Improved method for extracting borax from blast furnace boron-rich slag through sodium modification

A boron-rich slag and blast furnace technology, which is applied in the directions of boron oxides and borates, can solve the problems of low boron leaching rate, low activity of boron-rich slag, and reduce the contact between calcium and minerals, so as to promote glass microcrystallization. , Improve the effect of sodiumization, improve the effect of leaching efficiency

Active Publication Date: 2022-04-12
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in the production process of producing boric acid by sulfuric acid method, the consumption of sulfuric acid is large, the slag after acidolysis is difficult to filter, and the equipment is seriously damaged; the carbon-alkaline method is used to produce borax by using blast furnace boron-rich slag as raw material, because the activity of boron-rich slag is not high, resulting in The leaching rate of boron in the preparation of borax is not high; in the process of producing borax in molten state sodiumization-pressurized water leaching, the blast furnace boron-rich slag reacts in the molten state, the temperature is too high, the operation is difficult, and the leaching rate of boron is high when the calcium content is high lower
[0004] CN108069434A discloses that the mixture of boron ore and calcium compound undergoes multi-stage countercurrent roasting reaction at 650-900 °C, and then mixes with activated carbon to decompose and extract boron. Although the roasting temperature is reduced, this scheme requires multi-stage countercurrent reaction. Complex, while increasing the use of activated carbon materials to use their own porous adsorption properties, reducing the contact between calcification and minerals, the degree of vitrification is high, easy to form insoluble substances, increasing the difficulty of water immersion, and the production cost is high
[0005] CN106431023A discloses that minerals are melted first, and then the activity of minerals is improved through slow cooling and rapid quenching, but the slow cooling process will form Suianite structure, which is not conducive to boron leaching
[0006] The inventor's previous patent CN202111523817.3 discloses that the leaching rate of boron is further improved after compounding inorganic sodium and organic sodium, but the activity of boron-rich slag is low (about 85%), which still restricts the leaching rate of borax, and needs to be separated Control the timing and temperature of adding sodium source, the process is slightly complicated, and the control process requires high requirements

Method used

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  • Improved method for extracting borax from blast furnace boron-rich slag through sodium modification
  • Improved method for extracting borax from blast furnace boron-rich slag through sodium modification
  • Improved method for extracting borax from blast furnace boron-rich slag through sodium modification

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Effect test

Embodiment 1

[0077] 1) High temperature pretreatment: 20g of blast furnace boron-rich slag was ball milled for 1h, and then mixed with 2gTiO 2 Mix the additives, melt and roast at 1450°C for 2 hours, and cool naturally to room temperature; the fineness of the blast furnace boron-rich slag after ball milling is ~74μm, and the sieve passing rate is 94%;

[0078] 2) Sodiumization: the resulting product was mixed with Na 2 CO 3 : Sodium formate is put into the pot mill and fully mixed according to the composite sodiumizing agent with a mass ratio of 4:1, and the dosage of the composite sodiumizing agent is controlled so that the mol ratio of Na in the composite sodiumizing agent and B in the boron-rich slag is 4 : 1; put the fully mixed material into a muffle furnace, heat up to 600° C., keep warm for 3 hours, and cool to room temperature naturally after the end to obtain sodium slag;

[0079] 3) Water immersion: Weigh 10g of sodium slag, put it into a flask, add deionized water, place the f...

Embodiment 2

[0082] 1) High temperature pretreatment: after ball milling 20g of blast furnace boron-rich slag for 1.5h, mix with 2gTiO 2 Mix the additives, melt and roast at 1500°C for 2 hours, and cool naturally to room temperature; the fineness of the blast furnace boron-rich slag after ball milling is ~74μm, and the sieve passing rate is 96%;

[0083] 2) Sodiumization: the resulting product was mixed with Na 2 CO 3 and sodium oxalate according to the mass ratio of 4:1, put into the tank mill and mix thoroughly, and control the dosage of the composite sodium agent so that the molar ratio of Na in the composite sodium agent to B in the boron-rich slag is 4:1; put the well-mixed material into a muffle furnace, heat up to 620°C for 2 hours, and cool naturally to room temperature to obtain sodium slag;

[0084] 3) Water immersion: Weigh 10g of sodium slag, put it into a flask, add deionized water, place the flask in a constant temperature water bath at 80°C for heating and water immersion,...

Embodiment 3

[0087] All the other steps are the same as in Example 1, the only difference is:

[0088] Na in step 2) 2 CO 3 Form a composite sodiumizing agent with sodium formate in a mass ratio of 7:3.

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Abstract

The invention discloses an improved method for extracting borax by sodium modification of blast furnace boron-rich slag, which comprises the following steps: 1) high-temperature pretreatment: crushing the blast furnace boron-rich slag, uniformly mixing with a TiO2 auxiliary agent, melting and roasting, and cooling to room temperature; the product obtained in the first step is mixed with a composite sodium modification agent, the temperature is increased to 600-800 DEG C, heat preservation is conducted for 1-4 h, natural cooling is conducted to the room temperature, sodium slag is obtained, and the composite sodium modification agent is composed of inorganic sodium salt and organic sodium salt; 3) water leaching: carrying out water leaching reflux on the sodium slag, and carrying out solid-liquid separation to obtain water leaching slag and leachate; and 4) crystallization: evaporating and concentrating the leachate, aging, crystallizing and separating to obtain borax. The boron-rich slag of the blast furnace is adopted as the raw material, the appropriate sodium modifying agent and the nucleation auxiliary agent are adopted for preparing the borax, the boron leaching rate is high, the quality of the borax meets the national standard, waste is turned into wealth, cyclic utilization is achieved, and industrial popularization can be achieved.

Description

technical field [0001] The invention relates to a method for utilizing boron-rich slag, in particular to an improved method for extracting borax by sodiumizing blast furnace boron-rich slag. Background technique [0002] China is one of the countries with relatively rich boron resources, but the boron industry started relatively late. It established its own boron industry after 1955. After 60 years of development, it has established a boron mining, boron ore selection, boron ore processing, and boron industry. A series of industrial systems such as fine chemical industry and new boron-containing material production. So far, the production capacity of borax and boric acid in China is about 600,000 t / a and 300,000 t / a respectively. However, with the continuous expansion of the use of boron, the demand for boron in my country continues to grow, which makes the contradiction between supply and demand increasingly prominent, and the dependence on foreign countries is increasing. ...

Claims

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Application Information

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IPC IPC(8): C01B35/12
Inventor李杰李晋彪
OwnerINNER MONGOLIA UNIV OF TECH