CN107311475A - A kind of modification dolomite and preparation method thereof - Google Patents

A kind of modification dolomite and preparation method thereof Download PDF

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Publication number
CN107311475A
CN107311475A CN201710681966.XA CN201710681966A CN107311475A CN 107311475 A CN107311475 A CN 107311475A CN 201710681966 A CN201710681966 A CN 201710681966A CN 107311475 A CN107311475 A CN 107311475A
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China
Prior art keywords
light
dolomite
burned
water
carbon dioxide
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Withdrawn
Application number
CN201710681966.XA
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Chinese (zh)
Inventor
陈永忠
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QINGYANG YONGCHENG CALCIUM INDUSTRY Co Ltd
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QINGYANG YONGCHENG CALCIUM INDUSTRY Co Ltd
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Priority to CN201710681966.XA priority Critical patent/CN107311475A/en
Publication of CN107311475A publication Critical patent/CN107311475A/en
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00—Lime, magnesia or dolomite
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00—Lime, magnesia or dolomite
    • C04B2/10—Preheating, burning calcining or cooling
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/08—Seawater, e.g. for desalination

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Thermal Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Non-Alcoholic Beverages (AREA)

Abstract

The invention provides a kind of modification dolomite and preparation method thereof, including light-burned, carbonating, stabilize three phases, modification dolomite prepared by the present invention, crystal structure is loose, porosity is big and even aperture distribution, porosity is not less than 10%, it can reach more than 50 times of corresponding raw ore porosity, for desalination water it is quenched when, the contact area of adjusting material and desalination water is significantly increased, dissolution rate is substantially accelerated, residence time only needs 1~5min just to reach effective regulation to desalinization water water quality, less than 10% of the dolomite raw ore residence time under equal conditions, therefore only desalination water need to be made to flow through the quenched tank equipped with the modification dolomite using the present invention, quenched process need not add medicament, quenched water outlet is in alkalescent, hardness, basicity is moderate, water molecule cluster is small, rich in calcium, magnesium, iron, the beneficial mineral element such as zinc, heavy carbonate rich content.

