CN104150859A - Magnesium phosphate cement-based Gamma ray quick shielding material and preparation method thereof - Google Patents

Abstract

The invention discloses a magnesium phosphate cement-based γ-ray rapid shielding material, which is characterized in that it consists of 5-40% of dead-burned magnesia, 10-35% of potassium dihydrogen phosphate, 1-15% of borax, barite, oxidized 20-70% of raw material components and mass percentages of one or more mixtures of lead, metallic lead, and magnetite, and 10-20% of the total mass of solids: the raw materials are mixed evenly, Adding water to stir it into shape and curing it naturally can produce magnesium phosphate cement-based γ-ray rapid shielding material. The invention provides a magnesium phosphate cement-based gamma ray rapid shielding material with early strength and quick hardening, good environmental adaptability, excellent gamma ray shielding performance, simple process, low carbon and environmental protection and a preparation method thereof. The gamma ray rapid shielding material provided by the invention is suitable as a radiation protection material for shielding gamma rays produced by reactors, particle accelerators and facilities containing radioactive source devices and radioactive substances in a short time.

Description

A kind of magnesium phosphate cement-based γ-ray rapid shielding material and preparation method thereof

technical field

The invention belongs to radiation protection materials and preparation thereof, and relates to a magnesium phosphate cement-based γ-ray rapid shielding material and a preparation method thereof. The gamma ray rapid shielding material prepared by the phosphate cement in the invention is especially suitable as a radiation protection material for shielding gamma rays produced by reactors, particle accelerators, facilities containing radioactive source devices and radioactive substances in a short time.

Background technique

With the development of nuclear energy industry and radiation technology, radioactive substances and radioactive sources are widely used in military, nuclear power, medicine, communication and other fields and in daily life. A large number of high-energy rays such as gamma rays and secondary gamma rays generated during use bring convenience to human beings and also cause some harm to human health. Shielding materials are used as the first barrier to shield gamma rays. Especially in the event of a nuclear accident, it is necessary to shield radioactive substances or rays within a small safety range in a short period of time to prevent them from harming the environment or rescue personnel.

In the prior art, cement-based anti-radiation material is a common γ-ray shielding material, mainly including anti-radiation concrete and anti-radiation mortar. The anti-radiation concrete is represented by barite anti-radiation concrete. The common ratio is: cement : barite gravel: barite sand: water = 1:4.54:3.4:0.5; anti-radiation mortar is represented by barite mortar, and the common ratio is: cement: barite sand = 1:5.96. Traditional cement-based radiation protection materials have the advantages of wide source of raw materials, easy construction, good plasticity, etc., but also have long setting time, high porosity, easy segregation, poor construction, large volume, shielding performance and mechanical properties, heat resistance and Radiation resistance is difficult to be compatible and other shortcomings. This is because the ordinary Portland cement used in traditional cement-based radiation protection materials has low density, low crystal water content, and poor high temperature resistance, so it is difficult to quickly realize the shielding function against radioactive substances or rays in emergency treatment.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a magnesium phosphate cement-based gamma-ray rapid shielding with early strength and quick hardening, good environmental adaptability, excellent gamma-ray shielding performance, simple process operation, low carbon and environmental protection Materials and their preparation methods.

In order to achieve the above object, the present invention adopts dead burnt magnesia, potassium dihydrogen phosphate as cementing material, borax as retarder, barite, lead oxide, metal lead, magnetite single-doped or double-doped as shielding The gamma ray component is used to prepare the gamma ray fast shielding material.

The content of the present invention is: a magnesium phosphate cement-based γ-ray rapid shielding material, which is characterized in that: 5-40% of dead-burned magnesia, 10-35% of potassium dihydrogen phosphate, 1-15% of borax, and barite 20-70% raw material components and mass percentages of one or more mixtures of lead oxide, metallic lead, and magnetite, and water composition accounting for 10-20% of the total mass of solids: take each raw material component , after mixing evenly, adding water and stirring to form and curing naturally, the magnesium phosphate cement-based γ-ray rapid shielding material is obtained.

The water that accounts for 10% to 20% of the total mass of solids, that is, the mass percentage of water used in the solid dead burnt magnesia, potassium dihydrogen phosphate, borax, and barite, lead oxide, metallic lead, and magnetite 10-20% of the sum of the raw materials of one or more mixtures.

