Impurity removal method for polycrystalline diamond micro-powder

Abstract

The invention belongs to the technical field of diamond micro-powder impurity removal, and particularly relates to a polycrystalline diamond micro-powder impurity removal method which comprises the following steps: step 1, acid adjustment: pouring a proper amount of water into a heating tank, then adding acid liquor, and uniformly stirring; step 2, primary pickling: weighing a proper amount of polycrystalline diamond micro-powder, pouring the polycrystalline diamond micro-powder into a heating tank, soaking, stirring by using a stirrer, and synchronously heating; and 3, purifying gas, namely collecting acid gas in the pickling process by using gas collecting equipment, discharging the acid gas into a neutralizing tower, spraying alkali liquor into the neutralizing tower, neutralizing the acid gas, purifying the gas by using gas purifying equipment, and finally discharging the gas. Impurity removal is repeatedly carried out on polycrystalline diamond micro-powder in a multi-time acid pickling and water washing mode, the impurity removal effect is improved, the acid-base neutralization effect is achieved by spraying alkaline water to acid gas in the neutralization tower, gas is purified through gas purification equipment, gas treatment is completed, and therefore pollution to the air environment is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of diamond micropowder impurity removal, and in particular relates to a method for removing impurities from polycrystalline diamond micropowder. Background Art

[0002] Polycrystalline diamond powder has high hardness and good wear resistance. It can be widely used in cutting, grinding, drilling, polishing, etc. It is an ideal raw material for grinding and polishing high-hardness materials such as cemented carbide, ceramics, gemstones, optical glass, etc. In the production process, diamond powder generally needs to go through four process steps: diamond crushing, diamond powder acid washing, diamond powder water washing, and diamond powder sorting.

[0003] At present, the impurity removal process of polycrystalline diamond powder is mostly carried out by pickling, and the pickling process is relatively simple, resulting in more impurities remaining in the polycrystalline diamond powder, reducing the impurity removal effect of the polycrystalline diamond powder. In addition, during the pickling process, acidic gas is easily generated, and it cannot be purified. It is directly discharged, which is easy to pollute the environment. Summary of the invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a method for removing impurities from polycrystalline diamond powder, which has the characteristics of improving the impurity removal effect and reducing pollution.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for removing impurities from polycrystalline diamond powder, comprising the following steps:

[0006] Step 1: Adjust the acid. Pour an appropriate amount of water into the heating tank, then add the acid solution and stir evenly.

[0007] Step 2: Initial pickling, weigh an appropriate amount of polycrystalline diamond powder, pour it into a heating tank, soak it, stir it with a stirrer, and heat it simultaneously;

[0008] Step 3: Gas purification: Use gas collection equipment to collect the acidic gas in the pickling process and discharge it into a neutralization tower. Alkaline solution is sprayed in the neutralization tower to neutralize the acidic gas. Then, the gas is purified by gas purification equipment and finally discharged.

[0009] Step 4: washing with water, taking out the polycrystalline diamond powder after acid washing in step 2, pouring it into a filter basket for washing with water, and removing the acid solution attached to the surface of the polycrystalline diamond powder;

[0010] Step 5: Pickling again, repeating steps 2 to 4 for multiple times;

[0011] Step 6: Drying: Take out the polycrystalline diamond powder in step 5 and wash it again with water, then put it into a drying device to dry the polycrystalline diamond powder.

[0012] Preferably, in step 1, the ratio of water to acid solution is 1:2, and the stirring method is stirring while adding the acid solution.

[0013] Preferably, the soaking time in step 2 is 5-10 minutes, and the heating and stirring time is 30-40 minutes.

[0014] Preferably, the water washing method in step 4 is soaking first and then rinsing, the soaking time is 5-8 minutes, and the rinsing time is 8-12 minutes.

[0015] Preferably, the drying time in step six is ​​20-30 minutes.

