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A method for comprehensive utilization of boron and iron tailings from boron and mafia ore

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 reduce apparent porosity

Active Publication Date: 2022-08-02
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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  • A method for comprehensive utilization of boron and iron tailings from boron and mafia ore
  • A method for comprehensive utilization of boron and iron tailings from boron and mafia ore
  • A method for comprehensive utilization of boron and iron tailings from boron and mafia ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0036] In Example 1, the leaching rates of boron and sodium in the leaching process were 95.69% and 95.41%, respectively. The refractoriness of the refractory prepared from the leaching slag is 1600℃~1650℃, and the bulk density and apparent porosity are 1.48g / cm, respectively. 3 , 1.88%.

[0037] Pour CO into the leachate 2 g...

Embodiment 2

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

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

[0040] Pour CO into the leachate 2 gas, the ...

Embodiment 3

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

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

[0043] Pour CO into the leachate 2 gas, the b...

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Abstract

The invention provides a method for comprehensive utilization of boron and iron tailings from boron and mafia ore. In the present invention, the magnetic separation tailings are subjected to high temperature and high pressure water leaching, and the products after water leaching are filtered to obtain leaching solution and leaching residue; CO is introduced into the leaching solution. 2 The gas and the leaching solution are evaporated and concentrated to separate out borax and sodium carbonate crystals by fractional crystallization; the leaching slag is formed-sintered to prepare magnesia refractories; the high temperature and high pressure water immersion is carried out in a closed environment, and the temperature of the water immersion is greater than or equal to 150 ° C. The invention has the characteristics of simple process flow, high production efficiency and high added value of products. The invention realizes zero discharge of solid waste and efficient recovery and utilization of boron and sodium.

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 boron and mafia ore. Background technique [0002] Boron-magnesia iron ore accounts for 57.88% of my country's boron resources, and the reserves of boron iron ore in Liaodong alone reach 280 million tons, of which B 2 O 3 The reserves are 21.84 million t, belonging to large boron deposits. Boron mafic iron ore resources are the main body of boron resources development and utilization in my country at present, but the grade is low (average B 2 O 3 : 7% to 8%), the mineral composition is complex, the crystallite size is fine and uneven, and it is difficult to select and smelt. At present, the processing process of boron mafic iron ore in my country is as follows: magnetic-recombination separation to obtain boron concentrate, iron concentrate and tailings, about 40% of B 2 O 3 I...

Claims

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Application Information

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Patent Type & Authority Patents(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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