Description

A kind of modification dolomite and preparation method thereof
Technical field
The invention belongs to dolomite preparing technical field, and in particular to a kind of modification dolomite and preparation method thereof.
Background technology
With the development of membrane science technology, counter-infiltration has been increasingly becoming a kind of effective ways for solving world's fresh water crisis. Counter-infiltration can remove most bacterium, inorganic salts, organic matter etc. in seawater, but not be equal proportion to each ion component in seawater Ground is removed, Ca2+、Mg2+、SO42-It is high compared with monovalent ion etc. bivalent ions rejection so that the buffer capacity of desalination water is relatively It is weak.Further, since counter-infiltration can not retain the carbon dioxide in seawater, these carbon dioxide reach production water through membrane module It can be returned to behind side and HCO is converted into water3-, this will cause desalination by reverse osmosis water to have stronger corrosivity.This spy of desalination water Property so that transport, storage during calcium carbonate film be difficult on tube wall, bulkhead precipitate so that metallic material corrosion and produce Raw " red water " phenomenon, meanwhile, microorganism can also grow on tube wall and aggravate piping corrosion.These all will be to water supply cost, use Family produces a series of influence to the acceptance of desalination water, disinfection efficiency and user's body health etc..Therefore, from piping corrosion Consider with human body drinking safety, it is necessary to which desalination water water quality is adjusted.
The quenched method of desalination water includes mixing source water blending method, addition medical method and dissolving ore method.It is light in blending method Change water to be difficult to coordinate with mixing the ratio of source water；When addition medicament is quenched, the easy deliquescence of medicament, not Portable belt, and can be light to seawater Change water water quality and produce some side effects, for example, add Ca (OH)2When delivery turbidity increase, production water pH may be caused too high, add Plus NaHCO3When can cause production water it is astringent, influence drink mouthfeel；The raw ores such as dolomite, lime stone, medical stone are directly used in light When change water is quenched, though tcrude ore Mineral Concentrations are abundant, and it can realize to desalinization water pH, hardness, basicity, calcium-magnesium content Deng effective regulation, but tcrude ore rate of dissolution is excessively slow, and the residence time of desalination water in a device is long, and quenching and tempering device is excessive. If using H2SO4Or CO2Reduce inlet flow-patterm and accelerate ore rate of dissolution, water outlet pH can be made in acidity, need dosing to carry out pH regulations, and H2SO4With CO2Not portable, storage inconvenience greatly limit its application in ship desalination water is quenched
The content of the invention
To solve the above problems, it is an object of the invention to provide a kind of modification dolomite and preparation method thereof, specifically Technical scheme is：A kind of modification dolomite and preparation method thereof, comprises the following steps：
(1) it is light-burned：By raw material of dolomite raw ore, progress is light-burned, and light roasting temperature is 500~1200 DEG C, and the light-burned time is 3- 6h, is passed through carbon dioxide during light-burned, and light-burned stage heating rate is 5~10 DEG C/min, light-burned carbon dioxide in process Inside effusion, dolomite and surface forms uniform hole, and dolomite decomposition is calcium carbonate, calcium oxide and magnesia；
(2) it is carbonated：Product of the step 1 after light-burned is carbonated using wet method, carbonation is passed through vapor With carbon dioxide, calcium oxide, oxidation reactive magnesium generation hydroxide of the vapor with the formation of light-burned stage, then with carbon dioxide Reaction generation carbonate, heavy carbonate；Described vapor accounts for the 30~50% of mixed gas volume, and carbonation temperature is 50~ 150 DEG C, carbonation time is 1~5h；
(3) stabilize：Product after carbonating is stabilized in carbon dioxide atmosphere, stabilization temperature is 100 ~150 DEG C, the stabilisation time is 2-4h.
Further, the porosity of the modification dolomite is not less than 10%.
Further, the particle diameter of the dolomite raw ore used is 5~10mm.
Modification dolomite prepared by method of the present invention.
Beneficial effect：The invention provides modification white clouds prepared by a kind of modification dolomite and preparation method thereof, the present invention Stone, crystal structure is loose, and porosity is big and even aperture distribution, and porosity is not less than 10%, can reach corresponding raw ore porosity More than 50 times, for desalination water it is quenched when, the contact area of adjusting material and desalination water is significantly increased, and dissolution rate substantially adds It hurry up, the residence time only needs 1~5min just to reach effective regulation to desalinization water water quality, less than white clouds under equal conditions The 10% of stone raw ore residence time, therefore only desalination water need to be made to flow through equipped with the quenched of the modification dolomite using this patent Tank, quenched process need not add medicament, and quenched water outlet is in alkalescent, and hardness, basicity are moderate, and water molecule cluster is small, rich in calcium, The beneficial mineral element such as magnesium, iron, zinc, heavy carbonate rich content.
Embodiment
The invention will now be further described with reference to specific embodiments, and following examples are only the optimal implementation of the present invention Example, does not constitute any limitation to the scope of the present invention.It will be understood by those skilled in the art that without departing from the present invention's The details and form of technical solution of the present invention can be modified or replaced under spirit and scope, but these modifications and replacement are equal Fall within the scope of protection of the present invention.
Embodiment 1
A kind of modification dolomite and preparation method thereof, comprises the following steps：
(1) it is light-burned：By raw material of dolomite raw ore, progress is light-burned, and light roasting temperature is 800 DEG C, and the light-burned time is 5h, light Carbon dioxide is passed through during burning, light-burned stage heating rate is 8 DEG C/min, light-burned carbon dioxide in process effusion, dolomite Internal and surface forms uniform hole, and dolomite decomposition is calcium carbonate, calcium oxide and magnesia；
(2) it is carbonated：Product of the step 1 after light-burned is carbonated using wet method, carbonation is passed through vapor With carbon dioxide, calcium oxide, oxidation reactive magnesium generation hydroxide of the vapor with the formation of light-burned stage, then with carbon dioxide Reaction generation carbonate, heavy carbonate；Described vapor accounts for the 40% of mixed gas volume, and carbonation temperature is 100 DEG C, carbon Acidificatoin time is 3h；
(3) stabilize：Product after carbonating is stabilized in carbon dioxide atmosphere, stabilization temperature is 120 DEG C, the stabilisation time is 2-4h.
Further, the porosity of the modification dolomite is not less than 10%.
Further, the particle diameter of the dolomite raw ore used is 8mm.
Modification dolomite prepared by method of the present invention.
Embodiment 2
A kind of modification dolomite and preparation method thereof, comprises the following steps：
(1) it is light-burned：By raw material of dolomite raw ore, progress is light-burned, and light roasting temperature is 500 DEG C, and the light-burned time is 3h, light Carbon dioxide is passed through during burning, light-burned stage heating rate is 5 DEG C/min, light-burned carbon dioxide in process effusion, dolomite Internal and surface forms uniform hole, and dolomite decomposition is calcium carbonate, calcium oxide and magnesia；
(2) it is carbonated：Product of the step 1 after light-burned is carbonated using wet method, carbonation is passed through vapor With carbon dioxide, calcium oxide, oxidation reactive magnesium generation hydroxide of the vapor with the formation of light-burned stage, then with carbon dioxide Reaction generation carbonate, heavy carbonate；Described vapor accounts for the 30%~50% of mixed gas volume, and carbonation temperature is 50 DEG C, carbonation time is 1h；
(3) stabilize：Product after carbonating is stabilized in carbon dioxide atmosphere, stabilization temperature is 100 DEG C, the stabilisation time is 2h.
Further, the porosity of the modification dolomite is not less than 10%.
Further, the particle diameter of the dolomite raw ore used is 5mm.
Modification dolomite prepared by method of the present invention.
Embodiment 3
A kind of modification dolomite and preparation method thereof, comprises the following steps：
(1) it is light-burned：By raw material of dolomite raw ore, progress is light-burned, and light roasting temperature is 1200 DEG C, and the light-burned time is 6h, light Carbon dioxide is passed through during burning, light-burned stage heating rate is 10 DEG C/min, light-burned carbon dioxide in process effusion, dolomite Internal and surface forms uniform hole, and dolomite decomposition is calcium carbonate, calcium oxide and magnesia；
(2) it is carbonated：Product of the step 1 after light-burned is carbonated using wet method, carbonation is passed through vapor With carbon dioxide, calcium oxide, oxidation reactive magnesium generation hydroxide of the vapor with the formation of light-burned stage, then with carbon dioxide Reaction generation carbonate, heavy carbonate；Described vapor accounts for the 50% of mixed gas volume, and carbonation temperature is 150 DEG C, carbon Acidificatoin time is 1h~5h；
(3) stabilize：Product after carbonating is stabilized in carbon dioxide atmosphere, stabilization temperature is 150 DEG C, the stabilisation time is 4h.
Further, the porosity of the modification dolomite is not less than 10%.
Further, the particle diameter of the dolomite raw ore used is 10mm.
Modification dolomite prepared by method of the present invention.

