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CN-122010266-A - Silicon removal material applied to industrial wastewater treatment and use method thereof

CN122010266ACN 122010266 ACN122010266 ACN 122010266ACN-122010266-A

Abstract

The application relates to the technical field of industrial wastewater treatment, and discloses a silicon removal material applied to industrial wastewater treatment and a use method thereof. The silicon removing material comprises 0.5-2% of hydroxypropyl methylcellulose phthalate, 1-4% of sodium citrate, 3-6% of magnesium chloride, 1-3% of polyethylene glycol and the balance of water, wherein the polysilicate type main agent comprises 7-10% of magnesium aluminum polysilicate, 3-5% of polyaluminum chloride, 2-4% of aluminum hydroxide, 0.5-1% of sodium hexametaphosphate, 0.3-0.8% of anionic polyacrylamide and the balance of water. The method improves the removal efficiency of silicon with different forms, widens the applicable temperature range, reduces the aluminum residue and obviously prolongs the RO membrane cleaning period.

Inventors

  • WANG XU
  • HAO QIANYU
  • LI YING
  • ZHAI XUEDONG
  • NIU YUNFENG
  • LI MIN
  • Qiao wenquan
  • HUANG PEIXIN
  • FU QIANG
  • YANG YANHAO
  • YAN XUEYA
  • DAI JINGUO

Assignees

  • 鄂尔多斯市高新水务有限责任公司
  • 鄂尔多斯市安信泰环保科技有限公司

Dates

Publication Date
20260512
Application Date
20260210

Claims (10)

  1. 1. The silicon removing material for industrial wastewater treatment is characterized by comprising a magnesium strengthening auxiliary agent and a polysilicate main agent which are respectively configured; The magnesium strengthening auxiliary comprises, by mass, 0.5-2% of hydroxypropyl methylcellulose phthalate, 1-4% of sodium citrate, 3-6% of magnesium chloride, 1-3% of polyethylene glycol and the balance of water; The polysilicate type main agent comprises, by mass, 7% -10% of magnesium aluminum polysilicate, 3% -5% of polyaluminum chloride, 2% -4% of aluminum hydroxide, 0.5% -1% of sodium hexametaphosphate, 0.3% -0.8% of anionic polyacrylamide and the balance of water.
  2. 2. The silicon removing material for industrial wastewater treatment according to claim 1, wherein the magnesium strengthening additive comprises, by mass, 1% -2% of hydroxypropyl methylcellulose phthalate, 2% -4% of sodium citrate, 4% -6% of magnesium chloride, 1.5% -2.5% of polyethylene glycol and the balance of water.
  3. 3. The silicon removing material for industrial wastewater treatment according to claim 1 or 2, wherein the polysilicate type main agent comprises 8-9.5% by mass of magnesium aluminum polysilicate, 3.5-4.5% by mass of polyaluminum chloride, 2.5-3.5% by mass of aluminum hydroxide, 0.6-0.9% by mass of sodium hexametaphosphate, 0.4-0.7% by mass of anionic polyacrylamide and the balance of water.
  4. 4. The method for removing silicon from industrial wastewater according to claim 1, wherein said magnesium chloride is magnesium chloride hexahydrate or anhydrous magnesium chloride.
  5. 5. The silicon-removing material for industrial wastewater treatment according to claim 1, wherein the weight average molecular weight of the anionic polyacrylamide is 800-1200 ten thousand.
  6. 6. A method for using the silicon-removing material for industrial wastewater treatment according to claim 1, wherein the magnesium-reinforced auxiliary agent is added to the industrial wastewater at intervals of 10-30 min, and the polysilicate type main agent is added to the industrial wastewater.
  7. 7. The method of claim 6, wherein the magnesium reinforcing auxiliary agent and the polysilicate base agent are used in a ratio of 1 (2.5-6) by volume.
  8. 8. The method of claim 6 or 7, wherein the magnesium reinforcing auxiliary agent is added in an amount of 30-50 mL and the polysilicate type main agent is added in an amount of 125-180 mL.
  9. 9. The method of claim 6, wherein the pH of the industrial wastewater is adjusted to 8.5-9.5 after adding the magnesium-reinforced auxiliary agent, and then adding the polysilicate type main agent.
  10. 10. The method of claim 6, wherein the method is suitable for industrial wastewater with a temperature of 20-50 ℃ and a silicon content of 40-120 ppm.