The content of the present invention is preferably: a magnesium phosphate cement-based γ-ray rapid shielding material, characterized in that: 5-35% of dead-burned magnesia, 10-35% of potassium dihydrogen phosphate, 1-10% of borax, Barite, lead oxide, metallic lead, and a mixture of one or more than two kinds of magnetite, 28-69% of the raw material components and mass percentages, and 12-20% of the total mass of the solids are composed of water: take each The raw material components are uniformly mixed, shaped and cured naturally to obtain a magnesium phosphate cement-based γ-ray rapid shielding material.

Another content of the present invention is: a preparation method of magnesium phosphate cement-based γ-ray rapid shielding material, which is characterized in that the preparation steps are:

a. Ingredients: 5-40% of dead-burned magnesia, 10-35% of potassium dihydrogen phosphate, 1-15% of borax, one or more of barite, lead oxide, metallic lead, and magnetite 20-70% of the raw material components and mass percentage of the mixture, and water accounting for 10-20% of the total solid mass;

b. Mixing: Put dead-burned magnesia, potassium dihydrogen phosphate, borax, and one or more mixtures of barite, lead oxide, metallic lead, and magnetite into the mixing container. Add water and time at the same time, stir at a speed of 140~150r/min (slow stirring) for 15~30s, then stir at a speed of 275~295r/min (fast stirring) for 1.5~3min, stop for 15s, and then press 275~ Stir at a speed of 295r/min (fast stirring) for 3 to 5 minutes to obtain a slurry;

c. Molding the prepared slurry and natural curing (the method is the same as that of the prior art, natural curing for 1 to 28 days) to obtain a magnesium phosphate cement-based γ-ray rapid shielding material.

In another content of the present invention: among the raw materials described in step a, the dead burnt magnesia is ground to a particle size of 10-50 μm, barite, lead oxide, metallic lead, and magnetite are respectively ground to a particle size of 5-50 μm, and potassium dihydrogen phosphate (can be industrial grade) is ground to a particle size of 30-150 μm.

In another content of the present invention: the step a is replaced with ingredients: 5-35% of dead-burned magnesia, 10-35% of potassium dihydrogen phosphate, 1-10% of borax, barite, lead oxide, and metallic lead 28-69% of raw material components and mass percentage of one or more mixtures of magnetite ores, and 12-20% of water in the total mass of solids.

In the content of the present invention and another content: the main chemical component of the dead-burned magnesia is MgO, the content is not less than 85%; the main chemical component of borax is Na ₂ B ₄ O ₇ ·10H ₂ O, the content is not low The main chemical composition of barite powder is BaSO ₄ , with a content of not less than 80%; the main chemical composition of magnetite is Fe ₃ O ₄ , which is often written as a composite form of Fe ₂ O ₃ and FeO, where Fe ₂ O ₃ not less than 65%, and FeO not less than 25%; the percentages mentioned above are mass percentages.

Compared with the prior art, the present invention has the following characteristics and beneficial effects:

(1) adopt the present invention, dead burnt magnesia and potassium dihydrogen phosphate are cementitious materials, and borax is retarder, and barite, magnetite, metallic lead and oxides thereof are shielding components; Reaction mechanism is: After magnesium phosphate cement is mixed with water, KH ₂ PO ₄ dissolves first, H ₂ PO ₄ ^- makes the solution acidic, Mg ²⁺ produced by dissolving dead burnt magnesia under acidic conditions, reacts with K+, H ₂ PO ₄ ^- and PO ₄ ^3- quickly reacts to generate MgKPO ₄ 6H ₂ O; the chemical reaction formula is: MgO+KH ₂ PO ₄ +5H ₂ O→MgKPO ₄ 6H ₂ O; B ₄ O ₇ ² dissolved in borax during the whole reaction process ^- Cover the surface of dead-burned magnesia to prevent its further reaction, and act as a retarder; because the above reaction is an exothermic reaction, the heat release of hydration is relatively concentrated and the heat release is large, and the setting and hardening speed is fast; at the same time, magnesium phosphate cement has ceramic characteristics, phase change is not easy to occur when the temperature changes; the doped heavy component interacts with the γ-ray γ particle flow, and the entire photon is absorbed by the atom. At the same time, the bonding strength of the system is high, and the heavy component is not easy to delaminate. Good fluidity, uniform dispersion of heavy components, good compactness, and less penetration of gamma rays, so it has good shielding properties; since magnesium phosphate cement is a kind of non-burning cement, it does not emit CO2 _and nitrogen oxides, so the manufacturing The result is a green and environmentally friendly cement-based material;

