Method for associated producing ammonium molybdate and manganese sulfate by roasting molybdenite and pyrolusite

A technology of pyrolusite and molybdenite, applied to manganese sulfate, chemical instruments and methods, molybdenum compounds, etc., can solve the problems that have not been solved well, high energy consumption in the production process, and difficult to popularize and apply, etc., to achieve metal synthesis High recovery rate, low environmental pollution and simple equipment

Inactive Publication Date: 2007-10-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lime-molybdenum concentrate co-roasting process developed in the late 1980s is aimed at the SO2 of molybdenite during the roasting process. 2 Pollution and recovery of associated rhenium elements, the main role of lime is to fix sulfur (CaSO 4 ) and solid rhenium (Ca(ReO 4 ) 2 ), although the recoveries of molybdenum and rhenium can be increased to 95% and 74%, respectively, SO 2 The pollution problem has not been well resolved, and the consumption of raw materials, waste residue and waste liquid in the production process has increased significantly, so it is difficult to popularize and apply (Liu Yinghan. R

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Stir and mix 5 parts of molybdenite concentrate (containing Mo 47.4%) and 8 parts of pyrolusite (containing Mn 50.4%) (n MnO2 / n MoS2 =3.0), put the ore powder into the quartz tube and place it in a tube-type resistance furnace to heat up and roast. One end of the quartz tube is connected to a blower, and the air volume is controlled to be 25ml / min. The temperature is controlled at 500°C by a temperature controller, and roasted for 180min . Sulfur element analysis, Mo phase analysis, etc. were carried out on the roasted product. The results showed that the sulfur fixation rate was 94.8%, the Mo oxidation rate was 100%, and the main component of the sand was manganese molybdate (MnMoO 4 ).

[0030] The obtained manganese-containing Mo sand was leached by 100g / L sulfuric acid solution at room temperature (25°C), the solid ratio of the leaching liquid was 10, and the acid hydrolysis time was 90min, and the Mo(MoO 2 SO 4 ), Mn(MnSO 4) red solution and acid insoluble s...

Embodiment 2

[0033] Stir and mix 5 parts of molybdenite concentrate (containing Mo 47.4%) and 16 parts of pyrolusite (containing Mn 50.4%) (n MnO2 / n MoS2 =6.0), put the ore powder into the quartz tube and place it in a tubular resistance furnace for heating and roasting. One end of the quartz tube is connected to a blower, and the air volume is controlled to be 25ml / min. The temperature is controlled at 600°C by a temperature controller, and roasted for 90 minutes . Sulfur element analysis, Mo phase analysis, etc. were carried out on the roasted product, and the results showed that the sulfur fixation rate was 98.8%, the Mo oxidation rate was 100%, and the main component of the sand was manganese molybdate (MnMoO 4 ) and manganese sulfate.

[0034] The obtained manganese-containing Mo sand was leached by 300g / L sulfuric acid solution, the leaching was controlled at 65°C, the solid ratio of the leaching solution was 5, and the acid hydrolysis time was 300min, and the Mo(MoO 2 SO 4 ), ...

Embodiment 3

[0037] Stir and mix 15 parts of molybdenite concentrate (containing Mo 47.4%) and 8 parts of pyrolusite (containing Mn 50.4%) (n MnO2 / n MoS2 =2.0), put the ore powder into the quartz tube and place it in a tube-type resistance furnace to heat up and roast. One end of the quartz tube is connected to a blower, and the air volume is controlled to be 45ml / min. The temperature is controlled at 550°C by a temperature controller, and roasted for 120min . Sulfur element analysis, Mo phase analysis, etc. were carried out on the roasted product, and the results showed that the sulfur fixation rate was 91.8%, the Mo oxidation rate was 100%, and the main component of the sand was manganese molybdate (MnMoO 4 ).

[0038] The obtained manganese-containing Mo sand is leached by 30% nitric acid solution, the leaching is room temperature (25° C.), the leaching liquid-solid ratio is 15, and the leaching time is 30 min, and the red solution and acid-insoluble slag containing Mo and Mn are ob...

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Abstract

This invention discloses a method for combined production of ammonium molybdate and manganese sulfate by co-torrefication of molybdenite and pyrolusite. The method comprises: (1) mixing molybdenite and pyrolusite at a ratio of nMnO2:nMoS2 = 1.0-10.0; (2) co-torrefying the mixture at 350-950 deg.C for 60-360 min; (3) acidolyzing with an inorganic acid at 5-95 deg.C and a liquid/solid ratio of 1.0-50.0 for 5-300 min until the pH value is below 5.5; (4) extracting the leaching solution with solvent, separating to obtain an organic phase containing Mo and an aqueous phase containing Mn, and back-extracting the organic phase with ammonia to obtain ammonium molybdate; (5) processing into ammonium molybdate and manganese sulfate products by using the present metallurgical technique. The method has such advantages as short process, simple apparatus, low energy consumption, little pollution, high metal recovery rate, and high product quality.

Description

technical field [0001] The invention relates to a method for directly producing ammonium molybdate and manganese sulfate by using molybdenite and pyrolusite. Background technique [0002] Molybdenum is a very important rare metal element, widely used in metallurgy, chemical industry, machinery, aerospace and biology and other fields, and has become an increasingly important metal material. my country has large reserves of molybdenum resources, wide distribution, many types, and many compound ores. The proven reserves are 4.15Mt, ranking second in the world. It is one of the countries with the largest export volume of molybdenum products in the world. The production capacity of molybdenum concentrate is rapid. increase, and has reached 70kt / a at present. [0003] During the 1960s and 1970s, almost 90% of the production of pure molybdenum compounds in the world used the roasting-ammonia leaching process. The traditional roasting-ammonia leaching process is to oxidize and roas...

Claims

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Application Information

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IPC IPC(8): C01G39/00C01G45/10
Inventor 钟宏符剑刚王晖吴江丽
Owner CENT SOUTH UNIV
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