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 manu

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

Example Embodiment

[0027] Example 1: 2 liters containing As 5+ 32.46g / l, with Na + 92.22g / l arsenic alkali residue water leaching solution, concentrated to the end point of one-step crystallization at 40~100℃. The solution contains As 5+ 65.32g / l, with Na +203.00g / l, then cool this liquid to room temperature or below, stand for crystallization for 2 hours, and filter it to obtain Na containing 3 AsO 4 72.94%, containing NaOH1.34%, containing Na 2 CO 3 0.29%, with H 2 O25.44% sodium arsenate crystal 220g. The direct yield of As is 89.13%, and the recovery rate is 97.60%. Then, the one-step crystallization mother liquor was placed in the concentration equipment, and concentrated to the second-step crystallized product at a temperature of 40 to 100 ° C to reach 15 to 30% water content, which was to be discharged from the concentration equipment, and calcined in a furnace to obtain 220 g of a calcined product, containing 82.2 g of NaOH. 16%, Na 2 CO 3 10.27% with Na 3 AsO 4 6.93%. Conta...

Example Embodiment

[0028] Example 2: 2 liters containing As 5+ 38.22g / l, with Na + 93.22g / l arsenic alkali residue water leaching solution, concentrated at 40~100℃ to the end point of one-step crystallization solution containing As 5+ 62.36g / l, with Na + 196.30g / l, then cool this liquid to room temperature or below, stand for 2 hours to crystallize, and filter it to obtain Na-containing 3 AsO 4 77.65%, with NaOH1.36%, Na 2 CO 3 1.06%, with H 2 O19.93% sodium arsenate crystal 246g. The direct yield of As is 90.11%, and the recovery rate is 96.07%. Then, the one-step crystallization mother liquor was placed in the concentration equipment, and concentrated to the second-step crystallized material at a temperature of 40 to 100° C. to reach 15 to 30% water content, that is, it was discharged from the concentration equipment, and calcined in a furnace to obtain 209 g of a calcined product, containing 83.3 g of NaOH. 49%, Na 2 CO 3 8.96% with Na 3 AsO 4 6.05%. Contains H 2 O 1.51%, the d...

Example Embodiment

[0029] Example 3: 4 liters containing As 5+ 32.39g / l, with Na + 88.32g / l arsenic alkali residue water leaching solution, concentrated at 40~100℃ to the end point of one-step crystallization solution containing As 5+ 69.33g / l, with Na + 190.31g / l, then cool the liquid to room temperature or below, stand for crystallization for 2 hours, and filter it to obtain Na containing 3 AsO 4 63.81%, with NaOH6.83%, Na 2 CO 3 0.31%, with H 2 O29.05% sodium arsenate crystal 501g. The direct yield of As is 88.98%, and the recovery rate is 97.22%. Then, the one-step crystallization mother liquor was placed in the concentration equipment, and concentrated to the second-step crystallized product at a temperature of 40 to 100 ° C to reach 15 to 30% water content, that is, it was discharged from the concentration equipment, and calcined in a furnace to obtain 403 g of a calcined product, containing 79.9 g of NaOH. 11%, Na 2 CO 3 12.36% with Na 3 AsO 4 7.35%. Contains H 2 O 1.18%, th...

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 Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap