A novel smelting method for beryllium ore

Abstract

This invention relates to the field of inorganic materials technology, and more particularly to a novel smelting method for beryllium ore, comprising: adding aluminum-containing materials, silicon-containing materials, and / or calcium-containing materials to adjust the silicon, aluminum, and calcium element ratio in the beryllium ore; adding carbonate or bicarbonate materials to the beryllium ore after adjusting the silicon, aluminum, and calcium element ratio, and leaching under alkaline conditions using water as the leaching medium to obtain a beryllium-rich leachate. By adjusting the silicon and aluminum element ratio in the beryllium ore, after roasting, during the leaching reaction stage, calcium, aluminum, and silicon combine to form hydrated garnet precipitate, allowing silicon in the ore to enter the slag, effectively achieving the separation of beryllium from the impurity element silicon. This solves the problems of low beryllium yield, low beryllium product purity, high pollution, and difficult wastewater treatment in existing beryllium smelting and preparation techniques.

Description

Technical Field

[0001] This invention relates to the field of beryllium industry technology, and in particular to a novel smelting method for beryllium ore. Background Technology

[0002] Beryllium is an indispensable material in the atomic energy, rocket, missile, aviation, and metallurgical industries, but it also poses a significant environmental hazard. Although my country possesses large beryllium reserves, they are mostly found as associated minerals, resulting in poor-quality beryllium concentrate, low production, and a strong reliance on imports. Given this unfavorable situation of excessive dependence on foreign beryllium resources and the urgent need to address the bottleneck of self-sufficiency in beryllium supply, the development and utilization of complex beryllium associated mineral resources has become an inevitable choice for the sustainable development of my country's beryllium industry.

[0003] Current technologies primarily employ acid leaching to dissociate beryllium ore, mainly the sulfuric acid process and the fluorination process. However, existing processes for extracting beryllium from beryllium ore have the following drawbacks: Firstly, acid leaching introduces associated beryllium ions (such as ferric iron) into the leachate, which often affects the separation efficiency and causes beryllium loss. This reduced beryllium recovery rate leads to some beryllium entering the environment, causing pollution. Secondly, the extraction process requires the addition of soluble alkaline substances (sodium hydroxide or ammonia) to adjust the acidity of the solution, resulting in the introduction of soluble alkaline cations into the leachate, significantly increasing the difficulty of subsequent wastewater treatment. Therefore, there is an urgent need in the market for a highly efficient and environmentally friendly clean smelting method for beryllium oxide. Summary of the Invention

[0004] In view of the above analysis, the present invention aims to provide a novel smelting method for beryllium ore, which solves at least one of the problems existing in the prior art of beryllium smelting and preparation, such as low beryllium element yield, low beryllium product purity, high pollution, and difficulty in waste liquid treatment.

[0005] The objective of this invention is mainly achieved through the following technical solutions:

[0006] A novel smelting method for beryllium ore, the clean smelting method comprising:

[0007] Add aluminum-containing materials, silicon-containing materials and / or calcium-containing materials to adjust the silicon, aluminum and calcium element ratio in beryllium ore;

[0008] Beryllium ore with adjusted silicon, aluminum, and calcium ratios is added to carbonate or bicarbonate materials, and then heated and leached under alkaline conditions using water as the leaching medium to obtain a beryllium-rich leachate.

[0009] Preferably, the clean smelting method includes:

[0010] Step 1: Beryllium ore is refined to obtain beryllium ore powder within the target particle size range;

[0011] Step 2: According to the silicon and aluminum content in beryllium ore, add aluminum-containing materials, silicon-containing materials and / or calcium-containing materials, as well as carbonate or bicarbonate materials for roasting reaction;

[0012] Step 3: After roasting, the material is leached with an alkaline aqueous solution, and the leachate is filtered to obtain a beryllium- and aluminum-rich leachate.

[0013] Step 4: After dilution and boiling of the beryllium-rich aluminum leaching solution, beryllium hydroxide precipitate is obtained, thus achieving the separation of beryllium and aluminum.

[0014] Preferably, in step 2, the molar amount of aluminum in the beryllium ore for which the silicon, aluminum, and calcium element ratio is adjusted is 1 to 1.5 times that of silicon, and the molar amount of calcium is 1.5 to 2 times that of aluminum.

[0015] Preferably, in step 2, the amount of carbonate material or bicarbonate used is 1 to 2 times the mass of beryllium ore.

[0016] Preferably, the carbonate or bicarbonate material in step 2 can be sodium bicarbonate or sodium carbonate.

