CN104445233A - Industrialized production method of wollastonite - Google Patents
Industrialized production method of wollastonite Download PDFInfo
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- CN104445233A CN104445233A CN201410787576.7A CN201410787576A CN104445233A CN 104445233 A CN104445233 A CN 104445233A CN 201410787576 A CN201410787576 A CN 201410787576A CN 104445233 A CN104445233 A CN 104445233A
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Abstract
The invention relates to an industrialized production method of wollastonite. The method is characterized by comprising the following steps: proportioning the raw materials of limestone and dinas rock at the weight ratio of (1.8-2.0) to (1.1-1.3), fully mixing evenly, and then adding the obtained material from a suspension preheater of a rotary kiln tail; feeding to a concentrated assault heating furnace segment, namely a pre-decomposition kiln segment after preheating an exhaust gas, so as to finish heat transfer at a high speed; feeding to a subsequent kiln segment of a rotary kiln, further heating, moving towards the kiln head at a constant speed; controlling the heating time of the material in the kiln to be 1-2 hours, controlling the temperature in the rotary kiln to be 1300-1600 DEG C, so that the raw materials reach the molten critical temperature; and taking out of the kiln when moving to the kiln head, so as to obtain the wollastonite. According to the method disclosed by the invention, the formation process of the wollastonite in the natural world can be artificially simulated and represented; production is carried out by selecting rotary thermal furnace equipment; the overall operation process is stable; the obtained wollastonite is stable in quality; and various materials are high in adaptability.
Description
Technical field
The present invention relates to a kind of industrialized preparing process of wollastonite.
Background technology
Wollastonite is a kind of non-metallic mineral products, a kind of metasilicate mineral of calcium.White that what nature was common is is to canescence (minority is flesh pink and Huang, the color such as green, brown).Crystal is often in needle-like, radial, fibrous, and plate---plate-like dense set is fit.Vitreous luster, hardness 4.5-5, proportion 2.87-3.09, fusing point 1540 DEG C, chemical formula is CaSiO
3, theoretical chemistry composition CaO=48.3%, SiO
2=51.7%, because calcium is wherein often by displacements such as iron, manganese, magnesium, titanium, strontiums, therefore the wollastonite of natural output all can have mentioned component.The physicochemical property of wollastonite uniqueness makes it in national economy numerous areas as Iron And Steel Industry, rubber industry, plastics industry, paint industry, coatings industry, ceramic industry, paper industry, welding electrode and national defense industry etc. all have extensive, important purposes.Carry out the starting material such as alternative carbonatite, clay, kaolin with wollastonite and make weighting agent and strengthening agent, the quality of the various types of product that each relevant industries can be made to produce increases substantially, and simplify the technological process of production, there is remarkable effect the aspect such as cost-saving.Practice shows, wollastonite is a kind of nonmetallic minerals of preciousness, a kind of indispensable starting material, with the production of the mankind, live inseparable, closely bound up.In the development of the national economy, play very important effect, there is very important social benefit and economic worth.
Along with science and technology and the developing by leaps and bounds of national economy, each field every profession and trade can be more deep and broad to the application of wollastonite, understand more higher, but natural wollastonite but can not meet the demand of this development to the requirement of wollastonite quality and quantity far away.
Summary of the invention
The object of this invention is to provide a kind of industrialized preparing process of wollastonite, the wollastonite Mineral resources of super quality and competitive price can be obtained by the industrial production of mass-producing.
A kind of industrialized preparing process of wollastonite, its special feature is, comprise the steps: by raw material limestone: the weight ratio of silica=1.8-2.0:1.1-1.3 carries out proportioning, fully mix again, then the suspended preheater of the material obtained by rotary kiln tail is added, heating kiln section and nsp kiln section is added by entering concentrated assault after heating by the exhaust gases, thus complete heat transfer at a high speed, the follow-up kiln section entering rotary kiln again continues heating, and make it at the uniform velocity move to kiln hood, material is controlled at 1-2 hours the heat-up time in kiln, rotary kiln temperature controls at 1300-1600 DEG C thus makes raw material reach melting critical temperature, when moving to kiln hood, kiln discharge obtains wollastonite.
The whole process being wherein added to kiln discharge from raw material is run by conputer controlled.
Wherein CaCO in Wingdale by weight
3content>=90%, SiO in silica
2content>=92%.
The forming process of the inventive method simulation reconstruction occurring in nature wollastonite artificially, reaches the order ground of mass-producing continuous prodution high quality silicon lime stone.Select revolution thermal kiln furnace equipment to produce, whole operating process is stablized, the wollastonite steady quality obtained, and various material adaptability is large, also possesses the large and advantages such as strong adaptability of throughput.
