CN108609885A - A method of it solving mirabilite gypsum and feeds intake difficulty as cement retarder - Google Patents

A method of it solving mirabilite gypsum and feeds intake difficulty as cement retarder Download PDF

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Publication number
CN108609885A
CN108609885A CN201810519547.0A CN201810519547A CN108609885A CN 108609885 A CN108609885 A CN 108609885A CN 201810519547 A CN201810519547 A CN 201810519547A CN 108609885 A CN108609885 A CN 108609885A
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gypsum
mirabilite gypsum
mirabilite
water content
belt
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CN201810519547.0A
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CN108609885B (en
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彭诗谷
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SICHUAN TONGQING NANFENG CO Ltd
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SICHUAN TONGQING NANFENG CO Ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B22/00Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08Acids or salts thereof
    • C04B22/14Acids or salts thereof containing sulfur in the anion, e.g. sulfides
    • C04B22/142Sulfates
    • C04B22/147Alkali-metal sulfates; Ammonium sulfate
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/20Retarders
    • C04B2103/22Set retarders

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Lining And Supports For Tunnels (AREA)

Abstract

It solving the problem of that mirabilite gypsum is used as cement retarder and feeds intake difficult method to solve mirabilite gypsum because powder form cannot smoothly add in manufacture of cement the invention discloses a kind of, includes the following steps:(1) water content, (2) screening, the ageing of (3) pressure ball are reduced;Because water content has larger impact to the cementability of mirabilite gypsum, higher content (20% or more) can cause balling ratio low or be unable to balling-up, ensure that the moisture content of mirabilite gypsum meets the requirement of balling technique by reducing water content and screening, to reduce the cost problem of production.

