety because of a resource shrinkage.

Because of the needs of manufacturing enterprise, to TiO in the ilmenite ₂And Fe ₂O ₃Certain requirement is all arranged, press TiO ₂Content be divided into 48%, 50%, 52% 3 grade; Press Fe ₂O ₃Content be divided into＜10%,＜13% secondary.Because of place of production difference, enterprise is according to the main component of ilmenite, with the material matching use in the different places of production.When raw material sources were unstable, manufacturing enterprise's quality can be influenced.

According to mineral classification, ilmenite can be divided into three kinds of the secondary weathered ore of primary ore (bulk) (with the titanium sand of clay symbiosis) and extra large placers, the more difficult sorting of wherein primary ilmenite.

Chinese patent " improving one's methods of separating ilmenite " (publication number CN1060500A, patent No. ZL91109295.1) introduced in more detail a kind of from ore in sand form or concentrate the method for separating ilmenite, the flow process of this method can explain with the 17th page of Fig. 2 in this patent specification: 3. raw ore will discard after the magnetic iron ore separation with the low-intensity magnetic separation after sieving 2. through 1. separating with reselection modes after the fragmentation; In this process inevitably since in the shattering process its granularity of product of obtaining be a very big scope, it is not thorough to use gravity treatment and low-intensity magnetic separation to separate, and tailings that it discards and strong magnetic material are taken away the useful composition of part and caused the ilmenite utilization rate to reduce.

Press technology 4. in Fig. 2 flow process, treating material is not unique method by fluid bed reduction all, and by raw ore ratio consumption 20%～30% go back raw coal whether feasible economically still have to be analyzed.Put into practice mensuration through the inventor, examine and determine in practice except that qualification rate is on the low side, also have influence on the weak half-finished handling problem of magnetic part through non-magnetic tailings being discarded of grinding after the fluiddized-bed roasting from 5.～8. described technology.Even by common primary ilmenite Fe ₂O ₃Higher and cause selling price on the low side, but its loss in price should and be lost much smaller than the cost that increases by this patent.

Summary of the invention

The object of the present invention is to provide a kind of process route more reasonable, a kind of ilmenite method for separating that low, the primary ilmenite utilization rate of sorting cost is high.

The object of the present invention is achieved like this: a kind of method for separating of primary ilmenite comprises the steps: (1) wet type fragmentation successively; (2) wet type multi-stage screening is by grain size grading; (3) a. will not return step (1) by the coarse fodder that sieves; B. material that will be by dusting cover enters heavy extension set, wet magnetic separation, drying process together with water and gets finished product and tailings; C. with the median diameter material by particle diameter carry out drying respectively, magnetic separation gets finished product and tailings; (4) reduction reaction is carried out in the tailings mixing of step (3) c step; (5) material chilling, screening, the magnetic separation that step (4) is obtained gets finished product and tailings; (6) step (5) is got tailings and reclaim rutile and zircon sand according to a conventional method.

According to method of the present invention, the multistage sieve in the step (2) is good to be divided into level Four, and ground floor is 40 orders, and the second layer is that 80 orders, the 3rd layer are that 120 orders, the 4th layer are 160 orders.

According to method of the present invention, the condition of step (4) reduction reaction is: allocate into granularity less than 40 order weight be raw material 5～15% go back raw coal, 600 ℃～800 ℃ of temperature, reduction furnace burner hearth keep pressure-fired, 1～1.5 hour time, and stir material at any time.

Chilling in the step among the present invention (5) can adopt shrend cold, and the material magnetic behind chilling will increase greatly, can reclaim qualified products to greatest extent by the suitable adjustment of magnetic separator from tailings.

The present invention is according to the characteristics of primary ilmenite, and its symbiosis separate impurities efficient is directly proportional with the cleavage degree; But confirm in practice, the ilmenite granularity is after certain fineness, magnetic separation qualification rate and fineness are inversely proportional to, and in shattering process, can produce different granularities inevitably, thereby, to carry out gradation sizing after the primary ilmenite fragmentation, press different-grain diameter and select the appropriate condition magnetic separation respectively separately, can sub-elect most qualified products, and can improve the efficiency of separation; The material quantity of reduction reaction only is the 1/5-1/6 that the patent No. 91109295 is introduced, and has reduced production cost.

Description of drawings

Fig. 1 is a process flow diagram of the present invention.

The specific embodiment

Below in conjunction with drawings and Examples the present invention is done to describe further, but do not constitute any limitation of the invention.

As shown in Figure 1, the method for separating of primary ilmenite of the present invention, comprise the steps: successively after the fragmentation of primary ilmenite wet type, use high frequency shale shaker to add powerful water spray and carry out the wet type multi-stage screening, divide a plurality of ranks by particle diameter, wherein the material by dusting cover enters the spiral classifier gravity treatment together with water and reclaims the valency component is arranged, and carries out wet magnetic separation then, drying process gets finished product and tailings; It is broken again that the coarse fodder that does not sieve by the first order is returned disintegrating machine; With the median diameter material by particle diameter carry out drying respectively, because particle diameter particle size range at the same level is less, as long as suitably adjust gap, the magnetic field intensity of magnetic separator disk and belt conveyor, can sub-elect most qualified products according to each particle size range; Tailings at different levels are blended in carry out reduction reaction in the reverberatory furnace, during reaction suitably the control burner hearth keep pressure-fired, burner hearth can form reducing atmosphere; After having reacted, material is put into the pond chilling, the material magnetic behind chilling will increase greatly, and Fe ₂O ₃Major part is converted into FeO, and drying, screening, magnetic separation get finished product and tailings again; After above-mentioned processing, impurity enriched in tailings, with in the weak intensity dry type magnetic separation isolate weak magnetic and nonmagnetic material, discard after reclaiming rutile and zircon sand with conventional method.