[0017] Preferably, the roasting temperature in step 2 is 800℃~1300℃.

[0018] Preferably, the calcium-containing material in step 2 is one or more of calcium oxide, calcium carbonate, calcium chloride, and limestone.

[0019] Preferably, the alkali concentration in the aqueous solution of alkali in step 3 is 100 g / L to 250 g / L.

[0020] Preferably, the dilution in step 4 should meet the following requirement: the mass concentration of alkali in the diluted beryllium-rich aluminum leaching solution is <40g / L.

[0021] A beryllium oxide, prepared by the novel smelting method of the aforementioned beryllium ore, with a beryllium oxide purity of [missing information].

[0022] ≥95%.

[0023] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0024] (1) By adjusting the ratio of silicon and aluminum in beryllium ore, after roasting, calcium, aluminum and silicon will combine to form hydrated garnet precipitate during the leaching reaction stage, which can allow silicon in the ore to enter the slag, effectively achieving the separation of beryllium from the impurity element silicon.

[0025] (2) This invention adjusts the silicon, aluminum, and calcium element ratio in beryllium ore, and after roasting, leaches the beryllium ore under alkaline conditions, retaining silicon, iron, calcium, and magnesium in the leaching residue. This achieves the separation of impurity elements from beryllium, resulting in a beryllium-rich leachate. On the one hand, this operation retains silicon in the leaching residue, preventing silicon from entering the leachate in the form of silicates under alkaline conditions. On the other hand, compared to the existing acid leaching process for beryllium, it avoids introducing associated element ions (such as ferric iron) of beryllium in the beryllium ore into the leachate, reducing beryllium loss and pollution caused by beryllium flowing into the environment. Simultaneously, it avoids the introduction of soluble alkaline cations during the extraction process, reducing the difficulty of subsequent wastewater treatment.

[0026] (3) This invention reduces the alkalinity of the leachate by diluting the beryllium-rich leachate and obtains beryllium hydroxide precipitate and aluminum solution by heating or even boiling. This achieves the separation of aluminum and beryllium without adding pH adjustment reagents or introducing new anion and cation impurities. Compared with traditional methods, the separation process can effectively reduce reagent consumption and the amount of aluminum-containing waste liquid to be treated, thereby reducing costs and environmental hazards.

[0027] (4) This invention does not use the traditional extraction method for beryllium. No extract phase or impurity cations are introduced into the solution. The aluminum-rich leachate obtained after filtration can be directly reused as an aluminum-containing raw material. At the same time, the alkali in the aluminum-rich leachate is recycled, reducing waste liquid recycling and lowering the cost of discharge treatment.

[0028] Other features and advantages of the invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained from the embodiments described and the accompanying drawings. Attached Figure Description

[0029] Figure 1 : A process flow diagram of a novel smelting method for beryllium ore according to the present invention. Detailed Implementation

[0030] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0031] This invention discloses a novel smelting method for beryllium ore, comprising:

[0032] Add aluminum-containing materials, silicon-containing materials and / or calcium-containing materials to adjust the silicon, aluminum and calcium element ratio in beryllium ore;

[0033] Beryllium ore with adjusted silicon, aluminum, and calcium ratios is added to carbonate or bicarbonate materials, and then heated and leached under alkaline conditions using water as the leaching medium to obtain a beryllium-rich leachate.

[0034] During implementation, aluminum-containing materials, silicon-containing materials, and / or calcium-containing materials are introduced according to the silicon and aluminum content in the beryllium ore to adjust the silicon, aluminum, and calcium element ratio in the beryllium ore. This allows the silicon in the ore to combine with calcium and aluminum to form hydrated garnet precipitate, which allows the silicon in the ore to enter the slag. This effectively separates beryllium from the impurity element silicon and allows it to enter the slag. After filtration, the separation of beryllium from the impurity element silicon can be effectively achieved.

[0035] It should be noted that iron oxides, calcium oxides, and magnesium oxides in the ore are difficult to dissolve in the reaction and will also enter the slag. After filtration, beryllium can be effectively separated from the impurity elements iron, calcium, and magnesium. Beryllium and some aluminum enter the leachate, effectively solving the problem of the introduction of associated elements.

[0036] Compared with the prior art, the present invention adjusts the silicon and aluminum ratio in beryllium ore. After roasting, during the leaching reaction stage, calcium, aluminum and silicon combine to form hydrated garnet precipitate, which allows silicon in the ore to enter the slag, effectively achieving the separation of beryllium from the impurity element silicon.

