A dynamic rinsing method for quartz sand after pickling

Abstract

The present invention belongs to the technical field of quartz sand washing, and particularly relates to a dynamic rinsing method for quartz sand after pickling. For a paste formed after pickling of quartz sand raw materials with a high content of Ca as an impurity, a multi-stage dynamic water washing and solid-liquid separation method is adopted, and four thickeners and one rinsing bucket are used to ensure that the final ton bag of quartz sand products must overflow from the overflow trough on the top of the previous water washing device before being discharged from the sand outlet at the bottom of the thickener. Moreover, all the final ton bags of quartz sand products have undergone at least two rounds of washing and solid-liquid separation, and at most four rounds of washing and solid-liquid separation, to ensure that the obtained quartz sand products can be efficiently washed and solid-liquid separated.

Description

Technical Field

[0001] The invention belongs to the technical field of quartz sand washing, and in particular relates to a dynamic rinsing method for quartz sand after acid washing. Background Art

[0002] After pickling, quartz sand must be washed with water and separated into solid and liquid to obtain quartz sand products. In the conventional water washing process, quartz sand raw materials with less Ca elements as impurities only need to be washed once. However, in the actual production process, quartz sand raw materials with more Ca elements as impurities cannot be cleaned in one water washing. The reason is that if the impurities contain more Ca elements, HCl must be used during pickling, which will inevitably cause the sand to become hardened and difficult to separate from the solid and liquid after pickling. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention provides a dynamic rinsing method for quartz sand after pickling. This method can efficiently clean and separate the solid-liquid paste formed after pickling of quartz sand raw materials containing a high amount of Ca. The specific technical solution employed is a dynamic rinsing method for quartz sand after pickling, wherein the raw material to be rinsed includes at least quartz sand that has been pickled in a pickling tank, and comprises the following steps:

[0004] Step 1: The pickled quartz sand enters the feed barrel of the first thickener. After the first rinsing and solid-liquid separation in the first thickener, the mixed liquid overflowing from the overflow trough at the top of the first thickener is transported to the feed barrel of the second thickener, and the slurry discharged from the sand outlet at the bottom of the first thickener is transported to the rinsing bucket.

[0005] Step 2: The slurry transported to the rinsing tank in step 1 is rinsed for the second time and undergoes solid-liquid separation in the rinsing tank. The mixed liquid overflowing from the overflow tank at the top of the rinsing tank is transported to the feed barrel of the third thickener, and the slurry discharged from the sand discharge valve at the bottom of the rinsing tank is transported to the sand pumping pool;

[0006] Step 3: After the mixed liquid transported to the third thickener in step 2 undergoes a third rinsing and solid-liquid separation in the third thickener, the liquid overflowing from the overflow trough at the top of the third thickener is transported to the clear water tank, and the quartz sand discharged from the sand outlet at the bottom of the third thickener is packed into tons;

[0007] Step 4: The mortar transported to the sand pumping pool in step 2 is pumped into the water filter tank and dryer for processing;

[0008] Step 5: After the mixed liquid transported to the feed barrel of the second thickener in step 1 undergoes a second rinsing and solid-liquid separation in the second thickener, the mixed liquid overflowing from the overflow trough at the top of the second thickener is transported to the thickening tank, and the quartz sand discharged from the sand outlet at the bottom of the second thickener is packed into tons;

[0009] Step 6: The mixed liquid transported to the thickening tank in step 5 is naturally settled in the thickening tank for the third solid-liquid separation. The liquid overflowing from the overflow trough at the top of the thickening tank is transported to the clear water tank, and the slurry discharged from the sand outlet at the bottom of the thickening tank is pumped into the fourth thickening hopper;

[0010] Step 7: After the mixed liquid transported to the fourth thickener in step 6 undergoes the fourth rinsing and solid-liquid separation in the fourth thickener, the liquid overflowing from the overflow trough at the top of the fourth thickener is transported to the thickening tank, and steps 6 and 7 are repeated; the slurry discharged from the sand outlet at the bottom of the fourth thickener is pumped into the filter press through a plunger pump, and the quartz sand obtained after treatment by the filter press is packed in tons.

