CN102127637A - Method for utilizing caustic calcined dolomite - Google Patents

Method for utilizing caustic calcined dolomite Download PDF

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Publication number
CN102127637A
CN102127637A CN 201110034852 CN201110034852A CN102127637A CN 102127637 A CN102127637 A CN 102127637A CN 201110034852 CN201110034852 CN 201110034852 CN 201110034852 A CN201110034852 A CN 201110034852A CN 102127637 A CN102127637 A CN 102127637A
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Prior art keywords
light dolomite
cement
mgcl
ball
polyvinyl alcohol
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CN 201110034852
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CN102127637B (en
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史永林
王立新
李建军
叶文成
仪桂兰
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Shanxi Taigang Stainless Steel Co Ltd
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Shanxi Taigang Stainless Steel Co Ltd
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  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention relates to a method for utilizing caustic calcined dolomite. The method sequentially comprises the following steps of: 1, blending: performing fine grinding on caustic calcined dolomite and uniformly mixing 1 part of ground caustic calcined dolomite, 0.03-0.05 part of MgCl2 solution with the concentration of 15-25 percent and 0.02-0.05 part of cement; 2, adding an organic adhesive: spraying a polyvinyl alcohol organic adhesive with the concentration of 3-5 percent onto the mixture and uniformly mixing, wherein the mass of polyvinyl alcohol in the organic adhesive accounts for 0.01-0.02 percent of the mass of dolomite dust; 3, extruding and forming: conveying the mixture, into which the organic adhesive is added, onto a ball press for pressing into balls; and 4, curing the balls by natural drying, wherein the measured intensity is between 1,300N/ball and 1,800N/ball. The method for utilizing the caustic calcined dolomite has a low production cost, and environmental pollution caused by dolomite dust is avoided.

