CN104399593A - Magnesite ore desilicication and decalcification method - Google Patents
Magnesite ore desilicication and decalcification method Download PDFInfo
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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
The present invention relates to beneficiation method, a kind of method of particularly magnesite ore desiliconization, decalcification.
Background technology:
Magnesite a large amount of exploitation year by year, makes high-grade high-quality resource reduce gradually.Current is low-grade high silicon high calcium magnesite mostly, can not be directly used in production refractory material.Therefore, have to pass through ore dressing and desiliconizing decalcification, the grade improving magnesium reaches production requirement.Major impurity in magnesite ore is silicate and carbonate (dolomite, calcite etc.).General reverse flotation removes silicates gangue mineral, and can obtain better desiliconization index; Direct flotation magnesite, to remove carbonate gangue, but decalcification effect is poor.Because most magnesite is simultaneously containing silicate and carbonate gangue mineral, be generally used alternatingly reverse flotation and direct flotation.After this first reverse flotation, direct flotation flow process existing problems are as follows: decalcification effect is poor; Magnesite is first pressed down and floats afterwards, affect its separating effect; But direct flotation floats magnesium ore deposit and belongs to much more floating few flow process, and collecting agent consumption is large, and beneficiation cost is high; Fatty acid collecting agent conventional in direct flotation need be heated, and could obtain index; Direct flotation need add waterglass, affects settling ore pulp; Medicament kind is many, ore dressing Water circulation difficulty; Medicament poor selectivity, in magnesium ore deposit, the mineral of shepardite Bulk flotation choosing difference cannot reclaim, and the loss of magnesium ore resources is serious.
Therefore, develop the Novel impurity-cleaning technique that a kind of cost is low, effective, easy to operate, to raising magnesite dressing level, improve magnesite resource utilization ratio significant.
Summary of the invention
The invention provides a kind of method of magnesite ore decalcification, for low-grade magnesite ore dressing, improve separating effect.
The invention provides a kind of method of magnesite ore desiliconization, decalcification, its solution is as follows:
Adopt that magnesite one is thick, acidleach deliming technique after two smart reverse flotation silica removals, with conventional amine medicament for cation-collecting agent, one thick consumption is 75 ~ 100g/t, one smart consumption is 50 ~ 70g/t, two smart consumption 25 ~ 30g/t, total consumption is 150 ~ 200g/t, with calgon and waterglass for adjusting agent, calgon consumption is 150 ~ 200g/t, waterglass consumption is 1000 ~ 1500g/t, with watery hydrochloric acid adjustment flotation pH for 5.0 ~ 5.5, carry out thick two smart single Counterfloatating desiliconizations, decalcification operation with this understanding; After flotation, adjustment pulp density to 20% ~ 30%, with concentrated hydrochloric acid control pH, is stabilized between 1 ~ 2, under flotation device revolution is 600 ~ 700r/min condition, and concentrated hydrochloric acid acid leaching ore pulp 40 ~ 60min.
The present invention is compared with existing similar technique, and its significant beneficial effect is embodied in: contain the high feature of silicium calcareous impurity level according to magnesite, after the content reducing silicon, can significantly improve the clearance of calcium impurities.And there is the advantages such as simple to operate, equipment operating cost is low.After flotation, add one section of corrosion-resistant groove operation of macerating, just the removal efficiency of calcium can be brought up to 50% ~ 60%.Compared with the single reverse flotation of routine, the removal efficiency of calcium improves 20% ~ 30%.Just combining compared with flotation flowsheet with trans-, decreasing equipment cost and reagent cost, simplify flow operations, decrease labo r usage.
Detailed description of the invention
Below by magnesite ore dressing experiment, in conjunction with the sorting index of contrast different minerals, by embodiment, the invention will be further described.
Embodiment 1
Obtain raw magnesite from area, Haicheng, know through chemical examination: CaO grade is 0.97%, MgO grade is 46.04%.Sample ore is through ball mill ore grinding, and grinding particle size-0.074mm content reaches 74%.Hang in groove type floatation cell in XFD type and carry out flotation, each flotation sample ore 400g with thick two smart reverse flotation flowsheets, amount of water is 600mL, and collecting agent LKD consumption is: a thick consumption 75g/t, a smart consumption 50g/t, two smart consumption 25g/t, amounts to 150g/t.With calgon and waterglass for adjusting agent, calgon consumption is 150g/t, and waterglass consumption is 1500g/t.Controlling flotation pH is 5.0 ~ 5.5, and sorting rear adjustment pulp density is 20% ~ 30%, with concentrated hydrochloric acid control pH between 1 ~ 2, dries detect after acidleach 40min to sample ore.Can to obtain productive rate be 70.53%, CaO grade 0.53%, MgO grade be 46.95% magnesite concentrate.The removal efficiency of calcium is 45.36%.The removal efficiency of calcium improves 23% compared with the single reverse flotation of routine.