Description

A method of it solving mirabilite gypsum and feeds intake difficulty as cement retarder
Technical field
The invention belongs to the technical fields of manufacture of cement more particularly to a kind of solution mirabilite gypsum to be thrown as cement retarder Expect difficult method.
Background technology
Meishan city is production saltcake, that is, industrial anhydrous sodium sulfate Na2SO4Large enterprise's aggregation ground, mining area is annual The driving by-product glauberite slag of about 2,000,000 tons of discharge.Glauberite slag muck is placed on ground refuse dump, by with pumping for water pump pair Slag carries out repeatedly shower and leaches saltcake, leaches the saltcake water after saltcake and is transported to the molten area's production glass gall in underground, slag with water pump Shape becomes powdery from bulk after shower.The reaction equation of glauberite slag is Na2SO4·CaSO4+H2O→Na2SO4+CaSO4· 2H2Na is precipitated after water leaching leaching in O, i.e. glauberite slag2SO4, while dihydrate gypsum CaSO is precipitated4·2H2O contains two water in slag Gypsum 70% or so.Na in ore2SO4After leaching, CaSO4Content proportion accordingly increases and forms so-called mirabilite gypsum.Saltcake Gypsum slag stores up refuse dump for many years, occupies tract, has a certain impact to geological environment.For this purpose, cement production enterprise Natural gypsum incorporation cement is substituted to mirabilite gypsum to reapply as retarder progress resource.
Lime stone, clinker, gypsum, the slag etc. that cement production enterprise manufacture of cement uses at present are block stock, and Stacked using big-volume vertical raw material storage, raw material storage is generally poured using armored concrete, as straight section is cylindrical, Bottom cone, general capacity is all at 3000 tons or more.And powder raw material is influenced by material form, moisture content and poor fluidity, It can not directly be deposited in vertical raw material storage;Otherwise it can lump because gravity squeezes, so as to cause Severe blockage.Powdery is former at present Material can only be deposited in traditional ground raw material storage, need the line that feeds intake that powder raw material is created in feed proportioning system, then use engineering Machinery carries out discontinuous feeding, but this feeding method there are operating costs it is high, environment protection control point is more the shortcomings of.
Mirabilite gypsum is isolated by carrying out glauberite, and mirabilite gypsum is as a kind of completely new product, by The influence of production technology, mirabilite gypsum product after dehydration its water content 20% hereinafter, product form be powdery and block Shape, size distribution situation are:10mm ratios below are 36-46%, remaining is 10mm or more, and product form is essentially powder Shape and blocky each half, therefore there are the difficult problem that feeds intake of mirabilite gypsum, affect the large-scale use of mirabilite gypsum;Another party The existing ball press technique in face there are grain diameter unevenness, the parameters such as moisture can not equal problem up to standard, cannot be satisfied saltcake The demand of gypsum pressure ball.
Invention content
It is an object of the invention to:Have the characteristics that granular material is excessive for above-mentioned mirabilite gypsum form, caused awns The difficulty that feeds intake of nitre cream, affects the problem of mirabilite gypsum is put into operation on a large scale, and the present invention provides a kind of solution saltcake stone Cream is used as cement retarder and feeds intake difficult method.
The technical solution adopted by the present invention is as follows:
A method of it solving mirabilite gypsum and feeds intake difficulty as cement retarder, include the following steps:
(1) water content is reduced:The mass percent of the water content of mirabilite gypsum is reduced into 2-6%, until easy pressure ball molding Until;
(2) it sieves:Mirabilite gypsum is sent by the mirabilite gypsum after water content is reduced according to the principle of first in, first out Mirabilite gypsum is delivered to screening plant by belt by the belt, by the grain size of mirabilite gypsum 10mm or less and 10mm with On sift out respectively;The grain size of mirabilite gypsum is fed directly to ageing library by belt in 10mm or more, is aged 2-7 days;
(3) pressure ball:The grain size that the mirabilite gypsum come is screened out in step (2) is below high by belt feeding in 10mm It is pressed into ball machine and carries out pressure ball processing formation pelletizing, the mirabilite gypsum formed after pelletizing is delivered to ageing library, is aged 2-7 days again.
By the way that the mass percent of the water content of mirabilite gypsum is reduced 2-6%, be for the ease of mirabilite gypsum pressure ball at Type;Grain size the sifting out respectively in 10mm or less and 10mm or more that can make mirabilite gypsum by screening, by the grain of mirabilite gypsum Diameter is fed directly to ageing library in 10mm or more by belt, carries out ageing 2-7 days, mirabilite gypsum is by the way that condensation can be substantially certainly Improve the material strength after balling-up;Grain size can be made to carry out pressure ball processing in 10mm mirabilite gypsums below by pressure ball and form ball Group, convenient for feeding intake for mirabilite gypsum, to solve the problems, such as that it is difficult that mirabilite gypsum is used as cement retarder addition.
Preferably, the mode that water content is reduced in the step (1) is mirabilite gypsum to be transported to gypsum library, and pass through heap Material machine is stacked, and is stacked 7-35 days under conditions of room temperature.General winter, which stacks 7 days moisture content, reduces by 2.2% or so, and summer stacks 7 Its moisture content reduces by 2.8% or so, and the main purpose of stacking is that mirabilite gypsum moisture content is made to reduce as possible;The capacity in gypsum library ensures awns Nitre gypsum product can be stacked 7-35 days, the water content of mirabilite gypsum can be made to reduce by naturally stacking;Using nature heap The mode put at the same avoid due to the water content of mirabilite gypsum reduces and caused by economic cost raising.
Preferably, the mode that water content is reduced in the step (1) is by drying equipment by the water content of mirabilite gypsum Reduce 2-6%.The water content of mirabilite gypsum can be made promptly to be reduced to the numerical value of needs by drying equipment, save the time Cost improves the efficiency of work.
Preferably, the high pressure formed by balling machine line pressure reaches 1000-20000kg/cm2
Preferably, the pelletizing in the step (3) is ellipse.
In conclusion by adopting the above-described technical solution, the beneficial effects of the invention are as follows:
1. because water content has larger impact, higher content (20% or more) that can lead to balling-up the cementability of mirabilite gypsum Rate is low or is unable to balling-up, the requirement of balling technique is met by the reduction of the water content to mirabilite gypsum, to solve saltcake The difficult problem that feeds intake of gypsum, to solve the problems, such as that it is difficult that mirabilite gypsum is used as cement retarder addition;
2. the water content of mirabilite gypsum can be made to reduce by naturally stacking;Naturally the mode stacked can to avoid due to There is no waste heat that can utilize and cause mirabilite gypsum using drying equipment reduce water content and caused by economic cost raising;
