Guangzhou Huadu District Sand Washing Production Line

Technical Requirements:

1. Raw materials are foundation soil and shield tunneling material.
2. The mud to sand ratio of raw materials is 1 to 1;
3. Hourly output requirement is 200t/h.

Based on the above data, the following production line, process flow, and related data are formulated as follows:

Water volume and equipment configuration: excluding conveyor belts

The water consumption of this production line is about 400m³/h.

Process flow overview:

Raw materials are conveyed from the feed hopper by conveyor belt to the distributor, which divides into two to two horizontal vibrating screens. Meanwhile, about 20% (from the clean water pool) of clean water and about 80% (from the XS6000 impeller sand washer and ZS2430 dehydration screen) water are flushed into the two horizontal vibrating screens. Through excitation and washing by the horizontal vibrating screens, foreign matter and stones are separated, and sand along with sewage enters one 2LH1575 double spiral sand washer. After scrubbing by the spiral sand washer and dehydration by the ZS2424 dehydration screen, the material enters an added water tank. The overflow trough on the side of the spiral sand washer overflows mud and sand water, which together with the dehydration screen's mud and sand water enters the BT800 fine sand recovery machine. After dehydration by the fine sand recovery machine, sewage is directed by a cyclone to the sewage pool, and fine sand after dehydration goes to the added water tank. At this point, the mud content in the finished sand and fine sand in the water tank is reduced to about 10%. The water tank is injected with 80% (from the clean water pool) clean water to flush to the XSφ6000 impeller sand washer. Through rotation, washing, and scooping by the impeller sand washer, the material is dehydrated by the ZS2430 dehydration screen to obtain finished sand. The overflow water from the water wheel and the dehydration screen is pumped to the two horizontal vibrating screens to wash the raw materials.

Process flow advantages:

Fine sand recovery rate is 95%, finished sand mud content is 1%~2%, sand moisture content is 5%, stone powder moisture content is within 10%, and the washed sand grading fineness modulus meets the national "Construction Sand" standard.

2. The entire process water circuit design is ingenious and efficient, with about 80% of the water volume recycled and reused twice, washing out the maximum amount of finished sand with the minimum amount of clean water, resulting in a small amount of sewage; this saves materials, time, and labor for sewage treatment, greatly reducing sewage treatment costs.

3. High-quality and efficient equipment with ingenious process design. The output of a single piece of equipment in the entire process can reach the output of 2 or even more pieces of equipment on the market; equipment is simple and the amount of equipment investment is reduced, which can reduce infrastructure construction. The initial construction period is shortened; during normal operation, labor input is reduced, equipment maintenance and upkeep are convenient, and the construction period is short. Truly achieving low cost and high output.