Embodiment:

Raw material is the primary ilmenite of Vietnam Taiyuan province, after being crushed to the bulk below the 30mm, examining and determine its composition and is: TiO ₂Content be 45%～47.5%, Fe ₂O ₃Content be 17%～22%, the content of FeO is 27%～30% (to be: TiO with product quality after the conventional method sorting ₂Content less than 49%, Fe ₂O ₃Content greater than 16%).

Process route: (1) is with primary ilmenite wet ball-milling crusher machine; (2) use high frequency shale shaker to carry out gradation sizing the material after the fragmentation, and wash vibratory sieve with powerful shower water, ground floor does not return ball mill fragmentation again by 40 purpose material A with 40 mesh sieve sheets; The second layer adopts 80 mesh sieve sheets, and residue on sieve is semi-finished product B; The 3rd layer is adopted 120 mesh sieve sheets, and residue on sieve is semi-finished product C; The 4th layer is adopted 160 mesh sieve sheets, and residue on sieve is semi-finished product D; By 160 mesh sieves is semi-finished product E; (3) semi-finished product B, C, D are sent into the downflow type rotary furnace respectively, with the semi-finished product fully dehydrating but the product temperature of coming out of the stove should not too highly be standard control rate of feeding and burner hearth advances the burner temperature, obtain dry semi-finished product; (4) with dried semi-finished product B, C, D respectively with dry-type magnetic extractor with in weak intensity magnetic field carry out magnetic separation because the granularity difference, TiO in the material that the magnetic separator operation should strict control sub-elects ₂Content greater than 50%, Fe ₂O ₃Content less than 13%, tailings minimum simultaneously; (5) semi-finished product E after separating independent drying with wet magnetic separator after the gravity treatment goods of inferior quality.(6) tailings at different levels with step (4) mix, and allocate into less than 40 purposes raw coal also by weight 10%, adopt reverberatory furnace to be heated to about 700 ℃, and stir furnace charge at any time, the maintenance burner hearth is a pressure-fired, 1.5 hours reaction time, take off the outer water quenching pool chilling of coming out of the stove then, B, C, D screening are pressed in dry back, and press the method magnetic separation of a dry type respectively, obtain finished product and tailings, tailings can be handled by the recovery way of rutile and zircon sand.

Handle 100 tons of these primary ilmenites by method of the present invention, composition is: TiO ₂Be 47%, Fe ₂O ₃Be 18%, FeO is 28% by after screening, the magnetic separation for the first time, obtains certified products greater than 75 tons, product quality: TiO ₂Content greater than 50%, Fe ₂O ₃Content less than 13%; About 15 tons of B, C, D tailings contain TiO ₂Be 28%, Fe ₂O ₃Be 34%, FeO is 12% after reduction, magnetic separation, about 6 tons of seconds.Last tailings discards after separating rutile and zircon sand.Semi-finished product E obtains about 3.5 tons of product, product quality: TiO after wet magnetic separation, drying ₂Content be 48%, Fe ₂O ₃Content be 15%.Adopt the above-mentioned primary ilmenite of method sorting of the present invention, the certified products weight ratio is greater than 85%, TiO ₂The rate of recovery is greater than 90%.

Claims

1. the method for separating of a primary ilmenite comprises the steps: (1) wet type fragmentation successively; (2) wet type multi-stage screening is by grain size grading; (3) a. will not return step (1) by the coarse fodder that sieves; B. material that will be by dusting cover enters heavy extension set, wet magnetic separation, drying process together with water and gets finished product and tailings; C. with the median diameter material by particle diameter carry out drying respectively, magnetic separation gets finished product and tailings; (4) reduction reaction is carried out in the tailings mixing of step (3) c step; (5) material chilling, screening, the magnetic separation that step (4) is obtained gets finished product and tailings; (6) step (5) is got tailings and reclaim rutile and zircon sand according to a conventional method.

2. method for separating as claimed in claim 1, the multistage sieve in the step (2) can be divided into level Four, and ground floor is 40 orders, and the second layer is that 80 orders, the 3rd layer are that 120 orders, the 4th layer are 160 orders, also can be more than the secondary.

3. method for separating as claimed in claim 1, the condition of step (4) reduction reaction is: allocate granularity into less than 40 orders, weight be raw material 5～15% go back raw coal, 600 ℃～800 ℃ of temperature, reduction furnace burner hearth keep pressure-fired, 1～1.5 hour time, and stir material at any time.

4. method for separating as claimed in claim 1, the chilling in the step (5) can adopt shrend cold.