CN1059743A

CN1059743A - High grade natural iron red reparation technology

Info

Publication number: CN1059743A
Application number: CN 91106212
Authority: CN
Inventors: 陆路福; 陆方冰
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-08-23
Filing date: 1991-08-23
Publication date: 1992-03-25

Abstract

The present invention is a kind of high grade natural iron red reparation technology, and characteristics are to remove the Fe of impurity ₂O ₃The raw ore of content 〉=77% carries out fragmentation and ore grinding, again through at least twice high intensity magnetic separation, selects concentrate by whizzer then and concentrates through thickner, then carries out drying, be crushed to desired granularity again after, carry out surface toning, pack and be finished product.It is simple that the present invention has production technique, and cost is low, and the natural iron oxide red (Fe of higher-grade (more than 90%) directly is processed in the natural iron oxide red ore deposit that grade is lower ₂O ₃SiO ₂H ₂O).

Description

High grade natural iron red reparation technology

The invention belongs to the mineral dye technical field, the oxide compound of iron oxide red specifically, particularly natural iron oxide red preparation method.

Iron oxide red is used as the raw material, particularly You Qi basic raw material that touch coal and produce other iron-containing product in chemical industry, having a wide range of applications is worth and market.The inventor has applied for that to Patent Office of the People's Republic of China an application number is 89107330 " natural iron oxide red preparation method " in 1989.The characteristics of this method are that full iron is sorted out in the rhombohedral iron ore stone collection more than 30%, be ground into powder again through the water flushing, and water-soluble salt is higher than 2% powder further washes, filter, to the filter cake after filtering under 105-700 ℃ of temperature dry 1-1.5 hour, to dried filter cake pulverize once more natural iron oxide red (Fe2O3, SiO2, H2O) product.Though above-mentioned technology has thoroughly changed the production method of traditional iron oxide red, and remarkable in economical benefits, also there is weak point, for example, can't be processed into high-grade natural iron oxide red by the iron ore that ferrous grade is lower.

The object of the present invention is to provide a kind of iron ore that grade is lower directly to be processed into high grade natural iron red production technique, simultaneously other is polluted the harmful element of iron oxide red as zinc, manganese, calcium etc., carried out control effectively, and on color, adopted pulverising mill to carry out the surface toning and handle.

The object of the present invention is achieved like this, its technological process is: with Fe2O3 content 〉=77%(is all iron content 〉=55%) raw ore, after removing silt and other organism and moisture, carry out fragmentation, breeze after the fragmentation is after vibratory screening apparatus sieves, through ore mill the screen underflow below 1 millimeter is milled to the abrasive dust that granularity is the 0-0.074 millimeter again, again with the abrasive dust of 0-0.074 mm particle size at least through twice through magnetic separation, adopt the rhombohedral iron ore stone with weak magnetic intensity magnetic separator to select, wherein feed ore concentration is 20-50%, magneticstrength is at 14000 oersteds, selected breeze behind the high intensity magnetic separation is sub-elected concentrate through whizzer, concentrate through thickner, then carry out drying, its drying temperature is between 105-200 ℃, the rotary drying temperature is between 300-800 ℃, and be 1-3 hour time of drying.Dried elaboration is delivered to ore mill by rotary conveyor and is carried out abrasive dust, and its granularity is at the following surplus of 320 orders≤0.2%, carries out the surface toning by the grade grade then, qualified after testing after, under 45-60 ℃ of temperature, pack and be high grade natural iron red product.

From the above mentioned, utilize the natural iron oxide red industrial chemicals and the energy such as a large amount of sulfuric acid, caustic soda saved for country of iron ore exploitation of natural resources, reduced a large amount of synthetic man-hours, will produce the work simplification of iron oxide red, and make the iron oxide red cost reduce about 40%.Utilize this technology can produce the natural iron oxide red of higher-grade (90%), the key technical indexes reaches more than the H102 among the GB1863-80, and wherein the oxidation-resistance antiseptic property all is better than the iron oxide red and the low grade natural iron oxide red of synthetic.

Following Dou combined process schema is described in further detail technology of the present invention.

1, will will remove mud, sand and other organism and moisture after the exploitation of raw material ore deposit, its specific targets are referring to table 1.

2, fragmentation: adopt jaw crusher and cone crusher carry out slightly broken, in brokenly in shattering process, can not bring impurity and foul into to 13-0 centimetre, preferably put basin after the fragmentation into.

