Treatment method for precipitation mother liquor and uranium ore leaching residues and building material

Abstract

The invention relates to a treatment method of precipitation mother liquor and uranium ore leaching residues, and relates to the field of uranium ore leaching residue treatment, and the treatment method comprises the following steps: exchanging the precipitation mother liquor through calcium type cation saturated resin to obtain calcium-rich mother liquor; adding calcium oxide into the calcium-rich mother solution to obtain an intermediate solution; adding potassium carbonate into the intermediate solution, stirring and mixing, standing, and filtering to obtain an exciting agent; cement, an additive, the leaching residues and the exciting agent are mixed, cured and formed. The modified precipitation mother liquor is adopted to excite the leaching residues mixed with the cement and the additive, a stable, solidified and high-strength gelling inclusion is formed, radionuclides can be inhibited from being released for a long time, and the radionuclides are prevented from entering environments such as air, water and soil. Recycling of the precipitation mother liquor and the leaching residues is achieved, the treatment amount of waste water and waste materials in the uranium ore leaching process is reduced, and the complexity of the waste water and waste residue treatment process is reduced.

Description

Technical Field

[0001] The invention relates to the field of uranium ore leaching residue disposal, and in particular to a method for treating a precipitated mother liquor and uranium ore leaching residue and a building material. Background Art

[0002] In the uranium ore hydrometallurgy process, uranium in the leaching solution is enriched by ion exchange, and the qualified uranium-containing leaching solution is precipitated with 20-30% sodium hydroxide solution to prepare yellow cake products, and the precipitation end point pH is close to 14. The supernatant is the precipitation mother liquor, which has strong alkalinity, high ion concentration, and carries a small amount of radioactive elements. Part of it is returned to prepare the leaching agent, and the other part is treated as waste liquid. Its treatment generally adopts lime precipitation, clear liquid adsorption and other methods, which consumes more reagents and increases the complexity of the hydrometallurgy process.

[0003] The leaching residue of uranium ore is generally simply piled up, and the internal structure of the pile is loose and needs to be further compacted. In the process of unloading the leaching residue into the tailings pond, the leaching residue is in an exposed state, and there is a risk of its surface dust being carried by the air. At the same time, rain and dew may infiltrate into the leaching residue particles, causing the slow release of radioactive nuclides and producing effluents, which also need to be collected, adsorbed and other treatment operations.

[0004] Therefore, it is urgent to propose a new method for disposing of precipitation mother liquor and leaching residue to reduce the pollution of waste to the environment and achieve cost reduction and efficiency improvement in solid and liquid waste treatment. Summary of the invention

[0005] The purpose of the present invention is to provide a method for treating precipitation mother liquor and uranium ore leaching residue and a building material to improve the above problems. In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A method for treating a precipitated mother liquor and uranium ore leaching residue, comprising:

[0007] The precipitation mother liquor is exchanged through a calcium-type cationic saturated resin to obtain a calcium-rich mother liquor;

[0008] adding calcium oxide to the calcium-rich mother liquor to obtain an intermediate solution;

[0009] Adding potassium carbonate to the intermediate solution, stirring and mixing, allowing to stand, and filtering to obtain an activator;

[0010] The cement, additives, leached residue and the activator are mixed and solidified into a shape.

[0011] Optionally, the additives include Al3O2 and SiO2.

[0012] Optionally, in the additive, Al3O2≥10wt%, SiO2≥15wt%, and the aluminum-oxygen ratio in the additive is 1.2-1.4.

[0013] Optionally, the mass ratio of the activator, cement, additive and leached residue is 100:(58-65):(65-70):(175-185).

[0014] Optionally, the amount of potassium carbonate added is 0.3-0.8wt% of the intermediate solution, and the purity of the potassium carbonate is above 99%.

[0015] Optionally, the NaOH in the precipitation mother liquor is ≤20wt%, and the uranium is ≤5mg / L.

[0016] Optionally, the particle size of the leached residue is 0.15mm-10mm.

[0017] Optionally, the step of adding calcium oxide to the calcium-rich mother liquor to obtain an intermediate solution comprises:

[0018] Add calcium oxide to the calcium-rich mother liquor to adjust the OH content of the calcium-rich mother liquor. - The concentration reaches 1.6-1.8 mol / L.

[0019] Optionally, the mixing of cement, additives, leached residue and the activator and solidification molding comprises:

[0020] The activator, cement, additives and leached residue are mixed to obtain a mixture;

[0021] The mixture is poured into a mold and placed at room temperature for 7-20 days to solidify and form.

