Process for high pressure compaction of fluorite ball with sodium silicate as binder

A technology of sodium silicate and binder, applied in the direction of improving process efficiency, etc., can solve the problems of fluorite lump ore shortage, waste of resources, pollution of the environment, etc., and achieve the effects of low grade drop point, reduced usage, and high range

Active Publication Date: 2015-02-25
郴州德宇高新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fluorite ore for smelting generally requires a grade of CaF 2 However, limited by resources, medium and high-grade fluorite lumps are becoming more and more scarce, and the cost has risen sharply, while low-grade, high-FeO, MnO and other oxide fluorite raw lumps and powders are in abundance. , especially the low-grade high impurities produced by symbiosis with non-ferrous metal ore through beneficiation are rich in CaF 2 Tailings are piled up like a mountain, with no way out, wasting resources and polluting the environment. How to dispose of these wastes and propose an effective resource recovery method has become an issue of great concern to the society

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Fluorite flotation powder (mesh 100-300 mesh), fluorite ore powder (particle size ≤ 3mm, in the fluorite ore powder, the mass percentage of fluorite ore powder with a particle size of 1-3mm ≥ 70%), the sodium silicate solution is placed in a planetary wheel mill mixer and mixed evenly, and then the mixture is placed in a high-pressure briquetting machine (linear specific pressure: 7.5t / cm) to extrude into balls, and then the balls are baked , Bake at 150-220°C for 3.0h, then cool.

[0021] The concentration of the sodium silicate solution is 52°Bé, the modulus of the sodium silicate in the solution is 2.4, and the mass percentage of the sodium silicate solution in the mixed material is 5%.

[0022] Assuming that the mass sum of fluorite flotation powder and fluorite ore powder is 100%, the mass percentage of fluorite flotation powder is 90%, and the balance is fluorite ore powder.

[0023] In the fluorite flotation powder, CaF 2 The content of ≥88wt%, SiO 2 Content≤9...

Embodiment 2

[0026] Fluorite flotation powder (mesh 100-300 mesh), fluorite ore powder (particle size ≤ 3mm, in the fluorite ore powder, the mass percentage of fluorite ore powder with a particle size of 1-3mm ≥ 70%), the sodium silicate solution is placed in a planetary wheel mill mixer and mixed evenly, and then the mixture is placed in a high-pressure briquetting machine (linear specific pressure: 6t / cm) to extrude into balls, and then the balls are baked. Bake at 120-180°C for 3.0 hours, then cool.

[0027] The concentration of the sodium silicate solution is 52°Bé, the modulus of the sodium silicate in the solution is 2.4, and the mass percentage of the sodium silicate solution in the mixed material is 3.5%.

[0028] Based on the sum of the mass of fluorite flotation powder and fluorite ore powder as 100%, the mass percentage of fluorite ore powder is 70%, and the balance is fluorite flotation powder.

[0029] In the fluorite flotation powder, CaF 2 The content of ≥88wt%, SiO 2 Con...

Embodiment 3

[0032] Fluorite flotation powder (mesh 100-300 mesh), fluorite ore powder (particle size ≤ 3mm, in the fluorite ore powder, the mass percentage of fluorite ore powder with a particle size of 1-3mm ≥ 70%), the sodium silicate solution is placed in a planetary wheel mill mixer and mixed evenly, and then the mixture is placed in a high-pressure ball press (line specific pressure: 7.5t / cm) to press into balls, and then the balls are baked , Bake at 150-220°C for 3.0h, then cool.

[0033] The concentration of the sodium silicate solution is 45°Bé, the modulus of the sodium silicate in the solution is 2.8, and the mass percentage of the sodium silicate solution in the mixed material is 5.5%.

[0034] Assuming that the mass sum of fluorite flotation powder and fluorite ore powder is 100%, the mass percentage of fluorite flotation powder is 90%, and the balance is fluorite ore powder.

[0035] In the fluorite flotation powder, CaF 2 The content of ≥88wt%, SiO 2 Content≤9wt%, S cont...

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Abstract

The invention discloses a process for high pressure compaction of a fluorite ball with sodium silicate as a binder. The process comprises the following steps: uniformly mixing fluorite flotation powder, fluorite ore powder and a sodium silicate solution in a mixer; placing an obtained mixed material in a high pressure ball press machine for extrusion so as to obtain a ball; and roasting and cooling the ball. The fluorite ball obtained through high pressure compaction with sodium silicate as the binder has a high grade, a wide and high range (with the content of CaF2 in a range of 75 to 95 wt% and normally no less than 85 wt%), a reasonable reaction specific surface area and performances and mechanical strength satisfying requirements for a flux used in metal smelting. The fluorite ball provided by the invention can be extensively used in metal smelting in a blast furnace and for special steel, stainless steel (all the varieties), nonferrous metals and the like and enables a slugging speed to be accelerated and smelting time to be shortened; compared with a fluorite block, application amount of the fluorite ball is greatly reduced, and production cost and the quantity of discharged slag are reduced.

Description

technical field [0001] The invention relates to a process for high-pressure pressing fluorite balls using sodium silicate as a binding agent. Background technique [0002] Fluorite has the characteristics of lowering the melting point of refractory substances in the smelting process of special steel, stainless steel, ferroalloy, and nonferrous metals, promoting the flow of slag, and separating the slag and metal well. As a flux in the metal smelting process, it is widely used in desulfurization, dephosphorization, and enhancing the malleability and tensile strength of metals. Fluorite ore for smelting generally requires a grade of CaF 2 However, limited by resources, medium and high-grade fluorite lumps are becoming more and more scarce, and the cost has risen sharply, while low-grade, high-FeO, MnO and other oxide fluorite raw lumps and powders are in abundance. , especially the low-grade high impurities produced by symbiosis with non-ferrous metal ore through beneficiati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/076C22B1/243
CPCY02P10/20
Inventor 翁水生
Owner 郴州德宇高新材料有限公司
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