WO2020133557A1 - 一种药剂在菱镁矿浮选脱钙中的应用 - Google Patents

一种药剂在菱镁矿浮选脱钙中的应用 Download PDF

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WO2020133557A1
WO2020133557A1 PCT/CN2019/070183 CN2019070183W WO2020133557A1 WO 2020133557 A1 WO2020133557 A1 WO 2020133557A1 CN 2019070183 W CN2019070183 W CN 2019070183W WO 2020133557 A1 WO2020133557 A1 WO 2020133557A1
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magnesite
flotation
decalcification
calcium
slurry
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印万忠
孙浩然
唐远
姚金
杨斌
韩会丽
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Northeastern University China
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B1/00Conditioning for facilitating separation by altering physical properties of the matter to be treated
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B1/00Conditioning for facilitating separation by altering physical properties of the matter to be treated
    • B03B1/04Conditioning for facilitating separation by altering physical properties of the matter to be treated by additives
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03DFLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00Flotation
    • B03D1/001Flotation agents
    • B03D1/002Inorganic compounds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03DFLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00Flotation
    • B03D1/001Flotation agents
    • B03D1/004Organic compounds
    • B03D1/01Organic compounds containing nitrogen

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  • the invention relates to the technical field of beneficiation and purification process of magnesite, in particular to the application of a medicament in the decalcification of magnesite flotation.
  • CaO in magnesite is mainly contained in impurity mineral dolomite (CaMg(CO 3 ) 2 ).
  • dolomite and magnesite are carbonate gangue minerals, they have the same molecular structure and similar chemical properties. In addition, some minerals have a finer grain size.
  • the magnesite and dolomite minerals Dissolution causes a large amount of magnesium and calcium ions to dissolve into the slurry.
  • the purpose of the present invention is to provide an application of the agent in the decalcification of magnesite flotation.
  • the inhibitor BAPTA is added, and according to different inhibitors BAPTA (1,2 ⁇
  • BAPTA 1,2 ⁇
  • the removal of calcium minerals in the ore improves the quality of magnesite and provides new agents for the decalcification of high-calcium and low-grade magnesite beneficiation.
  • the application of a medicament of the invention in the decalcification of magnesite flotation is the use of the inhibitor BAPTA in the process of decalcification of magnesite flotation.
  • the application of the agent in the flotation and decalcification of magnesite is to use the inhibitor BAPTA in the sizing process in the flotation and decalcification process of magnesite, thereby preparing magnesite ore pulp.
  • the application of the agent in the demineralization of magnesite flotation is to dissolve the inhibitor BAPTA in dimethyl sulfoxide and formulate the inhibitor BAPTA dimethyl at a molar concentration of 1.25 to 3.25 g/L Sulfoxide solution.
  • the agent is used in the decalcification process of magnesite flotation, and specifically includes the following steps:
  • the high-calcium low-grade magnesite is crushed and ball milled to obtain magnesite powder; among them, the quality of magnesite powder with a particle size of ⁇ 74 ⁇ m accounts for 70-90% of the total magnesite powder;
  • magnesite powder Place magnesite powder in the flotation equipment, add deionized water and inhibitor BAPTA dimethyl sulfoxide solution, mix well, and adjust the slurry to obtain magnesite slurry; of which, magnesite slurry
  • Step 3 Decalcification by positive flotation
  • collector sodium oleate is added, stirred well, and then subjected to positive flotation coarse separation to obtain a low-calcium magnesite concentrate;
  • Collector sodium oleate in the aqueous solution of sodium oleate collector: magnesite pulp (100-140) mg: 1L.
  • the main component and each component of the high-calcium low-grade magnesite in weight percentage are MgO 25-25.5%, CaO 18-25%, and SiO 2 0-0.5%.
  • the flotation equipment is preferably a hanging tank flotation machine with a rotation speed of 1600-1900rpm.
  • the amount of the inhibitor BAPTA accounts for 40 mg/L of magnesite pulp.
  • the NaOH is preferably a NaOH aqueous solution with a mass fraction of 1 to 5%.
  • the stirring is uniform, the stirring rate is 1600 to 1900 rpm, and the stirring time is 2 to 5 min.
  • the pH value is preferably 11.
  • the rotation speed of the positive flotation device is 1600 to 1900 rpm, preferably 1800 rpm, and the positive flotation time is preferably 3 to 5 min.