[0011] Moreover, the quartz sand after pickling in step 1 is discharged from the discharge port of the pickling tank into the sand pool, and then pumped into the first thickener by a slurry pump.

[0012] Moreover, the clean water inlet of the rinsing tub in step 2 is located at the bottom of the rinsing tub.

[0013] Moreover, the clean water tank in step 3 is used to provide clean water for spraying the pickling tank and the clean water required for the operation of the first thickener, the second thickener, the third thickener, the fourth thickener and the rinsing bucket.

[0014] Compared with the existing technology, the beneficial effects of this technical solution are:

[0015] 1. For the paste formed after acid washing of quartz sand raw materials with high impurity content of Ca, a multi-stage dynamic water washing and solid-liquid separation method is adopted. Four thickeners and one rinsing bucket are used to ensure that the final ton bag of quartz sand products must overflow from the overflow tank at the top of the previous water washing device before being discharged from the sand outlet at the bottom of the thickener, thereby ensuring that the ton bag of quartz sand products has been cleaned;

[0016] 2. The quartz sand products produced by this method have undergone at least two rounds of rinsing and solid-liquid separation, and some products have undergone four or even more rounds of rinsing and solid-liquid separation to ensure that the obtained quartz sand products can be efficiently washed and solid-liquid separated.

[0017] 3. Since the number of water washing devices involved is greater than that of conventional methods, water conservation is necessary. In this method, the water in all water washing devices can be recycled, and there is no problem of wasting water resources or polluting wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a process flow chart of the present method, in which the arrows indicate the transportation direction of the relevant raw materials or water;

[0019] Figure 2 This is the process flow chart of the first thickening hopper, the second thickening hopper, the third thickening hopper and the rinsing barrel.

[0020] Description of reference numerals:

[0021] Pickling tank 1, feed tube 2 for the first thickener, first thickener 3, feed tube 4 for the second thickener, second thickener 5, rinsing tank 6, feed tube 7 for the third thickener, sand pumping tank 8, clean water tank 9, filter tank and dryer 10, thickener 11, fourth thickener 12, filter press 13, mortar pump 14, ton bag 15, third thickener 16, overflow trough 17, sand outlet 18. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the following embodiments.

[0023] A dynamic rinsing method for quartz sand after pickling, the process flow chart is as follows Figure 1 As shown, the rinsed raw material includes at least quartz sand pickled in the pickling tank 1, and the steps include:

[0024] Step 1: The pickled quartz sand is discharged from the pickling tank outlet into the sand pool and then pumped into the feed barrel 2 of the first thickener by a slurry pump. After the first rinsing and solid-liquid separation in the first thickener 3, the mixed liquid overflowing from the overflow trough 17 at the top of the first thickener is transported to the feed barrel 4 of the second thickener. The slurry discharged from the sand outlet 18 at the bottom of the first thickener is transported to the rinse barrel 6. The clean water inlet of the rinse barrel is located at the bottom of the rinse barrel. The rinse barrel has a feed inlet with a similar structure to the feed barrel of the thickener.

[0025] Step 2: The slurry transported to the rinsing tank in step 1 undergoes a second rinse and solid-liquid separation in the rinsing tank 6. The mixed liquid overflowing from the overflow tank at the top of the rinsing tank is transported to the feed tube 7 of the third thickener, and the slurry discharged from the sand discharge valve at the bottom of the rinsing tank is transported to the sand pumping tank 8.

