five barite mining processes and common barite mining equipment - xinhai
Barite is a common mineral of barium, and the elements of barite are barium sulfate, the BaO accounts for 65.7% and SO3 accounts for 34.3%. It is an important industrial raw mineral material for making barium and barium compounds.
Taking the barite deposit in China as an example, it can be divided into four types: sedimentary deposit, volcano-sedimentary deposit, hydrothermal deposit, and residual deposit. According to ore types, raw ore properties, mine scale and application, the common barite mining processes mainly include handpicking, gravity separation, flotation, magnetic separation and combined barite mining process.
In general, the residual barite ore can be separated by the gravity separation method. The sedimentary barite ore and hydrothermal barite ore associated with sulfide ore and fluorite can be extracted by the gravity separation and flotation method. Below, we will explain to you one by one each barite mining process and barite mining equipment.
After the raw ore is extracted, simple handpicking is a common barite mining process for many small barite mines. Some barite mines have a high geological grade and stable quality, so the qualified barite products can be selected by handpicking according to the difference in the color and density between barite and associated minerals. For the rich barite ore selected by hand, the grain size shall be 30-150mm, and the BaSO4 shall be larger than 95%, generally larger than 92%. In general, the simple handpicking process is easy to operate and can be carried out without barite mining equipment. This barite mining process is suitable for the small-scale barite mining plant, but it also has the disadvantages of low productivity, high ore grade requirements and serious resource waste.
This barite mining process is mainly based on the density difference between barite and associated minerals, including ore washing, screening, desliming, jigging, shaking table, which is mostly used to treat residual barite ore.
After the raw ore is treated with washing, screening, crushing, classification and desliming, the high-quality barite concentrate can be obtained by jigging and shake table. The crushing stage adopts the jaw crusher and impact crusher, the fine crushing stage adopts the double roll crusher. The separation stage adopts a heavy medium rotary drum separator, cone classifier, jig or shake table. The heavy medium separation and jigging separation can be used when the particle size of barite is larger than 2mm, but the upper limit of particle size of heavy medium separation is 50mm, and the upper limit of wet and dry jigging separation is about 20mm. The shake table can be used for separation when the particle size of the barite is less than 2mm, but he hydrocyclone must be used to remove the mud before the separation, so as to improve the separation effect.
The specific gravity of the barite is large, generally 4-4.6, and it also has a good floatability. The barite flotation process is mainly used to separate the sedimentary barite and hydrothermal barite ore associated with sulfide ore and fluorite based on the difference of surface physical and chemical properties between barite and associated minerals.
Taking the barite ore in China as an example, the barite deposits are featured with more lean ore and less rich ore. More than 80% of the proven reserves are associated with other minerals. The flotation method must be used for the separation of fine barite ore and gravity separation tailings. The main barite flotation processes are positive flotation process and reverse flotation process, in which the purpose of the reverse flotation process is to remove the alkali sulfide.
As a common salt mineral, the barite flotation process can be divided into two types according to the form of adsorption: one is to use fatty acid alkyl sulfate, alkyl sulfonate and other anion collectors to adsorb on the surface of barite mineral in the form of chemical adsorption, so as to separate from the other associated minerals. Another is to use an amine collector to float barite in the form of physical adsorption. The amines collector has low efficiency and is very sensitive to the influence of slime, so it is suggested to adopt the anionic collector in this barite mining process. In general, add the NaOH to the ball mill, adjust the pH value to 8-10, and add the sodium silicate to the slurry as the regulator, then use the oleic acid collector in the barite flotation process under the condition of 40%-50% solid concentration.
The barite magnetic separation process is mainly based on the surface magnetic difference between barite and iron oxide minerals, which is widely used to separate the iron-containing barite. The magnetic separation process is often used as the combined process with gravity separation, which can produce the barite a material of barium-based drugs requiring very low iron content.
The combined barite mining process of gravity separation and flotation is often used for the barite associated with sulfide ores. For the flotation-gravity separation process used to treat the barite-quartz-calcite ore, add the sodium silicate and collector into the flotation tank of flotation machine for removing the quartz, and obtain the barite-calcite mixed ore, and adopt jig, shake table to obtain the barite concentrate based on the density difference between gangue minerals (such as calcite) and barite.