  • the collector sodium oleate is preferably a sodium oleate aqueous solution with a molar concentration of 0.01-0.05mol/L.
  • the amount of the collector sodium oleate accounts for 120 mg/L of magnesite slurry.
  • the main components of the low-calcium magnesite concentrate and each component are MgO 47.5% to 48.5% by weight, SiO 2 ⁇ 0.3%, and CaO ⁇ 0.6%.
  • the agent of the present invention is used in the flotation decalcification process of magnesite.
  • the recovery rate of low calcium magnesite concentrate is 70-85% by weight, and the recovery rate of MgO in low calcium magnesite concentrate is by weight percentage. 65 to 75%.
  • the present invention develops the use of a new inhibitor BAPTA. Because the new inhibitor BAPTA has a strong inhibitory effect on the selection of calcium-containing minerals, it shortens and simplifies the flotation decalcification process, making the flotation process run more smoothly and operate It is simpler and the new inhibitor BAPTA is more environmentally friendly than other chemical inhibitors. Eventually, magnesite concentrate with MgO grade greater than 47% and recovery rate of 65-85% can be obtained.
  • the method of the present invention has low ore grade and high CaO content in the raw ore; the magnesite concentrate obtained can reach the metallurgical industry special grade standard (YB321 ⁇ 81), that is, MgO ⁇ 47.00 %, SiO 2 ⁇ 0.30%, CaO ⁇ 0.8%.
  • the inhibitor BAPTA (1,2 ⁇ bis(o-aminophenoxy)ethane ⁇ N,N,N′,N′ ⁇ tetraacetic acid) of the invention is a chelating agent with extremely strong calcium selectivity, biologically It is mainly used for the monitoring of intracellular calcium ions. Since BAPTA can form a hydrophilic chelate with calcium ions, it is used as an inhibitor of dolomite in the decalcification process of magnesite, so that the inhibitor BAPTA The effects of magnesia and dolomite flotation are different, and it provides a new inhibitor for the decalcification of low-grade magnesite.
  • FIG. 1 is a schematic process flow diagram of the application of the agent of Example 1 of the present invention in magnesite flotation decalcification.
  • the high-calcium low-grade magnesite used is Shuidonggou magnesite in Kuandian, Liaoning.
  • the elemental composition of the high-calcium low-grade magnesite was analyzed by X-ray fluorescence spectrometry. The weight percentage is: MgO is 33.58%, SiO 2 0.27%, CaO is 15.17%, the balance is CO 2 and inevitable impurities; the XRD chart is shown in FIG. 2.
  • the inhibitor BAPTA used is analytically pure, the collector sodium oleate is chemically pure, and the pH adjuster sodium hydroxide is analytically pure.
  • the BAPTA agent used in the test was dissolved in dimethyl sulfoxide, and the rest of the reagents were prepared in deionized water to prepare aqueous solutions of corresponding concentrations for use.
  • the high-calcium and low-grade magnesite raw materials are crushed and ball-milled to obtain magnesite powder; among them, the quality of magnesite powder with a particle size of less than 74 ⁇ m accounts for 70% of the total magnesite powder quality ;
  • Step 3 Decalcification by positive flotation
  • the application of a medicament in the decalcification of magnesite flotation includes the following steps:
  • the high-calcium and low-grade magnesite raw materials are crushed and ball milled to obtain magnesite powder; among them, the quality of magnesite powder with a particle size of less than 74 ⁇ m accounts for 80% of the total magnesite powder quality ;
  • Step 3 Decalcification by positive flotation
  • the main component of the low calcium magnesite concentrate percentage by weight of MgO, 48.13%, SiO 2 of 0.14%, CaO was 0.61%; low calcium magnesite concentrate the MgO raw material accounted for total MgO 70.5% of the weight.
  • the application of a medicament in the decalcification of magnesite flotation includes the following steps:
  • the high-calcium and low-grade magnesite raw materials are crushed and ball milled to obtain magnesite powder; among them, the quality of magnesite powder with a particle size of less than 74 ⁇ m accounts for 80% of the total magnesite powder quality ;
  • Step 3 Decalcification by positive flotation
  • the application of a medicament in the decalcification of magnesite flotation includes the following steps:
  • the high-calcium and low-grade magnesite raw materials are crushed and ball milled to obtain magnesite powder; among them, the quality of magnesite powder with a particle size of less than 74 ⁇ m accounts for 90% of the total magnesite powder quality ;
  • Step 3 Decalcification by positive flotation
  • the main components of the concentrate are 48.23% MgO, 0.21% SiO 2 and 0.47% CaO.