Claims (4)

1. a kind of modification dolomite and preparation method thereof, it is characterised in that comprise the following steps：
(1) it is light-burned：By raw material of dolomite raw ore, progress is light-burned, and light roasting temperature is 500~1200 DEG C, and the light-burned time is 3-6h, Carbon dioxide is passed through during light-burned, light-burned stage heating rate is 5~10 DEG C/min, light-burned carbon dioxide in process ease Go out, inside dolomite and surface forms uniform hole, dolomite decomposition is calcium carbonate, calcium oxide and magnesia；
(2) it is carbonated：Product of the step 1 after light-burned is carbonated using wet method, carbonation is passed through vapor and two Carbonoxide, calcium oxide, oxidation reactive magnesium generation hydroxide of the vapor with the formation of light-burned stage, then with carbon dioxide reaction Generate carbonate, heavy carbonate；Described vapor accounts for the 30~50% of mixed gas volume, and carbonation temperature is 50~150 DEG C, carbonation time is 1~5h；
(3) stabilize：Product after carbonating is stabilized in carbon dioxide atmosphere, stabilization temperature is 100~150 DEG C, the stabilisation time is 2-4h.
2. a kind of modification dolomite according to claim 1 and preparation method thereof, it is characterised in that the modification dolomite Porosity be not less than 10%.
3. a kind of modification dolomite according to claim 1 and preparation method thereof, it is characterised in that the white clouds of the use The particle diameter of stone raw ore is 5~10mm.
4. modification dolomite prepared by the method described in claim 1.
CN201710681966.XA 2017-08-10 2017-08-10 A kind of modification dolomite and preparation method thereof Withdrawn CN107311475A (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113353959A (en) * 2021-06-22 2021-09-07 兰州交通大学 Method for preparing magnesium hydroxide and calcium hydroxide flame retardant by using dolomite

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113353959A (en) * 2021-06-22 2021-09-07 兰州交通大学 Method for preparing magnesium hydroxide and calcium hydroxide flame retardant by using dolomite

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