Crystallization Control in Solution Mining

Crystallization Modifiers for Solution Mining

RD Chemical manufactures additives for crystallization liquors to reduce, and make more uniform, crystals from liquors. Each application is different, and very much depends on what is being crystallized, and temperature and concentrations, so each application requires a slightly different formula. Contact RD Chemical with details of your application, and we will optimize a product for your unique end use.

Stainless Steel without colored oxide

Process Line for ChemPolish™ of 300 Series Stainless Steel without colored oxide

Step	Process Line	Concentration & Temperature	Time	Heater Equipment	Process Equipment	Exhaust Required
1.	Alkaline Clean: Spray MicroClean™ CuL (RD-19)	25% by volume 120-170°F (50-75°C)	2-4 Min.	SS or Quartz - OK Teflon - OK Titanium - OK	SS - OK PVC - OK PP - OK	Yes
OR
1A.	Alkaline Clean Soak tank MicroClean CuLX™ (RD-68)	25% by volume 120-170°F (50-75°C)		See above		No
2.	Cold Rinses, cascaded can usuallly be sent to drain with only pH adjustment, if needed
3.	ChemPolish™ S (spray) (RDX-817)	100% 175°-180° F (80-85° C)	60-90 Seconds	Teflon or Quartz – OK Titanium - OK	PVC - No PP - OK	Yes
OR
3A.	ChemPolish™ (tank) (RD-05)	100% 175°-1800° F (80°-850° C)	60-120 Seconds	Teflon or Quartz - OK Titanium - OK	PVC – No	Yes
4.	Cold Rinses, Cascaded, (May need to be treated for pH adjustment, and Nickel removal)
5.	(Treatment with 50% commercial 42° Be’ Nitric acid may be required if SS is high carbon, and a black smut is generated. This is room temp, ~30 seconds)
6.	Further cold rinse, if required.
7.	Dry, Turbine blower preferred, if material can handle force.

Stainless Steel with colored scale

Recommended Process Line for ChemPolish™ for 300 Series SS with Colored Scale

Step	Process Line	Concentration & Temperature	Time	Heater Equipment	Process Equipment	Exhaust Required
1.	Alkaline Clean: MicroClean™ CuLX (RD-68)	25% by volume 130°-180°F (45°-80°C)	5-10 Minutes	SS or Quartz - OK Teflon - OK Titanium - OK	SS - OK PVC - OK at lower temps PP - OK	No
2.	Cold Rinses, cascaded. Tap Water OK Can usually be sent to drain with only pH adjustment, if needed
3.	Alkaline Descale™ (RDZ-1734)	50% by volume Part A + Part B 180°-200° F (80°-90° C)	60-90 Minutes	Teflon - No Titanium - OK Quartz - OK	PVC - No SS - OK PP - OK	Yes 180° F Max w/reinforcement
4.	Cold Rinses, cascaded Tap Water OK, Can usually be sent to drain with only pH adjustment, if needed
5.	Descale Remover™ (RDZ-1735)	100% by volume 70°- 90°F (20°-30°C)	30-60 Seconds	Teflon - OK Titanium - No Quartz - OK	PVC – OK PE - OK PP – OK	Yes
6.	Cold Rinses, Cascaded. Tap water OK (May need to be treated for Nickel and Chromium removal & pH adjustment).
7.	ChemPolish™ (RD-5)	100% by volume 175°-185° F (78°-82° C)	3-8 Minutes	Titanium - ?? Quartz - OK	CPVC - OK PP - OK PVDF - OK	Yes
8.	Cold Rinses, cascaded. Deionized Water for best results. (Will need to be treated for Nickel and Chromium removal & pH adjustment)
9.	Nitric Acid Desmut (Needed only when SS has significant Carbon Content)	50% by Volume Commercial 42° Be’ Nitric Acid Unheated	30-60 Seconds	DNA	PE - OK PP - OK PVC - OK SS - OK	No
10.	Cold Rinses, cascaded Deionized Water for best results (Can usually be sent to drain with only pH adjust)