Description

Silicon removal material applied to industrial wastewater treatment and use method thereof Technical Field The application relates to the technical field of industrial wastewater treatment, in particular to a silicon removal material applied to industrial wastewater treatment and a use method thereof. Background The silicon compound in the industrial wastewater mainly exists in two forms of active silicon and colloidal silicon. Silicon compounds are extremely easy to form silica scale in an industrial circulating cooling water system, so that the heat exchange efficiency is seriously affected, and more seriously, when the wastewater containing silicon enters a Reverse Osmosis (RO) membrane system, silicon can be deposited on the surface of the membrane to form insoluble silica scale, so that the membrane flux is drastically reduced. The existing desilication technology mainly comprises a lime softening method, an aluminum salt/ferric salt coagulating sedimentation method, an adsorption method, an ion exchange method and the like, wherein the aluminum salt coagulating sedimentation method has the widest application due to low cost and simple and convenient operation. For example, chinese patent application CN115385433A discloses a composite silicon removing agent for wastewater in the steel industry, which adopts a two-step adding mode of an auxiliary agent LGF-1 (containing cellulose derivatives and organic compounds) and a main agent LGF-2 (containing aluminum salt), the silicon removing rate can reach 90% -94%, and the RO membrane cleaning period is prolonged from 30 days to 65 days. However, the aluminum salt type silicon remover described in CN115385433A still has obvious defects that firstly, the silicon remover mainly depends on chemical precipitation reaction of aluminum ions and active silicon, but has limited capability of removing colloidal silicon with the particle size smaller than 100nm, when high-colloidal silicon content wastewater produced in industries such as photovoltaics, semiconductors and the like is treated, the total silicon removal rate is obviously reduced, the water inlet requirement of RO (reverse osmosis) membranes is difficult to meet, secondly, the silicon removing effect of aluminum salt is obviously influenced by temperature, when the water temperature exceeds 40 ℃, aluminum ions are easily hydrolyzed in advance to form aluminum hydroxide precipitation, the silicon removing efficiency is reduced to about 70 percent from more than 90 percent, so that the silicon remover is difficult to be suitable for high-temperature circulating cooling water treatment in industries such as steel, electric power and the like, thirdly, aluminum salt is required to be excessively added to ensure the silicon removing effect, so that the aluminum residual concentration in the treated water is higher, aluminum and residual silicon forms an aluminum-silicon composite blocking layer on the surface of the RO membranes, the membrane pollution is further prolonged, and the cleaning period of the RO membranes is limited. From technical mechanism analysis, the root of the problems is that a single aluminum salt system lacks an effective adsorption means to colloidal silicon, the linear polymerization structure of the aluminum salt limits the adsorption bridging capacity of the aluminum salt, and meanwhile, the heat stability of the aluminum salt is insufficient, so that the high-temperature performance is reduced. Therefore, development of a novel silicon removal material is urgently needed, not only can the defect of aluminum salt be made up by introducing a metal component with strong adsorption effect on colloidal silicon, but also the adsorption bridging capability can be enhanced by constructing a three-dimensional network polymerization structure, and the heat stability is improved and the aluminum residue is reduced by optimizing the component proportion, so that high-efficiency synergistic removal of silicon with different forms is realized, the applicable temperature range is widened, secondary pollution is reduced, and the service life of the RO membrane is remarkably prolonged. Disclosure of Invention The application provides a silicon removing material applied to industrial wastewater treatment and a use method thereof, which are used for solving the problems of low removal rate of colloidal silicon, poor high-temperature adaptability, high aluminum residue and limited RO membrane protection effect of the traditional aluminum salt silicon removing agent. By introducing a magnesium-aluminum bimetal synergistic mechanism and a three-dimensional network polymerization structure, the removal efficiency of silicon with different forms is improved, the applicable temperature range is widened, the aluminum residue is reduced, and the RO membrane cleaning period is obviously prolonged. In one aspect, the application provides a desilication material applied to industrial wastewater treatment, compris