[0022] Based on the same inventive concept, the present application also provides a building material, which is produced by the above-mentioned method for treating a precipitation mother liquor and uranium ore leaching residue.

[0023] The beneficial effects of the present invention are:

[0024] The invention modifies the precipitation mother liquor by mixing other components, and the modified precipitation mother liquor is used as an alkali activator, and cement and additives are used to solidify the uranium ore leaching residue to form a stable, solidified, high-strength, and non-precipitated uranium ore leaching residue solidified body, which is convenient for subsequent stacking or utilization. While realizing the reuse of the precipitation mother liquor waste, the leaching residue disposal level is improved, and the reagent consumption and process complexity of waste treatment are reduced.

[0025] Other features and advantages of the present invention will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing embodiments of the present invention. DETAILED DESCRIPTION

[0027] In this application, when it comes to numerical ranges, unless otherwise specified, the above numerical ranges are deemed to be continuous and include the minimum and maximum values ​​of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0028] In the uranium ore hydrometallurgy process, uranium in the leaching solution is enriched by ion exchange, and the qualified leaching solution is precipitated with 20-30% sodium hydroxide solution to prepare yellow cake products, and the precipitation end point pH is close to 14. The supernatant is the precipitation mother liquor, which is highly alkaline and has a high ion concentration. One part is returned to prepare the leaching agent, and the other part is disposed of as waste liquid. The waste liquid of the precipitation mother liquor is generally treated by lime precipitation, clear liquid adsorption and other methods, which consumes a lot of reagents and increases the complexity of the hydrometallurgy process.

[0029] The surface leaching methods of uranium ore include heap leaching, pool leaching, stirring leaching and other processes. The uranium ore needs to be mined from the ore body and transported to the surface for disposal. Generally, the ore is crushed into a certain range of particle sizes by crushing and fine grinding, and then dissolved and leached with acid and alkali leaching agents. After the leaching is completed, the leachate is separated from the solid leaching residue, and the valuable metals are further recovered from the leachate. The pH of the generated leaching residue is mainly adjusted by lime, and then the heavy metals and radionuclides in the effluent are neutralized and precipitated, and then transported to the tailings pond for stacking. The effluent from the tailings pond is disposed of by ion exchange adsorption and other process technologies.

[0030] The above-mentioned leaching residue disposal methods have the following disadvantages: the leaching residue is simply piled up, and the internal structure of the pile is loose and needs to be further compacted; during the unloading process of the leaching residue to the tailings pond, the leaching residue is in an exposed state, the leaching residue particle size is small, and there is a risk of surface dust being carried by the air; rain and dew may infiltrate into the leaching residue particles, causing the slow release of radioactive nuclides and generating carried effluents, which need to be collected, adsorbed, and disposed of.

[0031] In order to solve the problems of the prior art, the present application proposes a method for treating a precipitation mother liquor and uranium ore leaching residue, comprising:

[0032] The precipitation mother liquor is exchanged through a calcium-type cationic saturated resin to obtain a calcium-rich mother liquor;

[0033] adding calcium oxide to the calcium-rich mother liquor to obtain an intermediate solution;

[0034] Adding potassium carbonate to the intermediate solution, stirring and mixing, allowing to stand, and filtering to obtain an activator;

[0035] The cement, additives, leached residue and the activator are mixed and solidified into a shape.

[0036] This application not only reuses the precipitation mother liquor waste, but also improves the technical level of leaching residue disposal, reduces reagent consumption and process complexity. The precipitation mother liquor waste is mixed with other components for modification to obtain an activator, which is then used with cement and additives to solidify the uranium ore leaching residue to form a stable, solidified, high-strength, and non-precipitated uranium ore leaching residue solidified body, which is convenient for subsequent stacking. It effectively reduces the waste liquid disposal and leaching residue pretreatment processes, can suppress the release of radioactive nuclides in the stacking body for a long time, prevent the leaching residue fly ash from entering the air, water, soil and other environments, and achieve cost reduction and efficiency improvement in solid and liquid waste disposal.