[0026] Step 3: After the mixed liquid transported to the third thickener 16 in step 2 undergoes a third rinsing and solid-liquid separation in the third thickener, the liquid overflowing from the overflow trough at the top of the third thickener is transported to the clean water tank 9, and the quartz sand discharged from the sand outlet at the bottom of the third thickener is packed into ton bags;

[0027] Step 4: The mortar transported to the sand pumping pool in step 2 is pumped into the water filter tank and the dryer 10 for processing;

[0028] Step 5: After the mixed liquid transported to the feed barrel of the second thickener in step 1 undergoes a second rinsing and solid-liquid separation in the second thickener 5, the mixed liquid overflowing from the overflow trough at the top of the second thickener is transported to the thickener tank 11, and the quartz sand discharged from the sand outlet at the bottom of the second thickener is packed into ton bags;

[0029] Step 6: The mixed liquid transported to the thickening tank in step 5 is naturally settled in the thickening tank for the third solid-liquid separation. The liquid overflowing from the overflow trough at the top of the thickening tank is transported to the clear water tank, and the slurry discharged from the sand outlet at the bottom of the thickening tank is pumped into the fourth thickening hopper 12 through the mortar pump 14;

[0030] Step 7: After the mixed liquid transported to the fourth thickener in step 6 undergoes a fourth rinse and solid-liquid separation in the fourth thickener, the liquid overflowing from the overflow trough at the top of the fourth thickener is transported to the thickening tank, and steps 6 and 7 are repeated; the slurry discharged from the sand outlet at the bottom of the fourth thickener is pumped into the filter press 13 through a plunger pump, and the quartz sand obtained after treatment by the filter press is packed in tons 15.

[0031] Moreover, the clean water tank described in step 3 is used to provide spray water for the pickling tank and the clean water required for the operation of the first thickener, the second thickener, the third thickener, the fourth thickener and the rinsing bucket. There is an appropriate amount of alkaline solution in the clean water tank to neutralize the residual acid entering the clean water tank after the quartz sand is washed.

[0032] After dynamic rinsing by this method, all final quartz sand products in the ton bag must overflow from the overflow tank at the top of the previous water washing device before being discharged from the sand outlet at the bottom of the thickening hopper. That is, the quartz sand produced by the second thickening hopper of the ton bag comes from the mixed liquid overflowing from the overflow tank at the top of the first thickening hopper, the quartz sand produced by the third thickening hopper of the ton bag comes from the mixed liquid overflowing from the overflow tank at the top of the rinsing barrel, and the quartz sand produced by the fourth thickening hopper of the ton bag comes from the mixed liquid overflowing from the overflow tank at the top of the thickening tank. Therefore, it can be ensured that the final quartz sand products in the ton bag have been washed and the solid-liquid separation has been achieved.

[0033] In addition, the particle size of the product obtained in step 4 may be coarser than the particle size of the quartz sand produced in the bulk bags in steps 3, 5 and 7. Therefore, the product produced in step 4 needs to be stored separately from the aforementioned bulk bag products.

[0034] Because the quartz sand raw materials with a lot of Ca elements in the impurities will become hardened and sticky after pickling, forming a paste that is difficult to clean and difficult to separate from the solid and liquid, so this method adopts a dynamic rinsing method that can perform multiple rounds of cleaning and solid-liquid separation. The quartz sand produced by the second thickener undergoes two rounds of rinsing and solid-liquid separation in the first thickener and the second thickener. The quartz sand produced by the third thickener undergoes three rounds of rinsing and solid-liquid separation in the first thickener, the rinsing tank and the third thickener. The quartz sand produced by the fourth thickener undergoes four rounds of rinsing and solid-liquid separation in the first thickener, the second thickener, the thickening tank and the fourth thickener. If steps 6 and 7 are repeated, more rounds of rinsing and solid-liquid separation will be performed to ensure that the final ton bag of quartz sand products has been washed and the solid-liquid separation has been completed.

[0035] Compared with the existing technology, the beneficial effects of this technical solution are:

[0036] 1. For the paste formed after acid washing of quartz sand raw materials with high Ca content, a multi-stage dynamic water washing and solid-liquid separation method is adopted. Four thickeners and one rinsing bucket are used to ensure that the final ton bag of quartz sand products must overflow from the overflow tank at the top of the previous water washing device before being discharged from the sand outlet at the bottom of the thickener, thereby ensuring that the ton bag of quartz sand products has been cleaned.

