CN1310838C

CN1310838C - Process of preparing sodium cyanide and lead sulfide for gold ore sorting from waste sodium cyaide desulfurizing dreg

Info

Publication number: CN1310838C
Application number: CNB2005100565826A
Authority: CN
Inventors: 嵇忠平
Original assignee: 嵇忠平
Current assignee: Anqing loyal Environmental Protection Technology Co., Ltd.
Priority date: 2005-03-29
Filing date: 2005-03-29
Publication date: 2007-04-18
Anticipated expiration: 2025-03-29
Also published as: CN1673082A

Abstract

The present invention discloses a process for preparing sodium cyanide and lead sulfide for gold ore sorting from waste sodium cyanide desulfurizing dregs, which utilizes the different physicochemical characteristics of each component in waste sodium cyanide desulfurizing dregs, particularly the difference of solubility in water, and uses water as a medium to cause sodium cyanide to completely disengage and dissolve in the water to form a liquid cyanogen product by a series of separation measures and extraction measures, and the residual waste dregs are filtered and then become a lead ore product. The present invention has the advantages of compact and effective production process, no output of the three wastes, no pollution, coincidence of the requirements of environmental protection, less investment, high output, thorough resource utilization of wastes, etc. Moreover, the present invention enhances economical benefits and social benefits and is suitable for small and medium-sized businesses or fine chemical industry businesses to invest for building factories.

Description

The method of desuifurized system gold extracting sodium cyanide of sodium cyanide and lead sulfide

(1) technical field:

The present invention relates to the sodium cyanide refuse processing method, be specifically related to the method for desuifurized system gold extracting sodium cyanide of a kind of sodium cyanide and lead sulfide.

(2) background technology:

At present, domestic Sodium Cyanide Production producer mainly contains dozens of producers such as Tianjin Chinaization oxygen installation, calcium carbide factory of Ji Hua company, chemical plant, Wusong, Shanghai, Suzhou, Jiangsu fertilizer plant and Anqing dawn chemical plant, main method has several methods such as light oil cracking method, vinyl cyanide by-product method, iS-One method, ammonia sodium method, cyanogen solution method, major part all can produce the sodium cyanide waste, processing mode mainly contains four kinds: the one, and chemical decomposition method, the 2nd, pressurizing hydrolysis, the 3rd, bury method deeply, the 4th, burning method.This several method all exist processing not thoroughly, secondary pollution seriously reaches problems such as processing costs height.About the exploitation and the applied research aspect of the desuifurized resource technology of sodium cyanide, there is the document of certain degree of correlation few in the domestic literature." Chinese environmental protection industry " 2004 the 9th phases, 37 pages of articles of publishing Xue Fulian " recycling of sodium cyanide filter residue ", when the author has introduced Liaozhong County, Liaoyang City chemical general factory employing ammonia sodium method production sodium cyanide, discharge and contain poisonous sodium cyanide (about 30%) filter residue in a large number, in order to utilize this poisonous rubbish, through repeatedly practising, made important chemical material-yellow prussiate of soda, and situation about having put into production.87～88 pages of " Shanxi coal colleges for training managerial personnel journal " the 1st phases in 2004 have been published Guo's progressive article " sodium cyanide factory contains cyanogen waste residue treatment technology and inquires into ", introduced at the cyanogen waste residue that contains that produces in the sodium cyanide series product production process and stacked for a long time, the problem bigger to environmental hazard, Lingchuan, Shanxi Province chemical general factory will contain cyanogen waste residue and coal, tackiness agent and unslaked lime by a certain percentage mixing make ball and in special incinerator, burn, can decompose prussiate wherein well, reduce its harm, and incineration residue is brickmaking after crushed, has realized utilization of waste material.But the desuifurized or relevant separation and Extraction of passing through of domestic relevant sodium cyanide makes the desuifurized Study on Process of selecting golden special-purpose sodium cyanide and lead ore product that changes into of sodium cyanide, and then not seeing has bibliographical information.

(3) summary of the invention:

The object of the present invention is to provide the method for desuifurized system gold extracting sodium cyanide of a kind of sodium cyanide and lead sulfide, it is desuifurized that this method produces when producing sodium cyanide at light oil cracking method, treated becoming selects golden special-purpose sodium cyanide and higher-grade lead ore, make sodium cyanide desuifurized fully by resource utilization, its technology is simple, reduced investment, pollution-free emitting.

