SU1693105A1 - Method of processing molybdenum concentrates - Google Patents

Abstract

This invention relates to hydrometallurgy of molybdenum, in particular to methods for processing molybdenum concentrate. The purpose of the invention is to increase the technological parameters of the process by reducing the loss of molybdenite, the consumption of reagents and reducing the duration of the technological process. 65 kg of molybdenum concentrate containing 50% Mo are loaded into the reactor and subjected to nitrous acid decomposition for 8 hours at 85 ° C, T: W 1: 5, acid concentration 400 g / l. After sorption release of molybdenum and rhenium on the resin and resin extraction, the resulting pulp is filtered and the solid phase — the cake is leached with a 25% ammonia solution at T: W 1: 5 for 1 hour. The ammonium leach pulp is again filtered and the resulting cake is repulped with water T : F 1: 8 and for 1 h pass through a gravity concentrator. The result is a gravity concentrate (1.96 kg) containing 47.3% Mo and final tailings containing 0.9% Mo. The concentrate yield is 5.6%. and tailings 53.7%. The method provides an increase in the extraction of molybdenum in ammonium molybdate by 1.5%, a decrease in the content of molybdenum in the tailings to 0.9%, reduces the duration of the process by 2 times. 7 tab. with s

Description

This invention relates to hydrometallurgy of molybdenum, in particular to methods for processing molybdenum concentrates.

The purpose of the invention is to increase the technological indicators of the process by reducing the loss of molybdenite. The consumption of reagents and reducing the duration of the technological process.

Example. 65 g of a mixture of molybdenum concentrates KM 1 and KM 4 (1: 1 ratio) containing 50% Mo are loaded into the reactor and subjected to nitric acid decomposition for 8 hours (at 85 ° С Т Ж - 1: 5, НМОз 400 g / l) After sorption separation of molybdenum and rhenium on the resin and sieve separation of the resin by a known method, the pulp is filtered and the solid phase is leached with an ammonia solution (NhUOH 25 g / l, T: F 1: 5) for 1 h. The pulp of ammonium leach is again filtered and the resulting cake is repulped with water for. 1 h is passed through a gravity concentrator. The result is a gravitational molybdenum concentrate {1.96 kg) containing 47.3% Mo and tailings. The output of the concentrator is 5.6%.

Technological parameters are given in table 1.

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Example 2. 74 kg of molybdenite concentrates of the same composition as Example 1 are loaded into the reactor and subjected to nitric acid decomposition for 4 hours (at 87 ° C, T: F 1: 5, HM03 400 g / l). After that, 1.96 kg of the concentrate obtained in example 1 by gravity enrichment is loaded into the reactor, and the acid decomposition of molybdenite is continued for A h. Subsequent processes are carried out similarly to example 1. As a result, the gravitational molybdenite concentrate (2.24 kg) is obtained containing 47.2% Mo. The concentrate yield is 5.6%.

Technological parameters are given in table 2.

Example 3 (by a known method). 35 kg of cakes obtained after filtration of ammonium leaching pulp of Example 1 are loaded into the reactor and subjected to nitric acid decomposition for 8 hours (at 85 ° C, T: W 1: 2. NMO400 g / l). The resulting filter cake is leached with an ammonia solution (25 g / l. T: W 1: 4) for 1 hour. The ammonium leach pulp is filtered again. The result is 14 kg of waste tail containing 3.2% Mo.

Technological indicators are given in table.3.

Table 4 presents data on the effectiveness of the use of gravity concentrate and concentrated table.

Gravity enrichment is performed to obtain light and heavy fractions, respectively tails and molybdenum concentrate.

In tab. 5 presents data on the density of the obtained fractions.

All the results of subsequent experiments are given in table. 6 and 7.

Claims (1)

The method as a whole allows for an increase in the concentration of molybdenum in the ammonia solution by 0.9 g / l (i.e., an increase in ammonium molybdate recovery by 1.5%), the content of molybdenum in tailings decreases to 0.9%, material and energy costs and the process is shortened by a factor of 2, eliminating the use of nitric acid to further extract molybdenum. The invention The method of processing molybdenum concentrates, including processing it with nitric acid to produce pulp, processing the resulting pulp with an ion exchange resin to obtain a resin containing molybdenum and molybdenum-containing pulp, filtering the pulp to obtain a solution of nitric acid and molybdenum-containing sediment; leaching the precipitate with an ammonia solution to obtain a solution of ammonium molybdenum and molybdenum-containing tailings; and the subsequent extraction of molybdenum and ammonium molybdate solution and tailing treatment, characterized in that, in order to improve technological performance by reducing molybdenum losses, reducing reagent consumption and shortening of the process, tailing treatment is carried out by gravitational enrichment. a tubular gravity concentrator divided into a light fraction with a density of 0.39-0.34 g / cm3 and a heavy fraction enriched in molybdenum with a density of 1.51-1.99 g / cm3 with subsequent return of the heavy fraction to joint processing with the original concentrate. Table 1 table 2 Table 3 Table 4 Table 5