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Here FDM to introduce the content of potassium dichromate volumetric method tests iron. The basic principle is: In acidic solution, using stannous chloride reduction of the ferric iron is bivalent, High mercury chloride was added to remove excess stannous chloride, sodium diphenylamine as indicator, titrate with standard potassium dichromate solution to purple. The advantages of this approach are: Easy to remove excess stannous chloride, potassium dichromate solution is relatively stable, significant changes in the titration end point, by the effect of temperature (30 ℃ below) is small, a more accurate measurement result.

    一、Sulfur – phosphorus mixed acid soluble samples

    1. Drugs and reagents

    1）（2+3）Parathion mixed acid

    2）Potassium dichromate standard solution: 1.00mL solution is equivalent to 0.0020g iron.

Weigh 1.7559g pre-dried at 150 ℃ for 1h potassium dichromate (reference reagents) in 250mL beaker, dissolved in a small amount of water moved into 1L volumetric flask, water volume.

    3）Stannous chloride solution：10%

Weigh 10g of stannous chloride dissolved in 20mL of hydrochloric acid, dilute with water to 100mL.

    4）High mercury chloride saturated solution：5%

    5）Diphenylamine sulfonate indicator：0.5%

    6）NaF

    2.Analysis step：

Weigh 0.2g sample in 250mL Erlenmeyer flask, with a little water, wet, shake. Join 10mL parathion mixed acid and 0.5 g of sodium fluoride, shake. On the high temperature heating furnace completely dissolved, remove cooling, 15mL of hydrochloric acid, heated to near boiling, and a low temperature to maintain 3-5min, dark solution became clear, a solution of stannous chloride was added dropwise while still hot to remove iron (III) ions yellow disappears and two drops of excess water rinse the cup wall. Cooled in a water bath, was added 10mL of saturated solution of high mercury chloride, placed after shaking 2-3min, add water to about 120mL, was added 5 drops of 0.5% sodium diphenylamine indicator After cooling, titration with a standard solution of potassium dichromate to purple. Simultaneously with the blank test sample analysis.

    3.Note:

    1）When you need to use a high temperature furnace sample dissolution, and continue to shake the flask to accelerate decomposition, or in the bottom precipitated pyrophosphate or metaphosphate, make the results unstable.

    2）Fusion and temperature must be strictly controlled. Iron ore is typically heated at 250 ~ 300 ℃ 3-5 minutes decomposition. Temperature is too low, the sample is not easy to break down; humidity is too high, too long, will be converted into insoluble phosphate, pyrophosphate, cemented lumps at above 350 ℃, the impact of titration end discrimination, low and to the results.

    3）Good control of tin dichloride reduced iron (III), dropping amount. Excess tin dichloride was oxidized mercury dichloride, should produce a white filamentous precipitate. If too much excess of the reducing tin dichloride, tin dichloride is further reduced to metallic mercury, a gray or black precipitate. Dichromate oxidation of metallic mercury is easy to make the results of the high iron. When this happens, you should re-determination of said sample.

    4）Mercuric chloride solution should be added in a small volume, silky luster white precipitate. This mercury precipitates produced relatively slow. So after adding mercury dichloride should shake and text placed 2 ~ 3min, time is too short, the result is high.

    5）Indicator must be freshly prepared, should be replaced once a week.

The gravity separation is one of the beneficiation. Gravity separation widely applied to deal with coal, non-ferrous metals, rare metals, precious metals ore, and also could process asbestos and nonmetallic. In order to increase the separation effect of fine particle material, in the gravity separation also can adopt spiral chute, shaking table, centrifuge, hydrocyclone’s centrifugal force field.

The gravity separation utilize the difference of separation mineral particle density,granularity,shape of and the difference of motion rate and direction to make it apart. The gravity separation have heavy medium separation, jigging concentration, shaking table, chute beneficiation, centrifugale separation.