(2) By adopting the present invention, the γ-ray rapid shielding material prepared by magnesium phosphate cement has excellent characteristics such as early strength and fast hardening, and its 3h compressive strength can reach more than 30MPa, and the setting time is 10-30min, which improves the ordinary cement-based shielding The material has long setting time and low early strength;

(3) By adopting the present invention, the γ-ray fast shielding material prepared by magnesium phosphate cement has excellent characteristics such as high bonding strength and good high temperature stability, and its 1d bonding strength can reach 3.1MPa, which improves the adhesion of ordinary cement-based radiation protection materials. The defect of low bonding strength;

(4) Adopt the present invention, the gamma ray shielding material that utilizes magnesium phosphate cement to prepare has excellent characteristics such as fluidity is good, porosity is low, shielding property is good, with reference to the test method of fluidity of grouting material, its fluidity is higher than 260mm, porosity If the ratio is lower than 20%, the heavy components are more uniformly dispersed, the compactness is good, and the shielding effect on gamma rays is good. Improve the deficiencies of poor shielding effect caused by large porosity of anti-radiation concrete and anti-radiation mortar;

(5) Magnesium phosphate cement, also known as chemically bonded ceramics, not only has the advantages of hydraulicity and plasticity of ordinary Portland cement, but also has the characteristics of high compressive strength, high temperature resistance, and good chemical stability of ceramics; its early strength is high , fast hardening time, good fluidity, high bonding strength, compact structure, strong environmental adaptability, good durability, and meet the conditions required for rapid shielding material substrates; therefore, dead burnt magnesia, phosphate and borax are selected Composed of magnesium phosphate cement as a base material, mixed with a certain amount of barite, magnetite, lead oxide powder and/or metal lead powder as a gamma ray shielding material, to prepare an early-strength, quick-hardening, and good environmental adaptability , A new type of cement-based anti-radiation material with good shielding performance against gamma rays, which is of great significance for quickly shielding gamma rays;

(6) The preparation process of the product of the present invention is simple, and the gamma ray shielding material prepared is particularly suitable for radiation protection materials that are shielded by the gamma rays produced by reactors, particle accelerators and radioactive source devices, and the hardening time of the material In less than 30 minutes, a gamma-ray shielding body with sufficient strength can be formed in a short time, which is very practical.

Detailed ways

The embodiment given below intends to further illustrate the present invention, but can not be interpreted as limiting the protection scope of the present invention, those skilled in the art make some non-essential improvements and adjustments to the present invention according to the content of the above-mentioned present invention, still belong to protection scope of the present invention.

Example 1:

The γ-ray rapid shielding material prepared by magnesium phosphate cement has the following composition and mass percentage of raw materials:

Dead burnt magnesia: 34wt%,

Potassium dihydrogen phosphate: 34wt%,

Barite powder: 29wt%,

Borax: 3wt%,

Water: accounts for 18wt% of the total mass of the above solids.

The method of using magnesium phosphate cement and barite powder to prepare γ-ray rapid shielding materials is as follows: firstly, grind the dead-burned magnesia, potassium dihydrogen phosphate, and barite to the particle size range required in the technical plan, and then re-burn Magnesia, potassium dihydrogen phosphate, barite powder and borax are used as raw materials. After measuring according to the ratio, mix them evenly to prepare a powder; add water and stir slowly for 15 seconds, stir quickly for 1.5 minutes, stop for 15 seconds, and stir quickly for 3 minutes. The γ-ray rapid shielding material was prepared by stirring, and the size of the formed test block was 100×100×60 mm.

Example 2:

The γ-ray rapid shielding material prepared by magnesium phosphate cement has the following composition and mass percentage of raw materials:

Dead burnt magnesia: 15wt%,

Potassium dihydrogen phosphate: 15wt%,

Lead oxide powder: 69wt%,

Borax: 1wt%,

Water: accounts for 20wt% of the total mass of the above solids.

The method of using magnesium phosphate cement and barite powder to prepare γ-ray rapid shielding materials is as follows: first, grind dead burnt magnesia, potassium dihydrogen phosphate, and lead oxide to the requirements in the technical plan, and use dead burnt magnesia, potassium dihydrogen phosphate Potassium, lead oxide powder and borax are used as raw materials. After being measured according to the ratio, they are mixed evenly to prepare a powder; the process of adding water is stirred slowly for 15 seconds, stirred quickly for 1.5 minutes, stopped for 15 seconds, and stirred quickly for 3 minutes to prepare gamma rays. Rapid shielding material, the size of the forming test block is 100×100×60mm.

