Radiation-proof brick taking tailings as raw material and preparation method of radiation-proof brick

Abstract

The invention discloses an anti-radiation brick taking tailings as a raw material and a preparation method of the anti-radiation brick, and belongs to the technical field of radiation protection. The brick is prepared from the following raw materials in parts by weight: 2200 to 2500 parts of barite tailing slag sand, 1200 to 1600 parts of barite tailing mud, 300 to 500 parts of sintered powder of barite tailing slag and zeolite, 330 to 400 parts of cement, 40 to 70 parts of fly ash, 80 to 120 parts of granulated blast furnace slag micro powder, 250 to 350 parts of water, 30 to 55 parts of bismuth ore powder and 15 to 30 parts of a water reducing agent. And carrying out static pressure by adopting a press with the pressure of 500 tons and above. Protrusions and grooves matched with each other or grooves are arranged on the long edges and the wide edges of the brick. The preparation method of the sintered powder of the barite tailing slag and the zeolite comprises the following steps: mixing the barite tailing slag and the zeolite, ball-milling, sintering and crushing to obtain the sintered powder of the barite tailing slag and the zeolite; the barite tailing slag and the barite tailing mud are slag and slime obtained by barite reselection respectively.

Description

Technical Field

[0001] The invention relates to the field of radiation protection technology, and in particular to a radiation protection brick using tailings as a raw material and a preparation method thereof. Background Art

[0002] As various ionizing radiations are used more and more widely in industrial society, the requirements for protective hygiene of relevant staff are also getting higher and higher. At present, the anti-ionizing radiation composite materials used in China have always been limited to using lead or lead compounds as the main additives to prevent the harm of ionizing radiation to the human body. They are mainly used for protection of x-rays, gamma rays, alpha surface contamination, beta surface contamination, and hospital radiation equipment room staff, non-destructive testing protection, nuclear protection, etc., but lead itself is toxic and can easily cause physical harm to relevant users, and also pollute the environment. Lead is a toxic heavy metal that is extremely harmful to the human body. Therefore, after lead and its compounds enter the body, they will cause harm to multiple systems such as the nervous, hematopoietic, digestive, kidney, cardiovascular and endocrine systems. If the content is too high, it will cause lead poisoning. The "Guidelines for Childhood Lead Poisoning" (1982) in developing countries stipulates that blood lead levels exceeding or equal to 100ug / L can be diagnosed as lead poisoning regardless of whether there are corresponding clinical symptoms, physical symptoms and other blood biochemical changes, and the blood lead level of children is divided into five levels to indicate different lead load states.

[0003] Level I: <100ug / L. Relatively safe (but already fetal toxic, prone to miscarriage, premature birth, and intrauterine growth retardation of the fetus).

[0004] Level II: 100-199ug / L. It can affect nerve conduction velocity and cognitive ability, making children prone to dizziness, irritability, inattention and hyperactivity.

[0005] Level III: 200-449ug / L. It can cause calcium deficiency, zinc deficiency, iron deficiency, growth retardation, low immunity, motor incoordination, visual and hearing damage, slow reaction, decreased IQ, anorexia, pica, anemia, abdominal pain, etc.

[0006] Grade IV: 450-699ug / L. Personality changes, irritability, aggressive behavior, learning difficulties, abdominal colic, hypertension, arrhythmia and movement disorders may occur.

[0007] Grade V: ≥700ug / L. Can cause multiple organ damage, lead encephalopathy, paralysis, coma and even death.

[0008] In addition, lead will produce lead smoke or lead vapor during processing (such as welding) or high temperature (such as fire), which is particularly harmful. Due to the serious harm that lead brings to the human body and the environment, countries such as Europe and the United States have restricted the use of lead-containing products in their own countries.

[0009] In order to avoid the use of lead, barite can be used as a raw material in the prior art to prepare radiation-proof building materials (mortar or bricks, etc.). In the prior art, barite sand, barite powder, cement and other auxiliary materials are used as raw materials for preparation.

[0010] For example, the patent with application number CN201410062184.4 discloses a lead-free anti-ionizing radiation composite material, which contains 30-95% of radiation protection powder material and 5-70% of molding material by weight; wherein, relative to the total weight of the composite material, the powder material contains 9-24% barium sulfate powder, 2-15% iron oxide powder, 30-50% tungsten and its compounds, and 1-10% cadmium and its compounds.