Embodiment
The physico-chemical property of wollastonite uniqueness is as follows:
1, have needle-like, radial, fibrous crystals form, the length-to-diameter of its fiber is generally (7-8): 1-(13-15): 1, if ratio can reach 20:1 after surface treatment.
2, fluxing performance: namely it can melt with silicon oxide, aluminum oxide etc. mutually at lesser temps (1060 DEG C-1149 DEG C), thus play the effect reducing mixture melt temperature, become a kind of good fusing assistant.
3, pure wollastonite is in white or brilliant white, purity is 99%, during granularity <325 order, its reflectivity can reach (92-96) %, whiteness can reach (91-93) %, can reach 98% after brightening process, these characteristics make it paint in the production with shinny coating in advanced ceramic and high-quality white important value.
4, the coefficient of expansion is lower, and coefficient of expansion change is also less, and is uniform linear expansion.
5, there is high dielectricity, high thermotolerance, low oil absorbency and water-intake rate.
6, fabulous chemical stability, in the neutral water of 25 DEG C, solubleness is 0.0095g/100ml, generally acidproof, alkaline-resisting, chemical resistance.Only in concentrated hydrochloric acid, be decomposed to form floss.Another when the calcium in wollastonite is by elements such as iron, manganese, titanium, magnesium, then above-mentioned physicochemical property is had an impact when aliquot replacement forms Solid solution.
The mineralization machanism of wollastonite is as follows:
Wollastonite is a kind of typical metamorphic mineral.Originate on the contact zones of carbonatite and acid magmatic rock, that is in the contact site of Carbonate rock and silicic acid rock mass, due to the effect of temperature, pressure and chemical activity fluid, the mineral stable in new physics, chemical environment that two kinds of rocks change in structure, structure or chemical composition and formed, alternatively due to the intrusion of acid magmatic rock, the physics, the chemical transformation that produce the complexity such as melting mixing, infiltration, explanation in the contact site of Carbonate rock are formed.
Angle is chemically seen, under normal pressure, raised temperature reaches 500 DEG C when going up, Wingdale (CaCO
3) decompose, release CO
2↑, nascent state calcium oxide (CaO) and silicon oxide (SiO
2) start to produce reaction generation wollastonite (CaSiO in solid phase
3).Experiment shows: when temperature rises to 900 DEG C-1200 DEG C, carbonate decomposition reaches top speed, under this state, as long as CaO, SiO
2proportioning is suitable, even, can participate in reaction, forms wollastonite (CaSiO
3).Owing to being solid state reaction, so there is reaction by particle (contact zones) surface, go forward one by one to granular center (contact zones far-end) gradually, when particle (contact zones) surface reaction completes, and granular center (contact zones far-end) reaction has just just started or has not also started the rule of reaction, so, reaction be made to carry out thoroughly, the process of a time delay or wait will being had.When temperature rises to 1200 DEG C-1300 DEG C, there is liquid phase in the melting of wollastonite beginning, and when 1300 DEG C-1450 DEG C, liquid phase continues to increase, and reaction has been tending towards.1450 DEG C-1300 DEG C, cooling, mineralogical stabiliser gradually.
Embodiment 1:
Natural limestone and silica is broken, wherein CaCO in Wingdale by weight
3content is 90%, SiO in silica
2content is 92%, by Wingdale: the weight ratio of silica=1.9:1.2 carries out proportioning, fully mix again, then the suspended preheater of the material obtained by rotary kiln tail is added, heating kiln section and nsp kiln section is added by entering concentrated assault after heating by the exhaust gases, thus complete heat transfer at a high speed, the follow-up kiln section entering rotary kiln again continues heating, and make it at the uniform velocity move to kiln hood, material is controlled at 1 hour the heat-up time in kiln, in rotary kiln, top temperature controls at 1600 DEG C thus makes raw material reach melting critical temperature, when moving to kiln hood, kiln discharge obtains wollastonite.
The whole process being wherein added to kiln discharge from raw material is run by conputer controlled.
Wherein CaCO in Wingdale by weight
3content>=90%, SiO in silica
2content>=92%.
Embodiment 2:
Natural limestone and silica is broken, and grinding becomes the powder of 40 microns, wherein CaCO in Wingdale by weight
3content 98%, SiO in silica
2content 98%, by Wingdale: the weight ratio of silica=2.0:1.1 carries out proportioning, fully mix again, then the suspended preheater of the material obtained by rotary kiln tail is added, heating kiln section and nsp kiln section is added by entering concentrated assault after heating by the exhaust gases, thus complete heat transfer at a high speed, the follow-up kiln section entering rotary kiln again continues heating, and make it at the uniform velocity move to kiln hood, material is controlled at 1.5 hours the heat-up time in kiln, in rotary kiln, material top temperature controls at 1450 DEG C, and when moving to kiln hood, kiln discharge obtains wollastonite.
