Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for separating and recovering sodium arsenate and alkali by fractional crystallization method

A technology for separation and recovery of sodium arsenate, which is applied in the field of separation and recovery of sodium arsenate and alkali, can solve the problems of difficult acceptance by manufacturers and high cost of acidification, and achieve the effects of simple equipment, increased concentration energy consumption, and significant environmental benefits

Inactive Publication Date: 2005-03-16
广西华锡集团股份有限公司
View PDF0 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The water immersion-acidification precipitation method is the same as the water immersion-acidification distillation method, but there is a high cost of acidification, and the output of arsenic sulfide is only an intermediate product, which needs further treatment to form a product
Therefore, it is difficult for manufacturers to accept this law
[0010] Although the water immersion-reduction precipitation method has made some progress, it still needs to add additives such as reducing agents to add Na 2 S precipitates, and arsenic sulfide needs transformation treatment to form products, so this method has not yet been applied industrially

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for separating and recovering sodium arsenate and alkali by fractional crystallization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: 2 liters of As 5+ 32.46g / l, containing Na + 92.22g / l arsenic-alkali slag water immersion solution, concentrated at a temperature of 40-100°C to the end point of one-step crystallization, the solution contains As 5+ 65.32g / l, containing Na +203.00g / l, then cool the liquid to room temperature or below room temperature, let it stand for crystallization for 2 hours, and filter it to obtain Na 3 AsO 4 72.94%, containing NaOH1.34%, containing Na 2 CO 3 0.29%, containing H 2 O25.44% sodium arsenate crystal 220g. The direct recovery rate of As is 89.13%, and the recovery rate is 97.60%. Then put the one-step crystallization mother liquor in the concentrator, concentrate at 40-100°C until the second-step crystallization reaches a water content of 15-30%, then discharge it from the concentrator, put it into the furnace for calcination, and obtain 220 g of calcined products, containing NaOH82. 16%, Na 2 CO 3 10.27%, containing Na 3 AsO 4 6.93%. Contains H ...

Embodiment 2

[0028] Embodiment 2: 2 liters containing As 5+ 38.22g / l, containing Na + 93.22g / l arsenic-alkali slag water immersion solution, concentrated at a temperature of 40-100°C to the end point of one-step crystallization, the solution contains As 5+ 62.36g / l, containing Na + 196.30g / l, then cool the liquid to room temperature or below room temperature, let it stand for crystallization for 2 hours, and filter it to obtain Na 3 AsO 4 77.65%, containing NaOH1.36%, Na 2 CO 3 1.06%, containing H 2 O19.93% sodium arsenate crystals 246g. The direct recovery rate of As is 90.11%, and the recovery rate is 96.07%. Then put the one-step crystallization mother liquor in the concentrator, concentrate at 40-100°C until the second-step crystallization reaches a water content of 15-30%, then discharge it from the concentrator, put it into the furnace for calcination, and obtain 209g of calcined product, containing NaOH83. 49%, Na 2 CO 3 8.96%, containing Na 3 AsO 4 6.05%. Contains H ...

Embodiment 3

[0029] Embodiment 3: 4 liters containing As 5+ 32.39g / l, containing Na + 88.32g / l arsenic-alkali slag water immersion solution, concentrated at a temperature of 40-100°C to the end point of one-step crystallization, the solution contains As 5+ 69.33g / l, containing Na + 190.31g / l, then cool the liquid to room temperature or below room temperature, let it stand for crystallization for 2 hours, and filter it to obtain Na 3 AsO 4 63.81%, containing NaOH6.83%, Na 2 CO 3 0.31%, containing H 2 O2 9.05% sodium arsenate crystal 501g. The direct recovery rate of As is 88.98%, and the recovery rate is 97.22%. Then put the one-step crystallization mother liquor in the concentration equipment, concentrate at 40-100°C until the second-step crystallization product reaches a water content of 15-30%, then discharge it from the concentration equipment, put it into the furnace for calcination, and obtain 403g of calcined product, containing NaOH79. 11%, Na 2 CO 3 12.36%, containing Na ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for separating and recovering sodium arsenate and alkali by fractional crystallization method which consists of, condensing the arsenic alkaline residue infusion, cooling down to below room temperature, stewing for 2 hrs, filtering to obtain sodium arsenate, concentrating the crystallization mother liquor, and calcining the crystallized product.

Description

(1) Technical field [0001] The invention relates to a method for separating and recovering sodium arsenate and alkali, in particular to a method for separating and recovering sodium arsenate and alkali from the water immersion solution of arsenic-alkali slag by a fractional crystallization method. (2) Background technology [0002] Arsenic is dispersed in most valuable minerals, so arsenic is removed as an impurity element during the refining or product processing of many valuable elements. The most commonly used method for removing arsenic is adding alkali to oxidize and remove arsenic. The main components of the arsenic-alkali slag produced by this method are alkali, arsenic and other valuable elements. Arsenic is a highly toxic element and must be treated. In addition, other valuable components in arsenic-alkali slag have high recovery value and must be recovered. The general method of recovering arsenic and alkali is to separate the arsenic and ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01D1/30C01D7/24C01D13/00C01G28/02
Inventor 韦元基韦健陆永壮宾仕华韦明芳李仕庆廖春图苏家红甘平谢永彬张玥婷覃素权陈家荣雷黎明
Owner 广西华锡集团股份有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com