[0016] Preferably, the acid solution in step one is sulfuric acid, and the alkali solution in step three is sodium hydroxide.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention repeatedly removes impurities from polycrystalline diamond powder by acid washing and water washing for many times, thereby improving the impurity removal effect. By spraying alkaline water on the acidic gas in the neutralization tower, the acid-base neutralization effect is achieved. Then, the gas is evolved by the gas purification equipment to complete the gas treatment, thereby avoiding air pollution. By using a heating tank for acid washing, synchronous heating accelerates the reaction, thereby improving the acid washing efficiency. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example 1

[0021] The present invention provides the following technical solution: a method for removing impurities from polycrystalline diamond powder, comprising the following steps:

[0022] Step 1: Adjust the acid. Pour an appropriate amount of water into the heating tank, then add the acid solution and stir evenly.

[0023] Step 2: Initial pickling, weigh an appropriate amount of polycrystalline diamond powder, pour it into a heating tank, soak it, stir it with a stirrer, and heat it simultaneously;

[0024] Step 3: Gas purification: Use gas collection equipment to collect the acidic gas in the pickling process and discharge it into a neutralization tower. Alkaline solution is sprayed in the neutralization tower to neutralize the acidic gas. Then, the gas is purified by gas purification equipment and finally discharged.

[0025] Step 4: washing with water, taking out the polycrystalline diamond powder after acid washing in step 2, pouring it into a filter basket for washing with water, and removing the acid solution attached to the surface of the polycrystalline diamond powder;

[0026] Step 5: Pickling again, repeating steps 2 to 4 for multiple times;

[0027] Step 6: Drying: Take out the polycrystalline diamond powder in step 5 and wash it again with water, then put it into a drying device to dry the polycrystalline diamond powder.

[0028] Specifically, in step 1, the ratio of water to acid solution is 1:1.4, and the stirring method is stirring while adding the acid solution.

[0029] Specifically, the soaking time in step 2 is 5 minutes, and the heating and stirring time is 30 minutes.

[0030] Specifically, in step 4, the water washing method is soaking first and then rinsing, the soaking time is 5 minutes, and the rinsing time is 8 minutes.

[0031] Specifically, the drying time in step six is ​​20 minutes.

[0032] Specifically, the acid solution in step one is sulfuric acid, and the alkali solution in step three is sodium hydroxide.

[0033] Example 2

[0034] The present invention provides the following technical solution: a method for removing impurities from polycrystalline diamond powder, comprising the following steps:

[0035] Step 1: Adjust the acid. Pour an appropriate amount of water into the heating tank, then add the acid solution and stir evenly.

[0036] Step 2: Initial pickling, weigh an appropriate amount of polycrystalline diamond powder, pour it into a heating tank, soak it, stir it with a stirrer, and heat it simultaneously;

[0037] Step 3: Gas purification: Use gas collection equipment to collect the acidic gas in the pickling process and discharge it into a neutralization tower. Alkaline solution is sprayed in the neutralization tower to neutralize the acidic gas. Then, the gas is purified by gas purification equipment and finally discharged.

[0038] Step 4: washing with water, taking out the polycrystalline diamond powder after acid washing in step 2, pouring it into a filter basket for washing with water, and removing the acid solution attached to the surface of the polycrystalline diamond powder;

[0039] Step 5: Pickling again, repeating steps 2 to 4 for multiple times;

[0040] Step 6: Drying: Take out the polycrystalline diamond powder in step 5 and wash it again with water, then put it into a drying device to dry the polycrystalline diamond powder.

[0041] Specifically, in step 1, the ratio of water to acid solution is 1:1.5, and the stirring method is stirring while adding the acid solution.

[0042] Specifically, the soaking time in step 2 is 7 minutes, and the heating and stirring time is 35 minutes.

[0043] Specifically, in step 4, the water washing method is soaking first and then rinsing, the soaking time is 8 minutes, and the rinsing time is 8 minutes.