Example 3:

Utilize the gamma ray shielding material that magnesium phosphate cement prepares rapidly, the composition and mass percentage of its raw material are as follows:

Dead burnt magnesia: 24wt%,

Potassium dihydrogen phosphate: 24wt%,

Barite powder: 30wt%

Metal lead powder: 20wt%,

Borax: 2wt%

Water: accounts for 12wt% of the total mass of the above solids.

The method of using magnesium phosphate cement and barite powder to prepare γ-ray rapid shielding material is as follows: firstly, grind the dead burnt magnesia, potassium dihydrogen phosphate, barite, and metallic lead to the range required in the technical plan, and use heavy Burnt magnesia, potassium dihydrogen phosphate, barite powder, metal lead powder and borax are used as raw materials. After measuring according to the ratio, mix them evenly to prepare a powder; add water and stir slowly for 15 seconds, stir quickly for 1.5 minutes, and stop for 15 seconds. The γ-ray rapid shielding material was prepared by stirring quickly for 3 minutes, and the size of the formed test block was 100×100×60mm.

Performance test results:

The γ-ray shielding test in Examples 1 to 3 of the present invention uses ¹³⁷ Cs as the radiation source, the source intensity is 4.07×10 ^-8 Bq, and the FJ-3150 X-γ measuring instrument is used;

The properties of gamma ray fast shielding materials are shown in the table below:

Example 4:

A magnesium phosphate cement-based γ-ray rapid shielding material is characterized in that it consists of 22% dead-burned magnesia, 23% potassium dihydrogen phosphate, 7% borax, and 48% barite. Composition of water with 15% of the total mass of solids: take each raw material component, mix it uniformly, add water to stir and shape it, and naturally cure it to obtain a magnesium phosphate cement-based gamma-ray rapid shielding material.

The water accounting for 15% of the total mass of solids, that is, the mass percentage of water used is 15% of the total mass sum of solids dead burnt magnesia, potassium dihydrogen phosphate, borax, and barite raw materials.

Example 5:

A magnesium phosphate cement-based γ-ray rapid shielding material is characterized in that it consists of 40% dead-burned magnesia, 25% potassium dihydrogen phosphate, 15% borax, one of barite, lead oxide, metallic lead, and magnetite 20% raw material components and mass percentages of a mixture of two or more kinds, and water accounting for 10% of the total mass of solids: Take each raw material component, mix it evenly, add water to stir and shape it, and naturally maintain it to obtain phosphoric acid Magnesium cement-based γ-ray rapid shielding material.

Embodiment 6:

A magnesium phosphate cement-based γ-ray rapid shielding material is characterized in that it is composed of 5% dead-burned magnesia, 15% potassium dihydrogen phosphate, 10% borax, one of barite, lead oxide, metallic lead, and magnetite 70% of the raw material components and mass percentages of a mixture of two or more kinds, and 20% of the total solid mass of water: take each raw material component, mix it evenly, add water and stir it into shape, and naturally maintain it to obtain phosphoric acid Magnesium cement-based γ-ray rapid shielding material.

Embodiment 7:

A magnesium phosphate cement-based γ-ray rapid shielding material is characterized in that: 20% of dead burnt magnesia, 25% of potassium dihydrogen phosphate, 5% of borax, one of barite, lead oxide, metallic lead, and magnetite 50% raw material components and mass percentages of a mixture of two or more kinds, and water accounting for 15% of the total mass of solids: Take each raw material component, mix it evenly, add water and stir it into shape, and naturally maintain it to obtain phosphoric acid Magnesium cement-based γ-ray rapid shielding material.

Embodiment 8～14:

A magnesium phosphate cement-based γ-ray rapid shielding material is characterized in that it consists of 5-40% of dead-burned magnesia, 10-35% of potassium dihydrogen phosphate, 1-15% of borax, barite, lead oxide, and metallic lead 20-70% of the raw material components and mass percentages of one or more mixtures of magnetite ores, and 10-20% of the total mass of solids are composed of water: take each raw material component, mix evenly, add water Stirring and natural curing, the magnesium phosphate cement-based γ-ray rapid shielding material is produced;

The water that accounts for 10% to 20% of the total mass of solids, that is, the mass percentage of water used in the solid dead burnt magnesia, potassium dihydrogen phosphate, borax, and barite, lead oxide, metallic lead, and magnetite 10-20% of the mass sum of raw materials of one or more mixtures;

The specific mass percent consumption of each raw material component is shown in the table below in each embodiment:

Note: "one or a mixture" in the table refers to barite, lead oxide, metallic lead, or a mixture of two or more of barite; the mass percentage of "water" in the table refers to the mass of the total mass of solids percentage.

