CN-121974659-A - Radiation-proof brick and preparation method thereof

Abstract

The invention discloses a radiation-proof brick and a preparation method thereof, and belongs to the technical field of radiation-proof materials. The radiation-proof brick comprises the following raw materials, by mass, 15-25 parts of residual solid phase, 55-65 parts of mineral materials, 5-30 parts of carbonaceous fuel and 0.5-1.5 parts of binder after thermal analysis and utilization of oil-containing sludge produced by natural gas, and the radiation-proof brick retains barite in the residual solid phase, so that the brick body has radiation-proof performance, and has excellent application prospect, and compared with concrete with the same barite additive amount, industrial solid waste is consumed, land occupation of solid waste storage and landfill is reduced, the purchase cost of the barite is reduced, resource waste of secondary transfer after the recovery of the barite is reduced, waste recycling is achieved, and contribution is made to environmental protection.

Inventors

• Peng xiaoxi
• LIAO RUIXUE
• ZHENG LINGLING
• Tao Yiqian
• HAN YUQI
• SUN YONGLIANG
• ZENG LIN
• HOU JIANG
• HUANG XIANG

Assignees

• 四川省生态环境科学研究院

Dates

Publication Date

20260505

Application Date

20260309

Claims (9)

1. 1. The radiation-proof brick is characterized by comprising, by mass, 15-25 parts of residual solid phase, 55-65 parts of mineral materials, 5-30 parts of carbonaceous fuel and 0.5-1.5 parts of binder after thermal analysis of oil-containing sludge produced by natural gas, wherein the thermal analysis is carried out by desorbing petroleum hydrocarbons in the oil-containing sludge at 240-550 ℃ and recycling the petroleum hydrocarbons for drilling operation or as fuel.
2. 2. The radiation protection brick of claim 1, wherein the content of barium sulfate in the residual solid phase after thermal analysis and utilization of the oil-containing sludge from natural gas exploitation is 20-40%, and the content of barium sulfate in the radiation protection brick is 5-15%.
3. 3. The radiation protection tile of claim 1, wherein said mineral material is shale, clay or a shale and clay mixture.
4. 4. The radiation protection brick of claim 1, wherein said carbonaceous fuel is middling or gangue.
5. 5. The radiation protection brick of claim 1, wherein the binder is carboxymethyl cellulose or calcium lignosulfonate.
6. 6. The method for preparing the radiation protection brick according to any one of claims 1 to 5, which is characterized by comprising the following steps: S1, enabling residual solid after thermal analysis and utilization of oil-containing sludge produced by natural gas to pass through a vibrating screen with a screen aperture of 40 meshes to obtain a pretreated solid, and if the residual solid after thermal analysis and utilization meets the 40-mesh requirement, skipping the step; S2, mixing the pretreated solid phase with mineral materials, carbonaceous fuel and binder, adding water to adjust the water content to 10% -15%, and stirring at a speed of 40-60 r/min for 15-25 min, wherein the mixture is uniformly mixed and free of agglomerated particles; S3, extruding the stirred raw materials into mud strips, and cutting into green bricks; s4, drying the green bricks by hot air or by waste heat of a brick kiln to obtain dehydrated green bricks; And S5, roasting the dehydrated green bricks to obtain the radiation-proof bricks.
7. 7. The preparation method of the brick according to claim 6, wherein the stirred raw materials are extruded into mud strips by a vacuum pugging machine at the extrusion pressure of 10-15 MPa, and the mud strips are cut into bricks by a brick making machine.
8. 8. The method of claim 6, wherein the hot air or the waste heat of the kiln is used for drying at 80-100 ℃ for 12-16 hours at a wind speed of 0.5-1 m/s.
9. 9. The method of manufacturing according to claim 6, wherein the firing comprises the steps of: (1) A preheating section, wherein the temperature is increased to 300-500 ℃ from normal temperature, the heating rate is 1 ℃ per minute, and the temperature is kept for 2-3 hours; (2) The firing section is to raise the temperature to 900-1000 ℃, raise the temperature rate to 1-1.5 ℃ per minute and keep the temperature for 3-4 hours; (3) And a cooling section for cooling to below 500 ℃ at a speed of 5-10 ℃ per minute, and naturally cooling to normal temperature.

