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Process for producing sand for construction through dehydration and desliming
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A process and desliming technology, which is applied in the field of building materials, can solve the problems of concrete performance, strength decrease, and mud content increase, etc., and achieve the effect of improving resource utilization, reducing stockpiling, and not polluting the road surface
Pending Publication Date: 2021-10-22
NANJING MEISHAN METALLURGY DEV +1
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[0005] The quality of sand has a great influence on the performance of concrete. As the mud content increases, the slump, impermeability and durability of concrete decrease, and the strength decreases significantly. Therefore, the mud content must be controlled. At the same time, the water content is large, and it is thrown during transportation, which affects environmental protection. , the water content must be controlled, therefore, a new solution is urgently needed to solve the above technical problems
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Embodiment 1
[0030] Embodiment 1: A kind of dewatering and desliming production construction sand technology, described technology comprises the following steps:
[0031] Step 1. Equipment selection demonstration and comparison;
[0034] Step 4, the height of the ore retaining plate at the ore discharge end of the sieve plate;
[0035] Step 5, the design of the inclination angle of the screen surface;
[0036] Step 6, vibration frequency and amplitude;
[0037] Step 7, second stage sieve desliming;
[0038] Step 8, separating and recycling the muddy water under the sieve.
[0039] Particle size analysis and mineral identification were carried out on the iron tailings, and the particle size was determined as mud content <0.074mm content, accounting for 9%, ≥4.75mm content 1.5%, water content 20%, iron grade 20.8%, the mineral composition of the ore Analysis and detection showed that the mai...
Embodiment 2
[0052] Particle size analysis and mineral identification were carried out on the iron tailings, and the particle size was determined as mud content 2 .
[0053] Step 1. Select the first section of 1530 linear vibrating screen with an effective screening area of 4.5m 2 , 2 vibration motors, power 2.9KW / unit, amplitude adjusted to 4.8mm, speed 1000 rpm, maximum excitation force 65KN, vibration frequency 16.6Hz.
[0054] Step 2. The material of the screen surface is a polyurethane sieve plate with a thickness of 30mm.
[0055] Step 3: Screen slot width 0.5mm;
[0056] Step 4: The height of the ore retaining plate at the ore discharge end of the sieve plate is 40mm.
[0057] Step 5. The inclination angle of the screen surface can be adjusted to 0.545°.
[0058] Step 6: The water content of the treated material is 18.5%, the mud content is 7.6%, and the ore feeding rate is 90t / h.
[0059] Step 7: Desliming with the second sieve.
[0060] Choose the same model as the first se...
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Abstract
The invention relates to a process for producing sand for construction through dehydration and desliming. The process comprises the following steps of: 1, carrying out equipment type selection, demonstration and comparison; 2, carrying out screen surface material type selection test; 3, carrying out screen seam width test; 4, determining the height of an ore baffle at the ore discharge end of a sieve plate; 5, designing the inclination angle of the screen surface; 6, determining the vibration frequency and amplitude; 7, desliming with a second-section sieve; and 8, separating and recycling undersize mud and water. According to the technical scheme, the sand quality standard in the building industry is met, the tailing resource utilization rate is increased, the stacking amount is reduced, the occupied tailing pond capacity is reduced, overflow water is clarified and recycled and is not discharged, no pollution is generated, and the process has an important effect on the ecological environment.
Description
technical field [0001] The invention relates to a process method, in particular to a dewatering and desliming process for producing construction sand, which belongs to the technical field of building materials. Background technique [0002] Concrete is the material with the lowest energy consumption and is the most widely used in construction. It accounts for 85% of the concrete mass. Sand and gravel are the concrete skeleton and the material that consumes the most natural resources. It is estimated that the annual construction aggregate consumption in the country is 10 billion tons. Since the 1960s, civil construction projects of hydropower systems have used local materials for the production and application of machine-made sandstone, and began to use it in engineering. There are a large number of metal mines and non-metal mines in our country, which produce 20% to 80% of tailings, and tens of billions of tons of tailings have been stockpiled. After sorting and processing, ...
Claims
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Application Information
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