[0037] It should be noted that during the leaching reaction stage, iron oxides, calcium oxides, and magnesium oxides in the ore are difficult to dissolve by the reaction and will also enter the slag. After filtration, beryllium can be effectively separated from the impurity elements iron, calcium, and magnesium, and beryllium and some aluminum can enter the leaching solution, effectively solving the problem of the introduction of associated elements. This method is particularly suitable for low-grade beryllium ores with high silicon content.

[0038] Compared with existing technologies, this invention achieves the separation of impurity elements from beryllium by adjusting the silicon, aluminum, and calcium element ratio in beryllium ore, followed by roasting and leaching under alkaline conditions. This retains silicon, iron, calcium, and magnesium in the leaching residue, resulting in a beryllium-rich leachate. This process, on the one hand, retains silicon in the leaching residue, preventing silicon from entering the leachate as silicates under alkaline conditions; on the other hand, compared to existing acid leaching processes, it avoids introducing associated beryllium ions (such as ferric iron) into the leachate, reducing beryllium loss and pollution from beryllium entering the environment; and simultaneously avoids the introduction of soluble alkaline cations during extraction, reducing the difficulty of subsequent wastewater treatment.

[0039] Preferably, the clean smelting method further includes: separating beryllium and aluminum elements in beryllium-rich leachate by utilizing the difference in solubility of beryllium and aluminum in solutions with different pH values.

[0040] Specifically, the separation of beryllium and aluminum elements in beryllium-rich leachate by utilizing the difference in solubility of beryllium and aluminum in solutions with different pH values ​​includes: reducing the alkalinity of beryllium-rich leachate by diluting it; and obtaining beryllium hydroxide precipitate by heating the low-alkalinity beryllium-rich leachate.

[0041] During implementation, based on the differences in precipitation ranges of beryllium and aluminum and their solubility at different pH levels, the alkalinity of the leachate is reduced by dilution; while heating or even boiling can cause beryllium to form beryllium hydroxide precipitate, while aluminum remains in the solution in ionic form, thereby achieving the separation of aluminum and beryllium elements.

[0042] Compared with existing technologies, this invention reduces the alkalinity of the beryllium-rich leachate by diluting it and obtains beryllium hydroxide precipitate and aluminum solution by heating or even boiling. This achieves the separation of aluminum and beryllium without adding pH adjustment reagents or introducing new anionic and cation impurities. Compared with traditional methods, the separation process can effectively reduce reagent consumption and the amount of aluminum-containing waste liquid to be treated, thereby reducing costs and environmental hazards.

[0043] Preferably, the clean smelting method includes:

[0044] Step 1: Beryllium ore is refined to obtain beryllium ore powder within the target particle size range;

[0045] Step 2: According to the silicon and aluminum content in beryllium ore, add aluminum-containing materials, silicon-containing materials and / or calcium-containing materials, as well as carbonate or bicarbonate materials for roasting reaction;

[0046] Step 3: After roasting, the material is leached with an alkaline aqueous solution, and the leachate is filtered to obtain a beryllium- and aluminum-rich leachate.

[0047] Step 4: After dilution and boiling of the beryllium-rich aluminum leaching solution, beryllium hydroxide precipitate is obtained, thus achieving the separation of beryllium and aluminum.

[0048] Preferably, the particle size of the mineral powder in step 1 is above 30 mesh, preferably 100 to 200 mesh, and can be 100 mesh, 110 mesh, 120 mesh, 130 mesh, 140 mesh, 150 mesh, 160 mesh, 170 mesh, 180 mesh, 190 mesh or 200 mesh.

[0049] It should be noted that smaller mineral powder particle size is beneficial to improving the subsequent reaction rate and reaction degree, which helps to increase the beryllium yield; however, excessively small mineral powder particle size increases the cost of refining, and the beryllium yield will not be further improved.

[0050] Preferably, in step 2, the molar amount of aluminum in the beryllium ore for which the silicon, aluminum, and calcium element ratio is adjusted is 1 to 1.5 times that of silicon, and the molar amount of calcium is 1.5 to 2 times that of aluminum.

[0051] It should be noted that at this aluminum-silicon-calcium molar ratio, silicon in beryllium ore can form an alkali-insoluble precipitate co-salt with aluminum and calcium, reducing the aluminum content in the leachate, as detailed below:

[0052] 3Ca(OH)2+2NaAl(OH)4+xNa2SiO3+aq=3CaO·Al2O3·xSiO2·yH2O+2(1+x)Na(OH)+aq;

[0053] aq represents an aqueous solution.

