Configuration and design of 1000tph limestone aggregate production plant
In the crushing and sand making industry, limestone is one of the most common used raw materials. It is often used as a building material and is also an important raw material for many industries. Because of its wide distribution, limestone crushing &sand making lines are very common, with capacity ranging from hundreds to thousands of tons per hour.
This article takes the 1000t/h limestone aggregate line as an example to introduce the equipment selection, process flow, production line layout, dust treatment and other details of the sand and gravel aggregate line for reference.
Equipment selection of limestone crushing & sand making plant
There are mainly three types of commonly used crushers suitable for limestone:
One is jaw crusher + impact crusher;
The second is jaw crusher + cone crusher + vertical shaft impact crusher;
The third is hammer crusher + impact crusher ;
Considering the requirements of rock characteristics and product proportion, choose a two-stage crushing scheme, which is jaw crusher + impact crusher combination form. The main feature of this combination is that the product particle size is good, the stone powder is small, with low total investment, low energy consumption, moderate noise and dust on the environment.
Main equipment
Primary crusher adopts a jaw crusher with capacity 680～880t/h( discharge opening is 200mm), and the installed power is 250kw.
Secondary crusher adopts 4 impact crushers with capacity 300～350t/h(discharge opening is 40mm) and the installed power of each impact crusher is 250kw.
Screening adopts two-stage vibrating screen. The first stage screening adopts 4 3ykr3075 circular vibrating screen and the secondary stage screening adopts 2 2ykr3075 circular vibrating screen.
The aggregate is stored in 4 16m steel plate storehouses with bulk delivery machines under the storehouses.
Belt conveyor and bucket elevator are selected for conveying massive materials, and chain conveyor is used for conveying powdery materials.
Process flow of the production plant
The process flow includes the following units:
(1) aggregate primary crushing and transportation;
(2) aggregate soil removal, screening and transportation;
(3) aggregate secondary crushing and transportation;
(4) aggregate primary screening and transportation;
(5) aggregate secondary screening and conveying;
(6) storage and delivery of finished products;
(7) powder conveying and bulk packing;
(8) compressed air station and pipe network;
(9) weighing system;
(10) water supply and processing unit;
(11) electrical automation system;
(12) spare parts and maintenance center;
Environmental protection
The environmental pollution of sand aggregate production mainly comes from dust pollution, water pollution and noise pollution. The production line uses a dry process, so there is basically no water pollution. And the noise pollution problems are mainly solved by measures such as soft connection and closed plants in the import and export of vibration equipment. Dust pollution is the main problem that needs to be solved.
1) in this project, the production unit that produces dust in primary crushing, secondary crushing, primary screening and secondary screening adopts closed design, and dust collecting air duct is set in each dust point.
2) the conveyor corridor of belt conveyor adopts fully enclosed design to ensure that the equipment is not affected in wind and rainy days, and will not cause dust from overflow and water pollution.
3) in the detail design of each production unit, the air leakage of equipment should be strictly controlled, and the unloading height of non-standard chute is shortened as far as possible under the condition of satisfying the unloading angle.
4) in the dust collector of secondary crushing and one or two screening units, a chain conveyor is set to transport powder, so that the dust discharged from dust collector does not enter the production system to cause secondary dust, and at the same time reduce the content of stone powder in aggregate products.
5) the powder is stored in the powder silo by conveyor and elevator. The powder bulk delivery system is set under the powder silo to deliver the powder out of the factory. The powder silo is equipped with a stone powder silo with a storage capacity of 100t. The delivery system is set at the bottom of the silo and dust is collected through the dust collector at the top of the silo. The finished aggregate warehouse is equipped with 4 steel plate storehouses with a storage capacity of 4000t. The bulk delivery system is set at the bottom of the warehouse, and the bulk machine collects dust through the dust collector at the top of the warehouse.
Production safety
The project is strictly designed according to safety production, such as jaw crusher, impact crusher and vibrating screen are arranged in the first floor of the mechanism unit. There are enough equipment maintenance space and clearance requirements, and the platform is surrounded by a protective railing. Plant layout consider the safety channel, each equipment elbow is set inspection channel and meets the net width requirements of safe production.
Summary
The production line basically meets the requirements of the design scheme, 20-31.5mm, 205t/h; 10-20 mm, 325 t/h; 5 - 10 mm, 186 t/h; 0 -5 mm, 280 t/h.
Due to the complexity of rock characteristics and on-site venues, the crushing equipment and combination forms of the aggregate production plant are different, product solutions and market positioning are also different, and each project has its own characteristics. A good production line is to meet the product requirements, good aggregate grain shape, the needle-shaped content meets the requirements, safe and reliable production, easy maintenance of equipment, energy saving and environmental protection, high automation, but also to save investment.