NAV

1、 D401, D402 iminodiacetic acid resin and D402-II amino phosphonic acid resin
1. Physical and chemical performance indicators of D401, D402, and D402-II chelating resins

resin	D401	D402			D402-II
Functional groups	iminodiacetic acid			Amino phosphonic acid
Moisture content%	52 - 58	52 - 58			55-65
Mass exchange volume mmol/g	1.95（Chelated copper）	1.45（Chelated calcium）			1.45（Chelated calcium）
Volume exchange capacity mmol/ml	0.6（Chelated copper）	0.5（Chelated calcium）			0.5（Chelated calcium）
Wet apparent density g/ml	0.72 -0.78
Wet true density g/ml	1.15 -1.25
Particle size range（0.4-1.25mm）	≧95%
Effective particle size mm	0.4-0.7
Transformation expansion rate（H→Na）	≦40%
PH usage range	3-12
Optimal pH range	8-9
Maximum operating temperature	80℃
Factory ion type	Na
appearance	Milk white to light yellow round ball		Light gray or light yellow ball

2. Scope of use
2.1. Although D401 and D402 are both iminoacetic acid chelating resins, their preparation processes and prices vary. D402-II is an amino phosphonic acid chelating resin. These three resins can selectively adsorb alkaline earth metal ions (calcium, magnesium, strontium, barium, etc.) and other divalent and above metal ions from salt solutions of alkali metals (lithium sodium potassium, etc.). The most common use of this type of chelating resin is the softening and refining of secondary brine in the chlor alkali industry, which can reduce the total content of calcium, magnesium, and iron in the brine to less than 20ug/l.
2.2. Due to the greater difference in metal ion selectivity of iminodiacetic acid chelating resins, D401 and D402 can also be used for separating transition metals such as copper and nickel from base metals.
3. The usage methods of the three resins are similar, and they are briefly described as follows:
3.1. Install the resin into the exchange column according to the design amount (note that the minimum height of the resin should not be less than 800mm).
3.2. Inject clean water to backwash the resin, and control the flow rate to achieve a resin backwash development rate of 75-100% (backwash flow rate is about 10-15m/h), lasting for about 10-20min until the effluent is clear and free of impurities.
3.3. Stop backwashing and allow the resin to settle naturally. Then adjust the water level in the exchange column to 20-30cm above the resin layer.
3.4. Inject 3-4% HCl solution 2-3 times the resin volume, and complete the process in about 1 hour. (It is best to prepare acid solution with desalinated water).
3.5. Continue to replace the resin with desalinated water at the same flow rate until the effluent pH reaches 4-5.
3.6. Inject 4-3BV of 4-5% NaOH at the same speed and complete the process in about 1 hour. It is best to prepare alkaline solution with desalinated water.
3.7. Continue to introduce desalinated water at the same speed for replacement, with a time of approximately 60 minutes.
3.8. Then, continue to clean the resin with desalinated water at the operating flow rate (10-30m/h) until the pH is 8-9, and it can be put into operation.
3.9. After the resin fails, repeat the operation described in 3.2-3.8 above for regeneration.
3.10 Description:
Sometimes resins are used for the recovery of certain metals, and in step 3.4, higher concentrations of sulfuric acid (such as 10-15%) can be used to obtain higher concentrations of metal sulfates.
2、 D403 boron selective resin
1. Physical and chemical performance indicators of D403 boron selective resin

resin	D403	D403-II
Functional groups	Meglumine	Meglumine
moisture content%	52 -60	52 -60
Mass exchange volume mmmol/g	≧2.7	≧2.7
Volume exchange capacity mmol/ml	0.9	0.9
Wet apparent density g/ml	0.70 -0.76	0.70 -0.76
Wet true density g/ml	1.08 -1.18	1.08 -1.18
Particle size range （0.4-1.25mm）	≧95%
Effective particle size mm	0.4 -0.7
Transformation expansion rate （OH→Cl）	≦40%	≦10%
PH applicable range	≧6
PH applicable range	8-10
Maximum operating temperature	60℃
Factory ion type	Free amine type
appearance	Milk white or light yellow ball

