渣浆泵选金矿混汞提 金法可分为哪两种类型?

混汞可分为内混汞和外混汞两种类型，内混汞是指在磨矿设备内边磨边混汞提金，用于处理品位较高的矿石或重选精矿;外混汞是指在磨矿设备之外进行混汞提金，可用于脉金选厂提前回收部分游离金。汞膏与矿浆分离后，从液态汞膏中榨出剩余的汞，固态汞膏蒸馏，即获得黑色海绵状金。

12混汞的影响因素 有哪些?

混汞过程中，汞对金的润湿作用受金的粒度和单体解离程度、金与汞的成分、矿浆介质酸碱度、矿浆浓度和温度、矿物成分，以及混汞工艺配置、设备和操作条件等因素影响，其中主要影响因素如下。
    ①金的粒度和单体解离程度。金粒大小、形状、结构、连生体对混汞效果的影响，主要决定于金粒从包裹它的矿物中的解离程度，即磨矿粒度。混汞法作业的显著特点之一，是采用较高的矿浆浓度和较大的磨矿排矿粒度。一般来说，适于混求的金粒粒度在-1mm+0. Imm,最大粒度不超过0.15mm粒度细小而又为

0.03mm以下的微细金粒易随矿浆流失，而不易与汞板上的汞形成汞齐，使回收率下降。

②金粉的成分及表面状态。在所有金矿床中，矿金成色高于脉金成色。而脉金中，氧化带矿石中金的成色又高于原生带矿石中金的成色。纯金表面亲汞疏水，最易被汞润湿。但自然金往往含银以及铜、铁、镍、铅、锌等杂质，杂质含量愈高，自然金粒的疏水性愈差，愈难被汞润湿。由于新鲜金粒表面最易被汞润湿，所以内混汞的金回收率一般高于外混汞的金回收率。

③汞的成分及表面状态。纯汞对金的润湿效果并不好。汞中含少量金银及贱金属，能降低汞的表面张力，改善润湿效果。如果汞中含贱金属过量，则由于这些贱金属在汞的表面形成氧化膜，反而影响了汞对金的润湿效果。当汞中含金量为0.1%~0.2%时，可以加速汞对金的汞膏化过程。汞中金银含量为0. 17%时，润湿金的能力可以提高0.7倍;当金银含量达5%时便可以提高两倍。汞中含铅、铜和锌不超过0.1%时，能促进对金的润湿;超过这一数值，在碱性介质中，则起破坏作用。
    ④矿浆温度与浓度。矿浆温度过低，矿浆黏度大，表面张力增大，会降低汞对金粒表面的润湿性能。适当提高矿浆温度可提高混汞指标，但温度过高将使部分汞随和浆而流失。一般混汞作业温度为15C以上。
    混汞的前提是使金粒能与汞接触，外混汞时的矿浆浓度不宜过大，一般应小于10%~25% 。磨矿循环中的混汞矿浆浓变以50%左右为宜。内混汞的矿浆浓度因条件而异，一般应考虑磨矿效率，内混汞矿浆浓一般高达6 0% -80%。辗盘机及捣矿机中进行内混汞的矿浆浓度一般为30%~50%。

⑤矿浆的酸喊度。实践表明，在酸性介质中或氰化物溶液(浓度为0.05%)中的混汞指标最好，由于酸性介质或氰化物溶液可清洗金粒表面及汞表面，可容解其上的表面氧化服。但酸性介质无法使矿泥凝聚。无法消除矿泥、可溶盐、机油及其他有机物的有

害影响，在碱性介质中可改善混汞作业的条件，如用石灰作调整剂可使可溶盐沉淀，消除油质的不良形响，还可使矿泥凝聚，降低矿浆黏度，一般混汞在pH为8-8.5的弱碱性矿浆中进行。
    此外，将电流通入混汞作业，可以强化来的捕金能力，电路的阴极连接于汞的表面上能降低汞的表面张力，活跃汞的性能，提高汞对金的润湿效果。
13如何处理汞膏?
    汞膏处理一般包括汞膏分离 与洗涤、压滤和蒸馏三个主要作业。
    ①汞膏分离与洗涤。从混汞板、混汞溜槽、捣矿机和混汞筒获得的汞膏，尤其是从捕汞器和混汞筒得到的汞膏混杂有大量的重砂矿物、脉石及其他杂质,须经分离和洗涤后才能送去压滤。
    ②汞膏压滤。汞膏压滤作业是为了除去洗净后的汞膏中的多余汞，以获得浓缩的固体汞膏(硬汞膏)，故将此作业称为压汞。压汞作业可用气压或液压压滤机进行。金矿山常用螺杆压滤机、风动和水力压滤机。
    ③汞膏蒸馏。由于汞的气化温度(356C) 远低于金的熔点(1063C)和沸点(2860C)， 常用蒸馏的方法使汞膏中的汞与金进行分离。渣浆泵

What are the two types of mixed mercury extraction of gold by slurry pump?

The mixed mercury can be divided into two types: internal mixed mercury and external mixed mercury. Internal mixed mercury refers to the extraction of gold by mixing mercury while grinding in the grinding equipment, which is used to treat high-grade ore or gravity concentrate; external mixed mercury refers to the extraction of gold by mixing mercury outside the grinding equipment, which can be used to recover part of free gold in advance in the pulse gold concentrator. After separation of mercury paste and pulp, residual mercury is extracted from liquid mercury paste and distilled from solid mercury paste to obtain black sponge gold.