[0054] Preferably, in step 2, the amount of carbonate material or bicarbonate used is 1 to 2 times the mass of beryllium ore.

[0055] It should be noted that at this dosage, carbonate materials or bicarbonates can ensure almost complete reaction with the elements in the ore, thus guaranteeing the dissociation effect of roasting on the ore.

[0056] Preferably, the carbonate or bicarbonate material in step 2 can be sodium bicarbonate or sodium carbonate.

[0057] Preferably, the roasting temperature in step 2 is 800℃~1300℃, for example, it can be 800℃, 820℃, 870℃, 880℃, 890℃, 900℃, 910℃, 920℃, 930℃, 940℃, 950℃, 960℃, 970℃, 980℃, 990℃, 1000℃, 1010℃, 1020℃, 1040℃, 1050℃, 1080℃, 1100℃, 1120℃, 1140℃, 1150℃, 1170℃, 1180℃, 1190℃, 1200℃, 1210℃, 1230℃, 1250℃, 1260℃, 1280℃, or 1300℃.

[0058] It should be noted that at this temperature, beryllium ore and sodium bicarbonate can be brought to a molten state, allowing the metallic elements in the beryllium ore to be completely oxidized by the reaction.

[0059] Preferably, in step 2, the aluminum-containing material is aluminum oxide or aluminum salt, and the silicon-containing material is silicon dioxide or silicate.

[0060] Preferably, the aluminum-containing material in step 2 is one or more of aluminum oxide monohydrate, aluminum oxide trihydrate, aluminum hydroxide, aluminum sulfate, and aluminum chloride.

[0061] Preferably, the calcium-containing material in step 2 is one or more of calcium oxide, calcium carbonate, calcium chloride, and limestone.

[0062] Specifically, in step 3, the volume ratio of the alkali aqueous solution to the beryllium ore liquid solids during leaching satisfies 4:1 to 10:1.

[0063] It should be noted that at this liquid-to-solid ratio, the leaching reaction can be carried out without excessive reagent consumption.

[0064] Preferably, the alkali concentration in the aqueous solution of alkali in step 3 is 100 g / L to 250 g / L.

[0065] It should be noted that this alkali concentration not only ensures the effective leaching of beryllium, but also allows beryllium to enter the solution in ionic form. Excessive alkali will cause unnecessary waste.

[0066] Preferably, the alkali used for leaching in step 3 is one or more of sodium hydroxide and potassium hydroxide.

[0067] Preferably, the leaching in step 3 is carried out under normal pressure, and the heating temperature is between 90°C and 95°C, for example, 90°C, 91°C, 92°C, 93°C, 94°C or 95°C.

[0068] It should be noted that the leaching process should be heated to 90℃~95℃: this temperature can accelerate the reaction rate, which is beneficial for the alkaline solution to destroy the structure of beryllium ore and achieve the dissociation of beryllium and aluminum in the beryllium ore; at the same time, this temperature range can reduce the amount of alkali used.

[0069] In step 4, the dilution should meet the following requirement: the mass concentration of alkali in the diluted beryllium-rich aluminum leaching solution should be <40 g / L.

[0070] It should be noted that this invention achieves the separation of beryllium and aluminum by directly diluting and boiling the leachate, without introducing acidic reagents to adjust the pH of the solution. Based on the precipitation ranges of beryllium and aluminum and the differences in solubility at different pH levels, the alkalinity of the leachate is reduced by dilution. Under boiling conditions, beryllium forms beryllium hydroxide precipitate, while aluminum remains in the solution in ionic form. Compared with traditional methods, this separation process effectively reduces reagent consumption.

[0071] Specifically, when the alkali concentration is between 100g / L and 250g / L, dilute it by 2 to 6 times.

[0072] It should be further noted that heating widens the pH range for beryllium precipitation, and aluminum remains in ionic form within this pH range.

[0073] Preferably, the clean smelting method further includes:

[0074] Step 5: Filter to separate the beryllium hydroxide precipitate and the aluminum-rich leachate. The aluminum-rich leachate is then concentrated by evaporation and reused as an aluminum-containing material.

[0075] It should be noted that the aluminum-rich leachate also contains a certain amount of aluminum and a high concentration of alkali. After evaporation and concentration, the solution can be returned to the pressure cooking section for reuse, reducing wastewater discharge.

[0076] Preferably, the alkali concentration in the aluminum-rich leachate is concentrated to 180 g / L to 280 g / L.

[0077] It should be noted that concentrating the alkali to this concentration meets the alkali concentration required for pressure leaching, making it easy to recycle and reuse.