[0011] For example, the association standard T / CBMF 104-2021 "Assembled radiation protection panels for square cabin hospitals" mainly uses barite as raw material, and requires that the barium sulfate content in the barite be greater than 80%.

[0012] Barite (BaSO4) is an important barium-containing mineral with the characteristics of high specific gravity (4.3-4.7), low hardness (3.0-3.5), stable chemical properties, insolubility in water and acid, etc. It is mainly used in industrial sectors such as petroleum, chemical, paint, and filler.

[0013] The utilization of pure barite mines in my country is relatively good, but there are still a large number of associated barite mines, which are generally of low quality, and barite is not well recovered comprehensively. The industrial grade of barite mining is 50%, the boundary grade is 30%, and the BaSO4 content is less than 30% belongs to low-grade barite mines. Therefore, the preparation of barite requires beneficiation of barite ore. In the prior art, gravity separation, flotation and magnetic separation can be used to beneficiate barite. For the gravity separation process, 10-20% tailings will be produced. Among them, about 2 / 3 of the tailings are barite tailings slag, and about 1 / 3 are barite tailings mud.

[0014] There is no better treatment method for barite tailings in the existing technology. It is usually treated by common stacking method (building tailings ponds or tailings dams, etc.), which puts great pressure on environmental protection, requires a large amount of space, is prone to secondary geological disasters, easily pollutes the soil and groundwater, and requires a lot of money for maintenance; in addition, it also wastes limited mineral resources. Summary of the invention

[0015] In order to solve the above problems, this patent provides a radiation-proof brick using tailings as raw materials and a preparation method thereof. Using cheap barite tailings as raw materials can not only consume tailings and reduce the pressure of solid waste treatment, but also obtain building materials with excellent protection ability and excellent strength. The scheme is as follows: On the one hand, an embodiment of the present invention provides a radiation-proof brick with tailings as raw materials, which is made of the following raw materials in parts by weight: 2200-2500 parts of barite tailings sand, 1200-1600 parts of barite tailings mud, 300-500 parts of sintered powder of barite tailings and zeolite, 330-400 parts of cement, 40-70 parts of fly ash, 80-120 parts of granulated blast furnace slag powder, 250-350 parts of water, 30-55 parts of bismuth ore powder and 15-30 parts of water reducer.

[0016] Among them, the particle size of bismuth ore powder is 50-150μm. The particle size of barite tailings sludge is 50-200 mesh. The particle size of barite tailings sludge separated by gravity selection is 50-200 mesh, so no other treatment is required, and only a slight drying is required (for convenience of storage and batching. Since water is required, it can be dried slightly to reduce energy consumption). The particle size of fly ash is less than 50μm; specifically, the fly ash is grade II fly ash. The particle size of granulated blast furnace slag powder is less than 50μm; specifically, the granulated blast furnace slag powder is S95 grade granulated blast furnace slag powder. Specifically, cement is po42.5 cement. Specifically, the water reducer is selected from one or more of calcium lignin sulfonate, sodium lignin sulfonate and magnesium lignin sulfonate.

[0017] The bricks are formed by static pressing with a pressure of 500 tons or more, and the pressure of a single brick is greater than 50 tons. Preferably, the bricks are formed by static pressing with a pressure of 800 tons or more, and the pressure of a single brick is greater than 60 tons. In the actual production process, multiple bricks can be pressed at one time, such as 4 bricks, 8 bricks or 16 bricks.

[0018] In this patent, due to the use of a large pressure for static pressing, the surface of the brick is smooth, resulting in poor bite and mortar adhesion of the brick, which does not meet the construction standards. The brick needs to be processed, and the four sides of the brick body 1 (except the four sides of the upper and lower surfaces) need to be processed (molded) with protrusions 2 and grooves 3 or both have grooves 3. The long side and wide side of the brick are provided with mutually matching protrusions 2 and grooves 3 or both have grooves 3 (shallow, vertically arranged, preferred).