Description

Radiation-proof brick and preparation method thereof Technical Field The invention belongs to the technical field of radiation-proof materials, and particularly relates to a radiation-proof brick and a preparation method thereof. Background With the continuous expansion of the natural gas exploitation scale, the production amount of the oil-containing sludge is increased year by year. The oily sludge contains various pollutants, and if the oily sludge is improperly treated, the oily sludge can pollute the environment. At present, the treatment mode of the oily sludge mainly comprises pyrolysis, chemical cleaning and the like, and the residual solid phase generated after the treatment is generally required to be safely treated. Notably, the addition of barite (barium sulfate as the main component, baSO 4) as a weighting agent to drilling muds used in natural gas production processes has resulted in heavy components in the oily sludge and its treated remaining solid phase. The barite has high density (4.3-4.6 g/cm 3) and good radiation shielding performance, and particularly has strong absorption capacity on X-rays and gamma-rays. The treatment standard of the residual solid phase utilization after the comprehensive utilization of the oil-containing sludge in natural gas exploitation (DB 51/T2850-2021) clearly prescribes that the residual solid phase can be used for making bricks, and provides a basis for realizing the resource utilization. The residual solid phase generated after the treatment of the oily sludge is subjected to a thermal analysis utilization process, so that the content of pollutants is greatly reduced, and the barite is crushed uniformly and finely, thereby providing a potential high-quality raw material for preparing bricks with special properties. In the field of current building materials, the demand for building materials with radiation protection performance is gradually increased, especially in the construction of special places such as scientific research, medical treatment and the like. However, the research of directly utilizing the residual solid phase to prepare the building material with the radiation protection function in the prior art is still blank. The existing related patents of radiation-proof building materials, such as CN109336496A, CN113354349B and CN108793894B, adopt outsourcing barite as radiation-proof raw materials and make concrete, the recycling utilization of residual solid phase of oil-containing sludge in natural gas exploitation is not involved, the existing brick making patent of oil-containing sludge solid waste only focuses on environmental protection treatment, and the radiation-proof function of brick body is not given. Therefore, the development of the method for preparing the radiation-proof brick by utilizing the residual solid phase after the comprehensive utilization of the oil-containing sludge in the natural gas exploitation has important practical significance and application value. Disclosure of Invention Aiming at the prior art, the invention provides the radiation-proof brick and the preparation method thereof, which solve the problems of overhigh cost, complex process and the like of the existing radiation-proof building material. The technical scheme includes that the radiation-proof brick comprises, by mass, 15-25 parts of residual solid phase, 55-65 parts of mineral materials, 5-30 parts of carbonaceous fuel and 0.5-1.5 parts of binder after thermal analysis of oil-containing sludge generated in natural gas exploitation, wherein the thermal analysis is to desorb petroleum hydrocarbons in the oil-containing sludge at 240-550 ℃ and recycle the petroleum hydrocarbons for drilling operation or as fuel. Further, the content of barium sulfate in the residual solid phase after thermal analysis and utilization of the oil-containing sludge produced by natural gas is 20-40%, and the content of barium sulfate in the radiation-proof brick is 5-15%. Further, the mineral material is shale, clay or a mixture of shale and clay. Further, the carbonaceous fuel is middling or gangue. Further, the binder is carboxymethyl cellulose or calcium lignosulfonate. The radiation-proof brick has the beneficial effects that the brick body has radiation-proof performance by retaining barite in the residual solid phase, can be used for building walls needing radiation protection like hospital radiology departments, scientific research laboratories and the like in analogy to concrete with the same barite addition, overcomes the defect that the finished products in the prior art have no radiation-proof function, replaces residual solid phase after the thermal analysis and utilization of natural gas exploitation oily sludge with the barium sulfate content of more than or equal to 25 percent, replaces outsourcing barite raw materials, obviously reduces the purchase cost of the barite, reduces the resource waste of secondary transfer after the recovery of the barite, can effe