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Magnesite ore desilicication and decalcification method

A magnesite and ore technology, applied in solid separation, flotation, etc., can solve the problems affecting the sedimentation of ore pulp, poor chemical selectivity, and inability to recycle, etc., to reduce equipment costs and chemical costs, low equipment operating costs, and reduce labor The effect of dosage

Active Publication Date: 2015-03-11
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems in the reverse flotation first and then positive flotation process are as follows: the decalcification effect is poor; the magnesite is suppressed first and then floated, which affects its separation effect; The consumption is large, and the cost of mineral processing is high; the fatty acid collectors commonly used in positive flotation need to be heated to obtain good indicators; water glass needs to be added in positive flotation, which affects the settlement of ore pulp; there are many types of chemicals, and it is difficult to reuse mineral processing water; Poor reagent selectivity, poorly floatable minerals such as brucite in magnesium ore cannot be recovered, and the loss of magnesium ore resources is serious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The original ore of magnesite was obtained from Haicheng area, Liaoning Province, and it was known through laboratory tests that the grade of CaO was 0.97%, and the grade of MgO was 46.04%. The ore sample is ground by a ball mill, and the content of the grinding particle size -0.074mm reaches 74%. Flotation is carried out in the XFD type hanging tank flotation machine with a rough and two fine reverse flotation process, each time the flotation sample is 400g, the amount of water added is 600mL, and the amount of collector LKD is: the first rough dosage is 75g / t, The amount of the first essence is 50g / t, the amount of the second essence is 25g / t, and the total amount is 150g / t. Sodium hexametaphosphate and water glass are used as regulators, the dosage of sodium hexametaphosphate is 150g / t, and the dosage of water glass is 1500g / t. Control the flotation pH to 5.0-5.5, adjust the pulp concentration to 20%-30% after sorting, use concentrated hydrochloric acid to control t...

Embodiment 2

[0012] The ore sample is the same as the ore sample in Example 1, and the ore sample is ground by a ball mill, and the content of the grinding particle size-0.074mm reaches 74%. Add 400g of ore sample and 600mL of water to the flotation tank, and use dodecylamine as the collector. The dosage is: 75g / t for the first rough, 50g / t for the first fine, 25g / t for the second fine, and 150g / t in total , add water glass 1500g / t, sodium hexametaphosphate 150g / t, use hydrochloric acid to adjust the flotation pH=5.5, after the first rough, second refined and three-stage reverse flotation, the yield rate is 71.44%, the CaO grade is 0.77%, and the MgO The magnesite concentrate with a grade of 46.64% has a calcium removal rate of 20.62%. Then further carry out acid leaching, adjust the pulp concentration at 30%, control the pH value of the pulp at 1-2 with concentrated hydrochloric acid, rotate at 700r / min, pickle for 40min, dry and detect the product in the tank, the final yield is 70.15%,...

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PUM

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Abstract

The invention discloses a magnesite ore desilicication and decalcification method, which is used for dressing low-grade magnesite ore and improving the sorting effect. A magnesite ore one-time rough and two-time fine reverse flotation desilicication and acid leaching decalcification process is adopted; conventional amine chemicals are used as cation collectors, wherein the dosage for one-time reverse flotation is 75-100g / t, the dosage for the first time of fine reverse flotation is 50-70g / t and the dosage for the second time of fine reverse flotation is 25-30g / t, sodium hexametaphosphate and water glass are used as regulators, wherein the dosage of the hexametaphosphate is 150-200g / t and the dosage of the water glass is 1000-1500g / t; diluted hydrochloric acid is used for regulating pH to 5.0-5.5 and then flotation is conducted; after flotation, the concentration of ore pulp is regulated to 20-30 percent, concentrated hydrochloric acid is used for regulating pH, stirring is conducted at revolving speed of 600-700rpm and the ore pulp is leached by using acid for 40-60min. According to the feature of high content of silicon and calcium impurities in magnesite ore, after the content of silicon is reduced, the removal rate of high-calcium impurities can be remarkably improved.

Description

technical field [0001] The invention relates to a beneficiation method, in particular to a method for desiliconization and decalcification of magnesite ore. Background technique: [0002] The large amount of magnesite mining year by year has gradually reduced the high-grade and high-quality resources. Most of the current low-grade high-silicon and high-calcium magnesites cannot be directly used to produce refractory materials. Therefore, it is necessary to go through ore dressing, desiliconization and decalcification to improve the grade of magnesium to meet the production requirements. The main impurities in magnesite ore are silicates and carbonates (dolomite, calcite, etc.). Generally, reverse flotation is used to remove silicate gangue minerals, and a better desilication index can be obtained; forward flotation magnesite is used to remove carbonate gangue, but the decalcification effect is poor. Because most magnesites contain both silicate and carbonate gangue minera...

Claims

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Application Information

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IPC IPC(8): B03D1/014
Inventor 代淑娟于连涛李晓安王志有韩佳宏刘国振张孟邓立佳范明阳
Owner UNIV OF SCI & TECH LIAONING
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