[0019] In addition, since a higher pressure is used in this patent (to increase the bulk density of the brick), if refined barite is used as in the prior art, the surface of the brick will be very smooth and not convenient to use; while the use of barite tailings slag sand not only consumes the barite tailings, but also makes the surface of the brick not very smooth (such as Figure 7-8 as shown), which is conducive to bricklaying.

[0020] The preparation method of the sintered powder of barite tailings and zeolite is as follows: the barite tailings and zeolite are mixed in a weight ratio of 1:1.4-1.8, then ball-milled to 50-200 mesh, and then sintered at 650-760°C for 3-5h, and crushed to less than 3mm after sintering. In this patent, the sintered powder of barite tailings and zeolite has multiple functions: (1) Barite tailings are in excess relative to barite tailings mud, and the excess barite tailings are consumed by sintering the barite tailings with zeolite powder to produce a more positive effect.

[0021] (2) Equivalent to cement, sintered powder contains barium silicate and its analogues, which has higher strength than conventional cement.

[0022] (3) Barite and zeolite are sintered to form a relatively open silicate structure (channel stability) such as silicon-oxygen and aluminum-oxygen tetrahedrons, which can absorb other smaller powder structures and increase the bulk density of the brick.

[0023] (4) The surface of zeolite has a large electrostatic force, and cations are distributed in its lattice holes; the lattice oxygen frame of the tetrahedral framework has negative charges, which can form an electric field and enhance the radiation protection effect.

[0024] Among them, barite tailings and barite tailings mud are slag and mud obtained by re-selecting barite (using a jig). The barite tailings (average particle size of about 30mm) are crushed to 0-8mm, and then graded to obtain barite tailings sand. Among them, the grading scheme is: 2-8mm accounts for 50-60%, and the remainder is 0-2mm. Specifically, the density of barite tailings is 3.0-3.6g / cm 3 , the barium sulfate content is less than 45%. The water content of barite tailings mud (dried after gravity separation) is less than 5%.

[0025] Preferably, the radiation-proof bricks with tailings as raw materials provided by the present invention are made of the following raw materials in parts by weight: 2400 parts of barite tailings sand, 1300 parts of barite tailings mud, 450 parts of sintered powder of barite tailings and zeolite, 350 parts of po42.5 cement, 55 parts of grade II fly ash, 100 parts of S95 grade granulated blast furnace slag powder, 310 parts of water, 40 parts of bismuth ore powder and 25 parts of water reducer. Among them, the grading scheme of barite tailings sand is: 2-8mm accounts for 55%, and the balance is 0-2mm; the water content of barite tailings mud is less than 3%, and the water reducer is selected from one or more of calcium lignin sulfonate, sodium lignin sulfonate and magnesium lignin sulfonate.

[0026] In one embodiment of the present invention, the brick has a size of 240 mm*115 mm*50-60 mm. Figure 6The grooves 3 are trapezoidal grooves (larger outside and smaller inside, perpendicular to the sides, specifically isosceles trapezoidal grooves) and are evenly distributed. The two long sides of the brick body 1 of the brick are provided with 5-12 grooves 3 side by side along the direction in which they are located, and the two wide sides are provided with 1-3 grooves 3 side by side along the direction in which they are located (if there are multiple grooves). The depth of the grooves 3 is 1-3mm. This brick is mainly used in hospitals, and the grooves 3 are very shallow, which reduces the use of mortar and improves the protective effect. Specifically, the specifications of the brick are 240mm*115mm*53mm or 240mm*115mm*60mm, such as Figure 6 As shown, the long side of the brick is provided with 7 grooves 3 in parallel along the direction in which it is located, and the wide side is provided with 3 grooves 3. The depth of the groove 3 is 1.5 mm, the length of the bottom side (outside) is 13 mm, and the length of the top side (inside) is 10 mm. The wall is built in an I-shaped manner.

[0027] In another embodiment of the present invention, the groove 3 is wavy and arranged vertically; 1-2 grooves 3 are arranged side by side vertically on one long side and one wide side of the brick body 1 (if there are multiple grooves 3), and 1-2 protrusions 2 are arranged side by side vertically on the other long side and the other wide side; the depth of the groove 3 is 15-23mm, specifically 19mm. The brick is mainly used for industrial flaw detection and is easy to construct. Figure 1-3 As shown, two grooves 3 are arranged side by side on one long side and one wide side of the brick. Figure 4-5 As shown, a groove 3 is provided on one long side and one wide side of the brick, and the specification of the brick is 240mm*115mm*50-60mm. For the double groove 3 structure, the brick is thicker, such as 120mm, and has a higher protection capability.

