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A method for comprehensive recovery of aluminum, potassium, sodium and silicon from molybdenum tailings

A technology of molybdenum tailings and aluminum recovery, which is applied in the direction of improving process efficiency, can solve the problems of lack of economical and effective utilization methods, environmental pollution, etc., and achieve the effects of realizing waste utilization, reducing production costs, and protecting the ecological environment

Active Publication Date: 2019-03-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the lack of economical and effective utilization methods, most molybdenum tailings are still left idle, causing certain environmental pollution, and its effective treatment has long been an environmental issue of common concern to the whole society.
As far as the retrieved information is concerned, there is currently no report on the comprehensive recovery of aluminum, sodium, and potassium from molybdenum tailings.

Method used

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  • A method for comprehensive recovery of aluminum, potassium, sodium and silicon from molybdenum tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The raw material comes from molybdenum tailings in a mining area in Henan, and the main content of each component is SiO 2 : 71.52%, Al 2 o 3 : 11.32%, K 2 O: 4.98%, Na 2 O: 2.56%, CaO: 1.75%, MgO: 0.48%, Fe 2 o 3 : 0.68%.

[0035] According to the mass ratio, molybdenum tailings: calcium carbonate: sodium carbonate = 100:130:1.8, with molybdenum tailings, limestone, sodium carbonate;

[0036] After the raw ore is crushed and ground, mixed with limestone and sodium carbonate at a mass ratio of 100:130:1.8, the temperature is raised to 850°C for high-temperature roasting for 2 hours; the sintered product is dissolved in an aqueous solution, and the dissolution temperature is 65°C. The ratio is 2:1, the leaching time is 1h, and the leaching residue is filtered to obtain calcium orthosilicate product (the purity of calcium orthosilicate product is 92wt% and the content of Na is less than 0.02wt%) (the recovery rate of Si is 89%) , can be used as cement raw material;...

Embodiment 2

[0038] The raw material is molybdenum tailings from a place in Anhui, and the main content of each component is SiO 2 : 70.89%, Al 2 o 3 : 10.54%, K 2 O: 4.79%, Na 2 O: 2.13%, CaO: 1.53%, Fe 2 o 3 : 0.89%.

[0039] According to the mass ratio, molybdenum tailings: calcium carbonate: sodium carbonate = 100:120:1.9, with molybdenum tailings, limestone, sodium carbonate;

[0040] After the raw ore is crushed and ground, the mass ratio of limestone and sodium carbonate ore is 100:120:1.9, and the reaction temperature is 900°C for high-temperature roasting for 2.5 hours; is 3:1, the leaching time is 1h, the calcium orthosilicate product is obtained by filtering the leaching slag (the purity of the calcium orthosilicate product is 93% and the content of Na is less than 0.015wt%), can be used as cement raw material (the recovery rate of Si is 93%); the eluate is fed into the carbon dioxide gas in the airtight container to carry out the carbonization reaction, the pressure of t...

Embodiment 3

[0042] The raw material is molybdenum tailings from a place in Xi'an, and the main content of each component is SiO 2 : 71.28%, Al 2 o 3 : 10.69%, K 2 O: 5.12%, Na 2 O: 1.25%, CaO: 3.14%, Fe 2 o 3 : 2.35%.

[0043]After the raw ore is crushed and ground, the mass ratio of limestone and sodium carbonate ore is 100:125:1.2, and the reaction temperature is 950°C for high-temperature roasting for 3 hours; the sintered product is dissolved in an aqueous solution, the dissolution temperature is 85°C, and the liquid-solid ratio is 2:1, the leaching time is 0.5h, the calcium orthosilicate product is obtained by filtering the leaching slag (the purity of the calcium orthosilicate product is 95% and the content of Na is less than 0.01wt%), which can be used as cement raw material; Carbon dioxide gas is introduced into the container for carbonization reaction. The pressure of carbon dioxide gas introduced during the carbonization decomposition process is 2MPa, the reaction time is ...

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Abstract

The invention discloses a method for comprehensively recovering aluminum, potassium, sodium and silicon from molybdenum tailings. The method comprises steps as follows: the molybdenum tailings, excessive limestone and a proper amount of sodium carbonate are mixed uniformly, a mixture is subjected to roasting at the high temperature of 850-950 DEG C, a clinker is cooled and subjected to water leaching, after a dissolution liquid is subjected to desiliconizing purification, carbon dioxide gas is introduced into a closed container for a carbonation reaction, Al(OH)3 precipitates are separated out, a final solution is potassium-rich and sodium-rich solution and is evaporated step by step, and potash and soda are obtained. With effective utilization of the high-temperature roasting method, aluminosilicate minerals such as potassium feldspar and the like in the molybdenum tailings are decomposed, carbon dioxide and heat produced during roasting can be used for the follow-up carbonization reaction, waste gas utilization is realized, and ecological environment is protected. Comprehensive recovery of aluminum, potassium and sodium in the molybdenum tailings is realized, residues can be usedas raw materials of cement industry, and the problem of environmental pollution produced through stockpiling of the molybdenum tailings is solved completely.

Description

technical field [0001] The invention is a process for comprehensively recovering valuable components such as aluminum, potassium, sodium and silicon from molybdenum tailings as raw materials, and belongs to the interdisciplinary field of ecological environment and metallurgy. technical background [0002] With the massive development of molybdenum ore resources, the output of tailings is increasing, and the huge amount of tailings occupies a large amount of land, which brings heavy economic burdens to enterprises and seriously pollutes the ecological environment. How to use these tailings resources economically and effectively is the need of economic construction and environmental protection. At present, many researchers are still focusing on how to further extract molybdenum from molybdenum tailings; few people have been involved in how to fully utilize molybdenum tailings with high economic effects. [0003] Common minerals in molybdenum tailings include quartz, feldspar,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B3/04C22B3/44C22B21/00C22B26/10
CPCY02P10/20
Inventor 孙伟王丽胡岳华纪斌刘润清高建德张烨
Owner CENT SOUTH UNIV
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