Example 15:

A preparation method of a magnesium phosphate cement-based γ-ray rapid shielding material, the preparation steps are:

a, ingredients: 22% of dead-burned magnesia, 23% of potassium dihydrogen phosphate, 7% of borax, 48% of barite, raw material components and mass percentages, and water accounting for 15% of the total mass of solids;

b. Mixing: Put the dead-burned magnesia, potassium dihydrogen phosphate, borax, and barite into the mixing container, add water to the mixing container and time it at the same time, and stir (slowly stir) 22s at a speed of 145r/min , then stirred (quickly stirred) at a speed of 285r/min for 2.2min, stopped for 15s, and then stirred (quickly stirred) at a speed of 285r/min for 4min to obtain a slurry;

c. Molding the prepared slurry and natural curing (the method is the same as that of the prior art, natural curing for 1 to 28 days) to obtain a magnesium phosphate cement-based γ-ray rapid shielding material.

Example 16:

A preparation method of a magnesium phosphate cement-based γ-ray rapid shielding material, the preparation steps are:

A, batching: according to any batching in embodiment 5～14;

b. Mixing: Put dead-burned magnesia, potassium dihydrogen phosphate, borax, and one or more mixtures of barite, lead oxide, metallic lead, and magnetite into the mixing container. Add water and time at the same time, stir at a speed of 140r/min (slow stirring) for 30s, then stir at a speed of 275r/min (fast stirring) for 3min, stop for 15s, then stir at a speed of 275r/min (fast stirring) 5min, make slurry;

c. Molding the prepared slurry and natural curing (the method is the same as that of the prior art, natural curing for 1 to 28 days) to obtain a magnesium phosphate cement-based γ-ray rapid shielding material.

Example 17:

A preparation method of a magnesium phosphate cement-based γ-ray rapid shielding material, the preparation steps are:

A, batching: according to any batching in embodiment 5～14;

b. Mixing: Put dead-burned magnesia, potassium dihydrogen phosphate, borax, and one or more mixtures of barite, lead oxide, metallic lead, and magnetite into the mixing container. Add water and time at the same time, stir at a speed of 150r/min (slow stirring) for 15s, then stir at a speed of 295r/min (fast stirring) for 1.5min, stop for 15s, then stir at a speed of 295r/min (fast stirring) ) 3min to make a slurry;

c. Molding the prepared slurry and natural curing (the method is the same as that of the prior art, natural curing for 1 to 28 days) to obtain a magnesium phosphate cement-based γ-ray rapid shielding material.

Example 18:

A preparation method of a magnesium phosphate cement-based γ-ray rapid shielding material, the preparation steps are:

A, batching: according to any batching in embodiment 5～14;

b. Mixing: Put dead-burned magnesia, potassium dihydrogen phosphate, borax, and one or more mixtures of barite, lead oxide, metallic lead, and magnetite into the mixing container. Add water and time at the same time, stir at a speed of 143r/min (slow stirring) for 18s, then stir at a speed of 280r/min (fast stirring) for 1.8min, stop for 15s, then stir at a speed of 280r/min (fast stirring) ) 3.5min, make slurry;

c. Molding the prepared slurry and natural curing (the method is the same as that of the prior art, natural curing for 1 to 28 days) to obtain a magnesium phosphate cement-based γ-ray rapid shielding material.

Example 19:

A preparation method of a magnesium phosphate cement-based γ-ray rapid shielding material, the preparation steps are:

A, batching: according to any batching in embodiment 5～14;

b. Mixing: Put dead-burned magnesia, potassium dihydrogen phosphate, borax, and one or more mixtures of barite, lead oxide, metallic lead, and magnetite into the mixing container. Add water and time at the same time, stir at a speed of 148r/min (slow stirring) for 26s, then stir at a speed of 290r/min (fast stirring) for 2.5min, stop for 15s, then stir at a speed of 290r/min (fast stirring) ) 4.5min, make slurry;

c. Molding the prepared slurry and natural curing (the method is the same as that of the prior art, natural curing for 1 to 28 days) to obtain a magnesium phosphate cement-based γ-ray rapid shielding material.

