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Cassava starch pretreatment-special-shaped medium magnetic separation process

A cassava starch and pretreatment technology, applied in the direction of magnetic separation, high-gradient magnetic separator, solid separation, etc., can solve the problems of iron ore resource loss, difficult mineral resource sorting, etc., achieve large magnetic field force, strengthen recovery, and process The effect of simple structure

Inactive Publication Date: 2018-10-19
NORTHEASTERN UNIV
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  • Claims
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Problems solved by technology

At present, iron ore resources that are easy to be processed in my country are decreasing year by year, but there are abundant reserves of weakly magnetic iron ore resources embedded with fine particles. Since the embedded particle size of useful minerals in this part of resources is often less than 20 μm, it is difficult to adopt conventional mineral processing equipment and mineral processing technology. Realize effective sorting of these mineral resources, so that a large amount of iron ore resources will be lost during the sorting process

Method used

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  • Cassava starch pretreatment-special-shaped medium magnetic separation process
  • Cassava starch pretreatment-special-shaped medium magnetic separation process
  • Cassava starch pretreatment-special-shaped medium magnetic separation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1)取两份TFe品位分别为26.65%,26.61%,浓度为33%,粒度为-0.038mm占95%以上含弱磁性铁矿物的矿浆,在搅拌转速为1000r / min的条件下,加入质量浓度为2%的NaOH溶液匀速搅拌5min,调节矿浆pH值为10.0。

[0031] (2)降低搅拌转速至650r / min,在两份矿浆中均加入对铁矿物具有选择性絮凝作用的木薯淀粉溶液,匀速搅拌5min,使矿浆中的铁矿物通过木薯淀粉的桥联作用形成具有一定强度、大小适中的弱磁性铁矿物絮团,从而增加铁矿物在磁选过程中的捕获概率其中,所述矿浆与木薯淀粉溶液的质量比为50:1。

[0032] (3)将其中一份矿浆给入到含有异形介质的立环高梯度磁选机进行分选,将另一份矿浆给入到含有常规圆棒介质的立环高梯度磁选机进行分选。在背景场强为7000奥斯特,脉动冲程为15mm,脉动冲次为200次 / min、矿浆流速0.03m / s的条件下进行一次强磁粗选作业,其中采用木薯淀粉预处理-异形磁介质联合新工艺可以获得铁品位为42.26%,铁回收率为43.69%的强磁粗选磁性产物;采用木薯淀粉预处理-常规圆棒介质强磁选工艺获得的磁性产物铁品位为42.36%,铁回收率为40.88%。

[0033] (4)将两份强磁粗选尾矿在背景场强为10000奥斯特,脉动冲程为15mm,脉动冲次为150次 / min、矿浆流速0.03m / s的条件下进行两次扫选,将两次扫选磁性产物与粗选磁性产物混合,其中采用木薯淀粉预处理-异形磁介质强磁选工艺可以获得最终铁品位为42.35%,铁回收率为75.76%的强磁选磁性产物以及含铁品位为12.55%的扫选尾矿产品;常规强磁选工艺获得最终铁品位为40.61%,铁回收率为71.28%的强磁选磁性产物以及含铁品位为13.56%的扫选尾矿产品。

Embodiment 2

[0035] (1)取两份TFe品位分别为26.85%,26.71%,浓度为33%,粒度为-0.038mm占95%以上含弱磁性铁矿物的矿浆,在搅拌转速为1000r / min的条件下,加入质量浓度为2%的NaOH溶液匀速搅拌5min,调节矿浆pH值为9.5。

[0036](2) Reduce the stirring speed to 650r / min, add cassava starch solution which has selective flocculation effect on iron minerals to both pulps, and stir at a constant speed for 5min, so that the iron minerals in the pulp can pass through the bridging effect of cassava starch Weakly magnetic iron mineral flocs with certain strength and moderate size are formed, thereby increasing the capture probability of iron minerals in the magnetic separation process, wherein the mass ratio of the pulp to tapioca starch solution is 40:1.

[0037] (3) One part of the pulp is fed to the vertical ring high gradient magnetic separator containing special-shaped media for separation, and the other part of the pulp is fed to the vertical ring high gradient magnetic separator containing conventional round rod media for separation . Under the conditions of backgroun...

Embodiment 3

[0040] (1) Get two parts of TFe grades and be respectively 26.85%, 26.77%, concentration is 30%, particle size is - 0.038mm accounts for more than 95% ore pulp containing weak magnetic iron minerals, under the condition that stirring speed is 1000r / min, add The NaOH solution with a mass concentration of 2% was stirred at a constant speed for 5 minutes, and the pH value of the slurry was adjusted to 9.0.

