CN-121972300-A - Ore dressing method for improving quality of flotation iron ore concentrate

Abstract

The invention discloses a beneficiation method for improving quality of flotation iron ore concentrate, which comprises the following steps of S1, taking magnetic concentrate obtained by three-stage grinding and three-stage magnetic separation of artificial magnetite as flotation ore feeding, S2, carrying out reverse flotation operation on the magnetic concentrate obtained by the treatment of the step S1, S3, carrying out concentration operation on the reverse flotation rough concentrate obtained by the treatment of the step S2, S4, merging reverse flotation primary tailings and scavenging I concentrate obtained by the treatment of the step S3, returning to the reverse flotation rough concentration operation of the step S2 to form closed cycle, carrying out reverse flotation II scavenging operation on scavenging I tailings, returning the scavenging II to the reverse flotation scavenging I to form closed cycle, carrying out reverse flotation III scavenging operation on scavenging II, forming cycle, carrying out reverse flotation IV scavenging operation on the scavenging III tailings, forming closed cycle, and taking the scavenging IV tailings as final tailings of the final reverse flotation primary and one-scavenging four scavenging processes.

Inventors

• WANG QIAN
• ZHANG LILI
• LI NING
• LIU SHENG
• LI JINGLUN
• WANG HONG
• HE YUE
• WANG HU
• FENG YIZHI

Assignees

• 酒泉钢铁(集团)有限责任公司

Dates

Publication Date

20260505

Application Date

20260402

Claims (7)

1. 1. The mineral separation method for improving the quality of the flotation iron ore concentrate is characterized by comprising the following steps of: S1, taking magnetic concentrate of artificial magnetite subjected to three-stage grinding and three-stage magnetic separation as flotation ore feeding, wherein the flotation ore feeding granularity is required to be basically controlled to be more than 90.0 percent in the content of minus 325 meshes; S2, performing reverse flotation operation on the magnetic concentrate obtained after the treatment in the step S1, firstly adding 300g/t of caustic starch as a pH regulator and an inhibitor in the roughing process, regulating the pH value of roughing pulp to 9-10, inhibiting iron minerals from floating up, and then adding 200g/t of a combined collector for separation to obtain reverse flotation rough concentrate and reverse flotation rough tailings; s3, carrying out concentration operation on the reverse flotation rough concentrate obtained after the treatment in the step S2, and adding 100g/t of combined collector in the concentration process to obtain reverse flotation primary tailings and reverse flotation iron concentrate; carrying out reverse flotation scavenging I on the rough tailings obtained after the treatment in the step S2 to obtain scavenging I concentrate and scavenging I tailings; S4, merging the primary reverse flotation tailings and the scavenging I concentrate obtained after the treatment in the step S3, returning to the reverse flotation roughing operation in the step S2 to form closed circulation, scavenging the scavenging I tailings to perform reverse flotation II scavenging operation, adding no reagent in the operation process, returning the scavenging II to the reverse flotation scavenging I to form closed circulation, scavenging the scavenging II to perform reverse flotation III scavenging operation, adding no reagent in the operation process, returning the scavenging III to the scavenging II to form closed circulation, scavenging III to perform reverse flotation IV scavenging operation, adding no reagent in the operation process, returning the scavenging IV to the scavenging III to form closed circulation, and taking the scavenging IV as the final tailings of the reverse flotation one-roughing one-scavenging four-scavenging process.
2. 2. The beneficiation method for improving the quality of the flotation iron ore concentrate according to claim 1, wherein the artificial magnetite in the step S1 is iron ore obtained by roasting, magnetizing and reducing refractory iron ore, and the ore concentrate product obtained by performing weak magnetic separation on the magnetite in the stage of grinding is subjected to an inverse flotation process to finally obtain the flotation iron ore concentrate.
3. 3. The beneficiation method for improving the quality of the flotation iron ore concentrate according to claim 1, wherein in the step S2, 300g/t of caustic starch is matched in the roughing process, the proportioning process is to add water into 0.5g of chemically pure sodium hydroxide and 5.0g of edible corn starch for heating and dissolving, then the mixture is placed into a 500mL volumetric flask for constant volume, the quality guarantee time is 15 days, and the mixture is used after heating in a water bath at 35 ℃.
4. 4. The beneficiation method for improving the quality of the iron ore concentrate according to claim 1, wherein in the step S2, the combined collector is used by mixing the collectors YG328B used in the production place and the special defoamer for THIX-598 flotation ores in a mass ratio of 2:3, and then diluting and heating the mixture to prepare a solution with a mass concentration of 1.0%.
5. 5. The beneficiation method for improving the quality of the flotation iron ore concentrate according to claim 4, wherein the collector YG328B is a cationic collector, and the components of the collector comprise etheramine, and the etheramine has the structural formula: 。
6. 6. The beneficiation method for improving the quality of the flotation iron ore concentrate according to claim 4, wherein the special defoamer for THIX-598 flotation ore comprises polyether with the following structural formula: 。
7. 7. The beneficiation method for improving the quality of the floated iron ore concentrate according to claim 1, wherein the concentration of ore pulp in the roughing process of the reverse flotation operation in the step S2 is 30%, and the temperature of the floated ore pulp is 30 ℃ plus or minus 5 ℃.