Description

A kind of light dolomite powder utilize method
Technical field
The present invention relates to a kind of method of utilizing of light dolomite powder.
Background technology
Roasting need be carried out to raw ore in order to utilize better in rhombspar raw ore exploitation back in steelmaking process, make CaCO wherein 3Decompose and generate CaO, MgCO 3Decompose and generate MgO.But, in the baked for producing process, the annual light dolomite powder that produces about 10% granularity less than 10mm, these powders use owing to too little can not directly the joining in converter or the electric furnace of granularity, generally be all to store up, not only waste resource, and environment is caused severe contamination.Many enterprises are used to do MAGNESIUM METAL with the light dolomite powder, and weak point is that its effective MgO content is too low, and production cost is higher.For effectively utilizing the light dolomite powder, solve the overstocked problem of light dolomite powder, research produces cheaply with the light dolomite powder that light dolomite powder pressure ball just becomes extremely urgent problem.
Summary of the invention
In order to overcome the above-mentioned deficiency of utilizing method of existing light dolomite powder, the invention provides. the light dolomite powder that a kind of cost is low utilize method.
Scheme provided by the invention is that the light dolomite powder is made the rhombspar pressure ball, allocates earlier concentration into and be 15%～25% MgCl in the light dolomite powder 2Solution, the amount of allocating into are the MgCl that makes in the solution 2Quality be 0.03～0.05 of light dolomite opaque amount, allocate 0.02～0.05 cement of light dolomite opaque amount again into, then it is stirred, the polyvinyl alcohol solution of allocating concentration again into and be 4%-6% stirs, and the amount of allocating into is that to make the quality of the polyvinyl alcohol in the solution be 0.01～0.02 of light dolomite opaque amount.After carrying, belt delivers to extrusion molding in the pair roller ball press.Deliver into the warehouse through belt again and carry out maintenance.Maintenance can be gone into stove and be used after 1～3 day.
The method of this production rhombspar pressure ball comprises following sequential steps:
One, batching
With the light dolomite fine grinding, fine grinding requires: granularity is 1mm to the maximum, and accounting for more than 90% less than 0.5mm earlier; Generally reach 96%;
Then with the MgCl of concentration 15%-25% 2Solution evenly becomes compound with cement mixing, light dolomite, cement and MgCl in the compound 2MgCl in the solution 2Between proportion by weight be: 1 part in light dolomite powder; 0.02～0.05 part of cement; MgCl 20.03～0.05 part.
Two, add organic binding agent
With the concentration for preparing is that the polyvinyl alcohol organic binder bond of 4%-6% is sprayed onto on the compound, and the mass parts of the polyvinyl alcohol in the organic binder bond is 0.01～0.02 of a ground dolomite mass parts, mixes then.
Three, extrusion molding
The compound that will add organic binding agent is transported to ball press, is pressed into the agglomerate that profile overall dimension is 30～45mm.
Four, maintenance
With the agglomerate seasoning maintenance of extrusion molding, curing temperature is controlled between 10～35 ℃, and curing time was decided to be between 24～72 hours usually, and the intensity of survey is 1300N/ ball～1800N/ ball, tumbler index M + 6.3Be 80%～85%.
In the method for above-mentioned production light dolomite sphere of powder group when step 1, batching, according to MgCl in the compound 2Mass parts, according to the MgCl for preparing 2Strength of solution is 15%～25%, calculates the MgCl that should allocate into 2Solution quality part makes the MgCl in the solution 2Quality be 0.03～0.05 of light dolomite opaque amount; In step 2, when adding organic binding agent, mass parts according to the relative ground dolomite of polyvinyl alcohol in the organic binder bond, concentration according to polyvinyl alcohol in the organic binder bond for preparing is 4%-6%, calculate the mass parts of the polyvinyl alcohol organic binder bond that should allocate into, the quality that makes the polyvinyl alcohol in the solution is 0.01～0.02 of a light dolomite opaque amount.
For the ease of mixing, when step 1, batching, in the light dolomite powder, allocate concentration into and be 15%～25% MgCl in the method for above-mentioned production rhombspar pressure ball 2Behind the solution, mix earlier, remix is even behind the adding cement.
The method that the above-mentioned production light dolomite sphere of powder is rolled into a ball is characterized in that: after compound adds the polyvinyl alcohol organic binder bond, and light dolomite powder, MgCl 2, cement and polyvinyl alcohol best in quality part proportioning be:
1 part of MgCl of light dolomite powder 20.04 part
0.015 part of 0.03 part of polyvinyl alcohol of cement.
The method that the above-mentioned production light dolomite sphere of powder is rolled into a ball, it is characterized in that: in the batching step, cement is any of 325#, 425# or 525# cement.
The method that the above-mentioned production light dolomite sphere of powder is rolled into a ball, it is characterized in that: the polyvinyl alcohol organic binder bond of step 2, be earlier cold water to be put into dissolving tank, water vapor with high temperature (150-180 ℃) feeds in the water then, add chemical pure polyvinyl alcohol after temperature reaches 60-80 ℃, dissolve and make.
