A kind of microwave reduction roasting and extraction method of manganese oxide ore

A technology of manganese oxide ore and extraction method, applied in the field of metallurgy, can solve the problems of high reduction temperature, complex composition, great influence of conditions, etc., and achieve the effects of mild leaching conditions, lower production costs, and low equipment requirements

Active Publication Date: 2019-01-11
CENT SOUTH UNIV
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  • Description
  • Claims
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Problems solved by technology

[0005] In summary, although biomass reduction roasting of manganese oxide ore can reduce roasting energy consumption in the traditional coal-based reduction roasting process to a certain extent, there are still problems such as large amount of reducing agent, high reduction temperature, and long roasting time.
Moreover, due to the variety of biomass resources, complex composition, unstable source and different types of manganese ore, the conditions of the reduction roasting-leaching process are greatly affected. In addition, in the roasting process, the particle size of manganese ore seriously affects the reduction efficiency of manganese. , and the content of impurity ions in the leaching solution is generally high, and the follow-up treatment is relatively difficult, which also limits the large-scale industrial application of biomass roasting and reducing manganese oxide ore to a certain extent.
In addition, in the process of expanding the test, the traditional roasting equipment often has sintering or cold center phenomenon, which cannot meet the requirements of industrialization.

Method used

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  • A kind of microwave reduction roasting and extraction method of manganese oxide ore

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Experimental program
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Effect test

Embodiment 1

[0030] The ore samples are taken from low-grade manganese oxide ore samples in Xiangxi, Hunan. The main manganese mineral is pyrolusite, with a manganese grade of 20.34%, an iron grade of 10.46%, a silicon dioxide of 37.22%, and aluminum oxide of 8.38%. The ore is crushed to a particle size below 74 μm. Alkali lignin was purchased from Shandong Weili Chemical Technology Co., Ltd., an industrial product with a molecular weight of 1,000 to 100,000. Its main technical indicators are: moisture≤7.0%, pH value (1% aqueous solution) 11~12, reduced content≤4.0%, Fineness (120 mesh sieve residue) ≤ 2.0%, calcium and magnesium content ≤ 0.5%.

[0031] Mix evenly according to the mass ratio of manganese oxide ore sample: alkali lignin: sodium sulfite = 100:15:5, place in a microwave reaction device for heating and roasting, control the roasting temperature at 150°C, and roast for 5 minutes. After the reaction is completed, roast the sand in the furnace Cool naturally, crush the calcined...

Embodiment 2

[0033] The ore samples are taken from manganese oxide ore in Guangxi, the main manganese mineral is pyrolusite, the grade of manganese is 27.78%, the grade of iron is 4.20%, the grade of silicon dioxide is 27.11%, and the grade of aluminum oxide is 8.53%. The ore is crushed to a particle size below 0.25mm. Alkali lignin is the same as in Example 1.

[0034] The amount of alkali lignin is 20% of manganese oxide ore, and the amount of sodium sulfite is 7.5% of manganese oxide ore. Mix them evenly and place them in a microwave reaction device, adjust the roasting temperature to 200°C, and roast for 10 minutes. Below 0.25mm, sulfuric acid concentration 1.5mol / L, liquid-solid ratio 4:1, stirring and leaching at 50°C for 10 minutes, the manganese leaching rate was 95.28%, and the TOC value (total organic carbon content) of the leachate was 25.3437mg / L. After solid-liquid separation, the filtrate can be purified by conventional purification and impurity removal methods to obtain qua...

Embodiment 3

[0036] The ore samples were taken from manganese oxide ore in Gabon, the main manganese mineral is pyrolusite, the grade of manganese is 45.62%, the grade of iron is 2.75%, the grade of silicon dioxide is 10.78%, and the grade of aluminum oxide is 9.65%. The ore is ground to a particle size of 0.25mm or less. Alkali lignin is the same as in Example 1.

[0037] Prepare the mixture of additives and ore samples, control the alkali lignin to be 30% of the manganese oxide ore, and the amount of sodium sulfite to be 7.5% of the manganese oxide ore. After cooling, crush the calcined sand to less than 0.25mm, add sulfuric acid solution with a concentration of 1.5mol / L and stir for leaching, control the leaching conditions as liquid-solid ratio 10:1, leaching temperature 50°C, leaching time 10min, solid-liquid separation leaching slag and leachate, the manganese leaching rate was 95.67%, and the TOC value (total organic carbon content) of the leachate was 31.2143mg / L. The concentrati...

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Abstract

The invention discloses a microwave reduction roasting and extracting method for manganese oxide ore. The method includes the following steps that the manganese oxide ore and a lignin type additive are weighed and crushed; sulfite is weighed, the lignin type additive, the sulfite and the manganese oxide ore are evenly mixed, and then a mixture is added into a microwave reaction device to be subjected to reduction roasting, so that a roasted product is obtained; the obtained roasted product is crushed and added into a low-concentration sulfuric acid solution, and stirring and acid leaching are conducted, so that leachate is obtained; and the obtained leachate is subjected to solid-liquid separation to obtain filter liquor and filter residues, and the obtained filter liquor is purified to obtain manganese sulfate purified liquid which is used for producing manganese products. The microwave roasting process has the advantages that reduction leaching efficiency is high, the roasting condition is mild, the equipment requirement is low, the leaching condition is mild, and the total content of organic carbon and the residual rate of other impurity metal ions in the leachate are low; and no new impurity is introduced in the leaching process, and efficient leaching of the manganese oxide ore is achieved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a microwave reduction roasting and extraction method of manganese oxide ore. Background technique [0002] Manganese ore is one of the important basic raw materials in the industry. In recent years, with the rapid growth of my country's iron and steel industry, the output of my country's manganese alloy and electrolytic manganese industry has ranked first in the world. The demand for manganese ore in the domestic market is increasing day by day, the contradiction between supply and demand is fierce, and the dependence on imported manganese ore is getting higher and higher. As the price of imported manganese ore continues to rise, the production cost of manganese products is also getting higher and higher. The development and utilization of manganese oxide ore, which is rich in domestic resources, can not only alleviate the problems caused by the shortage of manganese resources...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B47/00C22B1/02C22B3/08
CPCC22B1/02C22B3/08C22B47/00Y02P10/20
Inventor 钟宏武芳芳王帅曹占芳刘广义
Owner CENT SOUTH UNIV
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