[0037] As an optional embodiment, the additive includes Al3O2 and SiO2. The addition of Al3O2 and SiO2 can effectively reduce the precipitation of toxic and harmful elements, while improving the strength of the solidified body, and the uranium concentration in the effluent under immersion conditions is also significantly reduced. More preferably, the Al3O2 in the additive is ≥10wt%, SiO2 is ≥15wt%, and the aluminum-oxygen ratio in the additive is 1.2-1.4. The aluminum-oxygen ratio is also called the aluminum-oxygen rate or the iron rate, which represents the ratio of the aluminum oxide (Al2O3) content to the iron oxide (Fe2O3); the aluminum-oxygen ratio will affect the key properties of the material after solidification, such as strength and crack resistance. Therefore, the present invention has determined through experiments that in this formula, when the aluminum-oxygen ratio of the additive is 1.2-1.4, the material performance reaches the optimal level.

[0038] As an optional embodiment, the mass ratio of the activator, cement, additive and leached residue is 100:(58-65):(65-70):(175-185). More preferably, the ratio of activator:cement:additive:leached residue is 100:60:68:180. The activator obtained by modifying the precipitation mother liquor in the present application is an alkali activator. The alkali activator introduces alkali ions into the concrete to promote the chemical reaction between the silicate minerals in the concrete and water to generate secondary hydration products. These products can fill the microscopic pores inside the concrete and improve the density and durability of the concrete.

[0039] As an optional embodiment, the amount of potassium carbonate added is 0.3-0.8wt% of the intermediate solution, and the purity of the potassium carbonate is above 99%. The present invention has found in research that when only calcium oxide is added, pores are likely to appear inside the solidified body. By adding potassium carbonate, the compactness inside the solidified body can be improved, thereby enhancing the strength of the solidified body. At the same time, there are some impurities in the precipitation mother liquor, and when it is modified, potassium carbonate is added to form a precipitate to remove the impurities.

[0040] As an optional implementation, the NaOH in the precipitation mother liquor is ≤20wt%, and the uranium is ≤5mg / L. The precipitation mother liquor is the supernatant in the process of preparing yellow cake products from the qualified elution liquid, wherein the specific alkali content and uranium content are related to the process of uranium enrichment and elution liquid precipitation steps, and generally the NaOH content does not exceed 20wt%, and the uranium content does not exceed 5mg / L.

[0041] As an optional implementation, the particle size of the leached residue is 0.15mm-10mm. The leached residue mainly includes leached residue from stirring leaching, heap leaching and pool leaching, and the pH range of the leached residue leachate is 6-8.

[0042] As an optional embodiment, the step of adding calcium oxide to the calcium-rich mother liquor to obtain an intermediate solution comprises: adding calcium oxide to the calcium-rich mother liquor, adjusting the OH content in the calcium-rich mother liquor, - The concentration reaches 1.6-1.8 mol / L.

[0043] Although the precipitation mother liquor is alkaline, it is necessary to further increase the OH - content; at the same time, it can also increase the calcium content, improve the strength and durability after coagulation, and the cost of calcium oxide is very low; therefore, the present application adjusts the calcium-rich mother liquor by adding calcium oxide.

[0044] As an optional implementation manner, the mixing of the activator, cement, additives and leached residue and solidification molding comprises:

[0045] The activator, cement, additives and leached residue are mixed to obtain a mixture;

[0046] The mixture is poured into a mold and placed at room temperature for 7-20 days to solidify and form.

[0047] Based on the same inventive concept, the present application also provides a building material, which is produced by the above-mentioned method for treating a precipitation mother liquor and uranium ore leaching residue.

[0048] The following describes the embodiments of the present invention through specific examples.

[0049] Example 1

[0050] A method for treating precipitation mother liquor and uranium ore leaching residue, comprising:

[0051] S1, exchanging the precipitation mother liquor through a calcium type cationic saturated resin to obtain a calcium-rich mother liquor;

[0052] The NaOH content in the precipitation mother solution is 16wt% and the uranium concentration is 2.7mg / L;

[0053] S2, adding calcium oxide to the calcium-rich mother liquor to obtain an intermediate solution;

[0054] Add CaO to the calcium-rich mother liquor, mix and stir for 0.5h, and adjust the OH - Concentration up to 1.6 mol / L;

[0055] S3, adding potassium carbonate to the intermediate solution, stirring and mixing, letting stand, filtering, and obtaining an activator;

[0056] The amount of potassium carbonate added is 0.5wt% of the intermediate solution, the purity of potassium carbonate is above 99%, and the mixture is mixed and stirred for 1h after addition;

[0057] S4, mixing cement, additives, leached residue and the activator, and solidifying and forming;

[0058] The cement is silicate cement; the additive contains 15wt% Al3O2 and 25wt% SiO2, the aluminum-oxygen ratio is 1.2, and the balance is water; and particles with a particle size of 80-100 mesh account for more than 80% of the leached slag.