Embodiment 3:
Natural limestone and silica is broken, and grinding becomes the powder of 75 microns, wherein CaCO in Wingdale by weight
3content 96%, SiO in silica
2content 96%, by Wingdale: the weight ratio of silica=1.8:1.3 carries out proportioning, fully mix again, then the suspended preheater of the material obtained by rotary kiln tail is added, heating kiln section and nsp kiln section is added by entering concentrated assault after heating by the exhaust gases, thus complete heat transfer at a high speed, the follow-up kiln section entering rotary kiln again continues heating, and make it at the uniform velocity move to kiln hood, material is controlled at 2 hours the heat-up time in kiln, revolution kiln space top temperature controls at 1600 DEG C, and when moving to kiln hood, kiln discharge obtains wollastonite.
For wollastonite mineral products, country is unified standard not, and each mine every profession and trade also standard differs, and the wollastonite ore quality standard that China sells to world market is as follows:
Export trade ore quality standard
Prove through test, the wollastonite adopting the inventive method embodiment 1,3 to prepare all can reach first grade standard, and wollastonite prepared by embodiment 2 can reach select quality standard.
What present method adopted is the rotary system of six grades of biserials.
Claims (3)
1. the industrialized preparing process of a wollastonite, it is characterized in that, comprise the steps: by raw material limestone: the weight ratio of silica=1.8-2.0:1.1-1.3 carries out proportioning, fully mix again, then the suspended preheater of the material obtained by rotary kiln tail is added, heating kiln section and nsp kiln section is added by entering concentrated assault after heating by the exhaust gases, thus complete heat transfer at a high speed, the follow-up kiln section entering rotary kiln again continues heating, and make it at the uniform velocity move to kiln hood, material is controlled at 1-2 hours the heat-up time in kiln, rotary kiln temperature controls at 1300-1600 DEG C thus makes raw material reach melting critical temperature, when moving to kiln hood, kiln discharge obtains wollastonite.
2. the industrialized preparing process of a kind of wollastonite as claimed in claim 1, is characterized in that: the whole process being wherein added to kiln discharge from raw material is run by conputer controlled.
3. the industrialized preparing process of a kind of wollastonite as claimed in claim 1, is characterized in that: wherein CaCO in Wingdale by weight
3content>=90%, SiO in silica
2content>=92%.
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| CN201410787576.7A CN104445233A (en) | 2014-12-17 | 2014-12-17 | Industrialized production method of wollastonite |
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| CN201410787576.7A CN104445233A (en) | 2014-12-17 | 2014-12-17 | Industrialized production method of wollastonite |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101445271A (en) * | 2009-01-04 | 2009-06-03 | 李乾宽 | A method of producing vanadic oxide by using ore containing vanadium or SLAG containing vanadium |
| CN102180496A (en) * | 2011-03-03 | 2011-09-14 | 东北大学设计研究院（有限公司） | Device for producing alumina clinker by semi-dry process |
| CN102502677A (en) * | 2011-10-18 | 2012-06-20 | 邵燕 | Aedelforsite industrializing production method |
| CN102775162A (en) * | 2012-07-15 | 2012-11-14 | 山国强 | Anti-skinning refractory casting material |
| CN102838153A (en) * | 2012-09-20 | 2012-12-26 | 刘立文 | Method for producing vitriol and calcium oxide by decomposing gypsum |
-
2014
- 2014-12-17 CN CN201410787576.7A patent/CN104445233A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101445271A (en) * | 2009-01-04 | 2009-06-03 | 李乾宽 | A method of producing vanadic oxide by using ore containing vanadium or SLAG containing vanadium |
| CN102180496A (en) * | 2011-03-03 | 2011-09-14 | 东北大学设计研究院（有限公司） | Device for producing alumina clinker by semi-dry process |
| CN102502677A (en) * | 2011-10-18 | 2012-06-20 | 邵燕 | Aedelforsite industrializing production method |
| CN102775162A (en) * | 2012-07-15 | 2012-11-14 | 山国强 | Anti-skinning refractory casting material |
| CN102838153A (en) * | 2012-09-20 | 2012-12-26 | 刘立文 | Method for producing vitriol and calcium oxide by decomposing gypsum |
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Application publication date: 20150325 |