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A method for comprehensive utilization of boron mud

A boron mud and filtrate technology, applied in the directions of boron compounds, boron oxide compounds, chemical instruments and methods, etc., can solve the problems of inability to recover boron mud and magnesium, pollution of boron mud, failure to eliminate boron mud, etc., to reduce energy consumption, The effect of saving energy and realizing environmental benefits

Active Publication Date: 2021-07-20
DALIAN DEETOP ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] There are two main problems in the above process: 1) Most of the processes can only recover the active magnesium in the boron mud, and cannot recover all the magnesium in the boron mud; 2) It has not completely eliminated the boron mud and solved the problem of boron mud pollution

Method used

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  • A method for comprehensive utilization of boron mud

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Effect test

Embodiment 1

[0045] A method for comprehensive utilization of boron mud in the present embodiment comprises the following steps:

[0046] (1) Grinding the boron mud so that the proportion of 120-200 mesh boron mud is more than 95%, and the pretreated boron mud is obtained;

[0047] (2) Fully mix the pretreated boron mud and anhydrous magnesium chloride in step (1) according to the mass ratio of 1:1.6, place them in a suspension calciner for low-temperature calcining, the low-temperature calcining temperature is 550°C, and the calcining time is 30 minutes to obtain low-temperature calcining Boron mud;

[0048] (3) Perform magnetic separation on the boron slime calcined at low temperature in step (2), the magnetic field strength is 350 mT, the iron recovery rate is between 75%, and the boron slime after iron removal is obtained;

[0049] (4) The boron slime after iron removal in step (3) is subjected to high-temperature calcination in a suspension calcination furnace. The high-temperature c...

Embodiment 2

[0061] A method for comprehensive utilization of boron mud in the present embodiment comprises the following steps:

[0062] (1) Grinding the boron mud so that the proportion of 120-200 mesh boron mud is more than 95%, and the pretreated boron mud is obtained;

[0063] (2) Fully mix the pretreated boron mud and anhydrous magnesium chloride in step (1) according to the mass ratio of 1:1.7, place them in a suspension calciner for low-temperature calcining, the low-temperature calcining temperature is 650°C, and the calcining time is 20 minutes to obtain low-temperature calcining Boron mud;

[0064] (3) Perform magnetic separation on the boron slime calcined at low temperature in step (2), the magnetic field strength is 400mT, the iron recovery rate is between 80%, and the boron slime after iron removal is obtained;

[0065] (4) The boron slime after iron removal in step (3) is subjected to high-temperature calcination in a suspension calcination furnace. The high-temperature ca...

Embodiment 3

[0077] A method for comprehensive utilization of boron mud in the present embodiment comprises the following steps:

[0078] (1) Grinding the boron mud so that the proportion of 120-200 mesh boron mud is more than 95%, and the pretreated boron mud is obtained;

[0079] (2) Fully mix the pretreated boron mud and anhydrous magnesium chloride in step (1) according to the mass ratio of 1:1.8, place them in a suspension calciner for low-temperature calcining, the low-temperature calcining temperature is 700°C, and the calcining time is 10 minutes to obtain low-temperature calcining Boron mud;

[0080] (3) Perform magnetic separation on the boron slime calcined at low temperature in step (2), the magnetic field strength is 500mT, the iron recovery rate is between 85%, and the boron slime after iron removal is obtained;

[0081] (4) The boron slime after iron removal in step (3) is subjected to high-temperature calcination in a suspension calcination furnace. The high-temperature ca...

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Abstract

The invention provides a method for comprehensive utilization of boron slime, which specifically includes the following steps: 1) grinding; 2) adding anhydrous magnesium chloride to low-temperature calcining; 3) magnetic separation to remove iron; 4) boron slime after high-temperature calcining to remove iron; 5) Mixed reaction with ammonium salt solution; 6) Filtration, the filtrate is magnesium salt leaching solution, the filter residue contains boron, silicon, magnesium, a small amount of aluminum and iron, and the filter residue is treated: adding sodium carbonate and CO 2 Carry out leaching, filtration, acid hydrolysis, filtration, purification, and filtration to obtain coarse borax, silica, building material fillers, and magnesium salt leaching solution; 7) Add concentrated ammonia water and precipitation to the magnesium salt leaching solution obtained twice agent, react, precipitate, and filter to obtain magnesium hydroxide filter cake; 8) dry and calcinate magnesium hydroxide to obtain high-purity magnesium oxide. The process in the present invention can utilize boron mud to prepare high-purity magnesia, the recovery rate of magnesium is high, and the complete comprehensive utilization of boron mud has been realized, and the CO 2 recycling.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of solid waste, in particular to a method for comprehensive utilization of boron mud. Background technique [0002] Boron mud is the waste slag discharged after the production of borax by using boron magnesium (iron) ore in industry. About 4t~5t of boron mud is discharged per 1t of borax produced. At present, a large amount of boron mud is discharged every year in my country. Among them, Liaoyang, Yingkou and Dashi in Liaoning area The discharge of boron waste residue (boron mud) in Qiao, Dandong, Kuandian and other places accounts for more than 60% of the national discharge, with a daily discharge of up to 400m 3 ~600m 3 . Over the years, the discharged boron mud has piled up like a mountain, which not only occupies a large amount of land, but also alkalizes the soil near the stockyard and causes the migration and transformation of boron, causing environmental pollution. [0003] The ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/12C01F5/02C04B18/04C22B1/02B03C1/02
CPCB03C1/02C01B35/122C01F5/02C04B18/0481C22B1/02Y02W30/91Y02P10/20
Inventor 路畅马跃高飞
Owner DALIAN DEETOP ENVIRONMENTAL TECH CO LTD
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