3, the ore after the fragmentation being removed out thing through vibratory screening apparatus sieve is the 0-1 mm particle size, and discharge port is 6 millimeters, and the 1-6 millimeter is the rough concentrate raw material, by analysis after, full iron grade reaches the grade of new demand, needs again broken.

4, the screen underflow ore deposit below 1 millimeter in ore mill is milled to 0-0.075 millimeter scope, turn back in the ore mill by screw classifier greater than 0.075 millimeter mineral aggregate and to grind again.

5, high intensity magnetic separation: determine that at first feed ore concentration reaches the breeze of above-mentioned 0-0.075 mm particle size between 20-50%, because granularity is very important to ore dressing, different ore dressing granularities has different results, so before production, must determine correct ore dressing granularity according to the particular case of raw material.The granularity of ore dressing will can decide with the granularity that ferric oxide separates in mineral according to gangue.Magneticstrength also will decide the specific susceptibility of general rhombohedral iron ore little according to the specific susceptibility of concrete mineral resources, shown magnetic is very weak, therefore must use stronger magnetic, could guarantee to be selected into, and this technology is selected 14000 oersteds (square centimeter/gram) for use.

6, breeze that will be by high intensity magnetic separation carries out sorting by the whizzer of 800 * 600 millimeters of φ, and the rotating speed of its ore dressing is 300-600 rev/min.

7, the concentrate of selecting through whizzer concentrates through thickner, then carries out drying, and drying temperature is between 105-200 ℃, and the rotary drying actuator temperature is between 300-800 ℃, and the time is 1.5 hours.Dried elaboration is delivered to grinding machine by rotary conveyor and is carried out milling process.Behind the abrasive dust, carry out surperficial toning process after after testing, then pack under about 50 ℃, it is natural iron oxide red to be higher-grade (90%).

Example one

With the full iron after the removal of impurities more than 55%, the raw ore of granularity 200-0 millimeter is the 13-0 millimeter through twice particle size after cracking of jaw crusher, through vibratory screening apparatus and ore mill fine grinding, to be that the raw ore of 0-0.74 millimeter (returned cross ore mill again greater than the raw ore of 0.74 mm particle size) carries out strong magnetic and roughly selects (φ 1000 imitative Jones) behind the hydrocyclone of φ 150 or φ 200 by the high weir spiral classifier granularity, selected by the φ 1000 imitative strong magnetic of Jones again, and then through the centrifugal choosing of the whizzer of φ 800 * 600, the thickner of concentrate after selected by φ 6000 center transmissions concentrated, adopt the inward flow filtration-type filter to filter, carry out drying then, drying temperature is controlled at 150 ℃, time is 2 hours, drying is packed under 50 ℃ of temperature after the fine grinding toning after pulverizing mill (320 mesh sieve surplus≤0.2%).Through two batch samples that example one is produced, first sample sees Table 2, the second batch samples through seven factory's detect parameters reports one by one and sees Table 3 through Northeast Polytechnic College detect parameters report.

Claims

1, a kind of high grade natural iron red preparation method is characterized in that: with Fe ₂O ₃The raw ore of content 〉=77% (being all iron content 〉=55%), after removing silt and other organism and moisture, carry out fragmentation, breeze after the fragmentation is after vibratory screening apparatus sieves, through ore mill the screen underflow below 1 millimeter is milled to the abrasive dust that granularity is the 0-0.074 millimeter again, again with the abrasive dust of 0-0.074 mm particle size at least through twice through magnetic separation, adopt the rhombohedral iron ore stone with weak magnetic intensity magnetic separator to select, wherein feed ore concentration is 20-50%, magneticstrength is at 14000 oersteds, selected breeze behind the high intensity magnetic separation is sub-elected concentrate through whizzer, concentrate through thickner, then carry out drying, its drying temperature is between 105-200 ℃, and the rotary drying temperature is between 300-800 ℃, and be 1-3 hour time of drying.Dried elaboration is delivered to ore mill by rotary conveyor and is carried out abrasive dust, and its granularity is at the following surplus of 320 orders≤0.2%, carries out the surface toning by the grade grade then, qualified after testing after, under 45-60 ℃ of temperature, pack and be finished product.

Full iron 〉=55%(Fe2O3 〉=77%), moisture≤1%, FeO≤0.5%, water-soluble salt≤1%, PH=5-7, CaO≤1% 2, natural iron oxide red preparation method according to claim 1 is characterized in that the index that requires in raw material ore deposit being:.