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A test method for realizing single-step reverse flotation desiliconization and decalcification of magnesite
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A technology of reverse flotation desiliconization and test method, which is applied in the field of magnesite beneficiation and purification technology, can solve the problems of increasing the difficulty of flotation separation and weakening the strength of refractory materials, so as to simplify the flotation process and reagent system, and improve the economy and The effect of social value
Active Publication Date: 2021-11-30
FUZHOU UNIV
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Since dolomite and magnesite belong to carbonategangue minerals, they have the same molecular structure and similar chemical properties, the dissolution of magnesite and dolomite minerals in the flotation process leads to the dissolution of a large amount of magnesium and calcium ions into the pulp Among them, due to the similar physical and chemical properties of calcium and magnesium ions, it is easy to cause surface transformation of magnesiumcarbonate, calcium magnesium carbonate and calcium carbonate under certain conditions, which increases the difficulty of flotation separation.
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Embodiment 1
[0033] Step 1: Prepare the ore sample
[0034] Prepare magnesite, dolomite and quartz pure minerals, and mix the three minerals according to a certain ratio to prepare mixed ore; the particle size of the mixed ore is between -0.106+0.074mm; according to the mass ratio, the proportion of the mixed ore is magnesite Magnesium ore: dolomite: quartz=17:2:1;
[0035] Step 2: Blending
[0036] Put the mixed ore powder obtained in step 1 in a flotation device, add 45 mL of deionized water, mix evenly, and perform slurry adjustment to obtain magnesite slurry;
[0037] Step 3: Reverse flotation desiliconization and decalcification
[0038] At room temperature, first add a 3% NaOH aqueous solution to the magnesite slurry, adjust the pH value to 9, and stir for 3 minutes until the slurry is uniform to obtain a magnesite slurry with a pH value of 9;
[0039] In the magnesite pulp whose pH value is 9, add acetylacetone solution, its addition accounts for magnesite pulp amount is 6000mg / L...
Embodiment 2
[0042] Step 1: Prepare the ore sample
[0043] Prepare magnesite, dolomite and quartz pure minerals, and mix the three minerals according to a certain ratio to prepare mixed ore; the particle size of the mixed ore is between -0.106+0.074mm; according to the mass ratio, the proportion of the mixed ore is magnesite Magnesium ore: dolomite: quartz=17:2:1;
[0044] Step 2: Blending
[0045] Put the mixed ore powder obtained in step 1 in a flotation device, add 45 mL of deionized water, mix evenly, and perform slurry adjustment to obtain magnesite slurry;
[0046] Step 3: Reverse flotation desiliconization and decalcification
[0047] At room temperature, first add a 3% NaOH aqueous solution to the magnesite slurry, adjust the pH value to 10, and stir for 3 minutes until the slurry is uniform to obtain a magnesite slurry with a pH value of 10;
[0048] In the magnesite pulp whose pH value is 10, add acetylacetone solution, its addition accounts for the magnesite pulp amount is 6...
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Abstract
The invention provides a test method for realizing single-step reverse flotation desiliconization and decalcification of magnesite. The specific process of the test method: artificially blend magnesite, dolomite and quartz single minerals; place the artificially mixed ore in the flotation equipment, add deionized water for mixing and stirring, add NaOH or HCl to the slurry at room temperature, After adjusting the pH value to 9-10, add the adjusting agent acetylacetone solution to the pulp, stir, add the collector dodecylamine, stir evenly, and perform single-step reverse flotation to obtain low-silicon and low-calciummagnesite concentrate. The acetylacetone solution added has a difference in floatability for the three minerals of magnesite, dolomite and quartz. This method can remove silicon minerals and calcium minerals in magnesite, improve the quality of magnesite, and produce magnesite Single-step reverse flotation desiliconization and decalcification provide a new test method.
Description
technical field [0001] The invention relates to the technical field of magnesite beneficiation and purification technology, in particular to a test method for realizing single-step reverse flotation desiliconization and decalcification of magnesite. Background technique [0002] Magnesite is a carbonate mineral with industrial value. At present, with the continuous mining of high-grade magnesite every year, the reserves are getting less and less, while low-grade magnesite cannot be directly used as a raw material for calcining high-quality refractory materials. It is an inevitable direction for the development of magnesite resources to find a beneficiation and purification method suitable for low-grade magnesite through mineral processing technology, increase the content of MgO in the mineral, and reduce the content of impurities. The main factor restricting the development and utilization of low-grade (MgO<45%) magnesite is the high content of silicon-calcium impurities...
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