[0028] On the other hand, an embodiment of the present invention further provides a method for preparing radiation-proof bricks using tailings as raw materials, comprising the following steps: S101 ingredients: mix barite tailings sand, barite tailings mud, sintered powder of barite tailings and zeolite, cement, fly ash, granulated blast furnace slag powder, water, bismuth ore powder and water reducing agent according to the proportion, stir evenly and let it stand for 20-30 minutes.

[0029] S102 Pressing: Add the mixed raw materials into the corresponding mold and use a press to statically press to obtain a rectangular brick body.

[0030] S103 maintenance: 20-36h.

[0031] The advantages of the present invention are: (1) It can consume a large amount of barite tailings (including barite tailings slag sand and barite tailings mud), and through special means (the excess barite tailings slag sand is used as sintering powder), the barite tailings slag sand and barite tailings mud produced by gravity separation are basically consumed according to the production ratio, so that barite ore dressing does not produce solid waste, reduces environmental pressure, does not occupy space, and does not need to continuously spend money on tailings maintenance.

[0032] (2) Using barite tailings as raw materials can reduce costs while ensuring radiation protection effects. In the prior art, the price of selected barite is 400-1000 yuan / ton, and the average is more than 600 yuan / ton. The price of barite tailings is less than 30 yuan / ton. In fact, it is usually necessary to spend extra money to let a specialized solid waste treatment agency handle it. Although heavy metal ore powder is used, the cost of a single standard brick is 8-10 yuan, which is lower than the cost of not using heavy metal ore powder but using barite with a content of more than 80%.

[0033] (3) The radiation protection effect is equivalent to the existing technology and meets the industry standard. Specifically, the lead equivalent of a 53mm thick brick is greater than 10.8mmPb (the radiation source is cesium-137, gamma ray, according to the national standard detection method); the lead equivalent of a 60mm thick brick is greater than 11.5mmPb.

[0034] (4) It has good fire resistance, compressive strength greater than 14.0mPa, compression strength above 38mPa, and bulk density of 3.2-3.6kg / cm 3 The roughness of the surface is appropriate and meets the construction standards, reducing the use of mortar (if the surface is smooth and the ability to bite each other is insufficient, more mortar will be needed for connection. The mortar is cured under normal pressure and the protective effect is not as good as bricks). BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic structural diagram of radiation-proof bricks using tailings as raw materials under a solution provided by an embodiment of the present invention; Figure 2 yes Figure 1 A top view of Figure 3 yes Figure 1 Side view of Figure 4 yes Figure 1 A top view with a groove or protrusion on all four sides; Figure 5 yes Figure 1 Side view with a groove or protrusion on all four sides; Figure 6 A schematic structural diagram of radiation-proof bricks using tailings as raw materials under another solution provided by an embodiment of the present invention; Figure 7This is a physical picture of a radiation-proof brick made of tailings as raw materials provided by an embodiment of the present invention; Figure 8 This is an enlarged view of the surface of a radiation-proof brick made of tailings as a raw material provided by an embodiment of the present invention; Fig. 9 It is a comparison diagram of Example 1, Comparative Example 5 and Comparative Example 6.

[0036] In the figure: 1 brick body, 2 protrusions, 3 grooves. DETAILED DESCRIPTION

[0037] The invention is further described below through specific examples, but it should be noted that these examples are merely illustrative and do not limit the scope of the invention.

[0038] Example 1 Example 1 provides a radiation-proof brick using tailings as raw materials, which is made of the following raw materials in parts by weight: 2400 parts of barite tailings sand, 1300 parts of barite tailings mud, 450 parts of sintered powder of barite tailings and zeolite, 350 parts of po42.5 cement, 55 parts of grade II fly ash, 100 parts of S95 grade granulated blast furnace slag powder, 310 parts of water, 40 parts of bismuth ore powder and 25 parts of sodium lignin sulfonate. Among them, the grading scheme of barite tailings sand is: 2-8mm accounts for 55%, and the balance is 0-2mm; the water content of barite tailings mud is less than 3%.

