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The fineness modulus is a key technical index to evaluate the quality of manufactured sand, directly affecting the workability, strength and durability of concrete. Controlling it within the standard range requires scientific technical measures, specifically as follows:
1. Clarify the Standard Range of Fineness Modulus
The national standard divides manufactured sand into three grades: coarse sand (fineness modulus 3.7-3.1), medium sand (3.0-2.3) and fine sand (2.2-1.6).
For general concrete engineering, medium sand (fineness modulus 2.3-3.0) is preferred; for high-strength concrete, coarse sand with good gradation is suitable.
2. Adjust the Crushing and Screening Process
Optimize the tertiary crushing parameters: Adjust the VSI crusher speed and discharge gap to control the proportion of fine powder and coarse particles.
Equip multi-layer vibrating screens: Use 3-4 layers of screens to classify sand particles into different specifications, ensuring reasonable gradation.
Add a sand washing process: Wash away excess fine powder (particle size ＜0.075mm) to adjust the fineness modulus.
3. Control the Raw Material and Equipment Factors
Raw material selection: Choose raw stones with uniform hardness and particle shape to avoid excessive fine powder caused by over-crushing.
Wear part maintenance: Regularly replace worn VSI crusher throw head and vibrating screen meshes to ensure stable crushing and screening efficiency.
Adjust the feeding speed: Stable feeding can avoid uneven particle size caused by overloading or underloading.
4. Real-Time Detection and Adjustment
Conduct regular sampling inspection: Test the fineness modulus of manufactured sand every 2 hours to monitor changes in real time.
Timely adjust parameters: If the fineness modulus is too high (too coarse), reduce the crusher discharge gap; if it is too low (too fine), increase the gap or reduce the washing time.
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50R&D engineers
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The user purchased two sets of sand production line, each set of equipment includes ZSW490*110 vibrating feeder, PE750*1060 jaw crusher, HST250 single-cylinder cone crusher, JYS1238 sand making machine, YK2460 vibrating screen, 3016 sand washer and so on.
The designed capacity of this sand making project is 200t/h, and the equipment used includes 490*110 vibrating feeder, PE750*1060 jaw crusher, PF1315 impact crusher, 9928 sand making machine, two sets of 2460 vibrating screen, two sets of 920 single screw sand washer, two sets of XSD2816 sand washer, two sets of dewatering screen, and several belt conveyors.
Project configuration: Jaw Crusher PE900*1200, Cone Crusher HST315T, Vertical Shaft Impact Crusher VSI6X1263, Heavy Duty Vibrating Screen 2YKZ3080/3YKZ3080, Vibrating Feeder ZG1220Z/ZSW1360, Twin Screw Sand Washer 2XL1120, Bar Vibrating Feeder ZSW1360B, Bucket Wheel Sand Washing Machine DS4024, dewatering screen TS2450 many types of equipment. They will work together with the whole production line to crush and process the sand trap cobbles and mountain ores into natural sand, mechanism sand, and uniform material.
The finished products of the project are used for high-speed railway construction and neighbouring construction materials, which will strongly promote the local economic development. In the future, Jianye Heavy Industry Company will continue to give full play to its years of practical experience in the sand and gravel aggregate, construction waste resource reuse, industrial powder making, silica sand and other industries, as well as EPC one-stop turnkey services, to cooperate with customers and jointly promote the high-quality, healthy and sustainable development of the sand and gravel industry.
Jiangsu Rugao Calcium Powder Factory purchased two sets of Jianye 4121 high-pressure mills for the production of heavy calcium powder, which is mainly used in the filler industry and coating industry, and now it also maintains a close cooperation relationship with Jianye, and every year Jianye sends technicians or sales managers to visit the user.
The user uses calcined petroleum coke to grind and make powder, and the finished coke powder is mainly used for processing graphite electrodes. In recent years, the price of coke powder rises, the user spends tens of millions of dollars to build a production line with an annual output of 60,000-100,000 tonnes of high-quality coke powder, which is the first phase of the project, using two sets of 6R4528 high-pressure grinding mills of Jianye Company.
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