Diammonium tridecaoxotetramolybdate
diammonium tridecaoxotetramolybdate(2-)
CAS: 12207-64-6
Molecular Formula: Mo4O13.2H4N
Diammonium tridecaoxotetramolybdate - Names and Identifiers
Diammonium tridecaoxotetramolybdate - Physico-chemical Properties
| Molecular Formula | Mo4O13.2H4N |
| Molar Mass | 627.82 |
| Storage Condition | Room Temprature |
| Physical and Chemical Properties | Colorless or pale yellow-green monoclinic crystals. Soluble in water, acid and alkali, insoluble in alcohol. |
Diammonium tridecaoxotetramolybdate - Reference Information
| Overview | Ammonium tetramolybdate, commonly known as AQM, is slightly soluble in water, soluble in alkali and ammonia, and insoluble in alcohol. Commonly used in the production of hydrogenation, desulfurization and other petroleum refining catalysts, trace element fertilizers, ceramic pigments, pigments and other molybdenum compounds. |
| chemical composition | the chemical composition of ammonium tetramolybdate product is shown in fig. 1. Its product particle size is ≤ 20 μm. Fig. 1 shows the chemical composition of ammonium tetramolybdate (%) |
| preparation method | 1. the principle process flow of molybdenum concentrate oxidation roasting → (ammonia water) one-stage leaching → purification → acid precipitation → ammonium tetramolybdate is adopted. considering the high copper content in molybdenum concentrate, one-stage ammonia leaching residue is returned to one-stage leaching after two-stage ammonia leaching to purify the obtained by-product-copper concentrate. The process flow chart is shown in Figure 2. Fig. 2 is the process flow chart of the principle of preparing ammonium tetramolybdate from molybdenum concentrate 2. ammonium tetramolybdate was prepared by the decomposition method of mixed solution by hydrochloric acid monochlorination. The process is as follows:(1) Oxidation roasting: it is carried out in an electric rotary furnace. Under the condition of 400-700 ℃, sulfide molybdenum concentrate is oxidized into molybdenum oxide, and its reaction formula: fig. 3 is the reaction formula of oxidation roasting (2) decomposition of molybdenum calcine: the roasted molybdenum calcine is put into HCl and NH4Cl solution for decomposition. Molybdenum in the form of molybdenum oxide in the baking sand is converted into polymolybdic acid and its salts into the slag phase (solid phase); metal impurities are converted into soluble chlorides and transferred to the decomposition liquid (liquid phase). The reactions that occurred were: MoO3 HCl → H2MoO4 ↓ nMoO3 2NH4Cl 2H2O →(NH4)2O · nMoO3 ↓ 2HClMeMoO4 HCl → MeCl2 H2MoO4 ↓ nMeMoO4 2NH4Cl 2(n-1)HCl →(NH4)2O · nMoO3 ↓ (n-1)H2O nMeCl2(3) Conversion and purification of polymolybdate: The slag phase (solid phase) after acid treatment is leached with ammonia water, and molybdenum is transferred to liquid phase in solid phase. However, a large amount of ammonia insoluble matter (impurities) remains in the solid phase, so that the impurity elements and molybdenum are further separated and purified. The above reaction formula is as follows:(NH4)2O · nMoO3 2(n-1)NH4OH → n(NH4)2MoO4 (n-1)H2OH2MoO4 2NH4OH →(NH4) 2MoO42H2O (4) crystallization to precipitate ammonium tetramolybdate: after concentration of purified ammonium molybdate solution (semen), dilute nitric acid is added to inhibit pH = 2, and ammonium tetramolybdate crystallization can be precipitated. 4(NH4)2MoO4 6HNO3→(NH4)2O·4MoO3↓ 6NH4NO3 3H2O |
| application | raw materials for producing petroleum refining catalysts such as hydrogenation and desulfurization, trace element fertilizers, and ceramic pigments, pigments and other molybdenum compounds. (2015-11-23) |
Last Update：2024-04-10 22:29:15
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