Description

Ore dressing method for improving quality of flotation iron ore concentrate Technical Field The invention relates to the technical field of mineral processing methods, in particular to a mineral separation method for improving the quality of flotation iron concentrate. Background The specularite belongs to typical complex refractory iron oxide ores, and raw ore has low iron grade, various iron mineral types, complex symbiotic relationship and extremely refractory ore. The existing specularite mountain refractory iron oxide ore adopts a roasting reduction-magnetic separation-reverse flotation process flow to obtain iron concentrate, the properties of raw ore are not stable any more along with the continuous deepening of mining depth, target minerals and gangue minerals are complex and changeable, main iron-containing minerals are specularite, siderite and limonite, and main gangue minerals are quartz, jade, muscovite, barite, dolomite and the like. Sulfur in the specularite mainly exists in the form of barite, the rest of sulfur-containing minerals are pyrite, and potassium mainly exists in the form of muscovite. In the current roasting-magnetic separation-flotation process, part of sulfur in barite is removed in SO 2 gas through roasting, the rest enters a magnetic separation-flotation process, white mica is used as a common gangue mineral and has close symbiotic relation with other silicate minerals (feldspar, quartz and the like), the white mica is difficult to decompose and remove in the roasting-magnetic separation stage, caustic starch adopted in the reverse flotation operation not only inhibits artificial magnetite, but also inhibits part of white mica from floating upwards, SO that the quality of final reverse flotation concentrate is poor, the potassium and sulfur content in the iron concentrate tends to increase, and a series of problems of blast furnace ironmaking yield, quality reduction, coke ratio increase, iron concentrate smelting value reduction and the like are caused when the content is too high. Disclosure of Invention Aiming at the technical problems, the invention provides a beneficiation method for improving the quality of flotation iron ore concentrate. In order to achieve the above purpose, the technical scheme of the invention is as follows: A mineral separation method for improving the quality of flotation iron ore concentrate comprises the following steps: S1, taking magnetic concentrate of artificial magnetite subjected to three-stage grinding and three-stage magnetic separation as flotation ore feeding, wherein the flotation ore feeding granularity is required to be basically controlled to be more than 90.0 percent in the content of minus 325 meshes; S2, performing reverse flotation operation on the magnetic concentrate obtained after the treatment in the step S1, firstly adding 300g/t of caustic starch as a pH regulator and an inhibitor in the roughing process, regulating the pH value of roughing pulp to 9-10, inhibiting iron minerals from floating up, and then adding 200g/t of a combined collector for separation to obtain reverse flotation rough concentrate and reverse flotation rough tailings; s3, carrying out concentration operation on the reverse flotation rough concentrate obtained after the treatment in the step S2, and adding 100g/t of combined collector in the concentration process to obtain reverse flotation primary tailings and reverse flotation iron concentrate; carrying out reverse flotation scavenging I on the rough tailings obtained after the treatment in the step S2 to obtain scavenging I concentrate and scavenging I tailings; S4, merging the primary reverse flotation tailings and the scavenging I concentrate obtained after the treatment in the step S3, returning to the reverse flotation roughing operation in the step S2 to form closed circulation, scavenging the scavenging I tailings to perform reverse flotation II scavenging operation, adding no reagent in the operation process, returning the scavenging II to the reverse flotation scavenging I to form closed circulation, scavenging the scavenging II to perform reverse flotation III scavenging operation, adding no reagent in the operation process, returning the scavenging III to the scavenging II to form closed circulation, scavenging III to perform reverse flotation IV scavenging operation, adding no reagent in the operation process, returning the scavenging IV to the scavenging III to form closed circulation, and taking the scavenging IV as the final tailings of the reverse flotation one-roughing one-scavenging four-scavenging process. Wherein the artificial magnetite in the step S1 is iron ore obtained by roasting, magnetizing and reducing refractory iron oxide ore, and the concentrate product obtained by carrying out weak magnetic separation on the magnetite in the stage of grinding is subjected to reverse flotation process to finally obtain the flotation iron concentrate. In the step S2, 300g/t of caustic s