  • the MgO in the low-calcium magnesite concentrate accounts for 69.25% of the total weight of MgO in the raw material.
  • the main components of the concentrate are 48.61% MgO, 0.21% SiO 2 and 0.27% CaO.
  • the MgO in the low-calcium magnesite concentrate accounts for 76.26% of the total weight of MgO in the raw material.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

一种药剂在菱镁矿浮选脱钙中的应用,将抑制剂BAPTA用于菱镁矿浮选脱钙工艺,具体将高钙低品位菱镁矿破碎,球磨,得到菱镁矿粉;将菱镁矿粉置于浮选设备中,加入去离子水和抑制剂BAPTA二甲基亚砜溶液,并混合均匀,进行调浆,室温下,向菱镁矿矿浆中加入NaOH,调节pH值至10~12后,加入捕收剂油酸钠,搅拌均匀,然后进行正浮选粗选,得到低钙菱镁矿精矿。加入的抑制剂BAPTA对菱镁矿及菱镁矿中杂质矿物白云石存在的可浮性差异,将菱镁矿中的钙矿物脱除,提高菱镁矿品质,为高钙低品位菱镁矿选矿脱钙提供新的药剂。

Description

一种药剂在菱镁矿浮选脱钙中的应用 技术领域
本发明涉及菱镁矿选矿提纯工艺技术领域,具体涉及一种药剂在菱镁矿浮选脱钙中的应用。
背景技术
在菱镁矿选矿提纯过程中,降低CaO含量是提高菱镁矿品质的关键。菱镁矿中的CaO主要包为在杂质矿物白云石(CaMg(CO 3) 2)中。但由于白云石与菱镁矿均属于碳酸盐类脉石矿物,有相同的分子结构和相似的化学性质,另外有些矿物嵌布粒度较细,在浮选过程中菱镁矿和白云石矿物的溶解导致大量镁、钙离子溶解到矿浆中,由于钙镁离子物理化学性质相近,在一定条件下容易使碳酸镁、碳酸钙镁及碳酸钙等发生表面转化,使菱镁矿和白云石表面性质趋同,增加浮选分离难度。因此,发现一种对钙离子选择性强的螯合剂用于消除菱镁矿浮选过程中钙离子的影响是势在必行的。
发明内容
本发明的目的是提供一种药剂在菱镁矿浮选脱钙中的应用,是在菱镁矿浮选脱钙过程中,加入抑制剂BAPTA,并根据在不同抑制剂BAPTA(1,2~双(邻氨基苯氧基)乙烷~N,N,N',N'~四乙酸)的用量下,菱镁矿及菱镁矿中杂质矿物白云石存在的可浮性差异,将菱镁矿中的钙矿物脱除,提高菱镁矿品质,为高钙低品位菱镁矿选矿脱钙提供新的药剂。
本发明的一种药剂在菱镁矿浮选脱钙中的应用,为将抑制剂BAPTA用于菱镁矿浮选脱钙工艺。
进一步的,所述的药剂在菱镁矿浮选脱钙中的应用,是将抑制剂BAPTA用于菱镁矿浮选脱钙工艺中的调浆过程,从而制备得到菱镁矿矿浆。
进一步的,所述的药剂在菱镁矿浮选脱钙中的应用,为将抑制剂BAPTA溶于二甲基亚砜中,配制成摩尔浓度为1.25~3.25g/L的抑制剂BAPTA二甲基亚砜溶液使用。
所述的药剂用于菱镁矿浮选脱钙工艺,具体包括以下步骤:
步骤1:磨矿
将高钙低品位菱镁矿破碎,球磨,得到菱镁矿粉;其中,菱镁矿粉中,粒级<74μm的菱镁矿粉的质量占总菱镁矿粉质量的70~90%;
步骤2:调浆
