Method for reduction treatment on high-silicon slag through alkali-saving roasting method

A roasting method and reduction technology, which is applied in the field of alkali-saving roasting method to reduce the amount of high-silicon waste residue, can solve the problems of heavy material burden, shorten roasting time, and large amount of recycled alkali, and achieve material burden Lightweight, easy to obtain, and less residue

Inactive Publication Date: 2020-11-10
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to further shorten the roasting time, Mou et al. proposed a method of introducing agitated sodium hydroxide alkali roasting during the alkali roasting process. While the roasting temperature was still maintained at 500-600 ° C, the roasting time was reduced to 20 minutes, which successfully reduced the Energy consumption, but the fly in the ointment is that the mass ratio of alkali ore is as high as 4.5:1, the amount of alkali recycled in the subsequent preparation of silicon products is large, and the material burden is heavy

Method used

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  • Method for reduction treatment on high-silicon slag through alkali-saving roasting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Use industrial caustic soda as alkali flux, weigh the alkali flux and high-silicon waste slag according to the mass ratio of industrial caustic soda to high-silicon waste slag as 1.4, 1.2, 1.8, 1.6, 1.7, 1.5, 2.0, and put them into the pre- In the mixer, pre-mix for 60s to make pre-mixed ore;

[0029] The mass fraction of silicon dioxide in the high-silicon waste residue is 65%;

[0030] Roasting at 500°C for 20 minutes to obtain roasted ore;

[0031] According to the order of groups 1 to 7, the premixed ore roasting temperature is controlled to 400°C, 300°C, 350°C, 500°C, 450°C, 600°C, 550°C respectively;

[0032] According to the order of groups 1 to 7, the premixed ore roasting time is controlled to 20, 10, 18, 33, 35, 24, 42 minutes;

[0033] After the roasting is completed, the roasted ore is added to 80°C hot water for leaching (the weight ratio of water and mineral is 5:1), and the obtained clear liquid and filter cake are filtered;

[0034] According to the o...

Embodiment 2

[0037] Use industrial caustic soda as alkali flux, weigh the alkali flux and high-silicon waste slag according to the mass ratio of industrial caustic soda to high-silicon waste slag as 1.2, 1.8, 1.4, 1.6, 1.5, 1.7, 2.0, and put them into the pre- In the mixer, pre-mix for 60s to make pre-mixed ore;

[0038] The mass fraction of silicon dioxide in the high-silicon waste residue is 70%;

[0039] Roasting at 500°C for 20 minutes to obtain roasted ore;

[0040] According to the order of groups 1 to 7, the premixed ore roasting temperature is controlled to 300°C, 400°C, 350°C, 450°C, 500°C, 600°C, 550°C respectively;

[0041] According to the order of groups 1 to 7, the premixed ore roasting time is controlled to 10, 20, 18, 24, 33, 35, 42 minutes;

[0042] After the roasting is completed, the roasted ore is added to 80°C hot water for leaching (the weight ratio of water and mineral is 5:1), and the obtained clear liquid and filter cake are filtered;

[0043] In the order of gr...

Embodiment 3

[0046] Use industrial caustic soda as alkali flux, weigh the alkali flux and high-silicon waste slag according to the mass ratio of industrial caustic soda to high-silicon waste slag at 1.8, 1.4, 1.5, 1.6, 1.7, 2.0, 1.2, and put them into pre- In the mixer, pre-mix for 60s to make pre-mixed ore;

[0047] The mass fraction of silicon dioxide in the high-silicon waste residue is 74%;

[0048] Roasting at 500°C for 20 minutes to obtain roasted ore;

[0049] According to the order of groups 1 to 7, the roasting temperature of the premixed ore is controlled to 450°C, 400°C, 350°C, 550°C, 300°C, 600°C, 500°C respectively;

[0050] According to the order of groups 1 to 7, the premixed ore roasting time is controlled to 35, 20, 18, 25, 13, 30, 45 minutes;

[0051]After the roasting is completed, the roasted ore is added to 80°C hot water for leaching (the weight ratio of water and mineral is 5:1), and the obtained clear liquid and filter cake are filtered;

[0052] In the order of ...

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Abstract

The invention discloses a method for reduction treatment on high-silicon slag through an alkali-saving roasting method. The method comprises the following steps that (1) the high-silicon slag is crushed and ground into fine ore; (2) a certain proportion of solid caustic soda flakes are added into the fine ore and uniformly mixed in a high-speed cutting crusher to obtain premixed ore; (3) a box-type muffle furnace is heated to a specified roasting temperature, a corundum crucible containing the premixed ore is placed into the box-type muffle furnace after the temperature is stable, the premixedore is heated to a constant roasting temperature after ten minutes, roasting timing is performed, the corundum crucible is taken out after roasting is finished, and air cooling is performed to obtainroasted ore; and (4) the roasted ore is fully dissolved in hot water, and then solid-liquid separation is performed to obtain a sodium silicate solution which is a precursor for preparing silicon compounds, such as white carbon black, molecular sieves, etc. The filtered slag contains iron-rich slag of various metals and can be used as a raw material for multi-metal integrated extraction. According to the method, the operation method is simple, the sources of the raw materials in use are wide, the application range of synthetic products is wide, no wastewater is generated in the whole process,the process is clean and efficient, and the method is novel and high in practicability.

Description

technical field [0001] The invention belongs to the technical field of industrial waste slag treatment, and in particular relates to a method for reducing the amount of high-silicon waste slag by an alkali-saving roasting method. Background technique [0002] High-silicon waste residues are solid industrial waste residues, which are currently mainly stockpiled, not only occupying a large amount of land, but also seriously polluting soil and groundwater. In order to completely solve the problem of high-silicon waste slag stockpiling, reduction treatment is the only way. Therefore, it is necessary to study the use of efficient and green comprehensive recycling methods of waste slag, which is the key to the reduction treatment of high-silicon waste slag. [0003] At present, the reduction treatment methods of high-silicon waste residue mainly include alkali leaching method and alkali roasting method. [0004] The alkaline leaching method requires that the silica in the high-si...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B1/02
CPCC22B1/02C22B7/04Y02P10/20
Inventor 刘海洋王广欣翟玉春相楠姚怀韩超朱雁风刘伟倪锋王维张清
Owner HENAN UNIV OF SCI & TECH
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