[0078] Compared with the prior art, the present invention does not use the traditional extraction method for beryllium, and no extract phase or impurity cations are introduced into the solution. The aluminum-rich leachate obtained after filtration can be directly reused as an aluminum-containing raw material. At the same time, the alkali in the aluminum-rich leachate is recovered and reused, reducing waste liquid recycling and lowering the cost of discharge treatment.

[0079] Preferably, the clean smelting method further includes:

[0080] Step 6: After drying and calcining beryllium hydroxide, beryllium oxide is obtained.

[0081] On the other hand, the present invention also discloses a beryllium oxide prepared by the above-mentioned novel smelting method of beryllium ore, wherein the beryllium oxide has a purity of ≥95%.

[0082] To further illustrate the present invention, the following embodiments and comparative examples are provided:

[0083] Example 1a

[0084] This embodiment discloses a novel smelting method for beryllium ore, such as... Figure 1 As shown, it includes:

[0085] Step 1: Chrysoberyl (silicon: 20.1%, aluminum: 11.4%, calcium: 15.2%) is crushed and ground to obtain beryllium ore powder; the powder particle size is above 100 mesh;

[0086] Step 2: Based on the content of silicon, aluminum, and calcium in the beryllium ore, add appropriate amounts of aluminum-containing material alumina, calcium-containing material calcium oxide, and silicon-containing material silicon dioxide, and then add sodium carbonate or sodium bicarbonate together for roasting reaction; the roasting temperature in Step 2 is 1000℃, and the molar amount of aluminum in the beryllium ore powder after adjusting the silicon, aluminum, and calcium element ratio in Step 2 is twice the molar amount of silicon, the molar amount of calcium is 1.5 times the molar amount of aluminum, and the amount of sodium carbonate or sodium bicarbonate is twice the mass of the ore powder.

[0087] Step 3: After roasting, the material is leached with a dilute sodium hydroxide solution; the sodium hydroxide concentration is 200 g / L; after the leaching reaction is completed, the material is filtered to obtain a leachate containing beryllium and aluminum, while elements such as silicon, iron, calcium, and magnesium enter the slag.

[0088] Step 4: The leachate containing beryllium and aluminum is diluted 5 times and boiled to obtain beryllium hydroxide precipitate, thus achieving the separation of beryllium and aluminum;

[0089] Step 5: The filtered aluminum-containing solution is concentrated by evaporation and reused as an aluminum-containing material;

[0090] Step 6: After drying and calcining, beryllium hydroxide is used to obtain beryllium oxide.

[0091] The purity of beryllium oxide was determined to be 96% using existing methods; the beryllium element yield from the beryllium ore was 95%.

[0092] Example 1b

[0093] This embodiment discloses a novel smelting method for beryllium ore, such as... Figure 1 As shown, it includes:

[0094] Step 1: Chrysoberyl (silicon: 9.1%, aluminum: 21.4%, calcium: 5.2%) is crushed and ground to obtain beryllium ore powder; the powder particle size is above 100 mesh;

[0095] Step 2: Based on the content of silicon, aluminum, and calcium in the beryllium ore, add appropriate amounts of aluminum-containing material alumina, calcium-containing material calcium oxide, and silicon-containing material silicon dioxide, and then add sodium carbonate or sodium bicarbonate together for roasting reaction; the roasting temperature in Step 2 is 1000℃, and the molar amount of aluminum in the beryllium ore powder after adjusting the silicon, aluminum, and calcium element ratio in Step 2 is twice the molar amount of silicon, the molar amount of calcium is 1.5 times the molar amount of aluminum, and the amount of sodium carbonate or sodium bicarbonate is twice the mass of the ore powder.

[0096] Step 3: After roasting, the material is leached with a dilute sodium hydroxide solution; the sodium hydroxide concentration is 200 g / L; after the leaching reaction is completed, the material is filtered to obtain a leachate containing beryllium and aluminum, while elements such as silicon, iron, calcium, and magnesium enter the slag.

[0097] Step 4: The leachate containing beryllium and aluminum is diluted 5 times and boiled to obtain beryllium hydroxide precipitate, thus achieving the separation of beryllium and aluminum;

[0098] Step 5: The filtered aluminum-containing solution is concentrated by evaporation and reused as an aluminum-containing material;

[0099] Step 6: After drying and calcining, beryllium hydroxide is used to obtain beryllium oxide.

[0100] The purity of beryllium oxide was determined to be 96.2% using existing methods; the beryllium element yield of the beryllium ore was 95.4%.

[0101] Example 2a

[0102] This embodiment discloses a novel smelting method for beryllium ore, such as... Figure 1 As shown, it includes:

[0103] Step 1: Hydroxysilicic beryllium ore (silicon: 20.6%, aluminum: 8.5%, calcium: 14.4%) is crushed and ground to obtain beryllium ore powder; the particle size of the ore powder is above 200 mesh;

[0104] Step 2: Based on the silicon, aluminum, and calcium content in the beryllium ore, add appropriate amounts of aluminum-containing material aluminum chloride, calcium-containing material calcium carbonate, and silicon-containing material sodium silicate. Then, add sodium carbonate or sodium bicarbonate and roast together. The roasting temperature in Step 2 is 1300℃. In Step 2, the molar amount of aluminum in the beryllium ore powder after adjusting the silicon, aluminum, and calcium element ratio is 1.5 times the molar amount of silicon, the molar amount of calcium is 2 times the molar amount of aluminum, and the amount of sodium carbonate or sodium bicarbonate is 1.5 times the mass of the ore powder.

[0105] Step 3: After roasting, the material is leached with a dilute sodium hydroxide solution; the sodium hydroxide concentration is 150 g / L; after the leaching reaction is completed, the material is filtered to obtain a leachate containing beryllium and aluminum, while elements such as silicon, iron, calcium, and magnesium enter the slag.

[0106] Step 4: The leachate containing beryllium and aluminum is diluted 4 times and boiled to obtain beryllium hydroxide precipitate, thus achieving the separation of beryllium and aluminum;

[0107] Step 5: The filtered aluminum-containing solution is concentrated by evaporation and reused as an aluminum-containing material;

[0108] Step 7: After drying and calcining, beryllium hydroxide is used to obtain beryllium oxide.

[0109] The purity of beryllium oxide was determined to be 96.8% using existing methods; the beryllium element yield of the beryllium ore was 96.3%.

[0110] Example 2b

[0111] This embodiment discloses a novel smelting method for beryllium ore, such as... Figure 1 As shown, it includes:

[0112] Step 1: Hydroxysilicic beryllium ore (silicon: 12.6%, aluminum: 28.5%, calcium: 8.4%) is crushed and ground to obtain beryllium ore powder; the particle size of the ore powder is above 200 mesh;

[0113] Step 2: Based on the silicon, aluminum, and calcium content in the beryllium ore, add appropriate amounts of aluminum-containing material aluminum chloride, calcium-containing material calcium carbonate, and silicon-containing material sodium silicate. Then, add sodium carbonate or sodium bicarbonate and roast together. The roasting temperature in Step 2 is 1300℃. In Step 2, the molar amount of aluminum in the beryllium ore powder after adjusting the silicon, aluminum, and calcium ratio is 1.5 times the molar amount of silicon, the molar amount of calcium is 2 times the molar amount of aluminum, and the amount of sodium carbonate or sodium bicarbonate is 1.5 times the mass of the ore powder.

[0114] Step 3: After roasting, the material is leached with a dilute sodium hydroxide solution; the sodium hydroxide concentration is 150 g / L; after the leaching reaction is completed, the material is filtered to obtain a leachate containing beryllium and aluminum, while elements such as silicon, iron, calcium, and magnesium enter the slag.

[0115] Step 4: The leachate containing beryllium and aluminum is diluted 4 times and boiled to obtain beryllium hydroxide precipitate, thus achieving the separation of beryllium and aluminum;

[0116] Step 5: The filtered aluminum-containing solution is concentrated by evaporation and reused as an aluminum-containing material;

[0117] Step 7: After drying and calcining, beryllium hydroxide is used to obtain beryllium oxide.

[0118] The purity of beryllium oxide was determined to be 96.4% using existing methods; the beryllium element yield of the beryllium ore was 96.2%.

[0119] Example 3a

[0120] This embodiment discloses a novel smelting method for beryllium ore, such as... Figure 1 As shown, it includes:

[0121] Step 1: Beryl (aluminum: 10.6%, silicon: 26.5%, calcium: 10.4%) is crushed and ground to obtain beryllium ore powder; the particle size of the ore powder is above 300 mesh;

[0122] Step 2: Based on the silicon, aluminum, and calcium content in the beryllium ore, add appropriate amounts of aluminum-containing alumina, calcium-containing limestone, and silicon-containing silicon dioxide, and then add sodium carbonate or sodium bicarbonate together for roasting reaction; the roasting temperature in Step 2 is 900℃; in the beryllium ore powder after adjusting the silicon, aluminum, and calcium element ratio in Step 2, the molar amount of aluminum is 1.5 times the molar amount of silicon, the molar amount of calcium is 1.5 times the molar amount of aluminum, and the amount of sodium carbonate or sodium bicarbonate is 1 times the mass of the ore powder.