2. Scope of use:
Methylamine based resins can selectively adsorb and enrich boron from fresh water, seawater, or brine for environmental protection or borate production. It can also be used for selective removal of boron in high-purity water. This type of resin adsorbs boron in a slightly alkaline medium and resolves it under acidic conditions. Then convert the resin to a free amine type before use.
The production processes of D403 and D403-II differ, with the former having lower costs and the latter having higher costs. But the latter has a larger adsorption capacity for boron and a lower leakage of boron.
3. The pre-treatment and usage methods are as follows:
3.1. Install the resin into the exchange column according to the design amount (note that the minimum height of the resin should not be less than 800mm).
3.2. Inject clean water to backwash the resin and control the flow rate to achieve a resin backwash development rate of 75-100% (backwash flow rate is about 10-15m/h), lasting for about 10-20 minutes until the effluent is clear and free of impurities.
3.3. Stop backwashing and allow the resin to settle naturally. Then adjust the water level in the exchange column to 20-30cm above the resin layer.
3.4. Inject 3-4% HCl, which is twice the volume of the resin, in approximately one hour.
3.5. Continue to rinse the resin with clean water at the same rate until the effluent pH reaches 3-4. It takes about 1 hour and uses approximately 2-3BV of water.
3.6. Inject 4BV of 4-5% NaOH at the same speed and complete the process in about 1 hour.
3.7. Continue to inject clean water at the same speed for replacement, with a time of approximately 1 hour and a water consumption of approximately 2BV.
3.8. Then continue to rinse the resin with clean water at the operating flow rate (10-30m/h) until the pH is 8-9, and it can be put into operation.
3.9. When the resin fails and requires regeneration, repeat the operations mentioned in 3.2-3.8 above. If it is required that the pH of the effluent does not significantly increase compared to the inflow, for D403-II, after step 3.7, a 5-6% NaCl solution of 1BV is first introduced, and then continue with step 3.8.
3.10. If the resin is used for the enrichment production of boron products, a higher concentration of sulfuric acid (such as 10-15%) can be used in step 3.4 to obtain a higher concentration of boric acid. You can also reuse the previous acid solution to increase the boric acid content in the solution. Then, add some fresh acid solution for thorough analysis.
3、 D405 mercury selective resin
1. Physical and chemical performance indicators of D405 mercury selective resin

resin	D405
Functional groups	sulfydryl
moisture content%	45-50
Mass exchange volume mmol/g	/
Volume exchange capacity mmol/ml	≧0.8（Hg2+）
Wet apparent density g/ml	0.72 -0.78
Wet true density g/ml	1.02 -1.08
Particle size range （0.4-1.25mm）	≧95%
Effective particle size mm	0.4-0.7
Transformation expansion rate	/
Maximum operating temperature	80℃
Factory ion type	H
appearance	Light yellow ball

2. Scope of use:
D405 mercury selective resin can adsorb various forms of organic and inorganic mercury. Due to its strong adsorption capacity and large adsorption capacity for mercury, it is particularly suitable for the precision treatment of mercury containing wastewater. The mercury content in water treated with D405 can reach undetectable levels.
3. Usage:
D405 resin, which absorbs mercury, can thoroughly analyze mercury with concentrated hydrochloric acid. After washing with water, the resin can be reused. However, due to the high toxicity of mercury, the analyzed mercury containing waste liquid requires special treatment. It's very inconvenient. Therefore, the general treatment plan for mercury containing wastewater is:
1. If the mercury content in the wastewater is high, such as at the mg/l level or higher, Na2S can be used to precipitate the mercury in the wastewater first. After filtration, the mercury content in water can generally reach several tens μ G/l level. Solid waste containing mercury will be treated separately.
2、 μ Wastewater with a mercury content of g/l enters the D405 adsorption column for mercury adsorption. The flow rate is 5-10BV/h.
3. The adsorption is carried out using a double column series connection method. When mercury leakage is detected in the second column, replace the resin in the first column with new resin and make it the second column. The original second column will be changed to the first column, and then continue to operate. The used resin absorbs mercury and, together with the solid waste containing mercury, directly goes to the landfill for mercury containing waste treatment.
It seems that D405 resin is not economical to use at once. However, due to the unique nature of mercury, coupled with the pretreatment of wastewater with Na2S, the mercury content in the wastewater has decreased to μ After the g/l level, the treatment efficiency of the resin for wastewater can generally reach tens of thousands or hundreds of thousands of times its own volume. Therefore, this treatment scheme is actually the most convenient and cost-effective.
3、 D405-II Precious Metal Adsorption Resin
1. Physical and chemical performance indicators of D405-II precious metal adsorption resin

resin	D405-II
Functional groups	Thiourea group
moisture content%	52 -60
Mass exchange volume mmol/g	/
Volume exchange capacity mmol/ml	≧1.0
Wet apparent density g/ml	0.65 -0.77
Wet true density g/ml	1.03 -1.10
Particle size range （0.4-1.25mm）	≧95%
Effective particle size mm	0.4-0.7
Transformation expansion rate	/
PH applicable range	≦6
Maximum operating temperature	≦80℃
Factory ion type	Cl
appearance	Milk white or light yellow ball

2. Usage:
2.1. D405-II resin contains thiourea functional groups and has strong adsorption ability for precious metals, especially platinum and palladium. But this resin is unstable to alkali and can only be used in slightly acidic environments.
2.2. Due to the high price of the metals adsorbed by D405-II, resins are often disposable. That is, the resin saturated with precious metals is directly burned in the incinerator to recover precious metals.
5、 D406 fluorine selective resin
1. Physical and chemical performance indicators of D406 fluorine selective resin

resin	D406
Functional groups	Al
moisture content%	50 -55
Mass exchange volume mmol/g	1.5
Volume exchange capacity mmol/ml	0.5
Wet apparent density g/ml	0.72 -0.80
Wet true density g/ml	1.15 -1.25
Particle size range （0.4-1.25mm）	≧95%
Effective particle size mm	0.4-0.7
Transformation expansion rate	/
PH applicable range	5-9
Maximum operating temperature	80℃
Factory ion type	Al
appearance	Light gray or light yellow ball