3. 10mm's or more and the mirabilite gypsums of 10mm or less grain sizes are detached using screening plant, due to 10mm with The mirabilite gypsum of upper grain size meets the use gone into operation on a large scale, and only low grain size mirabilite gypsum below to 10mm carries out at balling-up Reason, the technique can reduce the cost of balling-up;
4. balling-up equipment requirement balling-up line pressure reaches 1000-20000kg/cm2More than, to improve pellet strength and balling-up Rate;
5. high pressure nodulizer carries out pressure ball processing and forms pelletizing, the pelletizing shape is selected as ellipse, and requires to balling-up Face carries out special process processing and improves finish, and this method is conducive to nodulizer and takes off ball.
Specific implementation mode
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive Feature and/or step other than, can combine in any way.
Embodiment 1
A method of it solving mirabilite gypsum and feeds intake difficulty as cement retarder, include the following steps:
(1) water content is reduced:Mirabilite gypsum is transported to gypsum library, and is stacked by stacker, at normal temperatures natural heap It puts 35 days, water content is made to reduce by 6%;
(2) it sieves:Mirabilite gypsum will be sent into belt according to the principle of first in, first out by the mirabilite gypsum after stacking, led to Cross the belt and mirabilite gypsum be delivered to screening plant, by the grain size of mirabilite gypsum 10mm or less and 10mm or more difference It sifts out;The grain size of mirabilite gypsum is fed directly to ageing library by belt in 10mm or more, is aged 2 days;
(3) pressure ball:The grain size that the mirabilite gypsum come is screened out in step (2) is below high by belt feeding in 10mm It is pressed into ball machine and carries out pressure ball processing formation pelletizing, the mirabilite gypsum formed after pelletizing is delivered to ageing library, is aged 2 days again.
The high pressure formed by balling machine line pressure reaches 1000-20000kg/cm2
Pelletizing in the step (3) is ellipse.
Embodiment 2
A method of it solving mirabilite gypsum and feeds intake difficulty as cement retarder, include the following steps:
(1) water content is reduced:Mirabilite gypsum is transported to gypsum library, and is stacked by stacker, at normal temperatures natural heap It puts 25 days, water content is made to reduce by 4%;
(2) it sieves:Mirabilite gypsum will be sent into belt according to the principle of first in, first out by the mirabilite gypsum after stacking, led to Cross the belt and mirabilite gypsum be delivered to screening plant, by the grain size of mirabilite gypsum 10mm or less and 10mm or more difference It sifts out;The grain size of mirabilite gypsum is fed directly to ageing library by belt in 10mm or more, is aged 3 days;
(3) pressure ball:The grain size that the mirabilite gypsum come is screened out in step (2) is below high by belt feeding in 10mm It is pressed into ball machine and carries out pressure ball processing formation pelletizing, the mirabilite gypsum formed after pelletizing is delivered to ageing library, is aged 3 days again.
The high pressure formed by balling machine line pressure reaches 1000-20000kg/cm2
Pelletizing in the step (3) is ellipse.
Embodiment 3
A method of it solving mirabilite gypsum and feeds intake difficulty as cement retarder, include the following steps:
(1) water content is reduced:Mirabilite gypsum is transported to gypsum library, and is stacked by stacker, at normal temperatures natural heap It puts 12 days, water content is made to reduce by 2.5%;
(2) it sieves:Mirabilite gypsum will be sent into belt according to the principle of first in, first out by the mirabilite gypsum after stacking, led to Cross the belt and mirabilite gypsum be delivered to screening plant, by the grain size of mirabilite gypsum 10mm or less and 10mm or more difference It sifts out;The grain size of mirabilite gypsum is fed directly to ageing library by belt in 10mm or more, is aged 4 days;
(3) pressure ball:The grain size that the mirabilite gypsum come is screened out in step (2) is below high by belt feeding in 10mm It is pressed into ball machine and carries out pressure ball processing formation pelletizing, the mirabilite gypsum formed after pelletizing is delivered to ageing library, is aged 4 days again.
The high pressure formed by balling machine line pressure reaches 1000-20000kg/cm2
Pelletizing in the step (3) is ellipse.
Embodiment 4
A method of it solving mirabilite gypsum and feeds intake difficulty as cement retarder, include the following steps:
The ball press technique of mirabilite gypsum, includes the following steps:
(1) water content is reduced:The water content of mirabilite gypsum is reduced by 2% by drying equipment;
(2) it sieves:Mirabilite gypsum is sent into skin by the mirabilite gypsum that water content reduces according to the principle of first in, first out Mirabilite gypsum is delivered to screening plant, by the grain size of mirabilite gypsum in 10mm or less and 10mm or more by band by the belt Sift out respectively;The grain size of mirabilite gypsum is fed directly to ageing library by belt in 10mm or more, is aged 5 days;
(3) pressure ball:The grain size that the mirabilite gypsum come is screened out in step (2) is below high by belt feeding in 10mm It is pressed into ball machine and carries out pressure ball processing formation pelletizing, the mirabilite gypsum formed after pelletizing is delivered to ageing library, is aged 5 days again.
The high pressure formed by balling machine line pressure reaches 1000-20000kg/cm2
Pelletizing in the step (3) is ellipse.
Embodiment 5
A method of it solving mirabilite gypsum and feeds intake difficulty as cement retarder, include the following steps:
(1) water content is reduced:The water content of mirabilite gypsum is reduced by 6% by drying equipment;
(2) it sieves:Mirabilite gypsum is sent into skin by the mirabilite gypsum that water content reduces according to the principle of first in, first out Mirabilite gypsum is delivered to screening plant, by the grain size of mirabilite gypsum in 10mm or less and 10mm or more by band by the belt Sift out respectively;The grain size of mirabilite gypsum is fed directly to ageing library by belt in 10mm or more, is aged 7 days;
(3) pressure ball:The grain size that the mirabilite gypsum come is screened out in step (2) is below high by belt feeding in 10mm It is pressed into ball machine and carries out pressure ball processing formation pelletizing, the mirabilite gypsum formed after pelletizing is delivered to ageing library, is aged 7 days again.
The high pressure formed by balling machine line pressure reaches 1000-20000kg/cm2
Pelletizing in the step (3) is ellipse.
Control experiment:
Control experiment 1
It is other same as Example 1 other than being stacked the inside not in gypsum library and being dehydrated mirabilite gypsum.
Table 1 at the mirabilite gypsum of pelletizing performance
Table 1 is as can be seen that the water content for the mirabilite gypsum at pelletizing that Examples 1 to 5 prepares is moderate, at pelletizing mistake Agglomerating rate is higher in journey, and pellet strength is larger, and pelletizing grain size is more uniform, and surface is smooth;Control experiment 1 is stacked due to lacking The step of, cause the water content of mirabilite gypsum higher, relatively low at pelletizing rate, pellet strength is smaller, and pelletizing grain size is very uneven.
Influence of 2 digestion time of table to the pellet strength of mirabilite gypsum
Table 2 can be seen that the pelletizing for the mirabilite gypsum that Examples 1 to 5 prepares, it can be seen that not by ageing Pellet strength is relatively low, is unable to meet demand;Can meet the needs of of feeding intake by 2 days pellet strengths of ageing, and with The extension pellet strength of digestion time gradually increases, but the speed enhanced gradually slows down.