[0037] 2. The quartz sand products produced by this method have undergone at least two rounds of rinsing and solid-liquid separation, and some products have undergone four or even more rounds of rinsing and solid-liquid separation to ensure that the obtained quartz sand products can be efficiently washed and solid-liquid separated.

[0038] 3. Since the number of water washing devices involved is greater than that of conventional methods, water conservation is necessary. In this method, the water in all water washing devices can be recycled, and there is no problem of wasting water resources or polluting wastewater.

Claims

1. A dynamic rinsing method for quartz sand after pickling, wherein the raw material to be rinsed comprises at least quartz sand after pickling in a pickling tank, characterized in that: The quartz sand impurities contain Ca elements, and the quartz sand after being pickled with HCl is agglomerated to form a paste, comprising the following steps: Step 1: The pickled quartz sand enters the feed barrel of the first thickener. After the first rinsing and solid-liquid separation in the first thickener, the mixed liquid overflowing from the overflow trough at the top of the first thickener is transported to the feed barrel of the second thickener, and the slurry discharged from the sand outlet at the bottom of the first thickener is transported to the rinsing bucket. Step 2: The slurry transported to the rinsing tank in step 1 is rinsed for the second time and undergoes solid-liquid separation in the rinsing tank. The mixed liquid overflowing from the overflow tank at the top of the rinsing tank is transported to the feed barrel of the third thickener, and the slurry discharged from the sand discharge valve at the bottom of the rinsing tank is transported to the sand pumping pool; Step 3: After the mixed liquid transported to the third thickener in step 2 undergoes a third rinsing and solid-liquid separation in the third thickener, the liquid overflowing from the overflow trough at the top of the third thickener is transported to the clear water tank, and the quartz sand discharged from the sand outlet at the bottom of the third thickener is packed into tons; Step 4: The mortar transported to the sand pumping pool in step 2 is pumped into the water filter tank and dryer for processing; Step 5: After the mixed liquid transported to the feed barrel of the second thickener in step 1 undergoes a second rinsing and solid-liquid separation in the second thickener, the mixed liquid overflowing from the overflow trough at the top of the second thickener is transported to the thickening tank, and the quartz sand discharged from the sand outlet at the bottom of the second thickener is packed into ton bags; Step 6: The mixed liquid transported to the thickening tank in step 5 is naturally settled in the thickening tank for the third solid-liquid separation. The liquid overflowing from the overflow trough at the top of the thickening tank is transported to the clear water tank, and the slurry discharged from the sand outlet at the bottom of the thickening tank is pumped into the fourth thickening hopper; Step 7: After the mixed liquid transported to the fourth thickener in step 6 undergoes the fourth rinsing and solid-liquid separation in the fourth thickener, the liquid overflowing from the overflow trough at the top of the fourth thickener is transported to the thickening tank, and steps 6 and 7 are repeated; the slurry discharged from the sand outlet at the bottom of the fourth thickener is pumped into the filter press through a plunger pump, and the quartz sand obtained after treatment by the filter press is packed in tons.

2. The dynamic rinsing method for quartz sand after pickling according to claim 1, characterized in that: The quartz sand after pickling in step 1 is discharged from the discharge port of the pickling tank into the sand pool, and then pumped into the first thickener by a slurry pump.

3. The dynamic rinsing method for quartz sand after pickling according to claim 1, characterized in that: The clean water inlet of the rinsing bucket in step 2 is located at the bottom of the rinsing bucket.

4. The dynamic rinsing method for quartz sand after pickling according to claim 1, characterized in that: The clean water tank described in step 3 is used to provide clean water for spraying the pickling tank and the clean water required for the operation of the first thickener, the second thickener, the third thickener, the fourth thickener and the rinse bucket.

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