[0059] The activator: cement: additive: leached residue are mixed in a mass ratio of 100:60:68:180 to obtain a mixture, which is poured into a mold and placed at 15-35° C. for 10 days to solidify.

[0060] Example 2

[0061] A method for treating precipitation mother liquor and uranium ore leaching residue, comprising:

[0062] S1, exchanging the precipitation mother liquor through a calcium type cationic saturated resin to obtain a calcium-rich mother liquor;

[0063] The NaOH content in the precipitation mother solution is 18.1wt% and the uranium concentration is 3.5mg / L;

[0064] S2, adding calcium oxide to the calcium-rich mother liquor to obtain an intermediate solution;

[0065] Add CaO to the calcium-rich mother liquor, mix and stir for 0.5h, and adjust the OH - Concentration up to 1.7 mol / L;

[0066] S3, adding potassium carbonate to the intermediate solution, stirring and mixing, letting stand, filtering, and obtaining an activator;

[0067] The amount of potassium carbonate added is 0.7wt% of the intermediate solution, the purity of potassium carbonate is above 99%, and the mixture is mixed and stirred for 1h after addition;

[0068] S4, mixing cement, additives, leached residue and the activator, and solidifying and forming;

[0069] The cement is silicate cement; the additive contains 20wt% Al3O2 and 25wt% SiO2, the aluminum-oxygen ratio is 1.3, and the balance is water; and particles with a particle size of 80-100 mesh account for more than 80% of the leached slag.

[0070] The activator: cement: additive: leached residue are mixed in a mass ratio of 100:65:65:175 to obtain a mixture, which is poured into a mold and placed at 15-35° C. for 10 days to solidify.

[0071] Example 3

[0072] A method for treating precipitation mother liquor and uranium ore leaching residue, comprising:

[0073] S1, exchanging the precipitation mother liquor through a calcium type cationic saturated resin to obtain a calcium-rich mother liquor;

[0074] The NaOH content in the precipitation mother solution is 16.3wt% and the uranium concentration is 2.8mg / L;

[0075] S2, adding calcium oxide to the calcium-rich mother liquor to obtain an intermediate solution;

[0076] Add CaO to the calcium-rich mother liquor, mix and stir for 0.5h, and adjust the OH - Concentration up to 1.8 mol / L;

[0077] S3, adding potassium carbonate to the intermediate solution, stirring and mixing, letting stand, filtering, and obtaining an activator;

[0078] The amount of potassium carbonate added is 0.6wt% of the intermediate solution, the purity of potassium carbonate is above 99%, and the mixture is mixed and stirred for 1h after addition;

[0079] S4, mixing cement, additives, leached residue and the activator, and solidifying and forming;

[0080] The cement is silicate cement; the additive contains 14wt% Al3O2 and 22wt% SiO2, the aluminum-oxygen ratio is 1.2, and the balance is water; and particles with a particle size of 80-100 mesh account for more than 80% of the leached slag.

[0081] The activator: cement: additive: leached residue are mixed in a mass ratio of 100:62:60:180 to obtain a mixture, which is poured into a mold and placed at 15-35° C. for 20 days to solidify.

[0082] Example 4

[0083] A method for treating precipitation mother liquor and uranium ore leaching residue, comprising:

[0084] S1, exchanging the precipitation mother liquor through a calcium type cationic saturated resin to obtain a calcium-rich mother liquor;

[0085] The NaOH content in the precipitation mother solution is 18.4wt% and the uranium concentration is 4.7mg / L;

[0086] S2, adding calcium oxide to the calcium-rich mother liquor to obtain an intermediate solution;

[0087] Add CaO to the calcium-rich mother liquor, mix and stir for 0.5h, and adjust the OH - Concentration up to 1.7 mol / L;

[0088] S3, adding potassium carbonate to the intermediate solution, stirring and mixing, letting stand, filtering, and obtaining an activator;

[0089] The amount of potassium carbonate added is 0.4wt% of the intermediate solution, the purity of potassium carbonate is above 99%, and the mixture is mixed and stirred for 1h after addition;

[0090] S4, mixing cement, additives, leached residue and the activator, and solidifying and forming;

[0091] The cement is silicate cement; the additive contains 10wt% Al3O2 and 15wt% SiO2, the aluminum-oxygen ratio is 1.4, and the balance is water; and particles with a particle size of 80-100 mesh account for more than 80% of the leached slag.