The advantage of gravity separation:
1. The production cost is low.
2. The rang of material granularity is wide, coarse particle about few hundred millimeter, the fine particle reach 0.02mm.
3. Less environmental pollution, product easy to be dewatered

Jaw crusher (named tiger mouth) appeared in 1858. First of all, jaw crusher machine is applied to road construction, then applied to mining machinery. The jaw rock crusher has crushing ratio, final product particle equality, simple structure, stable work, easily maintenance, cost economic etc. Jaw crusher is widely applied to mining machinery, metallurgy, building material, highway, railway, water conservancy and chemical industry etc. Many kind of material which crushing pressure less than 320 Mpa. Jaw crusher struction consist of fixed body, rotating body, safety device, adjusting device etc. The crushing cavity is deep and no block area, then improve the feed input and capacity. The crushing ratio, the final product particle is even. So these advantages shows jaw crusher is the best choice as primary crusher in stone crushing line.

Floatation process is a complicated mineral process. The effect factor divide into unable adjustment factor, raw ore character and water quality and able adjustment factor, floatation flow, ore grinding fineness, ore pulp density, ore pulp PH value, floatation reagent system. In the floatation process,the mineral’s ups and downs is unrelated with the mineral density, such as chalcopyrite and quartz, the chalcopyrite density is 4.2, the quartz density is 2.68. But the heavy mineral chalcopyrite is easy float upward,the quartz opposite down to the bottom. According to research, the floatability of mineral relate with the its compatibility with water. If the mineral compatibility with water is big,easily to be wet, then will be hard to float upward. If the mineral compatibility with water is small, hard to be wet, then easy to float upward. So floation is base on mineral if easy to be wet as standard. At present the floatation process, floatation reagent is applied especially important. Cause the floatation reagent can change the compatibility of mineral floatation, then achieve the beneficiation purpose. During the floatation beneficiation process, in general will need floatation cell. Nickel ore, copper ore, gold ore and other ore will use floatation method.

The hematite magnetic separator mainly used for fine-grained non-ferrous metals, non-metallic mineral purification, such as cassiterite feldspar, andalusite, sillimanite,Quartz sand, zircon and other minerals purification. Intensity magnetic separator machine for magnetite particle size less than 3mm, pyrrhotite, roasted ore, ilmenite and other materials, but also for coal, iron work, non-metallic minerals, building materials and other materials.

The main function of intensity magnetic separator: the removal of miscellaneous stone, improve quality and achieve sales. Used for Manganese poor, poor limonite, hematite poor weakly magnetic ferrous metal ores or ore sorting cleaning, the ore concentrate and miscellaneous stone in separation, thereby enhancing the metal grade concentrates.

Strong magnetic separator magnetic system, using high-quality ferrite material or composite made with rare earth magnets, tube sheet average magnetic induction intensity of 100-600mT. According to user needs, can provide a variety of different table strong magnetic downstream, semi-counter, and so on. The separator has a simple structure, large capacity, easy to operate, easy to maintain.

Note: Know more about magnetic separator, please leave word or send us email, we will reply to you as soon as possible!

Shaking table is gravity separation equipment which apply to separate particle material. So shaking table is one of ore beneficiation machine. Shaking bed widely apply to separate Tin, Tungsten, Gold, Silver, Lead, Zinc, Tantalum, Iron, Manganese, Coal etc. FDM shaking table keep improving, and improve the capacity, recovery efficiency etc.
Shaking table consist of head of bed, motor, adjusting part, bed, mineral trough, water trough, movable bar and lubrication system.
6-S shaking table working for dealing with metal mineral, the effective separation particle range is 3-0.019mm. The 6-S shaking table’s prominence advantage is the separation with high precision. Once separation can get high grade ore concentrate or tailing.

