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Preparation of rare earth ammonium bimolybdate

A kind of ammonium dimolybdate, the technology of preparation process, applied in the direction of rare earth metal compound, molybdenum compound, inorganic chemistry, etc., can solve the problem such as can not reach the doping of molecular level, achieve particle crystal form integrity, material processing and use performance improvement, good The effect of processability

Inactive Publication Date: 2005-07-27
临沂市科创材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no matter what method is adopted, the effect of molecular level doping cannot be achieved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The preparation of nitrate solution: press the ratio of lanthanum oxide: nitric acid=1kg: 2.5L, place 742g lanthanum oxide in the beaker, add 1.5L mass percentage concentration and be the nitric acid of 65%, heating and stirring, heating temperature is 140 ℃, appropriate Stir manually until the solution is clear to produce lanthanum nitrate;

[0018] Preparation of mother liquor: first add soft water and ammonia and stir, then add ammonium tetramolybdate in batches, its ammonium tetramolybdate: soft water: ammonia = 1kg: 4L: 1L, heat and stir, the heating temperature is 110°C, and the stirring speed is 120r / min , forming a mother liquor. Adjust the pH value of the mother liquor to 7.4 by adding ammonia water, and the density is 1.26g / cm 3 between.

[0019] Slowly add lanthanum nitrate to the mother liquor, the total mass percentage does not exceed 2.5% of the total mass of ammonium dimolybdate, continue to stir and heat for 4.5 hours, pour out the material liquid, suc...

Embodiment 2

[0021] The ratio of 38g of cerium oxide to soft water is 1Kg: 2L to prepare a suspension, then hydrogen peroxide: suspension is added according to the volume ratio of 1: 4, and manually stirred to form a mixed solution; then, according to nitric acid: 1kg of cerium oxide : the ratio of 2.5L is added in the mixed solution, the nitric acid mass percentage concentration is 66%, stirs, and heating temperature is 260 ℃, can make cerium nitrate until solution clarification;

[0022] Add 40L of soft water and 10L of ammonia water into the crystallization tank according to the volume ratio of 4L:1L, stir, then add 20kg of ammonium tetramolybdate, heat and stir, the heating temperature is 120°C, and the stirring speed is 120r / min to form a mother liquor. Adjust the pH value of the mother liquor between 7.2 and the density of 1.3g / cm 3 between.

[0023] Slowly add cerium nitrate solution to the mother liquor, the mass percentage of cerium nitrate is not more than 4%, heat and evaporate...

Embodiment 3

[0025] With yttrium oxide 60g, add beaker according to the ratio of yttrium oxide: nitric acid=1kg: 2L, heating and stirring, heating temperature is 130 ℃, can make yttrium nitrate solution until solution is clarified; Nitric acid mass percentage concentration is 67%.

[0026] Add 40L of soft water and 8L of ammonia water to the crystallization tank according to the ratio of 5L:1L, stir, then add 20kg of ammonium tetramolybdate, heat and stir, the heating temperature is 120°C, and the stirring speed is 120r / min to form a mother liquor. Adjust the PH value to 7.8 and the density at 1.25g / cm 3 Time.

[0027] Slowly add yttrium nitrate solution to the mother liquor. The total mass percentage of the yttrium nitrate solution does not exceed 2.5% of the total mass of ammonium dimolybdate. It can be mixed in any ratio, evaporated and crystallized. The time is 3.0 hours, and the heating temperature is 110°C. When the density reaches 1.48, the material is centrifuged and dried, and th...

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Abstract

Production of rare earth ammonium dimolybdate is carried out by adding ammonium tetramolybdate with ammonium tetramolybdate : soft water: ammonia water = 1kg: 4-5L: 1L, heating agitating, forming mother liquid, regulating the pH value of mother liquid between 7-8.5, adding the cerium nitrates, lanthanum nitrates or illinium nitrates into the mother liquid, heating evaporating for 2.0-6.0hrs with heating temperature 100deg.C-130deg.C until the solution transparent, discharging the materials, pumping filtering, drying with temperature 110-150deg.C for 6-8hrs, and obtaining the rare earth ammonium dimolybdate. It achieves low cost, higher material processing and using performance and no environmental pollution.

Description

technical field [0001] The invention relates to the field of molybdenum alloy preparation, in particular to a preparation process of rare earth ammonium dimolybdate. Background technique [0002] Because of its good high-temperature performance, molybdenum metal has very important uses in national defense, electronics, metallurgy, machinery, lighting and other industries, so it has become a rare metal with strategic value. However, due to the characteristics of molybdenum metal oxidation resistance and low temperature brittleness, it is difficult to meet higher performance requirements. Therefore, material experts continue to improve the performance of molybdenum metal materials through mechanisms such as dispersion strengthening, solid-solution strengthening, and precipitation strengthening. For the preparation of alloys with the above strengthening mechanism, the prerequisite is to improve the uniformity of the alloy composition, that is, the alloy composition is fine and ...

Claims

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Application Information

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IPC IPC(8): C01F17/00C01G39/00
Inventor 孙军孙院军罗建海张国君唐利侠王林
Owner 临沂市科创材料有限公司
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