Molybdenum Products

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1. Unit process technology

1.1 Decomposition of mineral

After careful analysis of chemical composition of low-grade nickel-molybdenum mine on the basis of the composition and phase, focus on the decomposition of alkaline reagents on mineral effects, including direct decomposition of NaClO + NaOH; minerals calcined by the oxidation of decomposition with NaOH; with Na  2CO Roasting Houzai  3 leaching of mineral water decomposition.Several methods have achieved these good results, and has been used in industrial practice. China Nonferrous network. Alkaline low-grade nickel-molybdenum reagent to decompose minerals, outstanding advantages, a higher extraction rate of molybdenum, and nickel left in the leaching residue, molybdenum nickel can be completely separated.

1.2 Mo enrichment and transformation

Decomposition of low-grade molybdenum mineral solution is characterized by the molybdenum concentration is not high, and high impurity content corresponding to the effective recovery of molybdenum which must be enriched in molybdenum, preferably at the same time to achieve separation of molybdenum and most of the impurities.

We practice in the production of acid medium by adsorption of molybdenum from the process, alkaline leaching solution to adjust pH value to 3 to 4, the use of weakly basic macroporous resin, molybdenum to more radical ion and impurities with acid radical ions are adsorbed, the biggest advantage is that resin high adsorption capacity of molybdenum, the best performance of selected domestic resin adsorption capacity of molybdenum up to 140 mg / mL or more, and adsorption properties of stable, easy analysis of molybdenum with ammonia as resolution agent, can get high concentrations of Ammonium molybdate solution.

The inadequacies of this method is P, As, Si, and Mo was adsorbed together into stripping fluid, to be a single set purification process. China Nonferrous network. Resolution process, the exothermic reaction so that the local temperature of the resin layer increases, the potential risk of resin, and the analytic solution pH value is lower, the precipitation of crystals and cause obstruction.

We practice in the production of concentration by adjusting the resolution, the resolution process at different times using different analytical flow agent solves this problem.

1.3 Impurity

As mentioned above, the molybdenum ion exchange process, P, As, Si and other impurities in the form of molybdenum heteropoly acid radical adsorbed by the resin, parsed, and molybdenum into the analytical solution together, and there is a very high concentration, purification process must be a single set in order to ensure the quality of molybdenum products. China Nonferrous network. We succeeded in purifying the ammonium tungstate solution of magnesium introduced from the ammonium molybdate solution method to remove P, As, Si, received an ideal impurity effect.

The key of technology is the solution pH value of the pre-adjustment, the amount of magnesium ammonium reagent and adding speed, solution pH value of the control endpoint. China Nonferrous network. Over the years production practice proves that the technology can meet the high-impurity molybdate solution from the production of high purity ammonium requirements.

1.4 Separation of Molybdenum Vanadium

The nature of vanadium and molybdenum are more similar in all types of low-grade molybdenum and molybdenum mineral waste catalyst, contain a certain amount of vanadium. China Nonferrous network. Alkaline minerals in the decomposition of molybdenum and molybdenum ion exchange enrichment process, the vanadium and molybdenum are always well attended. China Nonferrous network. Vanadium is a product of the harmful impurities of molybdenum, vanadium and more with a small amount of ammonium molybdate, the appearance is light yellow to the naked eye can be identified, and vanadium itself is necessary for recycling valuable metals. China Nonferrous network. Therefore, molybdenum vanadium molybdenum production process well separated and effective recovery of vanadium is very important.

Ammonium salt in the presence of the conditions there, vanadium can form ammonium metavanadate pH 7.0 ~ 9.0 from the crystallization solution molybdate and molybdenum separation. China Nonferrous network. Enrichment of molybdenum ion exchange process for the isolation of vanadium has created the necessary conditions for analysis by the ammonium molybdate solution, no special treatment, standing time, vanadium can be crystallized in the form of ammonium metavanadate, vanadium molybdenum reached a preliminary separation, and can focus on recovery of vanadium from the sediment. China Nonferrous network. After the initial purification of V2O5 content of ammonium molybdate solution can be reduced to 0.3 g / L from top to bottom. China Nonferrous network. In order to obtain high purity ammonium molybdate product, must be the depth of molybdenum vanadium separation.