The method that the above-mentioned production light dolomite sphere of powder is rolled into a ball, it is characterized in that: when the step 3 extrusion molding, the rotating speed of ball press is adjusted at 10～15 rev/mins, and the distance between two rollers remains on 5～15mm.
Requiring of each step of method of this usefulness light dolomite powder production pelletizing is as follows:
One, batching
With light dolomite powder, MgCl 2Solution and cement mixing are even.If batch mixing is irregular, will cause not easy-formation of ball on the one hand, can cause the pressure ball uneven components on the other hand, thereby cause the pellet strength difference bigger, subsequently fall and the belt transportation in powder appears, can cause increasing the burden of dust-removal system like this, reduce the recovery rate of MgO.
Two, add organic binding agent
Ratio prepared material cohesiveness in above-mentioned steps one is very poor, and material loosening is difficult to moulding; Need add organic binding agent, make it in the process of pressure ball, play the agglutinating effect.After mixed material is served belt, be the organic binder bond that 0.01～0.02 polyvinyl alcohol is made into relative light dolomite powder mass parts, organic binder bond is sprayed onto on the compound, mixes.Material is transported to extrusion molding in the pair roller ball press by belt then.
Three, extrusion molding
Distance between the rotating speed of ball press and two rollers is adjusted very crucial, when producing light dolomite powder pressure ball, the rotating speed of ball press is generally adjusted to be in 10～15 rev/mins, distance between two rollers remains on 5～15mm, the purpose of doing like this has two: can make the pelletizing regular shape on the one hand, can keep certain squeeze on the other hand, make green-ball have certain intensity.
Four, maintenance
Intensity is not high after the green-ball moulding, need utilize the curing of cement and the intensity of pelletizing is significantly improved.Owing to mainly be to utilize the component in water and the cement to react in maintenance processes, therefore, the temperature of maintenance can not be too low, be controlled at usually between 10～35 ℃, otherwise, will reduce the intensity of ball, requirement of strength is not less than 1500N/ ball.Simultaneously, because reaction is carried out at normal temperatures, need therefore to guarantee that certain curing time is arranged that so curing time also is an important index, curing time was decided to be between 24～72 hours usually.
This light dolomite powder utilize method, produce the light dolomite sphere of powder with the light dolomite powder, make full use of the characteristics of the less easy balling-up of light dolomite powder degree, the light dolomite powder is pressed into bead it is used in converter and electric furnace.Save production cost, do not reduced use properties again, also digested the waste resource that produces in the rhombspar roasting process, avoided the ground dolomite environmental pollution.It is simple that this usefulness light dolomite powder production pelletizing has technology, and flow process is short, the production efficiency height, and the characteristics that curing time is short, the product mean compressive strength of production falls index greater than 90% greater than 1500N/ ball, and tumbler index is greater than 75%.Meet the condition that converter or electric furnace use fully.
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment, but the specific embodiment of the present invention is not limited to following embodiment.
Embodiment one
This light dolomite powder utilize method embodiment, be following sequential steps:
One, batching
With the light dolomite fine grinding, fine grinding requires: granularity is 1mm to the maximum, and accounts for 92% less than 0.5mm;
MgCl with light dolomite powder, concentration 20% 2Solution mixes by following quality with 325# cement:
Light dolomite powder 100kg cement 3kg
MgCl 2Solution 20kg
With forklift with light dolomite powder, cement and MgCl 2Solution is mixed into compound, MgCl in the compound 2Be 4kg.Till not seeing adularescent cement.
Two, add organic binding agent
It is that 4% polyvinyl alcohol organic binder bond is sprayed onto on the compound that 37.5kg is prepared concentration, and (quality of polyvinyl alcohol is 1.5kg in the organic binder bond) mixes.Material is transported to the pair roller ball press by belt then.
Three, extrusion molding
The compound that will add organic binding agent is transported to ball press, is pressed into the agglomerate that profile overall dimension is 40mm.The rotating speed of ball press is adjusted at 10 rev/mins, and the distance between two rollers remains on 10mm.Balling ratio reaches 92%.
Four, maintenance
With the agglomerate seasoning maintenance of extrusion molding, curing temperature is between 20-30 ℃, after the green-ball moulding green-ball is transported to the workshop stacking and carries out maintenance after 36 hours, and recording intensity is 1500N/ ball, falls index 92%, tumbler index 81%.
Embodiment two
The difference of present embodiment and embodiment one is when step 1, batching, allocates MgCl in the light dolomite powder 2Behind the solution, mix earlier, remix is even behind the adding cement.
The also available 425# of the cement of above-mentioned two embodiment, 525# replace.What two embodiment used is the II type pair roller ball press that machinery company limited of Luoyang City National Olympic produces.
Above-mentioned two embodiment step 1, batching with step 2, add the available forklift that mixes described in organic binding agent and mix, also available stirrer mixes.
The described concentration of present specification is mass percentage concentration.