[0041] (2) Reduce the stirring speed to 600r / min, add cassava starch solution to one part of the pulp, and stir at a constant speed for 5 minutes, so that the iron minerals in the pulp can form a weak magnetic iron with a certain strength and a moderate size through the bridging effect of cassava starch. Mineral flocculation, thereby increasing the capture probability of iron minerals in the magnetic separation process, wherein, the mass ratio of described ore pulp and tapioca starch solution is 40:1; In another part of ore pulp, do not add tapioca starch solution, stir at a c...

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Abstract

The invention relates to a cassava starch pretreatment-special-shaped medium magnetic separation process, and belongs to the technical field of mineral machining. The cassava starch pretreatment-special-shaped medium magnetic separation process comprises the steps of pulping, weak-magnetism iron ore flocculation pretreatment, magnetic separation and scavenging, wherein the magnetic separation comprises the following steps: the high magnetic separation is performed on pulp, obtained by treatment, by adopting a vertical ring pulsation high-gradient magnetic separator with a special-shaped magnetic medium box with a circular section with sawteeth under the conditions of the background field strength of 5000-10000 Oersted, the pulsation stroke of 0-20 mm and the pulsation jig frequency of 0-250 t / min to obtain high magnetic separation magnetic products. Compared with a traditional reinforced fine particle weak-magnetism iron ore recovery process, the method has the advantages of high ironrecovery rate, low comprehensive cost, simple flow structure and the like.

Description

technical field [0001] 本发明涉及一种木薯淀粉预处理-异形介质磁选工艺,属于矿物加工技术领域。 Background technique [0002] 随着工业化和现代化建设进程的不断加快,我国对于铁矿石的需求量不断增加,大量优质铁矿资源不断被开发利用,导致国内铁矿资源贫、细、杂的特点愈加明显。目前,我国易选的铁矿石资源逐年减少,但微细粒嵌布的弱磁性铁矿资源储量丰富,由于这部分资源中有用矿物的嵌布粒度往往小于20μm,采用常规选矿设备和选矿工艺难以对这些矿产资源实现有效的分选,使大量铁矿资源在选别过程中流失。通过一方面优化选别作业的入选物料性质,另一方面优化选别作业的工艺参数及设备的方法,这对于强化微细粒嵌布的弱磁性铁矿资源的开发利用具有重要意义。 Contents of the invention [0003] 针对上述微细粒嵌布的弱磁性铁矿资源的高效开发利用的问题,本发明提供一种木薯淀粉预处理-异形介质强磁工艺,所述方法将含有微细粒的弱磁性铁矿物的矿浆中添加适宜的药剂进行预处理,从而增大目的矿物的表观尺寸,满足后续选别作业的粒度要求,同时可以消除机械夹带、矿泥罩盖等不利因素。同时,在高梯度强磁选工艺中,选用异形磁介质聚磁介质作为高梯度磁选作业的载体,强化微细粒弱磁性铁矿物的回收。 [0004] 一种木薯淀粉预处理-异形介质磁选工艺,所述方法包括调浆、弱磁性铁矿物絮凝预处理、磁选的步骤,其中,所述磁选的步骤为: [0005] 将预处理后所得矿浆在背景场强为5000~10000奥斯特,脉动冲程为0~20mm,脉动冲次为0~250次 / min的条件下,采用具有异形磁介质盒的立环脉动高梯度磁选机进行强磁选作业,得到强磁选磁性产物, [0006] 所述异形磁介质盒包括呈阵列排布的带有锯齿的圆棒磁介质棒组成,所述磁介质棒在阵列的行方向和列方向上间隔排布,所述阵列的列间隔为同一列相邻磁介质棒的垂直中心间距,其大小为4.0~8.0mm;所述阵列的行间隔为同一行相邻磁介质棒的水平中心间距,其大小为4.0~8.0mm,其中,所述圆形磁介质棒的直径为2mm,所述介质棒表面的锯齿呈均匀分布,个数为6~12,锯齿大小为0.1mm~1mm。 [0007] 本发明所述锯齿大小,指的是锯齿顶点到圆周的垂直距离。 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C1/025B03C1/005
CPCB03C1/025B03C1/005
Inventor 韩跃新周立波李文博李艳军
Owner NORTHEASTERN UNIV
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