将菱镁矿粉置于浮选设备中,加入去离子水和抑制剂BAPTA二甲基亚砜溶液,并混合 均匀,进行调浆,得到菱镁矿矿浆;其中,菱镁矿矿浆中,菱镁矿粉的质量浓度为20~40%;抑制剂BAPTA二甲基亚砜溶液的摩尔浓度为1.25~3.25g/L;按固液比,抑制剂BAPTA:菱镁矿矿浆=(30~60)mg:1L;
步骤3:正浮选脱钙
室温下,向菱镁矿矿浆中加入NaOH,调节pH值至10~12后,搅拌均匀,得到pH值为10~12的菱镁矿矿浆;
向pH值为10~12的菱镁矿矿浆中,加入捕收剂油酸钠,搅拌均匀,然后进行正浮选粗选,得到低钙菱镁矿精矿;其中,按固液比,捕收剂油酸钠水溶液中捕收剂油酸钠:菱镁矿矿浆=(100~140)mg:1L。
所述的步骤1中,所述的高钙低品位菱镁矿其主要成分及各个成分按重量百分比为MgO为25~35.5%,CaO为18~25%,SiO 2为0~0.5%。
所述的步骤2中,所述的浮选设备优选为挂槽式浮选机,转速为1600~1900rpm。
所述的步骤2中,所述的抑制剂BAPTA的用量占菱镁矿矿浆量优选为40mg/L。
所述的步骤3中,所述的NaOH优选为质量分数为1~5%的NaOH水溶液。
所述的步骤3中,所述的搅拌均匀,搅拌速率为1600~1900rpm,搅拌时间为2~5min。
所述的步骤3中,所述的pH值优选为11。
所述的步骤3中,所述的正浮选粗选,正浮选设备的转速为1600~1900rpm,优选为1800rpm,正浮选时间优选为3~5min。
所述的步骤3中,所述的捕收剂油酸钠优选为摩尔浓度为0.01~0.05mol/L的油酸钠水溶液。
所述的步骤3中,所述的捕收剂油酸钠用量占菱镁矿矿浆量优选为120mg/L。
所述的步骤3中,在加入捕收剂油酸钠后,再加入起泡剂,搅拌均匀,最后进行正浮选粗选,所述的起泡剂优选为2号油,按固液比,2号油:菱镁矿矿浆=(4~6)mg:1L。
所述的步骤3中,所述的低钙菱镁矿精矿主要成分及各个成分按重量百分比为MgO47.5~48.5%,SiO 2≤0.3%,CaO≤0.6%。
本发明的药剂用于菱镁矿浮选脱钙工艺中,低钙菱镁矿精矿的回收率按重量百分比为70~85%,低钙菱镁矿精矿中的MgO回收率按重量百分比为65~75%。
本发明的一种药剂在菱镁矿浮选脱钙中的应用,相比于现有技术,其有益效果在于:
1、本发明开发了新的抑制剂BAPTA的使用,由于新的抑制剂BAPTA的对含钙矿物的选择抑制性强,从而缩短简化了浮选脱钙流程,使浮选过程运行更加平稳,操作更加简便,并且新型抑制剂BAPTA相对于其他化学抑制剂更具有环保性。最终可获得MgO品位大于 47%,回收率65~85%的菱镁矿精矿。
2、本发明的方法与现有技术相比,所处理的矿石品位低,原矿中CaO的含量高;获得的菱镁矿精矿可达到冶金工业特级标准(YB321~81),即MgO≥47.00%、SiO 2≤0.30%、CaO≤0.8%。
3、本发明的抑制剂BAPTA(1,2~双(邻氨基苯氧基)乙烷~N,N,N',N'~四乙酸)一种钙选择性极强的螯合剂,生物上主要用于细胞内钙离子的监控,由于BAPTA可以和钙离子生成亲水性螯合物,因此,将其作为菱镁矿浮选脱钙过程中白云石的抑制剂,使得抑制剂BAPTA对菱镁矿和白云石浮选的影响不同,为低品位菱镁矿选矿脱钙提供了一种新的抑制药剂。
附图说明
图1为本发明实施例1的药剂在菱镁矿浮选脱钙中的应用中,其工艺流程示意图。
图2为本发明的原料菱镁矿的XRD图。
具体实施方式
下面结合实施例对本发明作进一步的详细说明。