Claims (5)

  1. A light dolomite powder utilize method, it comprises following sequential steps:
    One, batching
    With the light dolomite fine grinding, fine grinding requires: granularity is 1mm to the maximum, and accounting for more than 90% less than 0.5mm earlier;
    Then with the MgCl of concentration 15%-25% 2Solution evenly becomes compound with cement mixing, light dolomite, cement and MgCl in the compound 2MgCl in the solution 2Between proportion by weight be: 1 part in light dolomite powder; 0.02～0.05 part of cement; MgCl 20.03～0.05 part;
    Two, add organic binding agent
    With the concentration for preparing is that the polyvinyl alcohol organic binder bond of 4%-6% is sprayed onto on the compound, and the mass parts of the polyvinyl alcohol in the organic binder bond is 0.01～0.02 of a ground dolomite mass parts, mixes then;
    Three, extrusion molding
    The compound that will add organic binding agent is transported to ball press, is pressed into the agglomerate that profile overall dimension is 30～45mm;
    Four, maintenance
    With the agglomerate seasoning maintenance of extrusion molding, curing temperature is controlled between 10～35 ℃, and curing time was decided to be between 24～72 hours usually, and the intensity of survey is 1300N/ ball～1800N/ ball, tumbler index M + 6.3Be 80%～85%.
  2. 2. according to the method for the described production light dolomite of claim 1 sphere of powder group, it is characterized in that after compound adds the polyvinyl alcohol organic binder bond light dolomite powder, MgCl 2, cement and polyvinyl alcohol proportion by weight be:
    1 part of MgCl of light dolomite powder 20.04 part
    0.015 part of 0.03 part of polyvinyl alcohol of cement.
  3. 3. according to the method for claim 1 or 2 described production light dolomite spheres of powder group, it is characterized in that: in the batching step, cement is any of 325#, 425# or 525# cement.
  4. 4. according to the method for claim 1 or 2 described production light dolomite spheres of powder group, it is characterized in that: when the step 3 extrusion molding, the rotating speed of ball press is adjusted at 10～15 rev/mins, and the distance between two rollers remains on 5～15mm.
  5. 5. according to the method for the described production light dolomite of claim 3 sphere of powder group, it is characterized in that: when the step 3 extrusion molding, the rotating speed of ball press is adjusted at 10～15 rev/mins, and the distance between two rollers remains on 5～15mm.
CN 201110034852 2011-01-28 2011-01-28 Method for utilizing caustic calcined dolomite Active CN102127637B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102876835A (en) * 2012-10-26 2013-01-16 重庆大学 New technology for preparing converter slag-regulating reagent by light-burning dolomite powder ash
CN106350632A (en) * 2016-10-31 2017-01-25 湛江盛宝科技有限公司 Light roasting pressing ball for converter steelmaking and preparation method of light roasting pressing ball

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040107800A1 (en) * 2002-12-02 2004-06-10 Bansidhar Nayak Process for cold briquetting and pelletisation of ferrous or non-ferrous ores or mineral fines by iron bearing hydraulic mineral binder
CN101597173A (en) * 2009-07-17 2009-12-09 攀钢冶金材料有限责任公司 Utilize the corundum slag to prepare the method for refractory raw material
CN101892353A (en) * 2010-07-27 2010-11-24 南阳金戈利镁业有限公司 Method for preparing magnesium-based desulfurizing agent

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040107800A1 (en) * 2002-12-02 2004-06-10 Bansidhar Nayak Process for cold briquetting and pelletisation of ferrous or non-ferrous ores or mineral fines by iron bearing hydraulic mineral binder
CN101597173A (en) * 2009-07-17 2009-12-09 攀钢冶金材料有限责任公司 Utilize the corundum slag to prepare the method for refractory raw material
CN101892353A (en) * 2010-07-27 2010-11-24 南阳金戈利镁业有限公司 Method for preparing magnesium-based desulfurizing agent

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102876835A (en) * 2012-10-26 2013-01-16 重庆大学 New technology for preparing converter slag-regulating reagent by light-burning dolomite powder ash
CN102876835B (en) * 2012-10-26 2014-05-14 重庆大学 New technology for preparing converter slag-regulating reagent by light-burning dolomite powder ash
CN106350632A (en) * 2016-10-31 2017-01-25 湛江盛宝科技有限公司 Light roasting pressing ball for converter steelmaking and preparation method of light roasting pressing ball

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