Embodiment 2
Sample ore is with embodiment 1 sample ore, and sample ore is through ball mill ore grinding, and grinding particle size-0.074mm content reaches 74%.Add sample ore 400g in flotation cell, add water 600mL, take lauryl amine as collecting agent, consumption is: a thick consumption 75g/t, a smart consumption 50g/t, two smart consumption 25g/t, amount to consumption 150g/t, add waterglass 1500g/t, calgon 150g/t, flotation pH=5.5 is regulated with hydrochloric acid, after thick two essences three sections of reverse flotations, can obtain productive rate is 71.44%, CaO grade 0.77%, MgO grade is the magnesite concentrate of 46.64%, and the removal efficiency of calcium is 20.62%.Then carry out acidleach further, regulate pulp density 30%, control slurry pH with concentrated hydrochloric acid and be stabilized in 1 ~ 2, revolution 700r/min, acidleach 40min, dry product in groove and detect, finally can to obtain productive rate be 70.15%, CaO grade 0.58%, MgO grade be 46.85% magnesite concentrate.Compared with above-mentioned single reverse flotation, the removal efficiency of CaO improves 19.58%.On this basis, increase leaching time, sample ore, after thick two smart reverse flotations, regulates pulp density about 30%, controls slurry pH be stabilized in 1 ~ 2, revolution 700r/min, acidleach 60min with concentrated hydrochloric acid.The productive rate of final concentrate is 69.40%, CaO grade 0.53%, MgO grade is 46.85%.Now the removal efficiency of calcium is with up to 45.36%, and the removal efficiency of calcium is comparatively that the single reverse flotation of collecting agent improves 24.74% with lauryl amine.
Claims (1)
1. a method for magnesite ore desiliconization, decalcification, is characterized in that its solution of the method is as follows:
Adopt magnesite one thick, acidleach deliming technique after two smart reverse flotation silica removals, with conventional amine medicament for cation-collecting agent, one thick consumption is 75 ~ 100g/t, one smart consumption is 50 ~ 70g/t, two smart consumption 25 ~ 30g/t, total consumption is 150 ~ 200g/t, with calgon and waterglass for adjusting agent, calgon consumption is 150 ~ 200g/t, waterglass consumption is 1000 ~ 1500g/t, with watery hydrochloric acid adjustment flotation pH for 5.0 ~ 5.5, carry out thick two smart single Counterfloatating desiliconizations with this understanding, the operations such as decalcification, flotation concentrate is at pulp density to 20% ~ 30%, with concentrated hydrochloric acid control pH, be stabilized between 1 ~ 2, under flotation device agitation revolution is 600 ~ 700r/min condition, concentrated hydrochloric acid acid leaching ore pulp 40 ~ 60min.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104923383A (en) * | 2014-03-18 | 2015-09-23 | 沈阳铝镁设计研究院有限公司 | Dressing and grinding technology for low-grade magnesite |
| CN106345616A (en) * | 2016-11-28 | 2017-01-25 | 肃北镁科技耐火材料有限责任公司 | Flotation calcium-removing agent and method for magnesite |
| CN109847946A (en) * | 2018-12-28 | 2019-06-07 | 东北大学 | A kind of application of medicament in magnesite flotation decalcification |
| CN110639687A (en) * | 2019-10-21 | 2020-01-03 | 辽宁科技大学 | Thermal separation process of low-grade hydromagnesite ore |
| CN113731644A (en) * | 2021-09-01 | 2021-12-03 | 辽宁科技大学 | Impurity removal method of magnesite ore washing, friction screening and asynchronous reverse flotation |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101773868B (en) * | 2009-01-08 | 2012-11-28 | 鞍钢集团矿业公司 | Novel process for purifying magnesite |
| CN103212486B (en) * | 2013-05-06 | 2014-10-15 | 辽宁省地质矿产研究院 | Method for low-grade magnesite flotation |
| CN103272702B (en) * | 2013-06-08 | 2015-01-07 | 北京矿冶研究总院 | Flotation collector and method for obtaining high-grade magnesite concentrate from low-grade magnesite |
| CN103537380B (en) * | 2013-10-28 | 2015-10-21 | 辽宁科技大学 | A kind of reverse flotation |
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2014
- 2014-10-20 CN CN201410557562.6A patent/CN104399593B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104923383A (en) * | 2014-03-18 | 2015-09-23 | 沈阳铝镁设计研究院有限公司 | Dressing and grinding technology for low-grade magnesite |
| CN106345616A (en) * | 2016-11-28 | 2017-01-25 | 肃北镁科技耐火材料有限责任公司 | Flotation calcium-removing agent and method for magnesite |
| CN109847946A (en) * | 2018-12-28 | 2019-06-07 | 东北大学 | A kind of application of medicament in magnesite flotation decalcification |
| CN110639687A (en) * | 2019-10-21 | 2020-01-03 | 辽宁科技大学 | Thermal separation process of low-grade hydromagnesite ore |
| CN113731644A (en) * | 2021-09-01 | 2021-12-03 | 辽宁科技大学 | Impurity removal method of magnesite ore washing, friction screening and asynchronous reverse flotation |
| CN113731644B (en) * | 2021-09-01 | 2022-12-20 | 辽宁科技大学 | Impurity removal method of magnesite ore washing, friction screening and asynchronous reverse flotation |
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