以下实施例中,所用的高钙低品位菱镁矿为辽宁宽甸水洞沟菱镁矿,采用X射线荧光光谱分析仪器对高钙低品位菱镁矿的元素成分进行分析,其主要成分按重量百分比为:MgO为33.58%,SiO 20.27%,CaO为15.17%,余量为CO 2和不可避免的杂质;其XRD图见图2。所用抑制剂BAPTA为分析纯,捕收剂油酸钠为化学纯,pH值调整剂氢氧化钠为分析纯。试验中所用的BAPTA药剂用二甲基亚砜进行溶解配置,其余试剂均用去离子水配制成相应浓度的水溶液备用。
实施例1
一种药剂在菱镁矿浮选脱钙中的应用,其工艺流程示意图见图1,包括以下步骤:
步骤1:磨矿
将高钙低品位菱镁矿原料进行破碎,球磨,得到菱镁矿粉;其中,菱镁矿粉中,粒级为小于74μm的菱镁矿粉的质量占总菱镁矿粉质量的70%;
步骤2:调浆
将粒级为小于74μm且占总菱镁矿粉质量的70%的菱镁矿粉置于挂槽式浮选机中,加入去离子水和抑制剂BAPTA二甲基亚砜溶液,其中,按固液比,抑制剂BAPTA:菱镁矿矿浆=30mg:1L,并混合均匀,进行调浆,得到菱镁矿矿浆;其中,菱镁矿矿浆中菱镁矿的质量浓度为20%;抑制剂BAPTA二甲基亚砜溶液的摩尔浓度为1.25g/L;
步骤3:正浮选脱钙
室温下,首先向菱镁矿矿浆加入质量分数为3%的NaOH水溶液,调节pH值至11后, 搅拌2min,至矿浆均匀,得到pH值为11的菱镁矿矿浆;
向pH值为11的菱镁矿矿浆中,先加入摩尔浓度为0.05mol/L的捕收剂油酸钠水溶液,其中,油酸钠加入量占菱镁矿矿浆量为100mg/L,搅拌2min,然后加入起泡剂2号油,2号油加入量占菱镁矿矿浆量为5mg/L,搅拌2min,最后进行3min正浮选粗选,得到低钙菱镁矿精矿。试验过程中,设定浮选机转速1800r/min。
本实施例中,低钙菱镁矿精矿的主要成分按重量百分比为MgO为47.23%,SiO 2为0.25%,CaO为0.59%;低钙菱镁矿精矿中的MgO占原料中MgO总重量的66.25%。
实施例2
一种药剂在菱镁矿浮选脱钙中的应用,包括以下步骤:
步骤1:磨矿
将高钙低品位菱镁矿原料进行破碎,球磨,得到菱镁矿粉;其中,菱镁矿粉中,粒级为小于74μm的菱镁矿粉的质量占总菱镁矿粉质量的80%;
步骤2:调浆
将粒级为小于74μm且占总菱镁矿粉质量的80%的菱镁矿粉置于挂槽式浮选机中,加入去离子水和抑制剂BAPTA二甲基亚砜溶液,其中,按固液比,抑制剂BAPTA:菱镁矿矿浆=40mg:1L,并混合均匀,进行调浆,得到菱镁矿矿浆;其中,菱镁矿矿浆中菱镁矿的质量浓度为25%;抑制剂BAPTA二甲基亚砜溶液的摩尔浓度为3.25g/L;
步骤3:正浮选脱钙
室温下,首先向菱镁矿矿浆加入质量分数为3%的NaOH水溶液,调节pH值至12后,搅拌2min,至矿浆均匀,得到pH值为12的菱镁矿矿浆;
向pH值为12的菱镁矿矿浆中,先加入摩尔浓度为0.06mol/L的捕收剂油酸钠水溶液,其中,油酸钠加入量占菱镁矿矿浆量为110mg/L,搅拌2min,然后加入起泡剂2号油,2号油加入量占菱镁矿矿浆量为6mg/L,搅拌2min,最后进行3min正浮选粗选,得到低钙菱镁矿精矿。试验过程中,设定浮选机转速1700r/min。
本实施例中,低钙菱镁矿精矿的主要成分按重量百分比为MgO为48.13%,SiO 2为0.14%,CaO为0.61%;低钙菱镁矿精矿中的MgO占原料中MgO总重量的70.25%。
实施例3
一种药剂在菱镁矿浮选脱钙中的应用,包括以下步骤:
步骤1:磨矿