[0044] Specifically, the drying time in step six is ​​25 minutes.

[0045] Specifically, the acid solution in step one is sulfuric acid, and the alkali solution in step three is sodium hydroxide.

[0046] Example 3

[0047] The present invention provides the following technical solution: a method for removing impurities from polycrystalline diamond powder, comprising the following steps:

[0048] Step 1: Adjust the acid. Pour an appropriate amount of water into the heating tank, then add the acid solution and stir evenly.

[0049] Step 2: Initial pickling, weigh an appropriate amount of polycrystalline diamond powder, pour it into a heating tank, soak it, stir it with a stirrer, and heat it simultaneously;

[0050] Step 3: Gas purification: Use gas collection equipment to collect the acidic gas in the pickling process and discharge it into a neutralization tower. Alkaline solution is sprayed in the neutralization tower to neutralize the acidic gas. Then, the gas is purified by gas purification equipment and finally discharged.

[0051] Step 4: washing with water, taking out the polycrystalline diamond powder after acid washing in step 2, pouring it into a filter basket for washing with water, and removing the acid solution attached to the surface of the polycrystalline diamond powder;

[0052] Step 5: Pickling again, repeating steps 2 to 4 for multiple times;

[0053] Step 6: Drying: Take out the polycrystalline diamond powder in step 5 and wash it again with water, then put it into a drying device to dry the polycrystalline diamond powder.

[0054] Specifically, in step 1, the ratio of water to acid solution is 1:1.8, and the stirring method is stirring while adding the acid solution.

[0055] Specifically, the soaking time in step 2 is 9 minutes, and the heating and stirring time is 38 minutes.

[0056] Specifically, in step 4, the water washing method is soaking first and then rinsing, the soaking time is 9 minutes, and the rinsing time is 11 minutes.

[0057] Specifically, the drying time in step six is ​​28 minutes.

[0058] Specifically, the acid solution in step one is sulfuric acid, and the alkali solution in step three is sodium hydroxide.

[0059] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for removing impurities from polycrystalline diamond powder, comprising the following steps: Features: Step 1: Adjust the acid. Pour an appropriate amount of water into the heating tank, then add the acid solution and stir evenly. Step 2: Initial pickling, weigh an appropriate amount of polycrystalline diamond powder, pour it into a heating tank, soak it, stir it with a stirrer, and heat it simultaneously; Step 3: Gas purification: Use gas collection equipment to collect the acidic gas in the pickling process and discharge it into a neutralization tower. Alkaline solution is sprayed in the neutralization tower to neutralize the acidic gas. Then, the gas is purified by gas purification equipment and finally discharged. Step 4: washing with water, taking out the polycrystalline diamond powder after acid washing in step 2, pouring it into a filter basket for washing with water, and removing the acid solution attached to the surface of the polycrystalline diamond powder; Step 5: Pickling again, repeating steps 2 to 4 for multiple times; Step 6: Drying: Take out the polycrystalline diamond powder in step 5 and wash it again with water, then put it into a drying device to dry the polycrystalline diamond powder.

2. A method for removing impurities from polycrystalline diamond powder according to claim 1, Features: In the step 1, the ratio of water to acid solution is 1:2, and the stirring method is stirring while adding the acid solution.

3. The method for removing impurities from polycrystalline diamond powder according to claim 1, Features: The soaking time in step 2 is 5-10 minutes, and the heating and stirring time is 30-40 minutes.

4. The method for removing impurities from polycrystalline diamond powder according to claim 1, Features: The water washing method in step 4 is soaking first and then rinsing, the soaking time is 5-8 minutes, and the rinsing time is 8-12 minutes.

5. The method for removing impurities from polycrystalline diamond powder according to claim 1, Features: The drying time in step six is ​​20-30 minutes.

6. The method for removing impurities from polycrystalline diamond powder according to claim 1, Features: The acid solution in step one is sulfuric acid, and the alkali solution in step three is sodium hydroxide.