12 what are the influencing factors of mixed mercury?

In the process of mixing mercury, the wetting effect of mercury on gold is affected by the size of gold and the degree of monomer dissociation, the composition of gold and mercury, the pH value of pulp medium, pulp concentration and temperature, mineral composition, as well as the process configuration, equipment and operation conditions of mixing mercury. The main influencing factors are as follows.

The size of gold and the degree of monomer dissociation. The influence of gold particle size, shape, structure and syngenetic body on the effect of mercury mixing is mainly determined by the degree of dissociation of gold particles from the minerals surrounding it, namely the grinding particle size. One of the remarkable characteristics of the operation of the mercury mixing method is to use a higher pulp concentration and a larger ore discharge particle size. Generally speaking, the particle size of gold suitable for mixed solution is - 1mm + 0. IMM, and the maximum particle size is not more than 0.15mm, which is fine and

The fine gold particles below 0.03mm are easy to lose with the pulp, but not easy to form amalgam with the mercury on the mercury plate, so the recovery rate decreases.

② composition and surface state of gold powder. In all the gold deposits, the color of ore gold is higher than that of vein gold. In vein gold, the color of gold in oxidized ore is higher than that in primary ore. The surface of pure gold is hydrophilic and hydrophobic, which is easily wetted by mercury. But natural gold often contains silver, copper, iron, nickel, lead, zinc and other impurities. The higher the content of impurities, the worse the hydrophobicity of natural gold particles, the more difficult it is to be wetted by mercury. Because the surface of fresh gold particles is most easily wetted by mercury, the gold recovery rate of internal mixed mercury is generally higher than that of external mixed mercury.

③ composition and surface state of mercury. The wetting effect of pure mercury on gold is not good. Mercury contains a small amount of gold, silver and base metals, which can reduce the surface tension of mercury and improve the wetting effect. If there are too many base metals in mercury, the wetting effect of mercury on gold will be affected by the formation of oxide film on the surface of mercury. When the content of gold in mercury is 0.1% ~ 0.2%, the process of mercury paste can be accelerated.  When the content of gold and silver in mercury is 0.17%, the ability of wetting gold can be increased by 0.7 times; when the content of gold and silver reaches 5%, it can be increased by twice. When the content of lead, copper and zinc in mercury is less than 0.1%, it can promote the wettability of gold; when the content of lead, copper and zinc is more than 0.1%, it can destroy gold in alkaline medium.

④ pulp temperature and concentration. If the temperature of pulp is too low, the viscosity of pulp is large, and the surface tension is increased, the wettability of mercury on the surface of gold particles will be reduced. If the temperature of pulp is increased properly, the index of mixed Mercury will be increased, but if the temperature is too high, some Mercury will be lost with the pulp. Generally, the temperature of mercury mixing operation is above 15C.

The premise of mixing mercury is to make the gold particles contact with mercury, and the pulp concentration should not be too large when mixing mercury, generally less than 10% ~ 25%. In the grinding cycle, the concentration of the mixed mercury ore pulp should be about 50%. The pulp concentration of internal mixed mercury varies with different conditions. Generally, grinding efficiency should be considered. The pulp concentration of internal mixed mercury is generally as high as 60% - 80%. The pulp concentration of internal mixing mercury in rolling and vibrating machine is generally 30% ~ 50%.

⑤ acid content of pulp. The practice shows that the mixed mercury index is the best in the acid medium or cyanide solution (concentration is 0.05%). Because the acid medium or cyanide solution can clean the surface of gold particles and mercury, it can dissolve the oxidation clothing on the surface. But the acid medium can't make the slime agglomerate. It is impossible to eliminate slime, soluble salt, engine oil and other organic matters.

Harmful effect: in alkaline medium, it can improve the conditions of mercury mixing operation. For example, using lime as an adjusting agent can make soluble salt precipitate, eliminate the bad effects of oil quality, and also make the slime agglomerate, reduce the viscosity of the pulp. Generally, mercury mixing is carried out in weak alkaline pulp with pH of 8-8.5.

In addition, when the current is introduced into the mercury mixing operation, the ability of catching gold can be enhanced. The cathode of the circuit connected to the surface of mercury can reduce the surface tension of mercury, activate the performance of mercury, and improve the wetting effect of mercury on gold.

How to deal with mercury paste?

The treatment of mercury paste generally includes three main operations: separation and washing of mercury paste, pressure filtration and distillation.

① separation and washing of mercury paste. The mercury paste obtained from the mercury mixing plate, the mercury mixing chute, the ore rammer and the mercury mixing cylinder, especially the mercury paste obtained from the mercury catcher and the mercury mixing cylinder, is mixed with a large number of heavy minerals, gangue and other impurities, which must be separated and washed before being sent to the pressure filtration.

② mercury paste pressure filtration. The purpose of mercury paste filtration is to remove the excess mercury in the cleaned mercury paste, so as to obtain the concentrated solid mercury paste (hard mercury paste), so this operation is called mercury injection. Mercury injection can be carried out by air pressure or hydraulic filter press. Screw filter press, pneumatic filter press and hydraulic filter press are commonly used in jinjinshan.

③ distillation of mercury paste. Because the gasification temperature (356C) of mercury is far lower than the melting point (1063c) and boiling point (2860c) of gold, the common distillation method is used to separate mercury from gold. Slurry pump