[0092] The activator: cement: additive: leached residue are mixed in a mass ratio of 100:60:66:185 to obtain a mixture, which is poured into a mold and placed at 15-35° C. for 15 days to solidify.

[0093] Example 5

[0094] A method for treating precipitation mother liquor and uranium ore leaching residue, comprising:

[0095] S1, exchanging the precipitation mother liquor through a calcium type cationic saturated resin to obtain a calcium-rich mother liquor;

[0096] The NaOH content in the precipitation mother solution is 17.9wt% and the uranium concentration is 4.1mg / L;

[0097] S2, adding calcium oxide to the calcium-rich mother liquor to obtain an intermediate solution;

[0098] Add CaO to the calcium-rich mother liquor, mix and stir for 0.5h, and adjust the OH - Concentration up to 1.8 mol / L;

[0099] S3, adding potassium carbonate to the intermediate solution, stirring and mixing, letting stand, filtering, and obtaining an activator;

[0100] The amount of potassium carbonate added is 0.8wt% of the intermediate solution, the purity of potassium carbonate is above 99%, and the mixture is mixed and stirred for 1h after addition;

[0101] S4, mixing cement, additives, leached residue and the activator, and solidifying and forming;

[0102] The cement is silicate cement; the additive contains 13wt% Al3O2 and 18wt% SiO2, the aluminum-oxygen ratio is 1.2, and the balance is water; and particles with a particle size of 80-100 mesh account for more than 80% of the leached slag.

[0103] The activator: cement: additive: leached slag are mixed in a mass ratio of 100:58:70:182 to obtain a mixture, which is poured into a mold and placed at 15-35° C. for 15 days to solidify.

[0104] Comparative Example 1

[0105] A method for treating precipitation mother liquor and uranium ore leaching residue, comprising:

[0106] S1, exchanging the precipitation mother liquor through a calcium type cationic saturated resin to obtain a calcium-rich mother liquor;

[0107] The NaOH content in the precipitation mother solution is 18.1wt% and the uranium concentration is 3.5mg / L;

[0108] S2, adding calcium oxide to the calcium-rich mother liquor to obtain an intermediate solution;

[0109] CaO was added to the calcium-rich mother liquor, and the mixture was stirred for 0.5 h, and the OH- concentration was adjusted to 1.7 mol / L to obtain an activator;

[0110] S3, mixing cement, additives, leached residue and the activator, and solidifying and forming;

[0111] The cement is silicate cement; the additive contains 20wt% Al3O2 and 25wt% SiO2, the aluminum-oxygen ratio is 1.3, and the balance is water; and particles with a particle size of 80-100 mesh account for more than 80% of the leached slag.

[0112] The activator: cement: additive: leached residue are mixed in a mass ratio of 100:65:65:175 to obtain a mixture, which is poured into a mold and placed at 15-35° C. for 10 days to solidify.

[0113] Comparative Example 2

[0114] A method for treating precipitation mother liquor and uranium ore leaching residue, comprising:

[0115] S1, exchanging the precipitation mother liquor through a calcium type cationic saturated resin to obtain a calcium-rich mother liquor;

[0116] The NaOH content in the precipitation mother solution is 16wt% and the uranium concentration is 2.7mg / L;

[0117] S2, adding calcium oxide to the calcium-rich mother liquor to obtain an intermediate solution;

[0118] Add CaO to the calcium-rich mother liquor, mix and stir for 0.5h, and adjust the OH - Concentration up to 1.6 mol / L;

[0119] S3, adding potassium carbonate to the intermediate solution, stirring and mixing, letting stand, filtering, and obtaining an activator;

[0120] The amount of potassium carbonate added is 0.5wt% of the intermediate solution, the purity of potassium carbonate is above 99%, and the mixture is mixed and stirred for 1h after addition;

[0121] S4, mixing cement, additives, leached residue and the activator, and solidifying and forming;

[0122] The cement is silicate cement; the additive contains 5wt% Al3O2 and 10wt% SiO2, the aluminum-oxygen ratio is 1.2, and the balance is water; and particles with a particle size of 80-100 mesh account for more than 80% of the leached slag.