For achieving the above object, the technical solution adopted in the present invention is: the method for desuifurized system gold extracting sodium cyanide of a kind of sodium cyanide and lead sulfide, and production craft step is as follows:

(1) adding is equivalent to waste residue weight 0.5-1 clear water doubly in the desuifurized raw material of the sodium cyanide of light oil cracking method production, stirs after 20 minutes-1 hour and leaves standstill more than 12 hours, and supernatant liquid is filtered post analysis NaCN content;

(2) upwards add again in the throw out of a step and be equivalent to waste residue weight 0.5-1 clear water doubly, stir after 20 minutes-1 hour and leave standstill more than 12 hours, supernatant liquid is filtered post analysis NaCN content;

(3) repeat above-mentioned (1), (2) step 2-3 time;

(4) collect the lead sulfide residue, suction filtration flushing and collection filtrate analysis are lower than 0.5PPm until NaCN content repeatedly;

(5) get new raw material repeat above process, change clear water that added last time the filtrate of collected NaCN concentration＜15% into, the putting together of NaCN concentration＞15% as the NaCN finished product, the getting ready time to wash of NaCN concentration＜15% recycles.

After adopting technique scheme, the present invention utilize sodium cyanide desuifurized in the different physics-chem characteristic of each composition difference of solubleness in water particularly, with water as medium, by a series of separation and Extraction measures, make sodium cyanide break away from the water-soluble liquid cyanogen product that becomes fully, become the lead ore product after remaining waste residue filter is done.Concise production process of the present invention is effective, make the thorough resource utilization of waste, and pilot process does not have three wastes output, compliance with environmental protection requirements.

(4) description of drawings:

Fig. 1 is the technological process of production figure of the method for desuifurized system gold extracting sodium cyanide of sodium cyanide of the present invention and lead sulfide.

(5) embodiment:

The present invention is further detailed explanation below in conjunction with drawings and Examples.

Embodiment

1, raw material:

Sodium cyanide is desuifurized, takes from desuifurized that dawn chemical plant, Anqing produces when light oil cracking method is produced sodium cyanide, and character sees Table 1:

Form	NaCN％	NaOH％	Na ₂CO ₃％	PbS％	H ₂O％	Other %
Form	NaCN％	NaOH％	Na ₂CO ₃％	PbS％	H ₂O％	Other %	The black dope	25.82	0.65	0.41	21.7	49.4	2.02

2, experimentation:

(1) add raw material 400g in the beaker, add deionized water 400g stirring and left standstill 12 hours after 1 hour, it is 17.8% that supernatant liquid is filtered post analysis NaCN content;

(2) upwards add deionized water 400g again in the throw out of a step, stir and left standstill 12 hours after 1 hour, it is 8.6% that supernatant liquid is filtered post analysis NaCN content;

(3) repeat above-mentioned (1), (2) step 3 time;

(4) the lead sulfide residue is washed till sand core funnel in the cup, and funnel is connected with filter flask, vacuum pump in advance, washes precipitation and collection filtrate analysis in the funnel repeatedly, until NaCN content＜0.5PPm, reaches till the environmental requirement;

(5) get new raw material repeat above process, change deionized water that added last time the filtrate of collected NaCN concentration＜15% into, the putting together of NaCN concentration＞15% as the NaCN finished product, the getting ready time to wash of NaCN concentration＜15% recycles.

3, experiment conclusion:

Sodium cyanide is desuifurized as a result becomes liquid sodium cyanide and two kinds of products of lead sulfide after treatment, and character sees Table 2, table 3:

Table 2

NaCN％	NaOH％	Na ₂CO ₃％	H ₂O％	Other %
NaCN％	NaOH％	Na ₂CO ₃％	H ₂O％	Other %	15.78	0.29	0.21	82.66	1.06

Table 3

PbS％	H ₂O％	Other %
PbS％	H ₂O％	Other %	75.49	22.83	1.64

Become liquid sodium cyanide because sodium cyanide is desuifurized after method of the present invention is handled, it is required that concentration is higher than the choosing gold, can directly pay gold mine and use; Lead sulfide content is done mineral products and is sold greater than the lead ore product.

Claims

1, the method for desuifurized system gold extracting sodium cyanide of a kind of sodium cyanide and lead sulfide, production craft step is as follows:

(3) repeat above-mentioned (1), (2) step 2-3 time;