1. Chemical composition requirements for raw materials for the production of light calcium carbonate

Second, a brief description of the production process of light calcium carbonate

As the raw material is limestone calcium carbonate, calcined, digestion, purification of carbon dioxide gas, carbonization, dehydration, drying, screening, and packaging process produced product.

Due to the different production processes, different equipments and different control conditions, the product particle size and crystal form also have great differences, and their performances are also different.

At present, more than 90% of the light calcium carbonate produced in China is fine powder or fine calcium carbonate.

Limestone calcination

Limestone (block of 80 ~ 120mm) and crushed fuel (coke or anthracite, particle size 30 ~ 50 mm) after the measurement, a certain ratio charged liftpot, which was raised to the top of the kiln by The distributor is evenly distributed in the lime kiln, and the air is blown from the bottom of the kiln by the blower to reduce the fuel required for the decomposition of the limestone. Due to the countercurrent flow of fuel and limestone and air, three zones are formed from the top to the bottom in the lime kiln, namely the preheating zone at the top, the calcination reaction zone in the middle, and the cooling zone at the bottom. The reaction zone reacts as follows:

After the limestone is decomposed into calcium oxide and carbon dioxide, leaving the reaction zone, the kiln gas rises and the countercurrent material exchanges heat. The kiln gas leaving the top of the kiln is extracted by the air compressor, purified, washed and driven into the carbonization tower for neutralization reaction, leaving the reaction zone. The quicklime moving down transfers heat to the rising air, allowing the air to warm up. The final lime discharge temperature should be controlled below 60 °C. The quicklime enters the vibrating ash machine under the action of the machine, and the coal slag and ash powder are sieved out. The finished quicklime is sent into the silo by the conveyor.

Lime digestion

The quicklime in the ash silo is quantitatively added to the ashing machine through the feeder, and the ash is used for water (if the manufacturer has hot water, the hot ash is best), the quicklime reacts with water, and the reaction formula is as follows:

The reacted lime milk flows out of the ashing machine, and the slag is separated by a hydrocyclone and a linear vibrating screen. The lime milk is well refined and digested, and is put into the seminal plasma pool for storage.

Kiln gas purification

The kiln gas in the lime kiln is extracted by an air compressor or a Roots blower. The kiln gas is dedusted by a spray tower, the dust is removed by a foam washing tower, impurities dissolved in water are removed, and the organic impurities insoluble in water are washed away by a dry suction tower. The purified kiln gas is pressurized and compressed by an air compressor or a Roots blower, and then driven into a carbonization tower for carbonization reaction.

Carbonization reaction

The refined lime milk is pumped into the carbonization tower by the pump and controls a certain liquid level. The purified carbon dioxide gas is pressed into the carbonization tower by the air compressor or the Roots blower. Under the pressure of the gas, the lime milk and the carbon dioxide gas are The reaction in the tower produces calcium carbonate and water, and the reaction formula is as follows:

The reacted gas is discharged from the top of the carbonization tower, and the carbonized slurry is placed in a thickening tank for dehydration.

Dehydration

The carbonization reaction completes a good slurry. After enrichment, the pump is pumped into the high tank to enter the dewatering machine to remove the water, and the filter cake enters the dryer for drying.

dry

After the filter cake is crushed, it is sent to the disc feeder through the conveyor, and the material is evenly fed into the dryer by the disc feeder for drying.

Screen packaging

The calibrated material coming out of the dryer is smashed and sieved by a conveyor or bucket elevator to an air analyzer or a sieving machine. After the product is qualified, it is packed into the warehouse by metering.

production flow chart

Annual production of 10,000 tons of light calcium carbonate equipment name list

Calcination

Lime kiln

Option A

Steel lime vertical kiln 65m ³ 1 seat 950,000 yuan

Including: steel structure, lifting structure, six-point impact cloth system, vibrating ash machine, air blowing system, eleven-point temperature measuring device and electrical system, kiln body masonry. The foundation of the shaft kiln is responsible for the construction by the user.

Option B

Earth kiln 100m3 1 seat 660,000 yuan

Including: lifting system, injection system, blast system, vibrating ash machine, blast system, kiln building.

2. Kiln gas washing system 30m ³ /min 2 sets 75,000 yuan / set

Each set contains a washing tower, a spray tower and a dry suction tower.

Ash system

Rear-row ash machine Ø1300×13000 1 set 15.8 million

Electromagnetic feeder GZ3 1 set 0.600 yuan

Thick slurry tank Ø2500×3000 2 12,000 yuan/piece

Intermediate tank Ø2500×3000 1 12,000 yuan/piece

Pouring tank Ø2000×3000 2 pieces 1.0 million yuan/piece

Semen storage tank Ø4000×3000 4 12,000 yuan/piece

Hydrocyclone Ø150 5 sets 0.15 million yuan / Taiwan

Grey milk refining pump 4PN-9 4 sets 0.6 million yuan / Taiwan

Pour pump 4PN-9 4 sets 0.6 million yuan / Taiwan

Crude slag collection pool Ø2000×2500 1 piece 1.0 million yuan/piece

Linear vibrating screen 1000×2000 1 set 18,000 yuan/set

Lime silo Ø2500×4000 1 2 million yuan / month

Carbonization system

Carbonization tower Ø1200×11800 4 sets 32,000 yuan/set

Settling tank 3000 × 6000 × 2000 4 2 million yuan / month

Thick and mature slurry storage tank Ø3000×3000 2 12,000 yuan/piece

Air compressor 3L-1.5 2 sets 70,000 yuan / Taiwan

Or Roots blower 30 m3/min 2 sets

Dehydration system

Option A

Low speed centrifuge XR-1000 4 sets 32,000 yuan / Taiwan

Option B

High-speed centrifuge XR-1000-A 4 sets 4.5 million yuan / Taiwan

Equipment A and B must be equipped with equipment

Cooked pulp high level trough Ø2000×2500 1 2.0 million yuan/piece

Back pool 3000×6000×2000 4 yuan 2.0 million yuan

dry

Option A

Rotary dryer Ø1850×21150 1 set 350,000 yuan/set

Chain grate 4 tons 1 set 80,000 yuan / Taiwan

Option B

Tube Dryer XLGJ-188 (heat transfer oil) 1 set 3.6 million yuan / Taiwan

Oil boiler 1 set 160,000 yuan / Taiwan

Equipment A and B must be equipped with equipment

Filter cake crusher PS-350 1 set 0.55 million / Taiwan

Disc Feeder Ø1000 1 set 0.85 million / Taiwan

Screen packaging

Option A

Double-layer screening machine + bucket Lifter + packaging machine 1 set 55,000 yuan / set

Option B

Three-layer screening machine + bucket lifter + packaging machine 1 set of 65,000 yuan / set

Option C

Air analysis machine + bucket lifter + screw conveyor 1 set of 175,000 yuan / set

Description:

The above device configurations vary according to the process design, and the device selection varies.

Equipment quotes are valid for one month from the date of quote.

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