Claims (5)

  1. A kind of difficult method 1. solution mirabilite gypsum feeds intake as cement retarder, which is characterized in that include the following steps:
    (1) water content is reduced:The mass percent of the water content of mirabilite gypsum is reduced into 2-6%, until easy pressure ball molding;
    (2) it sieves:Mirabilite gypsum is sent into belt by the mirabilite gypsum after water content is reduced according to the principle of first in, first out, Mirabilite gypsum is delivered to screening plant by the belt, by the grain size of mirabilite gypsum 10mm or less and 10mm or more point It does not sift out;The grain size of mirabilite gypsum is fed directly to ageing library by belt in 10mm or more, is aged 2-7 days;
    (3) pressure ball:By screened out in step (2) come mirabilite gypsum grain size 10mm it is below by belt be sent into high pressure at Ball machine carries out pressure ball processing and forms pelletizing, and the mirabilite gypsum formed after pelletizing is delivered to ageing library again, is aged 2-7 days.
  2. 2. a kind of according to claim 1 solve mirabilite gypsum and be used as cement retarder to feed intake difficult method, feature exists In, the mode that water content is reduced in the step (1) is mirabilite gypsum to be transported to gypsum library, and stack by stacker, It is stacked 7-35 days under conditions of room temperature.
  3. 3. a kind of according to claim 1 solve mirabilite gypsum and be used as cement retarder to feed intake difficult method, feature exists In the mode for reducing water content in the step (1) is that the water content of mirabilite gypsum is reduced 2-6% by drying equipment.
  4. 4. according to any one of claims 1 to 3 it is described it is a kind of solving mirabilite gypsum and be used as cement retarder to feed intake difficult method, It is characterized in that, the high pressure formed by balling machine line pressure reaches 1000-20000kg/cm2
  5. 5. according to any one of claims 1 to 3 it is described it is a kind of solving mirabilite gypsum and be used as cement retarder to feed intake difficult method, It is characterized in that, the pelletizing in the step (3) is ellipse.
CN201810519547.0A 2018-05-28 2018-05-28 Method for solving feeding difficulty of mirabilite gypsum used as cement retarder Active CN108609885B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1951856A (en) * 2006-11-08 2007-04-25 冯丽 Ardealite cement additives
CN101134646A (en) * 2007-07-25 2008-03-05 曹现强 Application process by using chemical calcium sulfate as cement retarder
CN101367632A (en) * 2008-09-26 2009-02-18 四川绵竹三佳饲料有限责任公司 Modified ardealite setting retarder for cement and its preparing process
CN102531441A (en) * 2012-02-28 2012-07-04 云南新龙矿物质饲料有限公司 Production method and product of cement retarder from ardealite

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1951856A (en) * 2006-11-08 2007-04-25 冯丽 Ardealite cement additives
CN101134646A (en) * 2007-07-25 2008-03-05 曹现强 Application process by using chemical calcium sulfate as cement retarder
CN101367632A (en) * 2008-09-26 2009-02-18 四川绵竹三佳饲料有限责任公司 Modified ardealite setting retarder for cement and its preparing process
CN102531441A (en) * 2012-02-28 2012-07-04 云南新龙矿物质饲料有限公司 Production method and product of cement retarder from ardealite

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
刘启儒等: ""芒硝石膏综合利用的技术研究"", 《中国井矿盐》 *
田野: ""脱硫石膏烘干成球技术探索"", 《建材发展导向(下)》 *

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