In the above examples: among the raw materials described in step a, the dead-burned magnesia is ground to a particle size of 10-50 μm, barite, lead oxide, metallic lead, and magnetite are respectively ground to a particle size of 5-50 μm , Potassium dihydrogen phosphate (can be industrial grade) is ground to a particle size of 30-150 μm.

In the above examples: the main chemical composition of the dead-burned magnesia is MgO, the content is not less than 85%; the main chemical composition of borax is Na ₂ B ₄ O ₇ ·10H ₂ O, the content is not less than 95%; The main chemical composition of spar powder is BaSO ₄ , with a content of not less than 80%; the main chemical composition of magnetite is Fe ₃ O ₄ , which is often written as a composite form of Fe ₂ O ₃ and FeO, of which Fe ₂ O ₃ is not less than 65% %, FeO is not less than 25%; said each percentage is a mass percentage.

In above-mentioned embodiment: each raw material that adopts is commercially available product.

In the above-mentioned embodiments: among the percentages used, those not specified are all percentages by mass (weight) or percentages known to those skilled in the art; the parts by mass (weight) can be grams or kilograms; wt% is mass (weight) percentage.

Among the above-mentioned embodiments: the process parameters (temperature, time, concentration, speed, etc.) in each step and the numerical value of the amount of each component are within the range, and any point is applicable.

The content of the present invention and the technical content not specifically described in the above embodiments are the same as the prior art.

The present invention is not limited to the above-mentioned embodiments, and all of the contents of the present invention can be implemented and have the above-mentioned good effects.

Claims (5)

1. a magnesium phosphate cement base gamma-rays Rapid shielding material, it is characterized in that: by reheating magnesia 5～40%, potassium primary phosphate 10～35%, borax 1～15%, feed composition and the mass percent of the mixture 20～70% of one or more in barite, plumbous oxide, metallic lead, magnetic iron ore, and the water that accounts for solids total mass 10～20% forms: get each feed composition, through mixing, add water, stir moulding natural curing, make magnesium phosphate cement base gamma-rays Rapid shielding material.

2. a magnesium phosphate cement base gamma-rays Rapid shielding material, it is characterized in that: by reheating magnesia 5～35%, potassium primary phosphate 10～35%, borax 1～10%, feed composition and the mass percent of the mixture 28～69% of one or more in barite, plumbous oxide, metallic lead, magnetic iron ore, and the water that accounts for solids total mass 12～20% forms: get each feed composition, through mixing, add water, stir moulding natural curing, make magnesium phosphate cement base gamma-rays Rapid shielding material.

3. a preparation method for magnesium phosphate cement base gamma-rays Rapid shielding material, is characterized in that preparation process is:

A, batching: by reheating magnesia 5～40%, potassium primary phosphate 10～35%, borax 1～15%, feed composition and the mass percent of the mixture 20～70% of one or more in barite, plumbous oxide, metallic lead, magnetic iron ore, and the water composition that accounts for solids total mass 10～20%;

B, mixing: by reheating magnesia, potassium primary phosphate, borax, and one or more the mixture in barite, plumbous oxide, metallic lead, magnetic iron ore puts in mixing vessel, in mixing vessel, adding water timing simultaneously, by speed stirring 15～30s of 140～150r/min, then by the speed of 275～295r/min, stir 1.5～3min, stop after 15s, then stir 3～5min by the speed of 275～295r/min, make slurry;

C, by the slurry making through moulding, natural curing, make magnesium phosphate cement base gamma-rays Rapid shielding material.

4. by the preparation method of magnesium phosphate cement base gamma-rays Rapid shielding material described in claim 3, it is characterized in that: described in step a in each raw material, by reheating magnesia grinding to particle diameter be 10～50 μ m, barite, plumbous oxide, metallic lead, magnetic iron ore respectively grinding to particle diameter be 5～50 μ m, it is 30～150 μ m that potassium dihydrogen phosphate is milled to particle diameter.

5. by the preparation method of magnesium phosphate cement base gamma-rays Rapid shielding material described in claim 3 or 4, it is characterized in that: described step a replaces with batching: by reheating magnesia 5～35%, potassium primary phosphate 10～35%, borax 1～10%, barite, plumbous oxide, metallic lead, the feed composition of the mixture 28～69% of one or more in magnetic iron ore is according to corresponding mass per-cent, through mixing, with account for stirring according to described step b mode of solids total mass 12～20%, make slurry, through the maintenance of step c mode, make cement based gamma-rays Rapid shielding material.