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A method for dephosphorizing high-phosphorus iron ore by utilizing fermented liquid of Aspergillus niger strain

A strain of Aspergillus niger, the technology of Aspergillus niger, applied in the direction of improving process efficiency, etc., can solve the problems of high filtration cost, low pulp concentration, poor dephosphorization effect, etc., and achieve the effect of increasing the hydrolysis rate and shortening the leaching cycle

Active Publication Date: 2019-06-21
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, domestic and foreign studies on the use of fungi to dephosphorize high-phosphorus iron ore are rare, and most of them have problems such as long cycle time, low pulp concentration, poor dephosphorization effect, and high filtration costs after leaching.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The high-phosphorus iron ore, mainly hematite and limonite, with an iron grade of 43.50% and a phosphorus content of 0.85%, will be ground by a ball mill to -74μm and account for 100% for later use. Inoculate the mycelium of Aspergillus niger in the bioreactor, the temperature is controlled at 32°C, and 5L of non-sterilized phosphorus-containing medium is added, the main components of which are: K 2 HPO 4 1.0g, 50g of sucrose, (NH 4 ) 2 SO 4 2.5g, NaCl0.5g, MgSO 4 ·7H 2 O 0.5g, KCl 1.0g, MnSO 4 ·H 2 O 0.02g, FeSO 4 ·7H 2 O 0.010g, distilled water 5L, natural pH value, aerated culture for 72h, the average dissolved oxygen solubility is 6.57mg / L, the pH value drops to 1.28, then the mycelium is separated from the fermentation broth by filtration, and the mycelium remains in the bioreactor Continue to add fresh medium to culture, add the fermented liquid into the leaching reactor to carry out the leaching dephosphorization reaction, leaching the ore at room temp...

Embodiment 2

[0029]The high-phosphorus iron ore, mainly hematite and limonite, with an iron grade of 42.37% and a phosphorus content of 0.92%, will be ground by a ball mill to -74μm, accounting for 98.71%, and then used for later use. Inoculate the mycelia of Aspergillus niger in the bioreactor, the temperature is controlled at 33°C, and 5L of non-sterilized phosphorus medium is added, the main components of which are: K 2 HPO 4 0.9g, sucrose 48g, (NH 4 ) 2 SO 4 2.6g, NaCl0.45g, MgSO 4 ·7H 2 O 0.49g, KCl 0.9g, MnSO 4 ·H 2 O 0.018g, FeSO 4 ·7H 2 O 0.011g, distilled water 5L, natural pH value, aerated culture for 96h, the average dissolved oxygen solubility is 6.68mg / L, the pH value is reduced to 1.21, then the mycelium is separated from the fermentation broth by filtration, and the mycelium remains in the bioreactor Continue to add fresh medium to culture, add the fermented liquid into the ore leaching reactor to carry out the dephosphorization reaction of ore leaching, ore leach...

Embodiment 3

[0031] A certain high-phosphorus iron ore, mainly magnetite, with an iron grade of 54.92% and a phosphorus content of 0.83%, will be ground by a ball mill to -74μm and account for 91.34% for use. Inoculate the mycelium of Aspergillus niger in the bioreactor, the temperature is controlled at 35°C, and 5L of non-sterilized phosphorus-containing medium is added, the main components of which are: K 2 HPO 4 1.1g, sucrose 52g, (NH 4 ) 2 SO 4 2.7g, NaCl 0.50g, MgSO 4 ·7H 2 O 0.47g, KCl 0.8g, MnSO 4 ·H 2 O 0.022g, FeSO 4 ·7H 2 O 0.012g, distilled water 5L, natural pH value, aerated culture for 84h, the average dissolved oxygen solubility is 5.90mg / L, the pH value drops to 1.18, then the mycelia and fermentation broth are filtered, and the mycelium remains in the bioreactor Continue to add fresh medium for cultivation, add the fermented liquid into the ore leaching reactor to carry out the leaching dephosphorization reaction, ore leaching at room temperature, the pulp concen...

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Abstract

The invention relates to a method for performing high-phosphorus iron ore dephosphorization utilizing aspergillus niger strain fermentation liquor. The method comprises the following steps of: cultivating and fermenting an aspergillus niger strain in a biological reactor, separating, and enabling the separated aspergillus niger strain fermentation liquor to perform mineral leaching and dephosphorization on crushed high-phosphorus iron ores at a constant temperature in a mineral leaching reactor; and performing solid-liquid separation to obtain dephosphorized iron ores. The aspergillus niger strain fermentation liquor disclosed by the invention has a remarkable dephosphorization effect in treating high-phosphorus iron ores, is good in dephosphorization effect in a high-phosphorus iron ore dephosphorization technology, can shorten a microorganism mineral leaching period, and improves slurry concentration; and aspergillus niger hyphae can be repeatedly used for many times, and mineral-leached liquid also can be re-added with energy resource substances for being recycled for many times, so that realizable science and technology basis is provided for development and utilization of richhigh phosphorous iron ores of China.

Description

technical field [0001] The invention relates to the field of microbial hydrometallurgy, in particular to a method for dephosphorizing high-phosphorus iron ore by using the fermented liquid of Aspergillus niger strain. Background technique [0002] Plenty of high-phosphorus iron ore exists worldwide. my country's high-phosphorus iron ore reserves account for 14.86% of the total reserves, reaching 7.45 billion tons. With the development of the metallurgical industry, my country's limited rich ore and easy-to-select iron ore resources have been gradually exhausted, and the available iron ore resources tend to be poor, fine and miscellaneous. my country's Hunan, Hubei and the Yangtze River Basin contain a large amount of phosphorus-containing iron ore. The phosphorus content of Meishan iron ore reaches 0.38%. Phosphorus requirements for iron ore concentrates vary, ranging from roughly 0.05% to 0.30%. [0003] Hematite, the main mineral in high-phosphorus iron ore, is generally...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/18
CPCC22B3/18Y02P10/20
Inventor 李育彪王兵魏桢伦张欢韩志韬
Owner WUHAN UNIV OF TECH
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