将高钙低品位菱镁矿原料进行破碎,球磨,得到菱镁矿粉;其中,菱镁矿粉中,粒级为小于74μm的菱镁矿粉的质量占总菱镁矿粉质量的80%;
步骤2:调浆
将粒级为小于74μm且占总菱镁矿粉质量的80%的菱镁矿粉置于挂槽式浮选机中,加入去离子水和抑制剂BAPTA二甲基亚砜溶液,其中,按固液比,抑制剂BAPTA:菱镁矿矿浆=50mg:1L,并混合均匀,进行调浆,得到菱镁矿矿浆;其中,菱镁矿矿浆中菱镁矿的质量浓度为30%;抑制剂BAPTA二甲基亚砜溶液的摩尔浓度为2.5g/L;
步骤3:正浮选脱钙
室温下,首先向菱镁矿矿浆加入质量分数为4%的NaOH水溶液,调节pH值至10后,搅拌2min,至矿浆均匀,得到pH值为10的菱镁矿矿浆;
向pH值为10的菱镁矿矿浆中,先加入摩尔浓度为0.06mol/L的捕收剂油酸钠水溶液,其中,油酸钠加入量占菱镁矿矿浆量为120mg/L,搅拌2min,然后加入起泡剂2号油,2号油加入量占菱镁矿矿浆量为4mg/L,搅拌2min,最后进行3min正浮选粗选,得到低钙菱镁矿精矿。试验过程中,设定浮选机转速1600r/min。
本实施例中,低钙菱镁矿精矿的主要成分按重量百分比为MgO为47.73%,SiO 2为0.22%,CaO为0.19%;低钙菱镁矿精矿中的MgO占原料中MgO总重量的61.25%。
实施例4
一种药剂在菱镁矿浮选脱钙中的应用,包括以下步骤:
步骤1:磨矿
将高钙低品位菱镁矿原料进行破碎,球磨,得到菱镁矿粉;其中,菱镁矿粉中,粒级为小于74μm的菱镁矿粉的质量占总菱镁矿粉质量的90%;
步骤2:调浆
将粒级为小于74μm且占总菱镁矿粉质量的90%的菱镁矿粉置于挂槽式浮选机中,加入去离子水和抑制剂BAPTA二甲基亚砜溶液,其中,按固液比,抑制剂BAPTA:菱镁矿矿浆=60mg:1L,并混合均匀,进行调浆,得到菱镁矿矿浆;其中,菱镁矿矿浆中菱镁矿的质量浓度为35%;抑制剂BAPTA二甲基亚砜溶液的摩尔浓度为2.0g/L;
步骤3:正浮选脱钙
室温下,首先向菱镁矿矿浆加入质量分数为3%的NaOH水溶液,调节pH值至11后,搅拌2min,至矿浆均匀,得到pH值为11的菱镁矿矿浆;
向pH值为11的菱镁矿矿浆中,先加入摩尔浓度为0.05mol/L的捕收剂油酸钠水溶液,其中,油酸钠加入量占菱镁矿矿浆量为130mg/L,搅拌2min,然后加入起泡剂2号油,2号油加入量占菱镁矿矿浆量为4mg/L,搅拌2min,最后进行3min正浮选粗选,得到低钙菱镁矿精矿。试验过程中,设定浮选机转速1900r/min。
本实施例中,低钙菱镁矿精矿的主要成分按重量百分比为MgO为48.05%,SiO 2为0.25%,CaO为0.39%;低钙菱镁矿精矿中的MgO占原料中MgO总重量的73.69%。
实施例5
一种药剂在菱镁矿浮选脱钙中的应用,同实施例1,不同之处在于,按固液比,抑制剂BAPTA:菱镁矿矿浆=40mg:1L,得到的低钙菱镁矿精矿的主要成分按重量百分比为MgO为47.23%,SiO 2为0.13%,CaO为0.59%;低钙菱镁矿精矿中的MgO占原料中MgO总重量的68.15%。
实施例6
一种药剂在菱镁矿浮选脱钙中的应用,同实施例1,不同之处在于,按固液比,抑制剂BAPTA:菱镁矿矿浆=50mg:1L,得到的低钙菱镁矿精矿的主要成分按重量百分比为MgO为48.23%,SiO 2为0.21%,CaO为0.47%;低钙菱镁矿精矿中的MgO占原料中MgO总重量的69.25%。
实施例7
