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Method for activating ludwigite

A technology of boron mafic ore and iron ore powder, applied in the field of inorganic chemical industry, can solve problems such as energy consumption and economic performance that need to be investigated, and achieve the effect of improving utilization value and enhancing magnetic properties

Inactive Publication Date: 2008-05-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] This method realizes the separation of boron and iron, but if TFe≤35% in the ore used, compared with the TFe content (TFe≥57%) of iron ore used in traditional blast furnace ironmaking, the energy consumption and economic performance still need to be investigated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The boronite used is the raw ore of a mine in Wengquangou. The main mineral composition is: biotite, serpentine, magnetite, boronite and boronite, etc., of which boronite is 31.67%, boronite is 8.06% %. Chemical composition is B 2 o 3 8.34% MgO2 7.05% TFe28.71%, the reactivity of boron ore (atmospheric pressure alkaline hydrolysis method) 39.33%, ore powder particle size 180 mesh (pass rate 95%)

[0027] Take 30g of the above mineral powder and place it in a 100ml crucible. Press Na 2 O: B 2 o 3 =1.4:1 ratio, adding commercially available Na 2 CO 3 5.3g and mix well. Place in a high-temperature furnace, heat to 950°C, and react for 3 hours. Let cool and remove. Grind the reaction mass to 160 mesh (pass rate 90%), transfer it all into the reaction kettle, add all the washing water, add water to 80ml, seal it, start stirring, heat up to 140°C, and leaching for 2 hours , cooled down to below 100°C, all the slurry was poured out and filtered, and the filter residu...

Embodiment 2

[0030] Mineral powder is the same as embodiment 1

[0031] Take 50g of mineral powder, press Na 2 O: B 2o 3 =1.3:1; add 8.3g Na 2 CO 3 After mixing, add a small amount of water to moisten it, press it into a cylinder with a diameter of 10 mm and a height of 10 mm, place the cylinder on a refractory tray, put it in a high-temperature furnace, heat to 900 ° C, and react for 4 hours. Drop to 50°C, take it out, grind the material finely, the particle size is 160 mesh, (through rate 90%), soak the sodium metaborate therein with hot water (the process is the same as in Example 1), after washing the filter residue, record the dry filter residue weight 49.3g, containing B 2 o 3 0.55%, B 2 o 3 The leaching rate is 93.5%. Na in the filtrate 2 O / B 2 o 3 = 1.02, pH = 13.1

Embodiment 3

[0033] Mineral powder used is the same as embodiment 1

[0034] Take 30g of mineral powder and press Na 2 O: B 2 o 3 =0.7:1 ratio, adding Na 2 CO 3 2.7g, mixed evenly, placed in a crucible, heated to 950°C, reacted for 4 hours, then leached with hot water according to the method of Example 1. The measured B in the filter residue 2 o 3 The content is 1.2%, the filter residue weighs 29.0g, the corresponding leaching rate is 86.09%, and the Na in the filtrate 2 O / B 2 o 3 = 0.51, pH = 9.2.

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PUM

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Abstract

The invention provides a method of activating ludwigite. Firstly, ludwigite powders and Na2CO3 are mixed evenly at a certain rate, wherein, the ludwigite powders have a particle size of 80 to 350 meshes, and contain7 to 18 percent of B2O3, 7 to 32 percent of TFe, and 22 to 44 percent of MgO. After activating reaction under high temperature, the B2O3 in the ludwigite is changed into a water-soluble boric acid sodium salt, with reactivity up to 90 to 96 percent; then, adding water into milled material, heating and leaching, a boric acid sodium salt solution is filtered out, finally sodium metaborate, borax, or the boric acid sodium salt can be obtained through vaporization-concentration, cooling, crystallization or carbonation. The invention is characterized in that the reactivity liveness of boron-iron ore containing the ludwigite can be increased from less than 60 percent to 90 to 96 percent; and the magnetic performance of the obtained filter cake can be increased by 10 to 90 percent compared with raw ore, thereby improving the utilization value of slag (boron mud).

Description

technical field [0001] The invention relates to the technology of producing borate sodium salt from boron iron ore in the field of inorganic chemical industry. Background technique [0002] The chemical formula of Ludwigite is [(Mg, Fe) 2 Fe(BO 3 )O 2 ], depending on the degree of substitution of Mg for Fe, B 2 o 3 The content is in the range of 13.48% to 17.83%. Due to its poor reactivity, it is even considered to have no reactivity, and has been treated as a "dead mine" for a long time. [0003] Since the 1990s, individual borax factories began to try out boron iron ore in the Wengquangou mining area to produce borax, and chose to contain B 2 o 3 High boronite, with the method of activating boronite, the reactivity of early boronite can reach 85%, or even 90%. In recent years, with the reduction of rich ore resources, the same activation roasting technology, the activity of boronite has been declining, and some boronites have an activity even lower than 60%. The r...

Claims

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Application Information

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IPC IPC(8): C01B35/12
Inventor 胡德生仲剑初刘宏伟
Owner DALIAN UNIV OF TECH
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