2. Usage:
Due to its unique Al ion form, D406 can selectively adsorb fluoride ions from drinking water. The resin has been pre treated before leaving the factory and can be used directly. The operating flow rate is 10-30m/h. After the resin fails, 2-3BV of 5% Al2 (SO4) 3 can be used to regenerate the resin. The contact time between the regenerant and the resin is about 1 hour. Then wash with clean water until there is no aluminum and reuse it.
6、 D407 and D407-III nitrate selective resins
1. Physical and chemical performance indicators of D407 and D407-III nitrate selective resins

resin	D407	D407-III
Functional groups	quaternary ammonium salt
moisture content%	52 -60	50 -60
Mass exchange volume mmol/g	≧3.0	≧1.6
Volume exchange capacity mmol/ml	≧0.8	≧0.5
Wet apparent density g/ml	0.65 -0.75	0.65 -0.75
Wet true density g/ml	1.05 -1.10	1.05 -1.15
Particle size range （0.4-1.25mm）	≧95%
Effective particle size mm	0.4 -0.7
Transformation expansion rate	/
PH applicable range	≧5
Maximum operating temperature	80℃
Factory ion type	Cl
appearance	Milk white or light yellow ball

2. Scope of use:
2.1. With the eutrophication of environmental water bodies, the content of nitrate and nitrite in water is increasing, which has threatened the safety of drinking water. In addition, perchlorate, as a highly destructive ion, has been severely restricted in drinking water in Europe and America (not exceeding 1mg/l).
2.2. With the development of seawater aquaculture, the impact of seawater quality on cultured organisms has become increasingly important. Timely removal of excess nitrate is an important step in controlling seawater quality.
2.3. D407 and D407-III are a type of quaternary ammonium salt anion exchange resins with special structures. The former can selectively adsorb nitrate and nitrite ion ions from fresh water (drinking water), while the latter can adsorb nitrate and perchlorate ions from fresh water and seawater.
3. The reference conditions for use and regeneration are as follows:

	D407	D407-III
PH applicable range	≧5
Maximum operating temperature	80℃
Operating flow rate	10-20 BV/hr
Regenerant*	8-10% NaCl	8-10%NaCl +2%HCl
Regenerant dosage	2-3BV
Contact time between regenerant and resin	1小时

*The regenerant of D407-III is an acidic brine containing 8-10% NaCl and 2% HCl.
7、 SQ-407 arsenic selective resin
1. Physical and chemical performance indicators of SQ-407 arsenic selective resin

resin	SQ-407
Functional groups	Iron oxide
moisture content%	50 -58
Mass exchange volume mmol/g	/
Volume exchange capacity mmol/ml	0.5
Wet apparent density g/ml	0.73-0.82
Wet true density g/ml	1.20-1.28
Particle size range （0.4-1.25mm）	≧95%
Effective particle size mm	0.4-0.7
Transformation expansion rate	/
PH applicable range	≧
Maximum operating temperature	80℃
Factory ion type	/
appearance	Brick red ball

2. Scope of use:
By utilizing the special force of iron oxides on arsenic, SQ-407 can selectively adsorb arsenic from drinking water, ensuring that the arsenic content in drinking water meets the drinking water standard (not exceeding 10mg/l).
3. The reference conditions for use and regeneration are as follows:
3.1. When using, two columns should be connected in series (the height of the resin in each column should not be less than 800mm), and the operating flow rate should be 10-30m/h. Due to the generally low arsenic content in water (tens of mg/l are common), each operating cycle typically lasts for 3 months, 6 months, or longer.
3.2. When the arsenic content in the effluent exceeds 10mg/l, regenerate the first column. The method is as follows:
3.2.1. Backwashing: The flow rate is 10-15m/h, and the backwashing development rate is controlled to 75-100%. The time is about 10-20 minutes until the effluent is clear and free of impurities;
3.2.2 Make the resin settle naturally, and then adjust the water level in the column to 20-30cm above the resin layer;
3.3.3. Inject 8-10% NaCl with 2-3BV, taking about 1 hour;
3.3.4. Rinse the resin with clean water for approximately 1 hour, using 2-3BV of water;
3.3.5. Inject 3-4% NaOH with 2-3BV, taking approximately 1 hour;
3.3.6. Continue to rinse the resin with clean water at the same flow rate until the pH of the effluent is close to neutral or similar to that of the influent;
3.3.7. Use the original second column as the first column, and use the regenerated original first column as the second column. Once the two columns are connected, they can run.