[0039] The preparation method of the sintered powder of barite tailings and zeolite is as follows: the barite tailings and zeolite are mixed in a weight ratio of 1:1.5, ball-milled to 50-200 mesh, and then sintered at 700°C for 4 hours, and crushed to less than 3 mm after sintering.

[0040] The specifications of the bricks are 240mm*115mm*53mm and 240mm*115mm*60mm. The pressure of the press is 800 tons, and 10 bricks can be pressed at a time. Figure 7-8 As shown, it is black and has a suitable surface roughness.

[0041] In this patent, the ratio of the consumption of barite tailings to barite tailings mud is about 1.98, close to 2. The consumption of barite tailings is 77.1% of the weight of the brick, which is a large consumption.

[0042] Example 2 Example 2 provides a radiation-proof brick using tailings as raw materials, which is made of the following raw materials in parts by weight: 2450 parts of barite tailings sand, 1400 parts of barite tailings mud, 400 parts of sintered powder of barite tailings and zeolite, 330 parts of po42.5 cement, 55 parts of Class II fly ash, 110 parts of S95-grade granulated blast furnace slag powder, 340 parts of water, 35 parts of bismuth ore powder and 20 parts of magnesium lignin sulfonate. Among them, the grading scheme of barite tailings sand is: 2-8mm accounts for 55%, and the balance is 0-2mm; the water content of barite tailings mud is less than 3%.

[0043] The preparation method of the sintered powder of barite tailings and zeolite is as follows: the barite tailings and zeolite are mixed in a weight ratio of 1:1.7, ball-milled to 50-200 mesh, and then sintered at 700°C for 4 hours, and crushed to less than 3 mm after sintering.

[0044] Among them, the specifications of the bricks are 240mm*115mm*53mm and 240mm*115mm*60mm. The pressure of the press is 1,000 tons, and 16 bricks can be pressed at the same time.

[0045] In this patent, the ratio of the consumption of barite tailings to barite tailings mud is about 1.86, close to 2. The amount of barite tailings used is greater than 75% of the weight of the brick, and the consumption is large.

[0046] Example 3 Example 3 provides a radiation-proof brick using tailings as raw materials, which is made of the following raw materials in parts by weight: 2200 parts of barite tailings sand, 1200 parts of barite tailings mud, 350 parts of sintered powder of barite tailings and zeolite, 360 parts of po42.5 cement, 50 parts of Class II fly ash, 120 parts of S95-grade granulated blast furnace slag powder, 300 parts of water, 38 parts of bismuth ore powder and 20 parts of sodium lignin sulfonate. Among them, the grading scheme of barite tailings sand is: 2-8mm accounts for 60%, and the balance is 0-2mm; the water content of barite tailings mud is less than 3%.

[0047] The preparation method of the sintered powder of barite tailings and zeolite is as follows: the barite tailings and zeolite are mixed in a weight ratio of 1:1.4, ball-milled to 50-200 mesh, and then sintered at 750°C for 3.5h, and crushed to less than 3mm after sintering.

[0048] Among them, the specifications of the bricks are 240mm*115mm*53mm and 240mm*115mm*60mm, the pressure of the press is 600 tons, and 8 bricks are pressed at the same time. In this patent, the ratio of the consumption of barite tailings to barite tailings mud is about 1.96, close to 2. The amount of barite tailings is greater than 70% of the weight of the brick, and the consumption is very large.

[0049] Example 4 Example 4 provides a radiation-proof brick using tailings as raw materials, which is made of the following raw materials in parts by weight: 2350 parts of barite tailings sand, 1450 parts of barite tailings mud, 500 parts of sintered powder of barite tailings and zeolite, 350 parts of po42.5 cement, 60 parts of grade II fly ash, 90 parts of S95 grade granulated blast furnace slag powder, 310 parts of water, 45 parts of bismuth ore powder, and 20 parts of a mixture of calcium lignin sulfonate and sodium lignin sulfonate (the mass ratio of calcium lignin sulfonate to sodium lignin sulfonate is 1:1). Among them, the grading scheme of the barite tailings sand is: 2-8mm accounts for 60%, and the balance is 0-2mm; the water content of the barite tailings mud is less than 3%.