[0123] Step 3: After roasting, the material is leached with a dilute sodium hydroxide solution; the sodium hydroxide concentration is 250 g / L; after the leaching reaction is completed, the material is filtered to obtain a leachate containing beryllium and aluminum, while elements such as silicon, iron, calcium, and magnesium enter the slag.

[0124] Step 4: The leachate containing beryllium and aluminum is diluted 6 times and boiled to obtain beryllium hydroxide precipitate, thus achieving the separation of beryllium and aluminum;

[0125] Step 5: The filtered aluminum-containing solution is concentrated by evaporation and reused as an aluminum-containing material;

[0126] Step 6: After drying and calcining, beryllium hydroxide is used to obtain beryllium oxide.

[0127] The purity of beryllium oxide was determined to be 95.4% using existing methods; the beryllium element yield of the beryllium ore was 94.9%.

[0128] Example 3b

[0129] This embodiment discloses a novel smelting method for beryllium ore, such as... Figure 1 As shown, it includes:

[0130] Step 1: Beryl (aluminum: 20.6%, silicon: 7.5%, calcium: 6.4%) is crushed and ground to obtain beryllium ore powder; the particle size of the ore powder is above 300 mesh;

[0131] Step 2: Based on the silicon, aluminum, and calcium content in the beryllium ore, add appropriate amounts of aluminum-containing alumina, calcium-containing limestone, and silicon-containing silicon dioxide, and then add sodium carbonate or sodium bicarbonate together for roasting reaction; the roasting temperature in Step 2 is 900℃; in the beryllium ore powder after adjusting the silicon, aluminum, and calcium element ratio in Step 2, the molar amount of aluminum is 1.5 times the molar amount of silicon, the molar amount of calcium is 1.5 times the molar amount of aluminum, and the amount of sodium carbonate or sodium bicarbonate is 1 times the mass of the ore powder.

[0132] Step 3: After roasting, the material is leached with a dilute sodium hydroxide solution; the sodium hydroxide concentration is 250 g / L; after the leaching reaction is completed, the material is filtered to obtain a leachate containing beryllium and aluminum, while elements such as silicon, iron, calcium, and magnesium enter the slag.

[0133] Step 4: The leachate containing beryllium and aluminum is diluted 6 times and boiled to obtain beryllium hydroxide precipitate, thus achieving the separation of beryllium and aluminum;

[0134] Step 5: The filtered aluminum-containing solution is concentrated by evaporation and reused as an aluminum-containing material;

[0135] Step 6: After drying and calcining, beryllium hydroxide is used to obtain beryllium oxide.

[0136] The purity of beryllium oxide was determined to be 95.3% using existing methods; the beryllium element yield of the beryllium ore was 94.8%.

[0137] Example 4

[0138] This embodiment discloses a novel smelting method for beryllium ore, which differs from Embodiment 1 in that: the ore powder particle size is 40 mesh; the beryllium oxide purity is tested to be 95.7%; and the beryllium element yield of the beryllium ore powder is 92.5%.

[0139] Comparative Example 1

[0140] This comparative example discloses a novel smelting method for beryllium ore, which differs from Example 1 in that: the ore powder particle size is 20 mesh, which does not meet the ore powder particle size range specified in this invention; the beryllium oxide purity is tested to be 95.3%; and the beryllium element yield of the beryllium ore is 87.6%.

[0141] Comparative Example 2

[0142] This comparative example discloses a novel smelting method for beryllium ore, which differs from Example 1 in that: the roasting temperature in step 2 is 600℃, which does not meet the roasting temperature range specified in this invention; the beryllium oxide purity is tested to be 94.2%; and the beryllium element yield of the beryllium ore is 75.2%.

[0143] Comparative Example 4

[0144] This comparative example discloses a novel smelting method for beryllium ore, which differs from Example 1 in that: in step 3, the molar amount of aluminum is 0.5 times the molar amount of silicon, which does not meet the range of aluminum-silicon molar ratio specified in this invention; the purity of beryllium oxide is tested to be 85%; and the beryllium element yield of beryllium ore is 90%.

[0145] Comparative Example 5

[0146] This comparative example discloses a novel smelting method for beryllium ore, which differs from Example 1 in that: in step 2, the molar amount of calcium is 0.5 times the molar amount of aluminum, which does not meet the range of calcium-aluminum molar ratio specified in this invention; the purity of beryllium oxide is tested to be 80%; and the beryllium element yield of beryllium ore is 90%.