The early mining barite ore is mostly high-grade ore, which is usually separated by the low-cost and low technical handpicking or gravity separation process. However, with the low grade of barite ore and the complex ore properties, magnetic separation, flotation and combined barite mining processes have been widely used in barite mining. It is suggested that each mine owner should make a scientific and reasonable barite mining process according to the beneficiation test report, avoiding unnecessary economic losses.
vu120 machine-made sand production line
The use of highly-intensive fully-closed tower-like layout integrates the high-efficiency sand-making system, particle shape optimization, stone powder control, grading adjustment, water content control and environmental protection, which can optimize and adjust the indexes like the particle shape, grading, powder content and fineness modulus so that machine-made sand can completely replace natural sand in concrete and mortar preparation. The performance of machine-made sand gets improved and the cement as well as additives can be saved a lot.
Since the launch of Technical Regulations of Concrete Prepared by Machine-made Sand by China's Ministry of Housing and Urban-Rural Construction (MHURC) in 1973, machine-made sand has been developed extensively. Besides, the development of machine-made sand is deeply influenced by the macro-control policy, industrialization, B&R initiative, urbanization and ecological management.
The cost for quarrying natural sand gets higher and higher while the amount gets less and less because of excessive quarrying. Natural sand is non-renewable resource, so, to keep natural terrains and protect river wall as well as the ecological balance, the natural sand quarrying has been prohibited in some regions.
The sand produced by VU meets the standards of GB/T14684 and JGJ52. The sand can be adjusted according to the practical requirements. The fineness modulus can be controlled within 2.0-3.5; the powder content 3-15%.
Based on over 30-year experience in this industry, SBM spent 5 years developing VU system at the specialized aggregate optimization test site to satisfy the increasing demand for high quality sand and the performance requirement of concrete and mortar. VU Aggregate Optimization System is a scheme system designed to produce high quality machine-made sand which overcomes the problems in the sand-making technology including crushing, grinding and separating. In this production line, VU Aggregate Optimization System perfectly met all the machine-made sand production standards of Shijiazhuang Hengxin Jinshuo Construction Material Company.
The perfect combination of screening and beneficiation makes the fineness and modulus controllable. Connecting the mature theories of crushing, screening and beneficiation and based on the design of full-closure, dust-collecting via negative pressure and screening evenly ,the tasks of material screening and dust removing can be finished on a single machine excellently at the same time, greatly increasing the productivity and avoiding the problems existing in traditional dry-type screening technologies like dust and sludge treatment.
The negative pressure dust collector is used. The closed operation in the whole process including the transportation from fine ore bin to powder tank car is to ensure the dust-free site and the attainment of national environmental standard.
The world's first efficient particle type optimization technology, imitating formation principle of natural sand, the machine adopts the global pioneering technologies of "low energy crushing and dressing" and "self-grinding via falling mode" that can validly remove the edges on the surface of final products and increase the volume of fine sand of -0.6mm so that the grading and particle shape can get optimization. And the voidage reduces 1-2%; the flow time 5%.
Setting and keeping the optimal operating parameters is available. And the quality of products is stable. This system can maximize the productivity and keep the overall efficiency at the highest level.
After being crushed and shaped by the VU Sand-making Crusher, the tailings below 10mm as raw materials are divided into three components under the action of FM Control Screen and Dust Collector--- stone powder, reverting material and finished sand product. Stone powder is collected by Dust Collector and stored at the fine ore bin while the finished sand product enters the Particle Shape Optimization Machine for further dressing and then is taken the last processing step--- mixing in humid environment. Processed by VU Aggregate Optimization System, raw materials can be turned into high-quality sand with reasonable grading, smooth shape and controllable powder content, and dry, clean, recycled and high-quality stone powder (Application fields depend on raw materials).