[0050] The preparation method of the sintered powder of barite tailings and zeolite is as follows: the barite tailings and zeolite are mixed in a weight ratio of 1:1.4, ball-milled to 50-200 mesh, and then sintered at 680°C for 5h, and crushed to less than 3mm after sintering.

[0051] Among them, the specifications of the bricks are 240mm*115mm*53mm and 240mm*115mm*60mm. The pressure of the press is 600 tons, and 10 bricks can be pressed at the same time.

[0052] In this patent, the ratio of the consumption of barite tailings to barite tailings mud is about 1.77, close to 2. The consumption of barite tailings is greater than 75% of the weight of the brick, and the consumption is large.

[0053] The parameters of Examples 1-4 are shown in Table 1: Table 1

[0054] Among them, the bulk density, compressive strength and compression strength are the average values ​​of the two specifications.

[0055] Comparative Example 1 (using conventional method) Comparative Example 1 provides a radiation-proof brick, which is made of the following raw materials in parts by weight: 1185 parts of barite powder, 1525 parts of barite sand (graded according to conventional methods), 320 parts of po42.5 cement, 42 parts of grade II fly ash, 85 parts of S95 grade granulated blast furnace slag powder, 195 parts of water and 14 parts of sodium lignin sulfonate. It is prepared by a conventional vibration press, and the specifications of the brick are 240mm*115mm*60mm. Since the cost of the bismuth ore powder in this embodiment is relatively expensive, the cost of comparative example 1 is similar to that of embodiment 1.

[0056] Comparative Example 2 Comparative Example 2 provides a radiation-proof brick, and its preparation process is consistent with that of Example 1, except that: no sintered powder of barite tailings and zeolite is added.

[0057] Comparative Example 3 Comparative Example 3 provides a radiation-proof brick, and its preparation process is consistent with that of Example 1, except that: instead of adding barite tailings and zeolite sintering powder, 200 parts of po42.5 cement are added.

[0058] Comparative Example 4 Comparative Example 4 provides a radiation-proof brick, whose preparation process is the same as that of Example 1, except that: instead of adding the sintered powder of barite tailings and zeolite, 180 parts of barite tailings (crushed to less than 3 mm) and 270 parts of zeolite (crushed to less than 3 mm) are added.

[0059] Comparative Example 5 Comparative Example 5 provides a radiation-proof brick, which is made of the following raw materials in parts by weight: 1185 parts of barite powder, 1525 parts of barite sand, 320 parts of po42.5 cement, 42 parts of grade II fly ash, 85 parts of S95 grade granulated blast furnace slag powder, 195 parts of water and 14 parts of sodium lignin sulfonate. It is prepared by static pressing (to make the bulk density consistent with that of Example 1), and the specifications of the brick are 240mm*115mm*60mm (for the convenience of preparation, a mold with grooves and protrusions is not used).

[0060] Comparative Example 6 Comparative Example 6 provides a radiation-proof brick, which is made of the following raw materials in parts by weight: 1185 parts of barite powder, 1525 parts of barite sand, 320 parts of po42.5 cement, 42 parts of grade II fly ash, 85 parts of S95 grade granulated blast furnace slag powder, 195 parts of water and 14 parts of sodium lignin sulfonate. The pressing process and pressure are consistent with those in Example 1 (in order to facilitate preparation, a mold with grooves and protrusions is not used). Due to the use of a press with a higher pressure, the equipment cost is amortized, and the cost of comparative example 6 is higher than that of example 1. In addition, the surface of the obtained brick is particularly smooth and does not meet the construction standards.

[0061] The results are shown in Table 2: Table 2

[0062] As can be seen from Table 2, compared with the prior art, this patent has a similar lead equivalent at a slightly lower bulk density. Although higher pressure can obtain higher lead equivalent and bulk density, it will increase costs and be unfavorable to construction (such as Fig. 9 As shown, the surface of the brick of Comparative Example 6 is particularly smooth).

