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Molybdic acid and production process thereof

A production process, technology of molybdenum acid, applied in the direction of molybdenum compounds, inorganic chemistry, chemical instruments and methods, etc., can solve the problems of complex production, complex process, single raw material, etc., and achieve strong adaptability, simple process and high processing cost Effect

Pending Publication Date: 2022-04-05
成都虹波钼业有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current conventional production process has a single raw material and strict requirements on raw material impurities; secondly, nitric acid precipitation is used, which produces a large amount of sodium nitrate wastewater, resulting in high wastewater treatment costs; finally, the general process of molybdic acid removal is relatively complicated, and the production is complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of production technology of molybdic acid, comprises the steps:

[0024] S1. The molybdenum calcined sand is leached with NaOH solution to obtain a sodium molybdate leaching solution with a pH value of 8.

[0025] S2. The sodium molybdate leaching solution obtained in step S1 is subjected to adsorption and impurity removal treatment through an anion exchange resin to obtain an adsorption after-transaction solution;

[0026] Among them, the pH value of the solution for adsorption and impurity removal treatment is 7.5, the adsorption linear velocity is 2m / h, and the anion exchange resin is used to remove anion impurities such as P, AS, Si, W, V in the solution.

[0027] S3, heating the adsorbed liquid obtained in step S2, adding hydrochloric acid, stirring, filtering, washing, and drying to obtain molybdic acid particles A1;

[0028] Among them, the concentration of molybdenum in the post-adsorption solution is 118.5g / L, the heating temperature is 95°C, and the ac...

Embodiment 2

[0030] A kind of production technology of molybdic acid, comprises the steps:

[0031] S1. The molybdenum calcined sand is leached with NaOH solution to obtain a sodium molybdate leaching solution with a pH value of 7.

[0032] S2. The sodium molybdate leaching solution obtained in step S1 is subjected to adsorption and impurity removal treatment through an anion exchange resin to obtain an adsorption after-transaction solution;

[0033] Among them, the pH value of the solution for adsorption and impurity removal treatment is 7, the adsorption linear velocity is 1m / h, and the anion exchange resin is used to remove anion impurities such as P, AS, Si, W, V, etc. in the solution.

[0034] S3, heating the adsorbed liquid obtained in step S2, adding hydrochloric acid, stirring, filtering, washing, and drying to obtain molybdic acid particles A2;

[0035] Among them, the concentration of molybdenum in the post-adsorption solution is 68.4g / L, the heating temperature is 88°C, and the...

Embodiment 3

[0037] A kind of production technology of molybdic acid, comprises the steps:

[0038] S1. The crude molybdic acid is leached with NaOH solution to obtain a sodium molybdate leaching solution with a pH value of 12.

[0039] S2. The sodium molybdate leaching solution obtained in step S1 is subjected to adsorption and impurity removal treatment through an anion exchange resin to obtain an adsorption after-transaction solution;

[0040] Among them, the pH value of the solution for adsorption and impurity removal treatment is 12, the adsorption linear velocity is 4m / h, and the anion exchange resin is used to remove anion impurities such as P, AS, Si, W, and V in the solution.

[0041] S3. Heating the adsorption solution obtained in step S2, adding hydrochloric acid, stirring, drying and washing by centrifugation to obtain molybdic acid particles A3;

[0042] Among them, the concentration of molybdenum in the post-adsorption solution is 138.2g / L, the heating temperature is 99°C, a...

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Abstract

The invention provides molybdic acid and a production process thereof, and the production process comprises the following steps: S1, treating a molybdenum source with alkali liquor to obtain a sodium molybdate leaching solution; s2, the sodium molybdate leaching solution obtained in the step S1 is subjected to adsorption and impurity removal treatment, and an after-adsorption solution is obtained; s3, heating the adsorbed and exchanged liquid obtained in the step S2, adding hydrochloric acid, stirring, filtering, washing and draining to obtain molybdic acid particles; the production process of molybdic acid provided by the invention solves the problem of small selectivity of raw materials in the traditional process, and the molybdenum source is expanded from single high-quality molybdenum calcine to various raw materials such as sodium molybdate, heteromolybdic acid, ammonium polymolybdate and the like; secondly, the molybdic acid is prepared by hydrochloric acid precipitation, so that high treatment cost caused by sodium nitrate wastewater formed by nitric acid precipitation is avoided; ion exchange is adopted for impurity removal of the lixivium, and hazardous waste (sulfide slag) caused by impurity removal through ammonium sulfide is avoided; the production process is high in raw material adaptability, simple in process and environmentally friendly.

Description

technical field [0001] The invention relates to the field of catalyst production, in particular to a molybdic acid and a production process thereof. Background technique [0002] Molybdic acid (Molybdic Acid) is an inorganic compound with a molecular formula of H 2 MoO 4 . Refers to molybdenum trioxide and related substances in hydrated form. Usually in the hydrated form MoO 3 2H 2 O, with a molecular weight of 179.97, is a white or slightly yellow monoclinic columnar crystal or powder. Industrial products generally contain a small amount of ammonium molybdate, and the relative density is 3.124 (14°C). When dried in sulfuric acid or heated to 65-70°C, it loses crystal water and becomes anhydrous. Ignition into molybdenum trioxide. Slightly soluble in water or strong acid. Soluble in alkali solution, ammonia water, alkali metal carbonate solution and hydrogen peroxide solution. It exists in the form of molybdate in alkaline solution and ammonia water. It exists in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/00
Inventor 杨伟易建刘锦悦任倩高志强陈炜
Owner 成都虹波钼业有限责任公司
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