The VU Aggregate Optimization System---- a world-leading dry-type sand-making system designed by SBM for machine-made sand production of Shijiazhuang Hengxin Jinshuo Construction Material Company was upgraded fully on the basis of the existing dry-type sand-making system. The use of highly-intensive fully-closed tower-like layout integrates the high-efficiency sand-making system, particle shape optimization, stone powder control, grading adjustment, water content control and environmental protection. Not only does the productivity increase a lot, but also all standards including particle shape, grading and powder content improves so that the performance of machine-made sand can be compared with natural sand and new chances and value in the development of sandstone, cement and concrete industry are created.
A. Environmental technology: The fully closed transportation and production and the negative pressure dust removing design avoids raising dust in production sites. The dry-type production and screening technology avoids the emission of waste water and slush.
B. Environmental operation: Moisture Content Control Machine(optional) keeps the water content of finished sand product qualified and avoids raising dust. The powder storehouse monitoring and automatic telescopic material discharging design prevent the stone powder from spilling in transit. Besides, the dry-type dust removing and separating technology keeps the dryness and cleanness of stone powder, making the treatment and overall utilization easier.
A. Efficient production: The all-around innovation of crushing and grinding technologies increases the sand production rate by over 10%. The integrated dry-type screening technology elevates the screening efficiency obviously and the screen area can be reduced by over 50% compared with that of traditional technology. The performance improvement of single machine and the reasonable use of technologies reduce the electricity consumption a lot and increase the processing volume by 5-10%.
B. Efficient operation: The intensive tower-like design occupies smaller floor areas. For example, an area of 7.5m24m can place the body part of VU70. The new anti-abrasive design and the upgrading of materials prolong the life span of wear-resistant parts and reduce the maintenance downtime a lot. The integrated control system and online adjustment design can adjust the system settings in operation, increasing the quality and yield of finished sand product and reducing labor force.
A. Reasonable grading: Integrated crushing & grinding functions and flexible screening design make the grading of finished sand product continuous, adjustable and controllable. The fine sand within 0.15-0.6mm increases sharply while the coarse sand with fineness within 2.36-4.75mm reduces relatively. The grading meets the American standard ASTMC33the secondary level of Chinese standard JGJ52 and Indian standard IS383.
B. Smooth particle shape: Completely original grinding and material falling shaping technologies mainly produce square and spherical sand. The edges on the sand surface are reduced to the extreme. Meanwhile, the superficial area and voidage decreases obviously and the fluidity is therefore increased.
C. Controllable powder content: dry-type powder removing technology keeps powder content of finished sand product (0-0.15mm) stable and controllable within 3-15%. The dry and clean stone powder got by dry-type separation method can be recycled.
The raw materials are relatively clean low-value stone chips with fineness within 0-5mm and 5-10mm. The 0-5mm stone powder before being processed is 4 yuan per ton while the processed high-quality machine-made sand is 45 yuan per ton with the value of tailings increasing by 40 yuan per ton.
Sand produced by VU system can completely replace natural sand to prepare C20-C60 concrete and other special kinds of concrete. The machine-made sand has high strength, wide applicable performances and can save the use of cement and additives.
2. Receiving related data of VU system, the plan for installation must be enacted in advance. According to the size of each part, it is necessary to plan what we need in every installation process like the spare parts, materials, tools, cranes, staff and time so as to greatly reduce the time and cost for installation and to ensure the finish of project on time.
3. 10-20 workers are required to form an installation team. And they must have over 2-year experience in machinery and steel industry. Besides, after the security training, they have a strong conscience of self-security. Moreover, related skills must be grasped well. Before working, they must wear all protective appliance like work clothes, safety helmet, safety shoes and gloves. Meetings about safety and quality requirements are held in advance and each individuals working responsibility is assigned. The progress of project and related problems would be taken down every day and regular project meetings are held.
The project using sand and gravel tailings to make high-quality sand was offered by SBM. SBM offered both equipment and installation service. The whole process of installation was successful and VU120 system was put into operation on schedule. The operation was stable with little noises and no dust. The most important thing was that using the wastes produced by previous production to make valuable products brought us great economic profits.