By ion exchange from pH 6.0 ~ 8.0 in the ammonium molybdate solution in the selective adsorption of vanadium, adsorption contact time 20 ~ 80 min, treatment V2O  5 content of 0.05 ~ 1.2 g / L of ammonium molybdate solution, the general control of effluent V2O5 content of about 0.02 g / L for the adsorption of the end, to meet the production of high purity ammonium molybdate product requirements. China Nonferrous network. The V2O5/Mo mass ratio of up to 0.001% or less. China Nonferrous network. After loading resin resolution can be directly used for the next round of adsorption, analysis from molybdenum, vanadium mixed solution prior to return to the ion-exchange liquid modulation process. China Nonferrous network. This technique can be deep separation of vanadium, vanadium can concentrate valuable metals recovery, and almost no process loss of molybdenum.

1.5 Remove the tungsten

Use the same multi-tungstate ions have greater affinity for ion exchange resins with high molybdenum from ammonium molybdate solution with low tungsten selective adsorption of tungsten, tungsten addition to obtaining a good result. China Nonferrous network. The technology is the key: to be dealing with the pretreatment solution, the adsorption of tungsten easily generated with the multi-tungstate ion, which is still essentially a single molybdenum molybdate root form, separation of molybdenum and tungsten for the creation of necessary conditions; choose the appropriate ion exchange resin, and a reasonable ion exchange process parameters. China Nonferrous network. Molybdenum content of 50 ~ 250 g / L, tungsten and molybdenum than 5 × 10   -4  ~ 2 × 10   -2  of ammonium molybdate solution, the inorganic acid to adjust pH value of  7.0 ~ 8.5,  and store After some time, according to contact time  1 ~ 1.5 h  flow rate, through the addition of tungsten anion exchange resin bed, to be effective from the high concentration of ammonium molybdate solution to remove trace tungsten. China Nonferrous network. Loaded resin with a very convenient analytical alkaline solution, the mixture further recovery from molybdenum and tungsten, resin regenerated with HCl, re-use.

At present, the process has been in China three factories into industrial applications, of which a plant has been running for 1 year.

1.6 Acid-liquor treatment

Acid precipitation mother liquor to adjust pH to 7.0 or so, by ion exchange after the recovery of molybdenum, by electrodialysis for desalination and concentration, water reuse, including NH  4NO  3 of the dense water evaporation to the proportion of  1.20 ~ 1.40 g / cm  3 , add gypsum powder, slurry through 120 ~  200 ℃  centrifugal spray drying, production of agricultural fertilizers, chemical fertilizers from the prepared sample shows not only high-nitrogen, it also contains a small amount of molybdenum, can be used as compound fertilizer containing trace elements raw materials.

2 low-grade polymetallic ore production of high purity molybdenum ammonium whole process of industrial practice

The process has the following characteristics:

a. a variety of low-grade molybdenum raw materials can be handled;

b. process the introduction of the ion exchange technology, and selected high quality resin adsorption capacity, which process high-molybdenum enrichment factor, which, irrespective of raw materials, in addition to mineral decomposition slightly different, but both are united in the same process carried out is very convenient;

c. The process in the recovery of valuable elements in minerals Mo, Ni at the same time, but also effectively enriched recovery V. China Nonferrous network. Containing about 6% for Mo, Ni containing minerals for about 3%, Mo and Ni recovery could reach 90% and 98%;

d. The process contains several patented technologies, especially separation of molybdenum and vanadium molybdenum and tungsten separation technology, to ensure that the advanced nature of the process and product quality;

e. using the technology, raw materials can be prepared by the national standard level of ammonium molybdate product.

At present, application of the technology developed by nickel-molybdenum ore and molybdenum processing plant has reached eight iron alloy.