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Comprehensive utilization method for boron-extraction and iron-extraction tailings of ludwigite

A technology of mafic ore and iron tailings, which is applied in the field of comprehensive utilization of secondary resources, can solve problems such as environmental pollution and waste of resources, achieve high purity, realize zero discharge of solid waste, and simple process technology

Active Publication Date: 2021-07-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main minerals in the above alkaline tailings are sodium magnesium silicate and a small amount of boron that has not been leached. Without further treatment or improper treatment, it will not only cause waste of resources, but also cause serious environmental pollution.

Method used

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  • Comprehensive utilization method for boron-extraction and iron-extraction tailings of ludwigite
  • Comprehensive utilization method for boron-extraction and iron-extraction tailings of ludwigite
  • Comprehensive utilization method for boron-extraction and iron-extraction tailings of ludwigite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Using the above tailings as raw materials, the liquid-solid mass ratio is 6:1, the water immersion temperature is 180° C., and the water immersion time is 6 hours. After leaching, the leachate and leach residue are obtained by filtration. Inject CO into the leaching solution 2The gas and leachate are concentrated by evaporation and crystallized step by step to separate borax and sodium carbonate crystals. The leached slag is pressed and formed under a pressure of 100-150 MPa, and dried; after treatment, it is roasted for 2-3 hours in an oxidizing atmosphere at 1300-1350 ° C to obtain a magnesia refractory material.

[0036] The leaching rates of boron and sodium during the leaching process in Example 1 were 95.69% and 95.41%, respectively. The refractoriness of the refractory material prepared by leaching slag is between 1600°C and 1650°C, and the bulk density and apparent porosity are 1.48g / cm3 respectively. 3 , 1.88%.

[0037] Inject CO into the leaching...

Embodiment 2

[0038] Example 2: Using the above tailings as raw materials, the liquid-solid mass ratio is 8:1, the water immersion temperature is 180° C., and the water immersion time is 6 hours. Inject CO into the leaching solution 2 The gas and leachate are concentrated by evaporation and crystallized step by step to separate borax and sodium carbonate crystals. The leached slag is pressed and formed under a pressure of 100-150 MPa, and dried; after treatment, it is roasted for 2-3 hours in an oxidizing atmosphere at 1300-1350 ° C to obtain a magnesia refractory material.

[0039] The leaching rates of boron and sodium during the leaching process in Example 2 were 96.47% and 95.94%. The refractoriness of the refractory material prepared by leaching slag is 1610℃~1670℃, and the bulk density and apparent porosity are 1.49g / cm3 respectively. 3 , 1.85%.

[0040] Inject CO into the leaching solution 2 Gas, convert the boron in the solution into borax, and convert the remaining sodium into ...

Embodiment 3

[0041] Example 3: Using the above tailings as raw materials, the liquid-solid mass ratio was 8:1, the water immersion temperature was 180° C., and the water immersion time was 5 hours. After leaching, the leaching solution and leaching residue were obtained by filtration. Inject CO into the leaching solution 2 The gas and leachate are concentrated by evaporation and crystallized step by step to separate borax and sodium carbonate crystals. The leached slag is pressed and formed under a pressure of 100-150 MPa, and dried; after treatment, it is roasted for 2-3 hours in an oxidizing atmosphere at 1300-1350 ° C to obtain a magnesia refractory material.

[0042] The leaching rates of boron and sodium during the leaching process in Example 3 were 96.69% and 96.41%. The refractoriness of the refractory material prepared by leaching slag is 1630℃~1680℃, and the bulk density and apparent porosity are 1.49g / cm3 respectively. 3 , 2.105%.

[0043] Inject CO into the leaching solution ...

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Abstract

The invention provides a comprehensive utilization method for boron-extraction and iron-extraction tailings of ludwigite. The method comprises the following steps: carrying out high-temperature and high-pressure water leaching on magnetic separation tailings, and filtering a product obtained after water leaching to obtain a leachate and leaching residues; introducing CO2 gas into the leachate, and separating borax and sodium carbonate crystals out from the leachate through evaporation, concentration and fractional crystallization; forming and sintering the leaching residues to prepare a magnesium refractory material; carrying out high-temperature and high-pressure water immersion in a closed environment, wherein the water immersion temperature is greater than or equal to 150 DEG C. The method has the characteristics of simple process flow, high production efficiency, high added value of products and the like. Zero emission of solid waste and efficient recovery and utilization of boron and sodium are achieved, technical support is provided for efficient value-added utilization of ludwigite resources rich in reserves in China, and the method has very wide application and popularization prospects.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of secondary resources, and relates to a method for comprehensive utilization of boron and iron tailings from mafic ore. Background technique [0002] Boron mafic ore accounts for 57.88% of my country's boron resources, and the boron ore reserves in Liaodong alone reach 280 million tons, of which B 2 o 3 The reserve is 21.84 million tons, which belongs to the large boron deposit. Magnesite resources are currently the main body of boron resource development and utilization in my country, but the grade is low (average B 2 o 3 :7%~8%), the mineral composition is complex, the crystal grain size is fine and uneven, and it is difficult to select and smelt. At present, the treatment process of boron mafic ore in my country is as follows: magnetic-gravity separation to obtain boron concentrate, iron concentrate and tailings, about 40% of B 2 o 3 Into boron concentrate, 30% B 2 o 3 into bor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/12C01D7/24C04B33/138C04B35/66
CPCC01B35/123C01D7/24C04B35/66C04B33/138C01P2006/80C04B2235/77C04B2235/9607Y02P40/60
Inventor 饶明军张鑫李光辉姜涛游锦香罗骏彭志伟肖涛段骄洋
Owner CENT SOUTH UNIV
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