[0147] Comparative Example 6

[0148] This comparative example discloses a novel smelting method for beryllium ore, which differs from Example 1 in that: the amount of sodium carbonate or sodium bicarbonate used is 0.5 times the mass of beryllium ore powder, which does not meet the above-mentioned limit; the purity of beryllium oxide was tested to be 92.1%; and the beryllium element yield of beryllium ore was 60%.

[0149] Comparative Example 7

[0150] This comparative example discloses a novel smelting method for beryllium ore, which differs from Example 1 in that: the dilution factor in step 4 is 1, which does not meet the above-mentioned limit; the beryllium element yield of the beryllium ore is 20%, the dilution factor is insufficient, the alkalinity is too high, and beryllium is difficult to precipitate.

[0151] As can be seen from the above, the beryllium oxide prepared in Examples 1a-4 of the present invention has a purity greater than 95%, preferably greater than 96%; the beryllium element yield of the beryllium ore is greater than 92%, preferably greater than 96%; the present invention can realize the liberation of various beryllium ores, whether it is easily smelted beryl, hydroxysilyl beryllite or low-grade chrysoberyl, etc., beryllium can be leached using this method.

[0152] As can be seen from the comparison of the examples and comparative examples, the following will have adverse effects on the purity of beryllium oxide and the yield of beryllium element in beryllium ore: the pressure leaching temperature exceeds 150℃~300℃, the roasting temperature in step 2 exceeds 800℃~1300℃, the molar amount of aluminum exceeding the molar amount of silicon by more than 1 to 1.5 times after adding aluminum-containing and / or calcium-containing materials to beryllium ore, the molar amount of calcium exceeding the molar amount of aluminum by more than 1.5 to 2 times after adding aluminum-containing and / or calcium-containing materials to beryllium ore, the amount of sodium carbonate or sodium bicarbonate exceeding 1 to 2 times the mass of beryllium ore, and the dilution ratio in step 3 exceeding the limit range of 2 to 6 times.

Claims

1. A novel smelting method for beryllium ore, characterized in that, The novel smelting method for beryllium ore includes: Add aluminum-containing materials, silicon-containing materials and / or calcium-containing materials to adjust the silicon, aluminum and calcium element ratio in beryllium ore; Beryllium ore with adjusted silicon, aluminum and calcium ratios is added to carbonate or bicarbonate materials, and under alkaline conditions, water is used as the leaching medium for heating and leaching to obtain a beryllium-rich leachate. The novel smelting method for beryllium ore includes: Step 1: Beryllium ore is refined to obtain beryllium ore powder within the target particle size range; Step 2: According to the silicon and aluminum content in beryllium ore, add aluminum-containing materials, silicon-containing materials and / or calcium-containing materials, as well as carbonate or bicarbonate materials for roasting reaction; Step 3: After roasting, the material is leached with an alkaline aqueous solution, and the leachate is filtered to obtain a beryllium- and aluminum-rich leachate. Step 4: After dilution and boiling, the beryllium-rich aluminum leaching solution yields beryllium hydroxide precipitate, thus separating beryllium from aluminum. In step 2, the molar amount of aluminum in the beryllium ore after adjusting the silicon, aluminum, and calcium ratio is 1 to 1.5 times that of silicon, and the molar amount of calcium is 1.5 to 2 times that of aluminum.

2. The novel smelting method for beryllium ore according to claim 1, characterized in that, In step 2, the amount of carbonate material or bicarbonate used is 1 to 2 times the mass of beryllium ore.

3. The novel smelting method for beryllium ore according to claim 2, characterized in that, In step 2, the carbonate or bicarbonate material is sodium bicarbonate or sodium carbonate.

4. The novel smelting method for beryllium ore according to claim 1, characterized in that, The roasting temperature in step 2 is 800℃~1300℃.

5. The novel smelting method for beryllium ore according to claim 1, characterized in that, The calcium-containing material in step 2 is one or more of calcium oxide, calcium carbonate, calcium chloride, and limestone.

6. The novel smelting method for beryllium ore according to claim 1, characterized in that, In step 3, the concentration of alkali in the aqueous solution is 100 g / L to 250 g / L.

7. The novel smelting method for beryllium ore according to any one of claims 1-6, characterized in that, In step 4, the dilution should meet the following requirement: the mass concentration of alkali in the diluted beryllium-rich aluminum leaching solution should be <40 g / L.

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