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Radiation-proof bricks made of tailings, characterized in that: The invention is prepared from the following raw materials in parts by weight: 2200-2500 parts of barite tailings sand, 1200-1600 parts of barite tailings mud, 300-500 parts of sintered powder of barite tailings and zeolite, 330-400 parts of cement, 40-70 parts of fly ash, 80-120 parts of granulated blast furnace slag powder, 250-350 parts of water, 30-55 parts of bismuth ore powder and 15-30 parts of water reducing agent; The particle size of the bismuth ore powder is 50-150 μm, the particle size of the barite tailings mud is 50-200 mesh, the particle size of the fly ash is less than 50 μm, and the particle size of the granulated blast furnace slag powder is less than 50 μm; It is made by static pressing with a press of 500 tons or more, and the pressure of a single brick is greater than 50 tons; The long side and the wide side of the brick are provided with mutually matching protrusions and grooves or both are provided with grooves; The preparation method of the sintered powder of barite tailings and zeolite is as follows: the barite tailings and zeolite are mixed in a weight ratio of 1:1.4-1.8, ball-milled to 50-200 mesh, and then sintered at 650-760°C for 3-5h, and crushed to less than 3mm after sintering; The barite tailings and barite tailings mud are slag and mud obtained by reselecting barite respectively; the barite tailings are crushed to 0-8 mm, and then graded to obtain barite tailings sand; wherein the grading scheme is: 2-8 mm accounts for 50-60%, and the remainder is 0-2 mm; The water content of the barite tailings mud is less than 5%.

2. The radiation-proof brick made of tailings as raw materials according to claim 1, characterized in that: The cement is po42.5 cement.

3. The radiation-proof brick made of tailings as raw materials according to claim 1, characterized in that: The fly ash is grade II fly ash.

4. The radiation-proof brick made of tailings as raw materials according to claim 1, characterized in that: The granulated blast furnace slag powder is S95 grade granulated blast furnace slag powder.

5. The radiation-proof brick made of tailings as raw materials according to claim 1, characterized in that: The water reducing agent is selected from one or more of calcium lignin sulfonate, sodium lignin sulfonate and magnesium lignin sulfonate.

6. The radiation-proof brick made of tailings as raw materials according to claim 1, characterized in that: The density of the barite tailings is 3.0-3.6 g / cm 3 .

7. The radiation-proof brick made of tailings as raw materials according to claim 1, characterized in that: The invention is made of the following raw materials in parts by weight: 2400 parts of barite tailings sand, 1300 parts of barite tailings mud, 450 parts of sintered powder of barite tailings and zeolite, 350 parts of po42.5 cement, 55 parts of grade II fly ash, 100 parts of S95 grade granulated blast furnace slag powder, 310 parts of water, 40 parts of bismuth ore powder and 25 parts of water reducer; wherein, the grading scheme of the barite tailings sand is: 2-8mm accounts for 55%, and the balance is 0-2mm; the water content of the barite tailings mud is less than 3%, and the water reducer is selected from one or more of calcium lignin sulfonate, sodium lignin sulfonate and magnesium lignin sulfonate.

8. The radiation-proof brick made of tailings as raw materials according to claim 1, characterized in that: The specification of the brick is 240mm*115mm*50-60mm; the grooves are trapezoidal grooves and are evenly distributed; 5-12 grooves are arranged side by side along the direction of the long side of the brick, and 1-3 grooves are arranged side by side along the direction of the wide side; the depth of the grooves is 1-3mm.

9. The radiation-proof brick made of tailings as raw materials according to claim 1, characterized in that: The grooves are wavy and arranged vertically; 1-2 grooves are arranged side by side on one long side and one wide side of the brick, and 1-2 protrusions are arranged side by side on the other long side and the other wide side; the depth of the grooves is 15-23mm.

10. A method for preparing radiation-proof bricks using tailings as raw materials, characterized in that: The steps include: S101 ingredients: mix barite tailings sand, barite tailings mud, sintered powder of barite tailings and zeolite, cement, fly ash, granulated blast furnace slag powder, water, bismuth ore powder and water reducing agent according to the proportion, stir evenly, and let stand for 20-30 minutes; S102 Pressing: Add the mixed raw materials into the corresponding mold, and statically press the press to obtain a rectangular brick body; S103 maintenance: 20-36h.

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