The granite contains plentiful mineral resources. This is well known of geology chemical industry. But as the fast development of modern industry, base on precise machinery manufacturing industry, the granite is applied as one kind of new material. The granite mainly consist of feldspar and quartz. Because granite is plutonic, and usually could form good and differentiable mineral particle. Thus as known,the granite not easy to be weathered, color looks good, The appearance and color can stay for hundred years above. Because of its high hardness, wear-resistent , apart from applied in senior building decoration project、hall ground, still is the first choice for open-air sculpture.

If the granite apply to these industries more widely, should be processed by professional equipment. First should be broken plastic, FDM granite crusher (Impact crusher) can deal with 100-500mm size below material. The compressive strength can achieve 350 Mpa each soft hard mineral. The figure will form cubic particle. FDM granite stone crusher simple structure, special impact liner,. Hard rock crushing efficiency and energy saving, complete crushing function, high productivity, little parts wear consumption,discharge opening range is adjustable,simplify crushing process, save production cost, and is the first choice of granite,limestone medium hardness material crushing.

Magnetic separation is one of beneficiation in mineral process field. Which have good effect separation, big capacity, high recovery etc. The magnetic separation is popularly used in iron ore beneficiation process.
The magnetic separation according to the difference of magentic intensity divide into strong magnetic separation, medium magnetic separation, weak magentic separation and non-magnetic separation.
There are many different kinds of magnetic separation machines. There are dry magnetic separation, wet magnetic separation, strong magnetic separator, weak magnetic separator.

The geology structure situation of Ningxia in China shows that it’s advantage the energy mineral and nonmetal mineral to be formed. In Ningxia people already found many different kinds of mineral resources almost 50 types. The places almost thousand. The storage of D step above mineral places more than 110. These mineral have large reserves,good quality,easy to exploit. The abundant storage include coal,limestone,gypsum,silex,barite etc. About limestone crushing process, first choice is FDM company Impact crusher.
The limestone is kind of sedimentary rock which consist of calcite. The limestone can process to be stone directly or fire to be quicklime. The lime has quicklime and white lime. The lime and limestone apply to building material in a large number. Also is the most important material for many industries. During the process of lime, most material need to crush, in order to do the next step. FDM engineer warn that causes of affecting material crushing system there are a lot, so analysis correctly and in control of each factor which is very important for selecting economic reasonable crushing system. Because limestone belong to soft material, FDM impact stone crusher is the best choice. The crushing cavity of impact crusher machine can accept big size material and make it got crushed, and won’t compact material,this limestone crusher won’t full load.

1. How to build the aggregate factory, stones factory, quarry, gravel plant, sand plant and mine factory?
The first step is to investigate the market, to see whether the market prospects in this business, how is the profit and sale? Don’t blindly fight.
The second step is to select mines or river, handle the relevant mining procedures, this is a must, otherwise even the hastily produced, will be a lot of trouble.
The third step is to investigate the device, select a relatively strong strength of all aspects of the manufacturers, to order a set of excellent quality aggregate production line equipment.
The fourth step, after buying the mining crushing and screening equipment, these devices are not enough, the crushing and screening equipments are just one part of it, we also need to solve the engineering machinery, such as loaders, excavators, transport vehicles and other problems, as well as the mining machinery of blasting problems.
The fifth step, installation and commissioning test run after all the equipments in place, recruit workers, draw up the mining system and management; contact the customer at last production and sales. In fact, a considerable portion of the actual operation is the have clients first and then to invest and produce, the sales is the first.
2. In stone production line, sand making production line and beneficiation flow which mechanical equipments are required?
In crushing and screening, aggregate production line include coarse crushing of jaw crusher, fine crushing of jaw crusher machine, impact crusher, cone crusher, hammer crusher, double roll crusher, sand making machine, vibrating feeder, circular vibrating screen, sand washing machine, spiral ore washing machine, belt conveyor and so on. According to installation, it can be divided into fixed, semi-mobile and mobile three; the processing capacity of it is 10-500 t/h, product size and size distribution according to user needs.