一种药剂在菱镁矿浮选脱钙中的应用,同实施例1,不同之处在于,按固液比,抑制剂BAPTA:菱镁矿矿浆=60mg:1L,得到的低钙菱镁矿精矿的主要成分按重量百分比为MgO为48.61%,SiO 2为0.21%,CaO为0.27%;低钙菱镁矿精矿中的MgO占原料中MgO总重量的76.26%。

Claims (10)

  1. 一种药剂在菱镁矿浮选脱钙中的应用,其特征在于,将抑制剂BAPTA用于菱镁矿浮选脱钙工艺。
  2. 如权利要求1所述的药剂在菱镁矿浮选脱钙中的应用,其特征在于,所述的药剂用于菱镁矿浮选脱钙工艺,具体包括以下步骤:
    步骤1:磨矿
    将高钙低品位菱镁矿破碎,球磨,得到菱镁矿粉;其中,菱镁矿粉中,粒级<74μm的菱镁矿粉的质量占总菱镁矿粉质量的70~90%;
    步骤2:调浆
    将菱镁矿粉置于浮选设备中,加入去离子水和抑制剂BAPTA二甲基亚砜溶液,并混合均匀,进行调浆,得到菱镁矿矿浆;其中,菱镁矿矿浆中,菱镁矿粉的质量浓度为20~40%;抑制剂BAPTA二甲基亚砜溶液的摩尔浓度为1.25~3.25g/L;按固液比,抑制剂BAPTA:菱镁矿矿浆=(30~60)mg:1L;
    步骤3:正浮选脱钙
    室温下,向菱镁矿矿浆中加入NaOH,调节pH值至10~12后,搅拌均匀,得到pH值为10~12的菱镁矿矿浆;
    向pH值为10~12的菱镁矿矿浆中,加入捕收剂油酸钠,搅拌均匀,然后进行正浮选粗选,得到低钙菱镁矿精矿;其中,按固液比,捕收剂油酸钠水溶液中捕收剂油酸钠:菱镁矿矿浆=(100~140)mg:1L。
  3. 如权利要求1所述的药剂在菱镁矿浮选脱钙中的应用,其特征在于,所述的步骤1中,所述的高钙低品位菱镁矿其主要成分及各个成分按重量百分比为MgO为25~35.5%,CaO为18~25%,SiO 2为0~0.5%。
  4. 如权利要求1所述的药剂在菱镁矿浮选脱钙中的应用,其特征在于,所述的步骤2中,所述的浮选设备为挂槽式浮选机,转速为1600~1900rpm。
  5. 如权利要求1所述的药剂在菱镁矿浮选脱钙中的应用,其特征在于,所述的步骤3中,所述的NaOH为质量分数为1~5%的NaOH水溶液;所述的搅拌均匀,搅拌速率为1600~1900rpm,搅拌时间为2~5min。
  6. 如权利要求1所述的药剂在菱镁矿浮选脱钙中的应用,其特征在于,所述的步骤3中,所述的正浮选粗选,正浮选设备的转速为1600~1900rpm,正浮选时间为3~5min。
  7. 如权利要求1所述的药剂在菱镁矿浮选脱钙中的应用,其特征在于,所述的步骤3中,所述的捕收剂油酸钠为摩尔浓度为0.01~0.05mol/L的油酸钠水溶液。
  8. 如权利要求1所述的药剂在菱镁矿浮选脱钙中的应用,其特征在于,所述的步骤3中, 在加入捕收剂油酸钠后,再加入起泡剂,搅拌均匀,最后进行正浮选粗选,所述的起泡剂为2号油,按固液比,2号油:菱镁矿矿浆=(4~6)mg:1L。
  9. 如权利要求1所述的药剂在菱镁矿浮选脱钙中的应用,其特征在于,所述的步骤3中,所述的低钙菱镁矿精矿主要成分及各个成分按重量百分比为MgO 47.5~48.5%,SiO 2≤0.3%,CaO≤0.6%。
  10. 如权利要求1所述的药剂在菱镁矿浮选脱钙中的应用,其特征在于,药剂用于菱镁矿浮选脱钙工艺中,低钙菱镁矿精矿的回收率按重量百分比为70~85%,低钙菱镁矿精矿中的MgO回收率按重量百分比为65~75%。
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