[0123] The activator: cement: additive: leached slag are mixed in a mass ratio of 100:60:68:180 to obtain a mixture, which is poured into a mold and placed at 15-35° C. for 15 days to solidify.

[0124] The solidified samples obtained in Examples 1-5 and Comparative Examples 1-3 were tested as follows:

[0125] Compressive strength test: The compressive strength of the solidified body was tested in accordance with GB / T 17671-1999;

[0126] Surface radon exhalation rate detection: Measure the radon exhalation rate of the solidified body surface according to EJT 979-1995;

[0127] Toxicity leaching test: Soak the solidified body in water for 7 days and measure the uranium concentration in the leaching solution.

[0128] The test results are shown in Table 1:

[0129] Table 1

[0130]

[0131]

[0132] It can be seen from the test results in Table 1 that when Comparative Example 1 does not use potassium carbonate to modify the precipitation mother liquor, the compressive strength of the solidified body will decrease; when Comparative Example 2 reduces the content of Al3O2 and SiO2 components in the additive, the strength of the solidified body decreases, and the fixation effect on toxic and harmful substances becomes worse, and the release rate of radionuclides increases. The untreated leaching residue was tested, and its surface radon precipitation rate was 0.0635Bg / (m 2 .s), compared with the untreated leaching residue, the radon release rate on the surface of the solidified body treated by the present application can be reduced by up to 48%.

[0133] Through the above method, the present invention realizes the reuse of precipitation mother liquor waste, reduces the amount of wastewater treatment, and reduces the complexity of the treatment process. At the same time, the solidification and reuse of uranium ore leaching residue is realized, and the solidified body can be used to prepare high-strength building materials for mines, paving stone slabs, etc.

[0134] Based on the same inventive concept, the present application also provides a building material, which is produced by the above-mentioned method for treating a precipitation mother liquor and uranium ore leaching slag. The building material can be used for paving hardened mine roads, building radioactive product or waste storage facilities, etc., and its surface radioactivity index is less than the background value.

[0135] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for treating precipitation mother liquor and uranium ore leaching residue, characterized in that ,include: The precipitation mother liquor is exchanged through a calcium-type cationic saturated resin to obtain a calcium-rich mother liquor; adding calcium oxide to the calcium-rich mother liquor to obtain an intermediate solution; Adding potassium carbonate to the intermediate solution, stirring and mixing, allowing to stand, and filtering to obtain an activator; The cement, additives, leached residue and the activator are mixed and solidified into a shape.

2. The method for treating a precipitation mother solution and uranium ore leaching residue according to claim 1, characterized in that , the additives include Al3O2 and SiO2.

3. The method for treating a precipitation mother solution and uranium ore leaching residue according to claim 2, characterized in that , Al3O2≥10wt%, SiO2≥15wt% in the additive, and the aluminum-oxygen ratio in the additive is 1.2-1.

4.

4. The method for treating a precipitation mother solution and uranium ore leaching residue according to claim 1, characterized in that , the mass ratio of the activator, cement, additive and leached residue is 100:(58-65):(65-70):(175-185).

5. The method for treating a precipitation mother solution and uranium ore leaching residue according to claim 1, characterized in that The amount of potassium carbonate added is 0.3-0.8wt% of the intermediate solution, and the purity of potassium carbonate is above 99%.

6. The method for treating a precipitation mother solution and uranium ore leaching residue according to claim 1, characterized in that , the NaOH in the precipitation mother liquor is ≤20wt%, and the uranium is ≤5mg / L.

7. The method for treating a precipitation mother solution and uranium ore leaching residue according to claim 1, characterized in that , the particle size of the leached residue is 0.15mm-10mm.

8. The method for treating a precipitation mother solution and uranium ore leaching residue according to claim 1, characterized in that , the step of adding calcium oxide to the calcium-rich mother liquor to obtain an intermediate solution comprises: Add calcium oxide to the calcium-rich mother liquor to adjust the OH content of the calcium-rich mother liquor. - The concentration reaches 1.6-1.8mol / L.

9. The method for treating a precipitation mother solution and uranium ore leaching residue according to claim 1, characterized in that The step of mixing cement, additives, leached residue and the activator and solidifying them into a shape comprises: Mixing cement, additives, leached residue and the activator to obtain a mixture; The mixture is poured into a mold and placed at room temperature for 7-20 days to solidify and form.

10. A building material, characterized in that: The leaching slag is prepared by the method for treating a precipitation mother solution and uranium ore leaching residue as described in any one of claims 1 to 9.

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